Method for transmitting uplink shared channel in wireless communication system, and device using the same

Abstract

To provide a method for repetitively transmitting a physical PUSCH to a base station by a terminal.SOLUTION: Provided is a method for transmitting, by a terminal, a PUSCH to a base station in a wireless communication system. The method comprises: a step of receiving, from a base station, an RRC signal including configuration information on a semi-static uplink symbol, a flexible symbol and a downlink symbol; a step of receiving a PDCCH for scheduling a PUSCH transmission including at least one PUSCH repetition; a step of determining whether at least one of the required number of symbols for transmitting the PUSCH repetition cannot transmit the PUSCH repetition; and a step of transmitting the PUSCH repetition to the base station on the basis of the determination of whether the PUSCH repetition cannot be transmitted. When the PUSCH repetition cannot be transmitted, at least one of the symbols is a symbol designated as a semi-static downlink symbol by the configuration information.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a new wireless communication system. Specifically, it relates to a method for transmitting an uplink shared channel in a wireless communication system and an apparatus using the same.

Background Art

[0002] After the commercialization of the fourth-generation (4G) communication system, efforts are being made to develop a new fifth-generation (5G) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is called a network communication system beyond 4G, a post-LTE system, or a new radio (NR) system. To achieve a high data transfer rate, the 5G communication system includes a system that operates using a millimeter wave (mmWave) band of 6 GHz or higher, and also includes a communication system that operates using a frequency band of 6 GHz or lower from the perspective of ensuring coverage. As a result, the implementation forms in base stations and terminals are under consideration.

[0003] The 3rd Generation Partnership Project (3GPP (registered trademark, the same hereinafter)) NR system enhances the spectral efficiency of the network and enables communication providers to provide more data and voice services through a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting a large amount of voice. The advantages of the NR system are higher throughput and lower latency on the same platform, support for frequency division duplexing (FDD) and time division duplexing (TDD), and low operating costs with an extended end-user environment and a simple architecture.

[0004] In order to mitigate the path loss of radio waves and increase the transmission distance of radio waves in the millimeter wave band, beamforming, massive multiple-input multiple-output (massive MIMO), full-dimension multiple-input multiple-output (FD-MIMO), array antennas, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large-scale antenna technologies are being discussed in 5G communication systems. In addition, in order to improve the system network, evolved small cells, advanced small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving networks, cooperative communication, coordinated multi-points (CoMP), and interference cancellation technologies are being developed in 5G communication systems.In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), and advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) have been developed.

[0005] On the other hand, in a human-centered connection network where humans generate and consume information, the Internet is evolving into an Internet of Things (IoT) network that exchanges information among distributed components such as objects. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection to a cloud server, is also emerging. To implement IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required. As a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) have been studied for connections between objects. In an IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated from connected objects to create new value in human life. Through the integration and hybridization of existing information technology (IT) with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health management, smart home appliances, and advanced medical services.

[0006] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas. The application example of cloud RAN as the big data processing technology described above is an example of the integration of 5G technology and IoT technology. Generally, mobile communication systems have been developed to provide voice services while guaranteeing user activities.

[0007] However, mobile communication systems are gradually expanding not only voice services but also data services, and now they have been developed to the extent of providing high-speed data services. However, in the current mobile communication systems where services are being provided, due to the phenomenon of resource shortage and the high-speed service demands of users, more advanced mobile communication systems are required.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] An object of an 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 PROBLEMS

[0009] In a wireless communication system according to an embodiment of the present invention, a method for a terminal to transmit a physical uplink shared channel (PUSCH) to a base station includes receiving, from the base station, a radio resource control (RRC) signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols; receiving a physical downlink control channel (PDCCH) scheduling a PUSCH transmission including at least one PUSCH repetition; determining whether at least one of the number of symbols required to transmit the PUSCH repetition is impossible to transmit the PUSCH repetition; and transmitting the PUSCH repetition to the base station based on a determination as to whether the transmission of the PUSCH repetition is impossible.

[0010] According to one aspect, when the transmission of the PUSCH repetition is impossible, it may include a case where at least one of the symbols is designated as a semi-static downlink symbol according to the configuration information.

[0011] According to one aspect, the step of transmitting the PUSCH repetition may transmit the PUSCH repetition excluding at least one symbol that is impossible to transmit the PUSCH repetition among the number of symbols required to transmit the PUSCH repetition.

[0012] According to one aspect, when the transmission of the PUSCH repetition is impossible, it may further include a case where at least one of the symbols is located before the slot boundary and at least one is located after the slot boundary.

[0013] According to one aspect, the step of transmitting the PUSCH repetition may transmit the PUSCH repetition with the earliest symbol capable of transmitting the PUSCH repetition.

[0014] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is a flexible symbol equal to or less than a critical number following a semi-static downlink symbol.

[0015] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0016] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is a flexible symbol equal to or less than a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0017] According to one aspect, it may further include a step of receiving, from the base station, information regarding at least one symbol for which the transmission of the PUSCH repetition is not possible, by means of an RRC signal, and when the transmission of the PUSCH repetition is not possible, it may further include a case where the transmission of the PUSCH repetition is indicated as not possible by the information regarding the at least one symbol from the PDCCH.

[0018] According to one aspect, the step of transmitting the PUSCH repetition may be interrupted in response to a PUSCH having the same hybrid automatic repeat request (HARQ) process number (HPN) as the PUSCH including the PUSCH repetition transmission being scheduled.

[0019] According to one aspect, the PDCCH indicates any one value from 0 to 13 as the position (S) of the start symbol of the transmission of the PUSCH, indicates any one value from 1 to 14 as the length (L) of the PUSCH for transmission, and the sum of S and L may have any one value from 1 to 27.

[0020] In a wireless communication system according to another embodiment of the present invention, a terminal that transmits a physical uplink shared channel (PUSCH) to a base station receives a radio resource control (RRC) signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols from the base station, receives a physical downlink control channel (PDCCH) that schedules a PUSCH transmission including at least one PUSCH repetition from the base station, or a communication module configured to transmit PUSCH repetitions to the base station, a memory configured to store a control program and data used in the terminal, and at least one of the number of symbols required for the transmission of the PUSCH repetition determines whether or not the transmission of the PUSCH repetition is impossible, and includes a processor configured to control the transmission of the PUSCH repetition based on a determination as to whether or not the transmission of the PUSCH repetition is impossible.

[0021] According to one aspect, when the transmission of the PUSCH repetition is impossible, it can include a case where at least one of the symbols is designated as a semi-static downlink symbol according to the configuration information.

[0022] According to one aspect, the processor can control the transmission of the PUSCH repetition to transmit the PUSCH repetition except for at least one symbol for which the transmission of the PUSCH repetition is impossible among the number of symbols required for the transmission of the PUSCH repetition.

[0023] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is located before the slot boundary and at least one is located after the slot boundary.

[0024] According to one aspect, the processor can control the transmission of the PUSCH repetition to transmit the PUSCH repetition at the earliest symbol at which the transmission of the PUSCH repetition is possible.

[0025] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is a flexible symbol equal to or less than a critical number following a semi-static downlink symbol.

[0026] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include a case where at least one of the symbols is included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0027] According to one aspect, when the transmission of the PUSCH repetition is not possible, it may further include at least one of cases where at least one of the symbols is a flexible symbol equal to or less than a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0028] According to one aspect, the communication module is further configured to receive, from the base station, information regarding at least one symbol for which transmission of the PUSCH repetition is not possible, by means of an RRC signal, and may further include a case where, when transmission of the PUSCH repetition is not possible, transmission of the PUSCH repetition is indicated to be not possible by information regarding the at least one symbol from the PDCCH.

[0029] According to one aspect, the processor may control transmission of the PUSCH repetition to interrupt transmission of the PUSCH repetition in response to a PUSCH having the same Hybrid Automatic Repeat reQuest (HARQ) process number (HPN) as the PUSCH including the PUSCH repetition being scheduled.

[0030] According to one aspect, the PDCCH may indicate any one value from 0 to 13 as the position (S) of the start symbol of transmission of the PUSCH, and may indicate any one value from 1 to 14 as the length (L) of the PUSCH for transmission, and the sum of S and L may have any one value from 1 to 27.

Advantages of the Invention

[0031] According to a method for a terminal to repeatedly transmit a PUSCH to a base station in the wireless communication system according to an embodiment of the present invention described above, by enabling the terminal to repeat the PUSCH as early as possible and repeatedly transmit it to the base station, it is possible to achieve the target performance of a 5G wireless communication system that attempts to provide a service with low delay and high reliability.

[0032] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from the following description.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0034] The terms used in this specification adopt general terms that are currently widely used as far as possible by considering the functions in the present invention. However, those terms may be changed according to the intentions of those skilled in the art, customs, and the emergence of new technologies. Further, in specific cases, there are terms arbitrarily selected by the applicant. In this case, their meanings are explained in the corresponding explanatory part of the present invention. Therefore, it is intended to clarify that the terms used in this specification should be analyzed based not only on the names of the terms but also on the substantial meanings of the terms and the content throughout this specification.

[0035] Throughout this specification and the following claims, when an element is described as being "connected" to another element, that element may well be "directly connected" to the other element or "electrically connected" to the other element through a third element. Further, unless explicitly stated to the contrary, the word "comprising" is understood to imply the inclusion of the stated elements and not to imply the exclusion of any other elements, unless otherwise specified. Moreover, limitations such as "above" or "below" based on a particular threshold may, in some exemplary embodiments, be replaced, as appropriate, with "greater than" or "less than", respectively.

[0036] The following techniques can be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier FDMA (SC-FDMA), etc. CDMA can be implemented by wireless technologies such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented by wireless technologies such as global system for mobile communications (GSM (registered trademark)) / general packet radio service (GPRS) / GSM (registered trademark) evolved enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented by wireless technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, evolved UTRA (E-UTRA). UTRA is part of the universal mobile telecommunications system (UMTS). The 3rd generation partnership project (3GPP) long term evolution (LTE) is part of the evolved UMTS (EUMTS) that uses evolved UTRA (E-UTRA), and LTE advanced (A) is an evolved version of 3GPP LTE. 3GPP new radio (NR) is a system designed separately from LTE / LTE-A and is a system for supporting services such as enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) which are requirements of IMT-2020. For the sake of clarity, mainly 3GPP NR is described, but the technical idea of the present invention is not limited thereto.

[0037] Unless otherwise specified in this specification, the base station may refer to a next-generation node B (gNB) as defined in 3GPP NR. Further, unless otherwise specified, the terminal may refer to a user equipment (UE). Hereinafter, for the sake of understanding the description, each content will be separately described as an example, but each example may be used in combination with each other. In the present disclosure, the configuration of the terminal can represent the configuration by the base station. Specifically, the base station can transmit a channel or a signal to the terminal and set the operation of the terminal or the value of the parameter used in the wireless communication system.

[0038] FIG. 1 shows an example of a wireless frame structure used in a wireless communication system.

[0039] Referring to FIG. 1, the wireless frame (or radio frame) used in the 3GPP NR system may have a length of 10 ms (Δf max N f / 100)*T c ). In addition, the wireless frame includes 10 subframes (SF: subframe) of equal size. In this specification, Δf max = 480 * 10 3 Hz, N f = 4096, T c = 1 / (Δf ref * N f,ref ), Δf ref = 15 * 10 3 Hz, and N f,ref = 2048. Numbers from 0 to 9 may be respectively assigned to the 10 subframes within one wireless frame. Each subframe has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15 * 2 μis in kHz, and μ can have values of μ = 0, 1, 2, 3, 4 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe with a length of 1 ms can contain 2 μ slots. In this case, the length of each slot is 2 -μ ms. Numbers from 0 to 2 μ -1 can be allocated to the 2 μ slots within one subframe respectively. In addition, numbers from 0 to 10*2 μ -1 can be allocated to the slots within one wireless frame respectively. The time resources can be distinguished by at least one of the wireless frame number (also called wireless frame index), subframe number (also called subframe index), and slot number (or slot index).

[0040] Figure 2 shows an example of the downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the resource grid structure of the 3GPP NR system.

[0041] Specifically, Figure 2 shows the structure of the resource grid of the 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol section. Unless otherwise specified, an OFDM symbol may simply be called a symbol. One RB contains 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, the signal transmitted from each slot is N size,μ grid,x *N RB sc subcarriers of this book and N slot symbIt may be represented by a resource grid including [[x]] OFDM symbols. Here, when the signal is a DL signal, x = DL, and when the signal is a UL signal, x = UL. N size,μ grid,x represents the number of resource blocks (RBs) according to the subcarrier spacing which is a component of μ (x is DL or UL), N slot symb represents the number of OFDM symbols in a slot. N RB sc is the number of subcarriers constituting one RB, N RB sc = 12. The OFDM symbol may be called a cyclic shift OFDM (CP - OFDM) symbol or a discrete Fourier transform spread OFDM (DFT - s - OFDM) symbol according to the multiple access scheme.

[0042] The number of OFDM symbols included in one slot may change according to the length of the cyclic prefix (CP). For example, in the case of normal CP, one slot includes 14 OFDM symbols, while in the case of extended CP, one slot may include 12 OFDM symbols. In a specific embodiment, the extended CP may be used only at a 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure may be similarly applied to slots having different numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes N size,μ grid,x *N RB sc sub - carriers of this book. The type of sub - carrier may be divided into data sub - carriers for data transmission, reference signal sub - carriers for reference signal transmission, and guard bands. The carrier frequency is also called the center frequency (fc).

[0043] One RB can be defined by N RB sc (e.g., 12) consecutive sub - carriers in the frequency domain. For reference, a resource composed of one OFDM symbol and one sub - carrier may be called a resource element (RE) or a tone. Thus, one RB can be composed of N slot symb *N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) within one slot. k can be an index assigned from 0 to N size,μ grid,x *N RB sc - 1 in the frequency domain, and l can be an index assigned from 0 to N slot symb - 1 in the time domain.

[0044] For the UE to receive signals from the base station or transmit signals to the base station, the time / frequency of the UE may be synchronized with the time / frequency of the base station. This is because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate the DL signal and transmit the UL signal at the appropriate time.

