METHOD AND APPARATUS FOR TRANSMITTING UPLINK CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - Patent application

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 underway to develop a new fifth-generation (5G) communication system to meet the increasing demand for wireless data traffic. 5G communication systems are also called post-4G network communication systems, post-LTE systems, or new radio (NR) systems. To achieve high data rates, 5G communication systems include systems that operate using millimeter wave (mmWave) bands above 6 GHz, and also include communication systems that operate using frequency bands below 6 GHz to ensure coverage. As a result, implementation forms for base stations and terminals are under consideration.

[0003] This increases efficiency and allows communication providers to offer more data and voice services over a given bandwidth. Therefore, the 3GPP (registered trademark, same 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 lower 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 a cell user. For example, when a cell's downlink traffic is larger than its 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, technologies being discussed for 5G communication systems include beamforming, massive multiple input / output (massive MIMO), full dimension multiple input / output (FD-MIMO), array antenna, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies. In addition, to improve the system network, technological developments are being carried out for the 5G communication system in areas such as advanced small cells, improved small cells, cloud radio access networks (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.Other advanced coding modulation (ACM) methods being developed for 5G systems include hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[0005] Meanwhile, in a human-centered connected network where humans generate and consume information, the Internet is evolving into the Internet of Things (IoT) network, which exchanges information among distributed components such as objects. Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connections to cloud servers. Implementing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. 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 connecting objects. In an IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects to create new value in human life. Through the integration and blending of existing information technology (IT) with various industries, IoT can be applied in areas 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 using 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. Generally, mobile communication systems are being developed to provide voice services while guaranteeing user activity.

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

[0008] The present specification aims to provide a method and 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, which is performed by a terminal, is a method for transmitting an uplink channel in a wireless communication system, which is performed by a base station using TDD (Time Division Duplex) receiving first information related to a (Duplex) configuration, the first information including information related to a type of symbols constituting a slot, the type of 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; repeatedly transmitting an uplink channel to the base station on resources 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 each being configured by bundling a predetermined number of slots used for transmitting the uplink channel, the slot used for transmitting the uplink channel including the uplink symbol, the first hop and the second hop each being configured as consecutive slots in a time domain, and the first hop and the second hop each being transmitted on different physical resource blocks (PRBs) by frequency hopping.

[0011] Also, in this specification, the method may further include 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 that transmits an uplink channel in a wireless communication system, the terminal including a transceiver and a processor that controls the transceiver, the processor receiving a time division duplex (TDD) signal from a base station. the first information includes information related to a (non-repeated) duplex configuration, and the first information includes information related to a type of symbols constituting a slot, the type of 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; and the base station repeatedly transmits 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, the first hop and the second hop each being configured by bundling a predetermined number of slots used for transmitting the uplink channel, the slot used for transmitting the uplink channel being configured to include the uplink symbol, the first hop and the second hop each being configured as consecutive slots in a time domain, and the first hop and the second hop each being transmitted on different physical resource blocks (PRBs) by frequency hopping.

[0013] Also, in this specification, the processor may receive information about the time domain interval from the base station, and the time domain interval may be configured based on the information about the time domain interval.

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

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

[0016] Furthermore, in this specification, 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 characterized in that it is composed of fewer consecutive slots than the previously set number.

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

[0018] Furthermore, in this specification, the first hop is characterized in that it 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 with 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, the second hop is characterized in that it 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 with 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, the second hop is characterized in that it is composed 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 third DM-RS and the fourth DM-RS are transmitted on resources with 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, the

[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 transmitted within a time domain interval.

[0022] In addition, in this specification, the information about the time domain duration includes any one of the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel.

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

[0024] In addition, in this 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 with a plurality of slots, and the plurality of 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 characterized in that it 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 Quasi Co-Location (QCL), and the same beamforming, and the DM-RS included in each of the multiple slots constituting the second pattern is characterized in that it 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 Quasi Co-Location (QCL), 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 on a type of symbol constituting a slot, the type of 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 each being configured by bundling a predetermined number of slots used for transmitting the uplink channel, the slot used for transmitting the uplink channel including the uplink symbol, the first hop and the second hop each being configured as consecutive slots in a time domain, the first hop and the second hop each being configured as different Physical Resource Blocks (PRBs) due to frequency hopping. The present invention is characterized in that it includes a step of transmitting the signal on a block. [Effects of the Invention]

[0028] This document is directed to transmitting uplink channels 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 are transmitted in combination with each other.

[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 explanation of the drawings]

[0032] [Figure 1] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system. [Figure 2] FIG. 1 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] 1 is a diagram illustrating physical channels used in a 3GPP system and a typical signal transmission method using the physical channels. [Figure 4a] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4b] FIG. 1 illustrates an SS / PBCH block 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] FIG. 1 illustrates a method for configuring a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 1 is a conceptual diagram illustrating 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] 2A and 2B are block diagrams showing the configurations of a terminal and a base station according to an embodiment of the present invention. [Figure 12] 1 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 an embodiment of the present invention. [Figure 15] 1 illustrates a method for scheduling a physical uplink control channel according to an embodiment of the present invention. [Figure 16] 1 illustrates repeated transmission of a physical uplink control channel according to an embodiment of the present invention. [Figure 17] 1 illustrates a problem that occurs when a UE repeatedly transmits a PUSCH in a TDD situation according to an 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 an embodiment of the present invention. [Figure 19] 10 illustrates a method for combining repeatedly transmitted PUSCHs according to an embodiment of the present invention. [Figure 20] 10 illustrates a method for combining repeatedly transmitted PUSCHs 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. [Figure 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. [Figure 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] 10 illustrates a method for determining a symbol position to which a DMRS included in a repeatedly transmitted PUSCH 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. [Figure 30] 1 illustrates a method for repeatedly transmitting a PUCCH according to one embodiment of the present invention. [Figure 31] 1 illustrates a method for repeatedly transmitting a PUSCH according to an embodiment of the present invention. [Figure 32] 1 illustrates a method for repeatedly transmitting a PUSCH according to an embodiment of the present invention. [Figure 33] 10 illustrates a method for configuring resources for transmitting PUCCH according to one embodiment of the present invention. [Figure 34] 10 shows that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on the same symbol. [Figure 35] 10 shows that each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention is transmitted on different symbols. [Figure 36] 10 shows that each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention is transmitted on different symbols. [Figure 37] 10 shows 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 is set for each of the repeatedly transmitted PUCCHs according to an embodiment of the present invention. [Figure 39] 10 illustrates PRBs for transmitting DMRSs configured for each of repeatedly transmitted PUCCHs according to an embodiment of the present invention. [Figure 40] 10 illustrates PRBs for transmitting DMRSs configured for each of repeatedly transmitted PUCCHs according to an embodiment of the present invention. [Figure 41] 1 illustrates a PUSCH that is repeatedly transmitted according to an embodiment of the present invention. [Figure 42] 10 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. [Figure 43] 10 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. [Figure 44] 10 illustrates transmission cancellation of a repeatedly transmitted PUSCH based on a repeatedly transmitted PUCCH according to an embodiment of the present invention. [Figure 45] 10 illustrates a PUCCH that is repeatedly transmitted according to one embodiment of the present invention. [Figure 46] 10 illustrates a PUCCH repeatedly transmitted and intra-slot frequency hopping according to one embodiment of the present invention. [Figure 47] 1 illustrates a PUCCH repeatedly transmitted and inter-slot frequency hopping according to an embodiment of the present invention. [Figure 48] 10 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] 10 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] 10 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] 10 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] 10 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] 10 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] 1 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 55] 1 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 56] 1 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 57] 1 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 58] 1 illustrates a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 59] 1 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] 1 illustrates a method for indicating a time domain interval according to an embodiment of the present invention. [Figure 64] 1 illustrates a method for indicating a time domain interval according to an embodiment of the present invention. [Figure 65] 1 illustrates a method for indicating a time domain interval according to an embodiment of the present invention. [Figure 66] 1 illustrates a method for indicating a time domain interval according to an embodiment of the present invention. [Figure 67] 1 illustrates a method for determining a time domain window in a carrier aggregation situation according to one embodiment of the present invention. [Figure 68]1 illustrates a method for determining a time domain window in a carrier aggregation situation according to one embodiment of the present invention. [Figure 69] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 70] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 71] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 72] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 73] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 74] 1 illustrates a method for setting a time domain interval according to an embodiment of the present invention. [Figure 75] 1 is a flowchart illustrating a method for transmitting an uplink channel according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The terms used in this specification are currently widely used and general terms that are possible based on the functions of the present invention. However, the terms may be changed according to the intentions, practices, and the emergence of new technologies of those skilled in the art. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, their meanings will be 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 meaning of the terms and content 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 "equivalent to" or "equivalent to" based on a particular threshold value may be appropriately substituted with "greater than" or "less than," 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), and 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, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (EUMTS) that uses 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 to support 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 clarity, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0036] Unless otherwise specified herein, a base station may refer to a next-generation Node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise specified, a terminal may refer to a user equipment (UE). Hereinafter, for ease of understanding, each content will be described separately as an embodiment, but the embodiments may be used in combination with each other. In this disclosure, a configuration of a terminal may refer to a configuration by a base station. Specifically, a base station may transmit a channel or a signal to a terminal and configure parameter values ​​used in the operation of the terminal or the 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, a 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 has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in a 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 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe with a length of 1 ms is 2 μ slots, each of which may be 2 -μ ms. 2 in one subframe μ slots, 0 to 2 each μ In addition, slots in one wireless frame may be assigned numbers from 0 to 10*2. μ The allocated numbers may range from -1 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] 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, Figure 2 shows the structure of a resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 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 refers to 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 Figure 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 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 the 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 with 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure may be similarly applied to slots having a different number of OFDM symbols. Referring to FIG. 2, each OFDM symbol is N size,μ grid,x *N RB sc The carrier frequency includes four subcarriers. The subcarrier types can be divided into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0042] One RB is N RB sc A resource may be defined by (e.g., 12) consecutive subcarriers. For reference, a resource configured using 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 can be uniquely defined within 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 l may be 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 time and frequency parameters necessary to demodulate DL signals and transmit UL signals at the appropriate times.

[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. In frequency division duplex (FDD), i.e., paired spectrum, a radio frame used as a DL carrier 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. DL symbols allow DL transmission but not UL transmission. UL symbols allow UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL according to the signal.

[0045] Information about each symbol type, i.e., information indicating any one of DL symbols, UL symbols, and flexible symbols, can be configured using cell-specific or common radio resource control (RRC) signals. In addition, information about each symbol type can be additionally configured using UE-specific or dedicated RRC signals. The base station notifies i) the duration of the cell-specific slot configuration, ii) the number of slots with only DL symbols from the beginning of the cell-specific slot configuration period, 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 cell-specific slot configuration period, 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 using either UL symbols or DL ​​symbols is a flexible symbol.

[0046] When information about symbol types is configured using UE-specific RRC signals, the base station can signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of DL symbols among the N symbols of the corresponding slot for each slot, and the number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of a slot can be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of a slot can be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the symbols in a slot, 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 N slot symb The number of UL symbols among the N symbols of the corresponding slot can be signaled. In this case, the DL symbols of a slot can be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of a slot can be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the symbols in a slot, the symbol that is not configured using either the UL symbol or the DL symbol is the flexible symbol.

[0047] The type of symbol consisting of the RRC signal as described above is referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration consisting of the RRC signal 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 consisting 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 denotes a downlink symbol, U denotes an uplink symbol, and X denotes 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 a UE is powered on or camps on a new cell, the UE performs an initial cell search (S101). Specifically, the UE may synchronize with a BS during the initial cell search. To this end, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from a base station to synchronize with the base station and obtain information such as a cell ID. The UE may then 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 control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to 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 at the physical layer in Radio Resource Control (RRC), and is also referred to as remaining system information or system information block (SIB) 1.

[0053] When a UE first accesses a base station or does not have radio resources for signal transmission, the UE may perform a random access procedure with the base station (operations S103 to S106). First, the UE may transmit a preamble over a physical random access channel (PRACH) (S103) and receive a response message for the preamble from the base station over a PDCCH and a corresponding PDSCH (S104). If the UE receives a valid random access response message, the UE transmits data including the UE's identifier and the like to the base station over a physical uplink shared channel (PUSCH) indicated by a UL grant transmitted from the base station over the PDCCH (S105). Next, the UE waits for reception of a PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH via the UE's identifier (S106), the random access process is terminated. During the random access process, the UE may acquire UE-specific system information required for the UE to operate correctly at the physical layer in the RRC layer. Once the UE acquires 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 wireless access network (RAN). More specifically, the base station and terminal can perform storage management including broadcasting cell system information required for all terminals in the cell, transmission management of paging messages, mobility management and handover, terminal measurement reporting and control thereof, terminal capability management, and device management at the RRC layer. Generally, the update of signals transmitted at the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission / reception period (i.e., transmission time interval, TTI) at the physical layer, so that RRC signals 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 vary depending on the intended use. The uplink control information (UCI) transmitted by the UE to the base station through the UL includes a DL / UL ACK / NACK signal, 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 channel state information (CSI). In a 3GPP NR system, a UE may transmit control information, such as the HARQ-ACK and CSI described above, over the PUSCH and / or PUCCH.

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

[0057] When a UE is powered on or wants to access a new cell, it may acquire 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. To this end, the UE may receive synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from a base station and synchronize to the base station. In this case, the UE may obtain information such as a cell identity (ID).

[0058] Referring to Figure 4a, the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into a PSS and an SSS. The PSS can be used to obtain time-domain and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and a cell group ID. Referring to Figure 4a and Table 2, an SS / PBCH block can be configured using 20 consecutive RBs (=240 subcarriers) in the frequency domain and 4 consecutive OFDM symbols in the time domain. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting 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, 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 within the physical layer cell identifier group. (2) ID The UE may detect the PSS and identify one of three unique physical layer identifiers. In addition, the UE may detect the SSS and identify one of 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 10-ms radio frame may be divided into two 5-ms half-frames. Referring to Figure 4b, the slots in which the SS / PBCH blocks are transmitted within each half-frame are described. The slots in which the SS / PBCH blocks are 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, or 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 or 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. In this case, n=0 or 1 for carrier frequencies below 3 GHz. Additionally, n=0, 1, 2, or 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. In this case, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 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 6 GHz.

[0067] 5a and 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 control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. 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, a UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. The base station may then perform channel coding (e.g., polar coding) (S204) and then perform rate matching according to the amount of resources used for PDCCH transmission (S206). The base station may then multiplex DCI based on a control channel element (CCE)-based PDCCH structure (S208). Additionally, the base station may apply additional processes, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI (S210), and then map the DCI to resources to be transmitted. A CCE is a basic resource unit for the 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 within which the PDCCH, i.e., a control signal for the UE, is transmitted. In addition, a search space, which will be described later, may be mapped to a core set. Thus, rather than 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. A base station may configure one or more core sets for a UE per cell. A core set may be configured using up to three consecutive symbols on the time axis. Additionally, 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 using consecutive PRBs, and core sets #2 and #3 are configured using non-consecutive PRBs. A core set may be positioned within any symbol within 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 a PDCCH to a UE, each core set may have at least one search space. In an embodiment of the present disclosure, a search space is a set of all time-frequency resources (hereinafter referred to as PDCCH candidates) through which the UE's PDCCH can be transmitted. 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, a UE may monitor a PDCCH that all UEs in a cell belonging to the same base station are configured to search in common. In addition, a UE-specific search space may be configured for each UE so that the UE monitors the PDCCH allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, the search spaces between UEs may be partially overlapped due to the limited control areas in which the PDCCHs are allocated. Monitoring the PDCCH includes blind decoding to find PDCCH candidates within 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 specific UE to transmit UL or DL ​​scheduling information to that UE is referred to as a UE-specific PDCCH. A common PDCCH may be included in a common search space, and a UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0073] A base station may signal 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) to each UE or a group of UEs via the PDCCH. The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data excluding specific control information or specific service data via the PDSCH. In addition, a UE may receive data excluding specific control information or specific service data via the PDSCH.

