Method and apparatus for transmitting uplink channel in wireless communication system

Abstract

To provide a method and an apparatus for transmitting an uplink channel in a wireless communication system.SOLUTION: In a wireless communication system, a method for transmitting an uplink channel is a method performed by a terminal and includes step S7510 of receiving first information, which is information related to a TDD (Time Division Duplex) configuration, from a base station, and step S7520 of repeatedly transmitting the uplink channel to the base station on resources determined based on the first information.SELECTED DRAWING: Figure 75

Description

[Technical field]

[0001] The present disclosure relates to a wireless communication system, and to a method and apparatus for transmitting an uplink channel. [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] It increases efficiency and allows communication providers to provide more data and voice services over a given bandwidth. Therefore, the 3GPP (registered trademark, as below) 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 duplexing (FDD) and time division duplexing (TDD), and low operating costs with an enhanced end-user environment and simple architecture. For more efficient data processing, the dynamic TDD of the NR system may use a method to change the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and downlink according to the data traffic direction of the cell user. For example, when the downlink traffic of a cell is larger than the uplink traffic, the base station may allocate more downlink OFDM symbols to a slot (or subframe). Information about the slot configuration should be transmitted to the terminal.

[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] The present specification aims to provide a method and an apparatus for transmitting an uplink channel in a wireless communication system. [Means for solving the problem]

[0009] The present specification provides a method and apparatus for transmitting an uplink channel in a wireless communication system.

[0010] A method for transmitting an uplink channel in a wireless communication system, the method being performed by a terminal, is a method for transmitting an uplink channel in a wireless communication system, the method being performed by a terminal receiving a time division multiplexing (TDD) signal from a base station. receiving first information related to a slot duplex configuration, the first information including information related to a slot duplex configuration, the symbol type being one of a downlink symbol set to be available for downlink transmission, an uplink symbol set to be available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol; repeatedly transmitting an uplink channel to the base station on a resource determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, the first hop and the second hop being each configured by bundling a previously set number of slots used for transmitting the uplink channel, the slot being configured to include the uplink symbol, the first hop and the second hop being each configured as consecutive slots in a time domain, and the first hop and the second hop being each transmitted on different PRBs (Physical Resource Blocks) by frequency hopping.

[0011] In the present specification, the method further includes receiving information about the time domain interval from the base station, and the time domain interval is configured based on the information about the time domain interval.

[0012] A terminal for transmitting an uplink channel in a wireless communication system, the terminal including a transceiver and a processor for controlling the transceiver, the processor receiving a TDD (Time Division Duplex) signal from a base station. and receiving first information related to a (non-repeatable) duplex configuration, the first information including information related to a type of symbols constituting a slot, the type of the symbols being one of a downlink symbol set to be available for downlink transmission, an uplink symbol set to be available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol, and repeatedly transmitting an uplink channel to the base station on a resource determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, the first hop and the second hop being each configured by bundling a previously set number of slots used for transmitting the uplink channel, the slot being configured to include the uplink symbol, the first hop and the second hop being each configured by consecutive slots in a time domain, and the first hop and the second hop being each transmitted on different PRBs (Physical Resource Blocks) by frequency hopping.

[0013] Also, in this specification, the processor receives information relating to the time domain interval from the base station, and the time domain interval is configured based on the information relating to the time domain interval.

[0014] In the present specification, the preset number is received from the base station.

[0015] Also, in this specification, the slots included in the first hop are indexed with the same index, and the slots included in the second hop are indexed with the same index.

[0016] In addition, in this specification, when the number of consecutive slots used for transmitting the uplink channel is less than the already set number, the first hop or the second hop is characterized in that it is composed of a number of consecutive slots less than the already set number.

[0017] In this specification, the slot used for transmitting the uplink channel includes the uplink symbol and the flexible symbol.

[0018] In addition, in this specification, the first hop is composed of a first slot and a second slot, the first slot includes a first DM-RS (Demodulation Reference Signal), the second slot includes a second DM-RS, the first DM-RS and the second DM-RS are transmitted on resources of the same PRB number starting from PRB positions in the same frequency domain, and are transmitted using the same phase, the same transmission power, the same QCL (Quasi Co Location), and the same beamforming, and the second hop is composed of a third slot and a fourth slot, the third slot includes a third DM-RS, the fourth slot includes a fourth DM-RS, and the third DM-RS and the fourth DM-RS are transmitted on resources of the same PRB number starting from PRB positions in the same frequency domain, and are transmitted using the same phase, the same transmission power, the same QCL (Quasi Co Location), and the same beamforming.

[0019] Furthermore, in this specification, there is at least one downlink symbol or flexible symbol between the last symbol to which the repeatedly transmitted uplink channel in the first slot is mapped and the first symbol to which the repeatedly transmitted uplink channel in the second slot is mapped, and there is at least one downlink symbol or flexible symbol between the last symbol to which the repeatedly transmitted uplink channel in the third slot is mapped and the first symbol to which the repeatedly transmitted uplink channel in the fourth slot is mapped.

[0020] In this specification, the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

[0021] In this specification, the uplink channel is characterized in that it is transmitted within a time domain interval.

[0022] In the present specification, the information regarding the time domain duration includes any one of a number of slots, a number of symbols, and a number of repeated transmissions of the uplink channel.

[0023] In the present specification, the time domain section is characterized by being from a point in time when the repeated transmission of the uplink channel starts to a point in time when the repeated transmission of the uplink channel ends.

[0024] In the present specification, the time domain section is characterized by being composed of consecutive slots in the time domain including at least one of the uplink symbol and the flexible symbol.

[0025] In addition, in this specification, the time domain section includes a first time domain section and a second time domain section, the first time domain section is configured to correspond to a first pattern, the second time domain section is configured to correspond to a second pattern, the first pattern and the second pattern are configured of a plurality of slots, and the slot configurations constituting the first pattern and the second pattern are different from each other.

[0026] Also, in this specification, the DM-RS included in each of the multiple slots constituting the first pattern is transmitted on resources with the same number of PRBs starting from PRB positions in the same frequency domain, and is transmitted using the same phase, the same transmission power, the same QCL (Quasi Co Location), and the same beamforming, and the DM-RS included in each of the multiple slots constituting the second pattern is transmitted on resources with the same number of PRBs starting from PRB positions in the same frequency domain, and is transmitted using the same phase, the same transmission power, the same QCL (Quasi Co Location), and the same beamforming.

[0027] A method for receiving an uplink channel in a wireless communication system, the method being performed by a base station, includes the steps of: transmitting, to a terminal, first information, which is information related to a Time Division Duplex (TDD) configuration, the first information including information regarding a type of a symbol constituting a slot, the type of the symbol being one of a downlink symbol set to be available for downlink transmission, an uplink symbol set to be available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol; receiving, from the terminal, an uplink channel repeatedly transmitted on a resource determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, the first hop and the second hop being respectively configured by bundling a slot used for transmitting a previously set number of uplink channels, the slot used for transmitting the uplink channel being configured to include the uplink symbol, the first hop and the second hop being respectively configured by consecutive slots in a time domain, the first hop and the second hop being respectively configured by bundling a slot used for transmitting the uplink channel, the slot including the uplink symbol ... The present invention is characterized in that it includes the steps of: transmitting the signal on a single block; Effect of the Invention

[0028] This document is directed to transmitting the uplink channel using frequency hopping.

[0029] An object of the present specification is to provide a method for transmitting DMRSs, which are combined with each other and used for channel estimation, on an uplink channel.

[0030] An object of the present specification is to provide a method for determining a time domain interval in which DMRSs used for channel estimation in combination with each other are transmitted.

[0031] The effects obtained from this specification are not limited to the effects 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]

[0032] [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] FIG. 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] 4 illustrates a method for scheduling a physical uplink shared channel in the time domain according to an embodiment of the present invention. [Figure 13] 1 illustrates a method for scheduling a physical uplink shared channel in the frequency domain according to an embodiment of the present invention. [Figure 14] 1 illustrates repeated transmission of a physical uplink shared channel according to one embodiment of the present invention. [Figure 15] 1 illustrates a method for scheduling a physical uplink control channel according to one embodiment of the present invention. [Figure 16] 1 illustrates repeated transmission of a physical uplink control channel according to one embodiment of the present invention. [Figure 17] 1 illustrates a problem that occurs when a terminal repeatedly transmits a PUSCH in a TDD situation according to one embodiment of the present invention. [Figure 18] 1 illustrates a problem that occurs when a terminal repeatedly transmits a PUCCH in a TDD situation according to one embodiment of the present invention. [Figure 19] 1 illustrates a method for combining PUSCHs transmitted repeatedly according to an embodiment of the present invention. [Figure 20] 1 illustrates a method for combining PUSCHs transmitted repeatedly according to an embodiment of the present invention. [Figure 21] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Figure 22] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Diagram 23] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Figure 24] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Diagram 25] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Figure 26] 1 illustrates a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Figure 27] 13 illustrates a method for determining a position of a symbol to which a DMRS included in a PUSCH that is repeatedly transmitted is mapped according to an embodiment of the present invention. [Figure 28] 1 illustrates a method for repeatedly transmitting a PUCCH according to one embodiment of the present invention. [Figure 29] 1 illustrates a method for repeatedly transmitting a PUCCH according to one embodiment of the present invention. [Diagram 30] 1 illustrates a method for repeatedly transmitting a PUCCH according to one embodiment of the present invention. [Diagram 31] 1 illustrates a method for repeatedly transmitting a PUSCH according to one embodiment of the present invention. [Diagram 32] 1 illustrates a method for repeatedly transmitting a PUSCH according to one embodiment of the present invention. [Diagram 33] 1 illustrates a method for configuring resources for transmitting a PUCCH according to one embodiment of the present invention. [Diagram 34] 1 shows that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on the same symbol. [Diagram 35] 1 illustrates that each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention is transmitted on different symbols. [Diagram 36] 1 illustrates that each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention is transmitted on different symbols. [Figure 37] 1 illustrates that each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention is transmitted on different symbols. [Figure 38] 1 illustrates a case where the same number of PRBs are set for each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention. [Figure 39] 13 shows a PRB for transmitting a DMRS configured for each PUCCH that is repeatedly transmitted according to one embodiment of the present invention. [Diagram 40] 13 shows a PRB for transmitting a DMRS configured for each PUCCH that is repeatedly transmitted according to one embodiment of the present invention. [Diagram 41] 1 illustrates a PUSCH that is repeatedly transmitted according to one embodiment of the present invention. [Diagram 42] 1 illustrates a method for multiplexing a PUSCH that is repeatedly transmitted and UCI included in the PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Diagram 43] 1 illustrates a method for multiplexing a PUSCH that is repeatedly transmitted and UCI included in the PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Diagram 44] 13 illustrates transmission cancellation of a PUSCH that is repeatedly transmitted based on a PUCCH that is repeatedly transmitted according to an embodiment of the present invention. [Diagram 45] 1 illustrates a PUCCH that is repeatedly transmitted according to one embodiment of the present invention. [Diagram 46] 1 illustrates a PUCCH that is repeatedly transmitted and intra-slot frequency hopping according to one embodiment of the present invention. [Figure 47] 1 illustrates a PUCCH transmitted repeatedly and inter-slot frequency hopping according to one embodiment of the present invention. [Figure 48] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 49] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 50] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 51] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 52] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 53] 13 illustrates a method for determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to one embodiment of the present invention. [Figure 54] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 55] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 56] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 57] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 58] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 59] 4 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 60] 1 illustrates scheduling of one physical uplink shared channel according to one embodiment of the present invention. [Figure 61] 1 illustrates scheduling of multiple physical uplink shared channels according to one embodiment of the present invention. [Figure 62] 3 illustrates a method for determining a time domain window according to one embodiment of the present invention. [Figure 63] 4 illustrates a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 64] 4 illustrates a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 65] 4 illustrates a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 66] 4 illustrates a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 67] 4 illustrates a method for determining a time domain window in a carrier aggregation context according to one embodiment of the present invention. [Figure 68]4 illustrates a method for determining a time domain window in a carrier aggregation context according to one embodiment of the present invention. [Figure 69] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 70] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 71] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 72] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 73] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 74] 4 illustrates a method for setting a time domain interval according to one embodiment of the present invention. [Figure 75] 4 is a flowchart illustrating a method for transmitting an uplink channel according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] When information about the symbol type is configured using UE-specific RRC signals, the base station may signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of DL symbols among the N symbols of the corresponding slot for each slot, and the number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, the symbol that is not configured using either the UL symbol or the DL symbol is the flexible symbol. slot symb 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 slot symb The symbol type composed of the RRC signals as described above is called a semi-static DL / UL configuration. In the semi-static DL / UL configuration composed of the RRC signals described above, the flexible symbol is indicated as a downlink symbol, an uplink symbol, or a flexible symbol via the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, the downlink symbol or the uplink symbol composed of the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI indicated by the base station to the terminal.

[0047] The symbol type composed of the RRC signals as described above is called a semi-static DL / UL configuration. In the semi-static DL / UL configuration composed of the RRC signals described above, the flexible symbol is indicated as a downlink symbol, an uplink symbol, or a flexible symbol via the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, the downlink symbol or the uplink symbol composed of the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI indicated by the base station to the terminal.

[0048]

Table 1

[0049] In Table 1, D indicates a downlink symbol, U indicates an uplink symbol, and X indicates a flexible symbol. As shown in Table 1, up to two DL / UL switchings are allowed in one slot.

[0050] FIG. 3 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channels.

[0051] When the UE is powered on or camps on a new cell, the UE performs an initial cell search (S101). Specifically, the UE may synchronize to a BS during the initial cell search. For this, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from a base station to synchronize to the base station and obtain information such as a cell ID. After that, the UE may receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0052] 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.

[0053] 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).

[0054] 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.

[0055] 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.

[0056] 4a and 4b show SS / PBCH blocks for initial cell access in a 3GPP NR system.

[0057] 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).

[0058] 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 2, 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.

[0059] [Table 2]

[0060] 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:

[0061]

number

[0062] Where:

number

number

[0063] Furthermore, the SSS series d SSS (n) is as follows:

[0064]

number

[0065] Where:

number

number

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] FIG. 7 illustrates a method for configuring a PUCCH search space in a 3GPP NR system.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] Table 3 illustrates one embodiment of a physical uplink control channel (PUCCH) for use in a wireless communication system.

[0076] [Table 3]

[0077] The PUCCH may be used to transmit the following UL control information (UCI):

[0078] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0079] - 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.

[0080] -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 divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0081] In the 3GPP NR system, five PUCCH formats may be used to support different service scenarios, different channel environments, and frame structures.

[0082] 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 PRB 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. ...

[0083] 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.

[0084] 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.

[0085] 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 and 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] FIG. 8 is a conceptual diagram illustrating carrier aggregation.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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).

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] FIG. 11 is a block diagram illustrating a configuration of a terminal and a base station according to an embodiment of the present disclosure.

[0105] In the embodiment of the present disclosure, the terminal may be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal may also be called User Equipment (UE), Station (STA), Mobile Subscriber (MS), etc. In addition, in the 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.

[0106] 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 .

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or a 5 GHz band that is equal to or greater than 52.6 GHz. The at least one NIC module of the unlicensed band communication interface card 123 may wirelessly communicate 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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 .

[0116] 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.

[0117] 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 220 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.

[0118] 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.

[0119] 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.

[0120] 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 5 GHz band of 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or 52.6 GHz or higher. 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.

[0121] The terminal 100 and base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present invention, and the separately shown blocks are used to logically distinguish between elements of the devices. Therefore, the above-mentioned device elements may be implemented as a single chip or multiple chips depending on the device design. Also, 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. Also, the user interface 140 and the display unit 150 may be further provided in the base station 200 as necessary.

[0122] FIG. 12 illustrates a method for scheduling a physical uplink shared channel in the time domain according to an embodiment of the present invention.

[0123] The terminal can transmit uplink data to the base station through the PUSCH. The base station can schedule the terminal to transmit uplink data through the PUSCH (PUSCH scheduling). i) In a dynamic grant (DG) method, the base station can perform PUSCH scheduling using DCI included in the PDCCH. Or, ii) in a configured grant (CG) method, the terminal can transmit uplink data to the base station through the PUSCH according to resources and a transmission method that the base station presets in the terminal.

[0124] At this time, the DCI included in the PDCCH may include PUSCH scheduling information. For example, the DCI may include information on the time domain (time-domain resource assignment, TDRA) and information on the frequency domain (frequency-domain resource assignment, FDRA). The terminal may receive the DCI transmitted in the control resource set and the search space, and perform an operation indicated by the DCI (e.g., uplink data transmission using the PUSCH). At this time, the format of the DCI for PUSCH scheduling may be DCI format 0_0, 0_1, or 0_2. The DCI of the DCI formats 0_0, 0_1, or 0_2 may be configured to include a TDRA field including time domain information of the PUSCH. At this time, the time domain information may include K2, which is an offset value between a slot in which the base station transmits the PDCCH and a slot in which the terminal transmits the PUSCH. In addition, the DCI may include a start and length indication value (SLIV), which is a value obtained by jointly coding the start symbol index (S) of the PUSCH and the symbol length (L, number) of the PUSCH in the slot indicated by K2. When the terminal receives DCI in slot n, the slot in which PUSCH is scheduled is floor(n*2 μPUSCH / n*2 μPDCCH )+K2 slots. μPUSCH and μPDCCH may respectively refer to the subcarrier spacing (SCS) of a cell in which a PUSCH is scheduled and a cell in which a UE receives a PDCCH. floor(x) is a function that returns the maximum integer among integers equal to or smaller than x. In this specification, slot n may refer to a slot indexed with index n.

[0125] 12(a), the subcarrier spacing of the cell in which the terminal receives the PDCCH and the cell in which the PUSCH is scheduled may be the same. In this case, if the terminal receives the PDCCH in slot n and K2 is indicated as 4, the slot in which the PUSCH is scheduled may be slot n+K2, i.e., slot n+4.

[0126] There are two types of mapping types for scheduling PUSCH: PUSCH mapping type A and PUSCH mapping type B. The starting symbol index of PUSCH and the range of values ​​that can be SLIV may vary depending on the PUSCH mapping type. PUSCH mapping type A allows only resource allocation including a DMRS symbol, and the DMRS symbol may be located at the third or fourth symbol of a slot depending on a value specified by a higher layer. That is, in the case of PUSCH mapping type A, the index (S) of the starting symbol of PUSCH is 0, and the length (L) of PUSCH may have any one of values ​​from 4 to 14 (12 in extended CP) depending on the DMRS symbol position. In PUSCH mapping type B, the first symbol of PUSCH may be a DMRS symbol. Therefore, S may have any one of values ​​from 0 to 13 (11 in extended CP), and L may have any one of values ​​from 1 to 14 (12 in extended CP). Also, one PUSCH may not cross a slot boundary, and the sum of S and L should be less than or equal to 14 (12 for extended CP).

[0127] 12(b), the base station can schedule PUSCH mapping type A in which the third symbol is a DMRS symbol, the start symbol index (S) is 0, and the length (L) is 7, PUSCH mapping type B in which the fourth symbol is a DMRS symbol, the start symbol index (S) is 0, and the length (L) is 7, and PUSCH mapping type B in which the first symbol is a DMRS symbol, the start symbol index (S) is 5, and the length (L) is 5. In this case, the frequency domain information of the PUSCH indicated in the FDRA field of DCI formats 0_0, 0_1, and 0_2 is divided into two types according to the frequency resource allocation type.

[0128] FIG. 13 illustrates a method for scheduling a physical uplink shared channel in the frequency domain according to an embodiment of the present invention.

[0129] Hereinafter, frequency resource allocation types will be described with reference to FIG.

[0130] i) The first type, frequency resource allocation type 0 (type0), may be a type in which a certain number of PRBs are bundled according to the number of RBs included in the BWP configured in the terminal to configure an RBG, and an RBG is used or not using a bitmap for each RBG. That is, the terminal may determine whether a corresponding RBG is used or not using a bitmap transmitted from the base station. The number of PRBs included in one RBG may be configured from a higher layer, and the more RBs included in the BWP configured in the terminal, the more PRBs may be configured. Referring to FIG. 13(a), the BWP size configured in the terminal may be 72 PRBs, and one RBG may be configured with 4 PRBs. In this case, the terminal may determine that four PRBs are one RBG in ascending order starting from PRB0, and each RBG may be indexed from 0. That is, an RBG consisting of PRBs PRB0 to PRB3 may be indexed as RBG0, and an RBG consisting of PRBs PRB4 to PRB7 may be indexed as RBG1. In the same manner, up to RBG17 may be indexed, and in this case, the base station transmits a total of 18 bits, one bit (0 or 1) for each RBG to the terminal, and the terminal can determine whether the PRB constituting the corresponding RBG is used based on the received 18 bits. In this case, if the bit value is 0, the terminal can determine that the PUSCH is not scheduled in any PRB of the PRB constituting the corresponding RBG. If the bit value is 1, the terminal can determine that the PUSCH is scheduled in all PRBs in the corresponding RBG. In this case, the bit value may be applied inversely. ii) The second type, frequency resource allocation type 1, may be a type indicating information of consecutive PRBs allocated according to the size of the terminal's initial BWP or active BWP. The information of the consecutive PRBs may be a resource indication value (RIV) in which the start index (S) and length (L) of the consecutive PRBs are jointly coded.13(b), when the BWP size of the terminal is 50 PRBs and PUSCH is scheduled from PRB2 to PRB11 among the 50 PRBs, the start index and length of the consecutive PRBs may be 2 and 10, respectively. That is, the terminal may determine the start index and length of the consecutive PRBs for which PUSCH is scheduled based on the RIV value received from the base station. Specifically, the RIV is N. size BWP *(L-1)+S may be calculated. size BWP may be the size of the BWP set in the terminal. For example, if the RIV value received by the terminal is 452, it is calculated as 452=50*(10-1)+2, so that the terminal can determine that the start index of the consecutive PRBs for which the PUSCH is scheduled is 2 and the length is 10.

[0131] By using DCI of DCI formats 0_1 and 0_2 for scheduling PUSCH, the terminal may be configured by a higher layer to use only one of the above two types of frequency resource allocation types or to dynamically use the two types. When the terminal is configured to dynamically use the two types, the terminal can determine which type it is by using the most significant bit (MSB) of the FDRA field of the DCI.

[0132] There may be an uplink shared channel transmission method based on a configured grant for URLLC transmission, etc. The uplink shared channel transmission method based on the configured grant may be described as grant-free transmission. The uplink shared channel transmission method based on the configured grant may be a method in which if a base station configures resources available for uplink transmission to a terminal by a higher layer (i.e., RRC signaling), the terminal transmits an uplink shared channel using the configured resources. The uplink shared channel transmission method based on the configured grant may be classified into two types depending on whether the DCI indicates activation or release. i) Type 1: The uplink shared channel transmission method based on the configured grant may be a method in which a resource and a transmission method are configured in advance by a higher layer. ii) Type 2: The uplink shared channel transmission method based on the configured grant may be a method in which grant-based transmission configured by a higher layer is configured, and a resource and a method for actual transmission are configured by the DCI.

[0133] The uplink transmission method based on the configured grant can support URLLC transmission. Therefore, in order to ensure high reliability, uplink transmission may be repeated on multiple slots. In this case, the RV (redundancy version) sequence may be one of {0,0,0,0}, {0,2,3,1}, and {0,3,0,3}, and an RV corresponding to a mod(n-1,4)+1th value may be used in the n-th repeated transmission. That is, an RV corresponding to a value obtained by adding 1 to a remainder obtained by dividing n-1 by 4 may be used. In addition, a terminal configured to repeatedly transmit an uplink channel can start repeated transmission only in a slot in which the RV value corresponds to 0. However, if the RV sequence is {0,0,0,0} and the uplink channel is configured to be repeatedly transmitted in 8 slots, the terminal cannot start repeated transmission in the 8th slot. The terminal may terminate the repeated transmission when the number of repeated transmissions set by a higher layer is reached or the period is exceeded, or when a UL grant having the same HARQ process ID is received. The UL grant may refer to a DCI that schedules a PUSCH.

[0134] As described above, in order to improve the reliability of PUSCH transmission / reception between a base station and a terminal in a wireless communication system, the base station can configure the terminal to repeatedly transmit the PUSCH.

[0135] 14 shows repeated transmission of a physical uplink shared channel according to an embodiment of the present invention. In FIG. 14 to FIG. 27, actual#n means actual PUSCH or PUCCH of index n, and combined#n means combined PUSCH or PUCCH of index n.