[0045] Each symbol of a radio frame used in time division duplex (TDD), i.e., asymmetric spectrum, can be composed of at least one of a DL symbol, a UL symbol, and a flexible symbol. A radio frame used as a DL carrier in frequency division duplex (FDD), i.e., symmetric spectrum, may be composed of a DL symbol or a flexible symbol, and a radio frame used as a UL carrier may be composed of a UL symbol or a flexible symbol. In a DL symbol, DL transmission is possible but UL transmission is not. In a UL symbol, UL transmission is possible but DL transmission is not. A flexible symbol can be determined to be used as DL or UL according to a signal.

[0046] Information about the type of each symbol, i.e., information representing any one of a DL symbol, a UL symbol, and a flexible symbol, can be configured using a cell-specific or common radio resource control (RRC) signal. In addition, information about the type of each symbol can be additionally configured using a UE-specific or dedicated RRC signal. The base station notifies, by using a cell-specific RRC signal, i) the period of the cell-specific slot configuration, ii) the number of slots having only DL symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of DL symbols from the first symbol of the slot immediately following the slot having only DL symbols, iv) the number of slots having only UL symbols from the end of the period of the cell-specific slot configuration, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot having only UL symbols. Here, a symbol that is not composed of either a UL symbol or a DL symbol is a flexible symbol.

[0047] When information about symbol type is configured using UE-specific RRC signals, the base station may signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of DL symbols among the N symbols of the corresponding slot for each slot, and the number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, the symbol not configured using either the UL symbol or the DL symbol is the flexible symbol. slot symb number of DL symbols among the N symbols of the corresponding slot for each slot, and the N slot symb number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, the symbol not configured using either the UL symbol or the DL symbol is the flexible symbol.

[0048] FIG. 3 is a diagram for explaining physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0049] When the power of the UE is turned on or the UE camps on a new cell, the UE performs initial cell search (S101). Specifically, the UE may synchronize with the BS during initial cell search. For this purpose, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0050] Upon completion of the initial cell search, the UE receives the physical downlink shared channel (PDSCH) according to the physical downlink control channel (PDCCH) and the information therein, as a result of which the UE can obtain system information more specific than the system information obtained through the initial cell search (S102). Here, the system information obtained by the UE is cell-common system information for the UE to operate correctly at the physical layer in Radio Resource Control (RRC), and is also referred to as Remaining system information or System information block (SIB) 1.

[0051] When the UE first accesses the base station or does not have radio resources for signal transmission, the UE may perform a random access procedure with respect to the base station (operations S103 to S106). First, the UE can transmit a preamble through the physical random access channel (PRACH) (S103), and can receive a response message for the preamble from the base station through the PDCCH and the corresponding PDSCH (S104). When a valid random access response message is received by the UE, the UE transmits data including the UE identifier and the like to the base station through the physical uplink shared channel (PUSCH) indicated by the UL grant transmitted from the base station through the PDCCH (S105). Next, the UE waits for the reception of the PDCCH as an indication of the base station for collision resolution. When the UE successfully receives the PDCCH through the UE identifier (S106), the random access process is terminated. During the random access process, the UE can obtain UE-specific system information necessary for the UE to operate correctly at the physical layer in the RRC layer. When the UE obtains the UE-specific system information in the RRC layer, the UE enters the RRC connected mode (RRC_CONNECTED mode).

[0052] The RRC layer is used for generating and managing messages for the control between the terminal and the Radio Access Network (RAN). More specifically, the base station and the terminal can perform custody management including broadcasting of cell system information necessary for all terminals in the cell, transmission management of paging messages, mobility management and handover, measurement reporting of the terminal and control thereof, terminal capability management and device management in the RRC layer. Generally, since the update of the signal transmitted in the RRC layer (hereinafter, the RRC signal) is longer than the transmission and reception cycle (that is, the transmission time interval, TTI) in the physical layer, the RRC signal can be held without changing in a long cycle.

[0053] After the procedure described above, the UE receives PDCCH / PDSCH (S107) and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. Also, the format of the DCI may vary according to the intended use. The uplink control information (UCI) transmitted by the UE to the base station through the UL includes DL / UL ACK / NACK signals, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc. Here, the CQI, PMI, and RI may be included in the Channel State Information (CSI). In the 3GPP NR system, the UE may transmit control information such as the HARQ-ACK and CSI described above through the PUSCH and / or PUCCH.

[0054] Figures 4a and 4b show SS / PBCH blocks for initial cell access in the 3GPP NR system.

[0055] When the power is turned on or when the UE wants to access a new cell, the UE may acquire time and frequency synchronization with the cell and execute an initial cell search procedure. The UE may detect the physical cell identification information NcellID of the cell during the cell search procedure. For this purpose, the UE may receive synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station and synchronize with the base station. In this case, the UE can obtain information such as cell identification information (ID).

[0056] Referring to FIG. 4a, the synchronization signal (SS) is described in more detail. The synchronization signal can be classified into PSS and SSS. The PSS can be used to obtain time domain synchronization and / or frequency domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and cell group ID. Referring to FIG. 4a and Table 1, the SS / PBCH block can be configured using 20 consecutive RBs (= 240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the minimum subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals through 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 the physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block excluding the above signals.

[0057]

Table 1

[0058] SS enables a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, where each group contains three unique identifiers through a combination of three PSSs and SSSs such that each physical layer cell ID is only part of one physical layer cell identifier group. Thus, the physical layer cell ID N cell ID = 3N (1) ID + N (2) ID is the index N ranging from 0 to 335 that indicates the physical layer cell identifier group (1) ID and the index N ranging from 0 to 2 that indicates the physical layer identifier within the physical layer cell identifier group (2) ID and can be uniquely defined thereby. The UE can detect the PSS and identify one of the three unique physical layer identifiers. Additionally, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d PSS (n) is as follows.

[0059] d PSS (n) = 1 - 2x(m)

[0060] m = (n + 43N (2) ID ) mod 127

[0061] 0 ≦ n << 127

[0062] where x(i + 7) = (x(i + 4) + x(i)) mod 2,

[0063] It is given that [x(6) x(5) x(4) x(3) x(2) x(1) x(0)] = [1 1 1 0 1 1 0].

[0064] Furthermore, the SSS sequence dSSS(n) is as follows.

[0065] d SSS (n) = [1 - 2x0((n + m0) mod 127][1 - 2x i ((n + m1) mod 127]

[0066] m0 = 15 floor (N (1) ID / 112)+5N (2) ID

[0067] m1 = N (1) ID mod 112

[0068] 0 ≤ n < 127

[0069] Here, x0(i + 7) = (x0(i + 4)+x0(i)) mod 2

[0070] x1(i + 7) = (x1(i + 1)+x1(i)) mod 2, and

[0071] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)] = [0 0 0 0 0 0 1]

[0072] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)] = [0 0 0 0 0 0 1] is given.

[0073] A radio frame with a length of 10 ms can be divided into two half - frames with a length of 5 ms. With reference to FIG. 4b, an explanation of the slot in which the SS / PBCH block is transmitted in each half - frame will be given. The slot in which the SS / PBCH block is transmitted can be any one of cases A, B, C, D, and E. In case A, the sub - carrier spacing is 15 kHz, and the start point of the SS / PBCH block is the ({2,8}+14*n)-th symbol. In this case, at carrier frequencies below 3 GHz, n = 0 or 1. In addition, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3 may be applicable. In case B, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is {4,8,16,20}+28*n. In this case, at carrier frequencies below 3 GHz, n = 0. In addition, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1 may be applicable. In case C, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is the ({2,8}+14*n)-th symbol. In this case, at carrier frequencies below 3 GHz, n = 0 or 1. In addition, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3 may be applicable. In case D, the sub - carrier spacing is 120 kHz, and the start point of the SS / PBCH block is the ({4,8,16,20}+28*n)-th symbol. In this case, at carrier frequencies of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the sub - carrier spacing is 240 kHz, and the start point of the SS / PBCH block is the ({8,12,16,20,32,36,40,44}+56*n)-th symbol. In this case, at carrier frequencies of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0074] Figures 5a and 5b illustrate procedures for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, the base station may add a cyclic redundancy check (CRC) masked (e.g., XOR operation) using a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. A common RNTI used by one or more UEs may include 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). In addition, the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Thereafter, after performing channel coding (e.g., polar coding) (S204), the base station may perform rate matching according to the amount of resources used for PDCCH transmission (S206). Thereafter, the base station may multiplex the DCI based on a control channel element (CCE)-based PDCCH structure (S208). In addition, the base station may apply additional processes such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI (S210), and then map the DCI to the resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE may include a plurality (e.g., six) of resource element groups (REGs). One REG may be configured using a plurality (e.g., twelve) of resource elements (REs). The number of CCEs used for one PDCCH may be defined as an aggregation level.In the 3GPP NR system, an aggregation level of 1, 2, 4, 8, or 16 can be used. Figure 5b is a diagram related to the CCE aggregation level and the multiplexing of the PDCCH, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control area accordingly.

[0075] Figure 6 shows a control resource set (CORESET) in which a physical downlink control channel (PDCCH) can be transmitted in the 3GPP NR system.

[0076] The CORESET is a time-frequency resource in which the PDCCH, i.e., the control signal for the UE, is transmitted. In addition, a search space, which will be described later, can be mapped to one CORESET. Therefore, the UE may monitor the time-frequency region designated as the CORESET instead of monitoring all frequency bands for PDCCH reception, and can decode the PDCCH mapped to the CORESET. The base station may configure one or more CORESETS for each cell for the UE. The CORESET can be configured using up to 3 consecutive symbols on the time axis. In addition, the CORESET can be configured in units of 6 consecutive PRBs on the frequency axis. In the embodiment of Figure 6, CORESET #1 is configured using consecutive PRBs, and CORESET #2 and CORESET #3 are configured using non-consecutive PRBs. The CORESET can be placed in any symbol within a slot. For example, in the embodiment of Figure 6, CORESET #1 starts at the first symbol of the slot, CORESET #2 starts at the 5th symbol of the slot, and CORESET #9 starts at the 9th symbol of the slot.

[0077] Figure 7 shows a method for setting a PUCCH search space in the 3GPP NR system.

[0078] To transmit PDCCH to a UE, each core set may have at least one search space. In embodiments of the present disclosure, a search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) through which a UE's PDCCH can be transmitted. The search space may include a common search space that 3GPP NR UEs are required to commonly search, and a UE-specific or terminal-specific search space that a specific UE is required to search. Among the common search spaces, a UE may monitor a PDCCH that is set so that all UEs in cells belonging to the same base station commonly search. In addition, a UE-specific search space may be set for each UE so that the UE monitors PDCCHs allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, the search spaces between UEs may be partially overlapped and allocated due to the limited control area in which the PDCCH is allocated. Monitoring the PDCCH includes seeking PDCCH candidates in the search space and blindly decoding. When the blind decoding is successful, it may be expressed that the PDCCH has been (successfully) detected / received, and when the blind decoding fails, it may be expressed that the PDCCH has not been detected / received or has not been successfully detected / received.

[0079] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI known in advance to one or more UEs to transmit DL control information to one or more UEs is called a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a UE-specific RNTI already known to a specific UE to transmit UL scheduling information or DL scheduling information to the specific UE is called a UE-specific PDCCH. The common PDCCH may be included in the common search space, and the UE-specific PDCCH may be included in the common search space or the UE-specific PDCCH.

[0080] The base station may signal to each UE or UE group through the PDCCH information related to resource allocation of the paging channel (PCH) and downlink shared channel (DL-SCH) which are transmission channels (i.e., DL grant), or information related to resource allocation of the uplink shared channel (UL-SCH) and hybrid automatic repeat request (HARQ) (i.e., UL grant). The base station may transmit the PCH transport block and DL-SCH transport block through the PDSCH. The base station may transmit data except for specific control information or specific service data through the PDSCH. In addition, the UE may receive data except for specific control information or specific service data through the PDSCH.

[0081] The base station may include in the PDCCH information about where the UE (one or more UEs) PDSCH data is to be transmitted and how the PDSCH data will be received and decoded by the corresponding UE, and may transmit the PDCCH. For example, assume that the DCI transmitted on a specific PDCCH is CRC masked using an RNTI of "A", and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency location) of "B", and indicates transmission format information of "C" (e.g., transport block size, modulation method, coding information, etc.). The UE monitors the PDCCH using the RNTI information the UE has. In this case, if there is a UE that performs blind decoding of the PDCCH using the RNTI of "A", that UE receives the PDCCH and, through the received PDCCH information, receives the PDSCH indicated by "B" and "C".

[0082] Table 2 shows an embodiment of the physical uplink control channel (PUCCH) used in a wireless communication system.

[0083]

Table 2

[0084] PUCCH can be used to transmit the following UL control information (UCI).

[0085] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0086] - HARQ-ACK: Response to the PDCCH (indicating DL SPS release) and / or response to the DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether the information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter, NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used in combination with HARQ-ACK / NACK and ACK / NACK. Generally, ACK may be represented by the bit value 1, and NACK may be represented by the bit value 0.

[0087] - Channel State Information (CSI): Feedback information on the DL channel. The UE generates it based on the CSI reference signal (RS) transmitted by the base station. Multiple-input multiple-output (MIMO)-related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by CSI.

[0088] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments, and frame structures.

[0089] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted within two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. At this time, the sequence may be a sequence that is cyclically shifted from the base sequence used for PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal is M bit bits UCI (M bit =1 or 2) can determine the cyclic shift (CS) value m cs . Also, a basic sequence of length 12 can be cyclically shifted based on the determined CS value m cs , and the cyclically shifted sequence can be mapped to 12 REs of one OFDM symbol and one RB and transmitted. The number of cyclic shifts available for the terminal is 12. When M bit =1, 1-bit UCI 0 and 1 can be mapped to two cyclically shifted sequences with a cyclic shift value difference of 6, respectively. Also, when M bit =2, 2-bit UCI 00, 01, 11, 10 can be mapped to four cyclically shifted sequences with a cyclic shift value difference of 3, respectively.