[0074] A base station may transmit a PDCCH to a UE (one or more UEs) including information about where PDSCH data is to be transmitted and how the PDSCH data will be received and decoded by the corresponding UE. For example, assume that the DCI transmitted on a specific PDCCH is CRC masked using an RNTI of "A," and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., 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, through the received PDCCH information, receives the PDSCH indicated by "B" and "C."

[0075] Table 3 illustrates one embodiment of a physical uplink control channel (PUCCH) used 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 information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include a positive ACK (simply ACK), a negative ACK (hereinafter NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, an ACK may be represented by a bit value of 1, and a NACK may be represented 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 a 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 over 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 over different RBs. In this case, the sequence may be a cyclic shift (CS) sequence of the base sequence used for PUCCH format 0. This allows the UE to 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 given 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 = 1, one bit UCI 0 and 1 can be mapped to two cyclic shifted sequences, respectively, with a difference in cyclic shift value of 6. bit = 2, the 2-bit UCI 00, 01, 11, 10 can be mapped to four cyclic shifted sequences with a cyclic shift value difference of 3, respectively.

[0083] PUCCH format 1 carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted using consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, bit The UCI with M = 1 is modulated by BPSK. bitThe UCI, where d(0) = 2, is modulated using quadrature phase shift keying (QPSK). The modulated complex-valued symbol d(0) is multiplied by a sequence of length 12 to obtain a signal. The terminal spreads the obtained signal using a time-domain orthogonal cover code (OCC) on even-numbered OFDM symbols assigned to PUCCH format 1 and transmits it. 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. In odd-numbered OFDM symbols of PUCCH format 1, a demodulation reference signal (DMRS) is spread using OCC and mapped.

[0084] PUCCH format 2 can deliver UCI exceeding two bits. PUCCH format 2 can 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 sequence 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 exceeding 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 M-ary PUCCH using π / 2-2 phase shift keying (BPSK) or QPSK. bit The complex-valued symbols d(0) to d(M symb -1) where, when π / 2-BPSK is used, M symb =M bit and when using QPSK, M symb =M bit / 2. The UE does not need to 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 of 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, maps it to each RE, and transmits 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 over the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some of the 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, the 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 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 bandwidth part (BWP) consisting of a contiguous portion of the carrier's bandwidth. A terminal operating according to TDD or using an unpaired spectrum may be configured with up to four DL / UL BWP pairs per carrier (or cell). The terminal can also activate one DL / UL BWP pair. A terminal operating according to FDD or using a paired spectrum may be configured with up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per uplink carrier (or cell). The terminal can activate one DL BWP and one UL BWP per carrier (or cell). The terminal does not need to receive or transmit on time-frequency resources other than the activated BWPs. An activated BWP can be referred to as an active BWP.

[0090] A base station can indicate to a terminal which BWPs among configured BWPs are activated using downlink control information (DCI). The BWP indicated in the DCI is activated, and other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station can include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI scheduling a PDSCH or a PUSCH to change the DL / UL BWP pair of the terminal. The terminal can receive the DCI scheduling a PDSCH or a PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH to change the DL BWP of the terminal. In an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH 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 using 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 also be referred to as a primary cell (PCell) or a secondary cell (SCell), or a primary SCell (PScell). However, for convenience of explanation, the term "component carrier" will be used hereinafter.

[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 Figure 8 shows each of the component carriers having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Also, although the component carriers are shown as being adjacent to each other on the frequency axis, the drawing is shown in a logical concept, and the component carriers 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 Figure 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 overall system band is expanded by carrier aggregation, the frequency band used for communication with each UE may be specified in component carrier units. UE A may use the overall system band of 100 MHz and perform communication using all five component carriers. UEs B1 to B5 may use only a 20 MHz bandwidth and perform communication using one component carrier. UEs C1 and C2 may use a 40 MHz bandwidth and each perform communication using two component carriers. The example in FIG. 8 shows a case where UE C1 uses two non-adjacent component carriers and UE C2 uses two adjacent component carriers.

[0096] 9A and 9B are diagrams for explaining single-carrier communication and multi-carrier communication. Specifically, FIG. 9A shows a single-carrier subframe structure, and FIG. 9B shows a multi-carrier subframe structure.

[0097] Referring to FIG. 9(a), in FDD mode, a typical wireless communication system may transmit or receive data through one DL band and one UL band corresponding thereto. In another specific embodiment, in TDD mode, the wireless communication system may divide a radio frame into UL time units and DL time units in the time domain and transmit or receive data through the UL / DL time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) may be aggregated into UL and DL so that a 60 MHz bandwidth can be supported. The CCs may or may not be adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case where the bandwidth of the UL CC and the bandwidth of the DL CC are identical and symmetrical, the bandwidth of each CC may be determined independently. In addition, asymmetric carrier aggregation, in which the number of UL CCs and DL CCs differs, is possible. The DL / UL CC allocated / configured to a specific UE through RRC may be referred to as the serving DL / UL CC of the specific UE.

[0098] A base station may communicate with a UE by activating some or all of the UE's serving CCs or deactivating some CCs. The base station can change the CCs to be activated / deactivated and the number of CCs to be activated / deactivated. When a base station allocates CCs available to a 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. A CC that is not deactivated by the UE is called a Primary CC (PCC) or a Primary Cell (PCell), and a 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 resources and UL resources, i.e., a combination of DL CC and UL CC. A cell can be configured with only DL resources or a combination of DL resources 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 system information. Carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called an SCell. A carrier corresponding to a PCell in the DL is a DL PCC, and a carrier corresponding to a PCell in the UL is a UL PCC. Similarly, a carrier corresponding to an SCell in the DL is a DL SCC, and a carrier corresponding to an SCell in the UL is a UL SCC. According to UE capabilities, a serving cell can 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" which refers to several geographical areas for which communication services are provided by one base station or one antenna group. That is, one component carrier may also be referred to as a scheduling cell, scheduled cell, primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, to distinguish between cells which refer to several geographical areas and cells of carrier aggregation, in this disclosure, cells of carrier aggregation are referred to as CCs, and cells of geographical areas are referred to as cells.

[0101] 10 illustrates an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, a control channel transmitted over a first CC may schedule a data channel transmitted over the 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 essentially be the scheduling cell, and a specific SCell may be designated as the 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 as a 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 transmit only a PDCCH for scheduling its PDSCH without using 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 specific CC (e.g., a 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] 9 and 10 show the subframe structure of a 3GPP LTE-A system, and the same or similar configurations may be applied to a 3GPP NR system, except that in a 3GPP NR system, the subframes in FIGS. 9 and 10 may be replaced with slots.

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

[0105] In the embodiments 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 referred to as User Equipment (UE), Station (STA), Mobile Subscriber (MS), etc. In addition, in the embodiments of the present disclosure, the base station controls and manages 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 referred to as a next generation Node B (gNB) or Access Point (AP), etc.

[0106] As shown, a 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 this disclosure. For example, the processor 110 can receive slot configuration information, determine a slot configuration based on the received 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. To this end, the communication module 120 may include multiple network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. Although the communication module 120 is shown as an integrated module in the 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, an external device, and a server using a mobile communication network, and can provide cellular communication services in a first frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 121 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, an external device, and a server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0110] The cellular communication interface card 122 transmits and receives 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 cellular communication services using the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band above 6 GHz. 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 in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz 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, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses an unlicensed band. For example, the unlicensed band may be 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or the 5 GHz band above 52.6 GHz. The at least one NIC module of the unlicensed band communication interface card 123 may independently or dependently communicate with at least one of the base station 200, an external device, and a server in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0112] Next, the memory 130 stores control programs and various data used by the terminal 100. Such control programs may include predetermined programs required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[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 instructions from the processor 110 using various output means.

[0114] The display unit 150 then outputs various images to a display screen, and can display various display objects, such as content executed by the processor 110 or a user interface based on a control instruction of the processor 110.

[0115] Furthermore, 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 each unit of the base station 200 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 this 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. To this end, the communication module 220 may include multiple 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. Although the communication module 220 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.

[0118] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, the external device, and the server using a mobile communication network, and can provide cellular communication services using the first frequency band based on instructions from the processor 210. According to one 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 in accordance with a cellular communication standard or protocol for 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 cellular communication services using the second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band above 6 GHz. 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 in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz 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, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module using an unlicensed band. For example, the unlicensed band may be 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or the 5 GHz band above 52.6 GHz. The at least one NIC module of the unlicensed band communication interface card 223 may independently or dependently perform wireless communication with at least one of the terminal 100, an external device, and a server in accordance with the 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 separated blocks indicate logically distinct device elements. Therefore, the above-described device elements may be implemented as a single chip or multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. In addition, the user interface 140 and the display unit 150 may be further provided in the base station 200 as necessary.

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

[0124] In this case, 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 UE may receive the DCI transmitted in the control resource set and search space and perform an operation indicated by the DCI (e.g., uplink data transmission using the PUSCH). In this case, the format of the DCI for PUSCH scheduling may be DCI formats 0_0, 0_1, and 0_2. The DCI of DCI formats 0_0, 0_1, and 0_2 may be configured to include a TDRA field including time-domain information of the PUSCH. In this case, 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 UE 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 within 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 refer to the subcarrier spacing (SCS) of the cell where the PUSCH is scheduled and the cell where the UE receives the PDCCH, respectively. floor(x) is a function that returns the largest integer among integers equal to or smaller than x. In this specification, slot n may refer to the slot indexed with index n.

[0125] 12(a), the subcarrier spacing of the cell in which the UE receives the PDCCH and the cell in which the PUSCH is scheduled may be the same. In this case, if the UE 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 the PUSCH and the range of values ​​that can be used for SLIV may vary depending on the PUSCH mapping type. PUSCH mapping type A only allows resource allocation including a DMRS symbol, and the DMRS symbol may be located at the third or fourth symbol of a slot depending on the value specified by a higher layer. That is, for PUSCH mapping type A, the starting symbol index (S) of the PUSCH is 0, and the length (L) of the PUSCH may have any value from 4 to 14 (12 for extended CP) depending on the DMRS symbol position. For PUSCH mapping type B, the first symbol of the PUSCH may be a DMRS symbol. Therefore, S may have any value from 0 to 13 (11 for extended CP), and L may have any value from 1 to 14 (12 for extended CP). Also, one PUSCH must not cross a slot boundary, and the sum of S and L must 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 A 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 can be divided into two types depending on 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 (type 0), may be a type in which a certain number of PRBs are bundled to form an RBG according to the number of RBs included in a BWP configured in a terminal, and whether an RBG is used may be indicated using a bitmap per RBG. That is, the terminal may determine whether a corresponding RBG is used using a bitmap transmitted from a 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 a terminal, the more PRBs may be configured. Referring to FIG. 13(a), the BWP size configured in a terminal is 72 PRBs, and one RBG may be composed of 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 starting 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. RBGs may be indexed up to RBG17 in the same manner. 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 PRBs constituting the corresponding RBG are used based on the received 18 bits. If the bit value is 0, the terminal can determine that a PUSCH is not scheduled for any of the PRBs constituting the corresponding RBG. If the bit value is 1, the terminal can determine that a PUSCH is scheduled for all PRBs in the corresponding RBG. In this case, the bit values ​​may be reversed. ii) The second type, frequency resource allocation type 1, may indicate information about 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 a terminal is 50 PRBs and PUSCH is scheduled for PRB2 to PRB11 among the 50 PRBs, the start index of the consecutive PRBs may be 2 and the length may be 10. That is, the terminal can 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. size BWP may be the size of the BWP configured 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 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 that schedules the PUSCH, the terminal may be configured by a higher layer to use only one of the two frequency resource allocation types described above or to dynamically use both types. When the terminal is configured to dynamically use two types, the terminal can determine the type 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 a configured grant may be described as grant-free transmission. The uplink shared channel transmission method based on a configured grant may be a method in which, if a base station configures resources available for uplink transmission to a terminal through a higher layer (i.e., RRC signaling), the terminal transmits the uplink shared channel using the configured resources. The uplink shared channel transmission method based on a configured grant may be classified into two types depending on whether the DCI indicates activation or release. i) Type 1 uplink shared channel transmission method based on a 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 uplink shared channel transmission method based on a 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, to ensure high reliability, uplink transmission may be repeated over 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 the mod(n-1, 4)+1 value may be used in the n-th repeated transmission. That is, an RV corresponding to the remainder obtained by dividing n-1 by 4 and adding 1 may be used. In addition, a terminal configured to repeatedly transmit an uplink channel can only start repeated transmission in a slot where the RV value is 0. However, if the RV sequence is {0,0,0,0} and the uplink channel is configured to be repeatedly transmitted over eight slots, the terminal cannot start repeated transmission in the eighth slot. The UE may terminate the repeated transmission when the number of repeated transmissions set by the upper layer is reached or the period is exceeded, or when an UL grant having the same HARQ process ID is received. The UL grant may refer to DCI scheduling 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 are 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 0_1 ​​or 0_2 included in a PDCCH scheduling PUSCH from the base station, the terminal can repeatedly transmit the PUSCH over K consecutive slots. The value of K may be set by a higher layer or may be a value included in the TDRA field of the DCI and set to the terminal. For example, referring to FIG. 14(a), the terminal can receive a PDCCH scheduling PUSCH in slot n, and the value of K2 may be set from the DCI included in the received PDCCH. In this case, if the value of K2 is 2 and the value of K is 4, the terminal can start PUSCH repeat transmission in slot n+K2 and repeatedly transmit PUSCH up to slot n+K2+K-1. That is, the terminal starts PUSCH repeat transmission at n+2 and repeatedly transmits PUSCH up to n+5. In this case, the time and frequency resources on 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) within the slot. ii) Next, PUSCH repetition transmission type B will be described. PUSCH repetition transmission type B may be used by the UE to repeatedly transmit a PUSCH with low latency to meet requirements of URLLC, etc. The UE may be configured with the symbol (S) at which the PUSCH repetition transmission 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 length (L) may be for a nominal PUSCH temporarily determined, rather than for a PUSCH actually transmitted by the UE. There may not be another symbol between nominal PUSCHs configured to be repeatedly transmitted. That is, the nominal PUSCHs may be consecutive in the time domain. The UE can determine the actual PUSCH from the nominal PUSCH. One nominal PUSCH may be determined as one or more actual PUSCHs. The base station can configure unavailable symbols in PUSCH repetition transmission type B in the terminal.Symbols that cannot be used in PUSCH repetition transmission type B may be referred to as invalid symbols. The UE may exclude invalid symbols from resources configured for transmitting the nominal PUSCH. As described above, the nominal PUSCH is configured to be repeatedly transmitted on consecutive symbols. However, if invalid symbols are excluded, the resources for 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 UE by the base station. Referring to FIG. 14(b), the UE may be scheduled for a 5-symbol long PUSCH transmission starting from the 12th symbol of the first slot (slot n), and four Type B repetition transmissions may be configured. In this case, 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). 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). 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 scheduled resources for the fourth nominal PUSCH (nominal#4) can 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 can range from 0 to 13 for a normal CP, and can range from 0 to 11 for an extended CP.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 combined into one actual PUSCH (actual #3 and actual #4) by combining consecutive symbols excluding 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 to be actually transmitted. 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 actual PUSCH may be omitted without being transmitted. This is because the actual PUSCH consisting of one symbol cannot include any information other than DMRS.

