Transmission method of uplink shared channel in a wireless communication system and apparatus 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, and more particularly to a method and apparatus for transmitting an uplink shared channel in a wireless communication system. [Background technology]

[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. In order to achieve high data transfer rates, the 5G communication system includes a system operated using a millimeter wave (mmWave) band above 6 GHz, and also includes a communication system operated using a frequency band below 6 GHz in terms of ensuring coverage, and as a result, the implementation form in the base station and the terminal is under consideration.

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

[0004] To mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, beamforming, massive array multiple input / output (massive MIMO), full dimension multiple input / output (FD-MIMO), array antenna, analog beam-forming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies are being discussed for 5G communication systems. In addition, to improve the system network, technological developments are being conducted for the 5G communication system regarding advanced small cells, improved small cells, cloud radio access network (cloud RAN), 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.In addition, advanced coding modulation (ACM) methods such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are being developed for 5G systems.

[0005] Meanwhile, in a human-centered connected network where humans generate and consume information, the Internet is evolving into an Internet of Things (IoT) network that exchanges information between distributed components such as objects. Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connection to cloud servers. To implement IoT, technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and as a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) have been considered for connection 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 fusion and mixing of existing information technology (IT) with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, health management, smart home appliances, and advanced medical services.

[0006] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas. The application of Cloud RAN as a big data processing technology described above is an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems are developed to provide voice services while ensuring user activity.

[0007] However, mobile communication systems are gradually expanding beyond voice services to data services, and have now been developed to the extent that they provide high-speed data services. However, due to the phenomenon of resource shortage in currently available mobile communication systems and users' demand for high-speed services, more advanced mobile communication systems are required. Summary of the Invention [Problem to be solved by the invention]

[0008] An objective of one embodiment of the present invention is to provide a method for a terminal in a wireless communication system to repeatedly transmit a physical uplink shared channel (PUSCH) to a base station, and a terminal therefor. [Means for solving the problem]

[0009] According to one embodiment of the present invention, a method for a terminal transmitting a physical uplink shared channel (PUSCH) to a base station in a wireless communication system includes: receiving a radio resource control (RRC) signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols from the base station; receiving a physical downlink control channel (PDCCH) scheduling a PUSCH transmission including at least one PUSCH repetition; determining whether at least one of a number of symbols required for transmitting a PUSCH repetition is a case in which the PUSCH repetition cannot be transmitted; and transmitting the PUSCH repetition to the base station based on the determination of whether the PUSCH repetition is a case in which the PUSCH repetition cannot be transmitted.

[0010] According to one aspect, the case where the PUSCH repetition cannot be transmitted may include a case where at least one of the symbols is designated as a semi-static downlink symbol by 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 on which the PUSCH repetition cannot be transmitted among a number of symbols required for transmitting the PUSCH repetition.

[0012] According to an aspect, the case where the transmission of the PUSCH repetition is not possible may further include a case where at least one of the symbols is located before a slot boundary and at least one of the symbols is located after a slot boundary.

[0013] According to one aspect, the step of transmitting the PUSCH repetition may include transmitting the PUSCH repetition in an earliest symbol in which the PUSCH repetition can be transmitted.

[0014] According to an aspect, the case where the PUSCH repetition cannot be transmitted may further include a case where at least one of the symbols is a semi-static downlink symbol followed by a threshold number or less of flexible symbols.

[0015] According to one aspect, when the transmission of the PUSCH repetition is not possible, the case 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 PUSCH repetition cannot be transmitted, the case may further include a case where at least one of the symbols is a flexible symbol less than or equal to a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0017] According to one aspect, the method may further include a step of receiving information regarding at least one symbol on which the PUSCH repetition cannot be transmitted from the base station via an RRC signal, and if the PUSCH repetition cannot be transmitted, the method may further include a step of indicating that the PUSCH repetition cannot be transmitted based on 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 HARQ process number (HPN) as the PUSCH that includes the PUSCH repetition transmission being scheduled.

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

[0020] In another embodiment of the present invention, a terminal transmitting a physical uplink shared channel (PUSCH) to a base station in a wireless communication system includes 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 a PUSCH repetition 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 a number of symbols required for transmission of the PUSCH repetition is a case in which a PUSCH repetition cannot be transmitted, and to control transmission of the PUSCH repetition based on a determination of whether the PUSCH repetition is a case in which a PUSCH repetition cannot be transmitted.

[0021] According to one aspect, the case where the PUSCH repetition cannot be transmitted may include a case where at least one of the symbols is designated as a semi-static downlink symbol by the configuration information.

[0022] According to one aspect, the processor can control transmission of the PUSCH repetition to transmit the PUSCH repetition excluding at least one symbol on which the PUSCH repetition cannot be transmitted among the number of symbols required to transmit the PUSCH repetition.

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

[0024] According to one aspect, the processor may control transmission of the PUSCH repetition to transmit the PUSCH repetition in an earliest symbol in which the PUSCH repetition can be transmitted.

[0025] According to an aspect, the case where the PUSCH repetition cannot be transmitted may further include a case where at least one of the symbols is a semi-static downlink symbol followed by a threshold number or less of flexible symbols.

[0026] According to one aspect, when the transmission of the PUSCH repetition is not possible, the case 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 PUSCH repetition cannot be transmitted, the case may further include at least one of the cases where at least one of the symbols is a flexible symbol less than or equal to a critical number following a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

[0028] According to one aspect, the communication module may be further configured to receive information regarding at least one symbol on which the PUSCH repetition cannot be transmitted from the base station via an RRC signal, and when the PUSCH repetition cannot be transmitted, the communication module may further include a case where the PDCCH indicates that the PUSCH repetition cannot be transmitted based on the information regarding the at least one symbol.

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

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

[0031] According to the method in which a terminal repeatedly transmits a PUSCH to a base station in the wireless communication system according to one embodiment of the present invention, the terminal repeats the PUSCH as quickly as possible and transmits it repeatedly to the base station, thereby achieving the target performance of a 5G wireless communication system that aims to provide a service with low latency and high reliability.

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

[0033] [Figure 1]FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system. [Diagram 2] FIG. 1 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Diagram 3] 1 is a diagram illustrating physical channels used in a 3GPP system and a typical signal transmission method using the physical channels. [Figure 4a] A diagram showing SS / PBCH blocks for initial cell access in a 3GPP NR system. [Figure 4b] A diagram showing SS / PBCH blocks for initial cell access in a 3GPP NR system. [Figure 5a] FIG. 1 illustrates a procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 5b] FIG. 1 illustrates a procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 6] FIG. 1 illustrates a control resource set (CORESET) in which a physical downlink control channel (PDCCH) may be transmitted in a 3GPP NR system. [Figure 7] A diagram showing a method for configuring a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 1 is a conceptual diagram showing carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining single carrier communication and multi-carrier communication. [Figure 10] A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 11] 2 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention. [Figure 12]10 is a flowchart illustrating a method for a terminal to transmit PUSCH repetitions to a base station in a wireless communication system according to an embodiment. [Figure 13] FIG. 1 is a diagram illustrating the relationship between downlink symbols, slot boundaries, and PUSCH repetitions. [Figure 14] 1 is a diagram illustrating the relationship between a semi-static DL symbol followed by a threshold number of flexible symbols and PUSCH repetitions. [Figure 15] FIG. 13 is a diagram illustrating a condition for ending transmission of PUSCH repetitions. [Figure 16] FIG. 13 is a diagram for explaining a method of counting the number of PUSCH repetitions. [Figure 17] FIG. 1 is a diagram illustrating PUSCH transmission across slot boundaries. [Figure 18] 1 is a diagram illustrating a first PUSCH transmission method according to one aspect of the present invention. [Figure 19] 1 is a diagram illustrating a second PUSCH transmission method according to one aspect of the present invention. [Figure 20] 1 is a diagram illustrating a third PUSCH transmission method according to one aspect of the present invention. [Figure 21] 1 is a diagram illustrating a fourth PUSCH transmission method according to one aspect of the present invention. [Figure 22] 11A and 11B are diagrams illustrating an example of transmitting information regarding symbols for which PUSCH repetition cannot be transmitted. [Figure 23] 1 is a diagram illustrating PUSCH repetitive transmission for PUSCH coverage expansion and fast decoding. [Figure 24] A diagram illustrating multiplexing or piggybacking of a configuration in which a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. [Diagram 25] 11 is a diagram illustrating UCI transmission in a configuration in which a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. FIG. [Figure 26]FIG. 13 is a diagram illustrating UCI transmission assuming an omitted DM-RS in a configuration in which a PUSCH repetition with the DM-RS omitted and another PUCCH are transmitted in the same symbol. [Figure 27] 13 is a diagram illustrating a first method of UCI multiplexing for adjacent DM-RS transmission and PUSCH repetition transmission in a configuration in which a PUSCH repetition without DM-RS and another PUCCH are transmitted in the same symbol. [Figure 28] FIG. 13 is a diagram illustrating a third method of UCI multiplexing for adjacent DM-RS transmission and PUSCH repetition transmission in a configuration in which a PUSCH repetition without DM-RS and another PUCCH are transmitted in the same symbol. [Figure 29] 13 is a diagram illustrating the omission of UCI information multiplexing in a configuration in which a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. FIG. [Diagram 30] FIG. 13 is a diagram illustrating UCI transmission when PUSCHs configured with intra-slot hopping overlap in at least one symbol. [Diagram 31] FIG. 13 is a diagram illustrating a case where PUSCH repetition is repeatedly transmitted across slot boundaries. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The terms used in this specification adopt the currently widely used general terms as possible by considering the functions in the present invention, but the terms may be changed according to the intentions, practices, and emergence of new technologies of those skilled in the art. Furthermore, in certain cases, there are terms that are arbitrarily selected by the applicant, and in this case, their meanings are explained in the corresponding description of the present specification. Therefore, it is intended to be clear 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 contents throughout this specification.

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

[0036] The following technologies may 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). CDMA may be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented by wireless technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (EUMTS) using Evolved UMTS Terrestrial Radio Access (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 enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) services, which are requirements of IMT-2020. For the sake of clarity, 3GPP NR is mainly described, but the technical idea of ​​the present invention is not limited thereto.

