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

Abstract

The object of the present invention is to provide a method for transmitting an uplink channel in a wireless communication system and an apparatus therefor. [Solution] A method for transmitting an uplink channel in a wireless communication system, the method performed by a terminal, includes the steps of: receiving first information from a base station, which is information related to a TDD (Time Division Duplex) configuration; and repeatedly transmitting an uplink channel to the base station on a resource determined based on the first information.

Description

[Technical Field]

[0001] This specification relates to wireless communication systems, and more particularly to a method and apparatus for transmitting an uplink channel. [Background technology]

[0002] Following the commercialization of fourth-generation (4G) communication systems, efforts are underway to develop a new fifth-generation (5G) communication system to meet the growing demand for wireless data traffic. 5G communication systems are also referred to as post-LTE systems or new radio (NR) systems, or the next generation of network communication systems beyond 4G. To achieve high data transfer rates, 5G communication systems include systems operating using millimeter-wave (mmWave) bands above 6 GHz, as well as systems operating using frequency bands below 6 GHz to ensure coverage. Consequently, implementation forms at base stations and terminals are still under consideration.

[0003] This increases efficiency and enables communication providers to deliver more data and voice services over a given bandwidth. Therefore, 3GPP® NR systems are designed to meet the demand for high-speed data and media transmission, in addition to supporting large volumes of voice. The advantages of NR systems include higher throughput and lower latency, support for frequency division duplexing (FDD) and time division duplexing (TDD) on the same platform, and lower operating costs with an enhanced end-user environment and a simpler architecture. For more efficient data processing, dynamic TDD in NR systems can use methods to vary the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in uplink and downlink, according to the data traffic direction of the cell user. For example, when a cell's downlink traffic is greater than its uplink traffic, the base station may allocate more downlink OFDM symbols to slots (or subframes). Information about the slot configuration should be transmitted to the terminal.

[0004] To mitigate path loss in the ultra-high frequency band and increase the transmission distance of radio waves, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming (combining analog and digital beamforming), and large-scale antenna technologies are being discussed for 5G communication systems. Furthermore, in order to improve the system network, 5G communication systems are undergoing technological development related to 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, CoMP (coordinated multi-points), and interference cancellation.In addition, 5G systems have seen the development of advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), as well as advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access).

[0005] On the other hand, in a human-centered connected network where humans generate and consume information, the internet is evolving into the Internet of Things (IoT) network, where information is exchanged between distributed components such as objects. Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connectivity 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 explored for object-to-object connectivity. In an IoT environment, intelligent internet technology (IT) services can be provided that collect and analyze data generated from connected objects to create new value in human life. Through the integration and blending of existing information technology (IT) with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0006] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (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 convergence of 5G technology and IoT technology. In general, mobile communication systems are developed to provide voice services while ensuring user activity.

[0007] However, mobile communication systems are gradually expanding beyond voice to include data services, and have now developed to the point where high-speed data services are available. However, due to resource shortages in currently available mobile communication systems and the demand for high-speed services from users, more advanced mobile communication systems are needed. [Overview of the project] [Problems that the invention aims to solve]

[0008] This specification aims to provide a method and apparatus for transmitting an uplink channel in a wireless communication system. [Means for solving the problem]

[0009] This 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, performed by a terminal, involves transmitting from a base station to a TDD (Time Division Deposition). A step of receiving first information which is information relating to a duplex configuration, wherein the first information includes information about the 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; a step of repeatedly transmitting an uplink channel to the base station on a resource determined based on the first information, wherein the uplink channel is repeatedly transmitted on a first hop and a second hop, each of which is composed of a bundle of a set number of slots used for transmitting uplink channels, each of which is composed of the uplink symbols, each of which is composed of time-domain consecutive slots, and each of which is transmitted on different PRBs (Physical Resource Blocks) by frequency hopping;

[0011] Furthermore, this specification further includes the step of receiving information about the time domain interval from the base station, wherein the time domain interval is configured based on the information about the time domain interval.