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

[0138] In PUSCH repetition 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 UE. If intra-slot frequency hopping is configured in the UE, the UE divides the PUSCH into two in the time domain in the slot in which the PUSCH is transmitted, and transmits one half using a scheduled PRB and the other half using a PRB obtained by adding an offset value to the scheduled PRB. In this case, two or four values ​​of the offset value may be configured in a higher layer depending on the active BWP size, and one of these values ​​may be configured (indicated) to the UE by DCI. If inter-slot frequency hopping is configured in the UE, the UE may transmit the PUSCH using a PRB scheduled in a slot with an even slot index and transmit the PUSCH using a PRB scheduled in an odd slot with an offset value added.

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

[0140] When performing PUSCH repeated transmission, if a symbol scheduled for PUSCH transmission in a specific 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 in the slot including the overlapping symbol, and the overlapping PUSCH may be postponed and not transmitted in the next slot.

[0141] When a terminal receives DCI of DCI format 1_0, 1_1, or 1_2 that schedules a 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 an HARQ-ACK, a Scheduling Request (SR), and Channel State Information (CSI). The HARQ-ACK may be an HARQ-ACK indicating whether the terminal has successfully received two types of channels. A first type may be an HARQ-ACK for a PDSCH when a PDSCH is scheduled to the terminal using DCI of DCI format 1_0, 1_1, or 1_2. A second type may be an HARQ-ACK for a 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 an 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 in 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 UE 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 UE, the last symbol in which a PDSCH is transmitted may refer to 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] 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 UE may receive the PDCCH scheduling the PDSCH and PUCCH from the base station in slot n. In this case, the DCI included in the PDCCH received in slot n may set (indicate) a K0 value of 2 and a K1 value of 3. For example, if the last symbol in which the PDSCH is transmitted is n+K0 (i.e., n+2), the UE may transmit a HARQ-ACK for the PDSCH in 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 an embodiment of the present invention.

[0146] To ensure wide coverage in the NR system, the terminal can repeatedly transmit the long PUCCH over 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 over 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 UE can repeatedly transmit the PUCCH in 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 composed of the same number of symbols.

[0147] Frequency hopping may also be applied to PUCCH transmission to obtain diversity gain in the frequency domain. When intra-slot frequency hopping is applied, the terminal divides the time domain of a slot for transmitting the PUCCH in half, 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 transmits the PUCCH on the first PRB of a slot with an even slot index and on the second PRB of a slot with an odd slot index. Furthermore, when performing 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 configured for receiving an SS / PBCH block, the terminal may not transmit the PUCCH on the slot containing the overlapping symbol. The terminal may postpone transmitting the PUCCH that is not being transmitted to the next slot. In this case, if the symbols for PUCCH transmission in the postponed slot do not overlap with the semi-statically configured DL symbols or symbols set for receiving SS / PBCH blocks, the terminal can transmit the PUCCH.

[0148] In this specification, a problem associated with repeated transmission of a PUSCH or PUCCH by 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 is a slot in which all symbols are downlink symbols, a "U" slot is a slot in which all symbols are uplink symbols, and an "S" slot may be a slot other than a "D" slot or a "U" slot. In this case, the "S" slot may include at least one flexible symbol. PUSCH repetition transmission type B may be configured in the "S" slot and the "U" slot. Even if the base station configures (instructs) the UE to have a nominal PUSCH length of 6 symbols, the actual PUSCH length may be 2, 3, or 4 depending on the slot boundary and invalid symbols. Each of the repeatedly transmitted actual PUSCHs may include one DMRS symbol. When one DMRS symbol is mapped to one actual PUSCH, the length of the data symbols transmitted in the actual PUSCH may be 1, 2, or 3 symbols. Compared to 6-symbol PUSCH transmission, the UE must use a higher code rate when transmitting a transport block (TB) with the same number of bits. Therefore, even if repetitive transmission is configured to improve coverage performance, a high coding rate must be used, making it difficult to ensure coding gain. That is, simply having a UE repeatedly transmit a PUSCH using PUSCH repetitive transmission type B cannot solve the coverage problem. In addition, a PUSCH consisting of a small number of symbols must include at least one DMRS symbol, and the fewer the number of symbols constituting the actual PUSCH, the larger the DMRS overhead becomes, so that the coverage performance for uplink channels and signals transmitted by UEs at cell-edges may be degraded.

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

[0152] Referring to case a in FIG. 18, in a TDD situation, repeated transmission of a PUCCH can 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 can be configured, and PUCCHs with the same position and length can be repeatedly transmitted across two slots. That is, the first repeated PUCCH transmission can be transmitted on symbols 10 to 13 of the first slot, and the second repeated PUCCH transmission can 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 PUCCH transmission. Therefore, if the UL symbols available for repeated PUCCH transmission are limited, coverage problems can occur. For highly reliable repeated PUCCH transmission, limited UL symbols (symbols unavailable for repeated PUCCH transmission) must be used.

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

[0154] In order to solve the coverage problem that occurs when a PUSCH is repeatedly transmitted, multiple actual PUSCHs may be jointly transmitted. 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. Consecutive actual PUSCHs 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, must not exceed a pre-set number of symbols. That is, the total number of symbols of the combined actual PUSCH transmitted to improve coverage must not exceed a pre-set number of symbols. The pre-set number of symbols may be a value set by the base station to the terminal. The pre-set number of symbols may also be the maximum number of symbols constituting a slot. The maximum number of symbols constituting a slot may be 14 for a normal CP and 12 for an extended CP.

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

[0157] With reference to FIG. 19(a), the number of pre-set symbols 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) exceeds the pre-set number of symbols, 14, and may be dropped. 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 is no limit to the number of symbols that make up 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 #3, and the terminal can also transmit combined PUSCH #3 to the base station.

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

[0159] When constructing the above-described combined PUSCH, actual PUSCHs may be combined taking slot boundaries into consideration. Referring to FIG. 20(a), the number of pre-set symbols may be 14. Symbols transmitting consecutive actual PUSCHs starting from symbol 10 of the first slot may be combined, and this combination may be based on slot boundaries. That is, actual PUSCH #1 constitutes combined PUSCH #1, the next consecutive actual PUSCH #2 and actual PUSCH #3 constitute combined PUSCH #2, and actual PUSCH #4 and actual PUSCH #5 constitute combined PUSCH #3. Unlike FIG. 19, since there is a slot boundary between actual PUSCH #1 and actual PUSCH #2, combined PUSCH #1 may be constructed using only actual #1. The second symbol of actual PUSCH #6 (symbol 13 of the second slot) exceeds the pre-set number of symbols, 14, and may be dropped. Therefore, the first symbol of actual PUSCH #6 (symbol 12 of the second slot) consists of one symbol and may therefore 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 restricted number of symbols may be between 2 and 14.

[0160] The UE 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 UE 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-numbered units starting from the first symbol of a slot or a 10 ms radio frame. N may be a divisor of the number of symbols constituting a slot. For example, N may be 7 for a regular CP and 6 for an extended CP.

[0161] The base station may configure (instruct) the number of actual PUSCHs constituting a combined PUSCH to the terminal. The combined PUSCH may be configured by combining actual PUSCHs according to the configured number. For example, if the configured 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 combined PUSCH may be configured with actual PUSCHs whose number corresponds to the remainder when the total number of actual PUSCHs is divided by K. The actual PUSCHs may be indexed in time order.

[0162] A combined PUSCH may be formed 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 slot boundaries or invalid symbols. Multiple actual PUSCHs divided from one nominal PUSCH may be combined to form one combined PUSCH. i) When multiple actual PUSCHs divided from one nominal PUSCH are combined to form one combined PUSCH, slot boundaries can be taken into consideration. That is, only actual PUSCHs in the same slot can be combined to form a combined PUSCH. In other words, actual PUSCHs in different slots form different combined PUSCHs. ii) When multiple actual PUSCHs divided from one nominal PUSCH are combined to form one combined PUSCH, time continuity can be taken into consideration. That is, only consecutive actual PUSCHs can form 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 the number of symbols forming a slot required for coverage extension.

[0163] The base station may set (instruct) the minimum number of symbols constituting the combined PUSCH to the terminal. The base station may determine the minimum number of symbols constituting the combined PUSCH taking into consideration at least one of DMRS overhead, TB size, and coding rate. That is, the combined PUSCH may be configured by combining 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, if A1 is smaller than M, the minimum number of symbols constituting the combined PUSCH is not satisfied, so the actual PUSCH of length A1 may be combined with the actual PUSCH of length A2 to form the combined PUSCH. On the other hand, if A1+A2 is still smaller than M, the actual PUSCH of length A3 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 PUSCHs need 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 taking into consideration at least one of DMRS overhead, TB size, and coding rate. In this case, the maximum number may be 14 symbols. That is, the combined PUSCH may be formed by combining actual PUSCHs to have a length equal to or less than the maximum number. For example, if the maximum number is M and the lengths of the actual PUSCHs are A1, A2, and A3, respectively, if A1 is smaller than M but A1+A2 is greater than M, the maximum number of symbols is exceeded, so the actual PUSCH of length A1 does not need to be combined with the actual PUSCH of length A2. If A1+A2 is smaller than M, the maximum number of symbols is not exceeded, so the actual PUSCH of length A1 can be combined with the actual PUSCH of length A2 to form the combined PUSCH. A similar method may be used to determine 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 actual PUSCHs that must be combined to the terminal. For example, in PUSCH repetition transmission type B, actual PUSCHs with a length of 1 symbol may be dropped or omitted without being transmitted. Therefore, the dropped or omitted actual PUSCHs may be combined with other actual PUSCHs and transmitted. For example, if the minimum length of actual PUSCHs is M and the lengths of actual PUSCHs are A1, A2, and A3, actual PUSCHs with lengths smaller than M among A1, A2, and A3 can be combined with other adjacent actual PUSCHs 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 shorter actual PUSCH of two adjacent actual PUSCHs. For example, actual PUSCH #2 in FIG. 17 may be combined with actual PUSCH #3, which has a shorter length, of actual PUSCH #1 and actual PUSCH #3. By combining and transmitting actual PUSCHs that are dropped or omitted with other actual PUSCHs, the terminal can efficiently use resources that are dropped or omitted. Furthermore, combining actual PUSCHs can reduce DMRS overhead and increase the data transmission rate. ii) An actual PUSCH with a length smaller than the minimum length may be combined with the longer actual PUSCH of two adjacent actual PUSCHs. For example, in FIG. 17, actual PUSCH #2 may be combined with actual PUSCH #1, which has a longer length, of actual PUSCH #1 and actual PUSCH #3. This is effective in extending coverage because PUSCHs can be transmitted using resources in a relatively long time domain. 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, coverage is extended and 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 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 process of dividing the nominal PUSCH into actual PUSCHs described above 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, ineffective symbols may be excluded. The combined PUSCH may be configured with the minimum number of symbols included in the nominal PUSCH. Since this is the minimum number, the combined PUSCH may be configured with a number of symbols greater than the minimum number. The combined PUSCH may be configured taking into consideration consecutive symbols and / or slot boundaries. Specifically, the combined PUSCH is configured with the 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, further combined symbols may be symbols within the same slot. ii) The base station can set (instruct) the terminal to the maximum number of symbols constituting a combined PUSCH. That is, if the number of symbols constituting a 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 a nominal PUSCH. In this case, ineffective symbols may be excluded. For example, if the number of symbols constituting a nominal PUSCH is S and the number of configurable combined PUSCHs is Y, the combined PUSCH may be composed of floor(S / Y) or ceil(S / Y) symbols.floor(x) is a function that returns the largest integer among integers equal to or less than x. ceil(x) is a function that returns the smallest integer among integers equal to or greater than x.

[0167] Hereinafter, a frequency hopping method for obtaining diversity gain when a terminal combines and transmits multiple 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 to 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. If 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 configure 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 configure 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, if the number of symbols of the combined PUSCH is less than or equal to the minimum number of symbols per hop, the terminal may transmit the combined PUSCH without frequency hopping. Conversely, if the number of symbols of the combined PUSCH is greater 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 described in ii) 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 to be repeatedly transmitted may be divided into two in the time domain for frequency hopping. i) The entire length of the PUSCH to be 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 PUSCH symbols that make up the first hop is floor(N PUSCH symb / 2), and the number of PUSCH symbols that make up the second hop is N PUSCH symb -floor(N PUSCH symb / 2) (Method a). Alternatively, the number of PUSCH symbols constituting the first hop may be ceil(N PUSCH symb / 2), and the number of PUSCH symbols that make up 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 the sum of the lengths of each actual PUSCH. Referring to FIG. 21, when PUSCH repetition transmission type B is configured, the total actual PUSCH length, which is the sum of 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-described Method a is applied, the number of symbols constituting the first hop may be seven (from symbol 10 of the first slot to symbol 2 of the second slot). The number of symbols constituting the second hop may be eight (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 PUSCH repetition transmission type B scheme is applied to the second hop, since a PUSCH consisting of one symbol is a DMRS symbol as described above, the terminal does not need to transmit a PUSCH consisting of one symbol (the first symbol of the second hop). When the above-described method b is applied, the first hop may consist of 8 symbols and the second hop may consist of 7 symbols. Therefore, the terminal can transmit the PUSCH without dropping any symbols. As another example, when the base station and the terminal both know the symbol configuration information and the configuration for invalid symbols, the terminal can determine the hopping boundary so that a PUSCH consisting of one symbol does not occur. That is, referring to FIG. 21, when both the terminal and the base station know the symbol configuration, the terminal can apply method b to configure the first hop with 8 symbols and the second hop with 7 symbols, thereby transmitting the PUSCH without dropping any symbols. In addition, 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 UE 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. The first hop separated 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 refer to a symbol on which a PUSCH / PUCCH is transmitted.

[0172] Consecutive PUSCH symbols may be configured as the same hop. When a base station configures a terminal for repeated transmission of a PUSCH, consecutive symbols to which actual PUSCHs are assigned may be configured as one hop. In this case, the number of symbols configuring one hop may be variable 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 of the repeatedly transmitted PUSCH (symbol 10 of the first slot) 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 yet 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. Since consecutive symbols included in different slots are considered as one hop, DMRS overhead can be reduced compared to when one hop is composed of only symbols within the same slot. However, the number of hops may increase due to the inclusion of ineffective symbols within a slot, which may increase DMRS overhead when DMRS is to be assigned to each hop. However, in a situation where the channel delay spread and channel variation on the time axis within a slot are not significant, 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 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 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] Consecutive PUSCH symbols may be configured as one hop based on the slot boundary. Referring to FIG. 24, four consecutive symbols (symbols 10 to 13 in the first slot) from the start symbol of the repeatedly transmitted PUSCH (symbol 10 in the first slot) 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, which is scheduled in slot units and sets transmission units, and is effective in terms of compatibility.