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

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

[0039] Referring to FIG. 1, a wireless frame (or radio frame) used in a 3GPP NR system has a length of 10 ms (Δf max N f / 100)*T c ) In addition, the wireless frame includes 10 subframes (SF) of equal size. 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. The 10 subframes in one wireless frame may be assigned numbers from 0 to 9. Each subframe may be 1 ms long and may contain one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that may be used is 15*2 μkHz, and μ can have values ​​of μ=0, 1, 2, 3, 4 for 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 is 2 μ slots, each of which may have a length of 2 -μ ms. 2 in one subframe μ slots, 0 to 2 each μ In addition, the slots in one wireless frame may be assigned numbers from 0 to 10*2. μ The time resources may be allocated numbers up to -1. The time resources may be distinguished by at least one of a wireless frame number (also referred to as a wireless frame index), a subframe number (also referred to as a subframe index), and a slot number (or slot index).

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

[0041] Specifically, FIG. 2 shows the structure of a resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to FIG. 2, a slot includes multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol section. Unless otherwise specified, an OFDM symbol may simply be referred to as a symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Referring to FIG. 2, the signal transmitted from each slot is divided into N size,μ grid,x *N RB sc Book subcarrier and N slot symbmay be represented by a resource grid containing N OFDM symbols, where x=DL if the signal is a DL signal and x=UL if the signal is a UL signal. 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), and N slot symb N represents the number of OFDM symbols in a slot. RB sc is the number of subcarriers that make up one RB, and N RB sc = 12. Depending on the multiple access scheme, OFDM symbols may be called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols.

[0042] The number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 14 OFDM symbols, while in the case of an extended CP, one slot may include 12 OFDM symbols. In a particular embodiment, the extended CP may be used only in a 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured with 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 is N size,μ grid,x *N RB sc The subcarrier type may be divided into data subcarriers for data transmission, reference signal subcarriers for the transmission of reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0043] One RB is N RB sc A RB may be defined by N (e.g., 12) consecutive subcarriers. For reference, a resource consisting of one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or tone. Thus, one RB may be defined by N slot symb *N RB sc Each resource element in the resource grid may be uniquely defined in one slot by a pair of indices (k, l), where k ranges from 0 to N in the frequency domain. size,μ grid,x *N RB sc -1, and l is an index ranging from 0 to N in the time domain. slot symb It may be an index that scales down to -1.

[0044] In order for a UE to receive signals from or transmit signals to a base station, the time / frequency of the UE may be synchronized to the time / frequency of the base station, since when the base station and the UE are synchronized, the UE can determine the necessary time and frequency parameters to demodulate DL signals and transmit UL signals at the appropriate time.

[0045] Each symbol of a radio frame used in time division duplex (TDD), i.e., unpaired spectrum, may be configured with at least one of DL symbols, UL symbols, and flexible symbols. A radio frame used as a DL carrier in frequency division duplex (FDD), i.e., paired spectrum, may be configured with DL symbols or flexible symbols, and a radio frame used as a UL carrier may be configured with UL symbols or flexible symbols. A DL symbol allows DL transmission but not UL transmission. A UL symbol allows UL transmission but not DL transmission. A flexible symbol may 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 DL symbol, UL symbol, and flexible symbol, can be configured by using cell-specific or common radio resource control (RRC) signals. In addition, information about the type of each symbol can be additionally configured by using UE-specific or dedicated RRC signals. The base station informs i) the duration of the cell-specific slot configuration, ii) the number of slots with only DL symbols from the beginning of the duration of the cell-specific slot configuration, iii) the number of DL symbols from the first symbol of the slot immediately following the slot with only DL symbols, iv) the number of slots with only UL symbols from the end of the duration of the cell-specific slot configuration, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot with only UL symbols by using cell-specific RRC signals. Here, a symbol that is not configured by either UL symbol or DL ​​symbol is a flexible symbol.

[0047] When information about symbol types 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 a slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of a 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 that is 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 may be signaled. In this case, the DL symbols of a slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of a 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 that is 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 a physical downlink shared channel (PDSCH) according to a physical downlink control channel (PDCCH) and information in the PDCCH, so that the UE can acquire system information that is more specific than the system information acquired through the initial cell search (S102). Here, the system information acquired by the UE is cell-common system information for the UE to operate correctly in a physical layer in a Radio Resource Control (RRC), and is also called remaining system information or system information block (SIB) 1.

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

[0052] The RRC layer is used to generate and manage messages for control between a terminal and a radio access network (RAN). More specifically, the base station and the terminal can perform storage management including broadcasting of cell system information required for all terminals in a cell, delivery management of paging messages, mobility management and handover, terminal measurement reports and control therefor, terminal capability management, and device management in the RRC layer. In general, an update of a signal transmitted in the RRC layer (hereinafter, an RRC signal) is longer than a transmission / reception period (i.e., a transmission time interval, TTI) in the physical layer, so that the RRC signal can be maintained unchanged for a long period.

[0053] After the above-described procedure, the UE receives the PDCCH / PDSCH (S107) and transmits the 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. The format of the DCI may also vary depending on the intended use. The uplink control information (UCI) that the UE transmits 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 a 3GPP NR system, the UE may transmit control information, such as HARQ-ACK and CSI, described above, via the PUSCH and / or PUCCH.

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

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

[0056] With reference to FIG. 4a, the synchronization signal (SS) will be described in more detail. The synchronization signal may be classified into PSS and SSS. The PSS may be used to obtain time domain synchronization and / or frequency domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS may be used to obtain frame synchronization and cell group ID. With reference to FIG. 4a and Table 1, the SS / PBCH block may be configured using 20 consecutive RBs (=240 subcarriers) in the frequency axis and may be configured using 4 consecutive OFDM symbols in the time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through the 56th to 182nd subcarriers. Here, the smallest 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 a physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block excluding the above signals.

[0057] [Table 1]

[0058] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, with each group specifically including three unique identifiers through the 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 IDs N cell ID =3N (1) ID +N (2) ID is an index N ranging from 0 to 335 indicating a physical layer cell identifier group (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier in the physical layer cell identifier group. (2) ID The UE may detect the PSS and identify one of the three unique physical layer identifiers. In addition, the UE may 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 of the PSS 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] Given as [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0064] Furthermore, the sequence of SSSs dSSS(n) is as follows:

[0065] d SSS (n)=[1-2x 0 ((n+m 0 ) mod 127][1-2x i ((n+m 1 ) mod 127]

[0066] m 0 =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,

[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 as:

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

[0074] 5a, 5b show a procedure for transmitting control information and control channels in a 3GPP NR system. Referring to FIG. 5a, a base station may add a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to the control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC with an RNTI value determined according to the purpose / target of each control information. The 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. Then, the base station may perform rate matching according to the amount of resources used for PDCCH transmission after performing channel coding (e.g., polar coding) (S204). Then, the base station may multiplex 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), interleaving, etc. to the multiplexed DCI (S210), and then map the DCI to resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE may include multiple (e.g., 6) resource element groups (REGs). One REG may be configured with multiple (e.g., 12) REs. The number of CCEs used for one PDCCH may be defined as an aggregation level.In a 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 may be used. Figure 5b is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control area accordingly.

[0075] FIG. 6 illustrates a control resource set (core set) in which a physical downlink control channel (PDCCH) may be transmitted in a 3GPP NR system.

[0076] A core set 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, may be mapped to one core set. Thus, instead of monitoring all frequency bands for PDCCH reception, the UE may monitor a time-frequency region designated as a core set and decode the PDCCH mapped to the core set. The base station may configure one or more core sets per cell for the UE. A core set may be configured with up to three consecutive symbols on the time axis. In addition, a core set may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 6, core set #1 is configured with consecutive PRBs, and core set #2 and core set #3 are configured with non-consecutive PRBs. A core set may be located in any symbol in a slot. For example, in the embodiment of FIG. 6, core set #1 starts in the first symbol of the slot, core set #2 starts in the fifth symbol of the slot, and core set #9 starts in the ninth symbol of the slot.

[0077] FIG. 7 illustrates a method for configuring a PUCCH search space in a 3GPP NR system.

[0078] To transmit the PDCCH to the UE, each core set may have at least one search space. In an embodiment of the present disclosure, the search space is a set of all time-frequency resources through which the PDCCH of the UE can be transmitted (hereinafter, PDCCH candidates). The search space may include a common search space that 3GPP NR UEs are required to search in common, and a terminal-specific or UE-specific search space that a specific UE is required to search. In the common search space, the UE may monitor the PDCCH that all UEs in a cell belonging to the same base station are set to search in common. In addition, a UE-specific search space may be configured for each UE, such that the UE monitors the PDCCH allocated to each UE at different search space positions according to the UE. In the case of the 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 blind decoding for PDCCH candidates in the search space. When blind decoding is successful, it may be expressed that the PDCCH is (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH is not detected / received or is not successfully detected / received.

[0079] For ease of description, a PDCCH scrambled with a group common (GC) RNTI previously known to one or more UEs to transmit DL control information to one or more UEs is referred to as a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a terminal-specific RNTI already known by a particular UE to transmit UL or DL ​​scheduling information to the particular UE is referred to as a UE-specific PDCCH. The common PDCCH may be included in a common search space, and the UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

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

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

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

[0083] [Table 2]

[0084] The PUCCH may 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: a response to the PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on the PDSCH. The HARQ-ACK indicates whether the information transmitted on the PDCCH or PDSCH has been received. The HARQ-ACK response includes a positive ACK (simply ACK), a negative ACK (hereinafter NACK), a discontinuous transmission (DTX), or a NACK / DTX. Here, the term HARQ-ACK is used in conjunction with HARQ-ACK / NACK and ACK / NACK. In general, an ACK may be represented by a bit value of 1 and a NACK by a bit value of 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). The CSI may be split into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0088] In the 3GPP NR system, five PUCCH formats may be used to support different service scenarios, different 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 in two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. In this case, the sequence may be a cyclic shifted (CS) sequence from a base sequence used in PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal bit Bit UCI(M bit =1 or 2) to determine the cyclic shift (CS) value m cs Also, the length 12 basic sequence can be determined by the specified CS value m cs Based on this, the cyclically shifted sequence can be mapped to 12 REs of one OFDM symbol and one RB and transmitted. bit If M = 1, then one bit UCI 0 and 1 can be mapped to two cyclic shifted sequences whose cyclic shift value difference is 6, respectively. bit For .times. ...