[0090] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted through OFDM symbols consecutive 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 M bit =1 is modulated by BPSK. The terminal is M bitThe UCI with value 2 is modulated by QPSK (quadrature phase shift keying). A sequence of length 12 is multiplied by the modulated complex valued symbol d(0) to obtain a signal. The terminal spreads the obtained signal with a time-domain OCC (orthogonal cover code) on the even-numbered OFDM symbol to which PUCCH format 1 is allocated and transmits it. The maximum number of different terminals multiplexed in the same RB can be determined according to the length of the OCC used for PUCCH format 1. On the odd-numbered OFDM symbol of PUCCH format 1, the DMRS (demodulation reference signal) is spread with the OCC and mapped.

[0091] PUCCH format 2 can deliver UCI exceeding 2 bits. PUCCH format 2 can be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted within two OFDM symbols, the sequences transmitted within different RBs through the two OFDM symbols may be the same as each other. Here, the sequences may be a plurality of modulated complex-valued symbols d(0),..., d(M symbol -1). Here, M symbol may be M bit / 2. Through this, the UE can obtain a frequency diversity gain. More specifically, the UCI of M bit bits (M bit >2) is bit-level scrambled, QPSK modulated, and mapped to the RBs of one or two OFDM symbols. Here, the number of RBs may be one of 1 to 16.

[0092] PUCCH format 3 or PUCCH format 4 can deliver UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 can be transmitted through 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 may be one of 4 to 14. Specifically, the UE modulates M bit bits of UCI (M bit > 2) using π / 2-2 phase shift keying (BPSK) or QPSK to generate complex-valued symbols d(0) to d(M symb - 1). Here, when using π / 2-BPSK, M symb = M bit and when using QPSK, M symb = M bit / 2. The UE does not have to apply block-level spreading to PUCCH format 3. However, the UE may apply block-level spreading to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12 such that PUCCH format 4 can have a multiplexing capacity of 2 or 4. The UE performs transmission precoding (or DFT precoding) on the spread signal, maps it to each RE, and transmits the spread signal.

[0093] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined according to the length of the UCI transmitted by the UE and the maximum code rate. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together through the PUCCH. When the number of RBs that the UE can transmit is more than the maximum number of RBs that PUCCH format 2, or PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some UCI information according to the priority of the UCI information.

[0094] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured through an RRC signal for indicating frequency hopping within a slot. When frequency hopping is configured, the index of the RBs to be frequency-hopped can be configured using the RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceil(N / 2) OFDM symbols.

[0095] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in a plurality of slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted can be configured by the RRC signal. The repeatedly transmitted PUCCH must start at a fixed-position OFDM symbol in each slot and must have a constant length. When one of the OFDM symbols of the OFDM symbols in the slot in which the UE is to transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE does not have to transmit the PUCCH in the corresponding slot and may delay the transmission of the PUCCH until the next slot for transmitting the PUCCH.

[0096] On the one hand, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). For this purpose, a BWP (bandwidth part) composed of some continuous bandwidth within the carrier bandwidth may be configured. A terminal operating by TDD or operating in an unpaired spectrum may have up to 4 DL / UL BWP pairs configured for one carrier (or cell). Also, a terminal can activate one DL / UL BWP pair. A terminal operating by FDD or operating in a paired spectrum may have up to 4 DL BWPs configured for a downlink carrier (or cell) and up to 4 UL BWPs configured for an uplink carrier (or cell). A terminal can activate one DL BWP and one UL BWP for each carrier (or cell). A terminal does not need to receive or transmit in time-frequency resources other than the activated BWP. The activated BWP can be called an active BWP.

[0097] The base station can indicate to the terminal the activated BWP among the configured BWPs by using downlink control information (DCI). The BWP indicated by the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station can include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI for scheduling PDSCH or PUSCH to change the DL / UL BWP pair of the terminal. The terminal can receive the DCI for scheduling PDSCH or PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI for scheduling PDSCH to change the DL BWP of the terminal. In the case of an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI for scheduling PUSCH to change the UL BWP of the terminal.

[0098] FIG. 8 is a conceptual diagram for explaining carrier aggregation.

[0099] Carrier aggregation is a method in which a UE uses a plurality of frequency blocks or cells (in a logical sense) configured with UL resources (or component carriers) and / or DL resources (or component carriers) as one large logical frequency band in order for a wireless communication system to use a wider frequency band. One component carrier may also be referred to by terms such as a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, hereinafter, for convenience of explanation, the term "component carrier" is used.

[0100] Referring to FIG. 8, as an example of the 3GPP NR system, the overall system bandwidth may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically continuous subcarriers. Although FIG. 8 shows that each of the component carriers has the same bandwidth, this is only an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown as being adjacent to each other on the frequency axis, the drawing is shown in a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

[0101] For each component carrier, different center frequencies may be used. Also, one common center frequency may be used in physically adjacent component carriers. In the embodiment of FIG. 8, assuming that all component carriers are physically adjacent, the center frequency A may be used in all component carriers. Further, assuming that each of the component carriers is not physically adjacent to each other, the center frequency A and the center frequency B may be used in each of the component carriers.

[0102] When the entire system bandwidth is extended by carrier aggregation, the frequency band used for communication with each UE may be defined in units of component carriers. UE A may use 100 MHz, which is the entire system bandwidth, and execute communication using all five component carriers. UE B1 to B5 can only use a 20 MHz bandwidth and can execute communication using one component carrier. UE C1 and C2 may use a 40 MHz bandwidth and execute communication using two component carriers each. The example of FIG. 8 shows the case where UEC1 uses two non-adjacent component carriers and UEC2 uses two adjacent component carriers.

[0103] FIG. 9 is a diagram for explaining single-carrier communication and multi-carrier communication. Specifically, FIG. 9(a) shows a single-carrier subframe structure, and FIG. 9(b) shows a multi-carrier subframe structure.

[0104] Referring to FIG. 9(a), in the FDD mode, a general wireless communication system may perform data transmission or data reception through one corresponding DL band and one UL band. In another specific embodiment, in the TDD mode, the wireless communication system may divide a radio frame into UL time units and DL time units in the time domain, and perform data transmission or data reception through the UL / DL time units. Referring to FIG. 9(b), three 20-MHz component carriers (CCs) may be aggregated in each of the UL and DL so that a bandwidth of 60 MHz can be supported. Each CC may be adjacent to each other in the frequency domain or may not be adjacent. FIG. 9(b) shows a case where the bandwidths of the UL CC and the DL CC are the same and symmetric, but the bandwidth of each CC can be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CCs allocated / configured to a specific UE through the RRC may be referred to as the serving DL / UL CCs of the specific UE.

[0105] The base station may communicate with the UE by activating some or all of the serving CCs of the UE, or deactivating some of the CCs. The base station can change the CCs to be activated / deactivated and can change the number of CCs to be activated / deactivated. When the base station allocates the CCs available to the UE as cell-specific or UE-specific ones, at least one of the allocated CCs can be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. One CC not deactivated by the UE is called the primary CC (PCC) or the primary cell (PCell), and the CCs that the base station can freely activate / deactivate are called the secondary CCs (SCCs) or the secondary cells (SCells).

[0106] On the one hand, 3GPP NR uses the concept that a cell manages radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CC and UL CC. A cell can be configured using only DL resources or a combination of DL resources and UL resources. When carrier aggregation is supported, the relationship between the carrier frequency of the DL resource (i.e., DL CC) and the carrier frequency of the UL resource (i.e., UL CC) may be indicated by the system information. The carrier frequency refers to the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in DL is the DL PCC, and the carrier corresponding to the PCell in UL is the UL PCC. Similarly, the carrier corresponding to the SCell in DL is the DL SCC, and the carrier corresponding to the SCell in UL is the UL SCC. According to the UE capabilities, the serving cell can be composed of one PCell and zero or more SCells. For a UE in the RRC_CONNECTED state but not configured for or not supporting carrier aggregation, there is only one serving cell composed of only the PCell.

[0107] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" that refers to several geographical areas where communication services are provided by one base station or one antenna group. That is, one component carrier may also be called a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, in order to distinguish between the cell referring to several geographical areas and the cell of carrier aggregation in this disclosure, the cell of carrier aggregation is called a CC, and the cell of the geographical area is called a cell.

[0108] FIG. 10 is a diagram showing an example to which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, a control channel transmitted through a first CC may schedule a data channel transmitted through the first CC or the 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 in a PDCCH area of the scheduling cell schedules a PDSCH / PUSCH of the scheduled cell. That is, a search area for a plurality of component carriers exists in the PDCCH area of the scheduling cell. The PCell may basically be a scheduling cell, and a specific SCell may be designated as a scheduling cell by a higher layer.

[0109] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is the DL PCC (or, PCell), and DL component carriers #1 and #2 are DL SCCs (or, SCell). In addition, it is assumed that the DL PCC is set to the PDCCH that monitors the CC. When cross-carrier scheduling is not configured by UE-specific (or UE-group-specific or cell-specific) upper layer signaling, the CIF is disabled, and each DL CC can transmit only the PDCCH for scheduling its PDSCH without using the CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE-group-specific or cell-specific) upper layer signaling, the CIF is enabled, and a specific CC (for example, the DL PCC) may transmit not only the PDCCH for scheduling the PDSCH of DL CC A using the CIF but also the PDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling). On the other hand, the PDCCH is not transmitted in another DL CC. Therefore, the UE monitors the PDCCH without the CIF to receive the self-carrier scheduled PDSCH or monitors the PDCCH with the CIF to receive the cross-carrier scheduled PDSCH according to whether cross-carrier scheduling is configured for the UE.

[0110] On the other hand, FIGS. 9 and 10 show the subframe structure of the 3GPP LTE-A system, and the same or similar configuration may be applied to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 may be replaced with slots.

[0111] FIG. 11 is a block diagram showing the configurations of a terminal and a base station according to an embodiment of the present disclosure. In an embodiment of the present disclosure, the terminal can be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal can also be referred to as a UE (User Equipment), STA (Station), MS (Mobile Subscriber), etc. Further, in an embodiment of the present disclosure, the base station controls and manages a cell corresponding to a service area (for example, a macro cell, a femto cell, a pico cell, etc.) and can have functions such as signal transmission, channel designation, channel monitoring, self-diagnosis, and relaying. The base station can also be referred to as a gNB (next Generation Node B) or an AP (Access Point).

[0112] As shown in the figure, a terminal 100 according to an embodiment of the present disclosure can include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display unit 150.

[0113] First, the processor 110 can execute various instructions or programs and process data inside the terminal 100. Also, the processor 110 can control the overall operations including each unit of the terminal 100 and control data transmission and reception between the units. Here, the processor 110 may be configured to perform the operations according to the embodiments described in the present disclosure. For example, the processor 110 can receive slot configuration information, determine the configuration of the slot based on this, and perform communication according to the determined slot configuration.

[0114] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 can be provided with a plurality of network interface cards (NICs), such as cellular communication interface cards 121 and 122 and unlicensed band communication interface cards 123, in a built-in or external form. In the figure, the communication module 120 is shown as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application, different from the drawing.

[0115] The cellular communication interface card 121 can transmit and receive wireless signals with at least one of the base station 200, an external device, and a server using a mobile communication network, and provide cellular communication services in a first frequency band based on the instructions of the processor 110. According to one embodiment, the cellular communication interface card 121 can include at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 121 can perform cellular communication with at least one of the base station 200, an external device, and a server independently according to the cellular communication standard or protocol of the frequency band less than 6 GHz supported by the NIC module.

[0116] The cellular communication interface card 122 can transmit and receive wireless signals with at least one of the base station 200, external device, and server using a mobile communication network, and can provide cellular communication services in a second frequency band based on the instructions of the processor 110. According to one embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, external device, and server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the NIC module.

[0117] The unlicensed band communication interface card 123 transmits and receives wireless signals with at least one of the base station 200, external device, and server using a third frequency band that is an unlicensed band, and provides communication services in the unlicensed band based on the instructions of the processor 110. The unlicensed band communication interface card 123 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a 2.4 GHz or 5 GHz band. At least one NIC module of the unlicensed band communication interface card 123 can perform wireless communication with at least one of the base station 200, external device, and server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0118] Next, the memory 130 stores the control program used in the terminal 100 and various data thereby. Such a control program may include a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external device, and server.

[0119] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. Also, the user interface 140 can perform output based on the instructions of the processor 110 using various output means.

[0120] Next, the display unit 150 outputs various images on the display screen. The display unit 150 can output various display objects such as content executed by the processor 110 or a user interface based on the control instructions of the processor 110.

[0121] Also, the base station 200 according to an embodiment of the present disclosure can include a processor 210, a communication module 220, and a memory 230.

[0122] First, the processor 210 can execute various instructions or programs and process data inside the base station 200. Also, the processor 210 can control the overall operation including each unit of the base station 200 and control data transmission and reception between units. Here, the processor 210 may be configured to perform the operations according to the embodiments described in the present disclosure. For example, the processor 210 can signal slot configuration information and perform communication according to the signaled slot configuration.

[0123] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 may include a plurality of network interface cards such as cellular communication interface cards 221 and 222 and a license-free band communication interface card 223 in a built-in or external form. In the figure, the communication module 220 is shown as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application, different from the drawing.

[0124] The cellular communication interface card 221 can transmit and receive wireless signals with at least one of the above-described terminal 100, external device, and server using a mobile communication network, and provide a cellular communication service in a first frequency band based on an instruction from the processor 210. According to an example embodiment, the cellular communication interface card 221 may include at least one NIC module using a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 can perform cellular communication with at least one of the terminal 100, external device, and server independently according to a cellular communication standard or protocol in a frequency band less than 6 GHz supported by the NIC module.

[0125] The cellular communication interface card 222 can transmit and receive wireless signals with at least one of the terminal 100, an external device, and a server using a mobile communication network, and provide cellular communication services in a second frequency band based on the instructions of the processor 210. According to one embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the terminal 100, an external device, and a server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the NIC module.