[0174] One frequency hop may be composed of a predetermined number of symbols. In this case, the predetermined 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 predetermined number of symbols, one hop may be composed of a number of consecutive symbols that is smaller than the predetermined number of symbols. In this case, the predetermined number may be a value set by the base station to the terminal. The predetermined number 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 ineffective 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. 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 repetition transmission type B is applied, symbol 10 of the second slot is a PUSCH with a length of one symbol and therefore does not need to be transmitted. In this case, the first hop and the third hop may be transmitted using the same frequency domain resource. As another example, the predetermined specific number may be any one of divisors of the total number of PUSCH symbols to be repeatedly transmitted. The total number of actual PUSCH symbols is N, where N may be a natural number rather than a decimal number. The specific 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.Furthermore, if a PUSCH of one symbol exists after a hop is formed with a specific number of consecutive symbols, the PUSCH of one symbol may be dropped. Specifically, the specific number of symbols may be i) the largest number among the divisors of N excluding 1 and N. By determining the largest number as the number of symbols forming one hop, the PUSCH can be transmitted over a longer time domain using the same PRB, thereby extending coverage. Referring to FIG. 26(a), when the total number of symbols (N) of the actual PUSCH is 15, 5, which is the largest number among the divisors of 15 excluding 1 and 15, may be determined as the number of symbols forming one hop. That is, the UE can form one hop with five PUSCH symbols that are consecutive or non-consecutive in time order from the symbol (symbol 10 of the first slot) at which the repeatedly transmitted PUSCH begins. ii) The specific number of symbols may be the smallest 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 accordingly, hop transmissions on other PRBs can be performed more frequently in a short time domain. Referring to FIG. 26(b), when the total number of symbols (N) of the actual PUSCH is 15, 3, which is the smallest divisor of 15 excluding 1 and 15, may be determined as the number of symbols constituting one hop. That is, the UE can configure three PUSCH symbols, which may be consecutive or non-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, symbols 6 and 10 of the second slot are PUSCHs with a length of one symbol and may not be transmitted. In other words, after one hop is configured with a specific number of symbols, regardless of whether they are consecutive or not, a PUSCH with a symbol length of one that does not have any consecutive symbols may not be transmitted.

[0175] The base station can set (instruct) a specific unit in which frequency hopping can be performed to the base station. That is, PUSCH symbols included in the specific unit can constitute one hop, and frequency hopping can be performed based on the boundary of the specific unit. The specific unit can be at least one of a symbol set, a slot set, or a symbol set determined by the nominal PUSCH or a slot set determined by the 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 a symbol set by grouping N symbols starting from the first symbol of the radio frame. The scheduled repeatedly transmitted 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 odd-numbered symbol sets may be transmitted on the first PRB, and the PUSCH included in even-numbered symbol sets may 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 a symbol set by grouping N symbols starting from the first symbol for which the nominal PUSCH is scheduled. In this case, the base station may set (instruct) a natural number (K) to the terminal for adjusting the number of symbols constituting the symbol set. The terminal may generate a symbol set by grouping N*K symbols starting from the first symbol for which 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. PUSCHs included in odd-numbered symbol sets may be transmitted on a first PRB, and PUSCHs included in even-numbered symbol sets 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 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.

[0179] When the specific unit is a slot set determined by the nominal PUSCH, the base station can configure (instruct) the terminal to configure the number (N) of slots constituting the slot set. The terminal can generate a slot set by grouping N slots starting 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, 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 defined as 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, there are N slots where the nominal PUSCH is scheduled but all the nominal PUSCH symbols are excluded due to invalid symbols. 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 of the actual PUSCH. The actual PUSCH may be one or more actual PUSCHs that are repeatedly transmitted. That is, when repeated transmission of PUSCH is configured for the terminal from the base station, frequency hopping may be determined based on the actual PUSCH. In this case, an 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 symbols in the time domain. If the number of symbols of the longest PUSCH is N, PUSCH symb,max Then, the number of symbols that make up 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 can 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 base station configures the UE to transmit a PUSCH, the UE may determine frequency hopping based on the actual PUSCH. The shortest number of consecutive symbols is N. PUSCH symb,min Then, the number of symbols that make up the first hop and the second hop 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 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 repeatedly transmitted PUSCH is mapped according to an embodiment of the present invention.

[0186] The terminal can determine the location of the DMRS symbol by considering all or some of the consecutive PUSCH symbols constituting the combined PUSCH as one transmission group. In this case, the terminal can 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 configure additional DMRS symbols, the base station can configure the number of additional DMRS symbols in the terminal. The location of the additional DMRS symbol may be determined according to the PUSCH mapping type. One transmission group may consist of consecutive PUSCH symbols or hops. Referring to FIG. 27(a), the number of symbols in each of the combined PUSCH #1, combined PUSCH #2, and combined PUSCH #3 transmission groups may be 8, 5, and 2, respectively. The terminal can map the additional DMRS to the symbol location 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 by a higher layer. For example, if the number of additional DMRS symbols is 0, DMRS is mapped only 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 need not be transmitted.Referring to Figure 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. That is, the DMRS symbol may be positioned in the same way as when frequency hopping is not configured (see Figure 27(a)).

[0187] The following describes a new method for repeating PUCCH transmission to solve the coverage problem (the problem of limited UL symbols available for repeat transmission) that occurs when repeating PUCCH transmission is performed. The PUCCH format used for repeating PUCCH transmission described below may be PUCCH format 1, 3, or 4, which consists of four 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] The PUCCH may be repeatedly transmitted regardless of slot boundaries. That is, the PUCCH may be repeatedly transmitted in one slot or multiple slots. In other words, the PUCCH may be repeatedly transmitted in symbols including slot boundaries. The terminal may determine the time domain (interval) in which the nominal PUCCH is transmitted based on the number of PUCCH symbols and the number of PUCCH repetitions 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 repetition transmission type B, to ensure PUCCH repetition 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 following the symbol available for PUCCH transmission. 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 with fewer than four symbols. Therefore, the terminal must combine each actual PUCCH to generate a combined PUCCH having a length of at least four symbols. This is because the PUCCH format used for repeated transmission of PUCCH must be configured with 4 to 14 symbols. For example, if the length of the first actual PUCCH is less than four, and there is a second actual PUCCH adjacent to the first actual PUCCH in the time domain, the first and second actual PUCCHs may be combined. Here, "adjacent" means consecutive, meaning 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.Actual PUCCH #3 and actual PUCCH #4 are not adjacent because there are two invalid symbols (symbols 4 and 5 in the second slot) between them. 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 the shorter of actual PUCCH #1 and actual PUCCH #3. Actual PUCCHs consisting of three or fewer symbols may be dropped, but may be transmitted without being dropped by combining. Furthermore, combining short actual PUCCHs can reduce PUCCH DMRS overhead and increase data transmission rates. 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 the longer of actual PUCCH #1 and actual PUCCH #3. Selecting and combining the longer actual PUCCH allows PUCCHs to be transmitted using longer time resources, which is effective for coverage extension. iii) Of two adjacent actual PUCCHs, the earlier actual PUCCH may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #1, which is earlier in time, of actual PUCCH #1 and actual PUCCH #3. This allows PUCCH transmission to be performed over a longer period starting from the earlier time resource, thereby achieving the effects of coverage extension and reducing delay for UCI transmission including HARQ-ACK. iv) Of two adjacent actual PUCCHs, the later actual PUCCH may be selected. Referring to FIG. 28, actual PUCCH #2 may be combined with actual PUCCH #3, which is later in time, of actual PUCCH #1 and actual PUCCH #3. By combining the later actual PUCCH, PUCCH transmission including UCI that is not delay-sensitive can be performed over a longer time resource, thereby achieving coverage extension.

[0191] The length of a 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 form a combined PUCCH of more than 14 symbols. In other words, if the actual PUCCH selected according to i) to iv) above is the second actual PUCCH and the first actual PUCCH and the second actual PUCCH are combined to form a combined PUCCH of more than 14 symbols, another adjacent third actual PUCCH may be selected to be combined with the first actual PUCCH. 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 previously set number of symbols. The pre-set number of symbols may be a value that the base station sets to the terminal. The set number of symbols 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 example, 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 may transmit the PUCCH to the base station on a resource including a slot boundary where the number of symbols is not limited. However, if the number of symbols is between 4 and 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 such a case, since the existing PUCCH format is configured only with 14 or fewer 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 a PUCCH configured in the form of the extended PUCCH format to the base station.In the existing PUCCH format 1, a DMRS symbol and a subsequent symbol for transmitting UCI are consecutive, so 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 DMRS was mapped in the existing PUCCH format 1, DMRS is additionally mapped to the symbols consecutive to the one symbol. A PUCCH consisting of 16 symbols may have a structure in which one symbol for DMRS and one symbol for transmitting UCI are further added to the existing PUCCH format 1. In an extended PUCCH format that is a partial modification of the existing PUCCH format 3 or PUCCH format 4, the position of the symbol to which DMRS is mapped may be determined depending on the number of increased symbols. For example, if one to three symbols are added, the added symbols may be configured by being mapped in the order of UCI symbol, DMRS symbol, and 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, and 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 same configuration as for PUCCH format 3 or PUCCH format 4, which is configured with 4 to 14 symbols, may be applied to the added symbols.

[0192] The base station may configure a resource region for transmitting the PUCCH to be repeatedly transmitted, where 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 related to a slot index. In this case, the slot indicated by the slot index may be a slot for which multiple start symbols and multiple lengths are configured as described above. In this case, the first repeated PUCCH may be transmitted in the first slot, and the second repeated PUCCH may be transmitted in the second slot. On the other hand, if information about the slot index is not configured, the first repeated PUCCH may be transmitted in the first slot determined based on the K1 value, and the second repeated PUCCH may be transmitted in the 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 after the first slot in which PUCCH transmission is possible. That is, if the slot immediately following the first slot does not include an UL resource available for PUCCH transmission, the second PUCCH may be transmitted in a slot including an UL resource. As described above, the K1 value may be a value indicated by the DCI.

[0193] A base station may configure multiple 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 from 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 consecutive symbol interval among the symbols usable for PUCCH transmission. Referring to FIG. 29, the base station may configure the terminal to repeatedly transmit the PUCCH in two slots by setting the start symbol (S) to 4 and the length (L) to 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 the 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 repeated PUCCH may be transmitted on symbols 10 to 13, which are the longest consecutive symbols among the consecutive symbols usable for PUCCH transmission within the set symbol interval. If flexible symbols are also usable for PUCCH transmission, the first repeated PUCCH may be transmitted on symbols 8 to 13. Similarly, the second repeated PUCCH may be transmitted on symbols 6 to 10 in the second slot. On the other hand, if there are no symbols usable for PUCCH transmission within a specific slot or the usable symbol interval is less than four symbols, the specific slot is not used for PUCCH repeated transmission. That is, the number of PUCCH repeated transmissions is not subtracted.

[0194] PUCCH repetition may be performed simultaneously on inter-slots and intra-slots. When a base station configures a terminal with PUCCH repetition on inter-slots and PUCCH repetition on intra-slots, a PUCCH resource for intra-slot repetition and a PUCCH resource for inter-slot repetition may be configured. Alternatively, additional PUCCH resources may be configured in addition to the PUCCH resources configured for intra-slots. That is, the PUCCH transmitted in the intra-slot is the first PUCCH to be repetitively transmitted, and an intra-slot resource for the second PUCCH may be configured. In this case, the start position of the second intra-slot resource 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 set 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 repetitively transmitted in inter-slots. 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] Hereinafter, a frequency hopping method for obtaining diversity gain when PUCCH repeated transmission is performed to solve the coverage problem will be described.

[0196] The UE may determine a frequency hopping boundary for performing PUCCH repetition transmission based on a specific boundary. Information for determining the specific boundary is as follows: i) The specific boundary may be determined based on the boundary of PUCCH repetition transmission. The UE may transmit each PUCCH to be repeatedly transmitted using frequency hopping. Referring to FIG. 28, the hopping boundary may be the boundary of a nominal PUCCH, an actual PUCCH, or a combined PUCCH. PUCCH may be repeatedly transmitted by hopping for one nominal PUCCH, one actual PUCCH, or one combined PUCCH. Referring to FIG. 29, the UE may transmit PUCCH repetition #1 of the first slot and PUCCH repetition #2 of the second slot on different frequency regions using frequency hopping. Referring to FIG. 30, the PUCCH repetition transmission boundary between inter-slots and intra-slots may be the frequency hopping boundary. The UE 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 and transmitted on the same frequency region as the inter-slot repeat transmission PUCCH of the second slot. Alternatively, the intra-slot repeat transmission PUCCH of the second slot may be configured with the same hop and transmitted on the same frequency region as the inter-slot repeat transmission PUCCH of the first slot. 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, or an invalid symbol. Symbols available for consecutive / non-consecutive PUCCH repeat transmission up to the slot boundary, a semi-static DL symbol, or an invalid symbol may be configured with the same hop.In other words, symbols usable for consecutive / non-consecutive PUCCH repetitions before a slot boundary, a semi-static DL symbol, or an invalid symbol and symbols usable for consecutive / non-consecutive PUCCH repetitions thereafter may be configured as different hops. Referring to FIG. 28, actual PUCCH #1, actual PUCCH #2, and actual PUCCH #3 configured with resources ahead of 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 usable for PUCCH repetitions 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. Referring 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 repeated transmission PUCCH in the first slot may be configured as the first hop, and the intra-slot repeated transmission PUCCH and the inter-slot repeated transmission PUCCH in 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 the number of symbols that have already been set. That is, each of the multiple hops may be configured with the same number of symbols. The number of symbols that have already been set may be acquired based on PUCCH configuration information set by the base station. i) The hops may be configured with values ​​that are obtained by equally dividing the total number of symbols of the actual PUCCH that are 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 that make up the second hop is 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 in the actual PUCCH. Referring to FIG. 28, since the total number of symbols in the actual PUCCH is 15, the first hop may be composed of 7 symbols (symbol 10 in the first slot to symbol 2 in the second slot), and the second hop may be composed of 8 symbols (symbols 3, 6 to 10, 12, and 13 in 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 in the first slot), and the second hop may be composed of 5 symbols (symbol 6 to symbol 10 in 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 in the first slot, symbols 6 and 7 in the second slot), and the second hop may be composed of 6 symbols (symbol 8 to symbol 13 in the second slot). Alternatively, if the length of consecutive symbols included in one hop is two or less, two or less consecutive symbols may be included in another hop. In this case, the other hops may include symbols adjacent to the two or less consecutive symbols and may be hops that can be transmitted in the same frequency region. Referring to FIG. 30, symbols 6 and 7 of the second slot of the first hop may be included in and transmitted as the second hop. ii) One hop can 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 two (actual PUCCH #2, #3, #6). Therefore, one hop may be configured with two symbols. Referring to FIG. 29, the minimum number of consecutive symbols is four (PUCCH repetition #1). Therefore, the first hop may be configured with four symbols (symbols 10 to 13 of the first slot), and the second hop may be configured with four symbols (symbols 6 to 9 of the second slot). If the first hop and the second hop are configured 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 consist of 4 symbols (symbols 10 to 13 of the first slot), the second hop may consist of 4 symbols (symbols 6 to 9 of the second slot), and the third hop may consist 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 consist of six symbols (symbol 10 of the first slot to symbol 1 of the second slot), the second hop may consist of six symbols (symbols 2, 3, 6 to 9 of the second slot), and the third hop may consist 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 pre-configured symbols may be the number of initially configured PUCCH symbols (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 pre-configured symbols may be the number of PUCCH symbols (4 in FIG. 30). The first hop may consist of four symbols (symbols 10 to 13 of the first slot), the second hop may consist of four symbols (symbols 6 to 9 of the second slot), and the third hop may consist of four symbols (symbols 10 to 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. 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 can 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 longest consecutive symbols. min(floor(N 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 PUCCH / 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 even division of 8, can 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 can be the number of symbols constituting one hop.