[0090] PUCCH format 1 carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. bit The UCI, where M = 1, is modulated by BPSK. bitThe UCI, where d(0) is a 12-bit number, is modulated with quadrature phase shift keying (QPSK). A signal is obtained by multiplying the modulated complex valued symbol d(0) with a sequence of length 12. The terminal transmits the resulting signal by spreading it with a time-domain orthogonal cover code (OCC) on the even-numbered OFDM symbols to which PUCCH format 1 is assigned. In PUCCH format 1, the maximum number of different terminals that can be multiplexed in the same RB is determined according to the length of the OCC used. A demodulation reference signal (DMRS) is spread with OCC and mapped to odd-numbered OFDM symbols in PUCCH format 1.

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

[0092] PUCCH format 3 or PUCCH format 4 may deliver UCI that is greater than 2 bits. PUCCH format 3 or PUCCH format 4 may be transmitted over 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 may transmit the UCI using π / 2-2 phase shift keying (BPSK) or QPSK. bit The complex-valued symbols d(0) to d(M symb -1), where M symb =M bit When using QPSK, M symb =M bit / 2. The UE may not apply block-wise spreading to PUCCH format 3. However, the UE may apply block-wise spreading to one RB (i.e., 12 subcarriers) using PreDFT-OCC with length 12, such that PUCCH format 4 may have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on ​​the spread signal and maps it to each RE to transmit the spread signal.

[0093] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of the UCI transmitted by the UE. 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 may transmit is greater than the maximum number of RBs that PUCCH format 2, or PUCCH format 3, or PUCCH format 4 may 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 may be configured through RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, an index of the RB to be frequency hopped may be configured using RRC signaling. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over 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 may be configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted may be configured by RRC signaling. The repeatedly transmitted PUCCH must start at a fixed OFDM symbol in each slot and must have a constant length. When one of the OFDM symbols of a slot in which the UE should transmit the PUCCH is indicated as a DL symbol by RRC signaling, the UE may not transmit the PUCCH in the corresponding slot and may delay the transmission of the PUCCH until the next slot for transmitting the PUCCH.

[0096] Meanwhile, 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). To this end, the terminal may be configured with a BWP (bandwidth part) consisting of a continuous bandwidth of a part of the bandwidth of the carrier. A terminal operating according to TDD or in an unpaired spectrum may be configured with up to four DL / UL BWP pairs in one carrier (or cell). Also, the terminal may activate one DL / UL BWP pair. A terminal operating according to FDD or in a paired spectrum may be configured with up to four DL BWPs in a downlink carrier (or cell) and up to four UL BWPs in an uplink carrier (or cell). The terminal may activate one DL BWP and one UL BWP for each carrier (or cell). The terminal does not need to receive or transmit in time-frequency resources other than the activated BWP. An activated BWP may be referred to as an active BWP.

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

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

[0099] Carrier aggregation is a method in which a UE uses multiple 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 so that a wireless communication system can use a wider frequency band. One component carrier may be called a primary cell (PCell) or a secondary cell (SCell), or a primary SCell (PScell). However, in the following, for convenience of explanation, the term "component carrier" is used.

[0100] Referring to Figure 8, as an example of a 3GPP NR system, the overall system band 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 contiguous subcarriers. Although each of the component carriers is shown in Figure 8 to have 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 adjacent to each other in the frequency axis, the drawing is shown in a logical concept and each component carrier may be physically adjacent to each other or spaced apart.

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

[0102] When the entire system band is expanded by carrier aggregation, the frequency band used for communication with each UE may be specified in units of component carriers. UE A may use 100 MHz of the entire system band and perform communication using all five component carriers. UE B 1 ~B 5 The UE can only use the 20 MHz bandwidth and can perform communication using one component carrier. 1 and C 2 may use a 40 MHz bandwidth and each of the UECs may perform communication using two component carriers. 1 uses two non-adjacent component carriers, and UEC2 This shows the case where two adjacent component carriers are used.

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

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

[0105] A base station may perform communication with a UE by activating some or all of the serving CCs of the UE, or by deactivating some CCs. The base station may change the CCs to be activated / deactivated, and may change the number of CCs to be activated / deactivated. If the base station allocates CCs available to the UE as cell-specific or UE-specific, at least one of the allocated CCs may be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. The one CC that is not deactivated by the UE is called a Primary CC (PCC) or a Primary Cell (PCell), and the CC that the base station can activate / deactivate freely is called a Secondary CC (SCC) or a Secondary Cell (SCell).

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

[0107] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring 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 a cell referring to several geographical areas and a cell of carrier aggregation, in this disclosure, a cell of carrier aggregation is called a CC, and a cell of a geographical area is called a cell.

[0108] FIG. 10 illustrates an example in 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 a first CC or a 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 the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists in the PDCCH area of ​​the scheduling cell. A PCell may be essentially a scheduling cell, and a specific SCell may be designated as a scheduling cell by higher layers.

[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 a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured to the PDCCH monitoring CC. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC can only transmit a PDCCH for scheduling its PDSCH without a CIF according to the NR PDCCH rules (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) higher layer signaling, the CIF is enabled, and a certain CC (e.g., DL PCC) may transmit not only a PDCCH for scheduling a PDSCH of DL CC A using the CIF, but also a PDCCH for scheduling a PDSCH of another CC (cross-carrier scheduling). On the other hand, the PDCCH is not transmitted in another DL CC. Thus, the UE monitors either the PDCCH without a CIF to receive a self-carrier scheduled PDSCH or the PDCCH with a CIF to receive a cross-carrier scheduled PDSCH, depending on whether cross-carrier scheduling is configured for the UE.

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

[0111] FIG. 11 is a block diagram showing 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 may be embodied as various wireless communication devices or computer devices that are guaranteed to be portable and mobile. The terminal may also be called User Equipment (UE), Station (STA), Mobile Subscriber (MS), etc. In addition, in an embodiment of the present disclosure, the base station may control and manage cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area, and may have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may also be called next generation Node B (gNB) or Access Point (AP), etc.

[0112] As shown, the terminal 100 according to one embodiment of the present disclosure may 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 to process data within the terminal 100. The processor 110 can also control the overall operation of the terminal 100 including each unit, and control data transmission and reception between the units. Here, the processor 110 may be configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 110 can receive slot configuration information, determine the slot configuration based on the information, 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 may include a plurality of network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123 in an internal or external form. Although the communication module 120 is shown as an integrated module in the figure, each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawing.

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

[0116] The cellular communication interface card 122 can transmit and receive wireless signals to and from at least one of the base station 200, the external device, and the server using a mobile communication network, and can provide a cellular communication service in the second frequency band based on instructions from the processor 110. According to an embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band of 6 GHz or higher. The 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, the external device, and the server according to a 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 to and from at least one of the base station 200, the external device, and the server using the third frequency band, which is an unlicensed band, and provides communication services in the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module using the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 may perform wireless communication with at least one of the base station 200, the external device, and the server, independently or dependently, according to an unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

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

[0119] Next, the user interface 140 includes various types 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 an instruction of the processor 110 using various output means.

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

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

[0122] First, the processor 210 can execute various instructions or programs to process data within the base station 200. The processor 210 can also control the overall operation of the base station 200 including each unit, and control data transmission and reception between the units. Here, the processor 210 may be configured to perform 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 an unlicensed band communication interface card 223, in an internal 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 depending on the circuit configuration or application, unlike the drawing.

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

[0125] The cellular communication interface card 222 can transmit and receive wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and can provide a cellular communication service in the second frequency band based on instructions from the processor 210. According to an embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band of 6 GHz or higher. The 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 a 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 to and from at least one of the terminal 100, the external device, and the server using the third frequency band, which is an unlicensed band, and provides communication services of the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module using the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 may perform wireless communication with at least one of the terminal 100, the external device, and the server, independently or dependently, according to an 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 displayed blocks are used to logically distinguish the elements of the devices. Therefore, the above-mentioned device elements may be implemented as one chip or multiple chips depending on the design of the device. In addition, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. In addition, the user interface 140 and the display unit 150 may be further provided in the base station 200 as necessary.

[0128] Reception of SSB in SMTC

[0129] An exemplary problem addressed by the present invention concerns the reception of SSB in an SMTC. The terminal in this embodiment corresponds to the terminal 100 according to Fig. 11. Thus, 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 according to Fig. 11. Thus, 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 terminal's active bandwidth part. There may be limitations on scheduling flexibility when the subcarrier spacing of the measurement signal is different from the PDSCH / PDCCH or in the frequency range FR2.

[0131] More specifically, if the subcarrier spacing of the measurement signal in the frequency range FR1 is the same as the PDSCH / PDCCH, there is no restriction on scheduling availability. If the subcarrier spacing of the measurement signal in the frequency range FR1 is different from the PDSCH / PDCCH, the following scheduling availability restrictions may apply. First, if the terminal can receive synchronization signal blocks (SSBs) and data signals with different subcarrier spacings (i.e., if the terminal supports simultaneousRxDataSSB-DiffNumerology), there is no scheduling availability restriction. Conversely, if the terminal cannot receive synchronization signal blocks (SSBs) and data signals with different subcarrier spacings (i.e., if the terminal does not support simultaneousRxDataSSB-DiffNumerology), the terminal has a restriction 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 is not expected to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on consecutive SSB symbols within the SMTC (SSB Measurement time configuration) window, or on the symbol immediately preceding and immediately following these consecutive SSB symbols.

[0133] 2) If deriveSSB_IndexFromCell is disabled, the terminal is not expected to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on any symbol within the SSB Measurement time configuration (SMTC) 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 measurements in the frequency range FR2, the following scheduling availability restrictions apply:

[0136] 1) The terminal is not expected to receive a PDCCH / PDSCH or transmit a PUCCH / PUSCH in consecutive SSB symbols or in one symbol immediately preceding and one symbol immediately following these consecutive SSB symbols within the SMTC (SSB Measurement time configuration) window.

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

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

[0139] In the above description, the SMTC window follows smtc2 if smtc2 is configured from the upper layer, otherwise it follows smtc1.

