Method, apparatus and system for transmitting and receiving an uplink shared channel in a wireless communication system

Abstract

To provide a method for a terminal to transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system.SOLUTION: A terminal may receive configuration information for PUSCH transmission from a base station and may receive a physical downlink control channel (PDCCH) for scheduling repeated transmission of the PUSCH. The terminal may then determine one or more symbols that are invalid for repeated transmission of the PUSCH and may repeatedly transmit the PUSCH with remaining symbols other than the determined symbols.SELECTED DRAWING: Figure 29

Description

[Technical Field]

[0001] The present invention relates to a wireless communication system, and more particularly to a method for transmitting and receiving a physical uplink shared channel (PUSCH) in a wireless communication system. [Background technology]

[0002] 3GPP LTE(-A) defines uplink / downlink physical channels for transmitting physical layer signals, such as the Physical Uplink Shared Channel (PUSCH) for transmitting uplink data, the Physical Uplink Control Channel (PUCCH) for transmitting control signals, and the Physical Random Access Channel (PRACH). Also, the downlink includes the Physical Downlink Shared Channel (PDSCH) for transmitting data, the Physical Control Format Indicator Channel (PCFICH), the Physical Downlink Control Channel (PDCCH), and the Physical Hybrid ARQ Indicator Channel (PHICH) for transmitting L1 / L2 control signals.

[0003] Among these channels, the downlink control channel (PDCCH / EPDCCH) is a channel through which a base station transmits uplink / downlink scheduling allocation control information, uplink transmission power control information, and other control information to one or more terminals. Because the base station has limitations on the resources that can be used for PDCCHs that can be transmitted at one time, it is not possible to assign different resources to each terminal, and the resources must be shared to transmit control information to any terminal. For example, in 3GPP LTE(-A), four resource elements (REs) are bundled to form a resource element group (REG), which then forms nine control channel elements (CCEs). The resources that can be transmitted by combining one or more CCEs are notified to the terminal, and many terminals share and use the CCEs. Here, the number of CCEs that can be combined is called the CCE aggregation level, and the resources to which CCEs are allocated according to the possible CCE aggregation levels are called search spaces. The search space can be a common search space defined for each base station, or a terminal-specific or UE-specific search space defined for each terminal. The UE performs decoding for all possible CCE combinations in the search space and determines whether the PDCCH corresponds to its own PDCCH based on the user equipment (UE) identifier included in the PDCCH. Therefore, such UE operation inevitably takes a long time to decode the PDCCH and consumes a lot of energy.

[0004] Following the commercialization of the 4G communication system, efforts are underway to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic. For this reason, 5G or pre-5G communication systems are referred to as beyond-4G network (Beyond 4G Network) or post-LTE (Post-LTE) systems. To achieve high data transmission rates, implementation of 5G communication systems in ultra-high frequency (mmWave) bands (e.g., the 60 GHz band) is being considered. To mitigate propagation path loss and increase propagation distance in ultra-high frequency bands, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna technologies are being discussed for 5G communication systems. In addition, to improve the system network, technologies such as advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, moving networks, cooperative communication, CoMP (Coordinated Multi-Points), and receiver interference cancellation are being developed for the 5G communication system.Other advanced coding modulation (ACM) methods being developed for 5G systems include Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), as well as advanced access technologies such as Filter Bank Multi Carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[0005] Meanwhile, the Internet, a human-centered network where humans generate and consume information, is evolving into the IoT (Internet of Things) network, which exchanges and processes information among distributed components such as objects. IoE (Internet of Everything) technology, which combines big data processing technology through connections with cloud servers, is also emerging. To realize the IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, research has focused on sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) technologies for connecting objects. In an IoT environment, intelligent IT (internet technology) services are provided that collect and analyze data generated by connected objects and create new value in human life. Through the integration and convergence of traditional IT technology and various industries, the IoT is being applied to areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0006] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine, and MTC are being implemented using 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access networks (cloud RAN), the big data processing technology mentioned above, is also an example of the fusion of 5G and IoT technologies. Generally, mobile communication systems were developed to provide voice services while ensuring user activity.

[0007] Generally, mobile communication systems have been developed to provide voice services while ensuring user activity. However, mobile communication systems have gradually expanded their service areas to include not only voice but also data services, and have now evolved to the point where they can provide high-speed data services. However, due to resource shortages in currently available mobile communication systems and users' demands for higher speed services, a more advanced mobile communication system is required.

[0008] As mentioned above, future 5G technology will require lower latency data transmission with the emergence of new applications such as real-time control and tactile internet, and the required latency for 5G data is expected to drop to 1 ms. 5G aims to provide data latency that is approximately 10 times lower than conventional standards. To solve this problem, 5G is expected to propose a communication system that uses mini-slots, which have an even shorter TTI period (e.g., 0.2 ms) than conventional slots (or subframes).

[0009] Rel-16 enhanced URLLC (eURLLC) discusses various technologies to provide lower latency and higher reliability. Among them, to provide lower latency, it supports transmission of an uplink control channel containing two or more HARQ-ACKs in one slot. A terminal can ensure lower latency by transmitting HARQ-ACKs as quickly as possible in response to successful reception of a downlink shared channel. Summary of the Invention [Problem to be solved by the invention]

[0010] An object of one embodiment of the present invention is to provide a method for a terminal to repeatedly transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system, and a terminal therefor. [Means for solving the problem]

[0011] A method for a terminal transmitting an uplink shared channel (PUSCH) to a base station in a wireless communication system includes the steps of: receiving configuration information for PUSCH transmission from the base station, the configuration information including resource information related to a control resource set used for an initial access procedure; receiving a physical downlink control channel (PDCCH) for scheduling repeated transmission of the PUSCH; determining one or more invalid symbols for the repeated transmission of the PUSCH; and repeatedly transmitting the PUSCH using at least one symbol scheduled by the PDCCH, excluding the invalid symbols, wherein the one or more invalid symbols include symbols indicated by the resource information related to the control resource set used for the initial access procedure.

[0012] In addition, in the present invention, the configuration information is indicated by the PBCH, and the control resource set has an index value of 0.

[0013] In addition, in the present invention, the one or more invalid symbols further include symbols designated as semi-static downlink symbols for downlink reception in a cell where repeated transmission of the PUSCH is performed, and symbols for receiving a synchronization signal (SS) and / or a physical broadcast channel (PBCH).

[0014] Also, in the present invention, the semi-static downlink symbols and the symbols for receiving the PBCH are indicated by the configuration information.

[0015] In addition, in the present invention, when the terminal supports only half duplex mode, the one or more invalid symbols further include symbols designated for reception of downlink channels and signals in a cell different from the cell in which repeated transmission of the PUSCH is performed and / or symbols designated as semi-static downlink symbols.

[0016] In addition, in the present invention, the one or more invalid symbols further include a gap symbol, and the gap symbol is at least one symbol located after a symbol designated for downlink reception.

[0017] In addition, in the present invention, the subcarrier spacing of the gap symbol is a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell to which the gap symbol is applied for repeated transmission of the PUSCH.

[0018] In addition, in the present invention, the symbols designated for downlink reception are semi-static downlink symbols, symbols for receiving SSB / PBCH blocks, or symbols included in the control resource set.

[0019] In addition, in the present invention, when a symbol for repeated transmission of the PUSCH overlaps with a symbol for transmitting a physical uplink control channel (PUCCH) by at least one symbol, the PUSCH and uplink control information (UCI) of the PUCCH are multiplexed and transmitted in a first symbol set among at least one symbol set including the at least one symbol, and the at least one symbol set is a resource for repeated transmission of the PUSCH.

[0020] Also, in the present invention, the PUSCH transmitted in the first symbol set satisfies the processing time for multiplexing between the UCIs.

[0021] In addition, in the present invention, the PUSCH and the UCI are multiplexed only when the number of symbols for repeatedly transmitting the PUSCH in each slot exceeds one.

[0022] The present invention also provides a terminal including: a communication module; and a processor that controls the communication module, wherein the processor receives configuration information for PUSCH transmission from a base station, the configuration information including resource information related to a control resource set used for an initial access procedure; receives a physical downlink control channel (PDCCH) for scheduling repeated transmission of the PUSCH; determines one or more invalid symbols for the repeated transmission of the PUSCH; and repeatedly transmits the PUSCH using at least one symbol scheduled by the PDCCH excluding the invalid symbol, wherein the one or more invalid symbols include symbols indicated by the resource information related to the control resource set used for the initial access procedure. [Effects of the Invention]

[0023] According to the method in which a terminal repeatedly transmits a PUSCH to a base station in the wireless communication system according to one embodiment of the present invention, the terminal repeatedly transmits a PUSCH to a base station as quickly as possible, thereby achieving the target performance of a 5G wireless communication system that aims to provide a service with low latency and high reliability.

[0024] The effects obtained from the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a wireless communication system. [Figure 2] 1 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3]1 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channels. [Figure 4] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5] FIG. 1 illustrates a procedure for control information and control channel transmission in a 3GPP NR system. [Figure 6] A diagram showing a CORESET in which PDCCH is transmitted in a 3GPP NR system. [Figure 7] A diagram showing a method for setting a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 8 is a conceptual diagram illustrating carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining terminal carrier communication and multi-carrier communication. [Figure 10] A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 11] 2A and 2B are block diagrams showing the configurations of a terminal and a base station according to an embodiment of the present invention. [Figure 12] 1 is a flowchart illustrating an example of transmitting and receiving a physical uplink shared channel (PUSCH) according to an embodiment of the present invention. [Figure 13] FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 14] FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 15] FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 16]FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 17] FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 18] FIG. 10 is a diagram illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions. [Figure 19] FIG. 10 is a diagram illustrating an example of a slot format for PUSCH repeated transmission according to one embodiment of the present invention. [Figure 20] FIG. 10 is a diagram illustrating an example of a slot format for PUSCH repeated transmission according to one embodiment of the present invention. [Figure 21] FIG. 10 is a diagram illustrating an example of a slot format for PUSCH repeated transmission according to one embodiment of the present invention. [Figure 22] FIG. 10 is a diagram illustrating an example of a slot format for PUSCH repeated transmission according to one embodiment of the present invention. [Figure 23] FIG. 10 is a diagram illustrating yet another example of symbols for which PUSCH repetitive transmission is not possible according to an embodiment of the present invention. [Figure 24] FIG. 10 is a diagram illustrating yet another example of symbols for which PUSCH repetitive transmission is not possible according to an embodiment of the present invention. [Figure 25] 1 illustrates an example of a method for determining invalid symbols according to an embodiment of the present invention. [Figure 26] 10 illustrates an example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention. [Figure 27] 10 illustrates yet another example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention. [Figure 28] 10 illustrates yet another example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention. [Figure 29]10 is a flowchart illustrating an example of a method for a terminal to repeatedly transmit a PUSCH according to an embodiment of the present invention. [Figure 30] 10 is a flowchart illustrating an example of a method for a base station to repeatedly receive a PUSCH from a terminal according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The terms used in this specification are generally used as widely as possible, taking into consideration the functions of the present invention. However, these may vary depending on the intentions of those skilled in the art, practice, or the emergence of new technologies. In addition, in certain cases, the applicant may arbitrarily select terms. In such cases, the meaning of the terms will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be analyzed based on the substantive meaning of the terms and the overall content of this specification, rather than simply the names of the terms.

[0027] Throughout this specification, when a component is said to be "connected" to another component, this includes not only "directly connected" but also "electrically connected" through other components in between. Furthermore, when a component is said to "comprise" a specific component, this does not mean excluding the other component, but also means including the other component, unless otherwise specified to the contrary. In addition, limitations such as "more than" or "less than" based on a specific threshold may be appropriately replaced with "more than" or "less than," respectively, depending on the embodiment.

[0028] The following technologies are used in various wireless access systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA is implemented in radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented in radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA is implemented in radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, and E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP LTE (Long term evolution) is a 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 eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. For clarity of explanation, the following description will focus on 3GPP NR, but the technical concept of the present invention is not limited thereto.

[0029] Unless otherwise specified herein, the base station may include a next generation node B (gNB) defined in 3GPP NR. Also, unless otherwise specified, the terminal may include a user equipment (UE). Hereinafter, to facilitate understanding of the description, each content will be described as a separate embodiment, but each embodiment may be used in combination with each other. In this disclosure, "configuring" a terminal may mean configuration by a base station. Specifically, the base station may transmit a channel or a signal to the terminal to configure the operation of the terminal or parameter values ​​used in the wireless communication system.

[0030] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a radio communication system.

[0031] Referring to FIG. 1, a radio frame used in a 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100)*Tc). Each radio frame consists of 10 equally sized subframes (SF). Here, Δfmax=480*103 Hz, Nf=4096, Tc=1 / (Δfref*Nf,ref), Δfref=15*103 Hz, and Nf,ref=2048. The 10 subframes in a frame are numbered 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 a 3GPP NR system is 15*2 μkHz. μ is the subcarrier spacing configuration factor and has values ​​from 0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. A 1 ms long subframe consists of 2μ slots, each of which is 2-μms long. The 2μ slots in one subframe are numbered from 0 to 2μ-1. The slots in one radio frame are numbered from 0 to 10*2μ-1. Time resources are divided by at least one of the radio frame number (also called radio frame index), subframe number (also called subframe index), and slot number (or slot index).

[0032] 2 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system, particularly illustrating a resource grid structure in a 3GPP NR system.

[0033] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes multiple OFDM symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also refers to one symbol interval. Unless otherwise specified, an OFDM symbol is simply referred to as a symbol. Hereinafter, the term "symbol" includes OFDM symbols, SC-FDMA symbols, DFTs-OFDM symbols, etc. Referring to FIG. 2, a signal transmitted from each slot is represented by a resource grid consisting of Nsize, μgrid, x*NRBSC subcarriers, and Nslotsymb OFDM symbols. Here, x=DL for the downlink resource grid and x=UL for the uplink resource grid. Nsize, μgrid, and x denote the number of resource blocks (RBs) according to the subcarrier spacing factor μ (x is DL or UL), and Nslotsymb denotes the number of OFDM symbols in a slot. NRBSC is the number of subcarriers constituting one RB, and NRBSC=12. Depending on the multiple access method, the OFDM symbol is called a cyclic prefix OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-S-OFDM) symbol.

[0034] The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, a normal CP includes 14 OFDM symbols, while an extended CP includes 12 OFDM symbols. In a specific embodiment, the extended CP is used only with a subcarrier spacing of 60 kHz. For convenience of explanation, FIG. 2 illustrates a case where one slot consists of 14 OFDM symbols. However, the present invention is equally applicable to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, and x*NRBSC subcarriers in the frequency domain. Subcarriers are classified into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0035] One RB is defined by NRBSC (e.g., 12) consecutive subcarriers in the frequency domain. Incidentally, a resource consisting of one OFDM symbol and one subcarrier is called a resource element (RE) or 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 ranging from 0 to Nsize, μgrid, x*NRBSC-1 in the frequency domain, and l is an index ranging from 0 to Nslotsymb-1 in the time domain.

[0036] In order for a terminal to receive a signal from a base station or transmit a base station signal, the time / frequency synchronization of the terminal must be aligned with the time / frequency synchronization of the base station, because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters required to demodulate DL signals and transmit UL signals at the correct time.

[0037] Each symbol in a radio frame operating in time division duplex (TDD) or 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 frequency division duplex (FDD) or paired spectrum consists of downlink symbols or flexible symbols, and a radio frame operating on an uplink carrier consists of uplink symbols or flexible symbols. A downlink symbol allows downlink transmission but not uplink transmission, and an uplink symbol allows uplink transmission but not downlink transmission. Whether a flexible symbol is used for downlink or uplink is determined depending on the signal.

[0038] Information about the type of each symbol, i.e., information indicating any one of downlink symbols, uplink symbols, and flexible symbols, is formed by a cell-specific (or common) RRC signal. The information about each symbol type is additionally formed by a 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 in 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 in the slot immediately preceding the slot having only uplink symbols. Here, symbols that are not configured as either uplink or downlink symbols are flexible symbols.

[0039] 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 a downlink symbol or an uplink symbol consisting of the cell-specific RRC signal into another symbol type. The per-UE RRC signal signals, for each slot, the number of downlink symbols among the Nslotsymb symbols of the slot and the number of uplink symbols among the Nslotsymb symbols of the 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, a symbol that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0040] The type of symbol configured by the RRC signal as described above can be called a semi-static DL / UL configuration. In the semi-static DL / UL configuration configured by the RRC signal as described above, the flexible symbol may be indicated as a downlink symbol, an uplink symbol, or a flexible symbol by means of the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, a downlink symbol or an uplink symbol configured by the RRC signal is not changed into another symbol type. Table 1 exemplifies the dynamic SFI that the base station can indicate to the UE.

[0041] 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 physical channel.

[0042] When a terminal is powered on or newly enters a cell, the terminal performs an initial cell search (S101). Specifically, the terminal synchronizes with a base station during the initial cell search. To do this, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell index. Next, the terminal receives a physical broadcast channel from the base station to acquire broadcast information within the cell.

[0043] After completing the initial cell search, the terminal receives a physical downlink shared channel (PDSCH) via a physical downlink control channel (PDCCH) and information carried on the PDCCH to acquire more detailed system information than that acquired through the initial cell search (S102). Here, the system information transmitted to the terminal is cell-common system information for the terminal to operate correctly in a physical layer in Radio Resource Control (RRC), and is called remaining system information or system information block (SIB) 1.

[0044] When a terminal first connects to a base station or when there are no radio resources for signal transmission (when the terminal is in RRC_IDLE mode), the terminal can perform a random access procedure with the base station (steps S103 to S106). First, the terminal transmits a preamble on a physical random access channel (PRACH) (S103) and can receive a response message for the preamble from the base station on a PDCCH and a corresponding PDSCH (S104). If the terminal receives a valid random access response message, the terminal transmits data including its own identifier, etc. to the base station on a physical uplink shared channel (PUSCH) indicated by an uplink grant transmitted from the base station on the PDCCH (S105). Next, the terminal waits for reception of a PDCCH as instructed by the base station to resolve collisions. If the terminal successfully receives the PDCCH with its own identifier (S106), the random access procedure ends. During the random access procedure, the terminal can acquire terminal-specific system information required for the terminal to operate correctly in the physical layer of the RRC layer. If the terminal acquires the terminal-specific system information in the RRC layer, the terminal enters the RRC connected mode (RRC_CONNECTED mode).

[0045] The RRC layer is used to generate and manage messages for control between a terminal and a radio access network (RAN). Furthermore, the base station and terminal can broadcast cell system information required for all terminals in the cell, manage paging message transmission, manage mobility and handover, report terminal measurements and related control, and manage and store terminal capabilities at the RRC layer. Generally, the update of signals transmitted at the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission / reception period (i.e., transmission time interval, TTI) at the physical layer, so that the RRC configuration can be maintained unchanged for a long period.

[0046] After the above procedures, the UE receives a PDCCH / PDSCH (S107) and transmits a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general uplink / downlink signal transmission procedure. In particular, the UE receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the UE. The format of the DCI may vary depending on the purpose of use. The uplink control information (UCI) transmitted by the UE to the base station via the uplink includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI are included in channel state information (CSI). In the case of a 3GPP NR system, the UE transmits control information such as the above-mentioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0047] FIG. 4 is a diagram illustrating an SS / PBCH block for initial cell access in a 3GPP NR system.

[0048] When a terminal is powered on or attempts to access a new cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. During the cell search process, the terminal detects the cell's physical cell identity (NcellID). To do this, the terminal receives synchronization signals, such as 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 obtains information such as a cell identity (ID).

[0049] The synchronization signal (SS) will be described in more detail with reference to Figure 4(a). The synchronization signal is divided into a PSS and an SSS. The PSS is used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS is used to obtain frame synchronization and a cell group ID. Referring to Figure 4(a) and Table 1, an SS / PBCH block consists of 20 consecutive RBs (=240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, 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 subcarriers 56 to 182. Here, the lowest subcarrier index in the SS / PBCH block starts from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, i.e., subcarriers 0 to 55 and 183 to 239. In addition, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals through subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block excluding the signals.

[0050] [Table 1]

[0051] The SS groups a total of 1008 unique physical layer cell IDs (physical layer cell IDs) into 336 physical layer cell ID groups, each containing three unique identifiers, through a combination of three PSSs and SSSs. Specifically, each physical layer cell ID is part of only one physical layer cell ID group. Thus, the physical layer cell ID NcellID=3N(1)ID+N(2)ID is uniquely defined by an index N(1)ID ranging from 0 to 335 indicating a physical layer cell ID group and an index N(2)ID ranging from 0 to 2 indicating a physical layer identifier within the physical layer cell ID group. The UE detects the PSS and identifies one of the three unique physical layer identifiers. The UE also detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the PSS sequence dPSS(n) is expressed as Equation 1 below.

[0052] dPSS(n)=1-2x(m) m=(n+43N(2)ID) mod 127 0≦n<127

[0053] where x(i+7)=(x(i+4)+x(i)) mod 2,

[0054] Given that [x(6)x(5)x(4)x(3)x(2)x(1)x(0)]=[1110110].