[0198] If the number of consecutive symbols is less than the number of symbols that make up 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 for 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 configured so as not to exceed a pre-set length. That is, the PUSCH transmitted on resources including slot boundaries may be transmitted on resources having a pre-set number of symbols or less. The pre-set length may be a value configured by the base station to the terminal. Alternatively, the pre-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 may transmit a PUSCH with an unlimited number of symbols. In this case, the position of the DMRS included in the PUSCH may be configured by the base station. For example, if the length of resources including slot boundaries is 14 symbols or less, the DMRS may be mapped in the same manner as the existing PUSCH structure. If 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. That is, when the length of a resource including a slot boundary is 15 to 28 symbols and PUSCH mapping type B is applied, a front-loaded DMRS may be mapped to the first symbol (i.e., the 15th symbol) of the symbols exceeding 14. 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 applied to the symbols exceeding 14 symbols in the same way to map the additional DMRS.

[0202] The base station may configure the terminal to repeatedly transmit the PUSCH on resources including a 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 reference for repeated transmission. Referring to FIG. 31, the PUSCH may be repeatedly transmitted on six symbols including the slot boundary. If six 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 an existing slot boundary, and may be defined when the PUSCH is transmitted on resources including an existing slot boundary. Referring to FIG. 32, the base station may configure the terminal to repeatedly transmit a PUSCH from symbol 12 of slot n-1 up to a length of six symbols over two slots. In this case, the first symbol of the repeatedly transmitted PUSCH (symbol 12 of slot n-1) can be the start point of the virtual slot boundary. The PUSCH can be transmitted with the set number of repeated transmissions. That is, the symbol at which the PUSCH transmission starts can be the first symbol of the virtual slot. The maximum number of symbols constituting a virtual slot can be equal to or greater than 14 for a normal CP and 12 for an extended CP.

[0203] In order to improve the coverage of the PUCCH and the PUSCH, 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, a DMRS included in a first PUCCH that is repeatedly transmitted is used for channel estimation for decoding the first PUCCH, and a DMRS included in a second PUCCH that is repeatedly transmitted is used for channel estimation for decoding the second PUCCH. That is, the DMRS included in different PUCCHs are 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 DMRSs included in different PUCCHs / PUSCHs (hereinafter referred to as joint channel estimation) will be described. For convenience of explanation, the method described below will be described based on the PUCCH, but it is obvious that it can also be applied to the PUSCH.

[0205] Joint Channel Estimation Conditions

[0206] Same starting PRB index: The starting positions of PRBs to which DMRSs included in different PUCCHs that are repeatedly transmitted 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 must 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 repeatedly transmitted first PUCCH and the second DMRS included in the second PUCCH may be mapped to different symbols and transmitted. That is, the first DMRS may be mapped to one of the symbols scheduled for transmission of the first PUCCH, and the second DMRS may be mapped to 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 met. The base station can combine the first DMRS and the second DMRS and perform channel estimation, and receive the repeatedly transmitted first PUCCH and second PUCCH based on the channel estimation result.

[0213] Joint Channel Estimation Method

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

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

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

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

[0218] - number of symbols: the number of symbols used to transmit the PUCCH in the time domain. PUCCH formats 0 and 2 are formats for transmitting the PUCCH using one or two symbols. PUCCH formats 1, 3, and 4 are formats for transmitting the PUCCH using four to fourteen symbols. PUCCH formats 0 and 2 may be referred to as short PUCCHs, and PUCCH formats 1, 3, and 4 may be referred to as long PUCCHs.

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

[0220] - number of PRBs: The number of PRBs used to transmit the PUCCH in the frequency domain. PUCCH formats 0, 1, and 4 are formats for transmitting the PUCCH with one PRB. PUCCH format 2 is a format for transmitting the PUCCH with 1 to 16 PRBs. PUCCH format 3 is a format for transmitting the 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 UCI bits (O bits) 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 per 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), where Q may represent the modulation order used for PUCCH transmission. 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, can adjust the number of PRBs so that the code rate is equal to or lower than the maximum code rate. That is, among the possible number of PRBs (M), the minimum number of PRBs that satisfies O / (M*N*Q)≦maximum code rate may be selected. In this case, the minimum number 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 is defined as N sc,ctrl and N symb-UCI It can be given 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. For PUCCH format 2, N sc,ctrl is 8, and in PUCCH format 3, N sc,ctrl may be 12. In PUCCH format 2, N symb-UCI is the number of symbols used for PUCCH transmission, and in PUCCH format 3, N symb-UCI may be the number of symbols used for PUCCH transmission excluding the symbols to which DMRSs are mapped.

[0223] Fig. 34 shows that PUCCHs repeatedly transmitted according to an embodiment of the present invention are transmitted with the same symbol length (number of symbols). Fig. 35 to Fig. 37 show that PUCCHs repeatedly transmitted according to an embodiment of the present invention are 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 may be the same as the length of the resource in which PUCCH1 is transmitted. PUCCH0 and PUCCH1 may occupy the same PRB. The number of PRBs may be determined as described above. PUCCH0 and PUCCH1 may each include a symbol in which a 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). In addition, the base station may receive UCI transmitted on 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 may be different from the length of the resource in which PUCCH1 is transmitted. PUCCH0 may be transmitted over 4 symbols, and PUCCH1 may be transmitted over 11 symbols. Since the resource lengths for transmitting PUCCH0 and PUCCH1 are different, the number of PRBs occupied by PUCCH0 and PUCCH1 may differ. For example, PUCCH0, which is transmitted over 4 symbols, may occupy a greater number of PRBs than PUCCH1, which is transmitted over 11 symbols. The number of PRBs may be determined using the method described above. For overlapping PRBs occupied by PUCCH0 and PUCCH1, DMRSs can be combined to perform channel estimation. However, for non-overlapping PRBs, DMRS for PUCCH1 is not transmitted, so joint channel estimation is not possible. Therefore, the base station performs different channel estimations depending on the PRBs, which may result in errors in the channel estimation value. A method for overcoming such errors will be described below. Also, the method described below may not be applicable when PUCCHs are repeatedly transmitted using 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 that is repeatedly transmitted may be the same as the starting PRB index of the PUCCH that is 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 that is repeatedly transmitted first is determined as the starting PRB index of the PUCCH that is repeatedly transmitted, there is a problem in that joint channel estimation is possible for PRBs corresponding to low frequency regions but not for PRBs corresponding to high frequency regions. ii) The last PRB index of each PUCCH that is repeatedly transmitted may be the same as the last PRB index of the PUCCH that is repeatedly transmitted first. The last PRB index is the index of the PRB that corresponds 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 Figure 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 PUCCH to be transmitted is determined as the last PRB index of the repeatedly transmitted PUCCH, there is a problem in that joint channel estimation is possible for PRBs corresponding to a high frequency region but not for PRBs corresponding to a 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 Figure 37, PUCCH0 and PUCCH1 may have different starting symbol indexes. In this case, the center of the frequency domain resources constituting PUCCH0 and the center of the frequency domain resources constituting PUCCH1 may be set to coincide as much 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 can 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, if 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 from 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 PUCCHs repeatedly transmitted in non-overlapping PRB regions, and only separate estimation is possible.

[0232] Method 2

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

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

[0235] i) The same number of PRBs as that set in the first PUCCH may be set in the remaining PUCCHs. That is, the number of PRBs to be allocated 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 determined number of PRBs may be independent of the number of symbols allocated to each PUCCH to be repeatedly transmitted. Referring to FIG. 38, the number of PRBs to be allocated to PUCCH0 may be determined based on four symbols used for transmitting PUCCH0. The same number of PRBs as that allocated to PUCCH0 may be allocated to PUCCH1. At this time, since the number of PRBs is determined taking into account the maximum coding rate for PUCCH0, it may not match the maximum coding rate for PUCCH1. For example, if a large number of symbols are allocated to the first PUCCH to be repeatedly transmitted, the maximum coding rate may be met even if the number of PRBs is small. Therefore, if the number of symbols of the PUCCHs to be repeatedly transmitted after the first transmission is small, the maximum coding rate may not be met. ii) As described above, the same number of PRBs as that set in the first repeatedly transmitted PUCCH may be set in the remaining repeatedly transmitted PUCCHs. In this case, a coding rate may be calculated for each repeatedly transmitted PUCCH. If the calculated coding rate is greater than the maximum coding rate, the terminal may not transmit the corresponding PUCCH. Resources set in PUCCHs that are not transmitted may be used for repeatedly transmitting other adjacent PUCCHs. iii) The number of PRBs set in the PUCCH to which the fewest symbols are allocated 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 allocated to each repeatedly transmitted PUCCH and determine the number of PRBs based on the PUCCH to which the fewest symbols are allocated. The determined number of PRBs may be applied regardless of the number of symbols allocated to the repeatedly transmitted PUCCH.Referring to FIG. 38, four symbols (three symbols used for UCI transmission) may be allocated to PUCCH0, and 11 symbols (nine symbols used for UCI transmission) may be allocated to PUCCH1. Therefore, the number of PRBs in PUCCH0 to which the fewest number of symbols is allocated may be the number of PRBs in PUCCH1. In this case, when determining the fewest number of symbols, symbols to which DMRSs are mapped may be excluded, and only symbols used for UCI transmission may be used. iv) The largest number of PRBs among those 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 of M0 and M1 may be selected. PRBs corresponding to the selected value may be configured in PUCCH0 and PUCCH1. v) The same number of PRBs may be configured in each PUCCH that is repeatedly transmitted. That is, when the base station schedules repeated transmission of the PUCCH, it 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 Figure 39, the number of PRBs that does not exceed the maximum code rate may be calculated for each PUCCH that is repeatedly transmitted. When the number of PRBs required for transmitting PUCCH0 is M0 and the number of PRBs required for transmitting PUCCH1 is M1, the PRB corresponding to the larger value of M0 or M1 may be used for DMRS transmission. That is, the DMRS included in PUCCH1 may be transmitted using M0 PRBs. In other words, the DMRS included in each PUCCH that is repeatedly transmitted may all be transmitted using the same number of PRBs. In this case, UCI may be transmitted on the PRBs required for each PUCCH transmission. UCI included in PUCCH1 may be transmitted using M1 PRBs.

[0239] ii) The number of PRBs for DMRS transmission included in some of the repeatedly transmitted PUCCHs may be the same. In this case, some of the PUCCHs may be temporally adjacent PUCCHs. For example, the number of PRBs set to be the same may be the larger of the numbers 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 (the window for DMRS extension). In this case, the number of PRBs to which DMRSs are mapped included in PUCCH0 and PUCCH1 may be the larger 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 transmit power of the PUSCH may be determined as shown in Table 4.

[0242] [Table 4]

[0243] That is, when the terminal transmits the PUSCH on the active UL BWP (b) of the carrier (f) of the serving cell (c), the transmit 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 the 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 (number of 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] A method for maintaining constant PUSCH transmit power for joint channel estimation using DMRS will be described below.

[0254] PUSCH transmit power determination method

[0255] i) The terminal can calculate the transmit power of the PUSCH that is transmitted first repeatedly. RE may be calculated using the number of symbols transmitting the first repeatedly transmitted PUSCH. 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. Specifically, N 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 transmit power of each of the repeatedly transmitted PUSCHs, and the largest value among the calculated transmit powers may be the transmit 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 is applied to PUCCH formats 2, 3, and 4, may be applied when the number of UCI bits is less than or equal to 11 bits, and in this case, K1 in Equation 8 may be 6. HARQ-ACK (i)+O SR (i)+O CSI (i) may be the number of bits of UCI transmitted by PUCCH, where N denotes the number of REs. 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, and in this case, K2 in Equation 9 may be 2.4. 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 PUCCH, where N denotes the number of REs. RE (i) may be calculated as in Equation 10.

[0268]

number

[0269] N sc,ctrl and N symb-UCI is as described above, and the explanation will be omitted. According to Equation 10, N RE is N symb-UCIThe transmit power may be a value proportional to . That is, if the number of symbols for transmitting each of the repeatedly transmitted PUCCHs is different, the transmit power may be determined differently. The transmit power of the PUCCH may be determined according to the number of symbols for transmitting the PUCCH. Therefore, when the number of symbols for transmitting each of the repeatedly transmitted PUCCHs is different, a method for determining the same transmit power for joint channel estimation of the DMRS included in each PUCCH is required.

[0270] PUCCH transmission power determination method

[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 transmit power of each PUCCH to be repeatedly transmitted, and the largest value among the calculated transmit powers may be the transmit power of all PUCCHs to be repeatedly transmitted.

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

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

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

[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 a base station configures inter-slot hopping of PUSCH repetition type-A in a terminal, the frequency hopping flag may 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 in one slot. That is, inter-slot hopping is not performed regardless of the frequency hopping flag. In other words, if inter-slot hopping is configured and the number of repetitions of PUSCH is 1, 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 inter-slot hopping of PUSCH repetition type-B in the terminal, the frequency hopping flag may indicate whether to perform inter-slot hopping to the terminal. However, when repeatedly transmitted PUSCHs are transmitted only on the same slot, inter-slot hopping is not performed regardless of the frequency hopping flag. In other words, when inter-slot hopping is configured and repeatedly transmitted PUSCHs are transmitted only on the same slot, whether to perform inter-slot hopping may be determined depending on the value of the frequency hopping flag.

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

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

[0281] How hops are 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 consist of floor(N / 2) consecutive symbols from the symbol indicated by the index of the starting symbol, and the second hop may consist of N-floor(N / 2) consecutive symbols after the last symbol of the first hop. The UE 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 UE determines four hops when intra-slot hopping is configured.

[0284] 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. First, let N be 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 by floor(N / 2), and N 34 may be calculated on N-floor(N / 2). 12 Based on this, the number of symbols included in the first hop (N1) and the number of symbols included in the second hop (N2) may be determined. 34 The number of symbols included in the third hop (N3) and the number of symbols included in the fourth hop (N4) may be determined based on the above equation. Specifically, N1 to N4 may be calculated as shown 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 to fourth hops can differ by up to one symbol.

[0291] For example, if a terminal transmits two uplink channels, each 14 symbols long, 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 consist of seven symbols starting from the first symbol, and the second hop may consist 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 consist of three symbols starting from the first symbol, the second hop may consist of the next four symbols, the third hop may consist of the next three symbols, and the fourth hop may consist 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 frequency hopping can be performed at the same boundary, which is effective in terms of multiplexing between two uplink channels of the same length that start from the same symbol.

[0292] As another example, the first uplink channel may be seven symbols long starting from the first symbol of the slot, and the second uplink channel may be 14 symbols long 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 four hops. The first hop of the first uplink channel may be three symbols starting from the first symbol, and the second hop may be the remaining four symbols. The boundary between two hops of the first uplink channel may be between the third and fourth symbols of the slot. In other words, the boundary between 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 three symbols starting from the first symbol, the second hop may be the next four symbols, the third hop may be the next three symbols, and the fourth hop may be the next four symbols. Therefore, the second uplink channel may have 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, so that frequency hopping can be performed at the same boundary, which is effective in terms of multiplexing between two uplink channels of different lengths that start from the same symbol.