[0140] The problem to be addressed in the present invention is to determine a slot for repeatedly transmitting a PUCCH in accordance with the scheduling availability limitation when the terminal has a scheduling availability limitation for receiving a measurement signal. More specifically, when the terminal is configured to repeatedly transmit a PUCCH K times, the terminal must determine K slots for repeatedly transmitting the PUCCH.

[0141] Assume that a terminal is configured with carrier aggregation or dual connectivity that aggregates and transmits signals from two or more cells. For convenience, assume that the terminal is configured with two cells. The following description is also applicable to the case where the terminal is configured with two or more cells. Let one of the two cells be Pcell. The Pcell is a cell from which the terminal transmits a PUCCH. Let the other of the two cells be Scell. The Scell ​​is a cell from which the terminal does not transmit a PUCCH. A measurement signal may be configured in the Scell.

[0142] The terminal may be configured with a MeasObjectNR IE (information element) from a higher layer. The MeasObjectNR IE includes information for intra / inter-frequency measurements. 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 on 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 embodiment of the present invention, when a terminal is configured to repeatedly transmit a PUCCH in K slots, a method of determining K slots for the terminal to transmit a PUCCH is as follows. As a first method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window, the terminal does not include the slot in the K slots for transmitting a PUCCH. As a second method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window by one symbol immediately after the measurement signal, the terminal does not include the slot in the K slots for transmitting a PUCCH. As a third method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window by one symbol immediately after or immediately before the measurement signal, the terminal does not include the slot in the K slots for transmitting a PUCCH. Furthermore, the above operation can be applied only when scheduling availability is limited.

[0144] In yet another embodiment of the present invention, the terminal is configured to repeatedly transmit the PUCCH in K slots, and after determining the K slots for transmitting the PUCCH, the PUCCH transmission in the SMTC window is as follows. As a first method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window by one symbol immediately after the measurement signal, the terminal does not transmit the PUCCH in the slot. As a second method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window by one symbol immediately after the measurement signal, the terminal does not transmit the PUCCH in the slot. As a third method, if a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured in MeasObjectNR) in the SMTC window by one symbol immediately after or immediately before the measurement signal, the terminal does not transmit the PUCCH in the slot. Furthermore, the above operation can be applied only when the scheduling availability is limited.

[0145] Yet another problem to be solved by the present invention is to determine slots for PUCCH repeated transmission 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 at the same time. That is, when the terminal transmits in one cell, it cannot receive in another cell. Also, when the terminal receives in one cell, it cannot transmit in another cell. Therefore, the terminal must operate in only one direction, either transmission or reception. More specifically, the problem to be solved is how the terminal determines K slots to transmit PUCCH when there is a measurement signal to be received in Pcell / Scell ​​and the terminal is configured to repeatedly transmit PUCCH in K slots in Pcell. If the terminal determines K slots to transmit PUCCH in Pcell without considering the measurement signal to be received in Pcell / Scell, the terminal must transmit PUCCH in Pcell in some slots and receive measurement signals in Pcell / Scell. This is possible for a terminal with full-duplex capability, but is impossible for a terminal with only half-duplex capability. For this reason, the terminal must take into consideration the measurement signal of the Pcell / Scell ​​in order to determine the slot in which to transmit the PUCCH.

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

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

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

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

[0150] PUSCH repetitive transmission

[0151] In the enhanced ultra reliable low latency communication (eURLLC) under development in 3GPP NR Release 16, various techniques for providing a service 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, a method is planned in which a terminal repeatedly transmits a physical uplink shared channel (PUSCH) to a base station as soon as possible. According to one aspect of the present invention, a method is disclosed in which a terminal repeatedly transmits a physical uplink shared channel (PUSCH) as soon as possible.

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

[0153] 3GPP NR Release 15 supports inter-slot repetitive transmission of PUSCH. First, the number of repetitive transmissions may be set in the terminal from the base station. Let the number of repetitive transmissions set in the terminal be K. When the terminal receives a PDCCH (or DCI) that schedules a PUSCH in slot n and is instructed to transmit a PUSCH in slot n+k, the terminal can transmit a PUSCH in K consecutive slots starting from slot n+k. That is, the terminal can transmit a PUSCH in slot n+k, slot n+k+1, ..., slot n+k+K-1. The time and frequency resources in which the PUSCH is transmitted in each slot are the same as those instructed by the DCI. That is, the PUSCH may be transmitted in the same symbol and the same PRB in the slot. To obtain diversity gain in the frequency domain, frequency hopping may be configured in the terminal. As for frequency hopping, intra-slot frequency hopping, which performs frequency hopping within a slot, and inter-slot frequency hopping, which performs frequency hopping for each slot, can be set. If intra-slot frequency hopping is set in the terminal, the terminal divides the PUSCH in half in the time domain in each slot, transmits one half using a scheduled PRB, and transmits the other half using a PRB obtained by adding an offset value to the scheduled PRB. Here, two or four values ​​may be set as the offset value in the higher layer, and one of the values ​​may be indicated by the DCI. If inter-slot frequency hopping is set in the terminal, the terminal transmits the PUSCH using a scheduled PRB in odd-numbered slots in which the PUSCH is transmitted, and transmits the PUSCH using a PRB obtained by adding an offset value to the scheduled PRB in even-numbered slots. When the terminal performs repeated transmission in a slot, if a symbol in which a PUSCH is to be transmitted in a particular slot is configured as a semi-static DL symbol, the terminal does not transmit a PUSCH in the slot.The PUSCH that could not be transmitted is deferred to another slot and not transmitted.

[0154] The reasons why the aforementioned Rel-15 repetitive transmission is not suitable for providing eURLLC services are as follows:

[0155] First, it is difficult to provide high reliability. For example, if one slot is composed of 14 symbols and PUSCH is transmitted with symbols 12 and 13, it is repeatedly transmitted with symbols 12 and 13 in the next slot. Although it is possible to transmit with symbols 1 to 11 in the next slot, no transmission is performed, so it is difficult to obtain high reliability.

[0156] Secondly, it is difficult to provide a high level of low latency. For example, assume that one slot is composed of 14 symbols and PUSCH is transmitted from symbol 0 to symbol 13 to obtain high reliability. In order for the base station to successfully receive the PUSCH, it must receive the last symbol of the PUSCH, i.e., symbol 13. Therefore, a problem occurs in that the latency increases according to the length of the PUSCH.

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

[0158] Mini-slot-level PUSCH repetition transmission can solve the problems in the slot-level PUSCH repetition transmission method mentioned above.

[0159] First, it provides high reliability. For example, if one slot consists of 14 symbols and PUSCH is transmitted with symbols 12 and 13, it is repeatedly transmitted with symbols 1 and 2 in the next slot. Therefore, since the transmissions are immediately consecutive, high reliability can be obtained.

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

[0161] An exemplary problem to be solved by the present invention relates to a case where a mini-slot-level PUSCH repeat transmission is continuously repeated in another slot beyond a slot. As described above, in the case of a mini-slot-level PUSCH repeat transmission, the next PUSCH repeat transmission starts from a symbol immediately after one PUSCH transmission ends. However, a case where continuous transmission is not possible may occur in the following situation.

[0162] The first situation to be considered is when a semi-static DL symbol overlaps with the symbol occupied by the PUSCH when transmitting the PUSCH from the symbol immediately following the symbol where the PUSCH transmission ends. In this case, the symbol to transmit the PUSCH overlaps with the semi-static DL symbol, so the PUSCH cannot be transmitted from the immediately following symbol. Therefore, the PUSCH must be repeatedly transmitted in another symbol.

[0163] The second situation to be considered is when a PUSCH crosses a slot boundary when the PUSCH is transmitted from the symbol immediately following the symbol where the PUSCH transmission ends. It is not permitted for one PUSCH to cross a slot boundary, and the PUSCH must be transmitted in another symbol.

[0164] According to one aspect of the present invention, a PUSCH repeated transmission method taking the above situation into consideration is disclosed.

[0165] According to an embodiment of the present invention, when the terminal is configured to perform mini-slot-level PUSCH repeated transmission, the terminal transmits PUSCH at a symbol immediately after one PUSCH transmission. At this time, if the PUSCH is not transmitted (as described above, for example, if the symbol for transmitting the PUSCH overlaps with a semi-static DL symbol or crosses a slot boundary), the terminal can transmit PUSCH at the earliest symbol that can be transmitted, or can transmit PUSCH repeatedly except for symbols that cannot be used for PUSCH repeated transmission. Here, the earliest symbol that can be transmitted refers to, for example, a case where the PUSCH does not overlap with a semi-static DL symbol or crosses a slot boundary.

[0166] Fig. 12 is a flowchart showing a method in which a terminal repeatedly transmits a 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. Thus, 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, a terminal receives a radio resource control (RRC) signal from a base station (S1200). The RRC signal may include configuration information regarding semi-static downlink symbols. Such configuration information may designate a specific symbol as a semi-static downlink symbol.

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

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

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

[0171] The case where the PUSCH repetition cannot be transmitted includes, for example, a case where at least one of the number of symbols required for transmitting the PUSCH repetition is a symbol designated as a semi-static downlink symbol by configuration information included in the RRC signal. That is, a symbol designated as a downlink symbol by the RRC signal may be considered as an invalid symbol for the PUSCH repetition. According to one aspect, the case where the PUSCH cannot be transmitted may further include a case where at least one of the number of symbols required for transmitting the PUSCH repetition is located before a slot boundary and at least one is located after a slot boundary. According to another aspect, the terminal may receive information on at least one symbol on which the PUSCH repetition cannot be transmitted from the base station through an RRC signal (S1200), and the case where the PUSCH repetition cannot be transmitted may include a case where the PUSCH repetition cannot be transmitted according to information on at least one symbol on which the PUSCH repetition cannot be transmitted received through an RRC signal from a PDCCH that schedules the PUSCH. That is, the terminal may perform a setting for a case where the PUSCH repetition cannot be transmitted according to a parameter of an upper layer (e.g., an RRC layer).

[0172] Meanwhile, in FIG. 12, in step S1200, RRC signal transmission including configuration information regarding semi-static DL symbols and / or information regarding symbols on which PUSCH repetition cannot be transmitted is shown as one step for convenience, but the signaling time of the configuration information regarding semi-static DL symbols and the information regarding symbols on which PUSCH repetition cannot be transmitted may be the same, or the configuration information regarding semi-static DL symbols and the information regarding symbols on which PUSCH repetition cannot be transmitted may be signaled at different times.