[0055] Also, the SSS sequence dSSS(n) is as follows:

[0056] dSSS(n)=[1-2x0((n+m0) mod 127][1-2x1((n+m1) mod 127] m0=15 floor(N(1)ID / 112)+5N(2)ID m1=N(1)ID mod 112 0≦n<127

[0057] where x0(i+7)=(x0(i+4)+x0(i))mod 2 x1(i+7)=(x1(i+1)+x1(i))mod 2,

[0058] Given that [x0(6)x0(5)x0(4)x0(3)x0(2)x0(1) 0(0)]=[0000001], [x1(6)x1(5)x1(4)x1(3)x1(2)x1(1)x1(0)]=[0000001].

[0059] A 10-ms radio frame is divided into two 5-ms half-frames. Referring to FIG. 4(b), the slots in which SS / PBCH blocks are transmitted within each half-frame are described. The slots in which SS / PBCH blocks are transmitted are either Cases A, B, C, D, or E. In Case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n symbol. Here, n = 0 or 1 for carrier frequencies below 3 GHz. Also, n = 0, 1, 2, or 3 for carrier frequencies above 3 GHz and below 6 GHz. In Case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n symbol. Here, n = 0 for carrier frequencies below 3 GHz. Also, n = 0 or 1 for carrier frequencies above 3 GHz and below 6 GHz. In Case C, the subcarrier spacing is 30 kHz and the start of the SS / PBCH block is {2, 8}+14*n symbols, where n=0, 1 for carrier frequencies below 3 GHz. For carrier frequencies above 3 GHz and below 6 GHz, n=0, 1, 2, 3. In Case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is {4, 8, 16, 20}+28*n symbols, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz. In Case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n symbols. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies above 6 GHz.

[0060] 5 is a diagram showing a procedure for transmitting control information and a control channel in a 3GPP NR system. Referring to FIG. 5(a), a base station adds a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., DCI) S202. The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more terminals includes at least 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). The UE-specific RNTI includes at least one of a cell temporary RNTI (C-RNTI), a CS-RNTI, or an MCS-C-RNTI. The base station then performs channel encoding (e.g., polar coding) S204 and rate-matching S206 according to the amount of resource(s) used for PDCCH transmission. The base station then multiplexes DCI(s) based on a CCE (control channel element)-based PDCCH structure S208. The base station then applies additional processes S210, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI(s) and maps them to resources to be transmitted. A CCE is the basic resource unit for the PDCCH, and one CCE consists of multiple (e.g., six) resource element groups (REGs). One REG consists of multiple (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as the aggregation level. 3GPP NR systems use aggregation levels of 1, 2, 4, 8, or 16.FIG. 5(b) is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region accordingly.

[0061] FIG. 6 is a diagram showing a CORESET in which a PDCCH is transmitted in a 3GPP NR system.

[0062] A CORESET is a time-frequency resource over which a PDCCH, a control signal for a terminal, is transmitted. A search space, which will be described later, is mapped to one CORESET. Therefore, a terminal does not monitor all frequency bands to receive a PDCCH, but rather monitors a time-frequency region designated as a CORESET and decodes the PDCCH mapped to the CORESET. A base station configures one or more CORESETs for each cell of a terminal. A CORESET consists of up to three consecutive symbols on the time axis. A CORESET also consists of six consecutive PRBs on the frequency axis. In the embodiment 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 at any symbol within a slot. For example, in the embodiment 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.

[0063] FIG. 7 is a diagram illustrating a method for configuring a PDCCH search space in a 3GPP NR system.

[0064] At least one search space exists in each CORESET for transmitting a PDCCH to a terminal. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter referred to as PDCCH candidates) on which the PDCCH of the terminal is transmitted. The search space includes a common search space that all 3GPP NR terminals 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 a cell belonging to the same base station monitor a PDCCH that is configured to be commonly searched. In addition, the terminal-specific search space is configured for each terminal so that the PDCCH allocated to each terminal is monitored at a different search space position depending on the terminal. In the case of a terminal-specific search space, the search spaces allocated to terminals may partially overlap due to the limited control region to which the PDCCH is allocated. Monitoring the PDCCH includes blind decoding of PDCCH candidates in the search space. If blind decoding is successful, the PDCCH is said to be (successfully) detected / received, and if blind decoding fails, the PDCCH is said to be undetected / unreceived or not successfully detected / received.

[0065] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals to transmit downlink control information to one or more terminals is referred to as a group common (GC) PDCCH or a common PDCCH. Also, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal to transmit uplink scheduling information or downlink scheduling information to one specific terminal is referred to as a terminal-specific PDCCH. The common PDCCH is included in a common search space, and the terminal-specific PDCCH is included in the common search space or the terminal-specific PDCCH.

[0066] A base station notifies each terminal or a group of terminals of information regarding resource allocation of transmission channels, a paging channel (PCH) and a downlink-shared channel (DL-SCH) (i.e., DL Grant) or information regarding resource allocation of a UL-SCH and hybrid automatic repeat request (HARQ) (i.e., UL Grant) via a PDCCH. The base station transmits PCH transport blocks and DL-SCH transport blocks via a PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. In addition, terminals receive data excluding specific control information or specific service data via the PDSCH.

[0067] A base station transmits information on which terminal (one or more terminals) PDSCH data is transmitted to and how the terminal should receive and decode the PDSCH data, by including the information in a PDCCH. For example, assume that DCI transmitted over a specific PDCCH is CRC masked with RNTI "A," and the DCI indicates that the PDSCH is allocated to radio resource "B" (e.g., frequency location), and indicates transmission format information "C" (e.g., transmission block size, modulation scheme, coding information, etc.). A terminal monitors the PDCCH using its own RNTI information. In this case, if there is a terminal that blind decodes the PDCCH using RNTI "A," the terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0068] Table 2 shows an example of a PUCCH used in a wireless communication system.

[0069] [Table 2]

[0070] The PUCCH is used to transmit the following uplink control information (UCI):

[0071] - SR (Scheduling Request): Information used to request uplink UL-SCH resources.

[0072] HARQ-ACK: A response to a PDCCH (indicating DL SPS release) and / or a response to an uplink transport block (TB) on a PDSCH. HARQ-ACK indicates whether information transmitted via a PDCCH or a PDSCH has been received. HARQ-ACK responses include a positive ACK (simply referred to as ACK), a negative ACK (hereinafter referred to as NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. Generally, ACK is represented by a bit value of 1, and NACK is represented by a bit value of 0.

[0073] 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.

[0074] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios, various channel environments, and frame structures.

[0075] PUCCH format 0 is a format that transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted using one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted using two OFDM symbols, the same sequence is transmitted in two symbols using different RBs. This allows the UE to obtain frequency diversity gain. More specifically, the UE determines a cyclic shift value mcs according to the Mbit-bit UCI (Mbit = 1 or 2), cyclically shifts a 12-length base sequence by the determined mcs value, maps the resulting sequence to one OFDM symbol and 12 REs of one PRB, and transmits it. If the number of cyclic shifts available to the UE is 12 and Mbit = 1, 1-bit UCIs 0 and 1 are represented by sequences corresponding to two cyclic shifts with a cyclic shift value difference of 6. Also, if Mbit=2, then 2-bit UCI 00, 01, 11, 10 is represented by a sequence corresponding to four cyclic shifts with a difference of three between the cyclic shift values.

[0076] PUCCH format 1 carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted using consecutive OFDM symbols 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 using BPSK. The UE modulates UCI with Mbit=2 using quadrature phase shift keying (QPSK). The modulated complex-valued symbol d(0) is multiplied by a sequence of length 12 to obtain a signal. The UE spreads the obtained signal using an orthogonal cover code (OCC) on the time axis to even-numbered OFDM symbols assigned to PUCCH format 1 and transmits it. In PUCCH format 1, the maximum number of different UEs multiplexed in the same RB can be determined depending on the length of the OCC used. In odd-numbered OFDM symbols of PUCCH format 1, a demodulation reference signal (DMRS) is spread by OCC and mapped.

[0077] PUCCH format 2 carries UCI exceeding 2 bits. PUCCH format 2 is transmitted using 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 using different RBs across the two OFDM symbols. This allows the UE to obtain frequency diversity gain. More specifically, Mbit 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.

[0078] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted using consecutive OFDM symbols 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-bit UCI (Mbit>2) using π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(Msymb-1). Here, Msymb=Mbit when π / 2-BPSK is used, and Msymb=Mbit / 2 when QPSK is used. The terminal does not apply block-wise spreading to PUCCH format 3. However, the terminal may apply block-wise spreading to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length -12 so that PUCCH format 4 has a multiplexing capacity of 2 or 4. The terminal transmit precoding (or DFT-precoding) the spreaded signal, maps it to each RE, and transmits the spreaded signal.

[0079] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of 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 the 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 and transmits only the remaining UCI information according to the priority of the UCI information.

[0080] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped is configured via RRC signaling. If 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.

[0081] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted is configured by an RRC signal. The repeatedly transmitted PUCCH should start from the same OFDM symbol position in each slot and have the same length. If the RRC signal indicates that any one of the OFDM symbols in a slot in which the UE should transmit the PUCCH is a DL symbol, the UE does not transmit the PUCCH from that slot but postpones its transmission to the next slot.

[0082] Meanwhile, in a 3GPP NR system, a terminal transmits and receives using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal is configured with a bandwidth part (BWP) consisting of a continuous portion of the carrier bandwidth. A terminal operating according to TDD or using an unpaired spectrum is configured with up to four DL / UL BWP pairs per carrier (or cell). The terminal also activates one DL / UL BWP pair. A terminal operating according to FDD or using a paired spectrum is configured with up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per 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. An activated BWP is called an active BWP.

[0083] The base station refers to the activated BWP among the BWPs configured for the UE as a DCI. The BWP indicated in the DCI is activated, and the other configured BWP(s) are deactivated. In a carrier (or cell) operating in TDD, the base station includes a bandwidth part indicator (BPI) indicating the activated BWP in the DCI scheduling the PDSCH or PUSCH to change the DL / UL BWP pair of the UE. The UE receives the DCI scheduling the PDSCH or PUSCH and identifies the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI scheduling the PDSCH to change the DL BWP of the UE. In an uplink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI scheduling the PDSCH to change the UE's UL BWP.

[0084] FIG. 8 is a conceptual diagram illustrating carrier aggregation.

[0085] Carrier aggregation refers to a method in which a mobile station uses multiple frequency blocks or (logical) cells consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers) in one large logical frequency band so that the wireless communication system can use a wider frequency band. For convenience of explanation, the term "component carrier" will be used hereinafter.

[0086] Referring to Figure 8, in an example of a 3GPP NR system, the entire system band includes up to 16 component carriers, each of which has a bandwidth of up to 400 MHz. A component carrier includes one or more physically contiguous subcarriers. While Figure 8 shows each component carrier having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Furthermore, although each component carrier is shown adjacent to each other on the frequency axis, this is shown only as a logical concept, and each component carrier may be physically adjacent to each other or separated from each other.

[0087] A different center frequency is used for each component carrier. Also, a common center frequency is used for physically adjacent component carriers. In the embodiment of Fig. 8, if it is assumed that all component carriers are physically adjacent, center frequency A is used for all component carriers. Also, if it is assumed that the component carriers are not physically adjacent, center frequency A and center frequency B are used for each component carrier.

[0088] When the entire system band is expanded by carrier aggregation, the frequency band used for communication with each terminal is defined in component carrier units. Terminal A uses the entire system band of 100 MHz and communicates using all five component carriers. Terminals B1 to B5 only use a 20 MHz bandwidth and communicate using one component carrier. Terminals C1 and C2 only use a 40 MHz bandwidth and each communicate using two component carriers. The two component carriers may or may not be logically / physically adjacent. The example in Figure 8 shows a case where terminal C1 uses two non-adjacent component carriers and terminal C2 uses two adjacent component carriers.

[0089] 9A and 9B are diagrams for explaining single-carrier communication and multi-carrier communication, in particular, FIG. 9A shows a subframe structure of a single carrier, and FIG. 9B shows a subframe structure of a multi-carrier.

[0090] Referring to FIG. 9(a), in an FDD mode, a typical wireless communication system transmits or receives data through one DL band and one corresponding UL band. In another specific embodiment, in a TDD mode, the wireless communication system divides a radio frame into uplink time units and downlink time units in the time domain, and transmits or receives data through the uplink / downlink time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) are aggregated in each of the UL and DL to support a 60 MHz bandwidth. The CCs may be adjacent or non-adjacent to each other in the frequency domain. For convenience, FIG. 9(b) illustrates a case where the bandwidths of the UL CC and the DL CC are the same and symmetrical, but the bandwidths of each CC may be determined independently. Also, asymmetric carrier aggregation, in which the number of UL CCs and the number of DL CCs are different, is possible. The DL / UL CC allocated / configured to a specific terminal via RRC is referred to as the serving DL / UL CC of the specific terminal.

[0091] A base station communicates with a 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 activated / deactivated CCs or the number of activated / deactivated CCs. When a base station allocates CCs available to a terminal in a cell-specific or terminal-specific manner, at least one of the allocated CCs may not be deactivated unless the CC allocation for the terminal is completely reconfigured or the terminal performs a handover. A CC that is not deactivated by the terminal is called a primary CC (PCC) or PCell (primary cell), and a CC that the base station can activate / deactivate freely is called a secondary CC (SCC) or SCell (secondary cell).

[0092] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink and uplink resources, i.e., a combination of DL CC and UL CC. A cell may consist of only DL resources or a combination of DL and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CC) and the carrier frequency of UL resources (or UL CC) is indicated by system information. Carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called an SCell. The carrier corresponding to a PCell in the downlink is a DL PCC, and the carrier corresponding to a PCell in the uplink is a UL PCC. Similarly, the carrier corresponding to an SCell in the downlink is a DL SCC, and the carrier corresponding to an SCell in the uplink is a UL SCC. Depending on the terminal capacity, a serving cell(s) may consist of one PCell and zero or more SCells. For a UE in RRC_CONNECTED state but not configured with carrier aggregation or not supporting carrier aggregation, there is only one serving cell consisting of only a PCell.

[0093] As described above, the term "cell" used in carrier aggregation is different from the term "cell" referring to a certain geographical area where communication services are provided by one base station or one antenna group. However, in order to distinguish between a cell referring to a certain geographical area and a cell of carrier aggregation, in the present invention, a cell of carrier aggregation is referred to as a CC, and a cell of a geographical area is referred to as a cell.

[0094] 10 is a diagram illustrating an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, a control channel transmitted over a first CC schedules a data channel transmitted over a first or second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted from the PDCCH region of the scheduling cell schedules the PDSCH / PUSCH of a scheduled cell. That is, the PDCCH region of the scheduling cell is the search space for multiple component carriers. The PCell is basically the scheduling cell, and a specific SCell is designated as the scheduling cell by a higher layer.

[0095] In the embodiment of Figure 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). It is also assumed that the DL PCCs are configured as PDCCH monitoring CCs. If cross-carrier scheduling is not configured by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC transmits only a PDCCH that schedules its own PDSCH without a CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, 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) uses the CIF to transmit not only a PDCCH that schedules the PDSCH of DL CC A but also a PDCCH that schedules the PDSCH of another CC (cross-carrier scheduling). On the other hand, no PDCCH is transmitted on other DL CCs. Therefore, depending on whether cross-carrier scheduling is configured for the UE, the UE monitors a PDCCH that does not include a CIF to receive a self-carrier scheduled PDSCH, or monitors a PDCCH that includes a CIF to receive a cross-carrier scheduled PDSCH.

[0096] 9 and 10 illustrate the subframe structure of a 3GPP LTE-A system, the same or similar structure can also be applied to a 3GPP NR system, except that in a 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

[0097] 11 is a block diagram illustrating the configuration of a terminal and a base station according to an embodiment of the present invention. In an embodiment of the present invention, the terminal may be implemented as any of various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal may be referred to as a UE, a station (STA), a mobile subscriber (MS), etc. In addition, in an embodiment of the present invention, the base station controls and manages cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area, and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may be referred to as a next generation NodeB (gNB) or an access point (AP), etc.

[0098] As shown, a terminal 100 according to one 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 .

[0099] First, the processor 110 executes various commands or programs to process data within the terminal 100. The processor 110 also controls the overall operation of the terminal 100, including each unit, 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 slot configuration based on the information, and perform communication according to the determined slot configuration.

[0100] 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. To this end, the communication module 120 includes multiple network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. Although the communication module 120 is shown as an integrated module in the drawings, the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0101] The cellular communication interface card 121 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides cellular communication services in a first frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 121 includes at least one NIC module that utilizes a frequency band below 6 GHz. The 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, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0102] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and provides cellular communication services in the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 includes at least one NIC module that uses a frequency band above 6 GHz. The 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, the external device, and the server in accordance with the cellular communication standard or protocol for the frequency band above 6 GHz that the NIC module supports.

[0103] The unlicensed band communication interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via the third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from 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 the 2.4 GHz or 52.6 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 independently or dependently performs cellular communication with at least one of the base station 200, the external device, and the server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0104] The memory 130 stores control programs and various data used by the terminal 100. The control programs include predetermined programs required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0105] Next, the user interface 140 includes various types 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 instructions from the processor 110 using various output means.

[0106] The display unit 150 then outputs various images to a display screen, and displays various display objects such as a user interface based on the content or control instructions of the processor 110.

[0107] The base station 200 according to the embodiment of the present invention also includes a processor 210 , a communication module 220 , and a memory 230 .

[0108] First, the processor 210 executes various instructions or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200, including each unit, and controls the transmission and reception of data between the units. Here, the processor 210 is configured to perform operations according to the embodiments described herein. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

[0109] 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. To this end, the communication module 220 includes multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either built-in or externally mounted. Although the communication module 220 is shown as an integrated module in the drawings, the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0110] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, the external device, and the server using a mobile communication network, and provides cellular communication services in the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that uses a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0111] The cellular communication interface card 222 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides cellular communication services in the second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 includes at least one NIC module that uses a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol for the 6 GHz or higher frequency band supported by the NIC module.

[0112] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using the third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 52.6 GHz band. The 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, the external device, and the server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0113] The terminal 100 and base station 200 shown in Figure 11 are block diagrams according to one embodiment of the present invention, and the separate blocks indicate logically distinct device elements. Therefore, the above-described device elements may be mounted on one chip or multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 150 and the display unit 150, may be selectively provided in the terminal 100. In addition, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as needed.

[0114] In an NR wireless communication system, a terminal transmits a codebook including hybrid automatic repeat request (HARQ)-ACK information to signal whether a downlink signal or channel has been successfully received. The HARQ-ACK codebook includes one or more bits indicating whether a downlink channel or signal has been successfully received. Here, the downlink channel includes at least one of a physical downlink shared channel (PDSCH), a semi-persistence scheduling (SPS) PDSCH, and a PDCCH for releasing an SPS PDSCH. HARQ-ACK codebooks are divided into semi-static HARQ-ACK codebooks (or type 1 codebooks) and dynamic HARQ-ACK codebooks (or type 2 coding). The base station configures one of the two HARQ-ACK codebooks for the terminal. The terminal uses the configured HARQ-ACK codebook.

[0115] If a semi-static HARQ-ACK codebook is used, the base station uses RRC signaling to set the number of bits of the HARQ-ACK codebook and information that determines whether each bit of the HARQ-ACK codebook successfully receives which downlink signal or channel. Therefore, the base station does not need to signal information required for transmitting the HARQ-ACK codebook to the terminal every time it needs to transmit the HARQ-ACK codebook.

[0116] If a dynamic HARQ-ACK codebook is used, the base station signals information required for generating the HARQ-ACK codebook via the PDCCH (or DCI). Specifically, the base station signals information required for generating the HARQ-ACK codebook via a Downlink Assignment Index (DAI) field of the PDCCH (or DCI). In a specific embodiment, the DAI indicates the number of HARQ-ACK codebook bits included in the HARQ-ACK codebook and information on which channel or signal each bit of the HARQ-ACK codebook indicates whether the reception is successful. The terminal receives the DAI field via the PDCCH (or DCI) that schedules the PDSCH. The value of the DAI field is divided into counter-DAI and total-DAI. The total DAI indicates the number of downlink signals or channels whose reception is indicated by the HARQ-ACK codebook up to the current monitoring occasion (MO). Counter-DAI indicates a bit of the HARQ-ACK codebook indicating whether or not the downlink signal or channel has been successfully received, among downlink signals or channels for which the success or failure of reception is indicated through the HARQ-ACK codebook up to the current cell at the current monitoring time. The PDCCH (or DCI) scheduling the PDSCH includes a value of Counter-DAI corresponding to the scheduled PDSCH. In addition, the PDCCH (or DCI) scheduling the PDSCH includes a value of Total-DAI corresponding to the scheduled PDSCH. The UE determines the number of bits of the dynamic HARQ-ACK codebook based on information signaled by the PDCCH (or DCI). Specifically, the UE determines the number of bits of the dynamic HARQ-ACK codebook based on the DAI of the PDCCH (or DCI).

[0117] FIG. 12 is a flowchart illustrating an example of a process for transmitting and receiving a physical uplink shared channel (PUSCH) according to an embodiment of the present invention.

[0118] Referring to FIG. 12, a user equipment (UE) receives RRC configuration information including information for receiving downlink control information (DCI) from a base station (S12010).