[0293] When the uplink channel is a PUSCH and the PUSCH is transmitted in up to four hops, each hop may include at least one DM-RS symbol. For example, when the PUSCH is composed of 14 symbols and transmitted in four hops, the first hop may be composed of three symbols, the second hop may be composed of four symbols, the third hop may be composed of three symbols, and the fourth hop may be composed of four symbols, and each hop may include a symbol to which at least one DM-RS is mapped. In this case, if the PUSCH mapping type is PUSCH mapping type B, the DMRS may be mapped to the first symbol of each hop. However, if the PUSCH mapping type is 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 or fourth symbol of the slot. In this case, whether the DMRS is mapped to the third or fourth symbol may be indicated by the PBCH. For example, when 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 a symbol to which a 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 within the overlapping hop. The position of the symbol to which the DMRS is mapped in a 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 a 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, when the PUSCH is configured with 14 symbols and the mapping type is PUSCH mapping type A, the DMRS may be 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, there is no fourth symbol 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 lengths of other hops of length 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. Alternatively, the terminal may regard the lengths of each hop determined according to Table 5 as the hop length 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, depending on the number of symbols N, the number of symbols included in the first to fourth hops may differ by up to one symbol. Similar to method i) above, method ii) is also effective in multiplexing two uplink channels of the same length that start from the same symbol. Method ii) is also effective in multiplexing two uplink channels of different lengths that start from different symbols. For example, there may be a first uplink channel of length 5 that starts from the third symbol of a slot, and a second uplink channel of length 9 that starts 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 consist of the third and fourth symbols of a slot, and the second hop may consist 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. Therefore, the second uplink channel may include the same boundary 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 therefore may include the same boundary as the first uplink channel. Therefore, frequency hopping may be performed at the same boundary.

[0299] When a terminal transmits a PUSCH over a maximum of two hops, if the PUSCH and the PUCCH overlap on a certain symbol, the UCI of the PUCCH may be multiplexed onto the PUSCH and transmitted. In this case, the UCI may be divided into two parts according to the type of UCI, with one half being multiplexed onto the first hop and the other half being multiplexed onto the second hop. The UCI type may be HARQ-ACK, CSI part 1, or CSI part 2. For example, 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 PUSCH layers, 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 to the second hop based on (2). CSI part 1 and CSI part 2 may also be multiplexed to 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 onto the PUSCH and transmitted.

[0302] i) The UE may divide UCI into four parts and multiplex them into four hops of the PUSCH, respectively. In this case, the 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 using Equation 14 or Equation 15.

[0303]

number

[0304]

number

[0305] HARQ-ACK is G according to Equation 14 or Equation 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, respectively. CSI part 1 and CSI part 2 may also be multiplexed to each hop in the same manner.

[0306] ii) The UE may divide the UCI and multiplex it into four hops of the PUSCH. In this case, the UCI may be divided into two parts depending on 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. In other words, the UCI may be divided into two parts, and each of the divided UCI parts may be repeatedly transmitted over 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 for the reuse of the method for determining the UCI size based on two hops defined in the existing NR system, and is also effective in terms of reliability, as the UCI can be repeatedly transmitted over two different hops.

[0309] iii) Even when the PUSCH is configured to be transmitted over four hops, the UE can divide the UCI and transmit it over two hops. That is, the UCI is multiplexed over two hops and transmitted, and does not need to be multiplexed over the remaining two hops. The UE can reuse the method for determining the UCI size over two hops defined in the existing NR system and does not need to perform repeated transmission. Specifically, the method for selecting two hops from the 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 on the third and fourth hops, which are the latest in time, and does not need to multiplex UCI on the first and second hops, which are the earliest in time. The UE can secure time for multiplexing UCI onto the PUSCH. Additional processing time may be required for the UE to multiplex UCI onto the PUSCH. Compared to iii-a), iii-b) has ample processing time and is easy to implement because UCI is multiplexed on later hops.

[0312] iii-c) The terminal can 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 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 over the first and third hops, but not over the second and fourth hops. Alternatively, the terminal can select two even-numbered hops. That is, the terminal can multiplex and transmit UCI over the second and fourth hops, but not over the first and third hops.

[0314] iii-e) The terminal can select the two hops with the greatest distance in the frequency domain. The distance in the frequency domain can be calculated as the difference between the lowest PRBs of each hop. For example, if 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 distance in the frequency domain between the i-th hop and the j-th hop is |X i -X j | is calculated, and based on this value, the two hops with the greatest distance may be selected. The terminal can multiplex and transmit UCI to the two selected hops, and does not need to 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 include a large number of symbols. For example, if the PUSCH includes 14 symbols and the numbers of symbols included in the first, second, third, and fourth hops are 3, 4, 3, and 4, the terminal can multiplex and transmit UCI on the second and fourth hops, but not on the first and third hops.

[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. This is 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 insufficient resources after the symbol to which the DMRS of the hop is mapped.

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

[0318] A method of multiplexing UCI using 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 repeatedly transmitted first PUSCH and the second DMRS included in the repeatedly transmitted second PUSCH 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 a terminal transmits DMRSs on different repeatedly transmitted PUSCHs, phase continuity must be satisfied. That is, the first PUSCH and the second PUSCH may be transmitted in the same beamforming situation. Furthermore, the first PUSCH and the second PUSCH must have the same quasi-co-locate (QCL). Furthermore, the transmit power for transmitting the first PUSCH and the transmit 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 receive the repeatedly transmitted first PUSCH and the second PUSCH based on the channel estimation result.

[0322] Of the repeatedly transmitted PUSCHs, some 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. Therefore, the first hop may include multiple repeatedly transmitted PUSCHs, and the second hop may include other multiple repeatedly transmitted PUSCHs. Referring to FIG. 41(a), 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. Referring 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] UCI included in the repeatedly transmitted PUSCH may be multiplexed and transmitted. In this case, if the repeatedly transmitted PUSCHs are transmitted in different frequency bands (different hops), the UCI cannot obtain frequency diversity. A method for obtaining frequency diversity for the UCI will be described below. The PUSCH repetition described in this specification may have the same meaning as the repeatedly transmitted PUSCH.

[0325] When a PUSCH to be transmitted multiple times is configured in each frequency band (each hop), one PUSCH may be selected for each frequency band. i) The earliest PUSCH in time may be selected in each frequency band (each hop). Referring to FIG. 41(b), a first PUSCH repetition and a second PUSCH repetition may be configured in the first frequency band (first hop), and the earliest first PUSCH repetition in time may be selected. Similarly, when a third PUSCH repetition and a fourth PUSCH repetition are configured in the second frequency band (second hop), the earliest third PUSCH repetition in time may be selected. Therefore, UCI may be multiplexed with the first PUSCH repetition and the third PUSCH repetition and transmitted. ii) The latest PUSCH repetition in time may be selected in each frequency band (each hop). Referring to FIG. 41(b), when the first and second PUSCH repetitions 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 and fourth PUSCH repetitions are configured in the second frequency band (second hop), the fourth PUSCH repetition that is the last in time may be selected. Therefore, UCI may be multiplexed into the second and fourth PUSCH repetitions and transmitted. Compared to multiplexing UCI into earlier PUSCH repetitions, multiplexing UCI into later PUSCH repetitions has the advantage of ensuring sufficient time for UCI multiplexing. In the above methods i) and ii), the PUSCH repetitions containing UCI do not need to be consecutive PUSCH repetitions in time. Therefore, the base station may need to store UCI included in one PUSCH repetition and wait for other PUSCH repetitions. This may require additional hardware for storing UCI. 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), of the first and second PUSCH repetitions configured for the first frequency band (first hop), the second PUSCH repetition that is later in time may be selected. Similarly, the third PUSCH repetition that is earlier in time may be selected for the second frequency band (second hop). Therefore, UCI may be multiplexed into the second and third PUSCH repetitions and transmitted. That is, UCI may be multiplexed into the second and third PUSCHs, which are PUSCHs that are consecutive in time, and transmitted. iv) The base station may configure an index of the PUSCH repetition into which UCI is multiplexed. The terminal may multiplex UCI into the PUSCH repetition determined by the index configured by the base station and transmit the multiplexed UCI.

[0326] DMRS included in PUSCHs that are 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 more data, it is necessary to reduce the number of symbols to which DMRSs are mapped (density) or to repeatedly transmit DMRS-less PUSCHs. The information that the base station configures in the terminal to set the number of symbols to which DMRSs included in PUSCHs are mapped is as follows: Hereinafter, PUSCHs that are 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, which 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 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 symbol positions to which DMRS added according to the number of symbols constituting the PUSCH set by a higher layer is mapped.

[0330] When a PUCCH and a PUSCH overlap in the time domain, the UE may multiplex UCI onto the PUSCH that is located earliest in the time domain among the overlapping PUSCHs, and may not transmit the PUCCH. When UCI is multiplexed onto a PUSCH, to ensure reliability, HARQ-ACK may be mapped to the symbol immediately following the symbol onto which DMRS of the PUSCH is mapped. CSI-part 1 and CSI-part 2 may be mapped after the symbol onto which 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 a PUCCH and a PUSCH bundle overlap, there may be no symbol onto which DMRS is mapped in the PUSCH, and thus UCI may not be multiplexed. Below, a method for ensuring UCI reliability and obtaining PUSCH coverage gain by multiplexing UCI will be described.

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

[0332] The UE can select a PUSCH into which UCI is multiplexed, regardless of whether DMRS is included in the repeatedly transmitted PUSCH. i) UCI ​​may be equally segmented and multiplexed into the repeatedly transmitted PUSCH. The UE may segment UCI to as uniform a size as possible and multiplex it onto all PUSCHs in a PUSCH bundle overlapping with the PUCCH. For example, UCI may be multiplexed only onto PUSCHs in a PUSCH bundle overlapping with the PUCCH. As another example, the UE may multiplex UCI not only onto a PUSCH bundle overlapping with the PUCCH but also onto PUSCH bundles set at other hops in the frequency domain. Multiplexing UCI may be effective in extending coverage through frequency diversity gain in addition to joint channel estimation. ii) UCI ​​may be multiplexed onto 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 the PUCCH. iii) UCI ​​may be multiplexed into as many PUSCHs as configured (instructed) by the base station among the PUSCH bundles overlapping with the PUCCH. The base station may configure (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 configure (instruct) the terminal to set the offset to 1 and the period to 2. The terminal may multiplex UCI into the first and fourth PUSCHs among the PUSCH bundles overlapping with the PUCCH and transmit the multiplexed PUSCH. The base station may also configure (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 configures the terminal with an index of 2, the terminal may multiplex UCI into the third PUSCH among the PUSCH bundles and transmit the multiplexed PUSCH. iv) Among PUSCH bundles overlapping with the PUCCH, UCI may be multiplexed into the earliest PUSCH in the time domain. The UE 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 can multiplex UCI only into a PUSCH bundle including the earliest PUSCH in the time domain among PUSCHs overlapping with the PUCCH. Alternatively, the terminal can multiplex UCI into the same symbol position as the PUSCH bundle including the earliest PUSCH in the time domain among overlapping PUSCHs for all frequency hops. In an embodiment in which UCI is multiplexed into a PUSCH not including DMRS, the terminal can multiplex UCI into a PUSCH without a DMRS symbol according to a new rule. The PUSCH overlapping with the PUCCH in the above i) to iv) can refer to the entire repeated PUSCH including the PUSCH overlapping with the PUCCH in symbol or slot units.

[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 a PUCCH that is repeatedly transmitted and a PUSCH that is repeatedly transmitted 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 Figure 44, a PUCCH that is repeatedly transmitted and a PUSCH that is repeatedly transmitted may overlap in the interval from slot n+2 to slot n+5. In this case, the terminal does not transmit the PUSCH in slots n+2 to n+5 and can transmit only the PUCCH. If a PUSCH in the overlapping interval 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 repeatedly transmitting the PUSCH. A method for solving this problem will be described below.

[0335] When a repeatedly transmitted PUCCH and a repeatedly transmitted PUSCH overlap, the UE can 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, to ensure PUSCH coverage gain, the UE can multiplex UCI included in the PUCCH without dropping the overlapping PUSCH and transmit the 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 because both information to be transmitted (data and UCI) can be transmitted. i) When a PUCCH and a PUSCH overlap, the UE can multiplex UCI included in the overlapping PUCCH into the PUSCH and transmit the PUSCH. Referring to Figure 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 onto a PUSCH and transmit the PUCCH, but 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 onto one PUSCH without subdividing it. That is, the PUSCH into which UCI is multiplexed may be repeatedly transmitted four times. ii) When the PUSCH and the PUCCH overlap, the terminal may multiplex UCI of the PUCCH onto a specific PUSCH. In this case, the specific PUSCH may be predefined between the base station and the terminal or configured to the terminal by the base station. a) The specific PUSCH may be the earliest PUSCH in the time domain among the overlapping PUSCHs. For faster HARQ-ACK feedback, the UE may multiplex UCI only onto 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 the PUSCH that is located earliest in the time domain among the PUSCHs overlapping with the PUCCH and transmitted on a different PRB in the frequency domain. The UE may multiplex UCI onto the PUSCH that is located earliest in the time domain and transmitted on a different PRB for frequency diversity gain for UCI as well as for rapid HARQ-ACK feedback. c) The specific PUSCH may be selected based on information configured or indicated by the base station. For example, if the base station configures / indicates information of index 1, the UE may multiplex UCI onto the PUSCH with index 1 (i.e., the second PUSCH) among the PUSCHs overlapping with the PUCCH. As another example, the base station may configure (instruct) the UE regarding information regarding the start position and length of the PUSCH. If the base station configures / instructs the UE that the start position is 0 and the length is 2, the UE may multiplex UCI onto 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 repeatedly transmitted in one embodiment of the present invention, Figure 46 shows a PUCCH repeatedly transmitted and intra-slot frequency hopping in one embodiment of the present invention, and Figure 47 shows a PUCCH 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, it may be transmitted by frequency hopping for frequency diversity gain.

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

[0339] - Intra-slot frequency hopping

[0340] The UE may divide the PUCCH in a slot configured for PUCCH transmission into two in the time domain and map each of the two divided PUCCHs to two hops for transmission. In this case, the PUCCH may be repeatedly transmitted or not. If the length of the symbols configured for PUCCH 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 UE to repeatedly transmit the PUCCH from slot n to slot 4 and perform intra-slot frequency hopping. In this case, the length of the symbols allocated to the PUCCH in one slot may be 14. The terminal may configure the first hop using 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 using the seven symbols (number of symbols(14)-floor(number of symbols(14) / 2)) following the last symbol configuring the first hop. In this case, the first hop may be transmitted in a first frequency band, and the second hop may be transmitted in a 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 UE 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 UE may map the PUCCHs of slots in which even-numbered PUCCHs are transmitted (i.e., slots with repetition slot indexes 0 and 2) to the first hop. Similarly, the UE may map the PUCCHs of slots in which odd-numbered PUCCHs are transmitted (i.e., slots with repetition slot indexes 1 and 3) to the second hop. In other words, the terminal can transmit PUCCH in slot n and slot n+2 over the first hop, and transmit PUCCH in slot n+1 and slot n+3 over the second hop.

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

[0344] When PUCCH is repeatedly transmitted through frequency hopping, the DMRS of the PUCCH transmitted in the first hop and the DMRS of the 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 through 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 also be applied to PUSCH.