[0136] There may be two types of PUSCH repeat transmission performed by the terminal. i) First, PUSCH repeat transmission type A will be described. When the terminal receives DCI of DCI format format 0_1, 0_2 included in the PDCCH that schedules the PUSCH from the base station, the terminal can repeatedly transmit the PUSCH on K consecutive slots. The K value may be set from a higher layer, or may be a value included in the TDRA field of the DCI and set in the terminal. For example, referring to FIG. 14(a), the terminal can receive the PDCCH that schedules the PUSCH in slot n, and the K2 value may be set from the DCI included in the received PDCCH. In this case, when the K2 value is 2 and the K value is 4, the terminal can start PUSCH repeat transmission in slot n+K2 and repeat PUSCH up to slot n+K2+K-1. That is, the terminal starts PUSCH repeat transmission in n+2 and repeats PUSCH up to n+5. In this case, the time and frequency resources in which the PUSCH is transmitted in each slot may be the same as those indicated by the DCI. That is, the PUSCH may be transmitted in the same symbol and PRB(s) in the slot. ii) Next, PUSCH repetitive transmission type B will be described. PUSCH repetitive transmission type B may be a type used for the terminal to repeatedly transmit a PUSCH with low latency to meet the requirements of URLLC, etc. The terminal may set the symbol (S) at which the repetitive transmission of the PUSCH starts and the length (L) of the PUSCH to be repeatedly transmitted in the TDRA field of the DCI transmitted by the base station. In this case, the start symbol (S) and the length (L) may be for a nominal PUSCH temporarily obtained, not for a PUSCH actually transmitted by the terminal. There may not be another symbol between the nominal PUSCHs set to be repeatedly transmitted. That is, the nominal PUSCHs may be consecutive in the time domain. The terminal can determine the actual PUSCH from the nominal PUSCH. One nominal PUSCH may be determined as one or more actual PUSCHs. The base station may configure unavailable symbols in PUSCH repetition transmission type B to the terminal.Symbols that are not available in PUSCH repetitive transmission type B may be described as invalid symbols. The terminal may exclude invalid symbols from resources configured to transmit the nominal PUSCH. As described above, the nominal PUSCH is configured to be repeatedly transmitted on consecutive symbols, but when invalid symbols are excluded, the resources for the nominal PUSCH transmission become discontinuous. The actual PUSCH may be configured to be transmitted on consecutive symbols configured for one nominal PUSCH transmission excluding the invalid symbols. In this case, if consecutive symbols cross a slot boundary, the actual PUSCH that is actually transmitted may be divided based on the slot boundary. The invalid symbols may include downlink symbols configured for the terminal by the base station. Referring to FIG. 14(b), the terminal may be scheduled to transmit a PUSCH with a length of 5 symbols from the 12th symbol of the first slot (slot n), and 4 type B repetitive transmissions may be configured. In this case, the resources scheduled for the first nominal PUSCH (nominal #1) may include symbols (n, 11), (n, 12), (n, 13), (n + 1, 0), and (n + 1, 1). The resources scheduled for the second nominal PUSCH (nominal #2) may include symbols (n + 1, 2), (n + 1, 3), (n + 1, 4), (n + 1, 5), and (n + 1, 6). The resources scheduled for the third nominal PUSCH (nominal #3) may include symbols (n + 1, 7), (n + 1, 8), (n + 1, 9), (n + 1, 10), and (n + 1, 11). The resources scheduled for the fourth nominal PUSCH (nominal#4) may include symbols (n+1,12), (n+1,13), (n+2,0), (n+2,1), and (n+2,2). Here, symbol (n,k) refers to symbol k in slot n. That is, k may range from 0 to 13 in the normal CP, and may range from 0 to 11 in the extended CP.The ineffective symbols may be set to symbols 6 and 7 of slot n+1. In this case, the last symbol of the second nominal PUSCH (nominal#2) may be excluded, and the first symbol of the third nominal PUSCH (nominal#3) may be excluded to determine the actual PUSCH. The first nominal PUSCH (nominal#1) may be divided into two actually transmitted actual PUSCHs (actual#1 and actual#2) by the slot boundary. The second nominal PUSCH (nominal#2) and the third nominal PUSCH (nominal#3) may be each combined into one actual PUSCH (actual#3 and actual#4) by combining consecutive symbols excluding the ineffective symbols. Finally, the fourth nominal PUSCH (nominal#4) is divided into two actually transmitted (actual) PUSCHs (actual#5 and actual#6) by the slot boundary. The terminal finally transmits the PUSCH that is actually transmitted (actual). One actual PUSCH must include at least one DMRS symbol. Therefore, when PUSCH repetition transmission type B is configured, if the total length of the actual PUSCH is one symbol, such an actual PUSCH may be omitted without being transmitted. This is because the actual PUSCH consisting of one symbol cannot include any other information besides DMRS.

[0137] To obtain diversity gain in the frequency domain, frequency hopping may be configured for uplink channel transmission.

[0138] In the PUSCH repetitive transmission type A, either intra-slot frequency hopping in which frequency hopping is performed within a slot or inter-slot frequency hopping in which frequency hopping is performed for each slot may be configured in the terminal. If intra-slot frequency hopping is configured in the terminal, the terminal divides the PUSCH into two in the time domain in the slot in which the PUSCH is transmitted, transmits one half with a scheduled PRB, and transmits the other half with a PRB obtained by adding an offset value to the scheduled PRB. In this case, the offset value may be configured to two or four values ​​according to an active BWP size in a higher layer, and one of the values ​​may be configured (instructed) in the terminal by DCI. If inter-slot frequency hopping is configured in the terminal, the terminal may transmit the PUSCH with a PRB scheduled in a slot with an even slot index, and transmit the PUSCH with a PRB obtained by adding an offset value to the scheduled PRB in an odd slot.

[0139] In the PUSCH repetition transmission type B, either inter-repetition frequency hopping in which frequency hopping is performed at a nominal PUSCH boundary or inter-slot frequency hopping in which frequency hopping is performed every slot may be configured in the terminal. When inter-repetition frequency hopping is configured in the terminal, the terminal transmits an actual PUSCH corresponding to an odd-numbered nominal PUSCH on a scheduled PRB, and the terminal can transmit an actual PUSCH corresponding to an even-numbered nominal PUSCH on a PRB obtained by adding an offset value to the scheduled PRB. In this case, the offset value may be configured to two or four values ​​according to an active BWP size in a higher layer, and any one of the values ​​may be configured (indicated) in the terminal by DCI. When inter-slot frequency hopping is configured in the terminal, the terminal can transmit a PUSCH on a PRB scheduled in a slot with an even slot index, and transmit a PUSCH on a PRB obtained by adding an offset value to the PRB scheduled in an odd slot.

[0140] When performing PUSCH repeated transmission, if a symbol scheduled for PUSCH transmission in a particular slot overlaps with a semi-statically configured DL symbol or a symbol set for receiving an SS / PBCH block, the terminal may not transmit the overlapping PUSCH on the slot including the overlapping symbol, and may postpone the overlapping PUSCH and not transmit it on the next slot.

[0141] When the terminal receives DCI of DCI format 1_0, 1_1, or 1_2 that schedules the PUCCH, the terminal must transmit the PUCCH to the base station. In this case, the PUCCH may include uplink control information (UCI), and the UCI may include at least one of HARQ-ACK, SR (Scheduling Request), and CSI (Channel State Information). The HARQ-ACK may be a HARQ-ACK for whether the terminal successfully receives two types of channels. The first type may be a HARQ-ACK for the PDSCH when the PDSCH is scheduled in the terminal with DCI of DCI format 1_0, 1_1, or 1_2. The second type may be a HARQ-ACK for the DCI when the DCI of DCI format 1_0, 1_1, or 1_2 is a DCI instructing the release of a semi-statically scheduled (Semi-Persistent Scheduling, SPS) PDSCH. For the transmission of a PUCCH including a HARQ-ACK, the "PDSCH-to-HARQ_feedback timing indicator" field of the DCI can indicate K1, which is information (value) about the slot in which the scheduled PUCCH is transmitted. Here, K1 may be a non-negative integer value. The DCI of DCI format 1_0 can indicate one of {0, 1, 2, 3, 4, 5, 6, 7} as the K1 value. The K1 value that can be indicated by the DCI of DCI formats 1_1 and 1_2 can be set (configured) by a higher layer.

[0142] A method for determining a slot in which a PUCCH including a first type of HARQ-ACK is transmitted will be described. There may be an uplink slot that overlaps with the last symbol in which a PDSCH corresponding to the HARQ-ACK is transmitted. In this case, if the index of the overlapping uplink slot is m, the terminal can transmit the PUCCH including the HARQ-ACK in slot m+K1. The index of the uplink slot may be a value determined based on the subcarrier spacing of the BWP in which the PUCCH is transmitted. When downlink slot aggregation is configured in the terminal, the last symbol in which the PDSCH is transmitted may mean the last scheduled symbol in the last slot among the slots in which the PDSCH is transmitted.

[0143] FIG. 15 illustrates a method for scheduling a physical uplink control channel according to an embodiment of the present invention.

[0144] Referring to FIG. 15, the subcarrier spacing of the DL BWP in which the PDCCH is received, the subcarrier spacing of the DL BWP in which the PDSCH is scheduled, and the subcarrier spacing of the UL BWP in which the PUCCH is transmitted may be the same. The terminal may receive the PDCCH scheduling the PDSCH and the PUCCH from the base station in slot n. In this case, the DCI included in the PDCCH received in slot n may set (indicate) the K0 value to 2 and the K1 value to 3. For example, if the last symbol in which the PDSCH is transmitted is n+K0 (i.e., n+2), the terminal may transmit the HARQ-ACK for the PDSCH on slot n+2+K1 (i.e., n+5). In this case, the HARQ-ACK for the PDSCH may be included in the PUCCH.

[0145] FIG. 16 illustrates repeated transmission of a physical uplink control channel according to one embodiment of the present invention.

[0146] To ensure wide coverage in the NR system, the terminal can repeatedly transmit the long PUCCH on 2, 4, or 8 slots. In this case, the format of the long PUCCH may be PUCCH format 1, 3, or 4. When the terminal repeatedly transmits the PUCCH, the same UCI may be repeatedly transmitted in every slot. Referring to FIG. 16, when the reception of the PDSCH ends in slot n and the K1 value is 2, the terminal can transmit the PUCCH on slot n+K1 (i.e., n+2). When the base station sets the number of repeated transmissions of the PUCCH to 4 (N repeat PUCCH = 4), the terminal can repeatedly transmit the PUCCH on slots n+2 to n+5. In this case, the symbol configuration of the repeatedly transmitted PUCCH may be the same. That is, the repeatedly transmitted PUCCH may start from the same symbol in each slot and be configured with the same number of symbols.

[0147] In PUCCH transmission, frequency hopping may also be applied to obtain diversity gain in the frequency domain. When intra-slot frequency hopping is applied, the terminal divides the time domain of a slot in which the PUCCH is transmitted into two, and transmits half of the PUCCH on the first PRB and the other half on the second PRB. The first and second PRBs may be configured by a higher layer that configures PUCCH resources. When inter-slot frequency hopping is applied, the terminal may transmit the PUCCH on the first PRB of a slot whose slot index is an even number, and transmit the PUCCH on the second PRB of a slot whose slot index is an odd number. In addition, when the terminal performs PUCCH repeated transmission, if a symbol of a specific slot scheduled for PUCCH transmission overlaps with a semi-statically configured DL symbol or a symbol set for receiving an SS / PBCH block, the terminal may not transmit the PUCCH on the slot including the overlapping symbol. The terminal may postpone the PUCCH that is not transmitted to be transmitted on the next slot. In this case, if the symbol for PUCCH transmission of the postponed slot does not overlap with the semi-statically configured DL symbol or the symbol set for receiving the SS / PBCH block, the terminal can transmit the PUCCH.

[0148] In this specification, a problem associated with repeated transmission of a PUSCH or PUCCH of a terminal to improve coverage performance may be referred to as a PUSCH or PUCCH coverage problem.

[0149] FIG. 17 illustrates a problem that occurs when a UE repeatedly transmits a PUSCH in a TDD situation according to an embodiment of the present invention.

[0150] Referring to FIG. 17, in a TDD situation, a "D" slot may be a slot in which all symbols are configured as downlink symbols, a "U" slot may be a slot in which all symbols are configured as uplink symbols, and an "S" slot may be a slot other than a "D" slot and a "U" slot. In this case, the "S" slot may include at least one flexible symbol. A PUSCH repetitive transmission type B may be configured in the "S" slot and the "U" slot. Even if the base station configures (instructs) the terminal to have a nominal PUSCH length of 6 symbols, the length of the actual PUSCH may be 2, 3, or 4 depending on the slot boundary and the invalid symbols. Each of the repeated actual PUSCHs may include one DMRS symbol. When one DMRS symbol is mapped to one actual PUSCH, the length of the data symbol transmitted in the actual PUSCH may be 1, 2, or 3 symbols. Compared with a 6-symbol PUSCH transmission, the terminal must use a higher code rate when transmitting a transport block (TB) with the same number of bits. Therefore, even if repetitive transmission is set to improve coverage performance, a high coding rate must be used, and it is difficult to ensure coding gain. That is, the coverage problem cannot be solved if a terminal simply repeats PUSCH by PUSCH repetitive transmission type B. In addition, a PUSCH consisting of a small number of symbols must include at least one DMRS symbol, and the smaller the number of symbols constituting the actual PUSCH, the larger the DMRS overhead becomes, and therefore the coverage performance for uplink channels and signals transmitted by terminals at cell-edges may be degraded.

[0151] FIG. 18 illustrates a problem that occurs when a terminal repeatedly transmits a PUCCH in a TDD situation according to one embodiment of the present invention.

[0152] Referring to case a of FIG. 18, in the TDD situation, repeated transmission of PUCCH may be configured on the "S" slot and the "U" slot. A PUCCH with a total symbol length of 4 from symbol 10 to symbol 13 in the slot may be configured, and PUCCH having the same position and length may be repeatedly transmitted over two slots. That is, the first repeated transmission of PUCCH may be transmitted on symbols 10 to 13 of the first slot, and the second repeated transmission of PUCCH may be transmitted on symbols 10 to 13 of the second slot. In this case, symbols 0 to 9 of the second slot cannot be used for repeated transmission of PUCCH. Therefore, if the UL symbols available for repeated transmission of PUCCH are limited, a coverage problem may occur. For repeated transmission of PUCCH with high reliability, limited UL symbols (symbols unavailable for repeated transmission of PUCCH) need to be used.

[0153] Hereinafter, a solution for improving coverage performance by PUSCH repetitive transmission type B and PUCCH repetitive transmission described with reference to FIG. 17 and FIG. 18 will be described.

[0154] In order to solve the coverage problem that occurs when the PUSCH is repeatedly transmitted, a plurality of actual PUSCHs may be jointly transmitted. In the following, for convenience of explanation, the actual PUSCH is not actually transmitted, and a PUSCH determined by a method to be described later may be actually transmitted.

[0155] One or more actual PUSCHs may be combined to form a combined actual PUSCH, and the combined actual PUSCH may be transmitted. Actual PUSCHs that are consecutive in the time domain may be combined to form one combined actual PUSCH. "Consecutive in the time domain" may mean that there is no symbol between two consecutive actual PUSCHs. When a terminal combines and transmits PUSCHs that are repeatedly transmitted, the number of symbols of the entire PUSCH including the repeated transmission should not exceed the number of symbols that have been set before. That is, the number of symbols of the entire combined actual PUSCH transmitted to improve coverage should not exceed the number of symbols that have been set before. The number of symbols that have been set before may be a value that the base station sets in the terminal. Also, the number of symbols that have been set before may be the maximum number of symbols that constitute a slot. The maximum number of symbols that constitute a slot may be 14 in a normal CP and 12 in an extended CP.

[0156] FIG. 19 illustrates a method of combining PUSCHs transmitted repeatedly according to an embodiment of the present invention.

[0157] With reference to FIG. 19(a), the number of symbols already set may be 14. Actual PUSCH #1 to actual PUSCH #3 are combined to form combined PUSCH #1, and actual PUSCH #4 and actual PUSCH #5 are combined to form combined PUSCH #2. Actual PUSCH #1 to actual PUSCH #6 are composed of a total of 15 symbols. Therefore, the second symbol (symbol 13 of the second slot) may be dropped since it is a symbol that exceeds the already set number of symbols, 14 symbols. Therefore, the first symbol of actual PUSCH #6 (symbol 12 of the second slot) is composed of one symbol, and may be dropped by PUSCH mapping type B. With reference to FIG. 19(b), there may be no restriction on the number of symbols that constitute a PUSCH. Therefore, the two symbols of actual PUSCH #6 (symbols 12 and 13 in the second slot) are consecutive symbols and can be combined to form combined PUSCH #3, and the terminal can also transmit combined PUSCH #3 to the base station.

[0158] FIG. 20 illustrates a method of combining PUSCHs transmitted repeatedly according to an embodiment of the present invention.

[0159] When forming the above-mentioned combined PUSCH, the actual PUSCH may be combined in consideration of the slot boundary. With reference to FIG. 20(a), the number of symbols already set may be 14. Symbols in which the actual PUSCHs are transmitted, which are consecutive from symbol 10 of the first slot, may be combined, and at this time, the combination may be based on the slot boundary. That is, the actual PUSCH#1 forms the combined PUSCH#1, the next consecutive actual PUSCH#2 and actual PUSCH#3 form the combined PUSCH#2, and the actual PUSCH#4 and actual PUSCH#5 form the combined PUSCH#3. Unlike FIG. 19, since there is a slot boundary between the actual PUSCH#1 and the actual PUSCH#2, the combined PUSCH#1 may be formed only by the actual#1. The second symbol of the actual PUSCH#6 (symbol 13 of the second slot) is a symbol that exceeds the already set number of symbols, 14, and therefore may be dropped. Therefore, the first symbol of actual PUSCH #6 (symbol 12 of the second slot) is composed of one symbol, and therefore may be dropped by PUSCH mapping type B. Referring to FIG. 20(b), there may be no restriction on the number of symbols constituting a PUSCH. Therefore, the two symbols of actual PUSCH #6 (symbols 12 and 13 of the second slot) are consecutive symbols and can be combined to form combined PUSCH #4, and the terminal can also transmit combined PUSCH #4 to the base station. In this case, the number of symbols constituting the combined PUSCH may be restricted. For example, the number of restricted symbols may be 2 to 14.

[0160] The terminal may generate one combined PUSCH by combining actual PUSCHs of a specific unit, and then transmit the combined PUSCH. The specific unit may be at least one of a set of symbols, a slot, or a set of slots. For example, if the specific unit is a slot, the actual PUSCHs in the slot may be combined to form one combined PUSCH. If the specific unit is a set of N symbols, the terminal may determine a set of symbols and combine the actual PUSCHs in the set of symbols to form one combined PUSCH. The set of symbols may be sequentially grouped in N-pieces starting from the first symbol of the slot or 10 ms radio frame. N may be a divisor of the number of symbols constituting the slot. For example, N may be 7 in the normal CP and 6 in the extended CP.

[0161] The base station may set (instruct) the number of actual PUSCHs constituting the combined PUSCH to the terminal. The combined PUSCH may be configured by combining the actual PUSCHs according to the set number. For example, if the set number is K, the combined PUSCH may be configured by combining K actual PUSCHs starting from the first actual PUSCH. Meanwhile, if the total number of actual PUSCHs is not a multiple of K, any one of the combined PUSCHs may be configured with the actual PUSCHs of the number corresponding to the remainder when the total number of actual PUSCHs is divided by K. The actual PUSCHs may be indexed in time order.

[0162] The combined PUSCH may be configured by combining actual PUSCHs corresponding to (or included in) one nominal PUSCH. One nominal PUSCH may be divided into one or more actual PUSCHs by a slot boundary or an invalid symbol. A plurality of actual PUSCHs separated from one nominal PUSCH may be combined to configure one combined PUSCH. i) When a plurality of actual PUSCHs separated from one nominal PUSCH are combined to configure one combined PUSCH, the slot boundary may be taken into consideration. That is, only actual PUSCHs in the same slot may be combined to configure a combined PUSCH. In other words, actual PUSCHs in different slots configure different combined PUSCHs. ii) When a plurality of actual PUSCHs separated from one nominal PUSCH are combined to configure one combined PUSCH, time continuity may be taken into consideration. That is, only consecutive actual PUSCHs may configure a combined PUSCH. In this case, consecutive actual PUSCHs in the time domain included in different slots can be combined to form one combined PUSCH. That is, discontinuous actual PUSCHs in the time domain form different combined PUSCHs. When consecutive actual PUSCHs in the time domain form one combined PUSCH regardless of slot boundaries, the number of symbols forming the combined PUSCH may be limited. For example, the number of symbols forming the combined PUSCH may be limited to the maximum number of symbols forming one slot, or may be limited to the number of symbols forming a slot required for coverage extension.

[0163] The base station may set (instruct) the terminal to have a minimum number of symbols constituting the combined PUSCH. The base station may determine the minimum number of symbols constituting the combined PUSCH in consideration of at least one of the DMRS overhead, the size of the TB, and the coding rate. That is, the combined PUSCH may be configured by combining the actual PUSCHs to have a length equal to or greater than the minimum number. For example, if the minimum number is M and the lengths of the actual PUSCHs are A1, A2, and A3, respectively, if A1 is smaller than M, the minimum number of symbols constituting the combined PUSCH is not satisfied, so that the actual PUSCH of A1 length may be combined with the actual PUSCH of A2 length to form the combined PUSCH. On the other hand, if A1+A2 is still smaller than M, the actual PUSCH of A3 length may be combined to form the combined PUSCH. In other words, if the length of the actual PUSCH or the length of the combined PUSCH is greater than or equal to M, no additional actual PUSCH needs to be combined.

[0164] The base station may set (instruct) the maximum number of symbols constituting the combined PUSCH to the terminal. The base station may determine the maximum number of symbols constituting the combined PUSCH in consideration of at least one of the DMRS overhead, the size of the TB, and the coding rate. In this case, the maximum number may be 14 symbols. That is, the combined PUSCH may be configured by combining the actual PUSCH to have a length equal to or less than the maximum number. For example, when the maximum number is M and the lengths of the actual PUSCHs are A1, A2, and A3, if A1 is smaller than M but A1+A2 is larger than M, the maximum number of symbols is exceeded, so that the actual PUSCH of A1 length does not need to be combined with the actual PUSCH of A2 length. If A1+A2 is smaller than M, the maximum number of symbols is not exceeded, so that the actual PUSCH of A1 length can be combined with the actual PUSCH of A2 length to form the combined PUSCH. In a similar manner, it may be determined whether to combine actual PUSCHs of A3 length. This allows the length of the combined PUSCH to be maintained at or below a certain symbol length. In other words, the terminal does not need to transmit a combined PUSCH that exceeds a certain length.

[0165] The base station can set (instruct) the minimum length of the actual PUSCH that must be combined to the terminal. For example, in PUSCH repetitive transmission type B, an actual PUSCH with a length of one symbol may be dropped or omitted without being transmitted. Therefore, the actual PUSCH that is dropped or omitted may be combined with another actual PUSCH and transmitted. For example, when the minimum length of the actual PUSCH is M and the lengths of the actual PUSCH are A1, A2, and A3, an actual PUSCH with a length smaller than M among A1, A2, and A3 can be combined with another adjacent actual PUSCH to form a combined PUSCH. In this case, the number of actual PUSCHs to be combined may be two. i) An actual PUSCH with a length smaller than the minimum length may be combined with the actual PUSCH with the shorter length among two adjacent actual PUSCHs. For example, actual PUSCH#2 in FIG. 17 may be combined with actual PUSCH#3, which has a shorter length, among actual PUSCH#1 and actual PUSCH#3. The terminal can efficiently use the dropped or omitted resources by combining the actual PUSCH to be dropped or omitted with other actual PUSCHs and transmitting them. In addition, by combining actual PUSCHs, DMRS overhead can be reduced, and data transmission rate can be increased. ii) An actual PUSCH having a length smaller than the minimum length may be combined with the actual PUSCH having a longer length among two adjacent actual PUSCHs. For example, in FIG. 17, actual PUSCH#2 may be combined with actual PUSCH#1, which has a longer length, among actual PUSCH#1 and actual PUSCH#3. Since PUSCH can be transmitted using resources on a relatively long time domain, it is effective for coverage extension. iii) An actual PUSCH having a length smaller than the minimum length may be combined with the actual PUSCH located earlier in time among two adjacent actual PUSCHs.Since the PUSCH is transmitted for a long time starting from an earlier time domain resource, the coverage is extended and the delay is reduced. iv) An actual PUSCH having a length smaller than the minimum length may be combined with the actual PUSCH located later in time among two adjacent actual PUSCHs. In the delay-insensitive PUSCH transmission, the PUSCH can be transmitted on a long time resource, which is advantageous for coverage extension.

[0166] The combined PUSCH may be configured by combining symbols included in the nominal PUSCH. In this case, the above-mentioned process of dividing the nominal PUSCH into the actual PUSCH may be omitted. That is, the combined PUSCH may be directly generated from the nominal PUSCH. i) The base station may set (instruct) the minimum number of symbols constituting the combined PUSCH to the terminal. The terminal may determine the number of symbols included in the nominal PUSCH. In this case, invalid symbols may be excluded. The combined PUSCH may be configured from the minimum number of symbols included in the nominal PUSCH. Since this is the minimum number, the combined PUSCH may be configured from a number of symbols greater than the minimum number. The combined PUSCH may be configured in consideration of consecutive symbols and / or slot boundaries. Specifically, the combined PUSCH may be configured from a minimum number of symbols included in the nominal PUSCH, and if there are consecutive symbols after the last symbol of the minimum number of symbols, the consecutive symbols may be further combined to form the combined PUSCH. In this case, if consecutive symbols cross a slot boundary, the slots that cross the slot boundary may not be combined. That is, the further combined symbols may be symbols in the same slot. ii) The base station can set (instruct) the terminal to the maximum number of symbols constituting the combined PUSCH. That is, if the number of symbols constituting the combined PUSCH exceeds the maximum number, a new additional combined PUSCH can be configured. For example, the maximum number may be the maximum number of symbols constituting 14 or X slots. iii) The base station can set (instruct) the terminal to the number of configurable combined PUSCHs. The terminal can determine the number of symbols constituting the nominal PUSCH. In this case, ineffective symbols may be excluded. For example, if the number of symbols constituting the nominal PUSCH is S and the number of configurable combined PUSCHs is Y, the combined PUSCH may be configured with floor(S / Y) or ceil(S / Y) symbols.floor(x) is a function that returns the largest integer less than or equal to x. ceil(x) is a function that returns the smallest integer greater than or equal to x.