[0119] For example, the RRC configuration information may include information about a control resource set (CORESET) and a search space for the terminal to detect a PDCCH including downlink control information. In this case, the information about the control resource set may include at least one of an identifier (ID) of a control resource set in which the terminal can detect a PDCCH including DCI, control channel element (CCE) configuration information, and duration or frequency resource information of the control resource set. In this case, the information about the search space may include at least one of an identifier (ID) of a search space in which the terminal can detect a PDCCH including DCI, a format of DCI that can be detected in each search space, a detection duration, or resource information.

[0120] Thereafter, the terminal may detect the PDCCH at a monitoring occasion based on the RRC configuration information and receive DCI (S12020). The terminal may detect the PDCCH in a specific search space of the monitoring occasion according to the type of service and / or data based on the RRC configuration information and obtain DCI.

[0121] In this case, different bits may be set for the DAI included in the DCI depending on the format of the DCI. For example, in DCI Format 1_0, two bits may be set for the DAI, and in DCI Format 1_1, one bit may be set for a semi-static HARQ-ACK codebook and two bits may be set for a dynamic HARQ-ACK codebook.

[0122] The following Table 3 shows an example of DAI bits in the DCI format.

[0123] [Table 3]

[0124] Furthermore, a terminal may be allocated resources for receiving a PDSCH or transmitting a PUSCH via a PDCCH (or DCI).

[0125] Thereafter, the terminal may receive a PDSCH on the allocated resource or transmit a PUSCH to the base station (S12030). If the terminal receives a PDSCH from the base station, the terminal may generate a HARQ-ACK codebook indicating ACK / NACK of the received PDSCH based on a DAI value included in a PDCCH (or DCI) that schedules the PDSCH, and may include the generated HARQ-ACK codebook in uplink control information (UCI) and transmit it to the base station. In this case, the PUSCH may be repeatedly transmitted between slots on the resource allocated via the DCI.

[0126] The symbols allocated by the base station via DCI for repeatedly transmitting the PUSCH may be allocated to the terminal using the position of the starting symbol, the length of the allocated resource, and the number of repetitions. If the allocated symbol is an invalid symbol or overlaps with a specific symbol, the PUSCH may not be transmitted on that symbol or may be multiplexed with the signal transmitted on the specific symbol and transmitted.

[0127] For example, if a symbol for repeated transmission of a PUSCH overlaps with a symbol for transmitting a PUCCH, the terminal may multiplex the PUSCH and PUCCH and transmit the multiplexed PUSCH to the base station. Also, if a symbol allocated for repeated transmission of a PUSCH overlaps with any of the following symbols, the terminal determines (or recognizes) the symbol as an invalid symbol and does not perform repeated transmission of a PUSCH using the symbol.

[0128] - CORESET #0 symbol,

[0129] In the case of a half-duplex terminal, symbols for transmitting downlink signals of other cells and symbols on which SS / PBCH are transmitted

[0130] - Semi-static downlink symbols of the PCell

[0131] - Gap symbol after semi-static downlink symbol of PCell

[0132] - If the application of an invalid symbol pattern is indicated via DCI, the invalid symbol pattern set in the bitmap of RRC signaling

[0133] - symbols for reception of SS / PBCH,

[0134] UL preemption indication

[0135] A preemption indication refers to an indicator by which a base station preempts (or punctures) some resources of an already scheduled PDSCH to transmit a downlink signal to another terminal. Similarly, a base station can transmit an indicator by which a base station preempts (or punctures) some resources of an already scheduled PUSCH to transmit an uplink signal to another terminal. This is called an UL preemption indication or an UL cancellation indication. The present invention relates to a design of an UL preemption indication and an operation of a terminal that receives an UL preemption indication.

[0136] As one embodiment of the present invention, a terminal may be configured by an RRC signal to receive an UL preemption indication, and the UL preemption indication may be transmitted via a group-common PDCCH. That is, a search space, a monitoring period, and an RNTI value and length for the UL preemption indication may be configured by the RRC signal, and the terminal blindly decodes DCI scrambled with the RNTI value and length. When the terminal finds the DCI scrambled with the RNTI value, the terminal can determine that the DCI is an UL preemption indication.

[0137] The UL preemption indication may transmit the following information. First, the reference UL resource may be determined as follows: The reference UL resource may include all PRBs in the UL BWP. If the monitoring period of the UL preemption indication is TINT, the reference UL resource of the UL preemption indication received in the m-th period may be determined by the following Equation 1.

[0138]

number

[0139] In Equation 1, Δoffset is an offset value, which may be configured by the RRC or may be set to a fixed value. Preferably, the offset value may be a multiple of the number of symbols in a slot. Furthermore, the Δoffset value may be determined based on the PUSCH processing time. For example, assuming that Tproc,2 is the minimum time required from receiving a PDCCH scheduling a PUSCH to generating a PUSCH, Δoffset may be a value that increases in proportion to the Tproc,2 value. For example, Δoffset may be given as ceil(Tproc,2 / Symbol_duration), where Symbol_duration is the length of one OFDM symbol. Furthermore, the UE may determine Δoffset taking into account timing advance (TA). That is, when determining Δoffset, the UE may consider the time difference between a downlink frame boundary and an uplink frame boundary, which is determined by the TA value. Furthermore, in the reference UL resource, downlink symbols can be excluded according to semi-static DL / UL assignment configured by cell-specific RRC signaling. Furthermore, flexible symbols located immediately after the downlink symbols can be excluded. In this case, the number of excluded flexible symbols may be one symbol or may be configured by RRC signaling.

[0140] To indicate which symbols are to be preempted (or punctured), the UL preemption indication can be performed using a bitmap in which the reference UL resource is divided into N parts and each part is indicated as preempted with one bit. Preferably, the length of the bitmap is 14 bits. Preferably, the reference UL resource is divided into 14 parts on the time axis, or into 7 parts on the time axis, and each part may be divided into 2 parts on the frequency axis. Preferably, when the reference UL resource has S symbols, the reference UL resource is grouped into N sets on the time axis. In one embodiment of the present invention, the terminal may be designed to allow a maximum difference of one in the number of symbols included in each set when configuring the N sets.

[0141] The S symbols included in the reference UL resource may be numbered 1, 2, ..., S in chronological order. In this case, N sets according to the above scheme are configured as follows: Of the total N sets, the first mod(S,N) set includes ceil(S / N) symbols, and the remaining N-mod(S,N) sets include floor(S / N) symbols. Here, mod(a,b) is a function that returns the remainder when a is divided by b, ceil(x) is a function that returns the smallest integer among numbers equal to or greater than x, and floor(x) is a function that returns the largest integer among numbers equal to or less than x. Here, mod(S,N) may be expressed as S-floor(S / N)*N.

[0142] When the UE receives the UL preemption indication, the UE does not transmit PUSCHs corresponding to symbols indicated as preempted by the UL preemption indication in the uplink. The UE can transmit PUSCHs in symbols not indicated as preempted by the UL preemption indication. As a method of transmitting PUSCHs, when transmitting in the remaining symbols other than the symbols indicated as preempted by the UL preemption indication, the UE can discard PUSCHs overlapping with preempted symbols without transmitting them and transmit PUSCHs overlapping with non-preempted symbols. As another method, the UE can transmit PUSCHs sequentially in transmittable symbols and discard the remaining PUSCHs without transmitting them. Referring to FIG. 34, if PUSCHs are scheduled for 14 symbols for the UE and the UL preemption indication indicates that the fifth symbol is preempted, the UE does not transmit an uplink signal in the fifth symbol. Instead, the terminal must transmit PUSCH in symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. REs (resource elements) of the PUSCH to be transmitted by the terminal may be numbered PUSCH#1, PUSCH#2, ..., PUSCH#14 when divided by OFDM symbols. That is, PUSCH#1 indicates the PUSCH RE transmitted in the first OFDM symbol of the PUSCH. Referring to Figure 34(a), the PUSCHs transmitted at symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 may be PUSCH#1, PUSCH#2, PUSCH#3, PUSCH#4, PUSCH#6, PUSCH#7, PUSCH#8, PUSCH#9, PUSCH#10, PUSCH#11, PUSCH#12, PUSCH#13, and PUSCH#14 other than PUSCH#5.Referring to Figure 34(b), the PUSCHs to be transmitted at symbols 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 are, in order, PUSCH#1, PUSCH#2, PUSCH#3, PUSCH#4, PUSCH#5, PUSCH#6, PUSCH#7, PUSCH#8, PUSCH#9, PUSCH#10, PUSCH#11, PUSCH#12, and PUSCH#13, and PUSCH#14 does not need to be transmitted.

[0143] When the UE receives the UL preemption indication, the UE may transmit the PUSCH that could not be transmitted at the symbol indicated by the UL preemption indication as preempted using another resource. In this case, the another resource is a resource different from the already scheduled PUSCH resource and is an uplink resource that is later in time than the scheduled PUSCH resource. For convenience, this resource is referred to as an additional resource. Preferably, the scheduled PUSCH and the additional resource have the same PRB in the frequency domain. In one embodiment of the present invention, the additional resource may be an uplink symbol according to the earliest semi-static DL / UL allocation after the assigned PUSCH resource. In one embodiment of the present invention, the additional resource may be a flexible symbol or an uplink symbol according to the earliest semi-static DL / UL allocation configured by RRC after the assigned PUSCH resource. In one embodiment of the present invention, the additional resource may be A symbols later than the assigned PUSCH resource. Preferably, A may be configured by an RRC signal or may be fixed.

[0144] In one embodiment of the present invention, when a PUCCH is not transmitted or fails to be transmitted in response to an UL preemption indication, the UE may determine whether to retransmit the PUCCH according to uplink control information (UCI) transmitted via the PUCCH. For example, when the PUCCH transmission is affected by the UL preemption indication (e.g., when a resource element (RE) that is a time and frequency resource allocated for the PUCCH transmission overlaps with an RE that is a time and frequency resource indicated by the UL preemption indication), the UE may not transmit the PUCCH on the resource that overlaps with the resource indicated by the UL preemption indication, and may retransmit the PUCCH including UCI on an additional resource according to uplink control information (e.g., HARQ-ACK, etc.) included in the PUCCH.

[0145] In yet another embodiment of the present invention, when a terminal receives a first PDCCH scheduling a first PUSCH transmission at a first time point and receives a second PDCCH scheduling a second PUSCH transmission at a second time point after the first time point, if the first PUSCH transmission and the second PUSCH transmission are scheduled for transmission of the same transport block (TB), the terminal does not transmit the first PUSCH scheduled by the first PDCCH, but only transmits the second PUSCH scheduled by the second PDCCH.

[0146] In this case, the terminal may determine whether the TBs transmitted via the first PUSCH and the second PUSCH are the same based on the transmitted PDCCH. Specifically, the terminal may recognize (or determine) that the TBs transmitted via the first PUSCH and the second PUSCH are the same if the HARQ process IDs of the DCIs transmitted in the first PDCCH and the second PDCCH are the same and the values ​​of the new data indicator fields indicating whether the data is new are the same.

[0147] Whether to transmit or cancel the first PUSCH may be determined according to the PUSCH processing time of the terminal. Specifically, if transmission of part or all of the first PUSCH is scheduled between the last symbol of the second PDCCH and a specific time (or symbol), the transmission of the first PUSCH cannot be canceled. That is, the terminal can transmit the first PUSCH. Conversely, part or all of the first PUSCH after a specific time (or symbol) from the last symbol of the second PDCCH may not be transmitted.

[0148] In yet another embodiment of the present invention, when a terminal receives a first PDCCH scheduling a first PUSCH transmission at a first time point and a second PDCCH scheduling a second PUSCH transmission at a second time point, if both PUSCHs are scheduled to be transmitted overlapping by at least one symbol, the terminal transmits the second PUSCH without transmitting the first PUSCH. Whether the PUSCH that is not to be transmitted is transmitted may be determined by the terminal's PUSCH processing time. More specifically, if all or part of a PUSCH transmission occurs within a specific time (or symbol) from the last symbol of the second PDCCH, that transmission cannot be canceled. That is, the terminal can transmit. Conversely, all or part of a PUSCH transmission after a specific time (or symbol) from the last symbol of the second PDCCH is not transmitted.

[0149] However, when receiving a PDCCH that schedules the transmission of a PUSCH including the same TB, canceling all previously scheduled PUSCH transmissions may result in frequency waste in terms of frequency efficiency. Also, canceling all scheduled PUSCH transmissions may result in frequency waste in terms of frequency efficiency. In addition, in some cases, it may be necessary to cancel PUSCH transmissions in some symbols among the symbols for PUSCH transmission.

[0150] To solve this problem, the present invention proposes a method of canceling only a portion of the PUSCH according to the transmitted code block group (CBG). In an embodiment of the present invention, when CBG-based transmission is configured from an upper layer, the UE may perform the following operations.

[0151] First, the number of CBGs may be configured in the terminal from a higher layer. The terminal can receive a code block group transmission indicator (CBGTI) field having the same bit length as the number of configured CBGs in DCI format 0_1. DCI format 0_1 ​​is a DCI that schedules a PUSCH. The CBGTI field may include a bitmap for CBGs to be transmitted, and the terminal can determine the CBGs to be transmitted from the bitmap for the CBGs. The terminal transmits CBGs instructed to be transmitted in the CBGTI field, but must not transmit CBGs instructed not to be transmitted.

[0152] In one embodiment of the present invention, when a terminal receives a first PDCCH scheduling a first PUSCH transmission at a first time point and a second PDCCH scheduling a second PUSCH transmission at a second time point after the first time point, both PUSCHs may be scheduled to transmit the same transport block (TB). In this case, the same CBG as the CBG included in and transmitted in the PUSCH scheduled via the second PDCCH may be transmitted in the first PUSCH. In the first PUSCH transmission, the terminal does not need to transmit symbols to which the same CBG as the CBG instructed to be transmitted in the PUSCH scheduled by the second PDCCH is mapped. Conversely, in the first PUSCH transmission, the terminal may continue to transmit the remaining symbols other than the symbols to which the same CBG as the CBG instructed to be transmitted in the PUSCH scheduled by the second PDCCH is mapped.

[0153] When the same TB is scheduled, even if the terminal receives a later scheduled PUSCH, if the previously scheduled PUSCH is multiplexed with UCI, the later scheduled PUSCH may be multiplexed with UCI and transmitted.

[0154] Specifically, when the same TB is included in the first PUSCH and the second PUSCH and the terminal receives the second PDCCH scheduling the second PUSCH, the transmission of the first PUSCH scheduled via the first PDCCH may be canceled. However, if the first PUSCH scheduled before the second PUSCH is multiplexed with UCI, the UCI multiplexed with the first PUSCH will not be transmitted unless the first PUSCH is transmitted, and the base station will not receive the UCI. Therefore, when the terminal receives the second PDCCH and does not transmit all or part of the previously scheduled first PUSCH, the UCI cannot be transmitted to the base station if the first PUSCH is multiplexed with UCI. Therefore, the terminal can multiplex the UCI onto the second PUSCH and transmit it to the base station. In this case, all information of the UCI may be multiplexed onto the second PUSCH and transmitted, or only part of the information may be multiplexed onto the second PUSCH and transmitted. The part of the information may include HARQ-ACK information.

[0155] Alternatively, the terminal may transmit information related to UCI multiplexing in a DCI field of the second PDCCH. The DCI field may be explicitly present for UCI multiplexing or may be inferred from the value of another DCI field, which may include a beta offset indicator field.

[0156] Whether to transmit the second PUSCH without transmitting the first PUSCH may be determined according to the PUSCH processing time of the terminal. Specifically, if a PDCCH for canceling PUSCH transmission is received and all or part of PUSCH transmission exists within a specific time (or symbol) from the last symbol of the PDCCH, the transmission of the first PUSCH may not be canceled.

[0157] That is, even if the same TB is scheduled via the first PDCCH and the second PDCCH, if a part or all of the first PUSCH is located within a specific time (or symbol) from the last symbol of the PDCCH, the UE cannot cancel the transmission of the first PUSCH and can transmit the first PUSCH to the base station. Conversely, if a part or all of the first PUSCH is located after a specific time (or symbol) from the last symbol of the PDCCH, it may be canceled and not transmitted.

[0158] PUSCH repetition transmission

[0159] In the enhanced ultra reliable low latency communication (eURLLC) currently under development in 3GPP NR Release 16, various technologies for providing services with low latency and high reliability are being discussed. In particular, in the uplink, in order to reduce latency and increase reliability, a method is planned in which a terminal repeatedly transmits a physical uplink shared channel (PUSCH) to a base station as quickly as possible. According to one aspect of the present invention, a method in which a terminal repeatedly transmits a physical uplink shared channel (PUSCH) as quickly as possible is disclosed.

[0160] Generally, a terminal receives PUSCH scheduling information from a base station. Such PUSCH scheduling information can be received, for example, from a PDCCH (or DCI). The terminal transmits the PUSCH in the uplink based on the received scheduling information. At this time, the time-frequency resource on which the PUSCH is transmitted can be determined from time domain resource assignment (TDRA) and frequency domain resource assignment (FDRA) information for PUSCH transmission included in the DCI. The time resource on which the PUSCH is transmitted is composed of consecutive symbols, and one PUSCH cannot be scheduled across a slot boundary.

[0161] 3GPP NR Release 15 supports inter-slot repetition transmission of PUSCH. First, the number of repetitions may be configured in the terminal from the base station. Let K be the value of the number of repetitions configured in the terminal. When the terminal receives a PDCCH (or DCI) scheduling a PUSCH in slot n and receives an instruction to transmit the PUSCH in slot n+k, the terminal can transmit the PUSCH in K consecutive slots starting from slot n+k. That is, the terminal can transmit the PUSCH in slot n+k, slot n+k+1, ..., slot n+k+K-1. The time and frequency resources for transmitting the PUSCH in each slot are the same as those specified in the DCI. That is, the PUSCH may be transmitted using the same symbol and the same PRB in each slot. To obtain diversity gain in the frequency domain, frequency hopping may be configured in the terminal. Frequency hopping can be configured as intra-slot frequency hopping, which performs frequency hopping within a slot, or inter-slot frequency hopping, which performs frequency hopping for each slot. If intra-slot frequency hopping is configured for a UE, the UE divides the PUSCH in each slot into two halves in the time domain, transmits one half using a scheduled PRB, and transmits the other half using a PRB obtained by adding an offset value to the scheduled PRB. Here, two or four offset values ​​may be configured by a higher layer, and one of these values ​​may be indicated via DCI. If inter-slot frequency hopping is configured for a UE, the UE transmits the PUSCH using a scheduled PRB in odd-numbered slots where the PUSCH is transmitted, and transmits the PUSCH using a PRB obtained by adding an offset value to the scheduled PRB in even-numbered slots. When the terminal performs repeated transmission in a slot, if a symbol in which a PUSCH is to be transmitted in a particular slot is configured as a semi-static downlink symbol, the terminal does not transmit a PUSCH in that slot.The PUSCH that could not be transmitted is deferred to another slot and not transmitted.

[0162] The reasons why the aforementioned Rel-15 repetitive transmission is not suitable for providing eURLLC services are as follows:

[0163] First, it is difficult to provide high reliability. For example, if one slot consists of 14 symbols and PUSCH is transmitted using symbols 12 and 13, it is repeatedly transmitted using symbols 12 and 13 in the next slot. Although symbols 1 to 11 can be transmitted in the next slot, they are not transmitted, making it difficult to obtain high reliability.

[0164] Second, it is difficult to provide low latency. For example, assume that one slot consists of 14 symbols and PUSCH is transmitted from symbol 0 to symbol 13 to achieve high reliability. In order for the base station to successfully receive the PUSCH, it must receive the last symbol of the PUSCH, i.e., symbol 13. Therefore, a problem occurs in that the latency increases depending on the length of the PUSCH.

[0165] To solve this problem, one aspect of the present invention discloses a method for repeatedly transmitting a PUSCH within one slot. More specifically, a terminal can continuously and repeatedly transmit a scheduled PUSCH. The term 'continuously' means that the PUSCH is transmitted again from the symbol immediately following the end of one PUSCH. This method can be called mini-slot-level PUSCH repetition transmission or PUSCH repetition type B, and the aforementioned 3GPP NR Release 15 repetition transmission method can be called slot-level PUSCH repetition transmission method or PUSCH repetition type A.

[0166] Mini-slot-level PUSCH repetition transmission can solve the problems that occur in the slot-level PUSCH repetition transmission method described above.

[0167] First, high reliability can be provided. For example, if one slot consists of 14 symbols and PUSCH is transmitted using symbols 12 and 13, it can be repeatedly transmitted using symbols 1 and 2 in the next slot. Therefore, since the signals are transmitted immediately and consecutively, high reliability can be achieved.

[0168] In addition, low latency can be provided. For example, assume that one slot consists of 14 symbols and PUSCH is transmitted from symbol 0 to symbol 1 to obtain high reliability. Since it is repeatedly transmitted within the slot, it may be transmitted again from symbol 2 to symbol 3 and then from symbol 4 to symbol 5. Therefore, reliability similar to that of transmitting a PUSCH with a length of 14 slots can be obtained. However, in this case, depending on the channel condition, the base station does not necessarily have to receive all repeated transmissions to successfully receive the PUSCH, but may succeed in the middle of the repeated transmissions. Therefore, depending on the situation, successful transmission after symbol 2, at which the first repeated transmission ends, can reduce latency.