[0012] A terminal in a wireless communication system that transmits an uplink channel, the terminal includes a transceiver; and a processor that controls the transceiver, the processor receiving data from a base station, TDD (Time Division Deposition). The system receives first information relating to a Duplex configuration, the first information includes information about the 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 either a downlink symbol or an uplink symbol, and repeatedly transmits an uplink channel to the base station on a resource determined based on the first information, the uplink channel being repeatedly transmitted on a first hop and a second hop, the first hop and the second hop each consisting of a bundle of a set number of slots used for transmitting uplink channels, the slots used for transmitting uplink channels each including the uplink symbol, the first hop and the second hop each consisting of time-domain consecutive slots, and the first hop and the second hop each being transmitted on different Physical Resource Blocks (PRBs) by frequency hopping.

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

[0014] Furthermore, in this specification, the previously set number is characterized in that it is received from the base station.

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

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

[0017] Furthermore, in this specification, the slot used for transmission of the uplink channel is characterized in that it includes the uplink symbol and the flexible symbol.

[0018] Furthermore, in this specification, the first hop is comprised of a first slot and a second slot, the first slot including a first DM-RS (Demodulation Reference Signal), the second slot including a second DM-RS, the first DM-RS and the second DM-RS being transmitted over resources with the same number of PRBs starting from the same PRB location in the same frequency domain, and being transmitted with the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming; the second hop is comprised of a third slot and a fourth slot, the third slot including a third DM-RS, the fourth slot including a fourth DM-RS, the third DM-RS and the fourth DM-RS being transmitted over resources with the same number of PRBs starting from the same PRB location in the same frequency domain, and being transmitted with the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming.

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

[0020] Furthermore, in this specification, the uplink channel is characterized by being either a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

[0021] Furthermore, in this specification, the uplink channel is characterized by being transmitted within a time-domain interval.

[0022] Furthermore, in this specification, the information relating to the time-domain interval is characterized by including one of the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel.

[0023] Furthermore, in this specification, the time domain interval is characterized in that it is from the time when repeated transmission of the uplink channel begins to the time when repeated transmission of the uplink channel ends.

[0024] Furthermore, in this specification, the time domain interval is characterized by being composed of consecutive slots in a time domain that includes at least one of the uplink symbol and the flexible symbol.

[0025] Furthermore, in this specification, the time domain interval includes a first time domain interval and a second time domain interval, the first time domain interval is configured in accordance with a first pattern, the second time domain interval is configured in accordance with a second pattern, the first pattern and the second pattern are composed of a plurality of slots, and the configurations of the plurality of slots that constitute the first pattern and the second pattern, respectively, are different from each other.

[0026] Furthermore, in this specification, the DM-RS included in each of the multiple slots constituting the first pattern are transmitted over resources with the same number of PRBs starting from the same PRB position in the same frequency domain, and are transmitted using the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming. The DM-RS included in each of the multiple slots constituting the second pattern are transmitted over resources with the same number of PRBs starting from the same PRB position in the same frequency domain, and are transmitted using the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming.

[0027] A method for receiving an uplink channel in a wireless communication system, performed by a base station, comprising the steps of: transmitting to a terminal first information which is information relating to a TDD (Time Division Duplex) configuration, wherein the first information includes information relating to the type of symbols constituting a slot, the type of symbol being one of a downlink symbol configured for downlink transmission, an uplink symbol configured for uplink transmission, and a flexible symbol not configured as either a downlink symbol or an uplink symbol; and receiving from the terminal an uplink channel that is repeatedly transmitted over a resource determined based on the first information, wherein the uplink channel is repeatedly transmitted over a first hop and a second hop, each comprising a bundle of a set number of slots used for transmitting uplink channels, each comprising a slot used for transmitting uplink channels which includes the uplink symbol, each comprising a time-domain consecutive slot, and each comprising different PRBs (Physical Resources) through frequency hopping. Characterized by including a stage that is transmitted on a Block. [Effects of the Invention]

[0028] This specification aims to transmit an uplink channel using frequency hopping.