[0173] 12 again, when it is determined whether each PUSCH repetition cannot be transmitted, the terminal transmits each PUSCH repetition to the base station based on such determination (S1220). For example, the terminal may transmit the PUSCH repetition except for at least one symbol in which the PUSCH repetition cannot be transmitted. Alternatively, the terminal may transmit the PUSCH repetition in the earliest symbol in which the PUSCH repetition can be transmitted.

[0174] FIG. 13 is a diagram illustrating the relationship between downlink symbols, slot boundaries, and PUSCH repetition. With reference to FIG. 13, for example, assume that a terminal is configured to transmit four repetitions in mini-slot-level PUSCH repetition, and is instructed by PDCCH (or DCI) to transmit PUSCH over four symbols starting from the fifth symbol of a slot. In the figure, D, U, and F represent downlink symbols, uplink symbols, and flexible symbols in semi-static DL / UL configuration. According to an embodiment of the present invention, a terminal can transmit PUSCH repetitions at symbols 5, 6, 7, and 8 of a slot, and check whether PUSCH repetitions can be transmitted at the immediately following symbols 9, 10, 11, and 12. If transmission is possible (i.e., for example, without overlapping with a semi-static DL symbol and without crossing a slot boundary), the terminal can transmit PUSCH repetitions at symbols 9, 10, 11, and 12. The next PUSCH starting from symbol 13 cannot be transmitted because it crosses a slot boundary and overlaps with a semi-static DL symbol. The next transmittable symbols are symbol 3, symbol 4, symbol 5, and symbol 6 in the next slot. These symbols are flexible symbols and can be transmitted. Therefore, the third PUSCH repetition is transmitted in these symbols. The fourth PUSCH repetition is transmitted in the following symbols 7, symbol 8, symbol 9, and symbol 10. Having transmitted four PUSCH repetitions, the terminal does not transmit any more repetitions.

[0175] 14 is a diagram illustrating a relationship between a threshold number or less of flexible symbols following a semi-static DL symbol and PUSCH repetitions. According to one aspect of the present invention, when a certain symbol cannot transmit a PUSCH repetition, it may include a case where at least one of the number of symbols required to transmit a PUSCH repetition is a threshold number or less of flexible symbols following a semi-static DL symbol.

[0176] More specifically, according to an embodiment of the present invention, when a terminal is configured to transmit a mini-slot-level PUSCH repetition, the terminal can transmit a PUSCH repetition in a symbol immediately after one PUSCH repetition transmission. In this case, if a PUSCH repetition cannot be transmitted (for example, if it overlaps with a semi-static DL symbol, X flexible symbols immediately after the semi-static DL symbol, or if it crosses a slot boundary), the terminal can transmit the PUSCH repetition except for the symbol in which the PUSCH repetition cannot be transmitted, or transmit the PUSCH repetition in the earliest symbol that can be transmitted. Here, the earliest symbol that can be transmitted refers to a case in which the PUSCH repetition does not overlap with a semi-static DL symbol, does not overlap with X flexible symbols immediately after the semi-static DL symbol, and does not cross a slot boundary. With reference to FIG. 14, it is assumed that a terminal is configured to transmit four repetitions in a mini-slot-level PUSCH repetition and is instructed by a PDCCH (or DCI) to transmit a PUSCH over four symbols starting from the fifth symbol of a slot. In the figure, D, U, and F denote downlink symbols, uplink symbols, and flexible symbols in semi-static DL / UL configuration. According to an embodiment of the present invention, the terminal transmits PUSCH repetitions at symbol 5, symbol 6, symbol 7, and symbol 8 of a slot, and checks whether PUSCH repetitions can be transmitted at the immediately following symbols 9, 10, 11, and 12. If the transmission is possible (i.e., it does not overlap with a semi-static DL symbol, does not overlap with the X flexible symbols immediately after the semi-static DL symbol, and does not cross the slot boundary), the terminal can transmit PUSCH repetitions at symbol 9, symbol 10, symbol 11, and symbol 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. Figure 14(a) shows the case where X=1, and Figure 14(b) shows the case where X=2. Referring to Figure 14(a), the next transmittable symbols are symbol 4, symbol 5, symbol 6, and symbol 7 of the next slot. These symbols can be transmitted since they are flexible symbols, so the third PUSCH repetition is transmitted in these symbols.The terminal transmits the next PUSCH repetition at symbol 8, symbol 9, symbol 10, and symbol 11. Having completed transmission of four PUSCH repetitions, the terminal does not transmit any more repetitions. Referring to FIG. 14(b), the next transmittable symbols are symbol 5, symbol 6, symbol 7, and symbol 8 in the next slot. These symbols are flexible symbols or semi-static UL symbols, so they can be transmitted. Therefore, the third PUSCH repetition is transmitted at this symbol. The terminal transmits the fourth PUSCH repetition at the next symbols 9, symbol 10, symbol 11, and symbol 12. Having completed transmission of four repetitions, the terminal does not transmit any more repetitions.

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

[0178] More specifically, according to an embodiment of the present invention, if an SS / PBCH block is configured in a cell that transmits a PUSCH repetition, or if an SS / PBCH block for measurement is configured in another cell and measurement must be performed, the UE may process a symbol corresponding to the SS / PBCH block as a semi-static DL symbol. For example, in addition to the semi-static DL symbol in the previous embodiment in which a PUSCH repetition cannot be transmitted, or the semi-static DL symbol overlaps with X flexible symbols immediately after the semi-static DL symbol, or crosses a slot boundary, the UE may include a symbol overlapping with the SS / PBCH block and X flexible symbols immediately after the symbol overlapping with the SS / PBCH block in the case where a PUSCH repetition cannot be transmitted.

[0179] As described above, according to an embodiment of the present invention, a terminal configured to transmit PUSCH K times can postpone PUSCH repetition until it finds a transmittable symbol, until it transmits PUSCH K times. However, postponing PUSCH repetition for too long does not match the synchronization supporting mini-slot-level PUSCH repetition. In other words, even though mini-slot-level PUSCH repetition is a method for supporting uplink URLLC service, postponing PUSCH repetition for too long already violates the requirements of URLLC service. In addition, because of the operation of postponing PUSCH repetition for too long and transmitting PUSCH repetition, the base station cannot use the corresponding resource for other terminals, resulting in waste of network resources. Therefore, another problem to be solved by the present invention relates to a condition for terminating transmission in mini-slot-level PUSCH repetition.

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

[0181] FIG. 15 is a diagram for explaining a condition for ending transmission of PUSCH repetitions.

[0182] As a first termination condition, a PUSCH repetition may be interrupted in response to a PUSCH having the same HARQ process number (HPN) as the PUSCH repetition to be transmitted being scheduled. That is, the terminal may interrupt a previous PUSCH repetition when a new PUSCH having the same HPN as the PUSCH repetition to be repeatedly transmitted is scheduled. More specifically, referring to FIG. 15(a), when the PUSCH to be repeatedly transmitted is scheduled, the scheduling information includes HPN=i. If another PDCCH (or DCI) that schedules the PUSCH (DCI format 0_0 or 0_1) has the same HPN (HPN=i) as the HPN, or if new data indication (NDI) is toggled, the previous PUSCH repetition may not be transmitted after the PDCCH. Furthermore, since it takes processing time to receive the PDCCH and cancel the PUSCH repetition, the PUSCH repetitions 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 PUSCH repetition to be repeatedly transmitted, the terminal may not transmit the PUSCH repetition. More specifically, referring to FIG. 15(b), the transmission of the previous PUSCH repetition may be terminated by scheduling the PDCCH to overlap with the previously scheduled PUSCH in the time domain.

[0184] As a third termination condition, the terminal may not transmit any more PUSCH repetitions if it receives an explicit HARQ-ACK for the repeatedly transmitted PUSCH. The explicit HARQ-ACK is information that the base station uses to inform the terminal of the success or failure of the PUSCH transmission via another channel.

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

[0186] FIG. 16 is a diagram for explaining a method of counting the number of PUSCH repetitions. Another embodiment of the present invention relates to a method for counting the number of PUSCH repetitions transmitted by a terminal configured to transmit a PUSCH K times. In the above description, the terminal increases the number of PUSCH repetitions transmitted by repeating only when the PUSCH repetition is actually transmitted. However, as described above, a PUSCH delay that is too long to transmit K times may occur. To solve this problem, according to one embodiment of the present invention, the following counting rule is disclosed.

[0187] The first counting rule is as follows. If the terminal actually transmits a PUSCH repetition, it counts. Also, if the terminal is unable to transmit within Y symbols, it counts. If the number of PUSCH repetitions exceeds K after counting, the PUSCH repetition is not transmitted any more. Here, Y symbols may be the number of symbols allocated to the PUSCH repetition. As another example, Y symbols may be the number of symbols included in one slot. As another example, Y symbols may be a value configured by a higher layer. FIG. 16(a) shows the number of PUSCH repetitions obtained by the first counting rule. Here, it is assumed that K=4 is configured as the number of PUSCH repetitions in the terminal. And, Y=5 is configured. The terminal does not transmit a PUSCH repetition in the last symbol of the first slot and the first four symbols of the second slot, but must count because it was unable to transmit within Y=5 symbols. Then, the terminal can transmit the last fourth PUSCH repetition in symbols 4, 5, 6, and 7 of the second slot.

[0188] The second counting rule is as follows. If the terminal actually transmits a PUSCH repetition, it counts. Also, if the terminal is unable to transmit any PUSCH repetition in Z slots, it counts. If the counting exceeds the number of PUSCH repetitions K, the PUSCH repetition is not transmitted any more. Here, Z slots may preferably be 1 slot. As another example, Z slots may be a value configured by a higher layer. FIG. 16(b) shows the number of PUSCH repetitions obtained by the second counting rule. Here, the number of PUSCH repetitions K=4 is configured in the terminal. Then, it is assumed that Z=1 is configured. The terminal does not transmit a PUSCH repetition in the second slot, but counts because it was unable to transmit during Z=1 slots. Then, the terminal can transmit the last fourth PUSCH repetition in symbols 10, 11, 12, and 13 of the third slot.