[0169] However, when repeatedly transmitting a PUSCH, if a symbol for repeatedly transmitting the PUSCH overlaps with a symbol for transmitting the PUCCH, the repeatedly transmitted PUSCH and the PUCCH may be multiplexed for the PUCCH transmission. In this case, the PUSCH to be multiplexed with the PUCCH must be determined from the repeatedly transmitted PUSCHs. That is, when a resource for repeatedly transmitting the PUSCH overlaps with a resource for transmitting the PUCCH, the terminal selects a resource for multiplexing the PUCCH from the resources allocated for repeatedly transmitting the PUSCH, and multiplexes the PUSCH and the PUCCH on the selected resource and transmits the multiplexed PUSCH to the base station. Hereinafter, in the present invention, a resource may include at least one of a symbol and a PRB.

[0170] Hereinafter, in the present invention, each PUSCH repeatedly transmitted in the same TB is referred to as a PUSCH repetition, and PUSCH includes all PUSCH repetitions.

[0171] In the following description of the PUSCH repetition transmission of the present invention, the nominal PUSCH repetition refers to resources allocated by the base station in RRC configuration information and / or downlink control information (DCI) for the PUSCH repetition transmission, and the actual PUSCH repetition refers to resources consisting of only valid symbols excluding ineffective symbols from the nominal PUSCH repetition.

[0172] 13 to 18 are diagrams illustrating an example in which a PUSCH according to an embodiment of the present invention includes four PUSCH repetitions.

[0173] FIG. 13 is a diagram illustrating an example in which the PUSCH is repeatedly transmitted four times.

[0174] Referring to FIG. 13, when a terminal receives a PDCCH for scheduling PUSCH transmission from a base station, it can perform PUSCH repetition transmission, which repeatedly transmits the same TB, to reduce delay and increase reliability.

[0175] PUSCH repetition may include DMRS, and the following description will be given assuming that all PUSCH repetitions include DMRS. As shown in FIG. 13, resources for repeated transmission of PUSCH and resources for transmission of PUCCH may overlap. For example, as shown in FIG. 13, a PUCCH for transmitting UCI may be configured in the second slot. In this case, resources (e.g., symbols) configured for transmitting PUCCH may overlap with resources (e.g., symbols) for PUSCH repetition for repeated transmission of PUSCH. If the PUCCH overlaps with the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3), the terminal cannot simultaneously transmit the two channels, PUCCH and PUSCH, in one symbol, but can multiplex and transmit the PUSCH and PUCCH. A method for multiplexing PUSCH and PUCCH proposed in the present invention will be described below.

[0176] (Proposal 1: One PUSCH repetition is multiplexed with PUCCH UCI and transmitted)

[0177] When the PUSCH is repeatedly transmitted multiple times using multiple resources included in one or more slots, if the resources for the repeated transmission of the PUSCH overlap with the resources for the transmission of the PUCCH, the UE may multiplex the PUSCH repetition of one of the resources for the repeated transmission of the PUSCH with the UCI of the PUCCH and transmit the multiplexed PUSCH repetition to the base station, where the resource may include at least one of a symbol or a PRB.

[0178] Method 1: Multiplexing with the leading PUSCH repetition among PUSCH repetitions, which are PUSCH resources that overlap with PUCCH.

[0179] FIG. 14 illustrates an example of a method for multiplexing the UCI of the PUCCH with the first resource of a plurality of resources when the PUSCH is transmitted using a plurality of resources, as an embodiment of the present invention.

[0180] Referring to FIG. 14, when the resource for transmitting the PUCCH and the resource for repeatedly transmitting the PUSCH overlap with each other by at least one symbol, the UCI transmitted via the PUCCH may be multiplexed and transmitted in the PUSCH repetition located at the beginning in time among all PUSCH repetitions of the PUSCH including the overlapping PUSCH repetition.

[0181] That is, among PUSCH repetitions, which are resources allocated from a base station via DCI for transmitting a PUSCH, UCI, which is control information transmitted by a terminal to a base station, may always be multiplexed in the PUSCH repetition located at the beginning of time. In this case, UCI does not need to be multiplexed in the remaining PUSCH repetitions. For example, as shown in FIG. 14, when four PUSCH repetitions (PUSCH rep#0, PUSCH rep#1, PUSCH rep#2, and PUSCH rep#3) for transmitting a PUSCH are configured, the PUCCH may overlap with the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH retition (PUSCH rep#3).

[0182] In this case, the terminal multiplexes the UCI to be transmitted via the PUCCH with PUSCH rep#0, which is the earliest PUSCH repetition in time, and transmits the multiplexed UCI, and does not need to transmit the PUCCH separately to the base station.

[0183] That is, the PUSCH may be repeatedly transmitted using multiple resources in one or more slots, and the PUCCH for UCI (e.g., HARQ-ACK, channel state information, etc.) may be transmitted in one slot. In this case, if one or more of the resources for the repeated transmission of the PUSCH overlap with the resources for the transmission of the PUCCH, the UE may multiplex the UCI with the resource located at the top of the resources for the repeated transmission of the PUSCH and transmit the multiplexed UCI.

[0184] Method 2: Among the PUSCH repetitions that are PUSCH resources that overlap with the PUCCH, the PUSCH repetition that is located at the beginning of the slot in which the PUCCH is transmitted is multiplexed.

[0185] Figure 15 shows an example of a method for multiplexing a resource for repeated transmission of the first PUSCH in a slot in which a PUCCH is transmitted with UCI of the PUCCH when the PUSCH is transmitted using multiple resources, as one embodiment of the present invention.

[0186] 15, when a resource for transmitting a PUCCH and a resource for repeatedly transmitting a PUSCH overlap with each other by at least one symbol, UCI transmitted via the PUCCH may be multiplexed and transmitted on the PUSCH repetition located at the earliest position in time in the slot in which the PUCCH is transmitted among all PUSCH repetitions of the PUSCH overlapping with the PUSCH. That is, among PUSCH repetitions that are resources allocated via DCI of the base station for transmitting the PUSCH, a PUSCH repetition included in the slot in which the PUCCH is transmitted may be first selected, and the PUSCH repetition located at the earliest position among the selected PUSCH repetitions may be multiplexed with UCI.

[0187] In this case, UCI does not need to be multiplexed on PUSCH repetitions in slots other than the slot in which the PUCCH is transmitted, and among the PUSCH repetitions in the slot in which the PUCCH is transmitted, the remaining PUSCH repetitions other than the PUSCH repetition located at the very beginning in time do not need to be multiplexed with UCI.

[0188] For example, as shown in FIG. 15, when the PUCCH is transmitted in the second slot (slot #1) and the second slot is configured with a second PUSCH repetition (PUSCH rep #1), a third PUSCH repetition (PUSCH rep #2), and a fourth PUSCH repetition (PUSCH rep #3) for repeated transmission of the PUSCH, the resources for transmitting the PUCCH and the resources for repeated transmission of the PUSCH may overlap.

[0189] In this case, the PUCCH may overlap with the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3) in the second slot, and the UCI for the PUCCH may be multiplexed with the second PUSCH repetition (PUSCH rep#1), which is the PUSCH repetition located at the beginning of the time sequence among the PUSCH repetitions in the second slot. Since the UCI is multiplexed with the PUSCH and transmitted, the UE does not need to transmit a separate PUCCH.

[0190] Figure 16 is a diagram illustrating an example of a method for determining the subcarrier spacing and corresponding slots of resources for transmitting PUCCH that overlap with resources for transmitting PUSCH when PUSCH is transmitted using multiple resources, as one embodiment of the present invention.

[0191] If the subcarrier spacing of a cell transmitting a PUCCH differs from the subcarrier spacing of a cell transmitting a PUSCH, the slot in which the PUCCH is transmitted in Proposal 1 can be interpreted in two ways. First, the slot in which the PUCCH is transmitted may be a slot determined by the subcarrier spacing of the cell in which the PUCCH is transmitted. Second, the PUSCH repetition that overlaps with the slot in which the PUCCH is transmitted may be a PUSCH repetition included in the slot in which the PUCCH is transmitted. Second, the slot in which the PUCCH is transmitted may be a slot determined by the subcarrier spacing of the cell in which the PUSCH that overlaps with the PUCCH is transmitted.

[0192] For example, as shown in Figure 16, when the subcarrier spacing of the PUCCH is determined using the first method, the PUSCH repetitions in the slots in which the PUCCH is transmitted may be the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3).On the other hand, when the subcarrier spacing of the PUCCH is determined using the second method, the PUSCH repetitions in the slots in which the PUCCH is transmitted may be the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3).

[0193] Method 3: Multiplexing with the leading PUSCH repetition among PUSCH repetitions, which are PUSCH resources that overlap with PUCCH.

[0194] Figure 17 shows an example of a method for multiplexing UCI of PUCCH in the resource located at the beginning of the resources for repeated transmission of PUSCH that overlap with the resource in which PUCCH is transmitted when PUSCH is transmitted in multiple resources, as one embodiment of the present invention.

[0195] 17, when a resource for transmitting a PUCCH and a resource for repeatedly transmitting a PUSCH overlap with at least one symbol, UCI transmitted via the PUCCH may be multiplexed and transmitted in the PUSCH repetition located at the beginning in time among all PUSCH repetitions of the PUSCH that overlap with the PUCCH. That is, among PUSCH repetitions that are resources allocated via DCI of the base station for transmitting the PUSCH, a PUSCH repetition that is a resource overlapping with a symbol on which the PUCCH is transmitted is first selected. Then, the PUSCH repetition located at the beginning of the selected PUSCH repetitions may be multiplexed with UCI for the PUCCH.

[0196] In this case, UCI does not need to be multiplexed in PUSCH repetitions that do not overlap with resources for PUCCH, and UCI does not need to be multiplexed in the remaining PUSCH repetitions other than the first PUSCH repetition that overlaps with the symbol (or resource) on which PUCCH is transmitted.

[0197] For example, as shown in FIG. 17, if the symbol of the resource on which the PUCCH is transmitted overlaps with the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3), the UE may multiplex the UCI to be transmitted via the PUCCH in the third PUSCH repetition (PUSCH rep#2), which is the first PUSCH repetition among the third PUSCH repetition (PUSCH rep#2) and the fourth PUSCH repetition (PUSCH rep#3), and transmit the multiplexed UCI to the base station. In this case, the UE does not need to transmit a separate PUCCH.

[0198] Specifically, a PUSCH for a specific repetition type (e.g., PUSCH repetition type B) may be repeatedly transmitted using a plurality of allocated resources (PUSCH repetitions) in one or a plurality of consecutive slots, and a PUCCH for UCI such as HARQ-ACK and / or CSI information may be transmitted in a single slot that overlaps with the PUSCH transmission among one or more slots. In this case, the terminal may multiplex UCI in the PUSCH repetition located at the beginning in time among a plurality of PUSCH repetitions included in the PUSCH that overlaps with the PUCCH transmission. Then, the terminal may transmit the PUSCH multiplexed with UCI to the base station.

[0199] In this case, the PUSCH repetition multiplexed with the UCI may not be the nominal PUSCH repetition, which is a resource allocated by the base station, but may be the first PUSCH repetition among the actual PUSCH repetitions that the terminal has determined to be valid symbols for repeated transmission of the PUSCH.

[0200] In order for the PUSCH repetition to be multiplexed with the UCI, certain conditions must be met, for example, the actual PUSCH repetition to be multiplexed with the UCI must include more than one symbol and must meet the processing time required for multiplexing the UCI.

[0201] That is, among the actual PUSCH repetitions excluding ineffective symbols from the nominal PUSCH repetitions, which are resources for repeated transmission of the PUSCH allocated by the base station, only the actual PUSCH repetitions including more than one symbol may be multiplexed with UCI. In other words, the terminal does not expect that the actual PUSCH repetitions multiplexed with the PUCCH will consist of one symbol.

[0202] Method 4: Multiplexing with the leading PUSCH repetition among the PUSCH repetitions, which are PUSCH resources that overlap with the slot in which the PUCCH is transmitted.

[0203] Specifically, when a resource for transmitting a PUCCH and a resource for repeatedly transmitting a PUSCH overlap by at least one symbol, UCI for the PUCCH may be multiplexed in the first PUSCH repetition among the PUSCH repetitions overlapping with the slot in which the PUCCH is transmitted. That is, the terminal may select a PUSCH repetition that overlaps with the slot in which the PUCCH is transmitted among the PUSCH repetitions for repeatedly transmitting the PUSCH. Then, the terminal may multiplex UCI in the first PUSCH repetition among the selected PUSCH repetitions and transmit the multiplexed PUSCH repetition to the base station. In this case, UCI may not be multiplexed in PUSCH repetitions that do not overlap with the slot in which the PUCCH is transmitted, and UCI may not be multiplexed in the remaining PUSCH repetitions other than the first PUSCH repetition among the PUSCH repetitions overlapping with the slot in which the PUCCH is transmitted.

[0204] For example, as shown in FIG. 15, the PUCCH may be transmitted using resources in the second slot, and the second slot may overlap with the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) in which the PUSCH is repeatedly transmitted. In this case, the UCI to be transmitted via the PUCCH may be multiplexed and transmitted in the second PUSCH repetition (PUSCH rep#1), which is the first PUSCH repetition among the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) in the second slot, and the UE may not need to transmit a separate PUCCH.

[0205] Method 5: Multiplexing with the last PUSCH repetition among the PUSCH repetitions, which are PUSCH resources that overlap with the PUCCH.

[0206] FIG. 18 illustrates an example of a method for multiplexing the UCI of the PUCCH with the last resource among a plurality of resources when the PUSCH is transmitted using a plurality of resources, as an embodiment of the present invention.

[0207] 18, when a resource for transmitting a PUCCH and a resource for repeatedly transmitting a PUSCH overlap with each other by at least one symbol, UCI may be multiplexed and transmitted via the PUCCH in a PUSCH repetition located at the end in time among all PUSCH repetitions of the PUSCH that overlap with the PUSCH, in order to meet the processing time required for multiplexing the UCI of the PUCCH and the PUSCH. That is, among the PUSCH repetitions for repeatedly transmitting the PUSCH, a PUSCH repetition that overlaps with a resource (or slot) in which the PUCCH is transmitted may be selected. Then, UCI may be multiplexed in a PUSCH repetition located at the end in time among the selected PUSCH repetitions. UCI does not need to be multiplexed in PUSCH repetitions that do not overlap with slots in which PUCCH is transmitted, and UCI does not need to be multiplexed in the remaining PUSCH repetitions other than the PUSCH repetition located at the end of the PUSCH repetitions that overlap with slots (or resources) in which PUCCH is transmitted.

[0208] For example, as shown in FIG. 18, the second slot in which the PUCCH is transmitted may overlap with the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3). In this case, UCI to be transmitted via the PUCCH may be multiplexed and transmitted in the fourth PUSCH repetition (PUSCH rep#1), which is the PUSCH repetition located at the end in time among the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), and the fourth PUSCH repetition (PUSCH rep#3) in the second slot, and the UE does not need to transmit a separate PUCCH.

[0209] In methods 1 to 5 of Proposal 1, when the PUCCH and PUSCH repetitions overlap, the following two points may be taken into consideration when selecting the PUSCH repetition, which is a resource for multiplexing UCI.

[0210] First, the PUSCH repetition must satisfy the processing time required for multiplexing UCI onto the PUSCH repetition. Specifically, in order to multiplex UCI onto the PUSCH repetition, processing time is required for multiplexing. If there is a PUSCH repetition that does not satisfy the processing time, the PUSCH repetition that does not satisfy the processing time may be excluded, and a PUSCH repetition to be multiplexed with UCI may be selected from among the PUSCH repetitions that satisfy the processing time.

[0211] If the processing time for multiplexing all PUSCH repetitions is not sufficient, the PUSCH repetitions do not need to be multiplexed with UCI. In this case, the terminal can transmit UCI to the base station via PUCCH without multiplexing it with PUSCH repetitions, and does not need to transmit PUSCH with PUSCH repetitions that overlap with PUCCH.

[0212] The PUSCH that is not transmitted due to the transmission of the PUCCH may be transmitted after the transmission of the PUCCH.

[0213] Second, there may be a delay constraint on the transmission of UCI, i.e., if there is a delay time constraint that requires UCI to be transmitted within a certain time, the UE may select a PUSCH repetition from only those PUSCH repetitions that can satisfy this delay time, and multiplex UCI.

[0214] For example, if a condition for a delay time limit for transmitting UCI is configured by a higher layer with a specific value, the UE must transmit UCI to the base station within the configured delay time. Therefore, the UE can select a PUSCH repetition for multiplexing UCI from among PUSCH repetitions that satisfy the delay time limit, excluding PUSCH repetitions that cannot satisfy (violate) the delay time limit.

[0215] That is, UCI does not need to be multiplexed in PUSCH repetitions located in symbols other than those given by a higher layer under constraints on delay time.

[0216] (Proposal 2: Multiple PUSCH repetitions are multiplexed with PUCCH UCI and transmitted)

[0217] When the PUSCH is repeatedly transmitted multiple times using multiple resources in one or multiple consecutive slots, if resources for the repeated transmission of the PUSCH overlap with resources for the transmission of the PUCCH, the UE may multiplex multiple PUSCH repetitions among the resources for the repeated transmission of the PUSCH and the PUCCH, and transmit the multiplexed PUSCH repetitions to the base station, where the resources may include at least one of a symbol or a PRB.

[0218] Method 0: Transmit UCI for PUCCH at all PUSCH repetitions for PUSCHs that overlap with PUCCH

[0219] When a resource for transmitting a PUCCH and a PUSCH repetition overlap by at least one symbol, UCI may be multiplexed and transmitted in all PUSCH repetitions of the PUSCH that overlap with the PUCCH. In other words, UCI may be multiplexed and transmitted in all of one or more PUSCH repetitions included in one PUSCH.

[0220] Method 1: Transmit UCI for PUCCH with PUSCH repetition overlapping with PUCCH

[0221] When the resource for transmitting the PUCCH and the PUSCH repetition overlap with at least one symbol, UCI may be multiplexed and transmitted in all of the PUSCH repetitions that overlap with the PUCCH. In other words, from the PUSCH repetitions of the PUSCH, the PUSCH repetition that overlaps with the symbol for transmitting the PUCCH may be selected, and the selected PUSCH repetition may be multiplexed and transmitted with UCI for the PUCCH. In this case, the PUSCH repetition that does not overlap with the symbol for transmitting the PUCCH does not need to be multiplexed with UCI.

[0222] Method 2: Transmit UCI for PUCCH at all PUSCH repetitions included in the slot where PUCCH is transmitted

[0223] When the resource for transmitting the PUCCH and the PUSCH repetition overlap by at least one symbol, UCI may be multiplexed and transmitted in all PUSCH repetitions of the slot in which the PUCCH is transmitted. In other words, from the PUSCH repetitions of the PUSCH, PUSCH repetitions included in the slot in which the PUCCH is transmitted may be selected, and UCI for the PUCCH may be multiplexed and transmitted in the selected PUSCH repetitions. That is, from the PUSCH repetitions of the PUSCH, a slot in which the PUCCH is transmitted may be selected, and UCI may be multiplexed and transmitted in the PUSCH repetitions included in the selected slot. In this case, UCI does not need to be multiplexed in the PUSCH repetitions of the slot in which the PUCCH is not transmitted.

[0224] Method 3: UCI of PUCCH is multiplexed and transmitted in the PUSCH repetition located at the beginning of each slot that overlaps with PUCCH.

[0225] When the resource for transmitting the PUCCH and the PUSCH repetition overlap by at least one symbol, a slot for transmitting the PUCCH from the cell for transmitting the PUSCH may be selected first, and then UCI may be multiplexed and transmitted in the PUSCH repetition located at the beginning of the time sequence among the PUSCH repetitions in each selected slot.

[0226] Method 4: PUCCH UCI is multiplexed and transmitted in the PUSCH repetition slot located at the beginning of each slot that overlaps with the PUCCH slot.

[0227] When the PUCCH and the PUSCH repetition for repeated transmission of the PUSCH overlap with each other by at least one symbol, a slot overlapping with a slot in which the PUCCH is transmitted from a cell in which the PUSCH is transmitted may be selected first, and then UCI may be multiplexed and transmitted in the PUSCH repetition located at the beginning of the selected slot in time.

[0228] When UCI is multiplexed in multiple PUSCH repetitions, UCI may be transmitted in the following manner.

[0229] Method 1: When all the same UCIs are multiplexed into each of multiple PUSCH repetitions, all the same UCIs may be repeatedly transmitted in each PUSCH repetition. That is, when a base station receives UCIs multiplexed in one PUSCH repetition, it can successfully receive the UCIs even if it does not receive other PUSCH repetitions because all UCIs are included in one PUSCH repetition.

[0230] Method 2: When UCI is multiplexed with multiple PUSCH repetitions, the UCI may be divided as evenly as possible among the PUSCH repetitions and transmitted. That is, when UCI is multiplexed with multiple PUSCH repetitions, the UCI may be divided into equal bits and included in each of the multiple PUSCH repetitions to be multiplexed, and then transmitted.