[0029] This specification aims to provide a method for transmitting DMRS, which are coupled together and used for channel estimation, over an uplink channel.

[0030] This specification aims to provide a method for determining the time-domain intervals to which DMRS signals are transmitted, which are coupled together and used for channel estimation.

[0031] The effects derived from this specification are not limited to those mentioned above, and other effects not mentioned above will be clearly understood by a person with ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawing]

[0032] [Figure 1] This figure shows an example of a wireless frame structure used in a wireless communication system. [Figure 2] This figure shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] This diagram illustrates the physical channels used in 3GPP systems and typical signal transmission methods that utilize these physical channels. [Figure 4a] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4b] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5a] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 5b] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 6] This diagram shows the control resource set (CORESET) that can be transmitted within a physical downlink control channel (PDCCH) in a 3GPP NR system. [Figure 7] This figure shows a method for constructing the PDCCH search space in the 3GPP NR system. [Figure 8] This is a conceptual diagram illustrating carrier aggregation. [Figure 9]This diagram illustrates single-carrier and multi-carrier communication. [Figure 10] This figure shows an example of how cross-carrier scheduling techniques are applied. [Figure 11] This is a block diagram showing the configuration of a terminal and a base station according to one embodiment of the present invention. [Figure 12] This invention describes a method for scheduling a physical uplink sharing channel in the time domain according to one embodiment of the present invention. [Figure 13] This invention describes a method for scheduling a physical uplink sharing channel in the frequency domain according to one embodiment of the present invention. [Figure 14] This shows repeated transmission of a physical uplink sharing channel according to one embodiment of the present invention. [Figure 15] This document describes a scheduling method for a physical uplink control channel according to one embodiment of the present invention. [Figure 16] This shows a repetitive transmission of a physical uplink control channel according to one embodiment of the present invention. [Figure 17] This describes a problem that occurs when a terminal repeatedly transmits PUSCH in a TDD situation according to one embodiment of the present invention. [Figure 18] This describes a problem that occurs when a terminal repeatedly transmits a PUCCH signal in a TDD situation according to one embodiment of the present invention. [Figure 19] This describes a method for combining repeatedly transmitted PUSCH signals according to one embodiment of the present invention. [Figure 20] This describes a method for combining repeatedly transmitted PUSCH signals according to one embodiment of the present invention. [Figure 21] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 22] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 23] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 24] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 25] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 26] This describes a frequency hopping method for repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 27] This invention provides a method for determining the position of a symbol to which a DMRS included in a repeatedly transmitted PUSCH is mapped, according to one embodiment of the present invention. [Figure 28] This document describes a method for repeatedly transmitting PUCCH according to one embodiment of the present invention. [Figure 29] This document describes a method for repeatedly transmitting PUCCH according to one embodiment of the present invention. [Figure 30] This document describes a method for repeatedly transmitting PUCCH according to one embodiment of the present invention. [Figure 31] This document describes a method for repeatedly transmitting PUSCH according to one embodiment of the present invention. [Figure 32] This document describes a method for repeatedly transmitting PUSCH according to one embodiment of the present invention. [Figure 33] This invention describes a method for setting the resources to which a PUCCH is sent according to one embodiment of the present invention. [Figure 34] This demonstrates that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on the same symbol. [Figure 35] This demonstrates that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on a different symbol from the others. [Figure 36] This demonstrates that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on a different symbol from the others. [Figure 37] This demonstrates that each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention is transmitted on a different symbol from the others. [Figure 38] This shows a case in which the same number of PRBs are set for each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention. [Figure 39] This shows a PRB for transmitting DMRS, which is set for each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention. [Figure 40] This shows a PRB for transmitting DMRS, which is set for each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention. [Figure 41] This shows a repeatedly transmitted PUSCH according to one embodiment of the present invention. [Figure 42] This invention presents an embodiment of a method for multiplexing a repeatedly transmitted PUSCH and a UCI included in the repeatedly transmitted PUSCH. [Figure 43] This invention presents an embodiment of a method for multiplexing a repeatedly transmitted PUSCH and a UCI included in the repeatedly transmitted PUSCH. [Figure 44] This example shows the cancellation of a repeatedly transmitted PUSCH based on a repeatedly transmitted PUCCH according to one embodiment of the present invention. [Figure 45] This shows a repeatedly transmitted PUCCH according to one embodiment of the present invention. [Figure 46] This shows a repeatedly transmitted PUCCH and intra-slot frequency hopping according to one embodiment of the present invention. [Figure 47] This shows a repeatedly transmitted PUCCH and inter-slot frequency hopping according to one embodiment of the present invention. [Figure 48] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 49] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 50] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 51] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 52] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 53] This invention provides a method for determining the repetitive transmission slot index when transmitting PUCCH using frequency hopping, according to one embodiment of the present invention. [Figure 54] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 55] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 56] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 57] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 58] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 59] This invention describes a method for mapping PUCCH repetitions to frequency hops according to one embodiment of the present invention. [Figure 60] This shows the scheduling of a physical uplink sharing channel according to one embodiment of the present invention. [Figure 61] This shows the scheduling of multiple physical uplink sharing channels according to one embodiment of the present invention. [Figure 62] This invention describes a method for determining a time domain window according to one embodiment of the present invention. [Figure 63] This document describes a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 64] This document describes a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 65] This document describes a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 66] This document describes a method for indicating a time domain interval according to one embodiment of the present invention. [Figure 67] This invention provides a method for determining a time-domain window based on the carrier integration status according to one embodiment of the present invention. [Figure 68]This invention provides a method for determining a time-domain window based on the carrier integration status according to one embodiment of the present invention. [Figure 69] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 70] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 71] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 72] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 73] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 74] This document describes a method for setting a time domain interval according to one embodiment of the present invention. [Figure 75] This flowchart shows a method for transmitting an uplink channel according to an embodiment of the present invention. [Modes for carrying out the invention]