[0189] According to the 3GPP TS38.213 standard document, the PUSCH for transmitting uplink data by the terminal cannot cross the slot boundary. That is, the start symbol and the end symbol of the scheduled PUSCH must always be located in the same slot (in the case of PUSCH repetition, the start symbol and the end symbol may be located in different slots, but here, we will deal with general PUSCH transmission except for the case of repeated transmission). More specifically, the base station informs the terminal of information regarding the symbols that the PUSCH can transmit by using a starting and length indication value (SLIV). The SLIV can inform the position (represented as S, which may have one of values ​​0, 1, 2, ..., 13) and length (represented as L, which may have one of values ​​1, 2, ..., 14) of the starting symbol in the slot. The SLIV value is characterized by having one of values ​​S+L=1, 2, ..., 14. If a combination of S+L>14 is used, the start symbol and the end symbol can be located in the same slot. For example, if S=5 and L=10, it starts from the 6th symbol of a slot and has a length of 10 symbols, so one symbol becomes the first symbol of the next slot. Therefore, the start symbol and the last symbol are located in different slots. Referring to 3GPP TS38.213, SLIV can be obtained from the following Equation 1.

[0190] [Formula 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 service, 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 insufficient, the transmission of PUSCH repetitions must be scheduled in the next slot. This generates a delay time until the transmission of the next slot, and is therefore not suitable for URLLC service. A method required to solve this problem 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, a method for designing SLIV that can be scheduled across slot boundaries is disclosed.

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

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

[0199] According to the above method, if there is a symbol that cannot be used for uplink transmission, the length of the PUSCH is reduced. To prevent this, if the PUSCH overlaps with a symbol that cannot be transmitted in uplink, the PUSCH can be transmitted by shifting the symbol that can be transmitted in uplink after the symbol that cannot be transmitted in uplink. For example, referring to FIG. 17(c), if the first two symbols of the second slot are symbols that cannot be transmitted in uplink, the UE can transmit the second PUSCH repetition with six symbols that can be transmitted in uplink after these two symbols. In this way, the PUSCH repetition is postponed, but the number of symbols allocated to the PUSCH repetition can be maintained, so that the deterioration of the reception performance of the PUSCH can be prevented.

[0200] A method for designing a SLIV according to one aspect of the present invention is as follows.

[0201] According to one embodiment of the present invention, the SLIV may be designed to satisfy the following condition: the position S of the starting symbol may have any one of values ​​0, 1, ..., 13, and the length L of the entire PUSCH may have any one of values ​​1, 2, ..., 14, where the value of S+L may have any value from 1 to 27 without any other constraint. The formula 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 we assume that SLIV=S+14*(L-1) is used to calculate SLIV, then S can be calculated as the remainder when SLIV is divided by 14 (S=SLIV mod 14), and L can be calculated by adding 1 to the quotient obtained by dividing SLIV by 14 (L=floor(SLIV / 14)+1). If we assume that SLIV=L-1+14*S is used to calculate SLIV, then L can be calculated as the remainder when SLIV is divided by 14 and adding 1 to the quotient (L=(SLIV mod 14)+1), and S can be calculated as the quotient obtained by dividing SLIV by 14 (S=floor(SLIV / 14)).

[0205] When the SLIV is determined in the above manner, the terminal can be scheduled beyond the boundary of one slot. However, when scheduling in the above manner, it is not possible to schedule up to the last symbol of the second slot (the first slot is the one before the slot boundary and the second slot is the one after the slot boundary). This is inefficient in terms of frequency usage efficiency because only some of the symbols are used even though there are symbols available in the second slot. To solve this problem, one embodiment of the present invention is as follows.

[0206] The position S of the start symbol may have any one of values ​​0, 1, ..., 13, and the length L of the entire PUSCH may have any one of values ​​1, 2, ..., 28. Here, the value of S + L must be equal to or less than 28. For reference, here, L = 28 is possible, 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 finding the SLIV that satisfies this condition is as follows:

[0207]

number

[0208] More generally, the position S of the starting symbol may have one of the values ​​0, 1, ..., B, and the length L of the entire PUSCH may have one of the values ​​1, 2, ..., A, where the value of S+L must be equal to or less than A. The formula for determining 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, and 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 a value such as 14, 28, or 42. 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 a value such as 13, 27, or 41.

[0211] According to another embodiment of the present invention, the SLIV value of the existing formula 1 can be multiplied by an integer to obtain a SLIV value that crosses a slot boundary. The position S of the start symbol may have any one of values ​​0, 1, ..., 13, and the length L of the entire PUSCH may have any one of values ​​2, 4, 6, ..., 28. Here, the value of S+L must be equal to or smaller than 28. The formula for obtaining the SLIV that satisfies this condition is as follows: Here, L=2*X can be obtained, and X=1, 2, 3, ..., 14 can be obtained. This method can be scheduled beyond the slot boundary by doubling the length obtained in formula 1. In general, L=A*X can be obtained, and A can be determined to be any one of natural numbers equal to or greater than 2.

[0212]

number

[0213] This method is superior in terms of overhead since the SLIV analysis method is similar to that of Equation 1 and the SLIV is expressed by the same number of bits.

[0214] In still another embodiment of the present invention, according to Equation 1, the possible values ​​of SLIV are 0, 1, ..., 104, which is a total of 14*15 / 2=105. This may be expressed by 7 bits. Since 7 bits can express 0, 1, ..., 127, a total of 23 values, 105, 106, ..., 127, are not used. According to one embodiment of the present invention, the base station can schedule beyond the slot boundary using 23 values, SLIV=105 to 127. More specifically, when SLIV=105, 106, ..., 127, the values ​​of the position S of the start symbol and the length L may be determined in advance. For example, when SLIV=105, it may be determined as S=7 and L=14.

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

[0216] FIG. 18 is a diagram illustrating 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, a base station transmits time domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repetition of a PUSCH to a terminal. Then, transmits the number of repetitions K. The terminal determines a symbol at which the PUSCH repetition is transmitted based on the received information. Here, the next PUSCH repetition is transmitted consecutively from the symbol immediately after the first PUSCH repetition. If one PUSCH repetition crosses a slot boundary, the PUSCH repetition may be divided based on the slot boundary. Also, if one PUSCH repetition overlaps with a DL symbol or an SS / PBCH block configured in a semi-static UL / DL configuration, the terminal may transmit the PUSCH repetition with a symbol that does not overlap with the DL symbol. Furthermore, the terminal may also exclude a flexible symbol immediately after a DL symbol configured in a semi-static UL / DL configuration from the PUSCH repetition. Referring to FIG. 18, the index of the start symbol of the first PUSCH repetition is 4, and when the length is 4 and the number of repetitions is 5, the third PUSCH repetition crosses the slot boundary, so the PUSCH repetitions are divided based on the slot boundary. In this manner, when the PUSCH repetition is divided at the slot boundary, the number of symbols in one PUSCH repetition may be too small. To solve this problem, according to one embodiment of the present invention, if the PUSCH repetition is configured with only one symbol, the terminal may not transmit the PUSCH repetition. This is because if the PUSCH repetition is configured with only one symbol, data other than the DM-RS cannot be transmitted in the corresponding symbol. Furthermore, if the number of symbols transmitted by the PUSCH repetition is less than or equal to the number of DM-RS symbols to be transmitted in the PUSCH repetition, the terminal may not transmit the PUSCH repetition.

[0217] FIG. 19 is a diagram illustrating 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, a base station transmits time domain resource allocation information (S: start symbol index, L: length) for PUSCH to a terminal. Then, transmits the number of repetitions K. The base station checks whether L*K symbols from the start symbol above cross the slot boundary. If the slot boundary is not crossed, the first PUSCH repetition is composed of L symbols starting from the start symbol, and the following K-1 PUSCH repetitions can occupy L symbols starting consecutively from the symbol immediately after the first PUSCH repetition. If the slot boundary is crossed, the terminal can divide the PUSCH repetition into L*K symbols based on the slot boundary. 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. Thus, in FIG. 19, two PUSCH repetitions may be transmitted.

[0218] FIG. 20 is a diagram illustrating 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 time domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repetition of the PUSCH to the terminal. Then, transmits the number of repetitions K. The terminal determines the symbol at which the PUSCH repetition is transmitted based on the received information. Here, the next PUSCH repetition is transmitted consecutively from the symbol immediately following the first PUSCH repetition. If one PUSCH repetition crosses a slot boundary, the terminal does not transmit the PUSCH repetition. Furthermore, if one PUSCH repetition overlaps with a symbol or SS / PBCH block set as DL in the semi-static UL-DL configuration, the terminal does not transmit the PUSCH repetition. In FIG. 20, the third PUSCH repetition overlaps with a slot boundary, so it is not transmitted.

[0219] FIG. 21 is a diagram illustrating 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, a base station transmits time domain resource allocation information (S: starting symbol index, L: length) for the first PUSCH repetition of a PUSCH to a terminal. Then, the base station transmits the number of repetitions K. The terminal determines a symbol for transmitting the PUSCH repetition based on the received information. Here, the next PUSCH repetition is transmitted consecutively from the symbol immediately following the first PUSCH repetition. If a symbol allocated to one PUSCH repetition crosses a slot boundary, the terminal may divide the symbol allocated to the PUSCH repetition based on the slot boundary and include the divided symbols in adjacent PUSCH repetitions of the same slot. If there is no adjacent PUSCH repetition in the same slot, the terminal may transmit the PUSCH repetition with the symbol. In FIG. 21, a symbol allocated to the third PUSCH repetition crosses a slot boundary. The slot boundaries may be separated by two symbols, with the first two symbols being included in the previous PUSCH repetition and the last two symbols being included in the subsequent PUSCH repetition.