[0231] In this case, UCI may be evenly multiplexed by PUSCH repetitions so as to have a difference of up to 1 bit. For example, if UCI includes HARQ-ACK, CSI type 1, CSI type 2, etc., UCI may be evenly divided into N PUSCH repetitions, each with X bits, and included. In this case, ceil(X / N)-bit UCI may be multiplexed into mod(X,N) PUSCH repetitions, and floor(X / N)-bit UCI may be multiplexed into the remaining N-mod(X,N) PUSCH repetitions.

[0232] Method 3: In PUSCH repetitions included in one slot, UCI may be divided as evenly as possible for transmission, i.e., UCI may be divided into equal bits and multiplexed in PUSCH repetitions included in the same slot, but UCI may not be divided and transmitted in PUSCH repetitions of different slots.

[0233] In yet another embodiment of the present invention, when the PUCCH and the PUSCH overlap with each other in at least one symbol, the terminal may transmit the PUCCH without transmitting the PUSCH in the following cases.

[0234] First, if the priority of the UL-SCH transmitted on the PUSCH is lower than the priority of the UCI transmitted on the PUCCH, the PUSCH that overlaps with the PUCCH may not be transmitted, and only the PUCCH may be transmitted. In this case, the priority may be indicated via the PDCCH that schedules the PUSCH and the PUCCH, or may be configured by a higher layer.

[0235] Second, if there are no or insufficient PUSCH resources for multiplexing and transmitting UCI onto a PUSCH, the PUSCH that overlaps with the PUCCH may not be transmitted, and only the PUCCH may be transmitted. For example, if a one-symbol PUSCH and a DMRS symbol of the PUSCH are located at the last symbol of the PUSCH and UCI must be multiplexed in the symbol immediately following the DMRS symbol, there may be no resources for multiplexing and transmitting UCI. In this case, since UCI cannot be multiplexed onto a PUSCH, the UE may transmit a PUCCH without transmitting a PUSCH.

[0236] That is, when PUSCH repetition and UCI (e.g., HARQ-ACK and / or CSI information, etc.) are multiplexed, the PUSCH repetition may consist of two or more symbols. In other words, the terminal may assume that the PUSCH repetition overlapping with the PUCCH includes one or more symbols.

[0237] When there are no or insufficient PUSCH resources for multiplexing and transmitting UCI on a PUSCH (for example, when a one-symbol PUSCH and a DMRS symbol of the PUSCH are located at the last symbol of the PUSCH and UCI must be multiplexed on the symbol immediately following the DMRS symbol), UCI cannot be multiplexed on a PUSCH because there are no resources for transmitting UCI. In this case, the terminal may transmit PUCCH without transmitting PUSCH on a resource overlapping with PUCCH. Alternatively, the terminal may transmit PUSCH on the resource but not PUCCH. Alternatively, the terminal may indicate which of PUSCH and PUCCH to transmit may be indicated to the terminal via PDCCH. For example, the channel indicated by the PDCCH transmitted last is transmitted, and the other channels are not transmitted, or the transmitted channel may be determined by DCI transmitted by PDCCH.

[0238] Specifically, if a specific field included in the DCI scheduling the PUSCH indicates a specific code point, the PUCCH may be transmitted without transmitting the PUSCH. Here, the specific code point may be indicated as a beta_offset value of 0. The beta_offset is indicated by a DCI field called a beta_offset indicator and is a parameter used to determine the number of REs to be occupied when the UCI of the beta_offset is multiplexed onto the PUSCH.

[0239] In the second method above, if there are no or insufficient resources to multiplex and transmit UCI onto the PUSCH in the symbol next to the DMRS symbol of the PUSCH (for example, if the DMRS symbol of the PUSCH is located at the last symbol of the PUSCH and there is no symbol next to the DMRS symbol, or if there is a symbol next to the DMRS symbol of the PUSCH but the number of REs for the symbol is insufficient, making it impossible to transmit UCI while satisfying a sufficient code rate), the UCI may be multiplexed using additional REs in a symbol located immediately before the DMRS symbol. As an example, UCI is sequentially mapped and multiplexed from the symbol immediately after the symbol to which the DMRS of the PUSCH is mapped to the subsequent symbols. If there are insufficient REs required for multiplexing during UCI mapping, UCI is sequentially mapped and multiplexed from the symbol immediately before the symbol to which the DMRS is mapped to the previous symbol.

[0240] As another example, UCI may be mapped alternately to the symbol immediately following the symbol to which DMRS is mapped and multiplexed with PUSCH. That is, UCI is first mapped and multiplexed to the symbol immediately following the symbol to which DMRS is mapped. If there are insufficient REs to multiplex UCI, UCI is mapped to the symbol immediately preceding the symbol to which DMRS is mapped. If there are still insufficient REs to multiplex UCI, UCI is mapped and multiplexed to the symbol immediately following the symbol to which DMRS is mapped. If there are still insufficient REs to multiplex UCI, UCI may be mapped and multiplexed to the symbol immediately preceding the symbol to which DMRS is mapped. If all UCI is still not mapped and there are insufficient REs, UCI may be mapped and multiplexed to the symbol immediately preceding the symbol to which DMRS is mapped. In this way, UCI may be mapped alternately to the previous and subsequent symbols around the symbol to which DMRS is mapped. As another example, UCI may be unconditionally mapped and multiplexed to the remaining symbols other than the symbol to which DMRS is mapped, starting from the symbol located most immediately in time.

[0241] If a resource (e.g., RE) not mapped by the DMRS exists in a symbol to which the DMRS is mapped, the resource may be used for multiplexing the UCI. For example, first, the UCI may be sequentially mapped and multiplexed from the symbol immediately following the DMRS symbol to subsequent symbols. If there are insufficient REs for multiplexing the UCI, the UCI may be mapped and multiplexed to REs not mapped to the DMRS in the symbol to which the DMRS is mapped. After that, if there are insufficient REs for multiplexing the UCI, the UCI may be sequentially mapped and multiplexed from the symbol preceding the symbol to which the DMRS is mapped to the symbol preceding that.

[0242] As another example, UCI may be first mapped to a symbol immediately following a symbol to which DMRS is mapped. Then, if there are insufficient REs for multiplexing UCI, UCI may be mapped to resources (e.g., REs) to which DMRS is not mapped in the symbol to which DMRS is mapped, and multiplexed. If there are insufficient REs for multiplexing UCI, UCI may be mapped to a symbol immediately preceding a symbol to which DMRS is mapped, and multiplexed.

[0243] If additional REs are required for multiplexing UCI, UCI can be multiplexed by sequentially mapping it to the symbol immediately after the symbol to which DMRS is mapped and the symbol immediately before the symbol to which DMRS is mapped in order. In this way, UCI may be mapped alternately to the subsequent symbols and previous symbols around the DMRS symbol.

[0244] In yet another embodiment, UCI may be multiplexed unconditionally in sequence from the symbol located at the very beginning of time among all symbols.

[0245] Yet another problem to be solved by the present invention relates to a method for transmitting UCI when a PUCCH for transmitting a low-priority HARQ-ACK and a PUCCH for transmitting a high-priority scheduling request (SR) overlap in at least one symbol.

[0246] In NR Rel-15, when the PUCCH transmitting the SR and the PUCCH transmitting the HARQ-ACK overlap for at least one symbol, the following operation occurs.

[0247] In the case of SR with PUCCH format 0 + HARQ-ACK with PUCCH format 1, that is, when the resources of PUCCH format 0 for transmitting SR and PUCCH format 1 for transmitting HARQ-ACK overlap, the terminal transmits HARQ-ACK with PUCCH format 1 and does not transmit SR with PUCCH format 0 (here, SR is only allowed if it is a positive SR). However, because SR has a relatively high priority, not transmitting SR may not be correct.

[0248] To solve the above problems, the following method is proposed:

[0249] Method 1: SR information may be included in the remaining bits of PUCCH format 1 and transmitted.

[0250] Specifically, in the case of PUCCH format 1, a maximum of 2 bits of information can be transmitted. If HARQ-ACK is 1 bit, 1 bit remains. SR transmitted in PUCCH format 0 may be expressed as 1 bit. For example, 0 is negative SR and 1 is positive SR. SR information may be included in the remaining 1 bit of PUCCH format 1, and 2 bits of information may be generated by concatenating 1 bit of HARQ-ACK and 1 bit of SR, and 2 bits of HARQ-ACK and SR may be transmitted in PUCCH format 1.

[0251] If HARQ-ACK is 2 bits, the 2 bits of HARQ-ACK may be bundled to 1 bit, and the bundled 1 bit of HARQ-ACK and 1 bit of SR may be concatenated to generate information including 2 bits of HARQ-AC and SR. The generated information may be included in PUCCH format 1 and transmitted to the UE. In this case, HARQ-ACK bundling means that if both bits of HARQ-ACK indicate ACK, they are set to 1, and in the other cases they are set to 0.

[0252] Method 2: SR and HARQ-ACK information may be determined differently depending on the PUCCH format to be transmitted. Specifically, PUCCH format 0 can transmit information using 12 cyclic shift (CS) values. In the case of positive SR, the terminal can transmit PUCCH format 0 with a pre-set (or predetermined) CS value among the 12 CS values. In the case of negative SR, PUCCH format 1 for transmitting HARQ-ACK information may be transmitted to the base station as is. In the case of positive SR, HARQ-ACK information and SR information may be transmitted in PUCCH format 0 with different CS values. Here, the case of 1-bit HARQ-ACK may be as follows:

[0253] The difference between the CS value corresponding to NACK and the CS value corresponding to ACK may be 6. Here, determining both CS values ​​so that the difference of 6 occurs may be the same as determining the two CS values ​​that are the furthest apart. The CS value corresponding to NACK may not overlap with HARQ-ACK and may be a CS value used to transmit only Positive SR.

[0254] Here, in the case of a 2-bit HARQ-ACK, the following may be used.

[0255] The CS values ​​corresponding to NACK, NACK, NACK, NACK, ACK, ACK, ACK, and ACK, NACK may have a difference of 3. Here, determining four CS values ​​that result in a difference of 3 may be the same as determining four CS values ​​that are most evenly spaced apart.

[0256] Furthermore, the 2-bit HARQ-ACK corresponding to two adjacent CS values ​​among the four CS values ​​may differ by a maximum of one bit value, and the CS value corresponding to NACK, NACK, may not overlap with the HARQ-ACK and may be a CS value used for transmitting only a positive SR. The base station first determines the PUCCH format transmitted in the uplink from PUCCH format 0 or PUCCH format 1. If it is determined that PUCCH format 0 has been transmitted, it can be determined that a positive SR has been transmitted, and if it is determined that PUCCH format 1 has been transmitted, it can be determined that a negative SR has been transmitted. That is, the type of SR may be determined based on the transmitted PUCCH format. Then, HARQ-ACK information may be determined. For example, if PUCCH format 1 is transmitted, HARQ-ACK information may be determined by decoding PUCCH format 1, and if PUCCH format 0 is transmitted, HARQ-ACK information may be determined using the CS value of PUCCH format 0.

[0257] Another problem to be solved by the present invention is a situation in which a high-priority SR and a low-priority PUSCH overlap in at least one symbol. NR Rel-15 defines the following operation. If a PUSCH is scheduled for an SR occasion (a symbol that can be transmitted in the case of a positive SR), the UE transmits a PUSCH but does not transmit an SR. This is because the UE can already transmit information on the PUSCH, so there is no need to transmit an SR requesting information transmission on another uplink. However, as described above, if an SR has a high priority, an SR transmission is required for other high-priority uplink transmissions other than the PUSCH that has already been scheduled for transmission. To achieve this, the following method is proposed.

[0258] Some resources of the scheduled PUSCH may be reserved as resources for SR transmission. Then, the PUSCH does not use the resources for SR transmission, but rate matches or punctures the resources. The resources for SR transmission may be determined as follows:

[0259] First, resources for SR transmission may be reserved in the same symbols as the SR opportunities. For example, when resources for SR transmission are located in even-numbered symbols of a slot, some resources of the PUSCH in the even-numbered symbols may be reserved as resources for SR transmission. That is, resources for SR transmission may be reserved in the PUSCH using the period of the SR opportunities. Resources for SR transmission may be reserved in the PUSCH with the same period as the period of the SR opportunities. Furthermore, some resources of the PUSCH with the same number of symbols as the number of symbols of the SR opportunities may be reserved as resources for SR transmission.

[0260] In the case of positive SR, an SR having the same PUCCH format as that transmitted in the SR opportunity may be transmitted in the resource for SR transmission. If the resource reserved for SR transmission overlaps with the resource used as the DMRS of the PUSCH, the resource reserved for SR transmission may be dropped. That is, this resource may not be reserved for SR transmission.

[0261] As yet another example, the UE may transmit the DMRS in symbols other than the resources for SR transmission, and the PRB of the resources reserved for SR transmission may be a PRB located at the end of the PUSCH. For example, the PRB with the lowest index or the PRB with the highest index may be used. As yet another example, the PRB of the resources reserved for SR transmission may be the PRB closest to the SR opportunity.

[0262] In yet another embodiment of the present invention, a terminal may request a base station to multiplex UCIs of the PUCCHs or transmit them on new PUCCH resources when the PUCCH-mapped resources overlap or collide with other PUCCH resources. In other words, a method for selecting a new PUCCH resource when the UCI includes time-sensitive information is proposed.

[0263] Method 1: When resources for transmitting PUCCHs overlap or collide, the terminal may select PUCCH resources for transmitting UCIs in one slot by the following method. In a first step, the terminal excludes PUCCH resources mapped to symbols after the last symbol of a resource to which a PUCCH for transmitting a URLLC UCI (or a UCI with a higher priority) is mapped from the PUCCH resources configured in the slot. That is, PUCCH resources that end after the URLLC UCI may be excluded.

[0264] Then, in step 2, the UE sequentially checks whether UCI can be transmitted in PUCCH resources in a consecutive order among PUCCH resources whose last symbol is the same as or the previous symbol of the PUCCH resource for transmitting UCI of URLLC (or UCI with a higher priority). Here, the consecutive order may be determined based on the number of REs included in each PUCCH, a modulation order, and / or a code rate.

[0265] Specifically, the sequence may be determined in ascending order of a value obtained by multiplying the number of REs by a modulation order and a code rate. Whether UCI can be transmitted on the PUCCH resource may be determined as possible if the length of the UCI to be transmitted is smaller than the size of bits that can be transmitted via the PUCCH.

[0266] The PUCCH resource for transmitting UCI in one slot may be selected excluding the PUCCH resource that does not satisfy the processing timeline. Through this process, the UE can select one PUCCH resource for transmitting UCI.

[0267] Method 2: When resources for transmitting PUCCH overlap or collide, the terminal may select a PUCCH resource for transmitting UCI in one slot by the following method. In a first step, the terminal selects the first symbol among the last symbols of the PUCCH resources configured in the slot. In a second step, the terminal selects a PUCCH resource corresponding to the symbol selected in the first step. If there are two or more PUCCH resources corresponding to the selected symbol, the PUCCH resources may be arranged in a sequential order. In this case, the sequential order may be determined in the same manner as in method 1. Then, a PUCCH resource for transmitting UCI may be selected from the PUCCH resources arranged in a sequential order.

[0268] The terminal can transmit UCI using the PUCCH resource selected in the first and second steps. If the terminal cannot transmit UCI using the selected PUCCH resource (for example, if the selected PUCCH resource exceeds the code rate, does not meet the terminal processing time, or does not meet the UCI delay condition), the terminal can select one PUCCH resource from the remaining PUCCH resources other than the selected PUCCH resource in the first and second steps. Through these steps, the terminal can select one PUCCH resource for transmitting UCI.

[0269] Method 3: The terminal may select a PUCCH resource for multiplexing remaining UCIs other than URLLC UCIs (or UCIs with high priority) and transmit the UCIs.

[0270] Method 3 uses the Rel-15 scheme, which sorts PUCCH resources that overlap in the time domain in ascending order based on the number of REs, modulation order, and / or code rate multiplied, and sequentially determines whether UCI can be transmitted.

[0271] In this way, the first PUCCH resource for multiplexing and transmitting the remaining UCI other than the URLLC UCI (or a UCI with a higher priority) and the second PUCCH for transmitting the URLLC UCI (or a UCI with a higher priority) may be multiplexed as follows. First, if the first PUCCH resource ends earlier than or at the same time as the second PUCCH resource (for example, if the last symbol of the first PUCCH resource is the same as or an earlier symbol than the last symbol of the second PUCCH resource), and the URLLC UCI of the second PUCCH resource can be multiplexed onto the first PUCCH resource, the terminal can multiplex the URLLC and the UCI of the first PUCCH resource and transmit them all on the first PUCCH resource. In this case, the first PUCCH resource must meet the processing time for transmitting the URLLC UCI. Otherwise, the URLLC UCI cannot be multiplexed with the UCI of the first resource.

[0272] If the first PUCCH resource ends later than the second PUCCH resource (for example, if the last symbol of the first PUCCH resource is located after the last symbol of the second PUCCH resource) and UCI cannot be multiplexed onto the first PUCCH resource, the terminal may not transmit the first PUCCH resource and may transmit the URLLC resource on the second PUCCH resource.

[0273] The method proposed in the present invention is a method for transmitting an SR and an HARQ-ACK in a situation where, when an HARQ-ACK is scheduled to be transmitted in a two-symbol PUCCH format 0, the PUCCH overlaps with two PUCCHs for transmitting SRs. Here, the format of the PUCCH for transmitting an SR may include PUCCH format 0. In Rel-15 NR, when one PUCCH for transmitting an SR overlaps in time with PUCCH format 0 for transmitting an HARQ-ACK, the SR and UCI can be transmitted using the following method.

[0274] If HARQ-ACK is transmitted using one bit of PUCCH and the PUCCH transmitting SR overlaps with the PUCCH for transmitting HARQ-ACK, and if the SR is negative SR, the HARQ-ACK can transmit either 0 (NACK) or 6 (ACK) as a CS (cyclic shift) value.

[0275] When the PUCCH for transmitting an SR overlaps with the PUCCH for transmitting an HARQ-ACK and the SR is a positive SR, the terminal can transmit either 3 (NACK+positive SR) or 9 (ACK+positive SR) as a CS value to the base station. That is, when a positive SR and an HARQ-ACK overlap, the terminal can add 3 to the CS value when a negative SR overlaps with an HARQ-ACK and transmit it.

[0276] For example, if HARQ-ACK is transmitted using two bits of the PUCCH and the PUCCH transmitting the SR overlaps with the PUCCH for transmitting the HARQ-ACK, the HARQ-ACK may be transmitted with a CS value of 0 (NACK, NACK), 3 (NACK, ACK), 6 (ACK, ACK), and / or 9 (ACK, NACK). If the SR overlaps with the HARQ-ACK and is a positive SR, UCI can be transmitted with the CS value. For example, the CS value may be transmitted with a value of 1 (NACK, NACK, positive SR), 4 (NACK, ACK, positive SR), 7 (ACK, ACK, positive SR), and / or 10 (ACK, NACK, positive SR), and the HARQ-ACK and SR can be identified by the transmitted CS value. In this case, if there is an overlap with a positive SR, the CS value for the positive SR may be a value obtained by adding 1 to the CS value for negative SR.

[0277] Rel-15 NR does not consider situations where two or more SRs and PUCCH format 0 for transmitting HARQ-ACK overlap in the time domain. However, to provide Rel-16 URLLC services, it is necessary to configure SRs with shorter cycles in the uplink. Therefore, when PUCCH format 0 for transmitting HARQ-ACK is two symbols, it may overlap with the PUCCH for transmitting two SRs. In this case, a method for transmitting two SRs and HARQ-ACK is required.

[0278] Method 1: One of the two SRs is transmitted together with the HARQ-ACK, and the other SR may be dropped without being transmitted. Similarly to the method used in Rel-15, one SR and the HARQ-ACK may be transmitted using a CS value. The SR to be transmitted together with the HARQ-ACK may be determined in the following three ways:

[0279] 1) The ID of the SR may be used to determine which SRs are transmitted with the HARQ-ACK and which SRs are dropped without being transmitted. For example, an SR with a low ID may be determined as an SR that is always transmitted, or an SR with a high ID may be determined as an SR that is always transmitted.

[0280] 2) The SR to be transmitted may be determined using time domain allocation information. For example, of the PUCCHs that transmit two SRs, the PUCCH located earlier in the time domain may be determined to be the SR to be transmitted at all times. Conversely, of the PUCCHs that transmit two SRs, the SR for the PUCCH located later in the time domain may be determined to be the SR to be transmitted at all times.

[0281] 3) The SR to be transmitted may be determined by the priority of the SR. The priority of the SR may be set by a higher layer (e.g., RRC signaling). The terminal can determine that the SR with the highest priority is the SR to be always transmitted.

[0282] Method 2: Two SRs and HARQ-ACK may be transmitted separately via CS. If HARQ-ACK is 2 bits, two SRs and HARQ-ACK may be transmitted via CS in the following manner. Here, a HARQ-ACK value of 0 indicates NACK and a value of 1 indicates ACK.