[0033] The terminology used herein adopts common terms that are currently widely used as possible by considering the function of the present invention, but these terms may be modified in accordance with the intent, practice, and emergence of new technologies of those skilled in the art. Furthermore, in certain cases, there are terms that are at the discretion of the applicant, in which case their meanings will be explained in the corresponding descriptive sections of the present invention. It is therefore intended to be clear that the terminology used herein should be analyzed not only on the basis of the names of the terms but also on the substantive meaning of the terms and content throughout this specification.

[0034] Throughout this specification and the following claims, when an element is described as being “connected” to another element, that element may be “directly connected” to the other element, or “electrically connected” to the other element through a third element. Furthermore, unless explicitly stated otherwise, the word “equips” shall be understood as implying the inclusion of the element being described, and not as implying the exclusion of any other element, unless otherwise specified. Moreover, limitations such as “greater than” or “less than” based on a particular threshold may be appropriately replaced in some exemplary embodiments with “greater than” or “less than,” respectively.

[0035] The following technologies can be used in various wireless access systems, including 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 can be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by wireless technologies such as Global System for Mobile Communications (GSM®) / General-Purpose Packet Radio Service (GPRS) / GSM® Advanced High-Speed ​​Data Rate (EDGE). OFDMA can be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Advanced UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The Third Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is part of Advanced UMTS (EUMTS), which uses Advanced UMTS Terrestrial Radio Access (E-UTRA), and LTE Advanced (A) is an advanced version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A to support the requirements of IMT-2020: enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) services. For clarity, 3GPP NR will be described primarily, but the technical ideas of this invention are not limited to them.

[0036] Unless otherwise specified in this specification, the base station may refer to a next-generation node B (gNB) as defined in 3GPP NR. Further, unless otherwise specified, the terminal may refer to a user equipment (UE). Hereinafter, for the sake of understanding the description, each content will be separately described as an example, but each example may be used in combination with each other. In the present disclosure, the configuration of the terminal can represent the configuration by the base station. Specifically, the base station can transmit a channel or a signal to the terminal and set the value of the operation of the terminal or the parameters used in the wireless communication system.