[0126] The unlicensed band communication interface card 223 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a third frequency band that is an unlicensed band, and provides communication services in the unlicensed band based on the instructions of the processor 210. The unlicensed band communication interface card 223 can include at least one NIC module using an unlicensed band. For example, the unlicensed band can be a band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensed band communication interface card 223 can perform wireless communication with at least one of the terminal 100, an external device, and a server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0127] The terminal 100 and the base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present disclosure, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-described elements of the device may be mounted as one chip or as a plurality of chips depending on the device design. Also, some components of the terminal 100, for example, the user interface 140 and the display unit 150, etc., may be selectively provided in the terminal 100. Further, the user interface 140 and the display unit 150, etc., may be further provided in the base station 200 as necessary.

[0128] Reception of SSB in SMTC

[0129] An exemplary problem to be addressed in the present invention relates to the reception of SSB in SMTC. The terminal in this embodiment corresponds to the terminal 100 in FIG. 11. Therefore, each operation of the terminal in this embodiment may be performed by the processor 110 or the communication module 120 of the terminal 100. The base station in this embodiment corresponds to the base station 200 in FIG. 11. Therefore, each operation of the base station in this embodiment may be performed by the processor 210 or the communication module 220 of the base station 200.

[0130] The terminal must be able to measure without a measurement gap when the SSB is completely included in the active bandwidth part of the terminal. When the subcarrier interval of the measurement signal is different from that of the PDSCH / PDCCH or in the frequency range FR2, there may be limitations in scheduling flexibility.

[0131] More specifically, when the subcarrier spacing of the measurement signal in frequency range FR1 is the same as that of PDSCH / PDCCH, there is no restriction on scheduling availability. When the subcarrier spacing of the measurement signal in frequency range FR1 is different from that of PDSCH / PDCCH, the following scheduling availability restrictions may exist. First, if the terminal is capable of receiving SSB (synchronization signal block) and data signals with different subcarrier spacings (i.e., if the terminal supports simultaneousRxDataSSB-DiffNumerology), there is no restriction on scheduling availability. Conversely, if the terminal is not capable of receiving SSB (synchronization signal block) and data signals with different subcarrier spacings (i.e., if the terminal does not support simultaneousRxDataSSB-DiffNumerology), the terminal has restrictions on scheduling availability. In this case, the following scheduling availability restrictions are applied for SS-RSRP / RSRQ / SINR measurement.

[0132] 1) If deriveSSB_IndexFromCell is enabled, the terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on consecutive SSB symbols within the SMTC (SSB Measurement time configuration) window and the symbol immediately before and the symbol immediately after these consecutive SSB symbols.

[0133] 2) If deriveSSB_IndexFromCell is disabled, the terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on all symbols within the SMTC (SSB Measurement time configuration) window.

[0134] Here, deriveSSB_IndexFromCell indicates whether the UE can use the timing of a cell with the same SSB frequency and subcarrier spacing to derive the SSB index of the cell for the indicated SSB frequency and subcarrier spacing.

[0135] For SS-RSRP / SINR measurement in frequency range FR2, apply the following scheduling availability restrictions.

[0136] 1) The terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on consecutive SSB symbols within the SMTC (SSB Measurement time configuration) window and the symbol immediately before and the symbol immediately after these consecutive SSB symbols.

[0137] For SS-RSRQ measurement in frequency range FR2, apply the following scheduling availability restrictions.

[0138] 1) The terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on consecutive SSB symbols, RSSI measurement symbols within the SMTC (SSB Measurement time configuration) window and the symbol immediately before and the symbol immediately after these consecutive SSB / RSSI symbols.

[0139] In the above description, the SMTC window follows smtc2 when smtc2 is configured by the upper layer, and follows smtc1 otherwise.

[0140] The problem to be addressed in the present invention is to determine the slots for retransmitting the PUCCH in accordance with the scheduling availability restrictions when there are restrictions on the scheduling availability for the terminal to receive the measurement signal. More specifically, when the terminal is configured to transmit the PUCCH by repeating it K times, the terminal must determine the K slots for repeating the transmission of the PUCCH.

[0141] Suppose that the terminal is configured with carrier aggregation or dual connectivity in which two or more cells are aggregated and transmitted. For the sake of convenience, assume that it is configured with two cells. The following description to be described later is also applicable when it is configured with two or more cells. Let one of the two cells be the Pcell. The Pcell is the cell in which the terminal transmits the PUCCH. Let the other cell of the two cells be the Scell. The Scell is the cell in which the terminal does not transmit the PUCCH. A measurement signal may be configured in the Scell.

[0142] A MeasObjectNR IE (information element) may be configured in the terminal from a higher layer. The MeasObjectNR IE contains information for intra / inter-frequency measurement. The ssbFrequency included in the MeasObjectNR IE indicates the frequency of the SSB, the ssbFrequencySpacing indicates the subcarrier spacing of the SSB, and the ssb-ToMeasure indicates information regarding the time-domain configuration of the SSB to be measured. The smtc1 or smtc2 included in the MeasObjectNR IE indicates the configuration of the SMTC window.

[0143] As an example of the present invention, when the terminal is configured to repeatedly transmit PUCCH in K slots, the method for the terminal to determine the K slots for transmitting PUCCH is as follows. As a first method, when the symbol assigned for PUCCH transmission in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) within the SMTC window, the terminal does not include the slot in the K slots for transmitting PUCCH. As a second method, when the symbol assigned for PUCCH transmission in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) and the immediately following symbol within the SMTC window, the terminal does not include the slot in the K slots for transmitting PUCCH. As a third method, when the symbol assigned for PUCCH transmission in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) and the immediately following symbol or the immediately preceding symbol within the SMTC window, the terminal does not include the slot in the K slots for transmitting PUCCH. Further, the above operation can be applied only when the scheduling availability is limited.

[0144] As yet another embodiment of the present invention, the terminal is configured to repeatedly transmit PUCCH in K slots. After determining the K slots for transmitting PUCCH, the PUCCH transmission within the SMTC window is as follows. As a first method, when the symbol to which PUCCH transmission is assigned in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) within the SMTC window and the symbol immediately following the measurement signal, the terminal does not transmit the PUCCH in that slot. As a second method, when the symbol to which PUCCH transmission is assigned in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) within the SMTC window and the symbol immediately following the measurement signal, the terminal does not transmit the PUCCH in that slot. As a third method, when the symbol to which PUCCH transmission is assigned in one slot overlaps with the measurement signal (SSB configured in MeasObjectNR) and the symbol immediately following or immediately preceding the measurement signal within the SMTC window, the terminal does not transmit the PUCCH in that slot. Further, the above operation is applicable only when the scheduling availability is limited.

[0145] Still another problem to be solved by the present invention is to determine slots for PUCCH retransmission in a situation where the terminal has only half-duplex capability. If the terminal has only half-duplex capability, the terminal cannot transmit and receive simultaneously. That is, when the terminal transmits in one cell, it cannot receive in other cells. Also, when the terminal receives in one cell, it cannot transmit in other cells. Therefore, on the terminal side, it must operate in only one direction of transmission or reception. More specifically, the problem to be solved is a method for the terminal to determine K slots for retransmitting PUCCH when there is a measurement signal to be received by the terminal in the Pcell / Scell and the terminal is configured to retransmit PUCCH in K slots in the Pcell. If the terminal determines K slots for transmitting PUCCH in the Pcell without considering the measurement signal to be received by the terminal in the Pcell / Scell, the terminal must transmit PUCCH in the Pcell in some slots and must receive the measurement signal in the Pcell / Scell. This is an operation possible for a terminal with full-duplex capability but impossible for a terminal with only half-duplex capability. For this reason, the terminal must consider the measurement signal of the Pcell / Scell in order to determine the slots for transmitting PUCCH.

[0146] As a preferred embodiment of the present invention, there is provided a method for a terminal with half-duplex capability to determine K slots for retransmitting PUCCH, wherein when the symbol to which PUCCH transmission is assigned in one slot overlaps with the measurement signal of the Pcell / Scell within the SMTC window, the terminal may exclude the slot from the K slots for retransmitting PUCCH.

[0147] As a preferred embodiment of the present invention, a method for a terminal with half-duplex capability to determine K slots for repeatedly transmitting PUCCH, wherein when the symbol assigned for PUCCH transmission in one slot overlaps with the measurement signal of Pcell / Scell and the immediately following one symbol within the SMTC window, the said slot may be excluded from the K slots for repeatedly transmitting PUCCH.

[0148] As a preferred embodiment of the present invention, a method for a terminal with half-duplex capability to determine K slots for repeatedly transmitting PUCCH, wherein when the symbol assigned for PUCCH transmission in one slot overlaps with the measurement signal of Pcell / Scell and the immediately following one symbol or the immediately preceding one symbol within the SMTC window, the said slot may be excluded from the K slots for repeatedly transmitting PUCCH.

[0149] Here, the measurement signal may include the SSB configured in MeasObjectNR. Also, the measurement signal may include the CSI-RS configured in MeasObjectNR. Here, the CSI-RS may be configured through csi-rs-ResourceConfigMobility among the MeasObjectNR IEs.

[0150] PUSCH Repeated Transmission

[0151] In enhanced ultra reliable low latency communication (eURLLC) being developed in 3GPP NR release 16, various technologies for providing services with low latency and high reliability are being discussed. In particular, in the case of the uplink, in order to reduce the latency and increase the reliability, the terminal is planned to support a method of repeatedly transmitting the physical uplink shared channel (PUSCH) to the base station as soon as possible. According to one aspect of the present invention, a method in which the terminal repeatedly transmits the physical uplink shared channel as soon as possible is disclosed.

[0152] Generally, the terminal receives the scheduling information of the PUSCH from the base station. Such scheduling information of the PUSCH can be received, for example, from the PDCCH (or DCI). The terminal transmits the PUSCH in the uplink based on the received scheduling information. At this time, from the time domain resource assignment (TDRA) and the frequency domain resource assignment (FDRA) for PUSCH transmission included in the DCI, the time-frequency resource in which the PUSCH is transmitted can be known. The time resource in which the PUSCH is transmitted is composed of consecutive symbols, and one PUSCH is not scheduled across slot boundaries.

[0153] In 3GPP NR Release 15, support for inter-slot repeated transmission of PUSCH is provided. First, the number of repeated transmissions may be set by the base station for the terminal. Let the value of the number of repeated transmissions set for the terminal be K. When the terminal receives a PDCCH (or DCI) that schedules PUSCH in slot n and is instructed to transmit PUSCH in slot n + k, the terminal can transmit PUSCH in K consecutive slots starting from slot n + k. That is, PUSCH can be transmitted in slots n + k, n + k + 1,..., n + k + K - 1. And the time and frequency resources in which PUSCH is transmitted in each slot are the same as those indicated by the DCI. That is, PUSCH may be transmitted in the same symbol and the same PRB in the slot. To obtain a diversity gain in the frequency domain, frequency hopping may be set for the terminal. Frequency hopping can be set to intra-slot frequency hopping that performs frequency hopping within a slot and inter-slot frequency hopping that performs frequency hopping for each slot. If intra-slot frequency hopping is set for the terminal, the terminal divides PUSCH in the time domain into two halves in each slot. One half is transmitted in the scheduled PRB, and the other half is transmitted in the PRB obtained by adding an offset value to the scheduled PRB. Here, the offset value may be set to two values or four values at the upper layer, and any one of these values may be indicated by the DCI. If inter-slot frequency hopping is set for the terminal, the terminal transmits PUSCH in the scheduled PRB in odd-numbered slots in which PUSCH is transmitted, and transmits PUSCH in the 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 the symbol in which PUSCH should be transmitted in a specific slot is composed of semi-static DL symbols, the terminal does not transmit PUSCH in that slot.PUSCHs that could not be transmitted are not deferred to other slots for transmission.

[0154] The reasons why the above-mentioned Release 15 retransmission is not suitable for providing the eURLLC service are as follows.

[0155] First, it is difficult to provide high reliability. For example, if one slot consists of 14 symbols and the PUSCH is transmitted in symbols 12 and 13, it will be repeatedly transmitted in symbols 12 and 13 in the next slot as well. Since it does not transmit even though it can be transmitted in symbols 1 to 11 in the next slot, it is difficult to obtain high reliability.

[0156] Next, it is difficult to provide high low latency. For example, assume that one slot consists of 14 symbols and the PUSCH is transmitted in symbols 0 to 13 in order to obtain high reliability. In order for the base station to successfully receive the PUSCH, it must receive the last symbol of the PUSCH, that is, symbol 13. Therefore, there is a problem that the delay time increases depending on the length of the PUSCH.

[0157] As a method for solving this, according to one aspect of the present invention, a method for repeatedly transmitting the PUSCH within one slot is disclosed. More specifically, the terminal can continuously repeat and transmit the scheduled PUSCH. The term "continuous" means that the PUSCH is further transmitted from the symbol immediately after one PUSCH ends. Such a method can be called mini-slot-level PUSCH repetition, and the above-mentioned Release 15 repetition method of 3GPP NR can be called slot-level PUSCH repetition method.

[0158] In mini-slot-level PUSCH repetition, the problems in the above-mentioned slot-level PUSCH repetition method can be solved.

[0159] First, high reliability can be provided. For example, if one slot is composed of 14 symbols and PUSCH is transmitted in symbols 12 and 13, then in the next slot, it is repeatedly transmitted in symbols 1 and 2. Therefore, since it is transmitted continuously immediately, high reliability can be obtained.

[0160] However, it is difficult to provide high low latency. For example, assume that one slot is composed of 14 symbols and PUSCH is transmitted in symbols 0 to 1 to obtain high reliability. Since it is repeatedly transmitted within the slot, it may be transmitted again in symbols 2 to 3 and repeatedly transmitted in symbols 4 to 5. Therefore, a reliability similar to transmitting PUSCH with a slot length of 14 can be obtained. However, in this case, depending on the channel situation, the base station may succeed in reception not only after receiving all the repeated transmissions, but may succeed during the repeated transmissions. Therefore, depending on the situation, the latency time can be reduced by succeeding in reception after symbol 2 where the first repeated transmission ends.