[0283] The first SR and the second SR may be determined in 1) ascending order of SR ID, 2) ascending order of PUCCH symbols in which the SRs are transmitted, or 3) ascending order of SR priority. That is, if the first SR of the two SRs is positive, a CS that is a value obtained by adding 1 to the CS value for transmitting a negative SR may be transmitted, similar to the above-described method of transmitting an SR and a 2-bit HARQ-ACK in Rel-15, and if the second SR is positive, a CS that is a value obtained by adding 2 to the CS value for transmitting a negative SR may be transmitted.

[0284] The following Table 4 shows an example of CS values ​​according to SR and HARQ-ACK.

[0285] [Table 4]

[0286] When the HARQ-ACK is 1 bit, two SRs and a 1-bit HARQ-ACK may be transmitted with a CS value determined depending on whether the SR is positive or negative. For example, if the first SR of the two SRs is positive, a value obtained by adding 3 to the CS value for transmitting a negative SR may be transmitted, similar to the method of transmitting an SR and a 1-bit HARQ-ACK in Rel-15, and if the second SR is positive, a value obtained by adding 4 to the CS value for transmitting a negative SR may be transmitted.

[0287] The following Table 5 shows an example of CS values ​​according to SR and HARQ-ACK.

[0288]

Table 5

[0289] With such a method, even when the respective PUCCHs for transmitting SR and HARQ-ACK overlap, the CS value can be used to transmit HARQ-ACK and SR information to the terminal, and the terminal can recognize whether the HARQ-ACK is ACK or NACK, and whether the SR is positive or negative, based on the received SR value.

[0290] <Proposal 3: Transmit PUSCH only on valid symbols excluding specific symbols that are not valid for resource for repeated transmission of PUSCH>

[0291] Figs. 19 to 22 are diagrams showing an example of a slot format for PUSCH repeated transmission according to an embodiment of the present invention.

[0292] Fig. 19 is a diagram showing an example of resources allocated for repeated transmission of PUSCH.

[0293] Referring to Fig. 19, the resources for repeated transmission of PUSCH may be allocated by transmitting the start symbol index and the length of the allocated resources from the base station.

[0294] Specifically, the base station transmits time-domain resource allocation information for a first PUSCH repetition for repeated transmission of the PUSCH to the terminal. The resource allocation information may include a starting symbol index S, a symbol length L, and a repetition count K. The terminal determines symbols for repeated transmission of the PUSCH based on the received resource allocation information. Here, the next PUSCH repetition may be transmitted consecutively in a symbol immediately following the first PUSCH repetition. That is, in FIG. 19, the first PUSCH repetition (repetition #0) for repeated transmission of the PUSCH may be determined based on the resource allocation information, and the second PUSCH repetition (repetition #1) for repeated transmission may be determined in the symbol immediately following that.

[0295] If the PUSCH repetition for PUSCH repeated transmission crosses a slot boundary, the PUSCH repetition may be divided based on the slot boundary.

[0296] Furthermore, if one PUSCH repetition overlaps with a downlink symbol or SS / PBCH block configured by a semi-static uplink / downlink configuration, the PUSCH repetition can be transmitted using a symbol that does not overlap with the downlink symbol. Furthermore, the terminal can also exclude a flexible symbol immediately after the downlink symbol configured by the uplink / downlink configuration from the PUSCH repetition.

[0297] For example, as shown in FIG. 19, if the index of the start symbol of the first PUSCH repetition is 4, the length is 4, and the number of repetitions is 5, the third PUSCH repetition (repetition #2) crosses the slot boundary when given by the resource allocation information transmitted from the base station, so the PUSCH repetitions are divided based on the slot boundary.

[0298] This scheme has a drawback in that when PUSCH repetitions are divided at slot boundaries, the number of symbols in one PUSCH repetition becomes excessively small. To solve this problem, in one embodiment of the present invention, if a PUSCH repetition consists of only one symbol, the UE does not need to transmit the PUSCH repetition. This is because if a PUSCH repetition consists of only one symbol, data other than DMRS cannot be transmitted using the symbol. Furthermore, if the number of symbols transmitted by the PUSCH repetition is less than or equal to the number of DMRS symbols to be transmitted by the PUSCH repetition, the UE does not need to transmit the PUSCH repetition.

[0299] FIG. 20 is a diagram illustrating yet another example of resources allocated for repeated transmission of a PUSCH.

[0300] Referring to FIG. 20, resources for repeated transmission of the PUSCH may be set differently depending on slot boundaries.

[0301] Specifically, the base station transmits time-domain resource allocation information for repeated transmission of the PUSCH to the terminal. The resource allocation information may include a starting symbol index S, a symbol length L, and a repetition count K. The terminal checks whether L*K symbols from the starting symbol cross a slot boundary. If the L*K symbols do not cross a slot boundary, the first PUSCH repetition consists of L symbols starting from the starting symbol, and the subsequent (K-1) PUSCH repetitions start consecutively from the symbol immediately following the first PUSCH repetition and occupy L symbols.

[0302] If L*K symbols from the start symbol cross a slot boundary, the UE can divide the L*K symbols based on the slot boundary. For example, as shown in Figure 20, if the index of the start symbol of the PUSCH is 4, the length is 4, and the number of repetitions is 5, when provided to the UE by the time-domain resource allocation information, 20 symbols from the start symbol index 4 cross the slot boundary, so the UE can divide the 20 symbols based on the slot boundary. Therefore, in Figure 20, two PUSCH repetitions may be transmitted.

[0303] FIG. 21 is a diagram illustrating yet another example of resources allocated for repeated transmission of a PUSCH.

[0304] Referring to FIG. 21, if a resource allocated for repeated transmission includes a slot boundary, the PUSCH may not be transmitted in the resource.

[0305] Specifically, the base station transmits time-domain resource allocation information for repeated transmission of the PUSCH to the terminal. The resource allocation information may include a starting symbol index S, a symbol length L, and a repetition count K. The terminal determines symbols on which PUSCH repetitions for repeated transmission of the PUSCH are transmitted based on the resource allocation information. That is, as shown in FIG. 21, the first PUSCH repetition (repetition #0) may be determined based on the starting symbol index and symbol length included in the resource allocation information. Then, the next PUSCH repetition may be transmitted consecutively from the symbol immediately following the first PUSCH repetition.

[0306] However, after the second PUSCH repetition (repetition #1), because there are only two symbols in the slot, two more symbols must be allocated in the next slot, crossing the slot boundary. That is, due to the slot boundary, two symbols are allocated in the first slot, and two more symbols are required in the second slot. In this case, the UE does not transmit the PUSCH in the last two symbols in the previous slot and the first two symbols in the next slot, which are the corresponding resources, but can repeat and transmit the PUSCH again in the third PUSCH repetition (repetition #2) allocated in the subsequent symbols. That is, in FIG. 21, the last two symbols in the first slot and the first two symbols in the second slot (which would have been transmitted as the third PUSCH repetition if transmission were possible at the slot boundary) overlap the slot boundary and are not transmitted.

[0307] Furthermore, if one PUSCH repetition overlaps with a downlink symbol or SS / PBCH block configured by a semi-static uplink / downlink configuration, the PUSCH repetition can be transmitted using a symbol that does not overlap with the downlink symbol. Furthermore, the terminal can also exclude a flexible symbol immediately after the downlink symbol configured by the uplink / downlink configuration from the PUSCH repetition.

[0308] FIG. 22 is a diagram illustrating yet another example of resources allocated for repeated transmission of a PUSCH.

[0309] Referring to FIG. 22, when the resources allocated for repeated transmission of the PUSCH include a slot boundary, symbols located at the slot boundary may be included in the previous PUSCH repetition and the subsequent PUSCH repetition.

[0310] Specifically, the base station transmits time-domain resource allocation information for repeated transmission of the PUSCH to the terminal. The resource allocation information may include a starting symbol index S, a symbol length L, and a repetition count K. The terminal determines symbols on which PUSCH repetitions are transmitted for repeated transmission of the PUSCH based on the resource allocation information.

[0311] Here, the next PUSCH repetition is transmitted consecutively in the next symbol immediately following the first PUSCH repetition (repetition #0). If a symbol assigned to one PUSCH repetition crosses a slot boundary, the UE may divide the symbol assigned to the PUSCH repetition based on the slot boundary and include the divided symbols in adjacent PUSCH repetitions in the same slot. If there are no adjacent PUSCH repetitions in the same slot, the UE may transmit PUSCH repetitions in these symbols.

[0312] For example, as shown in Figure 22, the symbols allocated to the third PUSCH repetition cross a slot boundary. The slot boundary can separate them into two symbols, so the last two symbols in the first slot may be included in the previous PUSCH repetition (repetition #1), and the first two symbols in the second slot may be included in the next PUSCH repetition (repetition #2).

[0313] In Figures 19 to 22, when determining the PUSCH repetition for repeated transmission of the PUSCH, the downlink symbols and / or SS / PBCH blocks set by the semi-static downlink / uplink configuration of the cell in which the PUSCH repetition is transmitted are used. Furthermore, the terminal uses the following symbols and symbols for PUSCH repetition: If there is an overlap, the symbol may be considered to be the same as the downlink symbol and / or the symbol overlapping the SS / PBCH block configured by the semi-static downlink / uplink configuration of the cell where the PUSCH repetition is transmitted.

[0314] That is, if a resource allocated for PUSCH repetition overlaps with a specific symbol, the corresponding symbol is recognized as an invalid symbol, and PUSCH repetition can be transmitted only with the valid symbol. In this case, the resource allocated by the base station is referred to as a nominal PUSCH repetition, and the resource that can actually be used for PUSCH repetition transmission by excluding invalid symbols from the nominal PUSCH repetition is referred to as an actual PUSCH repetition.

[0315] 1) Semi-static DL symbols and symbols for receiving SS / PBCH blocks

[0316] When a symbol allocated by the base station according to resource allocation information for transmitting PUSCH repetition overlaps with a downlink symbol set by a semi-static uplink / downlink configuration, the terminal recognizes the symbol as an invalid symbol and can transmit PUSCH repetition using a symbol that does not overlap with the downlink symbol set by the semi-static uplink / downlink configuration. In addition, a symbol (e.g., a flexible symbol) after a symbol designated as downlink by the semi-static uplink / downlink configuration may also be recognized as an invalid symbol.

[0317] For example, symbols designated as downlink by higher layer signaling (e.g., RRC configuration) may be considered as invalid symbols for PUSCH repetition. Also, at least one symbol after the last symbol designated as downlink may be considered as an invalid symbol. In this case, at least one symbol may be a gap symbol for changing the transmission direction from downlink to uplink.

[0318] Additionally, symbols that overlap with symbols for receiving SS / PBCH blocks may also be recognized as invalid symbols. For example, symbols designated for receiving SS / PBCH blocks by system information or configuration information may be considered invalid symbols for PUSCH repetition.

[0319] 2) Symbols that overlap with CORESET#0

[0320] Symbols overlapping CORESET#0 indicated in the PBCH are determined to be invalid symbols, and the terminal cannot repeatedly transmit PUSCH using symbols overlapping CORESET#0, even if the symbols are assigned by the base station for PUSCH transmission. Here, CORESET#0 indicated in the PBCH should be used for the terminal's initial cell connection. Therefore, symbols constituting CORESET#0 should not be used for transmitting uplink channels or signals. Therefore, the terminal can recognize the nominal PUSCH repetition, which is a resource assigned for repeated transmission of PUSCH, using resource allocation information transmitted by the base station, including the start index and length of symbols transmitted by the terminal. The terminal can then recognize symbols associated with CORESET#0 as invalid symbols and remove them from the nominal PUSCH repetition.

[0321] That is, the symbols of CORESET#0, which is the resource set used for the initial access procedure indicated by the resource information transmitted from the base station, may be recognized as invalid symbols.

[0322] For example, for a specific type (e.g., Type B) of PUSCH repetition, the UE may determine symbols that are not valid for transmitting the PUSCH repetition. Specifically, symbols indicated as a specific type of search space for detecting a PDCCH for initial access in CORESET#0, which is a CORESET for initial access, may be considered as symbols that are not valid for transmitting PUSCH repetition.

[0323] Here, a specific type of search space for detecting CORESET#0 and a PDCCH for initial connection may be indicated by parameters of the MIB (Master Information Block) or SIB (System Information Block) received via the PBCH.

[0324] At this time, the PDCCH monitored in CORESET#0 indicated by the PBCH may schedule a system information block and be scrambled with the SI-RNTI.

[0325] That is, symbols overlapping with CORESET#0 may be determined as invalid symbols along with symbols indicated for downlink transmission and symbols indicated for reception of SS / PBCH blocks by the semi-static downlink / uplink configuration of the cell to which the PUSCH repetition is transmitted as described in Figures 19 to 22.

[0326] 3) Downlink symbols of other cells

[0327] If a terminal has only half duplex capability (i.e., a terminal that cannot simultaneously receive in one cell and transmit in another cell), and if reception of a downlink channel and signal is indicated or configured in another cell, the terminal cannot transmit an uplink signal to the base station using symbols that overlap with symbols for reception of a downlink channel and signal. Therefore, if a symbol configured for PUSCH repetition is configured (or indicated) as a downlink symbol in another cell, the terminal that supports only half duplex capability recognizes the symbol as an invalid symbol and does not use it for transmission of PUSCH repetition.

[0328] For example, symbols overlapping with symbols configured as downlink symbols according to the semi-static DL / UL configuration of the Pcell are invalid symbols that cannot be used for PUSCH repetition transmission. Here, the Pcell (or primary cell) is one cell in a carrier aggregation in which multiple cells are configured in a UE. The cell with the lowest index among multiple cells can be called the Pcell (or primary cell).

[0329] For example, if a terminal satisfies the following conditions and supports only half-duplex operation, and if a symbol allocated by resource allocation information transmitted from a base station for PUSCH repetition overlaps with a symbol indicated for receiving an SS / PBCH block in another cell, the terminal can consider the symbol to be an invalid symbol.

[0330] In addition, symbols indicated as downlink by the configuration information of the layer in a cell, or symbols that overlap with symbols configured for reception of downlink channels and signals in a cell (e.g., CSI-RS, PDCCH, or PDSCH, etc.) may be considered as invalid symbols for transmitting PUSCH repetition.

[0331] Alternatively, at least one of the symbols that overlap with the symbols configured to receive SS / PBCH blocks of the serving cell from which the terminal intends to transmit the PUSCH and other cells, or the symbols configured to monitor the PDCCH in CORESET #0 indicated by the PBCH, may be considered to be invalid symbols for transmitting PUSCH repetition.

[0332] 4) Symbols set by RRC

[0333] The terminal may not transmit PUSCH repetitions in symbols that are set as invalid symbols for transmitting PUSCH repetitions by higher layer parameters.

[0334] The base station can set invalid symbol pattern information for PUCCH repetition in the terminal in a bitmap format using parameters of higher layer signals. Each bit in the bitmap pattern indicates the validity of each symbol. For example, if a bit value in the bitmap is 1, the symbol corresponding to the bit value is an invalid symbol.

[0335] Invalid symbol pattern information set by a higher layer may be applied according to an indicator included in DCI transmitted by the PDCCH. That is, the DCI may include an indicator indicating whether invalid symbol pattern information set by a higher layer signal is to be applied, and the terminal may apply the symbol pattern information set by the higher layer signal according to the value of the indicator received via the DCI.

[0336] For example, if the value of the indicator transmitted in the DCI is 1, the terminal may apply pattern information of invalid symbols and recognize symbols corresponding to each bit in the bitmap of the pattern information as invalid symbols for transmitting PUSCH repetition. The terminal may transmit PUSCH repetition using the remaining symbols excluding the invalid symbols according to the pattern information from the symbols allocated for PUSCH repetition.

[0337] 5) At least G symbols following any one of 1) to 4)

[0338] Corresponding to the above 1) to 4), G symbols located after the last symbol of symbols considered to be invalid symbols may be recognized as invalid symbols. For example, at least one of the following may be considered to be invalid symbols for transmitting PUSCH repetition: G symbols after the last symbol of symbols for receiving semi-static downlink symbols and SS / PBCH blocks described in 1), G symbols after the last symbol of symbols for monitoring PDCCH in CORESET#0 indicated by PBCH described in 2), G symbols after the last symbol of downlink symbols of other cells when the UE supports only half-duplex operation described in 3), and G (G is an integer) symbols after the last symbol of symbols set as invalid symbols by RRC described in 4).

[0339] In this case, the symbols in 2) to 5) may be determined from the remaining symbols other than at least the symbols described in 1). That is, the symbols in 2) to 5) may be determined from the symbols configured as flexible symbols and / or uplink symbols according to the semi-static downlink / uplink configuration of the cell where the PUSCH repetition is transmitted, or may be determined from all symbols if there is no semi-static downlink / uplink configuration. This is because the symbols determined in 1) and the symbols determined in 2) to 5) are configured without overlapping.

[0340] As mentioned above, the symbols unavailable for PUSCH repetition transmission may include at least one of the following symbols:

[0341] 1) Semi-static DL symbols and symbols for receiving SS / PBCH blocks

[0342] 2) Symbols that overlap with CORESET#0

[0343] 3) Downlink symbols of other cells

[0344] 4) Symbols that are set as invalid symbols by RRC

[0345] 5) At least G symbols after the last symbol that falls under 1) to 4).

[0346] The UE can repeatedly transmit the PUSCH at the effective PUSCH repetition, which is a resource obtained by excluding the ineffective symbols from the nominal PUSCH repetition, which is a resource allocated in the resource allocation information of the base station for PUSCH repetition.

[0347] The five types of symbols described in 1) to 5) cannot be used for PUSCH transmission even if they correspond to symbols allocated by the base station for repeated transmission of PUSCH, and may be classified as follows depending on whether the base station schedules / transmits. Hereinafter, symbols corresponding to 1) to 5) are defined as an invalid symbol set.

[0348] The invalid symbol set of the first type is a set of symbols that are not necessarily available for uplink transmission by the terminal.

[0349] For example, the first type of invalid symbol set may be a symbol set consisting of some of the symbols described in 1) among the symbols included in the invalid symbol set. Among the symbols corresponding to 1), since they are downlink symbols set by the semi-static downlink / uplink configuration, the terminal cannot perform uplink transmission using the downlink symbols.

[0350] Alternatively, the first type of invalid symbol set may be a symbol set consisting of some of the symbols described in 1) among the symbols included in the invalid symbol set. Among the symbols corresponding to 1), symbols for receiving SS / PBCH blocks may be included in the first type of invalid symbol set. Since the symbols for receiving SS / PBCH blocks are used by the base station for downlink transmission, the terminal must receive the SS / PBCH blocks using these symbols. Therefore, the terminal cannot perform uplink transmission using these symbols.

[0351] Alternatively, the first type of invalid symbol set may be a symbol set consisting of symbols corresponding to 3) among the symbols included in the invalid symbol set. Since the symbols corresponding to 3) are used to receive downlink symbols of one cell when a terminal supports only half-duplex operation, a terminal supporting only half-duplex operation cannot perform uplink transmission using the symbols.

[0352] Alternatively, the first type of invalid symbol set may be a symbol set consisting of at least one symbol among the symbols included in the invalid symbol set that corresponds to 1) or 3). That is, at least one symbol among the semi-static downlink symbols (DL symbols) and symbols for receiving SS / PBCH blocks described in 1) and / or symbols for transmitting downlink signals of a reference cell when the terminal supports only half-duplex operation described in 3) may be included in the first type of invalid symbol set. That is, the first type of invalid symbol set may consist of all symbols that correspond to 1) and 3), or may consist of only some of the symbols that correspond to 1) and 3).

[0353] The second type of invalid symbol set is a set of symbols for which uplink transmission by the terminal is not necessarily impossible (ie, symbols for which uplink transmission is possible depending on the situation).

[0354] For example, the second type of invalid symbol set may be a symbol set consisting of symbols corresponding to 2) among the invalid symbols described above. The symbols corresponding to 2) above refer to symbols for monitoring the PDCCH in CORESET#0 indicated by the PBCH. The base station may or may not transmit the PDCCH in CORESET#0. Therefore, when the base station does not transmit the PDCCH in the corresponding symbol, the terminal can transmit an uplink signal in the symbol for monitoring the PDCCH.

[0355] In addition, when a PDCCH is detected, the terminal can transmit uplink signals in symbols after the symbol in which the PDCCH is detected among the symbols for monitoring the PDCCH, so the terminal may be able to repeatedly transmit a PUSCH in the corresponding symbol.

[0356] In this case, as mentioned above, the symbols corresponding to 1) to 5) for receiving the SS / PBCH block refer to symbols other than those set as downlink symbols according to the semi-static downlink / uplink configuration of the cell to which the PUSCH repetition in 1) is transmitted.

[0357] Also, the second type of invalid symbol set may be a symbol set consisting of symbols corresponding to 5) among the invalid symbols described above. The symbols corresponding to 5) refer to at least G symbols located after the last symbol of the symbols corresponding to 1) to 4).

[0358] The symbol corresponding to 5) is a symbol used for switching from downlink reception to uplink transmission (RX-to-TX switching) for uplink transmission after the terminal receives the signal transmitted by the symbols corresponding to 1) to 4). However, since the terminal does not always receive a downlink channel or signal by the symbols corresponding to 1) to 4), if the terminal does not receive a downlink channel or signal, there may be no symbol for switching from downlink reception to uplink transmission.