[0220] FIG. 22 is a diagram for explaining an embodiment of transmitting information on symbols that cannot transmit PUSCH repeats. Referring to FIG. 22, the base station can further transmit information on symbols that cannot transmit PUSCH repeats to the terminal. The terminal transmits PUSCH repeats using the above-mentioned first to fourth transmission methods, and when a symbol that cannot transmit PUSCH repeats designated by the information transmitted from the base station overlaps with a symbol to which the PUSCH repeat is assigned, the terminal can exclude the symbol from the PUSCH repeat. Alternatively, when the symbol that cannot transmit PUSCH repeats overlaps with a symbol to which the PUSCH repeat is assigned, the terminal does not need to transmit the PUSCH repeat. Information on symbols that cannot transmit PUSCH repeats may be configured to the terminal through an RRC signal. Also, symbols that cannot transmit PUSCH repeats are configured to the terminal through an RRC signal, and DCI can indicate which symbol is actually a symbol that cannot transmit PUSCH repeats among the configured symbols that cannot transmit PUSCH repeats. In addition, when the base station configures a time domain resource assignment (TDRA) table for the terminal, the symbol for which the PUSCH repetition cannot be transmitted can be configured differently for each table entry. The terminal is indicated by DCI one entry of the configured TDRA table, and the terminal can transmit the PUSCH repetition based on the symbol for which the PUSCH repetition cannot be transmitted, configured 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 a PUSCH repetition. According to TS38.214, the size of the TB may be proportional to the number of REs of the resource to which the PUSCH is assigned. That is, a PUSCH to which more REs are assigned may have a larger TB size. However, as mentioned in the previous embodiment of PUSCH repetition, the number of REs that each PUSCH repetition may occupy may be different. For example, the first PUSCH repetition may occupy 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 basis for determining the size of the TB.

[0222] According to an embodiment of the present invention, the size of the TB may be determined so that the first PUSCH can be decoded. The reason for using PUSCH repetition is to reduce delay time by successful fast decoding. Therefore, it is important that the first PUSCH is transmitted in a decodable manner. For this purpose, the terminal may determine the size of the TB according to the number of REs of the first PUSCH. In general, the terminal may determine the size of the TB based on the minimum value of REs corresponding to PUSCH repetitions with a redundancy version (RV) value of 0. However, when 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 size of the TB 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 greater 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 number of REs occupied by the second PUSCH is smaller, so that the code rate increases and performance degradation may occur.

[0223] To solve this problem, according to one embodiment of the present invention, if the number of REs for the first PUSCH repetition is smaller than the average number of REs for all repetitions (i.e., the number of REs for all PUSCH repetitions divided by the number of repetitions), the TB size is determined by the number of REs for the first PUSCH repetition, otherwise the TB size can be determined by the average number of REs for all repetitions. To solve this problem, according to one embodiment of the present invention, if the TB size based on the number of REs for the first PUSCH repetition is smaller than the average TB size based on the number of REs for all repetitions (i.e., the sum of the TB sizes based on the number of REs for each PUSCH repetition divided by the number of repetitions), the TB size is determined by the number of REs for the first PUSCH repetition, otherwise the average TB size is determined.

[0224] PUSCH repeat transmission and UCI piggyback

[0225] Yet another exemplary problem that the present invention seeks to solve is that related to PUSCH repetitive transmission and UCI piggybacking (or UCI multiplexing).

[0226] FIG. 23 is a diagram for explaining PUSCH repetition transmission for PUSCH coverage extension and fast decoding. Referring to FIG. 23, when transmitting PUSCH, the terminal may repeatedly transmit PUSCH for PUSCH coverage extension and fast decoding. More specifically, the terminal may be configured or instructed from the base station to transmit the PUSCH repetition. When the terminal receives DCI scheduling the transmission of PUSCH, the DCI may indicate a time-frequency domain occupied by the first PUSCH repetition of the PUSCH to be repeatedly transmitted. The terminal may transmit PUSCH repetitions according to the number of repetitions after the first PUSCH repetition indicated in the DCI. Referring to FIG. 23(a), the terminal is configured and instructed to transmit PUSCH twice, and the terminal may transmit the first PUSCH repetition (PUSCH rep#0) according to the time-frequency resource allocation information indicated in the DCI. Then, the second PUSCH repetition (PUSCH rep#1) can be transmitted following the first PUSCH repetition (PUSCH rep#0). In each PUSCH repetition, a demodulation reference signal (DM-RS) 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. For convenience, the present invention will be described assuming that the DM-RS is configured to be located in the first symbol of the PUSCH repetition, but the concept of the present invention can be equally applied to the case where the DM-RS is configured to be located in another position.

[0227] Referring to FIG. 23(b), when the terminal repeatedly transmits the PUSCH, the terminal may omit the DM-RS in the PUSCH repetition and transmit the PUSCH repetition. Data to be transmitted on the uplink (i.e., UL-SCH) may be rate-matched and transmitted to the resource from which the DM-RS is omitted. When the DM-RS is omitted in this way, the base station can estimate the channel using the DM-RS of another PUSCH repetition and can receive the data to be transmitted on the uplink using the estimated value. By not transmitting the DM-RS, more resources can be used for data to be transmitted on the uplink (UL-SCH), and therefore the probability of successful transmission of the PUSCH can be increased.

[0228] In one embodiment of the present invention, when a terminal repeatedly transmits a PUSCH, whether or not the PUSCH repetition includes a DM-RS may be determined as follows.

[0229] As a first method, the base station may configure the terminal to include a period (number) of PUSCH repetitions including DM-RS. More specifically, the base station may configure the terminal to include DM-RS every X PUSCH repetitions. In this case, the first PUSCH repetition in each slot may always include DM-RS, and DM-RS may be included every X PUSCH repetitions 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. Then, the terminal may include DM-RS in the third PUSCH repetition and omit DM-RS 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. Then, the terminal may include DM-RS in the fourth PUSCH repetition and omit DM-RS in the fifth and sixth PUSCH repetitions. Figure 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, the first PUSCH repetition (PUSCH rep#0) and the second PUSCH repetition (PUSCH rep#1) include DM-RS. Then, by applying X=2 from the second PUSCH repetition, the third PUSCH repetition can omit DM-RS and the fourth PUSCH repetition can include DM-RS.

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

[0231] Figure 24 is a diagram illustrating multiplexing or piggybacking of a configuration in which a PUSCH repetition without DM-RS and another PUCCH are transmitted in the same symbol. With reference to Figure 24, the problem to be solved by the present invention relates to a method of multiplexing (or piggybacking) UCI ​​(Uplink control information) included in the PUCCH to a PUSCH when a UE is configured and instructed to transmit a PUSCH repetition without DM-RS and another PUCCH in the same symbol. With reference to 3GPP TS38.213 standard document, when a UE is configured and instructed to transmit a PUSCH and a PUCCH in the same symbol, the UCI included in the PUCCH may be multiplexed (or piggybacked) to a PUSCH, and in this case, the time-frequency resource to which the UCI is mapped may be located in the symbol immediately after the DMRS of the PUSCH. Since the UCI is arranged in the symbol immediately after the DM-RS, the reliability of the UCI (i.e., the probability of successfully transmitting the UCI) can be increased. In addition, when one PUCCH overlaps two or more PUSCHs, the terminal may multiplex (or piggyback) the UCI included in the PUCCH to 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 defined in which time-frequency resource the terminal should transmit the UCI included in the PUCCH. The present invention provides a method for determining a symbol in which the multiplexed (or piggybacked) UCI ​​is transmitted.

[0232] FIG. 25 is a diagram for explaining UCI transmission in a configuration in which a PUSCH repetition with DM-RS omitted and another PUCCH are transmitted in the same symbol. As an embodiment of the present invention, referring to FIG. 25, when a terminal is configured and instructed to transmit a PUSCH repetition with DM-RS omitted and another PUCCH in the same symbol, UCI included in the PUCH can be transmitted from a predetermined symbol of the PUSCH repetition with DM-RS omitted. Here, preferably, the position of the predetermined symbol may be the first symbol of the PUSCH repetition. Here, preferably, the position of the predetermined symbol may be the last symbol of the PUSCH repetition. In FIG. 25, the symbol to which 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 an omitted DM-RS in a configuration in which a PUSCH repetition with an omitted DM-RS and another PUCCH are transmitted in the same symbol. As another embodiment of the present invention, referring to FIG. 26, when a terminal is configured and instructed to transmit a PUSCH repetition with an omitted DM-RS and another PUCCH in the same symbol, the terminal may map and transmit UCI in a symbol immediately after the DM-RS assuming that the DM-RS is present in the PUSCH repetition, even though the DM-RS is omitted and does not exist. This has an advantage that UCI mapping can be maintained the same between a PUSCH repetition with an DM-RS and a PUSCH repetition without an DM-RS. FIG. 26 shows that UCI may be transmitted in a symbol immediately after the symbol that the DM-RS should occupy if the DM-RS is transmitted in the second PUSCH repetition (PUSCH rep#1).

[0234] FIG. 27 is a diagram illustrating UCI multiplexing for adjacent PUSCH repetitions transmitting DM-RS in a configuration in which a PUSCH repetition without DM-RS 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 to transmit a PUSCH repetition without DM-RS and another PUCCH in the same symbol, the terminal may multiplex (or piggyback) UCI ​​in a PUSCH repetition transmitting DM-RS among adjacent PUSCH repetitions and transmit the same. Here, the PUSCH repetition transmitting the DM-RS may be a PUSCH repetition that does not overlap with the same symbol as the PUCCH. The UCI may be mapped to a symbol immediately after the DM-RS symbol of the PUSCH repetition transmitting the DM-RS and transmitted. As an embodiment of the present invention, the PUSCH repetition transmitting DM-RS among adjacent PUSCH repetitions may be determined to be any one of the following: As a first method, the PUSCH repetition including the closest DM-RS is used among the PUSCH repetitions before the PUSCH repetition in which the overlapping DM-RS is omitted. As a second method, the PUSCH repetition including the closest DM-RS is used among the PUSCH repetitions after the PUSCH repetition in which the overlapping DM-RS is omitted. As a third method, the PUSCH repetition including the closest DM-RS to the overlapping PUCCH is used. Figure 27 shows that UCI is transmitted in the first PUSCH repetition (PUSCH rep#0) according to the first method. Figure 28 shows that UCI is transmitted in the third PUSCH repetition (PUSCH rep#2) according to the third method.

[0235] As another embodiment of the present invention, referring to FIG. 27, when the terminal is configured and instructed to transmit a PUSCH repetition without DM-RS and another PUCCH in the same symbol, the terminal may transmit a PUCCH without transmitting (dropping) the PUSCH repetition. However, when the terminal is configured and instructed to transmit a PUSCH repetition including DM-RS and another PUCCH in the same symbol, the UCI of the PUCCH may be multiplexed (or piggybacked) on the PUSCH repetition and transmitted.