[0167] Hereinafter, a frequency hopping method for obtaining diversity gain when a terminal combines and transmits a plurality of actual PUSCHs will be described.

[0168] i) The terminal can transmit odd-numbered combined PUSCHs in the first PRB and even-numbered combined PUSCHs in the second PRB. The base station can set an offset value for the PRB interval between the first PRB and the second PRB in the terminal, and the terminal can transmit the combined PUSCH based on the offset value. ii) The terminal can divide the combined PUSCH into two or more parts in the time domain and transmit the divided combined PUSCHs by frequency hopping. For example, the combined PUSCH can be divided into two parts in the time domain. If the two divided parts are the first hop and the second hop, the difference between the symbols constituting the first hop and the second hop can be set to a minimum. When the number of symbols of the combined PUSCH is N PUSCH symb Then, the number of symbols that make up the first hop is floor(N PUSCH symb / 2), and the number of symbols that make up the second hop is N PUSCH symb -floor(N PUSCH symb / 2), or the number of symbols that make up the first hop may be ceil(N PUSCH symb / 2), and the number of symbols that make up the second hop is N PUSCH symb -ceil(N PUSCH symb / 2). In this case, the first hop may be transmitted on the first PRB, and the second hop may be transmitted on the second PRB. The base station may set an offset value for the PRB interval between the first PRB and the second PRB to the terminal, and the terminal may transmit the combined PUSCH based on the offset value. iii) The base station may set a minimum number of symbols per hop for transmitting the combined PUSCH to the terminal. The terminal may compare the number of symbols constituting the combined PUSCH with the minimum number of symbols per hop and transmit the combined PUSCH using frequency hopping. For example, when the number of symbols of the combined PUSCH is smaller than or equal to the minimum number of symbols per hop, the terminal may transmit the combined PUSCH without frequency hopping. Conversely, when the number of symbols of the combined PUSCH is larger than the minimum number of symbols per hop, the terminal may transmit the combined PUSCH by dividing it into two or more hops. In this case, the method of transmitting the divided two or more hops may be the same as ii) described above. Two or more hops may be divided based on the minimum number of symbols per hop. That is, the symbols constituting the combined PUSCH may be bundled with the minimum number of symbols to form a hop. If the number of symbols of the combined PUSCH is not a multiple of the minimum number of symbols per hop, the number of symbols constituting any one of the divided hops may be equal to the remainder when the number of symbols constituting the combined PUSCH is divided by the minimum number of symbols per hop.

[0169] The frequency hopping described below may be applied regardless of the combined PUSCH.

[0170] 21 to 26 show a frequency hopping method for a PUSCH that is repeatedly transmitted according to an embodiment of the present invention.

[0171] The entire length of the PUSCH that is repeatedly transmitted may be divided in half in the time domain to perform frequency hopping. i) The entire length of the PUSCH that is repeatedly transmitted may be divided in half to determine a hopping boundary for frequency hopping, and the repeated PUSCH may be transmitted based on the determined hopping boundary. PUSCH symb Then, the number of symbols of the PUSCH that constitutes the first hop is floor(N PUSCH symb / 2), and the number of PUSCH symbols constituting the second hop is N PUSCH symb -floor(N PUSCH symb / 2) (method a). Alternatively, the number of symbols of the PUSCH constituting the first hop may be ceil(N PUSCH symb / 2), and the number of PUSCH symbols constituting the second hop is N PUSCH symb -ceiling(N PUSCH symb / 2) (method b). For example, the total length of the PUSCH that is repeatedly transmitted may be a value obtained by adding up the lengths of each actual PUSCH. Referring to FIG. 21, when PUSCH repetitive transmission type B is configured, the total actual PUSCH length obtained by adding up the lengths of each actual PUSCH may be 15 (i.e., the sum of the lengths of actual PUSCH #1 to actual PUSCH #6). When the above-mentioned method a is applied, the number of symbols constituting the first hop may be 7 (from symbol 10 of the first slot to symbol 2 of the second slot). The number of symbols constituting the second hop may be 8 (symbol 3 of the second slot, symbols 6 to 10 of the second slot, and symbols 12 and 13 of the second slot). In this case, when the method of PUSCH repetitive transmission type B is applied to the second hop, as described above, since the PUSCH consisting of one symbol is a DMRS symbol, the terminal does not need to transmit the PUSCH consisting of one symbol (the first symbol of the second hop). When the above-mentioned method b is applied, the first hop may be composed of 8 symbols and the second hop may be composed of 7 symbols. Therefore, the terminal can transmit the PUSCH without any dropped symbols. As another example, when the base station and the terminal know both the symbol configuration information and the configuration for invalid symbols, the terminal can determine the hopping boundary so that the PUSCH composed of one symbol does not occur. That is, referring to FIG. 21, when the terminal and the base station both know the symbol configuration, the terminal can transmit the PUSCH without any dropped symbols by applying the method b to configure the first hop with 8 symbols and the second hop with 7 symbols. Also, the total length of the repeatedly transmitted PUSCH may be the same as the total length of the nominal PUSCH. Referring to FIG. 22, the total length of the nominal PUSCH may be 18 symbols (Nominal #1 to Nominal #3). The first hop may consist of 9 symbols (symbol 10 in the first slot to symbol 4 in the second slot) and the second hop may consist of 9 symbols (symbol 5 in the second slot to symbol 13 in the second slot).The terminal may transmit the first hop and the second hop using frequency hopping. ii) The total length of the PUSCH repeatedly transmitted in i) above may be the length of one nominal PUSCH or the length of the longest actual PUSCH among the actual PUSCHs. The first hop divided by i) and ii) above may be transmitted on a first PRB, and the second hop may be transmitted on a second PRB. In this specification, a PUSCH / PUCCH symbol or a PUSCH / PUCCH symbol may mean a symbol on which a PUSCH / PUCCH is transmitted.

[0172] Consecutive PUSCH symbols may be configured as the same hop. When the base station configures the terminal to transmit the PUSCH repeatedly, consecutive symbols to which the actual PUSCH is assigned may be configured as one hop. In this case, the number of symbols constituting one hop may be a variable value rather than a fixed value. Referring to FIG. 23, eight consecutive symbols (symbol 10 of the first slot to symbol 3 of the second slot) from the start symbol (symbol 10 of the first slot) of the repeatedly transmitted PUSCH to an invalid symbol (symbol 4 of the second slot) may be configured as one hop (first hop). Five consecutive symbols (symbol 6 of the first slot to symbol 10 of the second slot) from the next repeatedly transmitted PUSCH symbol (symbol 6 of the second slot) to the next invalid symbol (symbol 11 of the second slot) may be configured as another hop (second hop). Two consecutive symbols from the next repeatedly transmitted PUSCH symbol (symbol 12 of the second slot) may be configured as another hop (third hop). In this case, the first hop and the third hop may be transmitted on the same frequency domain resource or on different frequency domain resources. Even if consecutive symbols are included in different slots, they are configured as one hop, which has the effect of reducing DMRS overhead compared to when one hop is configured only with symbols in the same slot. However, there may be a problem that the number of hops may increase due to the inclusion of invalid symbols in one slot, and DMRS overhead may increase when DMRS is to be assigned to each hop. However, in a situation where the channel delay spread and channel change on the time axis are not large within one slot, the frequency domain resources on which odd-numbered hops (e.g., the first hop and the third hop) are transmitted may always be set to be the same, and the frequency domain resources on which even-numbered hops (e.g., the second hop and the fourth hop) are transmitted may always be set to be the same.By always setting the frequency domain resources for transmitting odd-numbered / even-numbered hops to be the same, the problem of increased DMRS overhead due to an increase in hops can be solved.

[0173] Based on the slot boundary, consecutive PUSCH symbols may be configured as one hop. Referring to FIG. 24, four consecutive symbols (symbols 10 to 13 in the first slot) from the start symbol (symbol 10 in the first slot) of the repeatedly transmitted PUSCH to the slot boundary may constitute the first hop, four consecutive symbols (symbols 0 to 3 in the second slot) from the next PUSCH symbol (symbol 0 in the second slot) to the invalid symbol (symbol 4 in the second slot) may constitute the second hop, five consecutive symbols (symbols 6 to 10 in the second slot) from the next PUSCH symbol (symbol 6 in the second slot) to the next invalid symbol (symbol 11 in the second slot) may constitute the third hop, and two consecutive symbols (symbols 12 and 13 in the second slot) from the next PUSCH symbol (symbol 12 in the second slot) may constitute the fourth hop. As described above, odd-numbered hops and even-numbered hops may be transmitted on the same frequency domain resource. This maintains the characteristics of NR, where scheduling is done on a slot-by-slot basis and transmission units are set, and is effective in terms of compatibility.

[0174] One frequency hop may be composed of a specific number of symbols that have already been set. In this case, the specific number of symbols may be the maximum number of symbols that can constitute one hop. In other words, if the number of consecutive symbols is smaller than the specific number of symbols, one hop may be composed of a number of consecutive symbols that is smaller than the specific number of symbols. In this case, the specific number that has already been set may be a value that the base station sets in the terminal. The specific number that has already been set may be the same as the length of the nominal PUSCH. Since the length of the nominal PUSCH is fixed, one hop may be composed of the same number of symbols as the nominal PUSCH in time order. In this case, downlink symbols or invalid symbols may be excluded from the symbols that constitute one hop. Referring to FIG. 25, the number of symbols of one nominal PUSCH is 6 symbols. If consecutive PUSCH symbols in the time domain are configured as one hop, the first hop may be configured with six symbols (symbol 10 of the first slot to symbol 1 of the second slot), the second hop may be configured with the next six symbols (symbols 2, 3, 6, 7, 8, and 9 of the second slot), and the third hop may be configured with the remaining symbols (symbols 12 and 13 of the second slot). In this case, since consecutive symbols can be transmitted as one hop, symbol 10 of the second slot does not have any surrounding symbols that can be grouped together as one hop. Therefore, when PUSCH repetitive transmission type B is applied, symbol 10 of the second slot is a PUSCH with a length of one symbol, so it does not need to be transmitted. In this case, the first hop and the third hop may be transmitted in the same frequency domain resource. As another example, the previously set specific number may be any one of the divisors of the total number of symbols of the PUSCH to be repeatedly transmitted. The total number of symbols of the actual PUSCH is N, and N may be a natural number rather than a decimal number. The number of symbols constituting one hop may be a divisor of N excluding 1 and N. That is, one hop may be composed of a specific number of consecutive or non-consecutive symbols.Also, after forming a hop with a specific number of consecutive symbols, if a PUSCH of one symbol exists, the PUSCH of one symbol may be dropped. Specifically, the specific number of symbols may be i) the maximum number among the divisors of N excluding 1 and N. By determining the maximum number as the number of symbols forming one hop, the PUSCH can be transmitted in a longer time domain using the same PRB, and coverage can be extended. Referring to FIG. 26(a), when the total number of symbols (N) of the actual PUSCH is 15, 5, which is the maximum number among the remaining divisors of 15 excluding 1 and 15, may be determined as the number of symbols forming one hop. That is, the terminal can form one hop with five PUSCH symbols that are consecutive or not consecutive in time order from the symbol (symbol 10 of the first slot) where the repeatedly transmitted PUSCH starts. ii) The specific number of symbols may be the minimum number among the divisors of N excluding 1 and N. By determining the minimum number as the number of symbols constituting one hop, the hopping period becomes shorter, and the transmission of hops on other PRBs can be performed frequently in a short time domain. Referring to FIG. 26(b), when the total number of symbols (N) of the actual PUSCH is 15, the number of symbols constituting one hop may be determined to be 3, which is the minimum number among the divisors of 15 excluding 1 and 15. That is, the terminal can configure three PUSCH symbols that are consecutive or not consecutive in time order from the symbol (symbol 10 of the first slot) at which the repeatedly transmitted PUSCH begins as one hop. In this case, symbol 6 and symbol 10 of the second slot are PUSCHs with a length of 1 symbol and may not be transmitted. In other words, after configuring one hop with a specific number of symbols, regardless of whether they are consecutive or not, a PUSCH with a symbol length of 1 that does not have consecutive symbols may not be transmitted.

[0175] The base station may set (instruct) to the base station a specific unit in which frequency hopping may be performed. That is, PUSCH symbols included in the specific unit may constitute one hop, and frequency hopping may be performed based on the boundary of the specific unit. The specific unit may be at least one of a symbol set, a slot set, or a symbol set determined by a nominal PUSCH and a slot set determined by a nominal PUSCH.

[0176] When the specific unit is a symbol set, the base station can set (instruct) the number of symbols (N) constituting the symbol set to the terminal. The terminal can generate the symbol set by collecting N symbols starting from the first symbol of the radio frame. The scheduled repeatedly transmitted PUSCH can be configured as one hop by the symbol set. That is, the length of one symbol set can be the length of one hop. The PUSCH included in the odd-numbered symbol set can be transmitted on the first PRB, and the PUSCH included in the even-numbered symbol set can be transmitted on the second PRB.

[0177] When the specific unit is a symbol set determined by the nominal PUSCH, the number of symbols (N) constituting the symbol set may be the same as the length of the nominal PUSCH. The terminal may generate the symbol set by collecting N symbols from the first symbol where the nominal PUSCH is scheduled. In this case, the base station may set (instruct) a natural number (K) for adjusting the number of symbols constituting the symbol set to the terminal. The terminal may generate the symbol set by collecting N*K symbols from the first symbol where the nominal PUSCH is scheduled. That is, the natural number (K) may extend the number of symbols included in the symbol set to a multiple of the length of the nominal PUSCH. The scheduled PUSCH may be configured as one hop by the symbol set. That is, the length of one symbol set may be the length of one hop. The PUSCH included in the odd-numbered symbol set may be transmitted on a first PRB, and the PUSCH included in the even-numbered symbol set may be transmitted on a second PRB.

[0178] When the specific unit is a slot set, the base station can set (instruct) the number of slots (N) constituting the slot set to the terminal. The terminal can generate a slot set by grouping N slots starting from the first slot of a radio frame. The scheduled PUSCH can be configured as one hop by the slot set. That is, the length of one slot set can be the length of one hop. The PUSCH included in the odd-numbered symbol set can be transmitted on a first PRB, and the PUSCH included in the even-numbered symbol set can be transmitted on a second PRB.

[0179] When the specific unit is a slot set determined by a nominal PUSCH, the base station can set (instruct) the number of slots (N) constituting the slot set to the terminal. The terminal can generate a slot set by grouping N slots from the first slot in which the nominal PUSCH is scheduled. The scheduled PUSCH may be configured as one hop by the slot set. That is, the length of one slot set may be the length of one hop. The PUSCH included in the odd-numbered symbol set may be transmitted on the first PRB, and the PUSCH included in the even-numbered symbol set may be transmitted on the second PRB. Similarly, hereafter, the first hop may be transmitted on the first PRB, and the second hop may be transmitted on the second PRB.

[0180] i) The frequency hopping may be determined based on the number of slots in which the nominal PUSCH is scheduled. PUSCH slot Then, the number of slots that make up the first hop is floor(N PUSCH slot / 2), and the number of slots that make up the second hop is N PUSCH slot -floor(N PUSCH slot / 2), or the number of slots that make up the first hop may be ceil(N PUSCH slot / 2), and the number of slots that make up the second hop is N PUSCH slot -ceil(N PUSCH slot / 2), where the first hop may be configured starting from the slot where the nominal PUSCH is scheduled.

[0181] ii) Frequency hopping may be determined based on the number of slots in which the actual PUSCH is scheduled. The number of slots in which the actual PUSCH is scheduled is N PUSCH slot Then, the number of slots constituting the first hop and the number of slots constituting the second hop may be determined to be the same as in i) above. In this case, the number of slots in which the nominal PUSCH is scheduled but all the nominal PUSCH symbols are excluded due to invalid symbols is N PUSCH slot In this case, the first hop may be configured starting from the slot where the nominal PUSCH is scheduled.

[0182] iii) Frequency hopping may be determined based on the number of the longest consecutive symbols among the consecutive symbols in the time domain among the actual PUSCH. The actual PUSCH may be one or more actual PUSCHs that are repeatedly transmitted. That is, when the repeated transmission of the PUSCH is configured for the terminal from the base station, frequency hopping may be determined based on the actual PUSCH. In this case, the actual PUSCH having a number of symbols less than the number of symbols configured by the terminal as one hop may not be hopped. For example, the terminal may configure one hop with the number of symbols of the longest consecutive PUSCH in the time domain. The number of symbols of the longest PUSCH may be N. PUSCH symb,max Then, the number of symbols constituting the first hop and the second hop is N PUSCH symb,max That is, the terminal may receive N PUSCHsymb,max The PUSCH transmitted with N symbols is transmitted on the first PRB, and the subsequent N PUSCH symb,max The PUSCH transmitted with N symbols may be transmitted on the second PRB. As another example, one hop may be configured with a number of symbols equal to the number of symbols of the longest PUSCH divided evenly in the time domain. PUSCH symb,max Then, the number of symbols that make up the first hop is floor(N PUSCH symb,max / 2), and the number of symbols that make up the second hop is N PUSCH symb,max -floor(N PUSCH symb,max / 2), or the number of symbols that make up the first hop is ceil(N PUSCH symb,max / 2), and the number of symbols that make up the second hop is N PUSCH symb,max -ceil(N PUSCH symb,max / 2), where the first hop may be configured starting from the symbol where the actual PUSCH is scheduled.

[0183] iv) Frequency hopping may be determined based on the shortest number of consecutive symbols among consecutive symbols in the time domain of the actual PUSCH. There may be one actual PUSCH. That is, when the terminal is configured to transmit a PUSCH from the base station, the terminal may determine frequency hopping based on the actual PUSCH. The shortest number of consecutive symbols may be N PUSCH symb,min Then, the number of symbols that make up the first and second hops is N PUSCH symb,min In this case, the first hop may be configured starting from the symbol where the PUSCH is scheduled.

[0184] A method for determining the positions and the number of DMRS symbols of a combined PUSCH to be mapped will be described below. The DMRS symbol described in this specification may refer to a symbol to which a DMRS is mapped.

[0185] FIG. 27 illustrates a method for determining a symbol position to which a DMRS included in a PUSCH that is repeatedly transmitted is mapped according to an embodiment of the present invention.

[0186] The terminal may determine the position of the DMRS symbol by regarding all or a part of consecutive PUSCH symbols constituting a combined PUSCH as one transmission group. In this case, the terminal may always map the DMRS to the first symbol of the consecutive PUSCH symbols constituting one transmission group by applying only PUSCH mapping type B. When the base station configures (instructs) the terminal to have additional DMRS symbols, the base station may configure the number of additional DMRS symbols in the terminal. The position of the additional DMRS symbol may be determined according to the PUSCH mapping type. One transmission group may be consecutive PUSCH symbols or hops. Referring to FIG. 27(a), the number of symbols of combined PUSCH#1, combined PUSCH#2, and combined PUSCH#3, which are one transmission group, may be 8, 5, and 2, respectively. The terminal may map the additional DMRS to the position of the symbol according to the PUSCH mapping type based on the number of additional DMRSs configured by the base station. In this case, the number of additional DMRSs may be configured in a higher layer. For example, if the number of additional DMRS symbols is 0, the DMRS is only mapped to the first symbol of each transmission group. If the number of additional DMRS symbols is 1, the first and seventh symbols of combined PUSCH#1, the first and fifth symbols of combined PUSCH#2, and the first symbol of combined PUSCH#3 may be DMRS symbols. If the number of additional DMRS symbols is 2, the first, fourth, and seventh symbols of combined PUSCH#1, the first and fifth symbols of combined PUSCH#2, and the first symbol of combined PUSCH#3 may be DMRS symbols. If the number of additional DMRS symbols is 3, the first, fourth, and seventh symbols of combined PUSCH#1, the first and fifth symbols of combined PUSCH#2, and the first symbol of combined PUSCH#3 may be DMRS symbols. On the other hand, a PUSCH with a length of 1 in the time domain may not be transmitted.Referring to FIG. 27(b), when repeated transmission of PUSCH using frequency hopping is configured, the number of symbols constituting one hop (transmission group) may be up to 7. Therefore, the position of the DMRS symbol may be determined regardless of whether frequency hopping is configured or not. That is, the DMRS symbol may be positioned in the same way as when frequency hopping is not configured (see FIG. 27(a)).

[0187] In the following, a new method for performing repeated transmission of PUCCH to solve a coverage problem (a problem in which UL symbols available for repeated transmission are limited) that occurs when repeated transmission of PUCCH is performed will be described. The format of PUCCH used for repeated transmission of PUCCH described below may be PUCCH format 1, 3, or 4 consisting of 4 or more symbols.

[0188] 28 to 30 show a method of repeatedly transmitting a PUCCH according to an embodiment of the present invention. In Fig. 28, actual#n means an actual PUCCH of index n, and virtual#n means a virtual PUCCH of index n.

[0189] PUCCH may be repeatedly transmitted regardless of slot boundaries. That is, PUCCH may be repeatedly transmitted on multiple slots in addition to one slot. In other words, PUCCH may be repeatedly transmitted on symbols including slot boundaries. The terminal may determine a time domain (section) in which the nominal PUCCH is transmitted based on the number of PUCCH symbols and the number of times of PUCCH repetition set by the base station. The determined nominal PUCCH may be divided into actual PUCCHs based on slot boundaries, DL symbols, and ineffective symbols. Unlike PUSCH repetitive transmission type B, in order to ensure PUCCH repetitive transmission as much as possible, ineffective symbols in the nominal PUCCH may be configured as virtual symbols, and the configured virtual symbols may be transmitted in the UL symbol immediately after the symbol for which PUCCH transmission is possible. Referring to FIG. 28, the nominal PUCCH may be divided into actual PUCCHs #1 to #6 based on slot boundaries, DL symbols, and ineffective symbols. In this case, the invalid symbols in the nominal PUCCH (symbols 4, 5, and 11 in the second slot) are configured as virtual PUCCH#1, and virtual PUCCH#1 may be transmitted on the earliest symbol among the next transmittable UL symbols. The actual PUCCH may be configured of less than 4 symbols. Therefore, the terminal must combine each actual PUCCH to generate a combined PUCCH having a length of at least 4 symbols. This is because the PUCCH format used for repeated transmission of PUCCH must be configured of 4 to 14 symbols. For example, when the length of the first actual PUCCH is less than 4, if there is a second actual PUCCH adjacent to the first actual PUCCH in the time domain, the first actual PUCCH and the second actual PUCCH may be combined. In this case, "adjacent" means consecutive, and means that there is no symbol between the first actual PUCCH and the second actual PUCCH. Referring to FIG. 28, actual PUCCH #2 and actual PUCCH #3 are adjacent to each other.Since there are two invalid symbols (symbols 4 and 5 in the second slot) between actual PUCCH #3 and actual PUCCH #4, actual PUCCH #3 and actual PUCCH #4 are not adjacent. There may be two adjacent actual PUCCHs. Referring to FIG. 28, actual PUCCH #2 is adjacent to actual PUCCH #1 and actual PUCCH #3. Therefore, the terminal can select one PUCCH to combine from the two adjacent actual PUCCHs.

[0190] i) Of two adjacent actual PUCCHs, the shorter actual PUCCH may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #3, which is shorter than actual PUCCH #1 and actual PUCCH #3. Actual PUCCHs consisting of three or less symbols may be dropped, but may be transmitted without being dropped by combining. Also, by combining short actual PUCCHs, the overhead of PUCCH DMRS can be reduced, and there is an effect of increasing the data transmission rate. ii) Of two adjacent actual PUCCHs, the longer actual PUCCH may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #1, which is longer than actual PUCCH #1. By selecting and combining a longer actual PUCCH, PUCCH can be transmitted using long time resources, which is effective for coverage extension. iii) Of two adjacent actual PUCCHs, the actual PUCCH that is earlier in time may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #1 that is earlier in time among actual PUCCH #1 and actual PUCCH #3. This allows PUCCH transmission to be performed over a longer time period starting from the earlier time resource, thus providing the effect of coverage extension and reducing delay for UCI transmission including HARQ-ACK. iv) Of two adjacent actual PUCCHs, the actual PUCCH that is later in time may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #3 that is later in time among actual PUCCH #1 and actual PUCCH #3. By combining the later actual PUCCH, PUCCH transmission including UCI that is not sensitive to delay is enabled to be performed over a longer time resource, thus providing the effect of coverage extension.