[0359] For example, in the case of a symbol set as a downlink symbol according to the semi-static downlink / uplink configuration in 1), a downlink signal is transmitted and received only when a downlink channel / signal is scheduled or configured, and therefore the symbol is not a symbol on which a downlink signal is always transmitted. Also, in 1), an SS / PBCH block is transmitted by the base station, but the terminal may skip or skip over the SS / PBCH block without receiving it in specific cases. Even in the case of 2), the base station may or may not transmit the PDCCH as a symbol for monitoring the PDCCH in CORESET#0 indicated by the PBCH. Therefore, the terminal may skip or skip over the symbol without receiving the PDCCH in a special case. Also, in 3), when the terminal supports only half-duplex operation, even if a downlink signal is transmitted in one cell, the terminal may skip or skip over the transmitted signal in specific cases. In addition, in case 4), since the base station has set the symbol as an invalid symbol, the pattern information of the invalid symbol by the higher layer signal may not be applied to the DCI indicator, and the downlink signal may not be transmitted using the symbol. Therefore, in this case, the symbol for RX-to-TX switching is not required, and the terminal may be able to perform uplink transmission using the symbol.

[0360] Alternatively, the second type of invalid symbol set may be a symbol set consisting of at least one symbol among the symbols included in the invalid symbol set that corresponds to 2) to 5). That is, the second type of invalid symbol set may be composed of all symbols that correspond to 2) to 5), or may be composed of only some of the symbols that correspond to 2) to 5).

[0361] The first type invalid symbol set and the second type invalid symbol set may not include any overlapping symbols, and the union of both symbol sets may be the same as the set of all invalid symbols. That is, the second type invalid symbol set may include only the remaining symbols other than those included in the first type invalid symbol set.

[0362] Preferably, the first type of invalid symbol set may be composed of symbols corresponding to 1) and 3) among the symbols included in the invalid symbol set, and the second type of invalid symbol set may include only the remaining symbols from the invalid symbol set excluding the symbols corresponding to the first type.

[0363] The base station can schedule PUSCH repetition for repeated transmission of the PUSCH to the terminal. Here, the PDCCH (or DCI) scheduling the PUSCH repetition may include a start symbol index and length of the first nominal PUSCH repetition and may further include the number of repetitions for which the PUSCH repetition is repeatedly transmitted. The terminal can receive the PDCCH (or DCI) and obtain information about the symbol for which the first nominal PUSCH repetition is scheduled and the number of repetitions of the PUSCH repetition based on the start symbol index and length of the received PDCCH (or DCI).

[0364] The terminal may determine a symbol for which a second nominal PUSCH repetition having a length of L is scheduled immediately after the symbol for which a first nominal PUSCH repetition is scheduled, where length L is the same as the length of the first nominal PUSCH repetition. Then, a symbol for which a third nominal PUSCH repetition having a length of L is scheduled immediately after the symbol for which a second nominal PUSCH repetition is scheduled may be determined. This process may be repeated based on the number of PUSCH repetitions obtained from the PDCCH (or DCI) until a symbol for which a corresponding PUSCH repetition is scheduled is determined.

[0365] The UE determines whether the symbols scheduled as the determined nominal PUSCH repetition overlap with symbols included in the invalid symbol set, recognizes the overlapping symbols as invalid symbols, and excludes them from the scheduled symbols. That is, the UE does not transmit PUSCH repetition with symbols that overlap with invalid symbols. The UE can determine the actual PUSCH repetition for transmitting the PUSCH by collecting consecutive symbols that do not cross a slot boundary from the remaining symbols other than the overlapping symbols.

[0366] Some symbols among the symbols in the invalid symbol set may be used for PUSCH repetition transmission in certain situations, but may always be excluded from PUSCH repetition transmission. For example, among the symbols 1) to 5) that belong to the above-mentioned invalid symbol set, symbols that are necessarily impossible for uplink transmission (symbols included in the first type invalid symbol set) are preferably excluded in the process of determining the effective PUSCH repetition for actual PUSCH transmission, while symbols that are not necessarily impossible for uplink transmission under certain conditions (symbols included in the second type invalid symbol set) are preferably selectively excluded in the process of determining the effective PUSCH repetition.

[0367] In a first embodiment of the present invention, if the determined first symbol for which nominal PUSCH repetition is scheduled overlaps with a symbol included in a first-type invalid symbol set, the UE excludes the symbol from the symbols for which nominal PUSCH repetition is scheduled. However, symbols that overlap with symbols included in a second-type invalid symbol set are not excluded from the symbols for which nominal PUSCH repetition is scheduled. That is, the UE does not transmit nominal PUSCH repetition only in symbols that overlap with the first-type invalid symbol set. The UE can determine the effective PUSCH repetition for which the PUSCH is actually transmitted by collecting consecutive symbols that do not cross a slot boundary from the remaining symbols other than the symbols that overlap with the first-type invalid symbols.

[0368] The UE excludes symbols scheduled for nominal PUSCH repetition after the determined first nominal PUSCH repetition from symbols scheduled for PUSCH repetition if the symbols are included in the invalid symbol set of the first type or overlap with the invalid symbol set of the second type. That is, the UE does not transmit nominal PUSCH repetition for symbols overlapping with the invalid symbol set of the first type or the invalid symbol set of the second type. The UE can determine the actual PUSCH repetition by collecting consecutive symbols that do not cross a slot boundary from the remaining symbols other than the symbols overlapping with the invalid symbol sets of the first and second types.

[0369] When a base station schedules PUSCH repetition for a terminal, it indicates the symbol assigned to the first nominal PUSCH repetition, and subsequent nominal PUSCH repetitions are determined by symbols after the first nominal PUSCH repetition. Therefore, the base station can indicate the symbol on which the first nominal PUSCH repetition is transmitted using the PDCCH (or DCI). If a symbol included in the second type of invalid symbol set cannot be used for the first nominal PUSCH repetition, the base station can indicate the first nominal PUSCH repetition using a symbol other than the second type of invalid symbol set. Conversely, the base station can schedule the first nominal PUSCH repetition using a symbol included in the second type of invalid symbol set. In this case, a symbol included in the second type of invalid symbol set can be used for the first nominal PUSCH repetition.

[0370] 23 and 24 are diagrams illustrating still another example of symbols for which PUSCH repetitive transmission is not possible according to an embodiment of the present invention.

[0371] FIG. 23 is a diagram illustrating an example of excluding ineffective symbols from symbols allocated for repeated transmission of a PUSCH, as an embodiment of the present invention.

[0372] Referring to Figure 23, from the above-mentioned set of invalid symbols, among the symbols corresponding to 1), symbols set as downlink by semi-static downlink / uplink configuration, and at least G symbols (assuming G = 2 in this embodiment) for switching from downlink to uplink corresponding to 5) may be excluded as invalid symbols.

[0373] In this case, symbols corresponding to 1) may be included in the first type, and symbols corresponding to 5) may be included in the second type.

[0374] 23(a), regardless of whether they are type 1 or type 2, they may be considered as invalid symbols and excluded from nominal PUSCH repetition. That is, symbols that overlap with symbols included in the invalid symbol set (the union of type 1 and type 2) may be excluded from any symbol scheduled for nominal PUSCH repetition. For example, as shown in FIG. 23(a), a terminal may receive a PDCCH (or DCI) for scheduling PUSCH repetition from a base station. In this case, the PDCCH (or DCI) may include at least one of an index value (S=5), a length (L=5), and a repetition count (K=3) of the start symbol (first symbol) of the first nominal PUSCH repetition.

[0375] The first nominal PUSCH repetition (PUSCH rep#0) does not overlap with invalid symbols of the first type (i.e., semi-static downlink symbols), but overlaps with symbols corresponding to 5) included in the second type (i.e., symbols with G=2 after the semi-static downlink symbols). Therefore, the UE can determine the remaining three consecutive symbols, excluding the two symbols corresponding to 5) in the first nominal PUSCH repetition, as the actual PUSCH repetition to be transmitted.

[0376] The last symbol of the second nominal PUSCH repetition (PUSCH rep#1) overlaps with a first type downlink symbol (i.e., a semi-static downlink symbol). Therefore, the UE can determine four consecutive symbols, excluding one semi-static downlink symbol corresponding to the first type, in the second nominal PUSCH repetition as the actual PUSCH repetition to be transmitted.

[0377] In the third nominal PUSCH repetition (PUSCH rep#2), the first two symbols overlap with the symbols included in the first type, and the third and fourth symbols overlap with the symbol corresponding to 5) of the second type. Therefore, the terminal can determine the remaining one consecutive symbol excluding the symbols corresponding to 1) and 5) in the third nominal PUSCH repetition as the actual PUSCH repetition to be transmitted.

[0378] Referring to Figure 23(b), symbols included in the first and second types of invalid symbol sets may be excluded separately. That is, symbols for which any one nominal PUSCH repetition is scheduled may be excluded separately if they overlap with symbols included in the invalid symbol set (the union of the first and second types). In other words, among symbols for which a first nominal PUSCH repetition is scheduled, symbols that overlap with symbols included in the first type of invalid symbol set may be excluded from symbols for which the first nominal PUSCH repetition is scheduled. However, among symbols for which nominal PUSCH repetitions after the first nominal PUSCH repetition are scheduled, symbols that overlap with symbols included in the first and second types of invalid symbol sets may be excluded from symbols for which nominal PUSCH repetitions after the first nominal PUSCH repetition are scheduled.

[0379] For example, as shown in Figure 23(b), the terminal may receive a PDCCH (or DCI) for scheduling PUSCH repetition from the base station, where the PDCCH (or DCI) may include at least one of an index value (S = 5) of the start symbol (first symbol) of the first nominal PUSCH repetition, its length (L = 5), and the number of repetitions (K = 3).

[0380] The first nominal PUSCH repetition (PUSCH rep#0) does not overlap with invalid symbols of the first type (i.e., semi-static downlink symbols), but overlaps with symbols corresponding to 5) included in the second type (i.e., symbols G=2 after the semi-static downlink symbols). In this case, only symbols corresponding to the first type are excluded from the scheduled symbols, and therefore symbols corresponding to 5) of the second type (G=2) are not excluded. Therefore, the UE can determine five consecutive symbols of the first nominal PUSCH repetition as the actual PUSCH repetition to be actually transmitted.

[0381] The last symbol of the second nominal PUSCH repetition (PUSCH rep#1) overlaps with an invalid symbol of the first type (i.e., a semi-static downlink symbol). Therefore, the UE can determine four consecutive symbols, excluding one semi-static downlink symbol corresponding to the first type, in the second nominal PUSCH repetition as the actual PUSCH repetition to be transmitted.

[0382] In the third nominal PUSCH repetition (PUSCH rep#2), the first two symbols overlap with the symbols included in the first type, and the third and fourth symbols overlap with the symbol corresponding to 5) of the second type. Therefore, the UE can determine the remaining one consecutive symbol other than the symbols corresponding to 1) and 5) in the third nominal PUSCH repetition as the actual PUSCH repetition to be transmitted. That is, in the third nominal PUSCH repetition, unlike the second nominal PUSCH repetition, the gap symbol corresponding to 5) may be selectively applied as an invalid symbol.

[0383] In a second embodiment of the present invention, among the symbols included in the second type of invalid symbol set, symbols that overlap with the symbol scheduled for the first nominal PUSCH repetition are used in the first nominal PUSCH repetition, and further, for nominal PUSCH repetitions after the first nominal PUSCH repetition, the symbols to be used may be determined depending on the result of the first nominal PUSCH repetition.

[0384] That is, among the symbols included in the second type of invalid symbol set, the symbols scheduled and used in the first nominal PUSCH repetition may also be considered as symbols to be used in subsequent nominal PUSCH repetitions.

[0385] For example, the second type of invalid symbol set may include symbols corresponding to the above-mentioned 5). In this embodiment, the second type of invalid symbols will be described by taking G symbols after the last symbol of the semi-static downlink symbols. If the first nominal PUSCH repetition is scheduled to overlap with some of the G symbols, the UE can use the overlapping symbols of the G symbols from the symbols for which the nominal PUSCH repetition is scheduled for transmission of the nominal PUSCH repetition without excluding them. Then, if the symbols allocated for the second nominal PUSCH repetition also overlap with some of the G symbols, the UE must decide whether to exclude or use some of the G symbols that overlap with the second nominal PUSCH repetition.

[0386] In this case, the G symbols may refer to symbols that the UE can use as RX-to-TX switching time for receiving downlink channel signals scheduled / configured in semi-static downlink symbols and transmitting uplink channel / signals. Therefore, if some overlapping symbols among the G symbols are used without being excluded from the first nominal PUSCH repetition, some overlapping symbols among the G symbols may also be used without being excluded from the second nominal PUSCH repetition.

[0387] FIG. 24 is a diagram illustrating yet another example of excluding ineffective symbols from symbols allocated for repeated transmission of a PUSCH, as an embodiment of the present invention.

[0388] Referring to Figure 24, a second embodiment may be applied, and some symbols may be excluded in PUSCH repetition. In Figure 24, a UE receives a PDCCH (or DCI) scheduling PUSCH repetition, and the PDCCH (or DCI) includes an index (S) of 5 for the first symbol of the first (nominal) PUSCH repetition, a length (L) of 3, and a repetition count of 2. The first five symbols of the slot are symbols configured as downlink symbols by semi-static downlink / uplink configuration, and the remaining symbols are symbols configured as flexible or uplink. In Figure 24, symbols corresponding to 1) (symbols configured as downlink symbols by semi-static downlink / uplink configuration) and symbols corresponding to 5) (at least G symbols after the last symbol of symbols configured as downlink symbols by semi-static downlink / uplink configuration, assuming G = 4) will be described. Here, the first type of invalid symbol set includes symbols corresponding to 1), and the second type of invalid symbol set includes symbols corresponding to 5).

[0389] FIG. 24(a) may be considered as a symbol that is not valid for both the first type and the second type, and may be excluded from the nominal PUSCH repetition. That is, from the symbols scheduled for any one nominal PUSCH repetition, symbols that overlap with the symbols included in the set of invalid symbols (the union of the first type and the second type) may be excluded. As shown in FIG. 24(a), for the first nominal PUSCH repetition, if symbols that overlap with the symbols corresponding to the first type and the second type are excluded, there are no remaining symbols. The first symbol of the second nominal PUSCH repetition overlaps with the symbols included in the second type. Therefore, the terminal can determine that the remaining two consecutive symbols other than the one symbol corresponding to 5) in the second nominal PUSCH repetition are the actual transmitted substantial PUSCH repetitions.

[0390] FIG. 24(b) is different from FIG. 24(a) in that symbols included in the second type are not excluded from the first nominal PUSCH repetition. That is, the first nominal PUSCH repetition does not overlap with the symbols corresponding to the first type, but overlaps with the symbols corresponding to the second type. However, the symbols corresponding to the second type can be used without excluding the symbols corresponding to the second type from the first nominal PUSCH repetition. In this case, the three consecutive symbols included in the first nominal PUSCH repetition can be determined as the actual transmitted substantial PUSCH repetitions. In the second nominal PUSCH repetition, it overlaps with the symbols corresponding to the second type. However, since the symbols corresponding to the second type were not excluded in the first nominal PUSCH repetition, the symbols corresponding to the second type are not excluded in the second nominal PUSCH repetition either. Therefore, the three consecutive symbols included in the second nominal PUSCH repetition may be determined as the actual transmitted substantial PUSCH repetitions.

[0391] <Proposal 4: Method for determining the numerology of gap symbols>

[0392] When at least G symbols in 5) included in the invalid symbol set are defined, the start time of the G symbols and the numerology (i.e., subcarrier spacing) of the G symbols may be determined. Hereinafter, Proposal 4 describes a method of defining at least G symbols after a semi-static downlink symbol, but this may also be applied to at least G symbols after a symbol for receiving an SS / PBCH block, at least G symbols after a symbol for monitoring a PDCCH of CORESET#0 indicated by the PBCH, and at least G symbols after a downlink signal of another cell if the terminal supports half-duplex operation. That is, it may be applied to all symbols corresponding to the above-mentioned 5).

[0393] First, the time points at which the G symbols start may be defined as follows:

[0394] If the end point of the last downlink symbol in the DL BWP (which is the same as the start point of the symbol following the last downlink symbol) is the same as the end point of any one of the uplink symbols in the UL BWP (which is the same as the start point of the symbol following the uplink symbol), the terminal can determine the end point as the start point of the G symbols.

[0395] If the end of the last downlink symbol in a DL BWP (which is the same as the start of the symbol following the last downlink symbol) is not the same as the end of any one uplink symbol in a UL BWP (which is the same as the start of the symbol following the uplink symbol), the UE may determine the end of one of the uplink symbols overlapping with the last downlink symbol as the start of the G symbol. Here, the end of the last uplink symbol among the uplink symbols overlapping with the last downlink symbol may be determined as the start of the G symbol.

[0396] That is, the starting symbol of the G symbols may be determined based on the last symbol of the symbols for uplink transmission.

[0397] As another example, the end of the leading symbol among the uplink symbols overlapping the last downlink symbol may be determined as the start of the G symbols. If the end of the last downlink symbol in the DL BWP (which is the same as the start of the symbol next to the last downlink symbol) is not the same as the end of any one uplink symbol in the UL BWP (which is the same as the start of the symbol next to the uplink symbol), the UE may determine the start of one of the uplink symbols overlapping the last downlink symbol as the start of the G symbols. Here, the start of the last uplink symbol among the uplink symbols overlapping the last downlink symbol may be determined as the start of the G symbols.

[0398] As yet another example, the start time of the leading symbol among the uplink symbols overlapping the last downlink symbol may be determined as the start time of the G symbols.

[0399] If the end of the last downlink symbol in the DL BWP (which is the same as the start of the symbol following the last downlink symbol) is not the same as the end of any one of the uplink symbols in the UL BWP (which is the same as the start of the symbol following the uplink symbol), the terminal can determine that the end of one of the uplink symbols that overlaps with the symbol following the last downlink symbol is the start of the G symbol.

[0400] Here, the end of the last symbol among the uplink symbols overlapping with the symbol next to the last downlink symbol may be determined as the start of the G symbols. As yet another example, the end of the first symbol among the uplink symbols overlapping with the symbol next to the last downlink symbol may be determined as the start of the G symbols.

[0401] If the end of the last downlink symbol in a DL BWP (which is the same as the start of the symbol following the last downlink symbol) is not the same as the end of any one uplink symbol in a UL BWP (which is the same as the start of the symbol following the uplink symbol), the UE may determine the start of one of the uplink symbols overlapping with the symbol following the last downlink symbol as the start of G symbols. Here, the start of the last symbol of the uplink symbols overlapping with the symbol following the last downlink symbol may be determined as the start of G symbols.

[0402] As yet another example, the start time of the leading symbol among the uplink symbols that overlap with the symbol next to the last downlink symbol may be determined as the start time of the G symbols.

[0403] The numerology (i.e., subcarrier spacing) of the G symbols can be determined as follows: For reference, the length of the G symbols is determined by the numerology, and the determined length of the G symbols starts from the start of the G symbols determined in the above embodiment.

[0404] First, the numerology of the G symbols may be determined as the subcarrier spacing of the active UL BWP.

[0405] As a second method, the numerology of the G symbols may be determined as the subcarrier spacing of the active DL BWP.

[0406] As a third method, the numerology of the G symbols may be determined as the maximum or minimum of the subcarrier spacing of the active DL BWP and the active UL BWP spacing.

[0407] As a fourth method, the numerology of the G symbols may be determined as the maximum or minimum value from a list of subcarrier spacings available in the cell to which the G symbols apply.

[0408] As a fifth method, the numerology of the G symbols may be determined as a reference subcarrier spacing used in a semi-static uplink / downlink configuration of a cell to which the G symbols are applied, where the reference subcarrier spacing is the length of a downlink symbol or the subcarrier spacing used to determine the length of an uplink symbol in the semi-static uplink / downlink configuration of a cell.

[0409] As a sixth method, the numerology of the G symbols may be determined to be a fixed value. This fixed value may be different between FR1 and FR2. It may also be the minimum or maximum subcarrier spacing available in each FR. For example, if the numerology is the minimum subcarrier spacing available in each FR, it may be 15 kHz subcarrier spacing in FR1 and 60 kHz subcarrier spacing in FR2. For example, if the numerology is the maximum subcarrier spacing available in each FR, it may be 60 kHz subcarrier spacing in FR1 and 120 kHz subcarrier spacing in FR2.

[0410] As a seventh method, the numerology of the G symbols may be set by the base station, i.e., the base station may transmit the subcarrier spacing used in the G symbols to the terminal, and the terminal may use the value received from the base station as the subcarrier spacing of the G symbols.

[0411] FIG. 25 illustrates an example of a method for determining invalid symbols according to one embodiment of the present invention.

[0412] Referring to FIG. 25, the terminal may be instructed to transmit a PUSCH repeatedly by the DCI of the PDCCH, and may determine symbols for which PUSCH repetition corresponding to the PUSCH cannot be transmitted, and may perform PUSCH repetition transmission in the allocated resources.