[0345] Frequency-Hopping Method for Joint Channel Estimation

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

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

[0348] i) The UE may maintain the same repeat transmission slot index of the PUCCH repeatedly transmitted for a specific number of slots. The repeat transmission slot index may increase sequentially for each 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 based on the slot of the first PUCCH to be repeatedly transmitted may be determined to be 0. The repeat transmission slot index of the subsequent PUCCHs to be repeatedly transmitted may increase sequentially every M slots. In this case, the slot index may be independent of whether the PUCCH is repeatedly transmitted or not. Referring to FIG. 48, the base station may set N to 4 and M to 2 to the UE and may configure the UE to repeatedly transmit the PUCCH starting from slot n. The UE may determine the repeat transmission slot index of two slots from slot n, i.e., slots n and n+1, to be 0, and the repeat transmission slot index of two slots from slot n+2, i.e., slots n+2 and n+3, to be 1. The PUCCHs of slot n and slot n+1 with a repeat transmission slot index of 0 may be transmitted in the first hop, and the PUCCHs of slot n+2 and slot n+3 with a repeat transmission slot index of 1 may be transmitted in 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, based on the M value (2), slots n and n+1 as repeat transmission slot index 0, slots n+2 and n+3 as repeat transmission slot index 1, and slots n+4 and n+5 as repeat transmission slot index 2. The slot with a repeat transmission slot index of 0 may be transmitted in the first hop, the slot with a repeat transmission slot index of 1 may be transmitted in the second hop, and the slot with a repeat transmission slot index of 2 may be transmitted in 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 UE must repeatedly transmit the PUCCH in four slots and can transmit the PUCCH in the four slots available for PUCCH transmission, i.e., slot n, slot n+2, slot n+3, and slot n+4. That is, the PUCCH in slots with even-numbered repeated transmission slot indices (slot n and slot n+4) may be transmitted in the first hop, and the PUCCH in slots with odd-numbered repeated transmission slot indices (slot n+2 and slot n+3) may be transmitted in the second hop. The UE can set a repetition slot index for M consecutive slots together, regardless of whether the slots are capable of PUCCH transmission. Since the M consecutive slots are set with the same repetition slot index, they can be transmitted in 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 less than M.

[0349] ii) The UE may maintain the same repetition transmission slot index in slots where a specific number of PUCCH repetitions are possible. The UE 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 to be 0. The repetition transmission slot index of subsequent PUCCHs to be repeatedly transmitted may sequentially increase every M slots. Referring to FIG. 50, the base station may set N to 4 and M to 2 to the UE, and may configure the UE to repeatedly transmit PUCCHs 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 can determine the repeat transmission slot indexes of slots n and n+2 as 0, and the repeat transmission slot indexes of slots n+3 and n+4 as 1. Therefore, the terminal can transmit the PUCCHs of slots n and n+2 with a repeat transmission slot index of 0 in the first hop, and the PUCCHs of slots n+3 and n+4 with a repeat transmission slot index of 1 in the second hop.

[0350] For joint channel estimation, PUCCHs need to be transmitted in the same PRB of consecutive slots. For example, referring to Figure 48, PUCCHs configured in two consecutive slots, slot n and slot n+1, are transmitted in the first hop, so DMRSs included in the PUCCHs configured in slot n and slot n+1 can be used for joint channel estimation. Similarly, PUCCHs configured in two consecutive slots, slot n+2 and slot n+3, are transmitted in the second hop, so DMRSs included in the PUCCHs configured in slot n+2 and slot n+3 can be used for joint channel estimation. Referring to Figure 49, PUCCHs configured in two consecutive slots, slot n+2 and slot n+3, are transmitted in the second hop, so DMRSs included in the PUCCHs configured in slot n+2 and slot n+3 can be used for joint channel estimation. However, although the PUCCHs configured for slot n and slot n+4 are transmitted at the first hop, slot n and slot n+4 are not consecutive in the time domain, and therefore the DMRSs included in the PUCCHs configured for slot n and slot n+4 are not used for joint channel estimation. Referring to Figure 50, since the PUCCHs configured for two consecutive slots, slot n+3 and slot n+4, are transmitted at the second hop, the DMRSs included in the PUCCHs configured for slot n+3 and slot n+4 can be used for joint channel estimation. However, although the PUCCHs configured for slot n and slot n+2 are transmitted at the first hop, slot n and slot n+2 are not consecutive in the time domain, and therefore the DMRSs included in the PUCCHs configured for slot n and slot n+2 are not used for joint channel estimation.

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

[0352] Referring to Figure 51, the base station may set N to 4 and M to 2 to the terminal, and may configure the terminal to repeatedly transmit the 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 the PUCCH in four slots, and may transmit the PUCCH in slot n, slot n+3, slot n+4, and slot n+6. Referring to Figure 51(a), the repeated transmission slot index may be set according to i) above. The repeated transmission slot index of slot n and slot n+1 may be set to 0, the repeated transmission slot index of slot n+2 and slot n+3 may be set to 1, the repeated transmission slot index 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, a PUCCH configured for slot n and slot n+4, whose repeat transmission slot index corresponds to an even number, may be transmitted via the first hop, and a PUCCH configured for slot n+3 and slot n+6, whose repeat transmission slot index corresponds to an odd number, may be transmitted via the second hop. Referring to FIG. 51(b), repeat transmission slot indexes may be set according to ii) above. The repeat transmission slot indexes for slot n and slot n+3 may be set to 0, and the repeat transmission slot indexes for slot n+4 and slot n+6 may be set to 1. Therefore, a PUCCH configured for slot n and slot n+3, whose repeat transmission slot index corresponds to an even number, may be transmitted via the first hop, and a PUCCH configured for slot n+4 and slot n+6, whose repeat transmission slot index corresponds to an odd number, may be transmitted via the second hop. According to FIG. 51(a) and (b), the PUCCHs configured for slot n+3 and slot n+4 may be transmitted via different hops.

[0353] Referring to Figure 52, the base station can set N to 8 and M to 2 to the terminal, and can configure the terminal to repeatedly transmit the 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 the PUCCH over eight slots, and can transmit the 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 Figure 52(a), the repeated transmission slot index can be set according to i) 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 in 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 in the second hop. Referring to FIG. 52(b), the repeat transmission slot indexes may be set according to ii) above. The repeat transmission slot index for slot n and slot n+1 may be set to 0, the repeat transmission slot index for slot n+2 and slot n+5 may be set to 1, the repeat transmission slot index for slot n+6 and slot n+8 may be set to 2, and the repeat transmission slot index for slot n+9 and slot n+10 may be set to 3.Therefore, PUCCHs configured in slot n, slot n+1, slot n+6, and slot n+8, which have even-numbered repetition slot indices, may be transmitted in the first hop, while PUCCHs configured in slot n+2, slot n+5, slot n+9, and slot n+10, which have odd-numbered repetition slot indices, may be transmitted in the second hop. Referring to Figure 52, PUCCHs configured in consecutive slots, slot n+5 and slot n+6, may be transmitted in different hops. As shown in Figures 51 and 52, PUCCHs configured in consecutive slots have different repetition slot indices and are transmitted in different hops. Therefore, DMRSs included in PUCCHs configured in consecutive slots cannot be used for joint channel estimation. A method for using DMRSs included in PUCCHs configured in consecutive slots for joint channel estimation will be described below.

[0354] iii) The terminal may set slots capable of joint channel estimation, among a specific number of slots capable of transmitting the PUCCH repeatedly, as the same repetition transmission slot index. The slots capable of joint channel estimation may be consecutive slots in the time domain among the slots capable of transmitting the PUCCH repeatedly. The specific number may be the number of PUCCHs including DMRSs used for joint channel estimation. The terminal may set M consecutive slots available for PUCCH transmission as the same repetition transmission slot index. The repetition transmission slot index of consecutive slots available for PUCCH transmission may increase sequentially every M slots. In this case, if there are fewer than M consecutive slots, the same repetition transmission slot index may be set to consecutive slots less than M. Non-consecutive slots may be set to different repetition transmission indexes. The repetition transmission slot indexes of the earliest and latest slots 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, as configured (instructed) by the base station, is set is 0. 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 also be 0. Thereafter, the repeat transmission slot index of the M slots consecutive from the slot in which PUCCH transmission is possible may be 1. On the other hand, if there are not M consecutive slots, i.e., if there are discontinuous slots, the terminal can determine the consecutive slots after the discontinuous slots. 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 slots 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 groups of two (M=2) consecutive slots in which PUCCH transmission is possible.Since slots n+1 and n+2 are unavailable for PUCCH transmission, there are no slots used for PUCCH transmission consecutive to slot n. Therefore, only slot n may be set to a repetition slot index of 0. The repetition slot index of slot n+3, which is the slot used for the first PUCCH transmission after slot n, may be set to 1. Since slot n+4, which is the slot consecutive to slot n+3, is consecutive, the repetition slot indexes of slots n+3 and n+4 may be set to the same. The repetition slot index of slot n+6, which is the slot used for PUCCH transmission after slot n+4, may be set to 2 (because slot n+5 is unavailable for PUCCH transmission). Therefore, the UE transmits PUCCHs set to slots n and n+6, whose repetition slot indexes correspond to even numbers, in the first hop, and transmits PUCCHs set to slots n+3 and n+4, whose repetition slot indexes correspond to odd numbers, in the second hop. Compared with the description in FIG. 51, since the PUCCHs configured in slot n+3 and slot n+4 are transmitted on the same hop, the DMRSs configured in the PUCCHs can be used for joint channel estimation. Referring to FIG. 53(b), the UE may set the repeat transmission slot index of the first PUCCH to be repeatedly transmitted to 0, and may 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, may be set to 1. There are no slots available for PUCCH transmission consecutive to slot n+2 (slots n+3 and 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, may be set to 2. The repeat transmission slot index of slot n+6, which is the slot adjacent to slot n+5, may be the same as that of 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 the period and offset of the time window for frequency hopping. The terminal applies the period and offset to the slot in which repeated transmission of the 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 the PUCCH. Referring to Figure 54, the base station can set N to 4 or 8 in a cell in which the subcarrier spacing is 15 kHz, and can set the period to 2 ms and the offset to 0 ms regardless of the value of N. Therefore, the terminal can map and transmit two PUCCHs to one hop in both cases in which N is 4 and 8. Meanwhile, the base station can set (instruct) to the terminal different period and offset depending on the number of repeated transmissions of the PUCCH. Referring to Figure 55, the base station can set to the terminal the period to 2 ms and the offset to 0 ms if N is 4 in a cell in which the subcarrier spacing is 15 kHz, and the period to 4 ms and the offset to 0 ms if N is 8. Therefore, if N is 4, the terminal can map two PUCCHs that are repeatedly transmitted to one hop and transmit them, and if N is 8, the terminal can map four PUCCHs that are repeatedly transmitted to one hop and transmit them.

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

[0358] How to set N and M

[0359] i) The terminal can map the PUCCH repeatedly transmitted in a preset number of slots to the same frequency hop and transmit it. In this case, M can be set regardless of the number of repetitions of the PUCCH. Referring to Figure 56, if the number of repetitions (N) of the PUCCH is set to 2, M can be set to 2 regardless of the number of repetitions. That is, the terminal can map two slots of the PUCCH repeatedly transmitted to one hop and transmit it regardless of the number of repetitions.

[0360] ii) The UE can map the PUCCH repeatedly transmitted in a preset 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. Therefore, the PUCCH repeatedly transmitted can undergo flexible frequency hopping depending on the number of times the PUCCH is repeatedly transmitted. Referring to Figure 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 for a terminal to repeatedly transmit 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 PUCCHs using frequency hopping based on the number of hops. The terminal may determine how many hops to map N PUCCHs to be repeatedly transmitted and determine the 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 Figure 54, when N is 8, there may be a total of four hops: 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 to the terminal, and the terminal can perform repeated transmission of PUCCHs 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 first to (K-1)th hops in ascending order, and map ceil(N / K) PUCCHs to the Kth hop in ascending order for transmission. Referring to Figure 58, if the number of repeated transmissions of PUCCHs (N) 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, and #3, and map 2 (ceil(8 / 4)) PUCCHs to frequency hop #4 for transmission. 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 always map the PUCCHs to be repeatedly transmitted to the same number of hops and transmit them using frequency hopping, without setting the number of hops from the base station. iii-b) allows as many PUCCHs to be repeatedly transmitted as possible to be distributed to even frequency hops when both frequency hopping and joint channel estimation are applied. The terminal can always transmit N PUCCHs to be repeatedly transmitted in two hops. floor(N / 2) PUCCHs may be mapped in ascending order to the first hop, and N-floor(N / 2) PUCCHs may be mapped in ascending order to the second hop. Referring to Figure 59, when the number of PUCCH repetitions (N) is 8, the terminal can map 4 (floor(8 / 2)) PUCCHs to hop #1 and 4 (ceil(8 / 2)) PUCCHs to hop #2 for transmission. 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. In 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 configured, 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 conditions.

[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 transmitted repeatedly. The transmission block size is determined based on one slot, and the PUSCH may be repeatedly transmitted over 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 DMRSs are transmitted in different slots (slot n or slot n+1), but may be used for joint channel estimation if they satisfy the above-mentioned joint channel estimation conditions. b) On the other hand, the PUSCH may be a PUSCH including different transmission blocks. In this case, the PUSCHs may be scheduled or activated by different DCIs. Alternatively, the PUSCHs may be PUSCHs including different transmission blocks that are 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), but may be used for joint channel estimation if the above-mentioned joint channel estimation conditions are met.

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

[0370] How to determine the time domain interval

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

[0372] i) The base station explicitly transmits information about the time domain interval to the terminal, and the terminal can determine the time domain interval based on the transmitted information about the time domain interval. In this case, the information about the time domain interval may be information about the length of the time domain interval, and specifically, may include at least one of information about 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 the joint channel estimation condition in the time domain interval set by the base station. When the terminal receives information about the time domain interval from the base station, the terminal must determine the start time of the time domain interval.

[0373] ia) The start time of the time domain interval 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 by grouping five 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 start point of the time domain interval may be the first uplink symbol of the first uplink slot of radio frame index 0. An uplink slot refers to 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 five slots starting from the first uplink slot of radio frame index 0.

[0375] ic) The start point of the time domain interval may be the first non-downlink symbol of the first non-downlink slot of radio frame index 0. A non-downlink slot may be a slot including at least one non-downlink symbol. A 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 five slots starting from the first non-downlink slot of radio frame index 0.

[0376] id) The UE may be configured with an offset value for determining the start time of the time domain interval 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, X symbols, or X repetitions, the time domain interval may be configured with a length corresponding to X slots, X symbols, or X repetitions. In this case, the value of X may be smaller than the length of the time domain interval.

[0377] A base station can configure information (length information) about multiple time domain intervals to a terminal. Referring to FIG. 62, when a base station configures a terminal for TDD, it can configure two patterns. In this case, different periods can be configured for each of the two patterns. If the period of the first pattern is P1 and the period of the second pattern is P2, P1+P2 can be one of the divisors of 20. Each pattern can include DL symbols, UL symbols, and flexible symbols, and can be configured in this order: DL symbols, flexible symbols, and UL symbols. Referring to FIG. 62, the base station can configure P1 to 2 ms, P2 to 3 ms, and the subcarrier spacing to 30 kHz. In this case, the base station can configure multiple patterns constituting the time domain to the terminal. In this case, if only one time domain interval is configured for multiple patterns, the configured one time domain interval may not be compatible with multiple patterns. Therefore, the base station can configure multiple time domain intervals corresponding to multiple patterns to the terminal. Specifically, the base station may configure two time domain intervals for the terminal: one configured with a first pattern and the other configured with a second pattern. Here, the length of the first time domain interval may be configured as X1 slots, X1 symbols, and X1 repetitions, and the length of the second time domain interval may be configured as X2 slots, X2 symbols, and X2 repetitions. The terminal may configure time domain interval #0 based on X1 slots, X1 symbols, or X1 repetitions from the start of the time domain interval, and may configure time domain interval #1 based on X2 slots, X2 symbols, or X2 repetitions. That is, multiple time domain intervals of different lengths may be configured. Here, the values ​​of X1 and X2 may be values ​​configured by the base station to the terminal. The base station may not explicitly indicate which time domain interval the values ​​of X1 and X2 represent, and the terminal may infer this information. That is, X1 may correspond to period P1, and X2 may correspond to 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 repeated transmissions 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 configured. 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 configured and a resource region in which a second PUSCH / PUCCH to be repeatedly transmitted is configured. 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 configured 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 repeated uplink channels are configured. In other words, a time domain interval may be determined based on a certain interval existing between resource regions in which repeated uplink channels are configured.