[0191] The length of the combined PUCCH formed by combining the first actual PUCCH and the second actual PUCCH may be 14 symbols or less. That is, the first actual PUCCH and the second actual PUCCH are not combined to exceed 14 symbols. In other words, if the actual PUCCH selected by the above i) to iv) is the second actual PUCCH and the first actual PUCCH and the second actual PUCCH are combined to form a combined PUCCH exceeding 14 symbols, another adjacent third actual PUCCH to be combined with the first actual PUCCH may be selected. In this case, if the length of the first actual PUCCH is 3 symbols or less and there is no adjacent third actual PUCCH, the terminal may drop the first actual PUCCH without transmitting it. When the terminal repeatedly transmits a PUCCH including a slot boundary, the length of the repeatedly transmitted PUCCH may not exceed the number of symbols that have been set. The number of symbols already set may be a value set by the base station to the terminal. The number of symbols set may be a value that the base station can set to the terminal, or may be the maximum number of symbols constituting a slot. As another embodiment, when the PUCCH is transmitted on a resource including a slot boundary, the length of the PUCCH may not be limited. That is, the terminal can transmit the PUCCH to the base station on a resource including a slot boundary where the number of symbols is not limited. However, when the number of symbols is 4 to 14, the PUCCH may be transmitted using the above-mentioned long PUCCH format. Also, when the PUCCH is configured on a resource including a slot boundary, the number of symbols available for PUCCH transmission may exceed 14. In this case, since the existing PUCCH format is configured only with 14 or less symbols, a new PUCCH format using more than 14 consecutive symbols is needed (hereinafter, referred to as an extended PUCCH format). That is, the terminal can transmit the PUCCH configured in the form of the extended PUCCH format to the base station.In the existing PUCCH format 1, since the DMRS symbol and the subsequent symbol for transmitting UCI are consecutive, an extended PUCCH format can be configured by partially modifying the existing PUCCH format 1. For example, a PUCCH consisting of 15 symbols may have a structure in which, in addition to the one symbol to which the DMRS was mapped in the existing PUCCH format 1, the DMRS is additionally mapped to the symbol consecutive to the one symbol. A PUCCH consisting of 16 symbols may have a structure in which one symbol of DMRS and one symbol for transmitting UCI are further added to the existing PUCCH format 1. In the extended PUCCH format which is a partial modification of the existing PUCCH format 3 or PUCCH format 4, the position of the symbol to which the DMRS is mapped may be determined according to the number of increased symbols. For example, when 1 to 3 symbols are added, the increased symbols may be configured by being mapped in the order of the UCI symbol, the DMRS symbol, and the UCI symbol. That is, when one symbol is added, the added symbol may be a UCI symbol, when two symbols are added, the added symbols may be a UCI symbol and a DMRS symbol, when three symbols are added, the added symbols may be a UCI symbol, a DMRS symbol, and a UCI symbol.When four or more symbols are added, the configuration of the existing PUCCH format 3 or PUCCH format 4 consisting of 4 to 14 symbols may be applied to the added symbols in the same manner.

[0192] The base station may configure a resource region for transmitting the PUCCH to be repeatedly transmitted, and in this case, multiple start symbols and multiple lengths may be configured in the resource region. For example, two start symbols (S1, S2) and two lengths (L1, L2) may be configured in one resource region for transmitting the PUCCH. The terminal may determine the symbol for transmitting the first repeated PUCCH from S1 and L1. The terminal may determine the symbol for transmitting the second repeated PUCCH from S2 and L2. In this case, UCI may be included in the first repeated PUCCH and the second repeated PUCCH. In addition, the base station may further configure information regarding a slot index. In this case, the slot indicated by the slot index may be a slot for which the above-mentioned multiple start symbols and multiple lengths are configured. In this case, the first repeated PUCCH may be transmitted on the first slot, and the second repeated PUCCH may be transmitted on the second slot. On the other hand, if information on slot index is not set, the first repetition PUCCH may be transmitted on a first slot determined based on the K1 value, and the second repetition PUCCH may be transmitted on a second slot following the first slot. In this case, the second slot may be the slot immediately following the first slot. Also, the second slot may be the earliest slot in which PUCCH transmission is possible after the first slot. That is, if the slot immediately following the first slot does not include a UL resource available for PUCCH transmission, the second PUCCH may be transmitted in a slot including a UL resource. The K1 value may be a value indicated by the DCI as described above.

[0193] A base station may configure a plurality of PUCCH resources for a terminal, and one start symbol and one length may be configured for each PUCCH resource. The terminal may determine a symbol corresponding to the one start symbol and one length among the symbols of each slot in which the PUCCH is repeatedly transmitted, and determine whether the determined symbol is usable for PUCCH transmission. The PUCCH may be repeatedly transmitted in the longest continuous symbol interval among the symbols usable for PUCCH transmission. Referring to FIG. 29, a base station may configure a terminal to repeatedly transmit the PUCCH in two slots by setting a start symbol (S) of 4 and a length (L) of 10. In other words, the base station configures the PUCCH to be transmitted using symbols 4 to 13. However, there may be cases in which the PUCCH cannot be transmitted in a symbol interval according to the start symbol and length configured by the base station in a slot. Symbols 0 to 9 of the first slot cannot be used for PUCCH transmission. In this case, the first repetition PUCCH may be transmitted on symbols 10 to 13, which are the longest consecutive symbols available for PUCCH transmission within the set symbol interval. If flexible symbols are also available for PUCCH transmission, the first repetition PUCCH may be transmitted on symbols 8 to 13. Similarly, the second repetition PUCCH may be transmitted on symbols 6 to 10 in the second slot. Meanwhile, if there is no symbol available for PUCCH transmission within a specific slot or the available symbol interval is less than 4 symbols, the specific slot is not used for PUCCH repetition transmission. That is, the number of PUCCH repetition transmissions is not subtracted.

[0194] Repeated transmission of PUCCH may be performed simultaneously on inter-slot and intra-slot. When the base station configures PUCCH repeated transmission on inter-slot and PUCCH repeated transmission on intra-slot to the terminal, a resource of PUCCH repeatedly transmitted on intra-slot and a resource of PUCCH repeatedly transmitted on inter-slot may be configured. Alternatively, an additional PUCCH resource may be configured in addition to the PUCCH resource configured on intra-slot. That is, the PUCCH transmitted on intra-slot is the PUCCH repeatedly transmitted first, and an intra-slot resource for the PUCCH repeatedly transmitted second may be configured. In this case, the start position of the intra-slot resource repeatedly transmitted second may be determined as "start symbol position of inter-slot PUCCH-number of symbols of inter-slot PUCCH", and the number of symbols may be configured to be the same as that of the inter-slot PUCCH. Referring to FIG. 30, a PUCCH whose start symbol is symbol 10 and whose length is 4 symbols may be configured to be repeatedly transmitted on inter-slot. In this case, since intra-slot repeat transmission of the inter-slot repeat transmission PUCCH is possible from symbol 6 in the second slot, repeat transmission of the inter-slot PUCCH and the intra-slot PUCCH may be performed simultaneously in the second slot.

[0195] In the following, a frequency hopping method for obtaining diversity gain when PUCCH repeated transmission is performed to solve the coverage problem will be described.

[0196] The terminal may determine a frequency hopping boundary for performing PUCCH repetitive transmission based on a specific boundary. Information for determining the specific boundary is as follows: i) A specific boundary may be determined based on a boundary of PUCCH repetitive transmission. The terminal may transmit each PUCCH to be repeatedly transmitted using frequency hopping. With reference to FIG. 28, the hopping boundary may be a boundary of a nominal PUCCH, a boundary of an actual PUCCH, or a boundary of a combined PUCCH. PUCCH may be repeatedly transmitted by hopping for one nominal PUCCH, one actual PUCCH, or one combined PUCCH. With reference to FIG. 29, the terminal may transmit PUCCH repetition#1 of the first slot and PUCCH repetition#2 of the second slot on different frequency regions using frequency hopping. With reference to FIG. 30, the PUCCH repetitive transmission boundary between inter-slots and between intra-slots may be the frequency hopping boundary. The terminal may transmit the PUCCH of the first slot and the PUCCH of the second slot on different frequency regions. In this case, the intra-slot repeat transmission PUCCH added in the second slot may be configured with the same hop as the inter-slot repeat transmission PUCCH of the second slot and transmitted in the same frequency region. Or, the intra-slot repeat transmission PUCCH of the second slot may be configured with the same hop as the inter-slot repeat transmission PUCCH of the first slot and transmitted in the same frequency region. That is, multiple repeat transmission PUCCHs transmitted in one slot may be transmitted on different frequency regions. In other words, the intra-slot PUCCH and the inter-slot PUCCH of the second slot may be transmitted on different frequency regions. ii) The slot boundary may be determined based on a slot boundary, a semi-statically configured DL symbol, and an invalid symbol. Symbols available for consecutive / non-consecutive PUCCH repeat transmission up to the slot boundary, the semi-static DL symbol, or the invalid symbol may be configured with the same hop.In other words, the symbols available for consecutive / non-consecutive PUCCH repetition transmission before a slot boundary, a semi-static DL symbol, or an invalid symbol and the symbols available for consecutive / non-consecutive PUCCH repetition transmission after the slot boundary, semi-static DL symbol, or an invalid symbol may be configured as different hops. With reference to FIG. 28, actual PUCCH#1, actual PUCCH#2, and actual PUCCH#3 configured with forward resources based on symbol 4 of the second slot, which is an invalid symbol, may be configured as the first hop. Actual PUCCH#4 and actual PUCCH#5 configured with consecutive symbols available for PUCCH repetition transmission after symbol 4 of the second slot may be configured as the second hop. In a similar manner, actual PUCCH#6 may be configured as the first hop. With reference to FIG. 29, since there is a slot boundary and an invalid symbol between PUCCH repetition#1 and PUCCH repetition#2, PUCCH repetition#1 and PUCCH repetition#2 are configured as different hops. 30, the inter-slot repeat transmission PUCCH of the first slot may be configured as the first hop, and the intra-slot repeat transmission PUCCH and the inter-slot repeat transmission PUCCH of the second slot may be configured as the second hop. Different hops may be transmitted on different frequency regions.

[0197] The hopping boundary may be determined based on a previously set number of symbols. That is, each of the multiple hops may be configured with the same number of symbols. The previously set number of symbols may be acquired based on PUCCH configuration information configured by the base station. i) The hops may be configured with a value obtained by equally dividing the total number of symbols of the actual PUCCH that is repeatedly transmitted. Specifically, the number of symbols that constitute the first hop is floor(N repeat PUCCH / 2) or ceil(N repeat PUCCH / 2), and the number of symbols constituting the second hop may be N repeat PUCCH / 2-floor(N repeatPUCCH / 2) or N repeat PUCCH / 2-ceil(N repeat PUCCH / 2). N repeat PUCCHmeans the total number of symbols of the actual PUCCH. Referring to FIG. 28, since the total number of symbols of the actual PUCCH is 15, the first hop may be composed of 7 symbols (symbol 10 of the first slot to symbol 2 of the second slot), and the second hop may be composed of 8 symbols (symbols 3, 6 to 10, 12, and 13 of the second slot). Referring to FIG. 29, since the total number of symbols constituting the PUCCH is 9, the first hop may be composed of 4 symbols (symbol 10 to symbol 13 of the first slot), and the second hop may be composed of 5 symbols (symbol 6 to symbol 10 of the second slot). Referring to FIG. 30, since the total number of symbols constituting the PUCCH is 12, the first hop may be composed of 6 symbols (symbol 10 to symbol 13 of the first slot, and symbols 6 and 7 of the second slot), and the second hop may be composed of 6 symbols (symbol 8 to symbol 13 of the second slot). Alternatively, if the length of consecutive symbols included in one hop is 2 or less, the 2 or less consecutive symbols may be included in another hop. In this case, the other hop may include symbols adjacent to the 2 or less consecutive symbols, and may be a hop that can be transmitted on the same frequency region. Referring to FIG. 30, the second slot symbols 6 and 7 of the first hop may be included in the second hop and transmitted. ii) One hop may be configured based on the minimum number of consecutive symbols among all symbols of the PUCCH that are repeatedly transmitted. Referring to FIG. 28, the minimum number of consecutive symbols is 2 (actual PUCCH #2, #3, #6). Therefore, one hop may be configured with 2 symbols. Referring to FIG. 29, the minimum number of consecutive symbols is 4 (PUCCH repetition #1). Therefore, the first hop may be configured with 4 symbols (symbols 10 to 13 of the first slot), and the second hop may be configured with 4 symbols (symbols 6 to 9 of the second slot). By configuring the first hop and the second hop in this way, symbol 10 of the second slot remains, but the terminal does not need to transmit a PUCCH consisting of one symbol.That is, the terminal may drop symbol 10 of the second slot. Referring to FIG. 30, the minimum number of consecutive symbols is 4. Therefore, the first hop may be composed of 4 symbols (symbols 10 to 13 of the first slot), the second hop may be composed of 4 symbols (symbols 6 to 9 of the second slot), and the third hop may be composed of 4 symbols (symbols 13 to 13 of the second slot). iii) One hop may be composed of a pre-set number of symbols. In this case, the pre-set number of symbols may be a value set by the base station to the terminal. Alternatively, the pre-set number of symbols may be the number of symbols constituting one PUCCH, i.e., the number of symbols of the PUCCH to be repeatedly transmitted. Referring to FIG. 28, the pre-set number of symbols may be 6. Therefore, the first hop may be composed of six symbols (symbol 10 of the first slot to symbol 1 of the second slot), the second hop may be composed of six symbols (symbols 2, 3, 6 to 9 of the second slot), and the third hop may be composed of three symbols (symbols 10, 12, and 13 of the second slot). In this case, the first hop and the third hop may be transmitted on the same frequency domain resource or on different frequency domain resources. With reference to FIG. 29, the number of symbols already set may be the number of symbols of the initially configured PUCCH (10 in FIG. 29). Therefore, all symbols of PUCCH repetition#1 and PUCCH repetition#2 may be configured as one hop. With reference to FIG. 30, the number of symbols already set may be the number of PUCCH symbols (4 in FIG. 30). The first hop may be composed of four symbols (symbols 10 to 13 in the first slot), the second hop may be composed of four symbols (symbols 6 to 9 in the second slot), and the third hop may be composed of four symbols (symbols 10 to 13 in the second slot). In this case, the first hop and the third hop may be transmitted on the same frequency domain resource or on different frequency domain resources. iv) One hop may be configured based on the number of the longest consecutive symbols among all symbols of the PUCCH that are repeatedly transmitted.For example, the number of symbols constituting one hop may be calculated by equally dividing the number of the longest consecutive symbols. Specifically, the number of symbols constituting the first hop is floor(N. repeat PUCCH / 2) or ceil(N repeat PUCCH / 2), and the number of symbols that make up the second hop is N repeat PUCCH -floor(N repeat PUCCH / 2) or N repeat PUCCH -ceil(N repeat PUCCH / 2). N repeat PUCCH may be the number of the longest consecutive symbols. repeat PUCCH / 2), N repeat PUCCH -floor(N repeat PUCCH / 2)) or max(floor(N repeat PUCCH / 2), N repeat PUCCH -floor(N repeat PUCCH The value corresponding to min(ceiling(N / 2)) may be the number of symbols that make up one hop. repeat PUCCH / 2), N repeat PUCCH -ceiling(N repeat PUCCH / 2)) or max(ceiling(N repeat PUCCH / 2), N repeat PUCCH -ceiling(N repeat PUCCHA value corresponding to (a, b) / 2) may be the number of symbols constituting one hop. max(a, b) is a function that returns the larger value of a and b, and min(a, b) is a function that returns the smaller value of a and b. Referring to FIG. 28, the longest number of consecutive symbols is 8, which is the sum of the number of symbols of actual PUCCH #1, the number of symbols of actual PUCCH #2, and the number of symbols of actual PUCCH #3. Therefore, 4, which is an evenly divided value of 8, may be the number of symbols constituting one hop. Referring to FIG. 29, the longest number of consecutive symbols is 5, which is the number of symbols of PUCCH repetition #2. Therefore, 2 or 3 may be the number of symbols constituting one hop.

[0198] If the number of consecutive symbols is less than the number of symbols that constitute one hop, the symbol is not hopped.

[0199] In the following, a method for solving the coverage problem without combining multiple PUSCHs will be described.

[0200] 31 and 32 show a method of repeatedly transmitting a PUSCH according to one embodiment of the present invention.

[0201] The PUSCH may be transmitted on resources including slot boundaries. The resources including slot boundaries may be set so as not to exceed a previously set length. That is, the PUSCH transmitted on resources including slot boundaries may be transmitted on resources having a previously set number of symbols or less. The previously set length may be a value set by the base station to the terminal. Or, the previously set length may be the maximum number of symbols constituting a slot. Meanwhile, the length of resources including slot boundaries may not be limited. That is, the terminal can transmit PUSCH with no limit on the number of symbols. In this case, the position of the DMRS included in the PUSCH may be set by the base station. For example, when the length of resources including slot boundaries is 14 symbols or less, the DMRS can be mapped in the same way as the existing PUSCH structure. When the length of resources including slot boundaries exceeds 14 symbols, the existing PUSCH structure consisting of 1 to 14 symbols may be applied to symbols exceeding 14 symbols in the same way. That is, when the length of a resource including a slot boundary is 15 to 28 symbols and PUSCH mapping type B is applied, the front-loaded DMRS may be mapped to the first symbol (i.e., the 15th symbol) of the symbols exceeding 14 symbols. In addition, when an additional DMRS is further configured, the DMRS position applied to the existing PUSCH consisting of 2 to 14 symbols may be equally applied to the symbols exceeding 14 symbols to map the additional DMRS.

[0202] The base station may configure the terminal to repeatedly transmit the PUSCH on resources including the slot boundary. In this case, the terminal may repeatedly transmit the PUSCH based on a specific boundary. i) The specific boundary may be a slot boundary. That is, the terminal may repeatedly transmit the PUSCH by determining the slot boundary as a criterion for repeated transmission. Referring to FIG. 31, the PUSCH may be repeatedly transmitted on 6 symbols including the slot boundary. If 6 symbols from symbol 12 of slot n include the slot boundary, the PUSCH may be repeatedly transmitted from symbol 12 of slot n to symbol 3 of slot n+1. ii) The specific boundary may be a virtual slot boundary. The virtual slot boundary is a newly defined slot boundary regardless of the existing slot boundary, and may be defined when the PUSCH is transmitted on a resource including the existing slot boundary. Referring to FIG. 32, the base station may configure the terminal to repeatedly transmit the PUSCH from symbol 12 of slot n-1 to a 6-symbol length in 2 slots. In this case, the first symbol of the repeatedly transmitted PUSCH (symbol 12 of slot n-1) may be the start point of the virtual slot boundary. And, the PUSCH can be transmitted with the set number of repeated transmissions. That is, the symbol where the PUSCH transmission starts may be the first symbol of the virtual slot. The maximum number of symbols constituting a virtual slot may be equal to or greater than 14 for a normal CP and 12 for an extended CP.

[0203] In order to improve coverage of the PUCCH and the PUSCH, the DMRSs included in different PUCCHs that are repeatedly transmitted and different PUSCHs that are repeatedly transmitted may be jointly used for channel estimation.

[0204] Conventionally, the DMRS included in the first PUCCH repeatedly transmitted is used for channel estimation for decoding the first PUCCH, and the DMRS included in the second PUCCH repeatedly transmitted is used for channel estimation for decoding the second PUCCH. That is, the DMRS included in different PUCCHs is used only for the purpose of decoding the PUCCH including the DMRS. Hereinafter, a method in which a base station performs channel estimation by combining DMRS included in different PUCCHs / PUSCHs (hereinafter, referred to as joint channel estimation) will be described. The method described below will be described based on PUCCH for convenience of explanation, but it is obvious that it can also be applied to PUSCH.

[0205] Joint Channel Estimation Conditions

[0206] - Same starting PRB index: The starting positions of PRBs to which DMRSs included in different repeatedly transmitted PUCCHs are mapped must be the same in the frequency domain.

[0207] - Same number of PRBs: The number of PRBs to which DMRSs included in different PUCCHs that are repeatedly transmitted are mapped must be the same in the frequency domain.

[0208] Phase continuity: DMRSs included in different PUCCHs that are repeatedly transmitted must maintain the same phase.

[0209] -Same beamforming: DRMSs included in different PUCCHs that are repeatedly transmitted must be configured with the same beamforming.

[0210] - Same transmit power: DMRSs included in different PUCCHs that are repeatedly transmitted need to be transmitted with the same transmit power.

[0211] - Same quasi-co-location (QCL): DMRSs included in different PUCCHs that are repeatedly transmitted must have the same QCL (quasi-co-location).

[0212] The first DMRS included in the first PUCCH and the second DMRS included in the second PUCCH that are repeatedly transmitted may be mapped to different symbols and transmitted. That is, the first DMRS may be mapped to any one of the symbols scheduled for transmission of the first PUCCH, and the second DMRS may be mapped to any one of the symbols scheduled for transmission of the second PUCCH. In order for the base station to combine the first DMRS and the second DMRS and perform channel estimation, the above-mentioned conditions must be satisfied. The base station may combine the first DMRS and the second DMRS to perform channel estimation, and receive the first PUCCH and the second PUCCH that are repeatedly transmitted based on the channel estimation result.

[0213] Joint Channel Estimation Method

[0214] A specific method for joint channel estimation will now be described.

[0215] FIG. 33 illustrates a method for configuring resources for transmitting a PUCCH according to one embodiment of the present invention.

[0216] Referring to FIG. 33, the base station can transmit the following information to set resources on which the PUCCH is transmitted:

[0217] - Starting symbol index: The index of the symbol at which the transmission of the PUCCH starts in the time domain.

[0218] - number of symbols: number of symbols used for transmitting PUCCH in the time domain. PUCCH formats 0 and 2 are formats for transmitting PUCCH with 1 or 2 symbols. PUCCH formats 1, 3, and 4 are formats for transmitting PUCCH with 4 to 14 symbols. PUCCH formats 0 and 2 may be described as short PUCCH, and PUCCH formats 1, 3, and 4 may be described as long PUCCH.

[0219] - starting PRB index: the index of the PRB where the PUCCH transmission starts in the frequency domain.

[0220] - number of PRBs: number of PRBs used for transmitting PUCCH in the frequency domain. PUCCH formats 0, 1, and 4 are formats for transmitting PUCCH with one PRB. PUCCH format 2 is a format for transmitting PUCCH with 1 to 16 PRBs. PUCCH format 3 is a format for transmitting PUCCH with 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, and 16 PRBs.

[0221] - max code rate: The maximum code rate at which the PUCCH can be transmitted. The terminal cannot transmit a PUCCH that includes UCI with a code rate that exceeds the maximum code rate.

[0222] The terminal must determine the number of PRBs to be used in the PUCCH format for transmitting the PUCCH. First, the terminal may determine the number of bits (O bits) of UCI included in the PUCCH. The UCI may include a cyclic redundancy code (CRC). Then, the terminal may determine the number of REs (N) to which the UCI is mapped for each PRB. The terminal may determine the number of REs excluding the RE to which the DMRS is mapped. When the PUCCH is transmitted on M PRBs, the code rate may be calculated as O / (M*N*Q). Here, Q may represent a modulation order used for transmitting the PUCCH. Here, the calculated code rate should be equal to or lower than the maximum code rate. That is, O / (M*N*Q)≦maximum code rate must be satisfied. PUCCH formats 2 and 3, which can use multiple PRBs, may adjust the number of PRBs so that the code rate is equal to or lower than the maximum code rate. That is, among the number of possible PRBs (M), the minimum number of PRBs that satisfy O / (M*N*Q)≦maximum code rate may be selected. In this case, the minimum value of selectable PRBs may be preset, and the number of PRBs that is not smaller than the minimum value may be selected. The number of REs (N) may be determined based on the number of symbols used for PUCCH transmission. The number of REs may increase as the number of symbols used for PUCCH transmission increases. Specifically, N may be defined as N sc,ctrl and N symb-UCI It may be expressed as the product of N sc,ctrl is the number of REs that transmit UCI in one symbol corresponding to one PRB. symb-UCI is the number of symbols to transmit UCI. sc,ctrl is 8, and in PUCCH format 3, N sc,ctrl In PUCCH format 2, N symb-UCI is the number of symbols used for PUCCH transmission. In PUCCH format 3, N symb-UCI may be the number of symbols used for PUCCH transmission excluding the symbol to which the DMRS is mapped.

[0223] Fig. 34 shows that each of the PUCCHs repeatedly transmitted according to an embodiment of the present invention is transmitted with the same symbol length (number of symbols). Fig. 35 to Fig. 37 show that each of the PUCCHs repeatedly transmitted according to an embodiment of the present invention is transmitted with different symbol lengths.

[0224] Referring to FIG. 34, PUCCH0 and PUCCH1 may each include the same UCI. In this case, the length (number of symbols) of the resource in which PUCCH0 is transmitted and the length of the resource in which PUCCH1 is transmitted may be the same. And PUCCH0 and PUCCH1 may occupy the same PRB. The number of PRBs may be determined by the above-mentioned method. PUCCH0 and PUCCH1 may each include a symbol in which DMRS is transmitted. The base station may perform channel estimation by combining the DMRS of PUCCH0 (mapped to the 12th symbol of slot n) and the DMRS of PUCCH1 (mapped to the 2nd symbol of slot n+1). Also, the base station may receive UCI transmitted by PUCCH0 and PUCCH1 using joint channel estimation. Referring to FIG. 35, PUCCH0 and PUCCH1 may each include the same UCI. In this case, the length of the resource in which PUCCH0 is transmitted and the length of the resource in which PUCCH1 is transmitted may be different from each other. PUCCH0 may be transmitted on 4 symbols, and PUCCH1 may be transmitted on 11 symbols. Since the resource lengths on which PUCCH0 and PUCCH1 are transmitted are different from each other, the number of PRBs occupied by PUCCH0 and PUCCH1 may be different from each other. For example, PUCCH0 transmitted on 4 symbols may occupy a larger number of PRBs than PUCCH1 transmitted on 11 symbols. The number of PRBs may be determined by the above-mentioned method. In the PRBs occupied by PUCCH0 and PUCCH1, which overlap, DMRS may be combined to perform channel estimation. However, in the PRBs that do not overlap, DMRS for PUCCH1 is not transmitted, so joint channel estimation cannot be performed. Therefore, the base station may perform different channel estimation depending on the PRB, and an error may occur in the channel estimation value. A method for overcoming such an error will be described below. In addition, the method described below may not be applied when PUCCH is repeatedly transmitted by frequency hopping.