[0413] Specifically, the UE can determine symbols for which PUSCH repetition transmission is not possible. The UE can determine resources for PUSCH repetition transmission when there is an uplink channel or signal that cannot be canceled according to the UE's processing time capability. In addition, the UE can determine symbols for which PUSCH repetition transmission is not possible, such as PRACH occasions. Although the following description will be given based on an uplink signal or channel that cannot be canceled, the present invention is not limited thereto and may be equally applied to cases such as PRACH occasions.

[0414] As shown in Figure 25, the UE may be instructed to transmit PUSCH repetitions via the PDCCH. That is, the base station may transmit resource allocation information and repetition number information for PUSCH repetitions in DCI of the PDCCH, and the UE may receive time / frequency resources and the number of repetitions for the first PUSCH repetition via the PDCCH. In this case, the resource allocation information may include a start symbol index and a length of the first PUSCH repetition.

[0415] The UE transmits the first PUSCH repetition on the time / frequency resource indicated via the PDCCH, and transmits the PUSCH repetition for the number of repetitions. For example, as shown in FIG. 25, the PDCCH may schedule the first PUSCH repetition of length 2 from the 9th symbol in the first slot. That is, the DCI of the PDCCH may include a starting symbol index of 9, index information and length information related to the length of 2 for the first PUSCH repetition to indicate the PUSCH repetition, and may further include repetition number information related to the number of repetitions of 4 to indicate four repetitions.

[0416] The terminal may transmit the first repeat at the 9th and 10th symbols in the first slot, the second repeat at the 11th and 12th symbols in the first slot, the third repeat at the 13th and 14th symbols in the first slot, and the fourth repeat at the 1st and 2nd symbols in the second slot.

[0417] In this case, when transmission of an uplink signal or channel is scheduled or configured at the 11th symbol in the first slot, the terminal needs at least N2 symbols (or T2 time) from the end of the PDCCH to the symbol assigned to the uplink signal or channel in order to cancel (or drop) the transmission of the configured uplink signal or channel. That is, transmission of an uplink signal or channel within N2 symbols (or T2 time) from the end of the PDCCH cannot be canceled (or dropped) due to the terminal's processing time.

[0418] In this case, the UE may perform PUSCH repetitive transmission in the following manner.

[0419] As a first embodiment, the terminal can determine the symbol for performing PUSCH repetitive transmission regardless of whether an uplink signal or channel is canceled (or dropped).

[0420] FIG. 26 illustrates an example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention.

[0421] 26, the UE can determine symbols for repeating PUSCH transmission regardless of whether an uplink signal or channel is canceled or dropped. If a symbol for repeating PUSCH transmission overlaps with an uplink signal or channel that cannot be canceled (or dropped), repeating PUSCH transmission is not performed in the overlapping symbol, and the uplink signal or channel that cannot be canceled (or dropped) may be transmitted.

[0422] In this case, the RV (redundancy value) of each PUSCH repeat transmission may be determined to be constant regardless of whether the PUSCH repeat transmission is transmitted or not. For example, if the indicated RVs are in the order of a, b, c, and d, the RV value may be assigned as a to the first PUSCH repeat transmission, b to the second PUSCH repeat transmission, c to the third PUSCH repeat transmission, and d to the fourth PUSCH repeat transmission.

[0423] In Figure 26, the symbol for the second PUSCH repeat transmission (Rep#1) overlaps with the symbol for transmitting the SRS, which is an irrevocable signal. Therefore, the terminal can transmit the SRS in this symbol without transmitting the second PUSCH repeat transmission (Rep#1).

[0424] Although this method can easily allocate RVs and repeatedly transmit PUSCHs, reliability may be reduced because the base station repeatedly transmits PUSCHs less than the number of repetitions indicated by the DCI of the PDCCH. Also, PUSCH repeated transmissions corresponding to one of the indicated RVs are canceled (or dropped) without being performed, which may reduce reliability.

[0425] In a second embodiment, the terminal first checks whether an uplink signal or channel can be cancelled (or dropped), and then determines symbols for repeated PUSCH transmission to perform repeated PUSCH transmission.

[0426] FIG. 27 illustrates yet another example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention.

[0427] 27, the UE may first check whether an uplink signal or channel is to be cancelled (or dropped), and then determine symbols for repeated transmission of the PUSCH according to the number of repeated PUSCH transmissions, and then transmit the PUSCH. RV values ​​applied to each repeated PUSCH transmission may be determined in order, such as a, b, c, and d, according to the determined repeated PUSCH transmissions.

[0428] As shown in Figure 27, since the SRS signal, which is an uncancellable uplink signal or channel, is located at the 11th symbol in the first slot, repeated transmission of the PUSCH is possible using the remaining symbols other than the 11th symbol. Therefore, the allocation of the symbol for the second repeated transmission of the PUSCH may be determined to be one symbol later than when there is no SRS signal, depending on the symbol where the uncancellable SRS signal is located.

[0429] Then, symbol allocation for the third PUSCH repeat transmission and symbol allocation for the fourth PUSCH repeat transmission may follow. Compared to the first embodiment of FIG. 26, this method allows PUSCH repeat transmission to be performed according to the number of PUSCH repeat transmissions indicated by the DCI of the PDCCH from the base station. In addition, since there are no missing RV values ​​in the middle, high reliability can be achieved. However, in this case, latency may increase since the overall PUSCH repeat transmissions are shifted in time.

[0430] As a third embodiment, the terminal may determine the symbol on which the PUSCH repetitive transmission is performed, regardless of whether the uplink signal or channel is canceled (or dropped).

[0431] FIG. 28 illustrates yet another example of a method for determining symbols for repeated transmission of a PUSCH according to an embodiment of the present invention.

[0432] 28, if a symbol for one PUSCH repeat transmission overlaps with a symbol of an uplink signal or channel that cannot be canceled (or dropped), the PUSCH repeat transmission may not be performed in the corresponding symbol, and the uplink signal or channel that cannot be canceled (or dropped) may be transmitted. Also, if there is a canceled PUSCH repeat transmission, the subsequent PUSCH repeat transmission may be transmitted in the earliest transmittable symbol among the remaining symbols.

[0433] As shown in FIG. 28, if the second PUSCH repeat transmission (Rep#1) overlaps with a symbol for a non-cancellable SRS signal, the PUSCH repeat transmission is canceled (or dropped). After that, the symbols for transmitting the PUSCH repeat transmissions (Rep#2, Rep#3) may be determined as the earliest transmittable symbols among the remaining symbols. That is, although the third PUSCH repeat transmission (Rep#2) was originally assigned to the 13th and 14th symbols in the first slot, it may be transmitted at the 12th and 13th symbols, which are the earliest transmitted symbols after the second PUSCH repeat transmission (Rep#1) is canceled. That is, the third PUSCH repeat transmission can be transmitted one symbol earlier.

[0434] Such a method has the same reliability as the first method and has a lower delay since it is transmitted with the earliest possible symbol.

[0435] In yet another embodiment of the present invention, the base station may change the uplink beam that transmits each PUSCH repetition transmission to the terminal, because the base station may increase reliability by transmitting using different uplink beams when transmitting signals to the terminal using beamforming in a high frequency band.

[0436] This can be expressed as beam diversity. According to an embodiment of the present invention, at least one symbol gap is inserted between repeated PUSCH transmissions using different beams, thereby ensuring time for the UE to change the beam. Here, the number of symbols used in the gap may vary depending on the uplink subcarrier spacing. That is, as the uplink subcarrier spacing increases, a proportionally larger number of symbols may be used in the gap.

[0437] Another problem to be solved by the present invention relates to a method for determining the size of a transport block (TB) when transmitting PUSCH repetitions. According to TS38.214, the size of a TB may be proportional to the number of REs of a resource to which a PUSCH is allocated. That is, a PUSCH allocated with a relatively large number of REs may have a relatively large TB size. However, as described in the previous embodiment of PUSCH repetition, the number of REs that each PUSCH repetition may occupy may be different. For example, the first PUSCH repetition may occupy two symbols, and the second PUSCH repetition may occupy ten symbols. In this case, it is necessary to determine which number of REs should be used as a basis for determining the size of the TB.

[0438] A preferred embodiment of the present invention is a method for determining a TB size that enables the first PUSCH to be decodable. The reason for using PUSCH repetition is that delay time can be reduced by early decoding success. Therefore, it is important that the first PUSCH is transmitted so that it can be decodable. For this purpose, a UE can determine the TB size based on the number of REs of the first PUSCH. Generally, a UE can determine the TB size based on the minimum number of REs corresponding to PUSCH repetition whose RV (redundancy version) value is 0. However, if the TB size is always determined based on the number of REs of the first PUSCH, an optimal TB size may not be determined because the number of REs occupied by other PUSCHs is not taken into consideration.

[0439] For example, if the number of REs occupied by the first PUSCH is greater than the number of REs occupied by the second PUSCH, determining the size of the TB based on the number of REs occupied by the first PUSCH may result in a higher code rate and performance degradation due to the smaller number of REs occupied by the second PUSCH.

[0440] To solve this problem, a preferred embodiment is that if the number of REs for the first PUSCH repetition is smaller than the average number of REs for all repetitions (i.e., the number of REs for all PUSCH repetitions divided by the number of repetitions), the size of the TB is determined by the number of REs for the first PUSCH repetition; otherwise, the size of the TB for the PUSCH may be determined by the average number of REs for all repetitions.

[0441] A preferred embodiment to solve this problem is to determine the TB size based on the number of REs for the first PUSCH repetition if the TB size based on the number of REs for the first PUSCH repetition is smaller than the average of the TB sizes based on the number of REs for all repetitions (i.e., the sum of the TB sizes based on the number of REs for each PUSCH repetition divided by the number of repetitions), and otherwise determine the TB size based on the average of the TB sizes based on the number of REs for all repetitions.

[0442] Using this method, the size of the TB for repeated transmission of the PUSCH may be determined.

[0443] FIG. 29 is a flowchart illustrating an example of a method for a terminal to repeatedly transmit a PUSCH according to one embodiment of the present invention.

[0444] Referring to Figure 29, the UE may determine resources for a specific type of PUSCH repeated transmission and perform PUSCH repeated transmission. In this case, the PUSCH repeated transmission may be performed using resources consisting of remaining symbols other than ineffective symbols.

[0445] Specifically, first, the UE may receive configuration information for PUSCH transmission from the base station (S29010). At this time, the configuration information may include resource information regarding a control resource set used for the initial access procedure and / or bitmap information indicating a symbol pattern of invalid symbols.

[0446] In addition, the configuration information may further include information for indicating semi-static downlink symbols and information for indicating symbols for receiving SS / PBCH blocks.

[0447] Thereafter, the terminal may receive a PDCCH including DCI for scheduling repeated transmission of the PUSCH from the base station (S29020). The DCI may include at least one of a starting symbol index, a length, and a repetition count of the first PUSCH repetition for repeated transmission of the PUSCH.

[0448] In addition, the DCI may further include an indicator relating to whether or not bitmap information indicating invalid symbols transmitted using configuration information is applied.

[0449] Then, the UE may determine one or more invalid symbols for repeated transmission of the PUSCH (S29030). The invalid one or more symbols may include symbols corresponding to 1) to 5) above.

[0450] That is, the one or more symbols that are not valid may include the following symbols:

[0451] 1) Semi-static DL symbols and symbols for receiving SS / PBCH blocks

[0452] 2) Symbols that overlap with CORESET#0

[0453] 3) Downlink symbols of other cells

[0454] 4) Symbols that are set as invalid symbols by RRC

[0455] 5) At least G symbols after the last symbol that falls under 1) to 4).

[0456] For example, the one or more symbols that are not valid may include symbols indicated by the resource information associated with the resource set used for the initial connection procedure.

[0457] Thereafter, the terminal can repeatedly transmit the PUSCH using at least one symbol in each slot scheduled by the PDCCH, excluding the ineffective symbol (S29040).

[0458] In this case, the invalid symbols can be classified into a first type and a second type as described above, and the symbols included in the first type are always excluded from the symbols allocated for repeated transmission of the PUSCH, while the symbols included in the second type may or may not be excluded depending on the situation.

[0459] In addition, the subcarrier spacing of the gap symbol may be a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell to which the gap symbol is applied for repeated transmission of the PUSCH.

[0460] FIG. 30 is a flowchart illustrating an example of a method for a base station to repeatedly receive a PUSCH from a terminal according to one embodiment of the present invention.

[0461] 30, the base station may repeatedly receive a PUSCH from a terminal on a resource determined for a specific type of PUSCH repeated transmission. In this case, the repeated transmission of the PUSCH may be performed on a resource configured of remaining symbols other than ineffective symbols.

[0462] Specifically, first, the base station may transmit configuration information for PUSCH transmission to the terminal (S30010). At this time, the configuration information may include resource information related to a control resource set used for the initial access procedure and / or bitmap information indicating a symbol pattern of invalid symbols.

[0463] In addition, the configuration information may further include information for indicating semi-static downlink symbols and information for indicating symbols for receiving SS / PBCH blocks.

[0464] Then, the base station may transmit a PDCCH including DCI for scheduling repeated transmission of the PUSCH to the terminal (S30020). The DCI may include at least one of a starting symbol index, a length, and a repetition count of the first PUSCH repetition for repeated transmission of the PUSCH.

[0465] In addition, the DCI may further include an indicator as to whether or not bitmap information indicating invalid symbols transmitted using configuration information is applied.

[0466] Thereafter, the base station can repeatedly receive the PUSCH in at least one symbol of each slot scheduled by the PDCCH, excluding an ineffective symbol (S30030).

[0467] The invalid one or more symbols may include symbols corresponding to 1) to 5) above.

[0468] That is, the one or more symbols that are not valid may include the following symbols:

[0469] 1) Semi-static DL symbols and symbols for receiving SS / PBCH blocks

[0470] 2) Symbols that overlap with CORESET#0

[0471] 3) Downlink symbols of other cells

[0472] 4) Symbols that are set as invalid symbols by RRC

[0473] 5) At least G symbols after the last symbol that falls under 1) to 4).

[0474] For example, the one or more symbols that are not valid may include symbols indicated by the resource information associated with the resource set used for the initial connection procedure.

[0475] In this case, the invalid symbols can be classified into a first type and a second type as described above, and the symbols included in the first type are always excluded from the symbols allocated for repeated transmission of the PUSCH, while the symbols included in the second type may or may not be excluded depending on the situation.

[0476] In addition, the subcarrier spacing of the gap symbol may be a reference subcarrier spacing included in the semi-static uplink and / or downlink configuration information of the cell to which the gap symbol is applied for repeated transmission of the PUSCH.

[0477] In this manner, the base station can repeat the PUSCH only in valid symbols and receive it from the terminal.

[0478] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not limiting. For example, each component described as a single component may be implemented in a distributed form, and components described as distributed may also be implemented in a combined form.

[0479] The scope of the present invention is indicated by the claims below rather than the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0480] 100 devices 110 processors 120 Communication Module 121 Cellular communication interface card 122 Cellular communication interface card 123 Unlicensed Spectrum Communication Interface Card 130 memory 140 User Interface Section 150 display units 200 base stations 210 processor 220 Communication Module 221 Cellular communication interface card 222 Cellular communication interface card 223 Unlicensed Spectrum Communication Interface Card 230 memory

Claims

1. 1. A user equipment (UE) for use in a wireless communication system, comprising: a communication module; a processor for controlling the communication module, the processor comprising: receiving a semi-static downlink / uplink (DL / UL) configuration indicating one or more DL symbols, one or more flexible symbols, and one or more UL symbols; For physical uplink shared channel (PUSCH) repetition, determining at least one invalid symbol for the PUSCH repetition; Transmitting at least one of the PUSCH repetitions in at least one remaining symbol of a symbol set scheduled for the PUSCH repetitions, excluding the at least one ineffective symbol, wherein the at least one ineffective symbol for the PUSCH repetition is: a symbol indicated as downlink by the semi-static DL / UL configuration; Symbols indicated by the physical broadcast channel (PBCH) for control resource set #0 (CORESET #0), and The UE is configured to transmit, when the UE supports half-duplex capability, a symbol including a symbol in which the UE receives downlink transmission in a cell other than a cell in which the at least one of the PUSCH repetitions is transmitted.

2. The at least one ineffective symbol for the PUSCH repetition is 10. The UE of claim 1, further comprising a symbol for a synchronization signal / PBCH (SS / PBCH) block.

3. The UE according to claim 1 or 2, wherein the CORESET#0 is related to cell access.

4. the PUSCH repetition overlaps with a physical uplink control channel (PUCCH); Uplink control information (UCI) related to the PUCCH is transmitted via an earliest PUSCH repetition that satisfies a condition among the overlapping PUSCH repetitions among the PUSCH repetitions; The condition is the processing time for multiplexing with the UCI; and having two or more symbols; 4. The UE of claim 1, comprising:

5. 1. A method for use by a user equipment (UE) in a wireless communication system, comprising: receiving a semi-static downlink / uplink (DL / UL) configuration indicating one or more DL symbols, one or more flexible symbols, and one or more UL symbols; for physical uplink shared channel (PUSCH) repetition, determining at least one invalid symbol for the PUSCH repetition; transmitting at least one of the PUSCH repetitions in at least one remaining symbol of a symbol set scheduled for the PUSCH repetitions, excluding the at least one ineffective symbol, wherein the at least one ineffective symbol for the PUSCH repetition is: a symbol indicated as downlink by the semi-static DL / UL configuration; Symbols indicated by the physical broadcast channel (PBCH) for control resource set #0 (CORESET #0), and and including a symbol in which the UE receives downlink transmission in a cell other than a cell in which the at least one of the PUSCH repetitions is transmitted when the UE supports half-duplex capability.

6. The at least one ineffective symbol for the PUSCH repetition is The method of claim 5 , further comprising symbols for a synchronization signal / PBCH (SS / PBCH) block.

7. The method of claim 5 or 6, wherein the CORESET#0 is related to cell access.

8. the PUSCH repetition overlaps with a physical uplink control channel (PUCCH); Uplink control information (UCI) related to the PUCCH is transmitted via an earliest PUSCH repetition that satisfies a condition among the overlapping PUSCH repetitions among the PUSCH repetitions; The condition is the processing time for multiplexing with the UCI; and having two or more symbols; 8. The method of any one of claims 5 to 7, comprising:

9. 1. A base station (BS) for use in a wireless communication system, comprising: a communication module; a processor for controlling the communication module, the processor comprising: transmitting a semi-static downlink / uplink (DL / UL) configuration indicating one or more DL symbols, one or more flexible symbols, and one or more UL symbols; For physical uplink shared channel (PUSCH) repetition, determining at least one invalid symbol for the PUSCH repetition; receiving, from a user equipment (UE), at least one of the PUSCH repetitions in at least one remaining symbol excluding the at least one ineffective symbol from a symbol set scheduled for the PUSCH repetitions, wherein the at least one ineffective symbol for the PUSCH repetition is: a symbol indicated as downlink by the semi-static DL / UL configuration; Symbols indicated by the physical broadcast channel (PBCH) for control resource set #0 (CORESET #0), and A BS configured to receive, when the UE supports half-duplex capability, a downlink transmission including a symbol transmitted by the BS to the UE in a cell other than the cell from which the at least one of the PUSCH repetitions is transmitted to the UE.

10. The at least one ineffective symbol for the PUSCH repetition is 10. The BS of claim 9, further comprising symbols for a synchronization signal / PBCH (SS / PBCH) block.

11. The BS according to claim 9 or 10, wherein the CORESET#0 is related to cell access.

12. the PUSCH repetition overlaps with a physical uplink control channel (PUCCH); Uplink control information (UCI) related to the PUCCH is received via an earliest PUSCH repetition that satisfies a condition among the overlapping PUSCH repetitions among the PUSCH repetitions; The condition is the processing time for multiplexing with the UCI; and having two or more symbols; 12. The BS according to any one of claims 9 to 11, comprising:

13. 1. A method for use by a base station (BS) in a wireless communication system, comprising: transmitting a semi-static downlink / uplink (DL / UL) configuration indicating one or more DL symbols, one or more flexible symbols, and one or more UL symbols; for physical uplink shared channel (PUSCH) repetition, determining at least one invalid symbol for the PUSCH repetition; receiving from a user equipment (UE) at least one of the PUSCH repetitions in at least one remaining symbol excluding the at least one ineffective symbol from a symbol set scheduled for the PUSCH repetitions, wherein the at least one ineffective symbol for the PUSCH repetition is: a symbol indicated as downlink by the semi-static DL / UL configuration; Symbols indicated by the physical broadcast channel (PBCH) for control resource set #0 (CORESET #0), and and when the UE supports half-duplex capability, the at least one of the PUSCH repetitions includes a symbol in which the BS transmits a downlink transmission to the UE in a cell other than the cell from which the PUSCH repetition is transmitted to the UE.

14. The at least one ineffective symbol for the PUSCH repetition is The method of claim 13 , further comprising symbols for a synchronization signal / PBCH (SS / PBCH) block.

15. The method of claim 13 or 14, wherein the CORESET#0 is related to cell access.

16. the PUSCH repetition overlaps with a physical uplink control channel (PUCCH); Uplink control information (UCI) related to the PUCCH is received via an earliest PUSCH repetition that satisfies a condition among the overlapping PUSCH repetitions among the PUSCH repetitions; The condition is the processing time for multiplexing with the UCI; and having two or more symbols; 16. The method of any one of claims 13 to 15, comprising:

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