[0161] An exemplary problem to be solved in the present invention relates to the case where mini-slot-level PUSCH repeated transmission continues to be repeatedly transmitted in other slots across slots. As described above, in the case of mini-slot-level PUSCH repeated transmission, the repeated transmission of the next PUSCH starts from the symbol immediately after one PUSCH transmission ends. However, in the following situations, there may be cases where continuous transmission is not possible.

[0162] The first situation to consider is when, when transmitting PUSCH from the symbol immediately after the symbol where PUSCH transmission ends, a semi-static DL symbol overlaps with the symbol occupied by PUSCH. In this case, since the symbol where PUSCH is to be transmitted overlaps with the semi-static DL symbol, transmission cannot be performed from the immediately subsequent symbol. Therefore, PUSCH must be repeatedly transmitted in other symbols.

[0163] The second situation to be considered is when PUSCH is transmitted from the symbol immediately following the symbol at the end of PUSCH transmission and PUSCH crosses the slot boundary. It is not allowed for one PUSCH to cross the slot boundary, and PUSCH must be transmitted in other symbols.

[0164] According to one aspect of the present invention, a PUSCH retransmission method considering the above situation is disclosed.

[0165] According to one embodiment of the present invention, when the terminal is set to perform mini-slot-level PUSCH retransmission, it transmits PUSCH in the symbol immediately following one PUSCH transmission. At this time, if PUSCH is not transmitted (as described above, for example, when the symbol where PUSCH is to be transmitted overlaps with a semi-static DL symbol or crosses the slot boundary), the terminal can transmit PUSCH in the earliest symbol where transmission is possible, or perform PUSCH retransmission excluding the symbols where PUSCH retransmission is not possible. Here, the earliest symbol where transmission is possible refers to, for example, the case where PUSCH does not overlap with a semi-static DL symbol and does not cross the slot boundary.

[0166] FIG. 12 is a flowchart showing a method by which a terminal retransmits PUSCH to a base station in a wireless communication system according to an embodiment. The base station in FIG. 12 may be the base station 200 according to FIG. 11, and the terminal in FIG. 12 may be the terminal 100 according to FIG. 11. Therefore, each operation of the terminal in this embodiment may be performed by the processor 110 or the communication module 120 of the terminal 100, and each operation of the base station in this embodiment may be performed by the processor 210 or the communication module 220 of the base station 200.

[0167] As shown in FIG. 12, the terminal receives a radio resource control (RRC) signal from the base station (S1200). The RRC signal can include configuration information regarding semi-static downlink symbols. Such configuration information can designate a specific symbol as a semi-static downlink symbol.

[0168] As described above, the terminal may be configured to transmit the PUSCH, for example, K times repeatedly by the base station. When the terminal is configured to repeatedly transmit the PUSCH, from a data perspective, the data included in the PUSCH (for example, at least one transport block (TB)) may be repeatedly transmitted identically. For reference, in the present invention, repeatedly transmitting the PUSCH does not mean that the terminal re-transmits the TB due to a reception failure at the base station.

[0169] For convenience, in the present invention, when the PUSCH is configured to be repeatedly transmitted, the repeatedly transmitted PUSCH is referred to as a PUSCH repetition. In other words, when the PUSCH is configured to be repeatedly transmitted, for example, K times, the terminal transmits a PUSCH composed of K PUSCH repetitions.

[0170] The terminal determines whether at least one of the number of symbols required to transmit each PUSCH repetition cannot be used for transmitting the PUSCH repetition (S1210). A symbol in the case where the PUSCH repetition cannot be transmitted can be called an invalid symbol for the PUSCH repetition, that is, the terminal can determine an invalid symbol for each PUSCH repetition. In the PUSCH repetition at the mini-slot level, the number of symbols required for the PUSCH repetition is a predetermined number of symbols immediately after the symbols where the previous PUSCH repetition was transmitted.

[0171] When PUSCH retransmission is not possible, for example, it includes the case where at least one of the symbols required for transmitting PUSCH retransmission is a symbol designated as a semi-static downlink symbol by the configuration information included in the RRC signal. That is, the symbol indicated as a downlink symbol by the RRC signal may be considered as an invalid symbol for PUSCH retransmission. According to one aspect, when PUSCH transmission is not possible, it may further include the case where at least one of the symbols required for transmitting the PUSCH retransmission is located before the slot boundary and at least one is located after the slot boundary. Also, according to one aspect, the terminal can also receive from the base station information regarding at least one symbol for which PUSCH retransmission is not possible through the RRC signal (S1200). When PUSCH retransmission is not possible, it may include the case where it is indicated that PUSCH retransmission is not possible based on the information regarding at least one symbol for which PUSCH retransmission is not possible received through the RRC signal from the PDCCH that schedules PUSCH. That is, the terminal can also perform settings for the case where PUSCH retransmission is not possible according to upper layer (e.g., RRC layer) parameters.

[0172] On the other hand, in FIG. 12, the transmission of the RRC signal including the configuration information regarding the semi-static DL symbol and / or the information regarding the symbol for which PUSCH retransmission is not possible in step S1200 is shown as one step for convenience. However, the signaling timing of the configuration information regarding the semi-static DL symbol and the information regarding the symbol for which PUSCH retransmission is not possible may be the same, or the configuration information regarding the semi-static DL symbol and the information regarding the symbol for which PUSCH retransmission is not possible may be signaled at different times, respectively.

[0173] Referring back to FIG. 12, when it is determined whether or not each PUSCH repetition can be transmitted, the terminal performs each PUSCH repetition transmission to the base station based on such a determination (S1220). For example, the terminal can transmit PUSCH repetitions except for at least one symbol in which PUSCH repetitions cannot be transmitted. Or, the terminal can also transmit PUSCH repetitions at the earliest symbol at which PUSCH repetitions can be transmitted.

[0174] FIG. 13 is a diagram for explaining the relationship between downlink symbols, slot boundaries, and PUSCH repetitions. Referring to FIG. 13, for example, suppose that the terminal is set to transmit by repeating 4 times with mini-slot-level PUSCH repetitions and is instructed to transmit PUSCH over 4 symbols starting from the 5th symbol of the slot from the PDCCH (or, DCI). In the figure, D, U, and F indicate downlink symbols, uplink symbols, and flexible symbols in the semi-static DL / UL configuration. According to an embodiment of the present invention, the terminal can transmit PUSCH repetitions at symbols 5, 6, 7, and 8 of the slot and check whether or not PUSCH repetitions can be transmitted at the immediately following symbols 9, 10, 11, and 12. If transmission is possible (i.e., for example, it does not overlap with the semi-static DL symbol and does not cross the slot boundary), the terminal can transmit PUSCH repetitions at symbols 9, 10, 11, and 12. The PUSCH starting from the next symbol 13 cannot be transmitted because it crosses the slot boundary and overlaps with the semi-static DL symbol. The next symbols that can be transmitted are symbols 3, 4, 5, and 6 of the next slot. These symbols are flexible symbols and transmission is possible. Therefore, the third PUSCH repetition is transmitted at these symbols. The fourth PUSCH repetition is transmitted at the next symbols 7, 8, 9, and 10. Since the terminal has completed the transmission of 4 PUSCH repetitions, it does not transmit by repeating any further.

[0175] FIG. 14 is a diagram for explaining the relationship between flexible symbols equal to or less than a critical number following semi-static DL symbols and PUSCH repetitions. According to one aspect of the present invention, when a predetermined symbol cannot transmit PUSCH repetitions, it can include a case where at least one of the symbols required to transmit PUSCH repetitions is a flexible symbol equal to or less than a critical number following semi-static downlink symbols.

[0176] More specifically, according to an embodiment of the present invention, when the terminal is set to transmit mini-slot-level PUSCH repetitions, the terminal can transmit PUSCH repetitions in the symbol immediately after 1 PUSCH repetition transmission. At this time, if the PUSCH repetition cannot be transmitted (for example, when overlapping with X flexible symbols immediately after a semi-static DL symbol, or crossing a slot boundary), the terminal can transmit PUSCH repetitions excluding the symbols where the PUSCH repetition cannot be transmitted, or transmit PUSCH repetitions at the earliest symbol when transmission is possible. Here, the earliest symbol when transmission is possible refers to the case where the PUSCH repetition does not overlap with a semi-static DL symbol, does not overlap with X flexible symbols immediately after a semi-static DL symbol, and does not cross the slot boundary. Referring to FIG. 14, suppose the terminal is set to transmit 4 repetitions of mini-slot-level PUSCH repetitions and is instructed to transmit PUSCH over 4 symbols starting from the 5th symbol of the slot from the PDCCH (or DCI). In the figure, D, U, F indicate a downlink symbol, an uplink symbol, and a flexible symbol in a semi-static DL / UL setting. According to an embodiment of the present invention, the terminal can transmit PUSCH repetitions in symbols 5, 6, 7, 8 of the slot and can check whether PUSCH repetition transmission is possible in the immediately following symbols 9, 10, 11, 12. If transmission is possible (that is, does not overlap with a semi-static DL symbol, does not overlap with X flexible symbols immediately after a semi-static DL symbol, and does not cross the slot boundary), the terminal can transmit PUSCH repetitions in symbols 9, 10, 11, 12. The PUSCH repetition starting from the next symbol 13 crosses the slot boundary and overlaps with a semi-static DL symbol, so it cannot be transmitted. FIG. 14(a) shows the case where X = 1, and FIG. 14(b) shows the case where X = 2. Referring to FIG. 14(a), the next symbols when transmission is possible are symbols 4, 5, 6, 7 of the next slot. Since these symbols are flexible symbols, transmission is possible. Therefore, the third PUSCH repetition is transmitted with these symbols.Next, the PUSCH repetition is transmitted repeatedly using symbol 8, symbol 9, symbol 10, and symbol 11. Since the terminal has completed transmitting the PUSCH repetition four times, it will not transmit any further repetitions. Referring to FIG. 14(b), the next symbols available for transmission are symbol 5, symbol 6, symbol 7, and symbol 8 in the next slot. Since these symbols are flexible symbols or semi-static UL symbols, transmission is possible. Therefore, the third PUSCH repetition is transmitted using these symbols. The fourth PUSCH repetition is transmitted at the next symbol 9, symbol 10, symbol 11, and symbol 12. Since the terminal has completed transmitting four repetitions, it will not transmit any further repetitions.

[0177] According to an aspect of the present invention, when a predetermined symbol cannot transmit a PUSCH repetition, at least one of the symbols required to transmit the PUSCH repetition may be included in a synchronization signal (SS) / physical broadcast channel (PBCH) block, or at least one of the symbols may be a flexible symbol equal to or less than a critical number following the SS / PBCH block.

[0178] More specifically, according to an embodiment of the present invention, when an SS / PBCH block is set in a cell that transmits a PUSCH repetition, or when an SS / PBCH block for measurement is set in another cell and measurement must be performed, the terminal can process the symbol corresponding to the SS / PBCH block as the same as a semi-static DL symbol. For example, in addition to the case where a PUSCH repetition cannot be transmitted in the previous embodiment, such as overlapping with X flexible symbols immediately following a semi-static DL symbol or crossing a slot boundary, when a PUSCH repetition cannot be transmitted, it may include a symbol overlapping with the SS / PBCH block and X flexible symbols immediately following the symbol overlapping with the SS / PBCH block.

[0179] As described above, a terminal configured to transmit PUSCH repeatedly K times according to an embodiment of the present invention can postpone PUSCH repetition until it finds a transmitable symbol until it transmits PUSCH repetition K times. However, postponing PUSCH repetition for too long is not consistent with the synchronization that supports mini-slot-level PUSCH repetition. In other words, although mini-slot-level PUSCH repetition is a method for supporting the uplink URLLC service, if PUSCH repetition is postponed for too long, it will violate the requirements already required by the URLLC service. Also, due to the operation of postponing PUSCH repetition for too long and then transmitting PUSCH repetition, the base station cannot use the corresponding resources for other terminals, resulting in waste of network resources. Therefore, yet another problem to be solved by the present invention relates to the condition for ending transmission in mini-slot-level PUSCH repetition.

[0180] According to an embodiment of the present invention, when a terminal with mini-slot-level PUSCH repetition configured transmits PUSCH repetition, it can end transmission under the following conditions. For example, the processor 110 of the terminal 100 in FIG. 11 is configured to control the transmission of PUSCH repetition by the communication module 120, and can control the transmission of PUSCH repetition to interrupt the transmission of PUSCH repetition when at least one of the following conditions is met. Also, for example, the step (S1220) of performing PUSCH repetition transmission in FIG. 12 may be interrupted when at least one of the following conditions is met.

[0181] FIG. 15 is a diagram for explaining the transmission end condition of PUSCH repetition.

[0182] As a first termination condition, the PUSCH repetition may be interrupted in response to a PUSCH having the same Hybrid Automatic Repeat reQuest (HARQ) process number (HPN) as the PUSCH repetition to be transmitted being scheduled. That is, the terminal may interrupt the repetition of the previous PUSCH when a new PUSCH having the same HPN as the repeatedly transmitted PUSCH repetition is scheduled. More specifically, referring to FIG. 15(a), when scheduling the repeatedly transmitted PUSCH, the scheduling information includes HPN = i. If another Physical Downlink Control Channel (PDCCH) (or Downlink Control Information (DCI)) that schedules the PUSCH (DCI format 0_0 or 0_1) has the same HPN (HPN = i) as the HPN, or if the New Data Indication (NDI) is toggled, it may not be necessary to transmit the previous PUSCH repetition after the PDCCH. Further, since it takes processing time until the PDCCH is received and the PUSCH repetition is cancelled, the PUSCH repetition before a certain time after the last symbol of the PDCCH may not be cancelled, and only the subsequent PUSCH may be cancelled.

[0183] As a second termination condition, if another PUSCH is scheduled in the same symbol as the repeatedly transmitted PUSCH repetition, the terminal may not transmit the PUSCH repetition. More specifically, referring to FIG. 15(b), the transmission of the previous PUSCH repetition can be terminated by scheduling the PDCCH to overlap in the time domain with the previously scheduled PUSCH.

[0184] As a third termination condition, when the terminal receives an explicit Hybrid Automatic Repeat reQuest - Acknowledgement (HARQ - ACK) for the repeatedly transmitted PUSCH, it may not transmit any further PUSCH repetitions. The explicit HARQ - ACK is information by which the base station notifies the terminal of the success or failure of PUSCH transmission on another channel.