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

[0038] Referring to FIG. 1, the wireless frame (or radio frame) used in the 3GPP NR system may have a length of 10 ms (Δf f,ref , c , ref , f , f,ref , μ , ref , 3 N f / 100)*T c ). In addition, the wireless frame includes 10 subframes (SF: subframe) of equal size. In this specification, Δf max = 480 * 10 3 [[ID=]18]Hz, N f = 4096, T c = 1 / (Δf ref * N f,ref ), Δf ref = 15 * 10 3 Hz, and N f,ref = 2048. Numbers from 0 to 9 may be respectively assigned to the 10 subframes within one wireless frame. Each subframe has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15 * 2 μThe frequency is kHz, and μ can have values ​​of μ = 0, 1, 2, 3, 4 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe with a length of 1 ms is 2 μ It may contain 2 slots. In this case, the length of each slot is 2 -μ It is ms. 2 within one subframe μ Each slot has 0 to 2 μ Numbers up to -1 may be assigned. In addition, each slot within a single wireless frame can be assigned from 0 to 10*2. μ A number up to -1 may be assigned. Time resources can be distinguished by at least one of the following: wireless frame number (also called wireless frame index), subframe number (also called subframe index), and slot number (or slot index).

[0039] Figure 2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the resource grid structure of a 3GPP NR system.

[0040] Specifically, Figure 2 shows the structure of the resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot contains multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol section. Unless otherwise specified, an OFDM symbol is sometimes simply called a symbol. One RB contains 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, the signal transmitted from each slot is N size,μ grid,x *N RB sc Book subcarriers and N slot symbIt may be represented by a resource grid containing n OFDM symbols, where x=DL when the signal is a DL signal and x=UL when the signal is a UL signal. size,μ grid,x This represents the number of resource blocks (RBs) according to the subcarrier interval, which is a component of μ (where x is DL or UL), and N slot symb This represents the number of OFDM symbols in the slot. RB sc N is the number of subcarriers that make up one RB. RB sc = 12. OFDM symbols are sometimes called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols, depending on the multiple access scheme.

[0041] The number of OFDM symbols contained in a single slot may vary depending on the length of the cyclic prefix (CP). For example, with a normal CP, a single slot may contain 14 OFDM symbols, while with an extended CP, a single slot may contain 12 OFDM symbols. In certain embodiments, the extended CP may be used only at a 60 kHz subcarrier interval. In Figure 2, for illustrative purposes, a single slot is configured using 14 OFDM symbols as an example, but embodiments of this disclosure may similarly apply to slots with different numbers of OFDM symbols. Referring to Figure 2, each OFDM symbol has N in the frequency domain. size,μ grid,x *N RB sc This includes subcarriers. Subcarrier types can be divided into data subcarriers for data transmission, reference signal subcarriers for reference signal transmission, and guard bands. The carrier frequency is also called the center frequency (fc).

[0042] One RB is N in the frequency domain. RB sc (For example, 12) can be defined by consecutive subcarriers. For reference, a resource composed of one OFDM symbol and one subcarrier is sometimes called a resource element (RE) or tone. Thus, one RB is N slot symb *N RB sc It can be composed of individual resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k,l) within a single slot, where k ranges from 0 to N in the frequency domain. size,μ grid,x *N RB sc The index can be assigned up to -1, and l is from 0 to N in the time domain. slot symb It can be an index that can be allocated down to -1.

[0043] For a UE to receive signals from or transmit signals to a base station, the UE's time / frequency may be synchronized with the base station's time / frequency. This is because, when the base station and UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate the DL signal and transmit the UL signal at the appropriate time.

[0044] Each symbol in a radio frame used in time-division duplexing (TDD), i.e., in an unpaired spectrum, may consist of at least one of DL symbols, UL symbols, and flexible symbols. A radio frame used as a DL carrier in frequency-division duplexing (FDD), i.e., in a paired spectrum, may consist of DL symbols or flexible symbols, and a radio frame used as a UL carrier may consist of UL symbols or flexible symbols. DL symbols allow for DL ​​transmission but not UL transmission. UL symbols allow for UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL depending on the signal.