[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 multiple sub-time domain intervals. In this case, the DMRS included in the PUSCH or PUCCH transmitted on the sub-time domain interval can be used for joint channel estimation.

[0385] Method for determining sub-time domain intervals

[0386] i) One time domain interval may be divided based on the lengths of the sub-time domain intervals. The base station may transmit length information for the sub-time domain intervals to the terminal, and the terminal may divide the time domain interval into multiple 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 collectively determine the first slot / symbol / repetition through the Mth slot / symbol / repetition as the first sub-time domain interval. Then, the terminal may collectively determine the M+1th slot / symbol / repetition through the 2Mth slot / symbol / repetition as the second sub-time domain interval. In this case, the number of slots / symbols / repetitions included in the last sub-time domain interval may be smaller than M. Similarly, the terminal may collectively determine the k*M+1th slot / symbol / repetition through the remaining (Nth) slot / symbol / repetition 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 divides 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 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 UE determines the 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 allows 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 the 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 that includes slot n+1.

[0389] In an NR system, various subcarrier spacings may be configured, 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 referenced to determine 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 order to determine the time domain interval.

[0392] ii) When a base station configures one or more UL BWPs for a cell in a terminal, it can configure subcarrier spacings for one or more UL BWPs. When determining 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 can 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, or may be the lowest subcarrier spacing. For example, in FR1, subcarrier spacings of 15 kHz, 30 kHz, and 60 kHz are available, so the reference subcarrier spacing may be 15 kHz. In FR2, subcarrier spacings of 60 kHz and 120 kHz are available, so the reference subcarrier spacing may be 60 kHz.

[0395] v) The base station can set the 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] Hereinafter, a method will be described in which a terminal independently determines a time domain interval and transmits information about the determined time domain interval to a base station.

[0397] Method for determining a terminal's own time domain interval

[0398] i) The terminal may transmit information regarding the start or end of a time domain interval to the base station. For example, the terminal may notify the base station of information regarding the start or end of a time domain interval using a 1-bit value. For example, the terminal may indicate the start point or end point of a time domain interval as '0', and indicate intervals other than the start point as '1'. Specifically, if the resource region in which the PUCCH or PUSCH in the time domain interval is transmitted is slot n to slot n+3, the PUCCH or PUSCH transmitted in slot n may indicate '0' using a 1-bit value, and the PUCCH or PUSCH transmitted in slot n+1, slot n+2, and slot n+3 may indicate '1' using a 1-bit value. In this case, the indicated values ​​'0' and '1' may indicate opposite targets. The 1-bit value may be multiplexed into the PUSCH, and may be multiplexed into the PUSCH in the same manner as 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 about 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 slots 0 to 3 are one time domain interval and slots 4 to 5 are another time domain interval. In this case, if the base station fails to receive the PUCCH or PUSCH in slots 3 and 4, the base station can determine slots 0 to 5 as one time domain interval and perform joint channel estimation. Referring to FIG. 63(b), the terminal can transmit information about 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 slots 0 to 2 are one time domain interval, slots 3 and 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 perform channel estimation, and therefore, 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 for time domain intervals.

[0403] i) The terminal may transmit a counter indicator to the base station as information regarding a time domain interval. That is, the terminal may transmit information regarding the ordinal number of a symbol set within one time domain interval to the base station. 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 DMRSs transmitted in slots 0 to 3 and that joint channel estimation is possible using uplink DMRSs transmitted in slots 4 and 5. In this case, the counter indicator may be used to indicate the start slot in which joint channel estimation is possible as 0, and subsequent slots may be indicated by counter values ​​of 1, 2, ..., 3 in ascending order. Referring to FIG. 64(b), the uplink DMRSs transmitted in slots 0 to 2 are capable of joint channel estimation, and the uplink DMRSs transmitted in slots 3 and 4 are capable of joint channel estimation. In this case, the terminal may use the counter indicator to indicate the start slot in which joint channel estimation is possible as 0, and 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 of slots 3 and 4, it can be seen from the counter indicator that joint channel estimation is not possible for the uplink transmissions of slots 2 and 5. This is because the counter indicator values ​​of slots 2 and 5 do not satisfy the ascending order.

[0404] ia) The terminal may transmit information regarding 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 transmissions. Referring to Figure 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 is present 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 the ambiguity regarding the time domain interval by notifying the base station of the total indicator in addition to the counter indicator. In Figure 65(b), (a, b) for each slot 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 values ​​of the overall indicators for slot 0 and slot 1 are the same.

[0405] ii) The UE can transmit information about the indexes of time domain intervals to the base station. By setting one time domain interval to the same index and setting other time domain intervals to sequentially incremented indexes, the UE can inform the base station that they are different time domain intervals. Referring to FIG. 66, the UE can inform the base station that it is an uplink channel transmission in the same time domain interval using the same index and can inform the base station that it is an uplink channel transmission in another time domain interval using an incremented index. This has the effect that, when the base station fails to receive the uplink channels transmitted in slots 3 and 4 described in FIG. 66(b), the base station can recognize this and request the UE to retransmit the uplink channels. That is, since the indexes of slots 0 to 2 and the index of slot 5 are different from each other, the base station can recognize that slots 0 to 2 and slot 5 are included in different time domain intervals.

[0406] Hereinafter, a method for determining a time domain interval when multiple uplink cells are configured for 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 base station may configure multiple uplink cells for a terminal. The configuration of multiple 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 uplink channels through the configured PCell or SCell. The uplink physical channel may be at least one of a PUSCH or a PUCCH. The terminal may share transmission power when transmitting uplink channels from multiple cells configured in the same frequency band. When multiple uplink cells are configured for a terminal, they may be configured to satisfy the above-mentioned joint channel estimation condition. If a single time domain interval is configured for the terminal when uplink carrier aggregation is configured, it may be difficult to determine the time domain interval to be applied to multiple cells. In this case, the configured time domain interval may be configured based on the PCell. When different TDD configurations are configured for each cell, the time domain interval configured with reference to the PCell may be an interval that is incompatible with joint channel estimation for uplink channels transmitted on the SCell. Referring to Figure 67, two uplink cells, cell #0 and cell #1, are configured in a terminal, and different TDD configurations may be configured for each cell. The time domain interval is configured with reference to cell #0, and may be configured every five slots starting from the first slot in a frame. Although cell #1 has six consecutive uplink slots, the time domain interval is configured every five slots, so the time domain interval configured with reference to cell #0 may not be compatible with cell #1.

[0409] A base station may configure 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 based on the PCell may not be set accurately. Referring to Figure 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 based on cell #0 and may be set every five slots or every 2.5 ms starting from the first slot in the radio frame. In this case, the same time domain interval may also 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.

[0411] 69 to 74 show a method for 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 interval for each of multiple cells. That is, when N uplink cells including the PCell are configured in a terminal, the base station can configure a time domain interval to be applied to each of the N cells. Referring to Figure 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 cell #0 and cell #1, respectively. Time domain window #0 may consist of two slots of 1 ms, and time domain window #1 may consist of two slots of 2 ms. In this case, to reduce signaling overhead, the base station can use specific parameters commonly applied to each cell when configuring the time domain interval for each cell.

[0413] ia) A reference subcarrier spacing may be used commonly for each cell. That is, the base station may configure only a reference subcarrier spacing for one time domain interval to the terminal. Alternatively, 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 determine the subcarrier spacing for the time domain window of each cell. For example, the terminal may select any one subcarrier spacing from the determined subcarrier spacings for each cell and apply the selected one subcarrier spacing to the time domain intervals of all cells. In this case, the one subcarrier spacing may be the lowest subcarrier spacing among the subcarrier spacings of each cell. As another example, the terminal may apply the subcarrier spacing for the time domain interval of Pcell among each cell to the time domain intervals of all cells. As yet another example, the terminal may apply the subcarrier spacing for the time domain window of the cell with the 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 larger than the subcarrier spacing configured in the UL BWP of all cells.

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

[0415] ii-a) The UE can select one reference cell from multiple uplink cells, and can apply a time domain duration determined based on the selected reference cell to all cells. The method for 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 the cell with the lowest cell index. The lowest cell index may be 0. That is, the PCell may be the reference cell. On the other hand, the lowest cell index may be 1 or greater. 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. This is to prevent the boundary of the time domain section from being included in the slot of a different cell, as described with reference to FIG. 68. In this case, if there are multiple cells configured with the lowest subcarrier spacing, the reference cell may be selected taking other criteria into consideration. The other criteria may be the cell index, the TDD configuration period, or the ratio of uplink slots. For example, if there are two cells configured with the lowest subcarrier spacing, the cell with the lowest cell index of both may be the reference cell.

[0419] - The longest TDD configuration periodicity: The reference cell may be the cell with the longest TDD configuration period. The TDD configuration period refers to the period during which one TDD configuration is repeated according to the 3GPP standard. Referring to Figure 72, the subcarrier spacing of all cells may be 15 kHz, and the TDD configuration period of cell #0 may be 5 ms, and the TDD configuration period of cell #1 may be 10 ms. The UE may determine the cell with the longest TDD configuration period as the reference cell to include the maximum number of uplink slots for multiple uplink cells, and apply the time domain duration of the reference cell to all cells. Therefore, since the TDD configuration period of cell #0 is 5 slots and the TDD configuration period of cell #1 is 10 slots, cell #1 may be selected as the reference cell, and the time domain duration of cell #1 may be applied to all cells. If there are multiple cells with the longest TDD configuration period, the reference cell may be selected taking other criteria into consideration. Other criteria may be the cell index, subcarrier spacing, or uplink slot ratio. If there are two cells with the longest TDD configuration periods, the cell with the lower SCS of both may be selected as the reference cell.

[0420] - The most UL slot portion: The reference cell may be the cell including the most uplink slots. That is, the UE may determine, among multiple uplink cells, a cell including the most uplink slots in the same time interval as the reference cell and perform uplink transmission for joint channel estimation. The same time interval may be the longest TDD configuration period among the multiple cells. Referring to Figure 73, cell #1, which includes more uplink slots than cell #0, may be the reference cell. If there are multiple cells including the most uplink slots, the reference cell may be selected taking other criteria into consideration. Other criteria may be a cell index, a subcarrier spacing, or a TDD configuration period. If there are two cells including the most uplink slots, the cell with the longest TDD configuration period of both may be selected as the reference cell.

[0421] iii) The UE may determine a time domain interval based on consecutive slots of a union of uplink slots for multiple uplink cells. The UE may determine a time domain interval based on consecutive slots of a union of uplink slots b...

Claims

1. A terminal configured to operate in wireless communication of a wireless communication system, the terminal comprising: A transmitter / receiver, a processor configured to control the transceiver; the processor: receiving slot configuration information for an uplink channel; The uplink channel is configured to repeatedly transmit the uplink channel including a Demodulation Reference Signal (DM-RS) on resources determined based on the slot configuration information using frequency hopping on a first hop and a second hop; the uplink channel is repeatedly transmitted during a first interval in the first hop, and the uplink channel is repeatedly transmitted during a second interval in the second hop; The first hop and the second hop are transmitted on different physical resource blocks (PRBs) by frequency hopping; the first spacing includes first consecutive slots, and the second spacing includes second consecutive slots; 20. The terminal of claim 19, wherein power consistency and phase continuity are maintained across uplink channel repetitions within each of the first interval and the second interval.

2. The terminal described in claim 1, characterized in that the number of first consecutive slots and the number of second consecutive slots are received from a base station.

3. Each slot of the first consecutive slots has the same identification number; 2. The terminal of claim 1, wherein each slot of said second series of consecutive slots has the same identification number.

4. The uplink channels for the first hop are transmitted on resources of the same number of Physical Resource Blocks (PRBs) starting from PRB positions in the same frequency domain; The terminal of claim 1 , wherein the uplink channels for the second hop are transmitted on resources of the same number of PRBs starting from PRB positions in the same frequency region.

5. The terminal according to claim 1, wherein the uplink channel is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

6. A method performed by a terminal in a wireless communication system, the method comprising: receiving slot configuration information for an uplink channel; repeatedly transmitting the uplink channel including a Demodulation Reference Signal (DM-RS) on resources determined based on the slot configuration information using frequency hopping on a first hop and a second hop; the uplink channel is repeatedly transmitted during a first interval in the first hop, and the uplink channel is repeatedly transmitted during a second interval in the second hop; The first hop and the second hop are transmitted on different physical resource blocks (PRBs) by frequency hopping; the first spacing includes first consecutive slots, and the second spacing includes second consecutive slots; 20. The method of claim 19, wherein power consistency and phase continuity are maintained across uplink channel repetitions within each of the first interval and the second interval.

7. The method of claim 6, wherein the number of first consecutive slots and the number of second consecutive slots are received from a base station.

8. The method of claim 7, wherein each slot of the first series of consecutive slots has the same identification number; 7. The method of claim 6, wherein each slot of said second series of consecutive slots has the same identification number.

9. The uplink channels for the first hop are transmitted on resources of the same number of Physical Resource Blocks (PRBs) starting from PRB positions in the same frequency domain; The method of claim 6, wherein the uplink channels for the second hop are transmitted on resources of the same number of PRBs starting from PRB positions in the same frequency region as each other.

10. The method of claim 6, wherein the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

11. A base station configured to operate in wireless communication of a wireless communication system, the base station comprising: A transmitter / receiver, a processor configured to control the transceiver; the processor: Transmitting slot configuration information for an uplink channel; The uplink channel is configured to repeatedly receive the uplink channel including a Demodulation Reference Signal (DM-RS) on resources determined based on the slot configuration information using frequency hopping on a first hop and a second hop; the uplink channel is repeatedly received during a first interval in the first hop, and the uplink channel is repeatedly received during a second interval in the second hop; The first hop and the second hop are received on different physical resource blocks (PRBs) by frequency hopping; the first spacing includes first consecutive slots, and the second spacing includes second consecutive slots; A base station, characterized in that power consistency and phase continuity are maintained across uplink channel repetitions within each of said first interval and said second interval.

12. The base station of claim 11, wherein the number of the first consecutive slots and the number of the second consecutive slots are transmitted to a terminal.

13. The method of claim 12, wherein each slot of the first series of consecutive slots has the same identification number; 12. The base station of claim 11, wherein each slot of the second consecutive slots has the same identification number.

14. The uplink channels for the first hop are received on resources of the same number of physical resource blocks (PRBs) starting from PRB positions in the same frequency domain; The base station of claim 11, wherein the uplink channels for the second hop are received on resources of the same number of PRBs starting from PRB positions in the same frequency region.

15. The base station according to claim 11, wherein the uplink channel is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

16. A method performed by a base station in a wireless communications system, the method comprising: transmitting slot configuration information for an uplink channel; repeatedly receiving the uplink channel including a Demodulation Reference Signal (DM-RS) on resources determined based on the slot configuration information using frequency hopping on a first hop and a second hop; the uplink channel is repeatedly received during a first interval in the first hop, and the uplink channel is repeatedly received during a second interval in the second hop; The first hop and the second hop are received on different physical resource blocks (PRBs) by frequency hopping; the first spacing includes first consecutive slots, and the second spacing includes second consecutive slots; 20. The method of claim 19, wherein power consistency and phase continuity are maintained across uplink channel repetitions within each of the first interval and the second interval.

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