[0185] As a fourth termination condition, the terminal may not need to transmit PUSCH repetitions after a certain period of time. For example, if the requirement condition of the URLLC service that transmits PUSCH repetitions is to finish transmission within 1 ms, the terminal may not need to transmit PUSCH repetitions after 1 ms. Here, the certain period of time may be set as an absolute time such as 1 ms, or may be set based on slots such as 2 slots. The certain period of time may be a value set by the base station.

[0186] FIG. 16 is a diagram for explaining a method of counting the number of PUSCH repetitions. Still another embodiment of the present invention relates to a method for a terminal configured to transmit PUSCH K times repeatedly to count the number of PUSCH repetitions transmitted K times repeatedly. In the previous description, the terminal increased the number of PUSCH repetitions transmitted repeatedly only when actually transmitting PUSCH repetitions. However, as described above, a PUSCH delay that is too long may occur in order to transmit K times. To solve this problem, according to an embodiment of the present invention, the following counting rule is disclosed.

[0187] The first counting rule is as follows. If the terminal actually transmits PUSCH repetitions, it counts. Also, if it cannot be transmitted during Y symbols, it counts. When the count exceeds the number K of PUSCH repetitions, it does not transmit the PUSCH repetitions any further. Here, the Y symbol may be the number of symbols allocated to the PUSCH repetition. As yet another example, the Y symbol may be the number of symbols included in one slot. As yet another example, the Y symbol may be a value configured from the upper layer. FIG. 16(a) shows the number of PUSCH repetitions obtained by the first counting rule. Here, K = 4 is configured as the number of PUSCH repetitions for the terminal. And assume that Y = 5 is configured. The terminal did not transmit PUSCH repetitions at the last symbol of the first slot and the first 4 symbols of the second slot, but since it could not be transmitted during Y = 5 symbols, it must count. And it can transmit the last fourth PUSCH repetition at symbols 4, 5, 6, 7 of the second slot.

[0188] The second counting rule is as follows. If the terminal actually transmits PUSCH repetitions, it counts. Also, if it cannot transmit PUSCH repetitions even once in the Z slot, it counts. When the count exceeds the number K of PUSCH repetitions, it does not transmit the PUSCH repetitions any further. Here, the Z slot may preferably be one slot. As yet another example, the Z slot may be a value configured from the upper layer. FIG. 16(b) shows the number of PUSCH repetitions obtained by the second counting rule. Here, K = 4 is configured as the number of PUSCH repetitions for the terminal. And assume that Z = 1 is configured. The terminal did not transmit PUSCH repetitions in the second slot, but since it could not be transmitted during the Z = 1 slot, it counts. And it can transmit the last fourth PUSCH repetition at symbols 10, 11, 12, 13 of the third slot.

[0189] Referring to the 3GPP TS38.213 standard document, for the PUSCH through which the terminal transmits uplink data, it cannot cross the slot boundary. That is, the starting symbol and the last symbol of the scheduled PUSCH must always be located within the same slot (in the case of PUSCH repetition, the starting symbol and the last symbol may be located in different slots, but here we are dealing with general PUSCH transmission excluding the case of repeated transmission). More specifically, the base station notifies the terminal of the information regarding the symbols in which the PUSCH can be transmitted, using the SLIV (starting and length indication value). The SLIV can indicate the position of the starting symbol within the slot (expressed as S, which can have any one value from 0, 1, 2,..., 13) and the length (expressed as L, which can have any one value from 1, 2,..., 14). The characteristic of the SLIV value is that S + L = one of the values from 1, 2,..., 14. By using combinations where S + L > 14, the starting symbol and the last symbol can be located within the same slot. For example, if S = 5 and L = 10, it starts from the 6th symbol of the slot and has a length of 10 symbols, so 1 symbol becomes the first symbol of the next slot. Therefore, the starting symbol and the last symbol are located in different slots. Referring to 3GPP TS38.213, the SLIV can be obtained from the following Equation 1.

[0190] [Equation 1]

[0191] if (L - 1) ≤ 7 then

[0192] SLIV = 14·(L - 1) + S

[0193] else

[0194] SLIV = 14·(14 - L + 1) + (14 - 1 - S)

[0195] where 0 < L ≤ 14 - S, and

[0196] To provide URLLC services, the base station needs to allocate resources to the terminal so that PUSCH transmission starts as soon as possible. Also, a sufficient number of symbols must be used for sufficient reliability. However, as described above, since PUSCH cannot be scheduled across slot boundaries, if the number of symbols available for uplink transmission in the current slot is not sufficient, PUSCH repetition transmission must be scheduled in the next slot. This causes a delay until the next slot's transmission, which is not compatible with URLLC services. The method required to solve this is to use SLIV that can be scheduled across slot boundaries. Such a method is called a multi-segment transmission method. According to one aspect of the present invention, an SLIV design method that can be scheduled across slot boundaries is disclosed.

[0197] When the terminal receives scheduling information that crosses the slot boundary (i.e., S+L>14) in terms of the SLIV value, it cannot transmit PUSCH across the slot boundary. Therefore, based on the slot boundary, the terminal can transmit the first PUSCH repetition in the symbols corresponding to the forward slot and the second PUSCH repetition in the symbols corresponding to the backward slot. More specifically, the first PUSCH repetition with a length of L1 = 13 - S + 1 symbols may be transmitted from symbol S to symbol 13 (the last symbol) in the forward slot, and the second PUSCH repetition with a length of L2 may be transmitted from symbol 0 to symbol L2 - 1 in the backward slot. Here, L2 = L - L1. The first PUSCH repetition and the second PUSCH repetition may be the repeated transmission of the same TB (transport block). For reference, when these symbols are symbols in which uplink transmission is not possible, the terminal can transmit the first PUSCH repetition and the second PUSCH repetition using the remaining symbols excluding the said symbols. Here, the symbols in which uplink transmission is not possible may be, for example, DL symbols determined by semi-static DL / UL assignment, P flexible symbols immediately following the DL symbols determined by semi-static DL / UL assignment, symbols corresponding to the SS / PBCH block, and P flexible symbols immediately following the symbols corresponding to the SS / PBCH block. Here, for example, P may have a value of 1 or 2.

[0198] Figure 17 is a diagram for explaining PUSCH transmission across the slot boundary. Referring to Figure 17(a), when the start symbol S is symbol 6 and a PUSCH with a length of 14 is scheduled, a first PUSCH repetition with a length of 8 may be transmitted from symbol 6 to symbol 13 in the first slot, and a PUSCH repetition with a length of 6 may be transmitted from symbol 0 to symbol 5 in the second slot. Referring to Figure 17(b), when the first two symbols in the second slot are symbols in which uplink transmission is not possible, the terminal may not need to transmit PUSCH repetitions in these two symbols. Therefore, the second PUSCH repetition may be transmitted through four symbols starting from the third symbol in the second slot.

[0199] According to the previous method, if there are symbols that cannot be used for uplink transmission, the length of the PUSCH will decrease. To prevent this, when overlapping with symbols where uplink transmission is impossible, it is possible to shift and transmit to symbols where uplink transmission is possible after the symbols where the uplink transmission is impossible. For example, referring to FIG. 17(c), if the first two symbols of the second slot are symbols where uplink transmission is not possible, the terminal can transmit the second PUSCH repetition using six symbols where uplink transmission is possible after these two symbols. In this way, although the PUSCH repetition is postponed, the number of symbols assigned to the PUSCH repetition can be maintained, so that deterioration of the reception performance of the PUSCH can be prevented.

[0200] The SLIV design method according to one aspect of the present invention is as follows.

[0201] According to one embodiment of the present invention, the SLIV can be designed to satisfy the following conditions. The position S of the start symbol may have any one value of 0, 1,..., 13, and the length L of the entire PUSCH may have any one value of 1, 2,..., 14. Here, the value of S + L may have any value from 1 to 27 without any other constraints. The equation for obtaining the SLIV that satisfies this condition may be as follows.

[0202] - SLIV = S + 14*(L - 1) or

[0203] - SLIV = L - 1 + 14*S

[0204] If the formula SLIV = S + 14*(L - 1) is used to obtain SLIV, S can be obtained as the remainder when SLIV is divided by 14 (S = SLIV mod 14), and L can be obtained by adding 1 to the quotient obtained by dividing SLIV by 14 (L = floor(SLIV / 14)+1). Also, if the formula SLIV = L - 1 + 14*S is used to obtain SLIV, L can be obtained as the value obtained by adding 1 to the remainder when SLIV is divided by 14 (L = (SLIV mod 14)+1), and S can be obtained as the quotient obtained by dividing SLIV by 14. (S = floor(SLIV / 14)).

[0205] When determining SLIV in the above manner, the terminal can schedule across the boundary of one slot. However, when scheduling in the above manner, it cannot schedule up to the last symbol of the second slot (the slot in front of the slot boundary is called the first slot, and the slot behind is called the second slot). This is not efficient from the perspective of frequency utilization efficiency because only some symbols are used even though there are available symbols in the second slot. One embodiment of the present invention to solve this is as follows.

[0206] The position S of the start symbol may have any one value from 0, 1,..., 13, and the length L of all PUSCHs may have any one value from 1, 2,..., 28. Here, the value of S + L must be equal to or less than 28. For reference, here L can be up to 28, but since the PUSCH transmitted by the SLIV is divided at the slot boundary, the length of one PUSCH repetition is equal to or less than 14 symbols. The formula for obtaining SLIV that satisfies this condition is as follows.

[0207]

Equation

[0208] More generally, the position S of the start symbol may have any one value of 0, 1, ..., B, and the length L of all PUSCHs may have any one value of 1, 2, ..., A. Here, the value of S + L must be equal to or less than A. The formula for obtaining SLIV that satisfies this condition is as follows.

[0209] [Number]

[0210] For reference, if A = 14 and B = 13, it is the same as Equation 1. If A = 28 and B = 13, it is the same as the previous embodiment. Preferably, A may be determined as a multiple of the number of symbols included in one slot. For example, if the number of symbols included in one slot is 14, A may be determined as values such as 14, 28, 42, etc. Preferably, B may be determined as a value obtained by subtracting 1 from a multiple of the number of symbols included in one symbol. For example, if the number of symbols included in one slot is 14, B may be determined as values such as 13, 27, 41, etc.

[0211] According to still another embodiment of the present invention, among the SLIV values of the existing Equation 1, SLIV values whose length is an integer multiple and exceeds the slot boundary can be obtained. The position S of the start symbol may have any one value of 0, 1, ..., 13, and the length L of all PUSCHs may have any one value of 2, 4, 6, ..., 28. Here, the value of S + L must be equal to or less than 28. The formula for obtaining SLIV that satisfies this condition is as follows. Here, L can be obtained as 2*X, and X may have any one value of 1, 2, 3, ..., 14. This method can schedule across the slot boundary by doubling the length obtained in Equation 1. Generally, L can be obtained as A*X, and A may be determined as any one value of natural numbers of 2 or more.

[0212] [Number]

[0213] In addition to the analysis method of SLIV being similar to Equation 1, such a method represents SLIV with the same number of bits, so it is excellent from the perspective of overhead.

[0214] In still another embodiment of the present invention, according to Equation 1, the possible values that SLIV can have are a total of 14 * 15 / 2 = 105 values from 0, 1,..., 104. This may be represented by 7 bits. Since 7 bits can represent values from 0, 1,..., 127, a total of 23 values from 105, 106,..., 127 are no longer used. According to an embodiment of the present invention, the base station can schedule across slot boundaries using 23 values from SLIV = 105 to 127. More specifically, when it is any one value of SLIV = 105, 106,..., 127, the values of the position S and length L of the start symbol may be predefined. For example, if SLIV = 105, it may be defined as S = 7 and L = 14.

[0215] Combining the above-described mini-slot-level PUSCH repetition transmission and the multi-segment transmission method, a PUSCH repetition transmission method according to still another embodiment will be described.

[0216] FIG. 18 is a diagram for explaining a first PUSCH transmission method according to an aspect of the present invention. The first PUSCH transmission method is as follows. Referring to FIG. 18, the base station transmits to the terminal time domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repetition of the PUSCH, and transmits the number of repetitions K. The terminal determines the symbol in which the PUSCH repetition is transmitted based on the received information. Here, the next PUSCH repetition is transmitted continuously from the symbol immediately after the first PUSCH repetition. If a 1PUSCH repetition crosses a slot boundary, the PUSCH repetition may be divided based on the slot boundary. Also, when a 1PUSCH repetition overlaps with a DL symbol or an SS / PBCH block set in a semi-static UL / DL configuration, the terminal can transmit the PUSCH repetition in a symbol that does not overlap with the DL symbol. Further, the terminal can also exclude the flexible symbol immediately after the DL symbol set in the semi-static UL / DL configuration from the PUSCH repetition. Referring to FIG. 18, when 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 crosses the slot boundary, so the PUCHS repetition is divided based on the slot boundary. In such a method, when the PUSCH repetition is divided at the slot boundary, there may occur a disadvantage that the number of symbols of a 1PUSCH repetition is too small. According to an embodiment of the present invention for solving this problem, when the PUSCH repetition is configured with only 1 symbol, the terminal may not transmit the PUSCH repetition. This is because when the PUSCH repetition is configured with only 1 symbol, data other than DM-RS cannot be transmitted in the corresponding symbol. Consequently, when the number of symbols transmitted by the PUSCH repetition is less than or equal to the number of DM-RS symbols to be transmitted by the PUSCH repetition, the terminal may not transmit the PUSCH repetition.