[0045] Information about each symbol type, i.e., information representing one of DL symbols, UL symbols, and flexible symbols, may be provided using cell-specific or common radio resource control (RRC) signals. In addition, information about each symbol type may be provided using UE-specific or dedicated RRC signals. The base station notifies the following using cell-specific RRC signals: 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 a 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 a slot with only UL symbols. Here, a flexible symbol is a symbol that is not configured using either a UL symbol or a DL 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 slot symb symbols of the corresponding slot for each slot, and the number of UL symbols among the N slot symb symbols of the corresponding slot. In this case, the DL symbols of the slot can be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot can be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, the symbol that is not configured using either UL symbols or DL symbols is the flexible symbol.

[0047] The type of symbol composed of the RRC signal as described above is referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration composed 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 uplink symbol composed of the RRC signal is not changed to another symbol type. Table 1 illustrates the dynamic SFI indicated by the base station to the terminal.

[0048]

Table 1

[0049] In Table 1, D represents the downlink symbol, U represents the uplink symbol, and X represents the flexible symbol. As shown in Table 1, a maximum of two DL / UL switching operations are permitted in a single slot.

[0050] Figure 3 illustrates the physical channels used in 3GPP systems (e.g., NR) and a typical signal transmission method utilizing these physical channels.

[0051] When the UE is powered on or camp-on to a new cell, the UE performs an initial cell discovery (S101). Specifically, the UE may synchronize with the base station during the initial cell discovery. To this end, the UE may receive primary synchronization signals (PSS) and secondary synchronization signals (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Subsequently, the UE may receive physical broadcast channels from the base station and obtain broadcast information in the cell.

[0052] Upon completion of the initial cell discovery, the UE receives the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) according to the information in the PDCCH. As a result, the UE can obtain more specific system information than the system information obtained through the initial cell discovery (S102). Here, the system information obtained by the UE is the cell-common system information necessary for the UE to operate correctly at the physical layer in the Radio Resource Control (RRC), and is also called 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 to the base station (operations S103-S106). First, the UE can transmit a preamble through a physical random access channel (PRACH) (S103), and can receive a response message for the preamble from the base station through the PDCCH and the corresponding PDSCH (S104). Once the UE receives a valid random access response message, the UE transmits data, including the UE's identifier, to the base station through a physical uplink shared channel (PUSCH), indicated by a UL authorization transmitted from the base station via the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH with the UE's identifier (S106), the random access process is terminated. During the random access process, the UE can obtain UE-specific system information at the RRC layer that is necessary for the UE to operate correctly at the physical layer. When the UE obtains UE-specific system information at the RRC layer, the UE enters RRC_CONNECTED mode.

[0054] The RRC layer is used for message generation and management for control between terminals and the Radio Access Network (RAN). More specifically, base stations and terminals can use the RRC layer to broadcast cell system information necessary for all terminals in a cell, manage the transmission of paging messages, manage mobility and handover, report and control terminal measurements, and manage storage including terminal capability management and equipment management. In general, the update of signals transmitted in the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission time interval (TTI) in the physical layer, so RRC signals can be maintained unchanged over long periods.

[0055] After the procedure described above, the UE receives the PDCCH / PDSCH (S107) and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. The format of the DCI may also vary depending on the intended use. The uplink control information (UCI) that the UE transmits to the base station through the UL includes DL / UL ACK / NACK signals, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI may be included in the channel state information (CSI). In a 3GPP NR system, the UE may transmit control information such as the HARQ-ACK and CSI described above via PUSCH and / or PUCCH.

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

[0057] When powered on or when a new cell is desired, the UE can obtain time and frequency synchronization with the cell and perform the initial cell discovery procedure. During the cell discovery procedure, the UE can discover the cell's physical cell identification information, NcellID. To this end, the UE can receive synchronization signals from the base station, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and synchronize with the base station. In this case, the UE can obtain information such as the cell identification information (ID).