[0225] The number of PRBs for each of the repeatedly transmitted PUCCHs may be calculated independently of each other, that is, the number of PRBs may be determined based on the number of symbols allocated to each of the repeatedly transmitted PUCCHs.

[0226] How to determine the number of PRBs

[0227] Method 1

[0228] i) The starting PRB index of each PUCCH repeatedly transmitted may be the same as the starting PRB index of the PUCCH repeatedly transmitted first. Referring to FIG. 35, PUCCH0 and PUCCH1 are configured with different numbers of PRBs, but the starting PRB index of PUCCH1 is the same as the starting PRB index of PUCCH0. When the starting PRB index of the PUCCH repeatedly transmitted first is determined as the starting PRB index of the PUCCH repeatedly transmitted, there is a problem that joint channel estimation is possible for PRBs corresponding to a low frequency region, but joint channel estimation is not possible for PRBs corresponding to a high frequency region. ii) The last PRB index of each PUCCH repeatedly transmitted may be the same as the last PRB index of the PUCCH repeatedly transmitted first. The last PRB index is an index of a PRB corresponding to the highest frequency region occupied by the PUCCH in the frequency domain, and may be calculated as the sum of the starting index of the PRB (starting PRB index) and the number of PRBs (number of PRBs). Referring to FIG. 36, PUCCH0 and PUCCH1 may be configured with different numbers of PRBs. In this case, the last PRB index of PUCCH1 is the last PRB index of PUCCH0. When the last PRB index of the first transmitted PUCCH is determined as the last PRB index of the repeatedly transmitted PUCCH, there is a problem that joint channel estimation is possible for the PRB corresponding to the high frequency region, but joint channel estimation is not possible for the PRB corresponding to the low frequency region. iii) The intermediate resources in the frequency domain of each resource of the repeatedly transmitted PUCCH may be the same. Referring to FIG. 37, PUCCH0 and PUCCH1 may have different starting symbol indexes. In this case, the intermediate resources in the frequency domain constituting PUCCH0 and the intermediate resources in the frequency domain constituting PUCCH1 may be set to be as identical as possible.For example, the number of PRBs set in PUCCH0 may be M0, the starting symbol index may be S0, and the number of PRBs set in PUCCH1 may be M1, the starting symbol index may be S1. In this case, S1 may be calculated by dividing the difference between the PRBs set in PUCCH0 and PUCCH1 by 2, applying the result to a previously set function, and adding the returned value to S0. That is, S1 may be calculated as shown in Equation 1.

[0229] formula 1 S1 = S0 + f((M0-M1) / 2)

[0230] Here, f(x) may be any one of ceil(x), floor(x), or round(x). round(x) may return an integer value obtained by rounding x. Here, when M0 is greater than M1, S1 may be a negative number, so S1 may be limited to an integer equal to or greater than 0. That is, S1 may be calculated as max{0,S0+f((M0-M1) / 2)}. Since the resource on which PUCCH1 starting with S1 is transmitted may exceed the boundary of the active UL BWP, S1 may be limited to a value where the last PRB index of PUCCH1 is located within the active UL BWP. That is, S1 may be calculated as min{N RB -M1,S0+f((M0-M1) / 2)}. N RB may be the number of PRBs included in the active UL BWP. iv) The base station can set an offset value in the terminal. S1 may be calculated as S0+offset. That is, the starting PRB index may be determined using the offset within one frequency hop.

[0231] When Method 1 is used, joint channel estimation is not possible for the PUCCHs repeatedly transmitted in non-overlapping PRB regions, but only separate estimation is possible.

[0232] Method 2

[0233] The number of PRBs corresponding to each PUCCH that is repeatedly transmitted may be the same.

[0234] FIG. 38 illustrates a case in which the same number of PRBs are configured for each PUCCH that is repeatedly transmitted according to an embodiment of the present invention.

[0235] i) The same number of PRBs as the number of PRBs set in the first PUCCH to be repeatedly transmitted may be set in the remaining PUCCHs to be repeatedly transmitted. That is, the number of PRBs to be assigned to the PUCCHs to be repeatedly transmitted may be determined based on the number of symbols set in the first PUCCH to be repeatedly transmitted. At this time, the number of PRBs determined may not be related to the number of symbols assigned to each of the PUCCHs to be repeatedly transmitted. Referring to FIG. 38, the number of PRBs to be assigned to PUCCH0 may be determined based on four symbols used in PUCCH0 transmission. The same number of PRBs as the number of PRBs assigned to PUCCH0 may be assigned to PUCCH1. At this time, since the number of PRBs is determined in consideration of the maximum code rate for PUCCH0, it may not match the maximum code rate for PUCCH1. For example, when the number of symbols assigned to the first PUCCH to be repeatedly transmitted, which is the earliest in time, is large, the maximum code rate may be met even if the number of PRBs is small. Therefore, when the number of symbols of the PUCCHs to be repeatedly transmitted after the first repetition transmission is small, the maximum code rate may not be met. ii) As described above, the same number of PRBs as the number of PRBs set in the first PUCCH to be repeatedly transmitted may be set in the remaining repeated transmission PUCCHs. In this case, a coding rate may be calculated for each PUCCH to be repeatedly transmitted. If the calculated coding rate is greater than the maximum coding rate, the terminal may not transmit the PUCCH. Resources set in the PUCCH that is not transmitted may be used for repeated transmission of other adjacent PUCCHs. iii) The number of PRBs set in the PUCCH to which the fewest symbols are assigned among the repeatedly transmitted PUCCHs may be determined as the PRBs to be set in the repeatedly transmitted PUCCH. That is, the terminal may check the number of symbols assigned to each PUCCH to be repeatedly transmitted and determine the number of PRBs based on the PUCCH to which the fewest symbols are assigned. The determined number of PRBs may be applied regardless of the number of symbols assigned to the repeatedly transmitted PUCCH.Referring to FIG. 38, 4 symbols (3 symbols used for UCI transmission) may be assigned to PUCCH0, and 11 symbols (9 symbols used for UCI transmission) may be assigned to PUCCH1. Therefore, the number of PRBs of PUCCH0 to which the smallest number of symbols is assigned may be the number of PRBs of PUCCH1. In this case, when determining the smallest number of symbols, the symbols to which DMRSs are mapped may be excluded, and only the symbols used for UCI transmission may be used. iv) The largest number of PRBs among the PRBs configured for each PUCCH may be used for all PUCCH repeated transmissions. Referring to FIG. 38, when the number of PRBs configured for PUCCH0 is M0 and the number of PRBs configured for PUCCH1 is M1, the larger value of M0 and M1 may be selected. The PRBs corresponding to the selected value may be configured for PUCCH0 and PUCCH1. v) The same number of PRBs may be configured for each PUCCH that is repeatedly transmitted. That is, when the base station schedules repeated transmission of the PUCCH, the base station can schedule the number of PRBs set in each PUCCH to be repeatedly transmitted to be the same.

[0236] Method 3

[0237] 39 and 40 show PRBs for transmitting DMRSs configured in each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention. In this case, the number of PRBs for transmitting DMRSs configured in each of the repeatedly transmitted PUCCHs may be the same.

[0238] i) Referring to FIG. 39, the number of PRBs not exceeding the maximum code rate may be calculated for each PUCCH that is repeatedly transmitted. When the number of PRBs required for the transmission of PUCCH0 is M0 and the number of PRBs required for the transmission of PUCCH1 is M1, the PRB corresponding to the larger value of M0 and M1 may be used for the DMRS transmission. That is, the DMRS included in PUCCH1 may be transmitted using M0 PRBs. In other words, the DRMS ​​included in each of the repeatedly transmitted PUCCHs may be transmitted using the same number of PRBs. In this case, the UCI may be transmitted on the PRBs required for each PUCCH transmission. The UCI included in PUCCH1 may be transmitted using M1 PRBs.

[0239] ii) The number of PRBs for transmitting DMRS included in some PUCCHs among the repeatedly transmitted PUCCHs may be the same. In this case, the some PUCCHs may be PUCCHs adjacent in time. For example, the number of PRBs set to be the same may be the larger number of PRBs set in two adjacent PUCCHs. As another example, the number of PRBs set to be the same may be determined based on the time interval between symbols to which DMRSs are mapped. Referring to FIG. 40, the interval between the DMRS symbol included in PUCCH0 (the 12th symbol of slot n) and the first DMRS symbol included in PUCCH1 (the 3rd symbol of slot n+1) may be smaller than or equal to a certain value (window for DMRS extension). In this case, the number of PRBs to which DMRSs included in PUCCH0 and PUCCH1 are mapped may be the larger value of the number of PRBs set in PUCCH0 and the number of PRBs set in PUCCH1.

[0240] In order for the DMRSs included in the repeatedly transmitted PUCCH or PUSCH to be combined and used for channel estimation, the transmit power must be the same. A method for setting the transmit power to be the same (transmit power control) will be described below.

[0241] According to the 3GPP standard, the transmission power of the PUSCH may be determined as shown in Table 4.

[0242] [Table 4]

[0243] That is, when the terminal transmits a PUSCH on an active UL BWP (b) of a carrier (f) of a serving cell (c), the transmission power may be determined as shown in Equation 2.

[0244]

number

[0245] At this time, △ TF,b,f,c (i) may be determined as in Equation 3.

[0246]

number

[0247] K s may be 1.25 or 0. If the PUSCH includes a UL-SCH, β offset PUSCH may be 0. The BPRE may be determined as in Equation 4.

[0248]

number

[0249] C is the number of code blocks transmitted by PUSCH, and K r is the size (in bits) of the rth code block. RE is the number of REs allocated to the PUSCH, which may be calculated as in Equation 5:

[0250]

number

[0251]

number

number

number

[0252] N RE teeth,

number

[0253] In the following, a method for maintaining constant PUSCH transmit power for joint channel estimation using DMRS will be described.

[0254] Method for determining PUSCH transmission power

[0255] i) The terminal can calculate the transmission power of the PUSCH that is to be repeatedly transmitted for the first time. RE may be calculated using the number of symbols to transmit the PUSCH that is transmitted first repeatedly. That is,

number

[0256] ii) The terminal may calculate the transmission power of the PUSCH transmitted on the fewest symbols among the repeatedly transmitted PUSCHs. In this case, the calculated transmission power of the PUSCH may be used as the transmission power of all or part of the remaining repeatedly transmitted PUSCHs. RE may be calculated using the number of PUSCH symbols transmitted on the fewest symbols, i.e.

number

[0257] iii) The terminal is N RE The transmit power can be calculated based on the average of N RE may be the number of symbols for transmitting each PUSCH that is repeatedly transmitted.

[0258] iv) The UE may individually calculate the transmission power of each of the repeatedly transmitted PUSCHs, and the largest value among the calculated transmission powers may be the transmission power of all the repeatedly transmitted PUSCHs.

[0259] According to the 3GPP standard, the transmit power of the PUCCH may be determined as shown in Equation 6.

[0260]

number

[0261]

number

[0262]

number

[0263]

number

[0264]

number

[0265] In Equation 7,

number

number

[0266] Equation 8, which applies to PUCCH formats 2, 3, and 4, may be applied when the number of UCI bits is less than or equal to 11 bits. In this case, K 1 n in formula 8 may be 6. HARQ-ACK (i)+O SR (i)+O CSI (i) may be the number of bits of UCI transmitted by the PUCCH, where N RE (i) may be calculated as in Equation 10.

[0267] Equation 9, which is applied to PUCCH formats 2, 3, and 4, may be applied when the number of UCI bits is greater than 11 bits. In this case, K 2 may be 2.4. BPRE(i)=(O ACK (i)+O SR (i)+O CSI (i)+O CRC (i)) / N RE (i), and O ACK (i)+O SR (i)+O CSI (i)+O CRC (i) may be the number of bits of UCI transmitted by the PUCCH, where N RE (i) may be calculated as in Equation 10.

[0268]

number

[0269] N sc,ctrl and N symb-UCI As described above, the explanation is omitted. According to the formula 10, N RE is N symb-UCIThat is, when the number of symbols for the repeatedly transmitted PUCCHs is different, the transmission power may be determined differently. The transmission power of the PUCCH may be determined according to the number of symbols for the PUCCHs. Therefore, when the number of symbols for the repeatedly transmitted PUCCHs is different, a method for determining the same transmission power for joint channel estimation of the DMRSs included in each PUCCH is required.

[0270] Method for determining PUCCH transmission power

[0271] i) The terminal can calculate the transmission power of the PUCCH that is repeatedly transmitted for the first time. When calculating the transmission power, the number of symbols and the number of PRBs of the PUCCH that is repeatedly transmitted for the first time can be used. That is, when the PUCCH format is PUCCH format 0 or 1,

number

number

[0272] ii) The terminal may individually calculate the transmission power of each of the repeatedly transmitted PUCCHs, and the largest value among the calculated transmission powers may be the transmission power of all the repeatedly transmitted PUCCHs.

[0273] The following describes how to interpret the frequency hopping flag bit: The base station can configure the UE with a PUSCH repetition transmission mode of PUSCH repetition type-A or PUSCH repetition type-B.

[0274] PUSCH repetition type-A can be i) inter-slot hopping and ii) intra-slot hopping. Inter-slot hopping means that PUSCH is transmitted on a different frequency hop for each slot, and intra-slot hopping means that a terminal divides a PUSCH set for each slot into two and transmits them on a first frequency hop and a second frequency hop, respectively. A terminal may be configured with either inter-slot hopping or intra-slot hopping by a base station.

[0275] PUSCH repetition type-B can be i) inter-slot hopping and ii) inter-repetition hopping. Inter-slot hopping means that PUSCH is transmitted on a different frequency hop every slot, and inter-repetition hopping means that the terminal transmits each of the repeated nominal PUSCHs on a different frequency hop. The terminal may be configured by the base station to use either inter-slot hopping or inter-repetition hopping.

[0276] A 1-bit frequency hopping flag may be included in the DCI that schedules the PUSCH. The terminal can check whether or not to perform frequency hopping from the frequency hopping flag.

[0277] When the base station configures the inter-slot hopping of PUSCH repetition type-A in the terminal, the frequency hopping flag can indicate whether to perform inter-slot hopping to the terminal. However, if the number of repetitions of PUSCH is 1, the terminal can transmit PUSCH only on one slot. That is, inter-slot hopping is not performed regardless of the frequency hopping flag. In other words, if the number of repetitions of PUSCH is 1 when inter-slot hopping is configured, whether to perform inter-slot hopping may be determined according to the bit value of the frequency hopping flag.

[0278] When the base station configures the inter-slot hopping of PUSCH repetition type-B in the terminal, the frequency hopping flag can indicate whether or not to perform inter-slot hopping in the terminal. However, when the repeatedly transmitted PUSCH is transmitted only on the same slot, inter-slot hopping is not performed regardless of the frequency hopping flag. In other words, when the inter-slot hopping is configured and the repeatedly transmitted PUSCH is transmitted only on the same slot, whether or not to perform inter-repetition hopping may be determined according to the value of the frequency hopping flag.

[0279] When the base station configures the inter-repetition hopping of PUSCH repetition type-B in the terminal, the frequency hopping flag may indicate whether to perform inter-repetition hopping. However, if the number of repetitions of the PUSCH is 1, the terminal may transmit only the repeated nominal PUSCH. Inter-repetition hopping refers to hopping based on the repeated nominal PUSCH, and therefore, if the number of repetitions of the PUSCH is 1, inter-repetition hopping is not performed regardless of the value of the frequency hopping flag. That is, if the number of repetitions of the PUSCH is 1, it may be determined whether to perform inter-slot hopping depending on the value of the frequency hopping flag.

[0280] When a terminal performs uplink transmission (e.g., PUSCH and PUCCH), the terminal can use frequency hopping to obtain diversity gain in the frequency domain. In the NR system, uplink transmission can be performed in a maximum of two hops. The hops can refer to different frequency bands. Hereinafter, a method of determining the hops to obtain diversity gain in the frequency domain will be described.

[0281] How the hop is determined

[0282] When intra-slot hopping is configured, the UE may be configured (instructed) by the base station with the index of the symbol at which uplink transmission starts and the number of consecutive symbols for uplink transmission. Based on the index of the starting symbol and the number of consecutive symbols, the UE can determine the number of symbols for the first hop and the number of symbols for the second hop.

[0283] i) Specifically, if the number of consecutive symbols is N, the number of symbols in the first hop may be floor(N / 2) and the number of symbols in the second hop may be N-floor(N / 2). That is, the first hop may be composed of floor(N / 2) consecutive symbols from the symbol indicated by the index of the start symbol, and the second hop may be composed of N-floor(N / 2) consecutive symbols after the last symbol of the first hop. The terminal may perform uplink transmission by configuring more than two hops to obtain higher frequency domain diversity. Specifically, the following describes a method in which the terminal determines four hops when intra-slot hopping is configured.

[0284] If the number of symbols set for uplink transmission is N, the numbers of symbols included in the first hop, the second hop, the third hop, and the fourth hop may be determined based on N. First, N is defined as the number of symbols included in the first hop and the second hop (N 12 ) and the number of symbols included in the third and fourth hops (N 34) can be divided by N 12 is calculated on floor(N / 2), and N 34 may be computed on an N-floor (N / 2) basis. 12 Based on this, the number of symbols included in the first hop (N 1 ) and the number of symbols in the second hop (N 2 ) may be determined. Similarly, N 34 Based on this, the number of symbols included in the third hop (N 3 ) and the number of symbols in the fourth hop (N 4 ) may be determined. Specifically, N 1 ~N 4 may be calculated as in Equation 11.

[0285]

number

[0286] Equation 11 may be expressed as Equation 12.

[0287]

number

[0288] Table 5 shows the number of symbols included in the first to fourth hops depending on the number N of symbols.

[0289] [Table 5]

[0290] According to Table 5, depending on the number of symbols N, the number of symbols included in the first hop to the fourth hop can differ by up to one symbol.

[0291] For example, when a terminal transmits two uplink channels each having a length of 14 symbols starting from the first symbol of a slot, the first uplink channel may be transmitted in two hops and the second uplink channel may be transmitted in four hops. The first hop of the first uplink channel may be composed of seven symbols from the first symbol, and the second hop may be composed of the remaining seven symbols. That is, the boundary between the first and second hops of the first uplink channel may be between the seventh and eighth symbols of the slot. In other words, the boundary between the first and second hops of the first uplink channel may be between the end of the seventh symbol and the beginning of the eighth symbol. The first hop of the second uplink channel may be composed of three symbols from the first symbol, the second hop may be composed of the next four symbols, the third hop may be composed of the next three symbols, and the fourth hop may be composed of the next four symbols. The second uplink channel may include the same boundaries as the boundaries of the first uplink channel. That is, the boundary between the second and third hops of the second uplink channel is the same as the boundary between the first and second hops of the first uplink channel, so that frequency hopping can be performed at the same boundary, which is effective in terms of multiplexing between two uplink channels of the same length starting from the same symbol.

[0292] As yet another example, the first uplink channel may be configured with a length of 7 symbols starting from the first symbol of the slot, and the second uplink channel may be configured with a length of 14 symbols starting from the first symbol of the slot. In this case, the first uplink channel may be transmitted in two hops, and the second uplink channel may be configured with four hops. The first hop of the first uplink channel may be configured with three symbols from the first symbol, and the second hop may be configured with the remaining four symbols. The boundary of the two hops of the first uplink channel may be between the third symbol and the fourth symbol of the slot. In other words, the boundary of the two hops of the first uplink channel may be the end of the third symbol and the beginning of the fourth symbol. The first hop of the second uplink channel may be configured with three symbols from the first symbol, the second hop may be configured with the next four symbols, the third hop may be configured with the next three symbols, and the fourth hop may be configured with the next four symbols. Thus, the second uplink channel may include the same boundaries as the first uplink channel. That is, the boundary between the first and second hops of the second uplink channel may be the same as the boundary between the first and second hops of the first uplink channel, and therefore frequency hopping may be performed at the same boundary, which is effective in terms of multiplexing between two uplink channels of different lengths starting from the same symbol.

[0293] When the uplink channel is a PUSCH and the PUSCH is transmitted in a maximum of four hops, each hop may include at least one DM-RS symbol. For example, when the PUSCH is configured with 14 symbols and transmitted in four hops, the first hop may be configured with three symbols, the second hop with four symbols, the third hop with three symbols, and the fourth hop with four symbols, and each hop may include a symbol to which at least one DM-RS is mapped. In this case, if the mapping type of the PUSCH is PUSCH mapping type B, the DMRS may be mapped to the first symbol of each hop. However, in the case of PUSCH mapping type A, the position of the symbol to which the DMRS is mapped needs to be determined. When PUSCH mapping type A is configured, the DMRS may be mapped to the third symbol or the fourth symbol of the slot. In this case, whether the DMRS is mapped to the third symbol or the fourth symbol may be indicated by the PBCH. For example, when the PUSCH mapping type A is configured, the terminal can determine the hop that overlaps with the symbol to which the DMRS is to be mapped. In this case, if there is a hop that overlaps with the symbol to which the DMRS is to be mapped, the PUSCH may be transmitted with the DMRS mapped to the corresponding hop. That is, the DMRS may be mapped to the same position as the symbol to which the existing DMRS is to be mapped in the overlapping hop. The position of the symbol to which the DMRS is mapped in the hop that does not overlap with the symbol to which the DMRS is to be transmitted may be determined as in PUSCH mapping type B. That is, in the hop that does not overlap with the symbol to which the DMRS is to be mapped, the DMRS may be mapped to the first symbol. Specifically, there may be a case where the PUSCH is set to 14 symbols, the mapping type is PUSCH mapping type A, and the DMRS is mapped to the fourth symbol by the PBCH. As described above, when the PUSCH is configured with four hops, the number of symbols in the first hop may be three. Therefore, the fourth symbol does not exist in the first hop, and the DMRS is not mapped.In this case, the terminal may regard the length of the first hop as 4, and the length of the other hops having a length of 4 as 3. For example, according to Table 5, the first to fourth hops are composed of 3, 4, 3, and 4 symbols, but the terminal may regard the length of the first hop as 4, and the length of the second or fourth hop as 3. For example, the terminal may regard the lengths of the first to fourth hops as 4, 3, 3, and 4. Or, the terminal may regard the lengths of each hop determined according to Table 5 as hop lengths for DMRS mapping by permutation combination. For example, the terminal may regard the lengths of the first to fourth hops as 4, 3, 4, and 3.

[0294] ii) If the number of symbols configured for uplink transmission is N, the numbers of symbols included in the first hop, the second hop, the third hop, and the fourth hop may be determined based on N. Specifically, the numbers of symbols included in the first hop to the fourth hop (N1 to N4) may be calculated as shown in Equation 13.

[0295]

number

[0296] Table 6 shows the number of symbols included in the first to fourth hops depending on the number N of symbols.

[0297] [Table 6]

[0298] According to Table 6, the number of symbols included in the first hop to the fourth hop may differ by at most one symbol depending on the number of symbols N. As with the above-mentioned i), the method ii) is also effective in terms of multiplexing between two uplink channels of the same length starting from the same symbol. The method ii) is also effective in terms of multiplexing between two uplink channels of different lengths starting from different symbols. For example, there may be a first uplink channel of length 5 starting from the third symbol of a slot, and a second uplink channel of length 9 starting from the first symbol of a slot. In this case, the first uplink channel may be transmitted in two hops, and the second uplink channel may be transmitted in four hops. The first hop of the first uplink channel may be composed of the third and fourth symbols of a slot, and the second hop may be composed of the fifth to seventh symbols of a slot. The boundary between the first and second hops of the first uplink channel may be between the fourth and fifth symbols of a slot. The first hop of the second uplink channel may consist of two symbols starting from the first symbol, the second hop may consist of the next two symbols, the third hop may consist of the next three symbols, and the fourth hop may consist of the next two symbols. Thus, the second uplink channel may include the same boundaries as the first uplink channel. That is, the boundary between the second and third hops of the second uplink transmission is between the fourth and fifth symbols, and thus may include the same boundaries as the first uplink channel. Thus, frequency hopping may be performed at the same boundaries.

[0299] When a terminal transmits a PUSCH in a maximum of two hops, if the PUSCH and the PUCCH overlap on a certain symbol, the UCI of the PUCCH may be multiplexed into the PUSCH and transmitted. In this case, the UCI may be divided into two parts according to the type of UCI, and one half may be multiplexed into the first hop and the other half may be multiplexed into the second hop. The type of UCI may be HARQ-ACK, CSI part 1, or CSI part 2. For example, the HARQ-ACK is expressed as follows: ACK (1) and GACK (2) may be divided into two parts. G ACK (1)=N L *Q M *floor(G ACK / (2*N L *Q M ), G ACK (2))=N L *Q M *ceil(G ACK / (2*N L *Q M )).

[0300] N L is the number of layers of PUSCH, and Q m is the modulation order of PUSCH. HARQ-ACK is G ACK (1) is multiplexed to the first hop, and G ACK (2) may be multiplexed onto the second hop based on (2). CSI part 1 and CSI part 2 may also be multiplexed onto each hop in the same manner.