[0217] FIG. 19 is a diagram for explaining a second PUSCH transmission method according to an aspect of the present invention. The second PUSCH transmission method is as follows. Referring to FIG. 19, the base station transmits to the terminal time domain resource allocation information (S: start symbol index, L: length) regarding the PUSCH. And the number of repetitions K is transmitted. The base station checks whether L*K symbols from the above start symbol cross the slot boundary. If not crossing the slot boundary, the first PUSCH repetition starts from the start symbol and is composed of L symbols, and thereafter K-1 PUSCH repetitions can start continuously from the symbol immediately after the first PUSCH repetition and occupy L symbols. If crossing the slot boundary, the terminal can divide the L*K symbols based on the slot boundary for PUSCH repetitions. Referring to FIG. 19, when the index of the start symbol of the PUSCH is 4, the length is 4, and the number of repetitions is 5, 20 symbols from the index 4 of the start symbol cross the slot boundary, so the terminal can divide the 20 symbols based on the slot boundary. Therefore, in FIG. 19, two PUSCH repetitions may be transmitted.

[0218] FIG. 20 is a diagram for explaining a third PUSCH transmission method according to an aspect of the present invention. The third PUSCH transmission method is as follows. Referring to FIG. 20, the base station transmits to the terminal time domain resource allocation information (S: start symbol index, L: length) regarding the first PUSCH repetition of the PUSCH. And the number of repetitions K is transmitted. The terminal determines the symbols for which the PUSCH repetition is to be transmitted based on the received information. Here, the next PUSCH repetition is transmitted continuously from the symbol immediately after the first PUSCH repetition. If one PUSCH repetition crosses the slot boundary, the terminal does not transmit the PUSCH repetition. Further, if one PUSCH repetition overlaps with a symbol set as DL in the semi-static UL-DL setting or an SS / PBCH block, the terminal does not transmit the PUSCH repetition. In FIG. 20, the third PUSCH repetition overlaps with the slot boundary and thus is not transmitted.

[0219] FIG. 21 is a diagram for explaining a fourth PUSCH transmission method according to an aspect of the present invention. The fourth PUSCH transmission method is as follows. Referring to FIG. 21, the base station transmits to the terminal time domain resource allocation information (S: start symbol index, L: length) regarding the first PUSCH repetition of the PUSCH. Then, the number of repetitions K is transmitted. The terminal determines the symbol in which the PUSCH repetition is transmitted based on the received information. Here, the next PUSCH repetition is transmitted continuously from the symbol immediately after the first PUSCH repetition. If the symbol allocated to 1 PUSCH repetition crosses the slot boundary, the terminal can divide the symbol allocated to the PUSCH repetition based on the slot boundary and include these divided symbols in adjacent PUSCH repetitions in the same slot. If there is no adjacent PUSCH repetition in the same slot, the terminal can transmit the PUSCH repetition with the said symbol. In FIG. 21, the symbol allocated to the third PUSCH repetition will cross the slot boundary. It can be divided into two symbols at the slot boundary. The previous two symbols may be included in the previous PUSCH repetition, and the subsequent two symbols may be included in the subsequent PUSCH repetition.

[0220] FIG. 22 is a diagram for explaining an example of transmitting information regarding a symbol in which PUSCH repetition transmission is impossible. Referring to FIG. 22, the base station can further transmit to the terminal information regarding a symbol in which PUSCH repetition transmission is impossible. The terminal transmits PUSCH repetition using the above-described first to fourth transmission methods. When a symbol in which PUSCH repetition transmission is impossible specified by the information transmitted from the base station overlaps with a symbol to which the PUSCH repetition is assigned, the terminal can exclude the symbol in which PUSCH repetition transmission is impossible from the PUSCH repetition. Or, when a symbol in which PUSCH repetition transmission is impossible overlaps with a symbol to which the PUSCH repetition is assigned, the terminal may not transmit the PUSCH repetition. Information regarding a symbol in which PUSCH repetition transmission is impossible may be set for the terminal through an RRC signal. Also, a symbol in which PUSCH repetition transmission is impossible is set for the terminal through an RRC signal, and among the set symbols in which PUSCH repetition transmission is impossible, it can be indicated by DCI which symbol is actually a symbol in which PUSCH repetition transmission is impossible. Further, when the base station sets a TDRA (time domain resource assignment) table for the terminal, a symbol in which PUSCH repetition transmission is impossible can be set to be different for each entry of each table. One entry of the set TDRA table is indicated to the terminal by DCI, and the terminal can transmit PUSCH repetition based on the symbol in which PUSCH repetition transmission is impossible set in the entry.

[0221] Yet 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 the TB may be proportional to the number of resource elements (REs) of the resources to which the PUSCH is allocated. That is, a PUSCH to which more REs are allocated may have a larger TB size. However, as described in the previous PUSCH repetition example, the number of REs that each PUSCH repetition can occupy may be different. For example, the first PUSCH repetition may occupy 2 symbols, and the second PUSCH repetition may occupy 10 symbols. In this case, it is necessary to determine which number of REs should be used as a reference for determining the TB size.

[0222] According to an embodiment of the present invention, the size of the TB can be determined based on the number of REs of the first PUSCH so that the first PUSCH is decodable. The reason for using PUSCH repetitions is to reduce the latency due to a high decoding success rate. Therefore, it is important that the first PUSCH is transmitted in a decodable manner. For such a purpose, the terminal can determine the size of the TB based on the number of REs of the first PUSCH. Generally, the terminal can determine the size of the TB based on the minimum value of the REs corresponding to the PUSCH repetition for which the redundancy version (RV) value is 0. However, if the size of the TB is always determined based on the number of REs of the first PUSCH, there is a problem that the optimal TB size cannot be determined because the number of REs occupied by other PUSCHs is not considered. For example, when the number of REs occupied by the first PUSCH is larger than the number of REs occupied by the second PUSCH, if the size of the TB is determined based on the number of REs occupied by the first PUSCH, the code rate will increase because the number of REs occupied by the second PUSCH is small, and performance degradation may occur.

[0223] According to an embodiment of the present invention to solve this problem, if the number of REs of the first PUSCH repetition is smaller than the average number of REs of all repetitions (i.e., the value obtained by dividing the number of REs of all PUSCH repetitions by the number of repetitions), the size of the TB is determined by the number of REs of the first PUSCH repetition; otherwise, the size of the TB can be determined by the average value of the number of REs of all repetitions. According to an embodiment of the present invention to solve this problem, if the size of the TB based on the number of REs of the first PUSCH repetition is smaller than the average of the sizes of the TBs based on the number of REs of all repetitions (i.e., the value obtained by dividing the sum of the sizes of the TBs based on the number of REs of each PUSCH repetition by the number of repetitions), the size of the TB is determined by the number of REs of the first PUSCH repetition; otherwise, the size of the TB is determined by the average of the sizes of the TBs based on the number of REs of all repetitions.

[0224] PUSCH Repetition Transmission and UCI Piggyback

[0225] Still another exemplary problem to be solved by the present invention is a problem related to PUSCH repetition transmission and UCI piggyback (or UCI multiplexing).

[0226] FIG. 23 is a diagram for explaining PUSCH repeated transmission for PUSCH coverage expansion and fast decoding. Referring to FIG. 23, when transmitting a PUSCH, a terminal can repeatedly transmit the PUSCH for PUSCH coverage expansion and fast decoding. More specifically, the terminal may be configured or instructed by the base station with the number of PUSCH repetitions for transmitting the PUSCH repetitively. When the terminal receives DCI that schedules the transmission of the PUSCH, the DCI can indicate the time-frequency region occupied by the first PUSCH repetition of the PUSCH to be repeatedly transmitted. The terminal can transmit PUSCH repetitions according to the number of repetitions after the first PUSCH repetition indicated by the DCI. Referring to FIG. 23(a), the terminal is configured and instructed to transmit the PUSCH twice repetitively, and the terminal can transmit the first PUSCH repetition (PUSCH rep#0) according to the allocation information of the time-frequency resource indicated by the DCI. Then, the second PUSCH repetition (PUSCH rep#1) can be transmitted after the first PUSCH repetition (PUSCH rep#0). In each PUSCH repetition, a DM-RS (demodulation reference signal) for channel estimation may be included and transmitted. FIG. 23(a) shows an example in which the DM-RS is transmitted in the first symbol for each PUSCH repetition. The position of the symbol where the DM-RS can be transmitted may be configured by the base station. In the present invention, for convenience, it is described as being configured such that the DM-RS is located at the first symbol of the PUSCH repetition, but the idea of the present invention is equally applicable when the DM-RS is configured to be located at other positions.

[0227] Referring to FIG. 23(b), when the terminal repeatedly transmits PUSCH, it may omit the transmission of DM-RS in the PUSCH repetition. Data to be transmitted on the uplink (i.e., UL-SCH) may be rate-matched and transmitted to the resource where DM-RS is omitted. When omitting DM-RS in this way, the base station can estimate the channel using the DM-RS of other PUSCH repetitions and can receive the data transmitted on the uplink using this value. By not transmitting DM-RS, more resources can be used for the data (UL-SCH) transmitted on the uplink, thus increasing the transmission success probability of PUSCH.

[0228] As an embodiment of the present invention, when the terminal repeatedly transmits PUSCH, whether to include DM-RS in the PUSCH repetition may be determined as follows.

[0229] As a first method, the base station may configure the terminal with the period (number) of PUSCH repetitions including DM-RS. More specifically, the base station may configure the terminal to include DM-RS for every X PUSCH repetitions. At this time, the first PUSCH repetition in each slot can always include DM-RS, and DM-RS can be included every X PUSCH repetitions starting from the first PUSCH repetition in the slot. If X = 2, the terminal may include DM-RS in the first PUSCH repetition in the slot and omit DM-RS in the second PUSCH repetition. Subsequently, DM-RS can be included in the third PUSCH repetition and omitted in the fourth PUSCH repetition. If X = 3, the terminal may include DM-RS in the first PUSCH repetition and omit DM-RS in the second and third PUSCH repetitions. Subsequently, DM-RS can be included in the fourth PUSCH repetition and omitted in the fifth and sixth PUSCH repetitions. FIG. 31 shows a case where PUSCH repetitions are repeatedly transmitted across slot boundaries. Since the first PUSCH repetition in each slot must always include DM-RS, DM-RS is included in the first PUSCH repetition (PUSCH rep#0) and the second PUSCH repetition (PUSCH rep#1). Then, if X = 2 is applied starting from the second PUSCH repetition, DM-RS can be omitted in the third PUSCH repetition and included in the fourth PUSCH repetition.

[0230] The disadvantage of the first method is that it does not consider the length of the PUSCH. According to the first method, when the length of the PUSCH changes, the interval between DM-RS symbols changes. In fact, since the interval of the DM-RS required for channel estimation is determined according to the channel environment, this is not preferable. A second method to solve this is that the base station configures the number of symbols Y for the terminal as the interval between DM-RS symbols. The terminal can arrange the DM-RS at approximately the Y-symbol interval. More specifically, when Y is configured, whether a PUSCH repetition includes the DM-RS can be determined as follows. First, the first PUSCH repetition in a slot always includes the DM-RS. If the interval between the DM-RS symbol of the second PUSCH repetition and the DM-RS of the first PUSCH repetition is smaller than Y symbols, the terminal can omit the DM-RS of the second PUSCH repetition. Conversely, if the interval between the DM-RS symbol of the second PUSCH repetition and the DM-RS of the first PUSCH repetition is greater than or equal to Y symbols, the terminal can include the DM-RS of the second PUSCH repetition. To determine whether to include the DM-RS of the nth PUSCH repetition, if the interval between the last previous DM-RS symbol and the DM-RS symbol of the nth PUSCH repetition is smaller than Y symbols, the terminal can omit the DM-RS of the nth PUSCH repetition. Conversely, if the interval between the last previous DM-RS symbol and the DM-RS symbol of the nth PUSCH repetition is greater than or equal to Y symbols, the terminal can include the DM-RS of the nth PUSCH repetition. As yet another method, a PUSCH repetition that is completely included within Y symbols from the DM-RS rather than partially included may omit the DM-RS symbol. Conversely, if a PUSCH repetition is partially included within Y symbols from the DM-RS or not included at all, the DM-RS can always be included in the PUSCH repetition.

[0231] FIG. 24 is a diagram for explaining the multiplexing or piggybacking of a PUSCH repetition with DM-RS omitted and another PUCCH transmitted in the same symbol. Referring to FIG. 24, the problem to be solved by the present invention is related to a method of multiplexing (or piggybacking) UCI (Uplink control information) included in the PUCCH and transmitting it on the PUSCH when the terminal is configured and instructed such that a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. Referring to the 3GPP TS38.213 standard document, when the terminal is configured and instructed such that the PUSCH and the PUCCH are transmitted in the same symbol, the UCI included in the PUCCH may be multiplexed (or piggybacked) on the PUSCH. At this time, the time-frequency resource to which the UCI is mapped may be located in the symbol immediately following the DMRS of the PUSCH. By arranging the UCI in the symbol immediately following the DM-RS, the reliability of the UCI (i.e., the probability of successfully transmitting the UCI) can be increased. And when there are two or more PUSCHs overlapping with one PUCCH, the terminal may multiplex (or piggyback) the UCI included in the PUCCH on each of the overlapping PUSCH repetitions. However, when the PUSCH repetition transmitted by the terminal does not include a DM-RS symbol, it is not determined at which time-frequency resource the terminal must transmit the UCI included in the PUCCH. The present invention presents a method for determining the symbol in which the multiplexed (or piggybacked) UCI is transmitted.

[0232] FIG. 25 is a diagram for explaining UCI transmission in a configuration where PUSCH repetitions with DM-RS omitted and other PUCCHs are transmitted in the same symbol. As an example of the present invention, with reference to FIG. 25, when a terminal is configured and instructed such that PUSCH repetitions with DM-RS omitted and other PUCCHs are transmitted in the same symbol, the UCI included in the PUCCH can be transmitted from a defined symbol of the PUSCH repetition with DM-RS omitted. Here, preferably, the position of the defined symbol may be the first symbol of the PUSCH repetition. Here, preferably, the position of the defined symbol may also be the last symbol of the PUSCH repetition. In FIG. 25, it is assumed that the symbol to which the UCI is mapped is the first symbol of the second PUSCH repetition (PUSCH rep#1).