[0236] Figure 29 is a diagram illustrating the omission of UCI information multiplexing in a configuration in which a PUSCH repetition without DM-RS and another PUCCH are transmitted in the same symbol. As another embodiment of the present invention, referring to Figure 29, when a terminal is configured and instructed to transmit a PUSCH repetition without DM-RS and another PUCCH in the same symbol, if UCI included in the PUCCH is transmitted in at least one PUSCH repetition, the PUSCH repetition without DM-RS may not multiplex or piggyback and transmit UCI information. Figure 29 shows a case in which a second PUSCH repetition (PUSCH rep#1), a third PUSCH repetition (PUSCH rep#2), a fourth PUSCH repetition (PUSCH rep#3) and PUCCH are configured and instructed to be transmitted in the same symbol. Here, DM-RS is omitted in the second PUSCH repetition and the fourth PUSCH repetition, and DM-RS is included in the first PUSCH repetition and the third PUSCH repetition. Since the DM-RS is present in the third PUSCH repetition, UCI information is multiplexed (or piggybacked) in the PUSCH repetition and transmitted. Therefore, the UCI information does not need to be multiplexed (or piggybacked) in the second and fourth PUSCH repetitions in which the DM-RS is omitted.

[0237] Yet another exemplary problem to be solved by the present invention is a method for multiplexing (or piggybacking) UCI ​​in a situation where multiple PUSCH repetitions overlap one PUCCH symbol. For example, when four 2-symbol PUSCH repetitions (first PUSCH repetition, second PUSCH repetition, third PUSCH repetition, and fourth PUSCH repetition) overlap one PUCCH symbol, the UE must piggyback UCI to the four PUSCH repetitions. In this case, the same UCI information is repeatedly transmitted in four PUSCH repetitions, which not only increases the resources used for UCI transmission, but also leads to a shortage of resources to be used for uplink data (i.e., UL-SCH) for UCI transmission, which may lead to uplink data transmission failure. The present invention provides 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 symbols, the terminal may multiplex (or piggyback) UCI ​​information in only one PUSCH repetition and transmit the UCI information in the remaining PUSCH repetitions. Preferably, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions. Alternatively, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions overlapping with the PUCCH. Alternatively, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions. Alternatively, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions overlapping with the PUCCH. Alternatively, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions that satisfy a PUCCH processing time. Alternatively, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions in a slot in which the PUCCH is transmitted. Alternatively, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions in a slot in which the PUCCH is transmitted. Alternatively, the one PUSCH repetition may be the last PUSCH repetition among the PUSCH repetitions that overlap with the PUCCH. Alternatively, the one PUSCH repetition may be the first PUSCH repetition among the PUSCH repetitions that fill the PUCCH processing time in a 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 UCI information is multiplexed (or piggybacked) and transmitted on a plurality of PUSCH repetitions, the UE may transmit the UCI information separately on each PUSCH repetition, instead of transmitting all UCI information on each PUSCH repetition. For example, when UCI information is given as N bits and UCI information is multiplexed (or piggybacked) and transmitted on two PUSCH repetitions, the UE may transmit half (N / 2 bits, or ceil(N / 2) bits, or floor(N / 2) bits) of the N-bit UCI information on one PUSCH repetition and transmit the remaining half (N / 2 bits, or floor(N / 2) bits, or ceil(N / 2) bits) on the remaining PUSCH repetition. In general, when UCI information is multiplexed (or piggybacked) and transmitted with K PUSCH repetitions, ceil(N / K) bits can be transmitted with K1=mod(N,K) PUSCH repetitions, or floor(N / K) bits can be transmitted with K2=K-K1 PUSCH repetitions. Here, different types of UCI information may be separated in the above process. That is, HARQ-ACK information, CSI part 1, and CSI part 2 may be divided and mapped to PUSCH repetitions for transmission.

[0240] Yet another exemplary problem to be solved by the present invention relates to a method for transmitting UCI included in a PUSCH when a symbol of a PUSCH configured with intra-slot hopping overlaps with a PUCCH during transmission. Referring to the 3GPP TS38.213 standard document, UCI can be divided into two hops (first hop and second hop) of a PUSCH configured with inter-slot hopping, multiplexed (or piggybacked) and transmitted. 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 a PUCCH overlaps with a PUSCH with at least one symbol, UCI can be transmitted in two hops. By transmitting UCI in two hops in this manner, UCI can also obtain frequency diversity gain, and thus the probability of successful reception can be increased. However, referring to Figure 30, since UCI is transmitted to two hops, compared to transmitting only PUCCH alone, all UCI can be received only after receiving UCI transmitted at the second hop. Therefore, a delay may occur in receiving UCI. The present invention provides a method for solving this problem.

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

[0242] Although the method and system of the present invention has been described in conjunction with a particular embodiment, some or all of its components or operations may be implemented using a computer system having a general-purpose hardware architecture.

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

[0244] The scope of the present invention is defined by the claims set forth below rather than the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be interpreted as being included within the scope of the present invention. [Explanation of symbols]

[0245] 100 devices 110 Processor 120 Communication Module 121 Cellular communication interface card 122 Cellular communication interface card 123 Unlicensed spectrum communication interface card 130 Memory 140 User Interface 150 display units 200 base stations 210 Processor 220 Communication Module 221 Cellular communication interface card 222 Cellular communication interface card 223 Unlicensed spectrum communication interface card 230 Memory

Claims

1. A method for a terminal to transmit a physical uplink shared channel (PUSCH) to a base station in a wireless communication system, comprising: receiving a radio resource control (RRC) signal from the base station, the 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 for transmitting a PUSCH repetition is a case in which the transmission of the PUSCH repetition is not possible; and transmitting the PUSCH repetition to the base station based on a determination as to whether transmission of the PUSCH repetition is not possible; When the transmission of the PUSCH repetition is not possible, at least one of the symbols is designated as a semi-static downlink symbol by the configuration information.

2. The step of transmitting the PUSCH repetition comprises: The method of claim 1 , further comprising transmitting the PUSCH repetition excluding at least one symbol on which the PUSCH repetition cannot be transmitted among a number of symbols required for transmitting the PUSCH repetition.

3. The method of claim 1 , further comprising the step of: when the PUSCH repetition cannot be transmitted, at least one of the symbols is located before a slot boundary and at least one of the symbols is located after a slot boundary.

4. The method of claim 1 , wherein the step of transmitting the PUSCH repetition comprises transmitting the PUSCH repetition in an earliest symbol in which the PUSCH repetition can be transmitted.

5. If the PUSCH repetition cannot be transmitted, The method of claim 1 , further comprising: at least one of the symbols being a threshold number or less of flexible symbols following a semi-static downlink symbol.

6. If the PUSCH repetition cannot be transmitted, 10. The method of claim 1, further comprising: at least one of the symbols being included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

7. If the PUSCH repetition cannot be transmitted, The method of claim 1, further comprising the step of: at least one of the symbols being a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource followed by a threshold number or less of flexible symbols.

8. The method further includes receiving information regarding at least one symbol on which the PUSCH repetition cannot be transmitted from the base station through an RRC signal; The method of claim 1, further comprising the step of: when the transmission of the PUSCH repetition is not possible, the step of indicating that the transmission of the PUSCH repetition is not possible according to information on the at least one symbol from the PDCCH.

9. The step of transmitting the PUSCH repetition comprises:

2. The method of claim 1, wherein a PUSCH having the same HARQ process number (HPN) as a PUSCH that includes the PUSCH repetition is suspended in response to being scheduled.

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

11. A terminal that transmits a physical uplink shared channel (PUSCH) to a base station in a wireless communication system, a communications module configured to receive a radio resource control (RRC) signal from the base station, the RRC signal including configuration information regarding semi-static uplink symbols, flexible symbols, and downlink symbols, receive a physical downlink control channel (PDCCH) from the base station, the PUSCH transmission including at least one PUSCH repetition, or transmit a PUSCH repetition to the base station; A memory configured to store control programs and data used by the terminal; and A processor configured to determine whether at least one of a number of symbols required for transmission of the PUSCH repetition is a case in which transmission of the PUSCH repetition is not possible, and to control transmission of the PUSCH repetition based on a determination of whether transmission of the PUSCH repetition is not possible, When the PUSCH repetition cannot be transmitted, the terminal includes a case where at least one of the symbols is designated as a semi-static downlink symbol by the configuration information.

12. The processor, The terminal of claim 11, further comprising: a terminal configured to control transmission of the PUSCH repetition such that the PUSCH repetition is transmitted excluding at least one symbol on which the PUSCH repetition cannot be transmitted among a number of symbols required for transmitting the PUSCH repetition.

13. The terminal of claim 11, wherein the case where the PUSCH repetition cannot be transmitted further includes a case where at least one of the symbols is located before a slot boundary and at least one of the symbols is located after a slot boundary.

14. The processor, The terminal of claim 11, further comprising: a terminal configured to control transmission of the PUSCH repetition such that the PUSCH repetition is transmitted in an earliest symbol in which the PUSCH repetition can be transmitted.

15. The terminal of claim 11, further comprising a case where, when the transmission of the PUSCH repetition is not possible, at least one of the symbols is a threshold number or less of flexible symbols following a semi-static downlink symbol.

16. The terminal of claim 11, further comprising: when the PUSCH repetition cannot be transmitted, at least one of the symbols is included in a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource.

17. 12. The terminal of claim 11, further comprising a case where at least one of the symbols is a synchronization signal (SS) / physical broadcast channel (PBCH) block transmission resource followed by a threshold number or less of flexible symbols when the PUSCH repetition cannot be transmitted.

18. The communication module is further configured to receive, from the base station, information regarding at least one symbol on which the PUSCH repetition cannot be transmitted in an RRC signal; The terminal of claim 11, wherein the case where the transmission of the PUSCH repetition is not possible further includes a case where the transmission of the PUSCH repetition is indicated as not possible by information on the at least one symbol from the PDCCH.

19. The processor, The terminal of claim 11, further comprising: a PUSCH having a same HARQ process number (HPN) as a PUSCH including the PUSCH repetition, the PUSCH repetition being scheduled, the PUSCH repetition being controlled to suspend transmission of the PUSCH repetition.

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

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