[0301] When a terminal transmits a PUSCH over a maximum of four hops, if the PUSCH and the PUCCH overlap on a certain symbol, the UCI of the PUCCH may be multiplexed into the PUSCH and transmitted.

[0302] i) The UE may divide UCI into four parts and multiplex each part into four hops of PUSCH. In this case, UCI may be divided into four parts according to the type of UCI, and the first 1 / 4 may be multiplexed into the first hop, the second 1 / 4 into the second hop, the third 1 / 4 into the third hop, and the last 1 / 4 into the fourth hop. The size of UCI multiplexed into each hop may be calculated as shown in Equation 14 or Equation 15.

[0303]

number

[0304]

number

[0305] HARQ-ACK is G according to Equation 14 or 15. ACK (1), G ACK (2) G ACK (3) G ACK (4) may be multiplexed to the first hop, the second hop, the third hop, and the fourth hop based on each of them. CSI part 1 and CSI part 2 may also be multiplexed to each hop in the same manner.

[0306] ii) The terminal may divide UCI and multiplex it into four hops of PUSCH. In this case, UCI may be divided into two according to the type of UCI, and the first half may be multiplexed into the first and second hops, and the remaining half may be multiplexed into the third and fourth hops. Alternatively, the first half may be multiplexed into the first and third hops, and the remaining half may be multiplexed into the second and fourth hops. That is, UCI may be divided into two, and each of the divided UCI may be repeatedly transmitted in two hops. In this case, the size of the divided UCI (A, B) is as follows:

[0307] A=N L *Q M *floor(G ACK / (2*N L *Q M )), B=N L *Q M *ceil(G ACK / (2*N L *Q M ))

[0308] Dividing the UCI into two, as opposed to dividing the UCI into four, allows the method of determining the UCI size based on two hops defined in the existing NR system to be reused, and it is also effective in terms of reliability because the UCI can be repeatedly transmitted over two different hops.

[0309] iii) Even if the PUSCH is configured to be transmitted in four hops, the UE can divide the UCI and transmit it in two hops. That is, the UCI is multiplexed and transmitted in two hops, and does not need to be multiplexed in the remaining two hops. The UE can reuse the method of determining the UCI size by two hops defined in the existing NR system and does not need to perform repeated transmission. Specifically, the method of selecting two hops out of four hops is as follows.

[0310] iii-a) The terminal can always select the two hops that are the earliest in time. That is, when the PUSCH is divided into four hops, the terminal multiplexes and transmits UCI in the first and second hops that are the earliest in time, and does not need to multiplex UCI in the third and fourth hops that are later in time. The base station can receive UCI earlier.

[0311] iii-b) The UE can always select the last two hops. That is, when the PUSCH is divided into four hops, the UE multiplexes and transmits UCI in the third and fourth hops that are the latest in time, and does not need to multiplex UCI in the first and second hops that are the earliest in time. The UE can secure time to multiplex UCI into PUSCH. Additional processing time may be required for the UE to multiplex UCI into PUSCH. In contrast to iii-a), iii-b) has more processing time and is easier to implement because UCI is multiplexed in the later hops.

[0312] iii-c) The terminal may determine two hops based on the hops of the PUSCH that overlap with the PUCCH. For example, the first hop and the next hop among the hops of the PUSCH that overlap with the PUCCH may be selected. As yet another example, the latest hop and the hop before it among the hops of the PUSCH that overlap with the PUCCH may be selected. When two hops are selected based on the hops of the PUSCH that overlap with the PUCCH, a timeline similar to the timeline (i.e., delay) when transmitting on the PUCCH may be provided.

[0313] iii-d) The terminal can select two odd-numbered hops. That is, the terminal can multiplex and transmit UCI on the first and third hops, and not multiplex UCI on the second and fourth hops. As yet another method, the terminal can select two even-numbered hops. That is, the terminal can multiplex and transmit UCI on the second and fourth hops, and not multiplex UCI on the first and third hops.

[0314] iii-e) The terminal can select two hops that are the furthest apart in the frequency domain. In the frequency domain, the distance can be calculated as the difference between the lowest PRBs of each hop. For example, when the first hop starts from PRB X1, the second hop starts from PRB X2, the third hop starts from PRB X3, and the fourth hop starts from PRB X4, the frequency domain distance between the i-th hop and the j-th hop is |X i -X j | is calculated, and the two hops with the greatest distance may be selected based on this value. The terminal may multiplex and transmit UCI to the two selected hops, and may not multiplex UCI to the remaining two hops. iii-e) is effective in terms of frequency diversity.

[0315] iii-f) The terminal can select two hops that are configured with a larger number of symbols. For example, when the PUSCH is 14 symbols and the numbers of symbols that configure the first hop, the second hop, the third hop, and the fourth hop are 3, 4, 3, and 4, the terminal multiplexes UCI into the second hop and the fourth hop and transmits it, and does not need to multiplex UCI into the first hop and the third hop.

[0316] iii-g) When two hops are selected by the methods of iii-a) to iii-f), a hop that satisfies a specific condition may be excluded. The specific condition may be that the symbol to which the DMRS is mapped is located at the last symbol of the hop, because UCI cannot be multiplexed in the symbol next to the symbol to which the DMRS is mapped. Alternatively, the specific condition may be that UCI cannot be multiplexed due to lack of resources after the symbol to which the DMRS of the hop is mapped.

[0317] iii-h) The base station can configure, in the terminal, the hops through which the UCI is multiplexed. Such a configuration can be configured by RRC signaling or can be configured by DCI.

[0318] A method of multiplexing UCI by frequency hopping when PUSCH is repeatedly transmitted will be described below. A UE can repeatedly transmit the same TB by repeatedly transmitting PUSCH. To improve coverage, DMRSs between different PUSCHs / PUCCHs that are repeatedly transmitted may be combined and used for channel estimation.

[0319] FIG. 41 shows a PUSCH that is repeatedly transmitted according to one embodiment of the present invention.

[0320] 42 and 43 show a method of multiplexing a PUSCH that is repeatedly transmitted and UCI included in the PUSCH that is repeatedly transmitted according to an embodiment of the present invention.

[0321] The first DMRS included in the first PUSCH that is repeatedly transmitted and the second DMRS included in the second PUSCH that is repeatedly transmitted may be transmitted on different symbols. That is, the first DMRS may be transmitted on a first symbol among the symbols on which the first PUSCH is scheduled, and the second DMRS may be transmitted on a second symbol among the symbols on which the second PUSCH is scheduled. When the terminal transmits the DMRS on the different PUSCHs that are repeatedly transmitted, phase continuity must be satisfied. That is, the first PUSCH and the second PUSCH may be transmitted in the same beamforming situation. Also, the first PUSCH and the second PUSCH must have the same quasi-co-locate (QCL). Also, the transmission power for transmitting the first PUSCH and the transmission power for transmitting the second PUSCH must be the same. The base station may perform channel estimation by combining the first DMRS and the second DMRS, and may receive the first PUSCH and the second PUSCH that are repeatedly transmitted based on the channel estimation result.

[0322] Of the PUSCHs that are repeatedly transmitted, some of the PUSCHs may be transmitted in a first frequency band, and the remaining PUSCHs may be transmitted in a second frequency band. In this case, the first frequency band may be the first hop, and the second frequency band may be the second hop. Thus, the first hop may include a plurality of PUSCHs that are repeatedly transmitted, and the second hop may include another plurality of PUSCHs that are repeatedly transmitted. With reference to FIG. 41(a), the PUSCHs may be configured to be repeatedly transmitted in four slots. In this case, in inter-slot frequency hopping, the first PUSCH may be repeatedly transmitted in the first slot, the second PUSCH may be repeatedly transmitted in the second slot, the third PUSCH may be repeatedly transmitted in the third slot, and the fourth PUSCH may be repeatedly transmitted in the fourth slot. Here, the first frequency band and the third frequency band may be the same, and the second frequency band and the fourth frequency band may be the same. With reference to FIG. 41(b), joint channel estimation may be configured. In this case, the first PUSCH repetition in the first slot and the second PUSCH repetition in the second slot may be transmitted in the first frequency band, and the third PUSCH repetition in the third slot and the fourth PUSCH repetition in the fourth slot may be transmitted in the second frequency band. The DMRS included in the first PUSCH repetition and the DMRS included in the second PUSCH repetition may be combined and used for channel estimation of the first frequency band, and the DMRS included in the third PUSCH and the DMRS included in the fourth PUSCH may be combined and used for channel estimation of the second frequency band.

[0323] UCI Multiplexing Method

[0324] The UCI included in the repeatedly transmitted PUSCH may be multiplexed and transmitted. In this case, if the repeatedly transmitted PUSCH is transmitted in different frequency bands (different hops), the UCI cannot obtain frequency diversity. The following describes how the UCI obtains frequency diversity. The PUSCH repetition described in this specification may have the same meaning as the repeatedly transmitted PUSCH.

[0325] When a PUSCH that is repeatedly transmitted multiple times is configured in each frequency band (each hop), one PUSCH may be selected for each frequency band. i) One PUSCH that is the earliest in time in each frequency band (each hop) may be selected. Referring to FIG. 41(b), a first PUSCH repetition and a second PUSCH repetition may be configured in a first frequency band (first hop), and in this case, the first PUSCH repetition that is the earliest in time may be selected from both. Similarly, when a third PUSCH repetition and a fourth PUSCH repetition are configured in a second frequency band (second hop), the third PUSCH repetition that is earlier in time may be selected. Thus, UCI may be multiplexed into the first PUSCH repetition and the third PUSCH repetition and transmitted. ii) One PUSCH repetition that is the last in time in each frequency band (each hop) may be selected. Referring to FIG. 41(b), when the first PUSCH repetition and the second PUSCH repetition are configured in the first frequency band (first hop), the second PUSCH repetition that is the last in time may be selected. Similarly, when the third PUSCH repetition and the fourth PUSCH repetition are configured in the second frequency band (second hop), the fourth PUSCH repetition that is the last in time may be selected. Thus, UCI may be multiplexed into the second PUSCH repetition and transmitted. Compared with multiplexing UCI into a previous PUSCH repetition, the method of multiplexing UCI into a subsequent PUSCH repetition has an effect of securing time margin required for UCI multiplexing. The PUSCH repetitions including UCI in the above-mentioned methods i) and ii) may not be consecutive PUSCH repetitions in time. Therefore, the base station may have to store UCI included in one PUSCH repetition and wait for another PUSCH repetition. For this reason, additional hardware for storing UCI may be required. Therefore, a method for transmitting UCI on consecutive PUSCHs is described. iii) One PUSCH repetition that is last in time in the previous frequency band (hop) in time may be selected, and one PUSCH repetition that is first in time in the next frequency band (hop) in time may be selected.Referring to FIG. 41(b), the second PUSCH repetition that is later in time may be selected from the first PUSCH repetition and the second PUSCH repetition set in the first frequency band (first hop). Similarly, the third PUSCH repetition that is earlier in time may be selected in the second frequency band (second hop). Thus, the UCI may be multiplexed into the second PUSCH repetition and the third PUSCH repetition and transmitted. That is, the UCI may be multiplexed into the second PUSCH and the third PUSCH that are consecutive PUSCHs in time and transmitted. iv) The base station may set an index of the PUSCH repetition into which the UCI is multiplexed. The terminal may multiplex the UCI into the PUSCH repetition determined by the index set by the base station and transmit the multiplexed UCI.

[0326] DMRS included in PUSCH repeatedly transmitted on the same PRB in the frequency domain may be jointly used for channel estimation (joint channel estimation). For joint channel estimation, in order to reduce DMRS overhead, improve channel estimation accuracy, and transmit a large amount of data, it is necessary to reduce the number of symbols to which DMRS is mapped (density) or repeatedly transmit PUSCH without DMRS (DMRS-less). Information that the base station sets in the terminal to set the number of symbols to which DMRS included in PUSCH is mapped is as follows. Hereinafter, PUSCH repeatedly transmitted on the same PRB may be referred to as a PUSCH bundle.

[0327] - Time domain resource allocation (TDRA): Time domain resource allocation information. This may include PUSCH mapping type, PUSCH starting symbol index and length in the time domain.

[0328] - Frequency hopping flag: A flag indicating the presence or absence of frequency hopping of the PUSCH, indicated by a 1-bit size in DCI of DCI format 0_1 ​​or 0_2 included in the PDCCH.

[0329] - dmrs-AdditionPosition: Information on the number of symbols and the symbol position to which the DMRS added according to the number of symbols constituting the PUSCH set by a higher layer is mapped.

[0330] When the PUCCH and the PUSCH overlap in the time domain, the terminal may multiplex the UCI into the PUSCH that is the earliest in the time domain among the overlapping PUSCHs, and may not transmit the PUCCH. When the UCI is multiplexed into the PUSCH, in order to ensure reliability, the HARQ-ACK may be mapped from the symbol immediately following the symbol to which the DMRS of the PUSCH is mapped. CSI-part1 and CSI-part2 may be mapped after the symbol to which the HARQ-ACK is mapped. In this case, if the HARQ-ACK is 2 bits or less, it may be punctured, and if it is more than 2 bits, it may be rate-matched. However, when the PUCCH and the PUSCH bundle overlap, there may be no symbol to which the DMRS is mapped in the PUSCH, and therefore the UCI may not be multiplexed. Hereinafter, a method of ensuring the reliability of the UCI by multiplexing the UCI and obtaining a PUSCH coverage gain will be described.

[0331] In order to ensure the reliability of UCI, the terminal may multiplex UCI only into a PUSCH in which a symbol to which DMRS is mapped exists. For joint channel estimation, the PUSCH in which UCI is multiplexed may be selected based on information to be described later. As the first information, when a symbol to which DMRS is mapped exists in a PUSCH overlapping with a PUCCH, the terminal may select the overlapping PUSCH and multiplex UCI. In other words, adjacent PUSCHs in the same PRB as the overlapping PUSCH are not considered when UCI is multiplexed. As the second information, a PUSCH in which a symbol to which DMRS is mapped exists among PUSCHs that are consecutive in the time domain and have the same PRB in the frequency domain may be selected, and UCI may be multiplexed. In addition to the PUSCH overlapping with the PUCCH, the terminal may perform segmentation and multiplex UCI into all PUSCHs in which a symbol to which DMRS is mapped exists among PUSCHs that are repeatedly transmitted consecutively in the same PRB as the overlapping PUSCH. As the third information, when there is no symbol to which DMRS is mapped in the PUSCH overlapping with the PUCCH, the terminal can multiplex UCI into k PUSCHs that are most adjacent to the overlapping PUSCH and transmit the multiplexed UCI. As the fourth information, when there is a symbol to which DMRS is mapped in the PUSCH overlapping with the PUCCH, the terminal can multiplex UCI into k PUSCHs that are most adjacent to the overlapping PUSCH and transmit the multiplexed UCI. In the third and fourth information, the adjacent PUSCHs must be PUSCHs that satisfy the above-mentioned condition for UCI to be multiplexed, and the k value may be a value set by the base station.

[0332] The terminal may select a PUSCH in which UCI is multiplexed, regardless of whether DMRS is included in the repeatedly transmitted PUSCH. i) The UCI may be equally segmented and multiplexed into the repeatedly transmitted PUSCH. The terminal may segment the UCI into as equal a size as possible and multiplex it into all PUSCHs in a PUSCH bundle overlapping with the PUCCH. For example, the UCI may be multiplexed only into PUSCHs in a PUSCH bundle overlapping with the PUCCH. As another example, the terminal may multiplex the UCI not only into a PUSCH bundle overlapping with the PUCCH but also into a PUSCH bundle set in another hop in the frequency domain. By multiplexing the UCI, in addition to joint channel estimation, coverage extension due to frequency diversity gain may be effective. ii) The UCI may be multiplexed into a specific PUSCH among the repeatedly transmitted PUSCHs. UCI may be multiplexed into PUSCHs corresponding to odd or even indexes in a PUSCH bundle overlapping with PUCCH. iii) UCI ​​may be multiplexed into as many PUSCHs as are set (instructed) by the base station among the PUSCH bundles overlapping with PUCCH. The base station may set (provide) to the terminal information (values) regarding the offset and period for the PUSCH into which UCI is multiplexed. Referring to FIG. 42, the base station may set (instruct) the offset to 1 and the period to 2 to the terminal. The terminal may multiplex UCI into the first PUSCH and the fourth PUSCH among the PUSCH bundles overlapping with PUCCH and transmit the multiplexed UCI. The base station may also set (provide) to the terminal information (values) regarding the index of the PUSCH into which UCI is multiplexed. Referring to FIG. 43, if the base station sets the index to 2 to the terminal, the terminal may multiplex UCI into the third PUSCH among the PUSCH bundles and transmit the multiplexed UCI. iv) Among the PUSCH bundles overlapping with the PUCCH, UCI may be multiplexed into the earliest PUSCH in the time domain. The terminal can multiplex UCI into the earliest PUSCH for early feedback such as HARQ-ACK.In the above i) to iv), when inter-slot frequency hopping is configured, the terminal may multiplex UCI only into a PUSCH bundle including a PUSCH that is the earliest in the time domain among PUSCHs overlapping with the PUCCH. Alternatively, the terminal may multiplex UCI into the same symbol position as a PUSCH bundle including a PUSCH that is the earliest in the time domain among overlapping PUSCHs for all frequency hops. In an embodiment in which UCI is multiplexed into a PUSCH that does not include a DMRS, the terminal may multiplex UCI into a PUSCH that does not have a DMRS symbol according to a new rule. The PUSCH that overlaps with the PUCCH in the above i) to iv) may refer to the entire repeated PUSCH including the PUSCH that overlaps with the PUCCH in a symbol or slot unit.

[0333] FIG. 44 illustrates cancellation of a PUSCH that is repeatedly transmitted based on a PUCCH that is repeatedly transmitted according to one embodiment of the present invention.

[0334] When the PUCCH and the PUSCH overlap in one or more slots, the terminal transmits only the PUCCH in the overlapping slots and does not transmit the PUSCH in the overlapping slots. Referring to FIG. 44, the PUCCH and the PUSCH may overlap in slot n+2 to slot n+5. In this case, the terminal does not transmit the PUSCH in slot n+2 to slot n+5, and can transmit only the PUCCH. When the PUSCH in the overlapping period is not transmitted, the PUSCH that is not transmitted may not be deferred to the next slot, which makes it difficult to obtain coverage gain by the repeated transmission of the PUSCH. A method for solving this problem will be described below.

[0335] When a PUCCH that is repeatedly transmitted and a PUSCH that is repeatedly transmitted overlap, the terminal may multiplex UCI included in the PUCCH into the PUSCH and transmit the PUSCH. In this case, the overlapping PUCCH does not need to be transmitted. That is, in order to ensure the coverage gain of the PUSCH, the terminal may multiplex UCI included in the PUCCH and transmit the PUSCH without dropping the overlapping PUSCH. Although the HARQ-ACK delay may increase compared to the conventional method in which the PUSCH is dropped, it is efficient in terms of the reliability of the PUSCH and PUCCH since both information (data and UCI) to be transmitted can be transmitted. i) When a PUCCH and a PUSCH overlap, the terminal may multiplex UCI included in the overlapping PUCCH into the PUSCH and transmit the PUSCH. Referring to FIG. 44, the PUCCH and the PUSCH overlap in the period from slot n+2 to slot n+5. Therefore, the terminal may multiplex UCI included in the PUCCH in the period from slot n+2 to slot n+5 into the PUSCH and transmit the PUCCH, and may not transmit the PUCCH. The terminal may subdivide and multiplex UCI by the number of overlapping PUSCHs (number of slots). That is, the terminal may subdivide and multiplex UCI included in the PUCCH into four-slot PUSCHs (slots n+2 to n+5). Alternatively, the terminal may multiplex UCI into one PUSCH without subdividing it. That is, the PUSCH into which UCI is multiplexed may be repeatedly transmitted four times. ii) The terminal may multiplex UCI of the PUCCH into a specific PUSCH when the PUSCH and the PUCCH overlap. In this case, the specific PUSCH may be predefined between the base station and the terminal, or may be configured to the terminal by the base station. a) The specific PUSCH may be the PUSCH that is located earliest in the time domain among the overlapping PUSCHs. For faster HARQ-ACK feedback, the UE may multiplex UCI only into the earliest PUSCH in the time domain. In this case, among the PUSCHs overlapping with the PUCCH, the PUSCHs that are not multiplexed may be transmitted as is.b) The specific PUSCH may be a PUSCH that is located at the front in the time domain among the PUSCHs overlapping with the PUCCH and transmitted in different PRBs in the frequency domain. The terminal may multiplex UCI into the PUSCH that is located at the front in the time domain and transmitted in another PRB for frequency diversity gain for UCI as well as rapid HARQ-ACK feedback. c) The specific PUSCH may be selected based on information set or indicated by the base station. For example, when the base station sets / indicates information of index 1, the terminal may multiplex UCI into a PUSCH with index 1 (i.e., the second PUSCH) among the PUSCHs overlapping with the PUCCH. As yet another example, the base station may set (indicate) information on the start position and length of the PUSCH to the terminal. When the base station sets / indicates to the terminal that the start position is 0 and the length is 2, the terminal may multiplex UCI into the first PUSCH (start position 0) to the second PUSCH (length 2) among the PUSCHs overlapping with the PUCCH.

[0336] Figure 45 shows a PUCCH that is repeatedly transmitted in one embodiment of the present invention, Figure 46 shows a PUCCH that is repeatedly transmitted and intra-slot frequency hopping in one embodiment of the present invention, and Figure 47 shows a PUCCH that is repeatedly transmitted and inter-slot frequency hopping in one embodiment of the present invention.

[0337] 45, since the DMRSs included in PUCCH repetitions #1, #2, #3, and #4 satisfy the above-mentioned conditions for joint channel estimation, the base station can perform channel estimation by combining the DMRSs. In addition, when the PUCCH is repeatedly transmitted for frequency diversity gain, the DMRSs may be transmitted by frequency hopping.

[0338] The types of frequency hopping can be intra-slot frequency hopping and inter-slot frequency hopping.

[0339] - Intra-slot frequency hopping

[0340] The terminal may divide the PUCCH in the slot in which the PUCCH transmission is set into two in the time domain, and map each of the two divided PUCCHs to two hops and transmit them. In this case, the PUCCH may be repeatedly transmitted or not. If the length of the symbol in which the PUCCH is set in one slot is number of symbols, the first hop may be composed of floor(number of symbols / 2) symbols, and the second hop may be composed of number of symbols-floor(number of symbols / 2) symbols. Referring to FIG. 46, the base station may configure the terminal to repeatedly transmit the PUCCH from slot n to slot 4 and perform intra-slot frequency hopping. In this case, the length of the symbol in which the PUCCH is assigned in one slot may be 14. The terminal may configure the first hop with the first seven symbols (floor(number of symbols(14) / 2)) of the PUCCH in each of slots n, n+1, n+2, and n+3, and the second hop may be configured with the next seven symbols (number of symbols(14)-floor(number of symbols(14) / 2)) after the last symbol configuring the first hop. In this case, the first hop may be transmitted in the first frequency band, and the second hop may be transmitted in the second frequency band.

[0341] - Inter-slot frequency hopping

[0342] Based on the first slot of the first PUCCH that is repeatedly transmitted, the slot index for repetition of the slots in which the PUCCH is repeatedly transmitted may be indexed sequentially. In this case, the first slot of the first PUCCH that is repeatedly transmitted may have a repetition slot index of 0. Referring to FIG. 47, the base station may configure the terminal to repeatedly transmit the PUCCH in slots n to 4 and perform inter-slot frequency hopping. In this case, the repetition slot index of slot n may be 0, and the repetition slot indexes of slots n+1, n+2, and n+3 may be 1, 2, and 3, respectively. The terminal may map the PUCCH of the slot in which the even-numbered PUCCH is transmitted (i.e., the slots with the repetition slot indexes 0 and 2) among the PUCCHs that are repeatedly transmitted to the first hop. Similarly, the terminal may map the PUCCH of the slot in which the odd-numbered PUCCH is transmitted (i.e., the slots with the repetition slot indexes 1 and 3) to the second hop. In other words, the terminal may transmit PUCCH in slot n and slot n+2 at the first hop, and transmit PUCCH in slot n+1 and slot n+3 at the second hop.

[0343] The PRB of the first hop may be a PRB that corresponds to the number of PRBs from the PRB of the starting PRB index, and the PRB of the second hop may be a PRB that corresponds to the number of PRBs from the PRB of the second hop PRB index.

[0344] When PUCCH is repeatedly transmitted by frequency hopping, the DMRS of PUCCH transmitted in the first hop and the DMRS of PUCCH transmitted in the second hop are transmitted in different PRBs, and therefore cannot be used for joint channel estimation. Hereinafter, a frequency hopping method for improving coverage by frequency diversity and joint channel estimation of DMRS will be described. For convenience of explanation, the description will be given for PUCCH, but the following content may be equally applied to PUSCH.

[0345] Frequency-Hopping Method for Joint Channel Estimation - Patent application

[0346] 48 to 53 show a method of determining a repetitive transmission slot index when transmitting a PUCCH using frequency hopping according to an embodiment of the present invention.

[0347] Hereinafter, the frequency hopping method for joint channel estimation will be described based on inter-slot frequency hopping. That is, the terminal may map the even-numbered PUCCHs to be repeatedly transmitted to the first hop and transmit them, and the odd-numbered PUCCHs to be repeatedly transmitted to the second hop and transmit them. In this case, the base station configures the terminal to repeatedly transmit the PUCCHs on N slots, and a specific number for configuring the repeated transmission slot indexes can be set as M.