[0233] FIG. 26 is a diagram for explaining UCI transmission assuming DM-RS omitted in a configuration where PUSCH repetitions with DM-RS omitted and other PUCCHs are transmitted in the same symbol. As yet another example of the present invention, with reference to FIG. 26, when a terminal is configured and instructed such that PUSCH repetitions with DM-RS omitted and other PUCCHs are transmitted in the same symbol, the terminal can map and transmit the UCI at the symbol immediately after the DM-RS assuming that the DM-RS is omitted but exists in the PUSCH repetition. This has the advantage that the UCI mapping can be maintained the same between PUSCH repetitions with DM-RS present and PUSCH repetitions with DM-RS absent. FIG. 26 shows that the UCI may be transmitted at the symbol immediately after the symbol occupied by the DM-RS if the DM-RS is transmitted in the second PUSCH repetition (PUSCH rep#1).

[0234] FIG. 27 is a diagram for explaining UCI multiplexing for adjacent DM-RS transmission PUSCH repetitions in a configuration where a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. As yet another embodiment of the present invention, referring to FIG. 27, when a terminal is configured and instructed such that a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol, the terminal can multiplex (or piggyback) and transmit UCI in a PUSCH repetition that transmits DM-RS among adjacent PUSCH repetitions. Here, the PUSCH repetition that transmits the DM-RS may be a PUSCH repetition that does not overlap with the same symbol as the PUCCH. UCI can be mapped and transmitted to a symbol immediately following the DM-RS symbol of the PUSCH repetition that transmits the DM-RS. As an embodiment of the present invention, among adjacent PUSCH repetitions, the PUSCH repetition that transmits DM-RS may be determined to be any one of the following. As a first method, it is a PUSCH repetition including the nearest DM-RS among PUSCH repetitions before the PUSCH repetition with the overlapping DM-RS omitted. As a second method, it is a PUSCH repetition including the nearest DM-RS among PUSCH repetitions after the PUSCH repetition with the overlapping DM-RS omitted. As a third method, it is a PUSCH repetition including the nearest DM-RS to the overlapping PUCCH. FIG. 27 shows transmitting UCI in the first PUSCH repetition (PUSCH rep#0) by the first method. FIG. 28 shows transmitting UCI in the third PUSCH repetition (PUSCH rep#2) by the third method.

[0235] As yet another embodiment of the present invention, referring to FIG. 27, when a terminal is configured and instructed such that a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol, the terminal can drop the PUSCH repetition and transmit the PUCCH. However, when the terminal is configured and instructed such that a PUSCH repetition including DM-RS and another PUCCH are transmitted in the same symbol, the UCI of the PUCCH can be multiplexed (or piggybacked) and transmitted in the PUSCH repetition.

[0236] FIG. 29 is a diagram for explaining the omission of UCI information multiplexing in a configuration where a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. As yet another embodiment of the present invention, referring to FIG. 29, when the terminal is configured and instructed such that a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol, if UCI included in the PUCCH is transmitted in at least one PUSCH repetition, it is not necessary to multiplex or piggyback UCI information in the PUSCH repetition with DM-RS omitted. In FIG. 29, a case is shown where the second PUSCH repetition (PUSCH rep#1), the third PUSCH repetition (PUSCH rep#2), the fourth PUSCH repetition (PUSCH rep#3) and the PUCCH are configured and instructed to be transmitted in the same symbol. Here, the DM-RS is omitted in the second and fourth PUSCH repetitions, and the DM-RS is included in the first and third PUSCH repetitions. Since the DM-RS exists in the third PUSCH repetition, UCI information is multiplexed (or piggybacked) and transmitted in this PUSCH repetition. Therefore, it is not necessary to multiplex (or piggyback) the UCI information in the second and fourth PUSCH repetitions with DM-RS omitted.

[0237] Yet another exemplary problem to be solved by the present invention relates to a method of UCI multiplexing (or piggybacking) in a situation where multiple PUSCH repetitions overlap with one PUCCH symbol. For example, when four 2-symbol PUSCH repetitions (the first PUSCH repetition, the second PUSCH repetition, the third PUSCH repetition, the fourth PUSCH repetition) overlap with one PUCCH symbol, the terminal has to piggyback UCI on the four PUSCH repetitions. In this case, since the same UCI information is repeatedly transmitted in the four PUSCH repetitions, not only does the problem of increased resources used for UCI transmission occur, but also the resources to be used for uplink data (i.e., UL-SCH) for UCI transmission become insufficient, which may lead to uplink data transmission failure. The present invention presents a method for solving this problem.

[0238] According to an embodiment of the present invention, when a plurality of PUSCH repetitions overlap with one PUCCH in a symbol, UCI information may be multiplexed (or piggybacked) and transmitted only in one PUSCH repetition, and UCI information may not be transmitted in the remaining PUSCH repetitions. Preferably, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions. As another method, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions that overlap with the PUCCH. As another method, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions. As another method, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions that overlap with the PUCCH. As another method, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions that satisfy the PUCCH processing time. As another method, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions within the slot in which the PUCCH is transmitted. As another method, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions within the slot in which the PUCCH is transmitted. As another method, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions that overlap with the PUCCH. As another method, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions that satisfy the PUCCH processing time within the slot in which the PUCCH is transmitted. In the selection process, PUSCH repetitions without DM-RS may be excluded.

[0239] According to an embodiment of the present invention, when multiplexing (or piggybacking) UCI information with a plurality of PUSCH repetitions for transmission, instead of transmitting all UCI information in each PUSCH repetition, the terminal may separately transmit the UCI information in respective PUSCH repetitions. For example, when the UCI information is given as N bits and the UCI information is multiplexed (or piggybacked) and transmitted with 2 PUSCH repetitions, the terminal can transmit half of the N-bit UCI information (N / 2 bits, or ceil(N / 2) bits, or floor(N / 2) bits) in one PUSCH repetition and transmit the remaining half (N / 2 bits, or floor(N / 2) bits, or ceil(N / 2) bits) in the remaining one PUSCH repetition. Generally, when multiplexing (or piggybacking) and transmitting UCI information with K PUSCH repetitions, ceil(N / K) bits can be transmitted in K1 = mod(N,K) PUSCH repetitions, or floor(N / K) bits can be transmitted in K2 = K - K1 PUSCH repetitions. Here, different types of UCI information in the above process may be separately divided. That is, HARQ-ACK information, CSI part 1, and CSI part 2 may be respectively divided and mapped to PUSCH repetitions for transmission.

[0240] Yet another exemplary problem to be solved by the present invention relates to a method of transmitting UCI included in PUCCH when symbols of PUCCH overlap with those of a PUSCH configured with intra-slot hopping during transmission. Referring to the 3GPP TS38.213 standard document, UCI can be multiplexed (or piggybacked) separately to two hops (the first hop and the second hop) of a PUSCH configured with intra-slot hopping for transmission. FIG. 30 is a diagram for explaining UCI transmission when a PUSCH configured with intra-slot hopping overlaps with at least one symbol. For example, referring to FIG. 30, when PUCCH overlaps with PUSCH with at least one symbol, UCI can be transmitted to two hops. By transmitting UCI to two hops in this way, UCI can also obtain a frequency diversity gain, so the reception success probability can increase. However, referring to FIG. 30, compared with transmitting only PUCCH alone, since UCI is transmitted to two hops, reception of all UCI is possible only after receiving the UCI transmitted in the second hop. Therefore, a delay may occur in receiving UCI. The present invention presents a method for solving this problem.

[0241] As an embodiment of the present invention, a terminal can multiplex (or piggyback) UCI information only in the hop of PUSCH that overlaps with PUCCH. That is, referring to FIG. 30, if PUCCH overlaps in the first hop but does not overlap in the second hop, all UCI information is multiplexed (or piggybacked) and transmitted in the first hop. As yet another embodiment, a terminal can multiplex (or piggyback) UCI information in the hop of PUSCH that overlaps with PUCCH and the previous hop. That is, if PUCCH overlaps in the first hop but does not overlap in the second hop, all UCI information is multiplexed (or piggybacked) and transmitted in the first hop, and if PUCCH does not overlap in the first hop but overlaps in the second hop, UCI information can be multiplexed (or piggybacked) separately in the first hop and the second hop for transmission.

[0242] The method and system of the present invention have been described in connection with specific embodiments, but some or all of their components or operations can be implemented using a computer system having a general-purpose hardware architecture.

[0243] The foregoing description of the present invention is for illustrative purposes, and those of ordinary skill in the art to which the present invention pertains will understand that it can be easily transformed into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented distributively, and similarly, components described as being distributed may also be implemented in a combined form.

[0244] The scope of the present invention is represented by the claims described below rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Description of Reference Numerals

[0245] 100 Terminal 110 Processor 120 Communication Module 121 Cellular Communication Interface Card 122 Cellular Communication Interface Card 123 Unlicensed Band Communication Interface Card 130 Memory 140 User Interface 150 Display Unit 200 Base Station 210 Processor 220 Communication Module 221 Cellular Communication Interface Card 222 Cellular Communication Interface Card 223 Unlicensed Band Communication Interface Card 230 Memory

Claims

1. In a wireless communication system, a method for a terminal to transmit a physical uplink shared channel (PUSCH) to a base station, comprising: receiving, from the base station, a radio resource control (RRC) signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols; receiving a physical downlink control channel (PDCCH) that schedules a PUSCH transmission including at least one PUSCH repetition; determining whether at least one of the number of symbols required to transmit the PUSCH repetition is a symbol in which transmission of the PUSCH repetition is impossible; and transmitting the PUSCH repetition to the base station based on a determination as to whether transmission of the PUSCH repetition is impossible, wherein when transmission of the PUSCH repetition is impossible, the method includes a case where at least one of the symbols is a symbol designated as a semi-static downlink symbol according to the configuration information.

2. The step of transmitting the PUSCH repetition includes: transmitting the PUSCH repetition excluding at least one symbol in which transmission of the PUSCH repetition is impossible from among the number of symbols required to transmit the PUSCH repetition, according to Claim 1.

3. The method according to Claim 1, further including a case where when transmission of the PUSCH repetition is impossible, at least one of the symbols is located before a slot boundary and at least one is located after the slot boundary.

4. The step of transmitting the PUSCH repetition includes transmitting the PUSCH repetition at the earliest symbol in which transmission of the PUSCH repetition is possible, according to Claim 1.

5. When transmission of the PUSCH repetition is impossible, the method according to Claim 1 further includes a case where at least one of the symbols is a flexible symbol equal to or less than a critical number following a semi-static downlink symbol.

6. When transmission of the PUSCH repetition is impossible, The method according to claim 1, further comprising the case where at least one of the symbols is included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

7. When transmission of the PUSCH repetition is not possible, The method according to claim 1, further comprising the case where at least one of the symbols is a flexible symbol equal to or less than a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

8. Further comprising the step of receiving, from the base station, information regarding at least one symbol for which transmission of the PUSCH repetition is not possible, by means of an RRC signal, The method according to claim 1, further comprising the case where, when transmission of the PUSCH repetition is not possible, transmission of the PUSCH repetition is indicated as not possible by information regarding the at least one symbol from the PDCCH.

9. The step of transmitting the PUSCH repetition is The method according to claim 1, wherein the step is interrupted in response to a PUSCH having the same hybrid automatic repeat request (HARQ) process number (HPN) as the PUSCH including the PUSCH repetition being scheduled.

10. The PDCCH indicates any one value from 0 to 13 as the position (S) of the start symbol of transmission of the PUSCH, and indicates any one value from 1 to 14 as the length (L) of the PUSCH for transmission, and the sum of S and L has any one value from 1 to 27. The method according to claim 1.

11. A terminal that transmits a physical uplink shared channel (PUSCH) to a base station in a wireless communication system, A communication module configured to receive a radio resource control (RRC) signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols from the base station, receive a physical downlink control channel (PDCCH) from the base station that schedules a PUSCH transmission including at least one PUSCH repetition, or transmit PUSCH repetitions to the base station; A memory configured to store control programs and data used in the terminal; and A processor configured to determine whether at least one of the number of symbols required for the transmission of the PUSCH repetition is impossible to transmit the PUSCH repetition, and control the transmission of the PUSCH repetition based on the determination of whether it is impossible to transmit the PUSCH repetition, A terminal, including the case where when it is impossible to transmit the PUSCH repetition, at least one of the symbols is designated as a semi-static downlink symbol according to the configuration information.

12. The processor is The terminal according to claim 11, wherein the transmission of the PUSCH repetition is controlled to transmit the PUSCH repetition except for at least one symbol that is impossible to transmit the PUSCH repetition among the number of symbols required for transmitting the PUSCH repetition.

13. The terminal according to claim 11, further including the case where when it is impossible to transmit the PUSCH repetition, at least one of the symbols is located before the slot boundary and at least one is located after the slot boundary.

14. The processor is The terminal according to claim 11, wherein the transmission of the PUSCH repetition is controlled to transmit the PUSCH repetition at the earliest symbol at which the PUSCH repetition can be transmitted.

15. The terminal according to claim 11, further including the case where when it is impossible to transmit the PUSCH repetition, at least one of the symbols is a flexible symbol equal to or less than a critical number following a semi-static downlink symbol.

16. The terminal according to claim 11, further including a case where, when transmission of the PUSCH repetition is impossible, at least one of the symbols is included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

17. The terminal according to claim 11, further including a case where, when transmission of the PUSCH repetition is impossible, at least one of the symbols is a flexible symbol equal to or less than a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

18. The communication module is further configured to receive, from the base station, information regarding at least one symbol for which transmission of the PUSCH repetition is impossible, by means of an RRC signal. The terminal according to claim 11, further including a case where, when transmission of the PUSCH repetition is impossible, transmission of the PUSCH repetition is indicated to be impossible by information regarding the at least one symbol from the PDCCH.

19. The processor controls transmission of the PUSCH repetition so as to interrupt transmission of the PUSCH repetition in response to scheduling of a PUSCH having the same hybrid automatic repeat request (HARQ) process number (HPN) as the PUSCH including the PUSCH repetition, the terminal according to claim 11.

20. The terminal according to claim 11, wherein the PDCCH indicates any one value from 0 to 13 as a position (S) of a start symbol of transmission of the PUSCH, indicates any one value from 1 to 14 as a length (L) of the PUSCH for transmission, and the sum of S and L has any one value from 1 to 27.

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