[0348] i) The terminal may maintain the same repeat transmission slot index of the PUCCH repeatedly transmitted in a specific number of slots. The repeat transmission slot index may be sequentially increased for each of the specific number of slots. The specific number may be the number of PUCCHs including DMRS for joint channel estimation. The repeat transmission slot index of M slots may be determined as 0 based on the slot of the first PUCCH repeatedly transmitted. The repeat transmission slot index of the PUCCH repeatedly transmitted thereafter may be sequentially increased for each M slots. In this case, the slot index may be independent of whether the PUCCH is repeatedly transmitted. Referring to FIG. 48, the base station may set N to 4 and M to 2 for the terminal, and may set the terminal to repeatedly transmit the PUCCH starting from slot n. The terminal may determine the repeat transmission slot index of two slots from slot n, i.e., slots n and n+1, as 0, and may determine the repeat transmission slot index of two slots from slot n+2, i.e., slots n+2 and n+3, as 1. The PUCCHs of slot n and slot n+1 with a repeated transmission slot index of 0 may be transmitted at the first hop, and the PUCCHs of slot n+2 and slot n+3 with a repeated transmission slot index of 1 may be transmitted at the second hop. Referring to FIG. 49, the base station may configure the terminal to repeatedly transmit the PUCCH starting from slot n, with N set to 4 and M set to 2. The terminal may determine the repeated transmission slot indexes of slots n and n+1 as 0, the repeated transmission slot indexes of slots n+2 and n+3 as 1, and the repeated transmission slot indexes of slots n+4 and n+5 as 2 based on the M value (2). The slots with a repeated transmission slot index of 0 may be transmitted at the first hop, the slots with a repeated transmission slot index of 1 may be transmitted at the second hop, and the slots with a repeated transmission slot index of 2 may be transmitted at the first hop. However, slot n+1 may be an unavailable slot for PUCCH transmission, and slot n, slot n+2, slot n+3, and slot n+4 may be available slots for PUCCH transmission.Therefore, the terminal must repeatedly transmit PUCCH on four slots, and can transmit PUCCH on four slots available for PUCCH transmission, i.e., slot n, slot n+2, slot n+3, and slot n+4. That is, PUCCH in slots with even repeated transmission slot indexes (slot n and slot n+4) can be transmitted on the first hop, and PUCCH in slots with odd repeated transmission slot indexes (slot n+2 and slot n+3) can be transmitted on the second hop. The terminal can set a repeat slot index for M consecutive slots together, regardless of whether the slots are capable of PUCCH transmission. And, since the M consecutive slots are set with the same repeat slot index, they can be transmitted on the same frequency band. Therefore, if there is a slot in which PUCCH transmission is not possible among the M consecutive slots, the number of slots in which PUCCH is actually transmitted may be smaller than M.

[0349] ii) The terminal may maintain the same repetition transmission slot index in slots where a specific number of PUCCH repetitions are possible. The terminal may sequentially increase the repetition transmission slot index for each slot where a specific number of PUCCH repetitions are possible. The specific number may be the number of PUCCHs including DRMS ​​used for joint channel estimation. Based on the slot of the first PUCCH to be repeatedly transmitted, the repetition transmission slot index of M slots may be determined as 0. The repetition transmission slot index of the PUCCH to be repeatedly transmitted thereafter may be sequentially increased for each M slots. Referring to FIG. 50, the base station may set N to 4 and M to 2 for the terminal, and may set the terminal to repeatedly transmit the PUCCH starting from slot n. In this case, slot n+1 may be an unavailable slot for PUCCH transmission, and slot n, slot n+2, slot n+3, and slot n+4 may be available slots for PUCCH transmission. Based on the M value (2), the terminal may determine the repeated transmission slot indexes of slots n and n+2 to be 0, and the repeated transmission slot indexes of slots n+3 and n+4 to be 1. Thus, the terminal may transmit the PUCCHs of slots n and n+2 with repeated transmission slot indexes of 0 in the first hop, and the PUCCHs of slots n+3 and n+4 with repeated transmission slot indexes of 1 in the second hop.

[0350] For joint channel estimation, PUCCH needs to be transmitted in the same PRB of consecutive slots. For example, referring to FIG. 48, PUCCH set in two consecutive slots, slot n and slot n+1, is transmitted in the first hop, so DMRS included in PUCCH set in slot n and slot n+1 can be used for joint channel estimation. Similarly, PUCCH set in two consecutive slots, slot n+2 and slot n+3, is transmitted in the second hop, so DMRS included in PUCCH set in slot n+2 and slot n+3 can be used for joint channel estimation. Referring to FIG. 49, PUCCH set in two consecutive slots, slot n+2 and slot n+3, is transmitted in the second hop, so DMRS included in PUCCH set in slot n+2 and slot n+3 can be used for joint channel estimation. However, although the PUCCH set to slot n and slot n+4 is transmitted at the first hop, the DMRS included in the PUCCH set to slot n and slot n+4 is not used for joint channel estimation because slot n and slot n+4 are not consecutive in the time domain. Referring to FIG. 50, since the PUCCH set to slot n+3 and slot n+4, which are two consecutive slots, is transmitted at the second hop, the DMRS included in the PUCCH set to slot n+3 and slot n+4 can be used for joint channel estimation. However, although the PUCCH set to slot n and slot n+2 is transmitted at the first hop, the DMRS included in the PUCCH set to slot n and slot n+2 is not used for joint channel estimation because slot n and slot n+2 are not consecutive in the time domain.

[0351] In order for the DMRS to be used for joint channel estimation, the DMRS included in the PUCCH needs to be transmitted in the same hop in consecutive slots.

[0352] Referring to FIG. 51, the base station may set N to 4 and M to 2 for the terminal, and may set the terminal to repeatedly transmit PUCCH starting from slot n. In this case, slot n+1, slot n+2, and slot n+5 may be unavailable slots for PUCCH transmission, and slot n, slot n+3, slot n+4, and slot n+6 may be available slots for PUCCH transmission. The terminal must transmit PUCCH on four slots, and may transmit PUCCH in slot n, slot n+3, slot n+4, and slot n+6. Referring to FIG. 51(a), the repeated transmission slot index may be set according to i) above. The repeated transmission slot indexes of slot n and slot n+1 may be set to 0, the repeated transmission slot indexes of slot n+2 and slot n+3 may be set to 1, the repeated transmission slot indexes of slot n+4 and slot n+5 may be set to 2, and the repeated transmission slot index of slot n+6 may be set to 3. Therefore, the PUCCH set to slot n and slot n+4, whose repetition transmission slot index corresponds to an even number, may be transmitted at the first hop, and the PUCCH set to slot n+3 and slot n+6, whose repetition transmission slot index corresponds to an odd number, may be transmitted at the second hop. Referring to FIG. 51(b), the repetition transmission slot index may be set according to ii) above. The repetition transmission slot indexes of slot n and slot n+3 may be set to 0, and the repetition transmission slot indexes of slot n+4 and slot n+6 may be set to 1. Therefore, the PUCCH set to slot n and slot n+3, whose repetition transmission slot index corresponds to an even number, may be transmitted at the first hop, and the PUCCH set to slot n+4 and slot n+6, whose repetition transmission slot index corresponds to an odd number, may be transmitted at the second hop. According to FIG. 51(a) and (b), the PUCCH set to slot n+3 and slot n+4 may be transmitted at different hops.

[0353] Referring to FIG. 52, the base station can set N to 8 and M to 2 for the terminal, and can set the terminal to repeatedly transmit PUCCH starting from slot n. Slot n+3, slot n+4, and slot n+7 are unavailable slots for PUCCH transmission, and slot n, slot n+1, slot n+2, slot n+5, slot n+6, slot n+8, slot n+9, and slot n+10 are available slots for PUCCH transmission. The terminal must transmit PUCCH on 8 slots, and can transmit PUCCH in slot n, slot n+1, slot n+2, slot n+5, slot n+6, slot n+8, slot n+9, and slot n+10. Referring to FIG. 52(a), the repeated transmission slot index can be set according to i) described above. The repeat transmission slot index of slot n and slot n+1 may be set to 0, the repeat transmission slot index of slot n+2 and slot n+3 may be set to 1, the repeat transmission slot index of slot n+4 and slot n+5 may be set to 2, the repeat transmission slot index of slot n+6 and slot n+7 may be set to 3, the repeat transmission slot index of slot n+8 and slot n+9 may be set to 4, and the repeat transmission slot index of slot n+10 may be set to 5. Therefore, PUCCHs set to slot n, slot n+1, slot n+5, slot n+8, and slot n+9, whose repeat transmission slot indexes correspond to even numbers, may be transmitted at the first hop, and PUCCHs set to slot n+2, slot n+6, and slot n+10, whose repeat transmission slot indexes correspond to odd numbers, may be transmitted at the second hop. Referring to FIG. 52(b), the repeat transmission slot index may be set according to ii) described above. The repeat transmission slot index of slot n and slot n+1 may be set to 0, the repeat transmission slot index of slot n+2 and slot n+5 may be set to 1, the repeat transmission slot index of slot n+6 and slot n+8 may be set to 2, and the repeat transmission slot index of slot n+9 and slot n+10 may be set to 3.Therefore, the PUCCHs set in slot n, slot n+1, slot n+6, and slot n+8, which have even-numbered repetition slot indexes, may be transmitted in the first hop, and the PUCCHs set in slot n+2, slot n+5, slot n+9, and slot n+10, which have odd-numbered repetition slot indexes, may be transmitted in the second hop. Referring to FIG. 52, the PUCCHs set in consecutive slots, slot n+5 and slot n+6, may be transmitted in different hops. According to FIG. 51 and FIG. 52, even if the PUCCHs are set in consecutive slots, the repetition slot indexes are set to be different and transmitted in different hops, so that the DMRSs included in the PUCCHs set in consecutive slots cannot be used for joint channel estimation. Hereinafter, a method for using the DRMSs included in the PUCCHs set in consecutive slots for joint channel estimation will be described.

[0354] iii) The terminal may set the same repetitive transmission slot index to slots capable of joint channel estimation among a specific number of slots capable of transmitting the PUCCH repeatedly. The slots capable of joint channel estimation may be consecutive slots in the time domain among slots capable of transmitting the PUCCH repeatedly. The specific number may be the number of PUCCHs including DMRS used for joint channel estimation. The terminal may set the same repetitive transmission slot index to M consecutive slots among slots available for PUCCH transmission. The repetitive transmission slot index of consecutive slots among slots available for PUCCH transmission may be sequentially increased every M slots. In this case, when the number of consecutive slots is less than M, the same repetitive transmission slot index may be set to consecutive slots less than M. The non-consecutive slots may be set to different repetitive transmission indexes. The repetitive transmission slot indexes of the first slot and the last slot among the non-consecutive slots may be indexed sequentially. The repeat transmission slot index of the slot in which the first PUCCH to be repeatedly transmitted set (instructed) by the base station is set is 0, and if there are M slots consecutive to the slot in which the first PUCCH is set, the repeat transmission slot index of the M slots may be 0. Thereafter, the repeat transmission slot index of M slots consecutive from the slot in which the PUCCH can be transmitted may be 1. On the other hand, if there are not M consecutive slots, that is, if there are discontinuous slots, the terminal can obtain the consecutive slots after the discontinuous slot. For example, if the repeat transmission slot index of the slot before the discontinuous slot is X, the repeat transmission slot index of the first slot of the consecutive slots after the discontinuous slot may be X+1. Similarly, the repeat transmission slot index of M consecutive slots including the first slot of the consecutive slots after the discontinuous slots may be X+1. Referring to FIG. 53(a), the terminal can set the same repeat transmission slot index to consecutive slots in which the PUCCH can be transmitted, grouped by two (M=2).Since slot n+1 and slot n+2 are unavailable for PUCCH transmission, there is no slot used for PUCCH transmission subsequent to slot n. Therefore, only slot n may be set to a repeated transmission slot index of 0. The repeated transmission slot index of slot n+3, which is a slot used for the first PUCCH transmission after slot n, may be set to 1. Since slot n+4, which is a slot subsequent to slot n+3, is consecutive, the repeated transmission slot indexes of slot n+3 and slot n+4 may be set to the same. The repeated transmission slot index of slot n+6, which is a slot used for PUCCH transmission after slot n+4, may be set to 2 (since slot n+5 is unavailable for PUCCH transmission). Therefore, the terminal transmits PUCCHs set to slot n and slot n+6, whose repeated transmission slot indexes correspond to even numbers, in the first hop, and transmits PUCCHs set to slot n+3 and slot n+4, whose repeated transmission slot indexes correspond to odd numbers, in the second hop. Compared with the description in FIG. 51, since the PUCCHs set in slot n+3 and slot n+4 are transmitted on the same hop, the DMRSs set in the PUCCHs can be used for joint channel estimation. Referring to FIG. 53(b), the terminal can set the repeat transmission slot index of the first PUCCH to be repeatedly transmitted to 0, and set the repeat transmission slot index of slot n+1, which is consecutive to slot n, among the slots available for PUCCH transmission, to 0. The repeat transmission slot index of slot n+2, which is the earliest slot available for PUCCH transmission after slot n+1, can be set to 1. There is no slot available for PUCCH transmission consecutive to slot n+2 (slot n+3 and slot n+4 are unavailable for PUCCH transmission). Therefore, the repeat transmission slot index of slot n+5, which is the earliest slot available for PUCCH transmission after slot n+2, can be set to 2. And the repeat transmission slot index of slot n+6, which is adjacent to slot n+5, can be indexed the same as slot n+5.

[0355] 54 to 59 show a method of mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention.

[0356] iv) The base station can set (instruct) to the terminal a period and an offset of a time window for frequency hopping. The terminal can apply the period and offset to a slot in which repeated transmission of PUCCH is set, and can map and transmit PUCCHs within the period to the same hop. In this case, the base station can set (instruct) the period and offset regardless of repeated transmission of PUCCH. Referring to FIG. 54, the base station can set N to 4 or 8 in a cell with a subcarrier spacing of 15 kHz, and can set the period to 2 ms and the offset to 0 ms regardless of the value of N. Thus, the terminal can map and transmit two PUCCHs to one hop in both cases where N is 4 or 8. Meanwhile, the base station can set (instruct) to the terminal different period and offset depending on the number of repeated transmissions of PUCCH. Referring to FIG. 55, the base station can set to the terminal a period of 2 ms and an offset of 0 ms if N is 4 in a cell with a subcarrier spacing of 15 kHz, and can set to 4 ms and an offset of 0 ms if N is 8. Therefore, if N is 4, the terminal can map two PUCCHs that are repeatedly transmitted to one hop for transmission, and if N is 8, the terminal can map four PUCCHs that are repeatedly transmitted to one hop for transmission.

[0357] The number of slots (N) in which the PUCCH is repeatedly transmitted and the number of slots (or a specific number for determining a repeated transmission slot index) (M) included in one hop may be explicitly set by the base station or may be implicitly set. The following describes in more detail how to set N and M.

[0358] How to set N and M

[0359] i) The terminal can map the PUCCH repeatedly transmitted in a previously set number of slots to the same frequency hop and transmit it. In this case, M can be set regardless of the number of times of repeated transmission of the PUCCH. Referring to FIG. 56, when the number of repeated transmissions (N) of the PUCCH is set to 2, 4, or 8 in the terminal, M can be set to 2 regardless of the number of times of repeated transmission. In other words, the terminal can map two slots of the PUCCH repeatedly transmitted to one hop and transmit it regardless of the number of times of repeated transmission.

[0360] ii) The terminal may map the PUCCH repeatedly transmitted in the previously set number of slots to the same frequency hop and transmit it. In this case, M may be set differently depending on the number of times the PUCCH is repeatedly transmitted. In this case, M may be set as a function of N. Thus, the PUCCH repeatedly transmitted can be subjected to flexible frequency hopping depending on the number of times the PUCCH is repeatedly transmitted. Referring to FIG. 57, if N is 2, M may be set to 1, if N is 4, M may be set to 2, and if N is 8, M may be set to 4. That is, if N is 2, one slot may be mapped to one hop, if N is 4, two slots may be mapped to one hop, and if N is 8, four slots may be mapped to one hop.

[0361] Hereinafter, a method in which a terminal repeatedly transmits a PUCCH using frequency hopping without a separate setting for M from a base station will be described.

[0362] iii) The terminal may perform repeated transmission of PUCCH using frequency hopping based on the number of hops. The terminal may determine how many hops to map and transmit N PUCCHs to be repeatedly transmitted, and may determine PUCCHs to be mapped to each hop. In this case, the number of hops may refer to the number of PUCCHs that satisfy the condition for joint channel estimation. Referring to FIG. 54, when N is 8, there may be a total of four hops, including the first hop (repetition #1, repetition #2), the second hop (repetition #3, repetition #4), the third hop (repetition #5, repetition #6), and the fourth hop #4 (repetition #7, repetition #8).

[0363] iii-a) The base station can set the number of hops in the terminal, and the terminal can perform repeated transmission of PUCCH using frequency hopping based on the set number of hops. Specifically, the terminal can map N PUCCHs to be repeatedly transmitted to K hops and transmit them. For example, the terminal can map floor(N / K) PUCCHs to the 1st hop to the (K-1)th hop in ascending order, and map ceil(N / K) PUCCHs to the Kth hop in ascending order and transmit them. Referring to FIG. 58, when the number of repeated transmissions (N) of PUCCH is 8 and the number of hops (K) is set to 4, the terminal can map 2(floor(8 / 4)) PUCCHs to frequency hops #1, #2, #3, and map 2(ceil(8 / 4)) PUCCHs to frequency hop #4 and transmit them. That is, the terminal maps repetition #1 and repetition #2 to hop #1, repetition #3 and repetition #4 to hop #2, repetition #5 and repetition #6 to hop #3, and repetition #7 and repetition #8 to hop #4, and transmits them. According to yet another embodiment, the terminal can map ceil(N / K) PUCCH repetitions in ascending order to the first hop, and floor(N / K) PUCCH repetitions in ascending order to the second to Kth hops, and transmit them.

[0364] iii-b) The terminal can map the PUCCHs that are repeatedly transmitted to the same number of hops without setting the number of hops from the base station and transmit them using frequency hopping. By using iii-b), when frequency hopping and joint channel estimation are both applied, the PUCCHs that are repeatedly transmitted as many as possible can be distributed to equal frequency hops and transmitted. The terminal can always transmit N PUCCHs that are repeatedly transmitted to two hops. floor(N / 2) PUCCHs may be mapped to the first hop in ascending order, and N-floor(N / 2) PUCCHs may be mapped to the second hop in ascending order. Referring to FIG. 59, when the number of repetitive transmissions (N) of PUCCHs is 8, the terminal can map 4 (floor(8 / 2)) PUCCHs to hop #1 and 4 (ceil(8 / 2)) PUCCHs to hop #2 and transmit them. That is, repetition #1, repetition #2, repetition #3, and repetition #4 may be mapped to hop #1, and repetition #5, repetition #6, repetition #7, and repetition #8 may be mapped to hop #2. As yet another example, the terminal may map ceil(N / 2) PUCCHs in ascending order to the first hop and floor(N / 2) PUCCHs in ascending order to the second hop for transmission.

[0365] FIG. 60 shows scheduling of one physical uplink shared channel according to one embodiment of the present invention.

[0366] A PUSCH including a DMRS for which joint channel estimation is possible may be a PUSCH including one transmission block. A transmission block size (TB size, TBS) may be determined based on one slot or multiple slots. Referring to FIG. 60, a terminal may determine two slots, slot n and slot n+1, in which PUSCH#1 is set, as one TBS. In this case, although the DMRSs are included in different slots, they may be used for joint channel estimation if they satisfy the above-mentioned joint channel estimation condition.

[0367] FIG. 61 illustrates scheduling of multiple physical uplink shared channels according to one embodiment of the present invention.

[0368] a) A PUSCH including a DMRS capable of joint channel estimation may be a PUSCH including one transmission block and repeatedly transmitted. A transmission block size is determined based on one slot, and a PUSCH may be repeatedly transmitted on multiple slots. For example, a terminal may transmit PUSCH repetition 1 in slot n and PUSCH repetition 2 in slot n+1. In this case, the DMRS is transmitted in different slots (slot n or slot n+1), but may be used for joint channel estimation if the above-mentioned joint channel estimation condition is satisfied. b) Meanwhile, a PUSCH may be a PUSCH including different transmission blocks. In this case, the PUSCH may be scheduled or activated by different DCIs. Or, the PUSCH may be a PUSCH including different transmission blocks scheduled or activated by one DCI. For example, referring to FIG. 61, a terminal may be configured by a base station to transmit PUSCH#1 in slot n and PUSCH#2 in slot n+1. In this case, PUSCH#1 and PUSCH#2 may be scheduled with different DCIs. The DMRSs included in PUSCH#1 and PUSCH#2 are transmitted in different slots (slot n or slot n+1), and may be used for joint channel estimation if the above-mentioned joint channel estimation condition is satisfied.

[0369] The base station may set a time domain interval (time domain window or bundling window) for joint channel estimation in the terminal. In this case, the base station may set the time domain interval so that the DMRS included in the uplink channel (PUCCH or PUSCH) transmitted in the specific time domain interval satisfies the above-mentioned joint channel estimation condition. The above-mentioned PUCCH or PUSCH may be repeatedly transmitted within the time domain interval. In this case, the PUCCH or PUSCH may include one transmission block or may include different transmission blocks. In this case, the time domain interval may be explicitly set or implicitly set by the base station. A method of determining the time domain interval will be described below.

[0370] How to determine the time domain interval

[0371] FIG. 62 illustrates a method for determining a time domain window in accordance with one embodiment of the present invention.

[0372] i) The base station explicitly transmits information on the time domain interval to the terminal, and the terminal can determine the time domain interval based on the transmitted information on the time domain interval. In this case, the information on the time domain interval may be information on the length of the time domain interval, and specifically, may include at least one of information on the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel. The terminal can transmit the PUCCH or PUSCH so as to satisfy a joint channel estimation condition in the time domain interval set by the base station. When the terminal receives information on the time domain interval from the base station, the terminal must determine the time when the time domain interval begins.

[0373] ia) The time point when the time domain interval starts may be the first symbol of the first slot of radio frame index 0. For example, if the length of the time domain interval is 5 slots, the time domain interval may be determined in groups of 5 slots starting from the first slot of radio frame index 0. In this case, the index of the first slot of radio frame index 0 may be 0.

[0374] ib) The time domain interval may start at the first uplink symbol of the first uplink slot of radio frame index 0. The uplink slot means a slot consisting of only uplink symbols. For example, if the length of the time domain interval is 5 slots, the time domain interval may be determined by grouping 5 slots starting from the first uplink slot of radio frame index 0.

[0375] ic) The time domain interval may start at the first non-downlink symbol of the first non-downlink slot of radio frame index 0. The non-downlink slot may be a slot including at least one non-downlink symbol. The non-downlink symbol is a symbol that is not a downlink symbol and may be an uplink symbol or a flexible symbol. For example, if the length of the time domain interval is 5 slots, the time domain interval may be determined by grouping 5 slots starting from the first non-downlink slot of radio frame index 0.

[0376] id) The terminal may be configured with an offset value for determining a time point when the time domain interval starts from the base station. The offset value may be at least one of the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel. For example, if the offset value is X slots or X symbols or X repetitions, the time domain interval may be configured by collecting only the length corresponding to X slots or X symbols or X repetitions. In this case, the value of X may be a value smaller than the length of the time domain interval.

[0377] A base station can set information (length-related information) on a plurality of time domain intervals to a terminal. Referring to FIG. 62, when a base station sets a TDD configuration to a terminal, two patterns can be set. In this case, a different period can be set for each of the two patterns. If a period of a first pattern is P1 and a period of a second pattern is P2, P1+P2 can be one value among divisors of 20. Each pattern can include a DL symbol, a UL symbol, and a flexible symbol, and can be configured in the order of a DL symbol, a flexible symbol, and a UL symbol. Referring to FIG. 62, a base station can set P1 to 2 ms, P2 to 3 ms, and set a subcarrier interval to 30 KHz. In this case, the base station can set a plurality of patterns constituting a time domain to a terminal. In this case, if only one time domain interval is set for a plurality of patterns, the set one time domain interval may not match the plurality of patterns. Therefore, a base station can set a plurality of time domain intervals corresponding to each of a plurality of patterns to a terminal. Specifically, the base station can set a time domain interval consisting of a first pattern and a time domain interval consisting of a second pattern, i.e., two time domain intervals, to the terminal. In this case, the length of the first time domain interval can be set to X1 slots, X1 symbols, and X1 repetitions, and the length of the second time domain interval can be set to X2 slots, X2 symbols, and X2 repetitions. The terminal can set a time domain interval #0 based on X1 slots or X1 symbols or X1 repetitions from the start of the time domain interval, and can set a time domain interval #1 based on X2 slots or X2 symbols or X2 repetitions. That is, a plurality of time domain intervals having different lengths can be set. In this case, the values ​​of X1 and X2 can be values ​​set by the base station to the terminal. Meanwhile, the base station does not explicitly indicate which time domain interval the values ​​of X1 and X2 are, and the terminal can infer them. That is, X1 may correspond to a period P1, and X2 may correspond to a period P2.The first pattern and the second pattern may each be a time domain interval, and thus the DMRS included in the slots constituting the first pattern may be used for joint channel estimation, and the DMRS included in the slots constituting the second pattern may be used for joint channel estimation.

[0378] ii) The terminal can determine the time domain interval without receiving explicit information on the time domain interval from the base station, that is, when the terminal does not receive explicit information on the time domain interval from the base station, the terminal can implicitly determine a specific interval as the time domain interval.

[0379] ii-a) The terminal may implicitly determine the time domain interval based on the number of times of repeated transmission of the PUCCH or PUSCH. That is, the terminal may determine the time domain interval from the start of repeated transmission of the PUCCH or PUSCH to the end of repeated transmission. In other words, since the repeatedly transmitted PUCCH or PUSCH is transmitted within the same time domain interval, the DMRS included in the PUCCH or PUSCH at this time may be used for joint channel estimation.

[0380] ii-b) The terminal can implicitly determine the time domain interval based on the slot configuration, i.e., the terminal can determine the time domain interval by the slot configuration in the unpaired spectrum.

[0381] ii-c) The terminal can implicitly determine the time domain interval based on consecutive uplink slots.

[0382] ii-d) The terminal can implicitly determine the time domain interval based on consecutive non-downlink slots.

[0383] One or more slots or symbols may be included between resource regions (e.g., slots) in which repeated transmission of an uplink channel is set. Specifically, one or more slots or symbols may be included between a resource region in which a first PUSCH / PUCCH to be repeatedly transmitted is set and a resource region in which a second PUSCH / PUCCH to be repeatedly transmitted is set. In this case, the one or more slots or symbols may be up to X slots or symbols. In this case, X may be a value set by the base station. The one or more slots or symbols may be resources not used for transmitting an uplink channel. That is, a certain interval (gap) may exist between resource regions in which the uplink channels to be repeatedly transmitted are set. In other words, a time domain interval may be determined based on a certain interval existing between resource regions in which the uplink channels to be repeatedly transmitted are set.

[0384] When a terminal determines a time domain interval based on consecutive uplink slots or non-downlink slots, a large number of slots constituting one time domain interval may be disadvantageous in terms of complexity of the terminal or base station. Therefore, one time domain interval may be divided into a number of sub-time domain intervals. In this case, the DMRS included in the PUSCH or PUCCH transmitted on the sub-time domain interval is available for joint channel estimation.

[0385] Method for determining sub-time domain intervals

[0386] i) One time domain interval may be divided based on the length of the sub-time domain interval. The base station may transmit length information for the sub-time domain interval to the terminal, and the terminal may divide the time domain interval into a plurality of sub-time domain intervals based on the received length information. In this case, the length information may be at least one of the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel. Specifically, if the length of the time domain interval is N (N slots / symbols / repetitions) and the length of the sub-time domain interval is M (M slots / symbols / repetitions), the terminal may determine the 1st slot / symbol / repetition to the Mth slot / symbol / repetition as the 1st sub-time domain interval. Then, the terminal may determine the M+1th slot / symbol / repetition to the 2Mth slot / symbol / repetition as the 2nd sub-time domain interval. In this case, the slot / symbol / repetition included in the last sub-time domain interval may be smaller than M. Similarly, the terminal may determine the k*M+1th slot / symbol / repetition to the remaining (Nth) slot / repetition / symbol as the Mth sub-time domain interval. In this case, the number of slot / symbol repetitions included in the Mth sub-time domain interval may be less than M. In this case, k may be calculated as floor(N / M).

[0387] ii) The time domain interval may be divided based on the number of sub-time domain intervals. That is, the terminal receives information regarding the number of sub-time domain intervals from the base station, and the terminal may divide the time domain interval into the number of sub-time domain intervals. For example, if the time domain interval is N (N slots / symbols / repetitions) and the number of sub-time domain intervals is M, the number of slots / symbols / repetitions included in one sub-time domain interval may be ceil(N / M) or floor(N / M). Specifically, N mod M sub-time domain intervals may include ceil(N / M) slots / symbols / repetitions, and M-(N mod M) sub-time domain intervals may include floor(N / M) slots / symbols / repetitions. As yet another example, the number of slots / symbols / repetitions included in M-1 sub-time domain intervals may be floor(N / M), and the number of slots / symbols / repetitions included in one sub-time domain interval may be N-(M-1)*floor(N / M). In this case, A mod B means the remainder when A is divided by B.

[0388] When the terminal determines a time domain interval based on consecutive uplink slots, it may determine which time domain interval the uplink slot is included in. At this time, it is necessary to determine which time domain interval a slot that is not an uplink slot but is capable of uplink transmission is included in. Specifically, it is necessary to determine which time domain interval a non-downlink slot is included in. A non-downlink slot may be included in a time domain interval of an adjacent uplink slot. For example, if slot n is a non-downlink slot and slot n+1 is an uplink slot, slot n may be included in the time domain interval including slot n+1.

[0389] In the NR system, various subcarrier spacings may be set, and the symbols / slots / repetitions for determining the above-mentioned (sub) time domain intervals may vary depending on the subcarrier spacing. Therefore, the subcarrier spacing for determining the (sub) time domain interval needs to be determined, and in this specification, the subcarrier spacing that can be referred to for determining the time domain interval is referred to as the reference subcarrier spacing.

[0390] Method for determining reference subcarrier spacing

[0391] i) When the base station configures the terminal with TDD, the base station can also configure information about the subcarrier spacing. That is, the terminal can use the subcarrier spacing configured with the base station when configuring TDD as a reference subcarrier spacing that can be referred to in determining the time domain section.

[0392] ii) When the base station configures one or more UL BWPs of a cell in a terminal, the base station can configure subcarrier spacings of one or more UL BWPs. When the terminal determines a time domain interval, the terminal can use one value of one or more subcarrier spacings as a reference subcarrier spacing. For example, when multiple subcarrier spacings are configured, the smallest subcarrier spacing can be the reference subcarrier spacing.

[0393] iii) When one UL BWP of each cell is activated, the terminal may use the subcarrier spacing of the activated UL BWP as a reference subcarrier spacing.

[0394] iv) The terminal can use any subcarrier spacing as the reference subcarrier spacing. The any subcarrier spacing may be determined differently for each frequency range (FR). The any subcarrier spacing may be one of the subcarrier spacings available in each FR, and may be the lowest subcarrier spacing. For example, in FR1, subcarrier spacings of 15 kHz, 30 kHz, and 60 kHz are possible, so the reference subcarrier spacing may be 15 KHz. In FR2, subcarrier spacings of 60 kHz and 120 kHz are possible, so the reference subcarrier spacing may be 60 KHz.

[0395] v) The base station may set a reference subcarrier spacing of the cell to the terminal. In this case, the reference subcarrier spacing may not be larger than the subcarrier spacing set in the UL BWP.

[0396] In the following, a method in which a terminal independently determines a time domain interval and transmits information about the determined time domain interval to a base station will be described.

[0397] Method for determining a unique time domain interval for a terminal

[0398] i) The terminal can transmit information on the start or end of a time domain section to the base station. For example, the terminal can inform the base station of information on the start or end of a time domain section with a 1-bit value. For example, the terminal can indicate the start or end of a time domain section with "0" and indicate sections other than the start with "1". Specifically, if the resource region in which the PUCCH or PUSCH in the time domain section is transmitted is slot n to slot n+3, the PUCCH or PUSCH transmitted in slot n can indicate "0" with a 1-bit value, and the PUCCH or PUSCH transmitted in slot n+1, slot n+2, and slot n+3 can indicate "1" with a 1-bit value. In this case, the indicated values ​​"0" and "1" may be interchangeable. The 1-bit value may be multiplexed into the PUSCH, and may be multiplexed into the PUSCH in the same manner as the HARQ-ACK.

[0399] ii) When the time domain interval is changed, the terminal can transmit information about the time domain interval to the base station using toggling. For example, if the terminal transmits a 1-bit value of the PUSCH or PUCCH transmitted in the first time domain interval as '0', the terminal can transmit a 1-bit value of the PUSCH or PUCCH transmitted in the second time domain interval as '1'.

[0400] 63 to 66 show a method for indicating a time domain interval according to an embodiment of the present invention.

[0401] If the base station cannot receive the PUSCH or PUCCH in the time domain interval specified by the terminal, ambiguity may occur between the terminal and the base station regarding the time domain interval. Referring to FIG. 63(a), the terminal can transmit information regarding the time domain interval to the base station using the terminal's own interpretation method i). For example, the terminal can inform the base station that slot 0 to slot 3 is one time domain interval, and slot 4 to slot 5 is another time domain interval. In this case, if the base station fails to receive the PUCCH or PUSCH in slot 3 and slot 4, the base station may determine slot 0 to slot 5 as one time domain interval and perform joint channel estimation. Referring to FIG. 63(b), the terminal can transmit information regarding the time domain interval to the base station using the terminal's own interpretation method ii). For example, the terminal can inform the base station that slot 0 to slot 2 is one time domain interval, slot 3 and slot 4 are another time domain interval, and slot 5 is yet another time domain interval. In this case, if the base station fails to receive the PUCCH or PUSCH in slot 3 and slot 4, the base station may determine slot 0 to slot 5 as one time domain interval and perform joint channel estimation. In this case, since the PUCCH or PUSCH transmitted by the terminal does not satisfy the joint channel estimation condition, the base station may fail to estimate the channel, and thus the coverage performance cannot be improved. Therefore, a method for reducing the ambiguity regarding the time domain interval between the terminal and the base station is required.

[0402] Ambiguity Resolution Method for Time Domain Intervals

[0403] i) The terminal may transmit a counter indicator to the base station as information on the time domain section. That is, the terminal may transmit information on which symbol set in one time domain section is. In this case, the symbol set may include a slot, a symbol, and repeated transmission of an uplink channel. Referring to FIG. 64(a), the terminal may indicate to the base station that joint channel estimation is possible using uplink DMRS transmitted in slot 0 to slot 3, and that joint channel estimation is possible using uplink DMRS transmitted in slot 4 and slot 5. In this case, the terminal may indicate the start slot in which joint channel estimation is possible as 0 using the counter indicator, and the subsequent slots may be indicated by counter values ​​of 1, 2, ... 3 in ascending order. Referring to FIG. 64(b), the terminal may indicate the start slot in which joint channel estimation is possible as 0 using the counter indicator, and the subsequent slots may be indicated by counter values ​​in ascending order. Therefore, in Figures 64(a) and 64(b), even if the base station cannot decode the uplink transmissions in slots 3 and 4, it can be seen from the counter indicator that the uplink transmissions in slots 2 and 5 cannot be jointly estimated with each other, because the counter indicator value of slot 2 and the counter indicator value of slot 5 do not satisfy the ascending order.

[0404] ia) The terminal may transmit information on a total indicator in addition to a counter indicator as information for joint channel estimation to the base station. In this case, the total indicator may indicate a symbol set included in one time interval domain. The symbol set may include a slot, a symbol, and repeated transmission. Referring to FIG. 65(b), the base station may fail to receive the uplink channel transmitted in slot 2 and slot 3. In this case, if only the counter indicator exists as information for joint channel estimation, ambiguity regarding the time domain interval may occur between the base station and the terminal. Therefore, the terminal can reduce ambiguity regarding the time domain interval by notifying the base station of the total indicator in addition to the counter indicator. In FIG. 65(b) for each slot, a is a value indicated by the counter indicator, and b is a value indicated by the total indicator. That is, in slot 0, the counter indicator indicates 0, and the value indicated by the total indicator is 2. Since slot 0 and slot 1 are one time domain window consisting of two symbol sets, the overall indicator values ​​for slot 0 and slot 1 are the same.

[0405] ii) The terminal can transmit information on the index of the time domain section to the base station. One time domain section is set to the same index, and other time domain sections are set to sequentially incremented indexes, so that the terminal can inform the base station that they are different time domain sections. Referring to FIG. 66, the terminal can inform the base station that it is an uplink channel transmission in the same time domain section using the same index, and can inform the base station that it is an uplink channel transmission in another time domain section using an incremented index. This has the effect that when the base station fails to receive the uplink channel transmitted in slot 3 and slot 4 described in FIG. 66(b), the base station can recognize it and request the terminal to retransmit the uplink channel. That is, since the indexes of slot 0 to slot 2 and the index of slot 5 are different from each other, the base station can recognize that slot 0 to slot 2 and slot 5 are included in different time domain sections.

[0406] In the following, a method for determining a time domain interval when multiple uplink cells are configured in a terminal will be described.

[0407] 67 and 68 illustrate a method for determining a time domain window in a carrier aggregation situation according to one embodiment of the present invention.

[0408] A plurality of uplink cells may be configured for the terminal by the base station. The configuration of a plurality of uplink cells may be referred to as uplink carrier aggregation. In this case, the first cell configured for the terminal may be a PCell (primary cell), and a cell configured in addition to the PCell may be a SCell (secondary cell). The terminal may transmit an uplink channel through the configured PCell or SCell. The uplink physical channel may be at least one of a PUSCH or a PUCCH. When transmitting an uplink channel in a plurality of cells configured in the same frequency band, the terminal may share transmission power. When a plurality of uplink cells are configured for the terminal, they may be configured to satisfy the above-mentioned joint channel estimation condition. When uplink carrier aggregation is configured, if one time domain section is configured for the terminal, there is a problem in determining a time domain section to be applied to a plurality of cells. In this case, the one configured time domain section may be a time domain section configured based on the PCell. When different TDD configurations are configured for each cell, the time domain interval set with reference to the PCell may be an interval that is not suitable for joint channel estimation for the uplink channel transmitted on the SCell. Referring to FIG. 67, two uplink cells, cell#0 and cell#1, are configured in the terminal, and different TDD configurations may be configured for each cell. The time domain interval is set with reference to cell#0, and the time domain interval may be set every 5 slots from the first slot in the frame. The number of consecutive uplink slots in cell#1 is 6, but the time domain interval is set every 5 slots, so the time domain interval set with reference to cell#0 may not be suitable for cell#1.

[0409] The base station may set different subcarrier spacings for multiple uplink cells. In this case, the subcarrier spacing may be the subcarrier spacing for the TDD configuration or the subcarrier spacing for the BWP configuration. In a carrier aggregation situation, if the subcarrier spacing for the TDD configuration of the SCell is smaller than the subcarrier spacing for the TDD configuration of the PCell, the boundary of the time domain configuration determined with reference to the PCell may not be set accurately. Referring to FIG. 68, the subcarrier spacing for the TDD configuration may be set to 30 KHz for cell #0 and 15 kHz for cell #1. The time domain interval for joint channel estimation is determined with reference to cell #0 and may be set every 5 slots or every 2.5 ms from the first slot in the radio frame. In this case, the same time domain interval may be applied to cell #1. However, the boundary of the time domain interval may be located within the third uplink slot of cell #1. Therefore, some symbols of the third uplink slot of cell #1 may be included in the first time domain interval, and the remaining symbols may be included in the second time domain interval. That is, if the subcarrier spacing for the TDD configuration of the SCell is smaller than the subcarrier spacing for the TDD configuration of the PCell, the time domain interval may not be compatible. Therefore, a time domain interval that can be adapted to all uplink cells in a carrier aggregation situation is required.

[0410] Method for determining time domain intervals in carrier aggregation situations - Patents.com

[0411] 69 to 74 show a method of setting a time domain section according to an embodiment of the present invention.

[0412] i) In a carrier aggregation situation, the base station can configure a separate time domain section for each of a plurality of cells. That is, when N uplink cells including the PCell are configured in the terminal, the base station can configure a time domain section to be applied to each of the N cells. Referring to FIG. 69, cell#0 with a subcarrier spacing of 30 KHz and cell#1 with a subcarrier spacing of 15 KHz may be configured in the terminal. Time domain window#0 and time domain window#1 may be configured for each of cell#0 and cell#1. Time domain window#0 may be configured with two slots of 1 ms, and time domain window#1 may be configured with two slots of 2 ms. In this case, in order to reduce signaling overhead, when the base station configures a time domain section for each cell, it can use a specific parameter that is commonly applied to each cell.

[0413] ia) A reference subcarrier spacing may be used commonly for each cell. That is, the base station may set only a reference subcarrier spacing for one time domain interval to the terminal. Or, the terminal may implicitly infer a reference subcarrier spacing for one time domain interval. In this case, the reference subcarrier spacing may be applied to all cells. The terminal may obtain a subcarrier spacing for a time domain window of each cell. For example, the terminal may select any one of the obtained subcarrier spacings of each cell and apply the selected any one of the subcarrier spacings to the time domain intervals of all cells. In this case, the any one of the subcarrier spacings may be the lowest subcarrier spacing among the subcarrier spacings of each cell. As yet another example, the terminal may apply a subcarrier spacing for a time domain interval of Pcell among each cell to the time domain intervals of all cells. As yet another example, the terminal may apply a subcarrier spacing for a time domain window of a cell having a lowest index among each cell to the time domain intervals of all cells. As another example, the UE may be configured with a reference subcarrier spacing applied to the time domain interval of all cells from the base station, where the reference subcarrier spacing applied to the time domain interval of all cells configured in the UE must not be greater than the subcarrier spacing configured in the UL BWP of all cells.

[0414] ii) The base station may set a length of a time domain section commonly applied to all cells. In this case, the length of the time domain section may be described as a length of a cell common time domain section. The length of the cell common time domain section may be adjusted according to a reference subcarrier spacing and a subcarrier spacing of cells. That is, when the length of the cell common time domain section is M slots / symbols / repetitions, the length of the time domain section applied to a cell may be f(M*(SCS_cell / SCS_refer)) slots / symbols / repetitions. SCS_refer is a reference subcarrier spacing, and SCS_cell is a subcarrier spacing of an applied cell. f(x) may be at least one of ceil(x), floor(x), and round(x). Referring to FIG. 70, a subcarrier spacing of 30 kHz may be set for cell#0, and a subcarrier spacing of 15 kHz may be set for cell#1. In this case, the reference subcarrier spacing may be set to 15 KHz. The length of the cell common time domain section may be set to 5 slots. The length of the time domain interval applied to cell#0 may be determined to be 10 (f(5*(30kHz / 15kHz))) slots / symbols / repetitions, and the length of the time domain interval applied to cell#1 may be determined to be 5 (f(5*(15kHz / 15kHz))) slots / symbols / repetitions. Referring to FIG. 71, for example, cell#0 may be set to a subcarrier spacing of 30kHz, and cell#1 may be set to a subcarrier spacing of 15kHz. The reference subcarrier spacing may be set to 30kHz. The cell common time domain interval may be set to 5 slots. In this case, if f(x) is ceil(x), the length of the time domain interval applied to cell#0 may be determined to be 5 (ceil(5*(30kHz / 30kHz))) slots / symbols / repetitions, and the length of the time domain interval applied to cell#1 may be determined to be 3 (ceil(5*(15kHz / 30kHz))) slots / symbols / repetitions.

[0415] ii-a) The UE may select one reference cell from among a plurality of uplink cells, and may apply a time domain duration determined based on the selected reference cell to all cells. The method of determining the reference cell is as follows.

[0416] - PCell: The reference cell may be a PCell, that is, the UE may extend the time domain duration determined based on the PCell to fit the SCell.

[0417] - The lowest cell index: The reference cell may be a cell with the lowest cell index. The lowest cell index may be 0. That is, the PCell may be the reference cell. Meanwhile, the lowest cell index may be 1 or more. That is, the cell with the lowest cell index among the SCells excluding the PCell may be the reference cell.

[0418] - The lowest SCS: The reference cell may be the cell configured with the lowest subcarrier spacing. As described with reference to FIG. 68, this is to prevent the boundary of the time domain section from being included in the slot of a different cell. In th...

Claims

1. A method for transmitting an uplink channel in a wireless communication system, the method being performed by a terminal, comprising: receiving, from a base station, first information related to a Time Division Duplex (TDD) configuration, the first information including information related to a type of a symbol constituting a slot, the type of the symbol being any one of a downlink symbol set as available for downlink transmission, an uplink symbol set as available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol; the base station repeatedly transmitting an uplink channel on resources determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, each of the first hop and the second hop being configured by bundling a pre-set number of slots used for transmitting the uplink channel, the slot being configured to include the uplink symbol, each of the first hop and the second hop being configured by consecutive slots in a time domain, and each of the first hop and the second hop being transmitted on different PRBs (Physical Resource Blocks) by frequency hopping.

2. The method of claim 1, wherein the preset number is received from the base station.

3. The slots included in the first hop are indexed with the same index; 2. The method of claim 1, wherein the slots included in the second hop are indexed with the same index.

4. The method according to claim 1, characterized in that, when the number of consecutive slots used for transmitting the uplink channel is less than the previously set number, the first hop or the second hop is composed of a number of consecutive slots less than the previously set number.

5. The method according to claim 1 , wherein a slot used for transmitting the uplink channel includes the uplink symbol and a flexible symbol.

6. the first hop consists of a first slot and a second slot; The first slot includes a first DM-RS (Demodulation Reference Signal), and the second slot includes a second DM-RS; The first DM-RS and the second DM-RS are transmitted on resources of the same number of PRBs starting from the PRB position of the same frequency domain, and are transmitted using the same phase, the same transmission power, the same QCL (Quasi Co-Location), and the same beamforming; the second hop consists of a third slot and a fourth slot; the third slot includes a third DM-RS, and the fourth slot includes a fourth DM-RS; The method according to claim 1, characterized in that the third DM-RS and the fourth DM-RS are transmitted on resources of the same PRB number starting from the same PRB position in the same frequency domain, and are transmitted using the same phase, the same transmission power, the same Quasi Co-Location (QCL), and the same beamforming.

7. At least one of the downlink symbol or flexible symbol is present between a last symbol to which the repeatedly transmitted uplink channel in the first slot is mapped and a first symbol to which the repeatedly transmitted uplink channel in the second slot is mapped; The method according to claim 6, characterized in that at least one of the downlink symbol or the flexible symbol exists between the last symbol to which the repeatedly transmitted uplink channel in the third slot is mapped and the first symbol to which the repeatedly transmitted uplink channel in the fourth slot is mapped.

8. The method according to claim 1, wherein the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

9. The method of claim 1 , wherein the uplink channel is transmitted in a time domain interval.

10. receiving information about the time domain interval from the base station; 10. The method of claim 9, wherein the time domain interval is constructed based on information about the time domain interval.

11. The method of claim 10, wherein the information about the time domain duration includes any one of a number of slots, a number of symbols, and a number of repeated transmissions of the uplink channel.

12. The method of claim 9, wherein the time domain duration is from a time when the repeated transmission of the uplink channel starts to a time when the repeated transmission of the uplink channel ends.

13. The method of claim 9, wherein the time domain section is composed of consecutive slots in the time domain including at least one of the uplink symbol and the flexible symbol.

14. the time domain interval includes a first time domain interval and a second time domain interval; The first time domain interval is configured to correspond to a first pattern; the second time domain interval is configured to correspond to a second pattern; The first pattern and the second pattern are composed of a plurality of slots, 10. The method of claim 9, wherein the first pattern and the second pattern each include a plurality of slot configurations that are different from each other.

15. The DM-RSs included in each of the plurality of slots constituting the first pattern are transmitted on resources having the same number of PRBs starting from the PRB positions in the same frequency domain, and are transmitted using the same phase, the same transmission power, the same Quasi Co-Location (QCL), and the same beamforming; The method according to claim 14, characterized in that the DM-RSs included in each of the plurality of slots constituting the second pattern are transmitted on resources of the same number of PRBs starting from PRB positions in the same frequency domain, and are transmitted using the same phase, the same transmission power, the same Quasi Co-Location (QCL), and the same beamforming.

16. A terminal for transmitting an uplink channel in a wireless communication system, the terminal comprising: Transmitter / receiver; a processor for controlling the transceiver; The processor, receiving first information from a base station, the first information being information related to a time division duplex (TDD) configuration; The first information includes information regarding a type of a symbol constituting a slot, The type of the symbol is any one of a downlink symbol set to be available for downlink transmission, an uplink symbol set to be available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol; transmitting an uplink channel to the base station repeatedly on resources determined based on the first information; The uplink channel is repeatedly transmitted on a first hop and a second hop, and the first hop and the second hop are each configured by bundling a slot used for transmitting a pre-set number of uplink channels; A slot used for transmitting the uplink channel is configured to include the uplink symbol, The first hop and the second hop each consist of consecutive slots in a time domain; The terminal, wherein the first hop and the second hop are transmitted on different PRBs (Physical Resource Blocks) by frequency hopping.

17. The terminal of claim 16, wherein the pre-set number is received from the base station.

18. The slots included in the first hop are indexed with the same index; The terminal of claim 16, wherein the slots included in the second hop are indexed with a same index.

19. The terminal of claim 16, characterized in that, when the number of consecutive slots used for transmitting the uplink channel is less than the pre-set number, the first hop or the second hop is composed of a number of consecutive slots less than the pre-set number.

20. 13. A method for receiving an uplink channel in a wireless communication system, the method being performed by a base station, comprising: transmitting, to a terminal, first information related to a Time Division Duplex (TDD) configuration, the first information including information related to a type of a symbol constituting a slot, the type of the symbol being any one of a downlink symbol set as available for downlink transmission, an uplink symbol set as available for uplink transmission, and a flexible symbol not set as the downlink symbol or the uplink symbol; receiving, from the terminal, an uplink channel repeatedly transmitted on a resource determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, each of the first hop and the second hop being configured by bundling a pre-set number of slots used for transmitting the uplink channel, the slot being configured to include the uplink symbol, each of the first hop and the second hop being configured by consecutive slots in a time domain, and each of the first hop and the second hop being transmitted on different PRBs (Physical Resource Blocks) by frequency hopping.

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