[0058] The synchronization signal (SS) is described in more detail with reference to Figure 4a. Synchronization signals can be classified into PSS and SSS. PSS can be used to obtain time-domain and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. Referring to Figure 4a and Table 2, an SS / PBCH block can be constructed using 20 consecutive RBs (=240 subcarriers) in the frequency axis and 4 consecutive OFDM symbols in the time axis. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the smallest subcarrier index in the SS / PBCH block is numbered starting from 0. In the first OFDM symbol in which PSS is transmitted, the base station does not transmit signals through the remaining subcarriers, namely subcarriers 0-55 and 183-239. In addition, in the third OFDM symbol in which SSS is transmitted, the base station does not transmit signals through subcarriers 48-55 and 183-191. The base station transmits the physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block, excluding the signals mentioned above.

[0059] [Table 2]

[0060] SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group containing three unique identifiers through three PSS and SSS combinations, such that each physical layer cell ID is part of only one physical layer cell identifier group. Thus, physical layer cell ID N cell ID =3N (1) ID +N (2) ID This represents 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 the physical layer identifier within the physical layer cell identifier group. (2) ID This can be uniquely defined by the following. The UE can detect the PSS and identify one of the three unique physical layer identifiers. In addition, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the PSS sequence d PSS (n) is as follows:

[0061]

number

[0062] Here,

number

number

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

[0064]

number

[0065] Here,

number

number

[0066] A radio frame with a length of 10 ms can be divided into two half-frames with a length of 5 ms. Referring to Figure 4b, the slot in which the SS / PBCH block is transmitted within each half-frame is described. The slot in which the SS / PBCH block is transmitted may be any one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at 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 at carrier frequencies below 3 GHz. In addition, n may be 0 or 1 at carrier frequencies above 3 GHz and below 6 GHz. In Example 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 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at carrier frequencies above 3 GHz and below 6 GHz. In Example 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 is 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 18 at carrier frequencies above 6 GHz. In Example 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, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0067] Figures 5a and 5b illustrate the procedures for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, a base station may add a cyclic redundancy check (CRC) masked (e.g., by XOR operation) using a radio network temporary identifier (RNTI) to the 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 piece of control information. A common RNTI used by one or more UEs may include at least one of the following: system information RNTI (SI-RNTI), paging RNTI (P-RNTI), random access RNTI (RA-RNTI), and transmit power control RNTI (TPC-RNTI). In addition, UE-specific RNTIs may include at least one of the following: cell temporary RNTI (C-RNTI) and CS-RNTI. Subsequently, the base station may 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 the DCI based on a control channel element (CCE)-based PDCCH structure (S208). In addition, the base station may apply additional processes such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI (S210), and then map the DCI to the resources to be transmitted. A CCE is the basic resource unit for a PDCCH, and one CCE may contain multiple (e.g., six) resource element groups (REGs). One REG may consist of multiple (e.g., twelve) REs. The number of CCEs used for one PDCCH may be defined as the aggregation level.In 3GPP NR systems, aggregation levels 1, 2, 4, 8, or 16 may be used. Figure 5b is a diagram relating CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for a single PDCCH and the CCE transmitted within the control area accordingly.

[0068] Figure 6 shows the control resource set (core set) that a physical downlink control channel (PDCCH) can transmit within in a 3GPP NR system.

[0069] A coreset is a time-frequency resource in which PDCCHs, i.e., control signals for the UE, are transmitted. In addition, a search space, which will be described later, may be mapped to a coreset. Thus, a UE may monitor a time-frequency domain designated as a coreset, rather than monitoring all frequency bands for PDCCH reception, and can decode the PDCCH mapped to the coreset. A base station may configure one or more coresets per cell for the UE. A coreset may be configured using up to three consecutive symbols on the time axis. In addition, a coreset may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of Figure 6, coreset #1 is configured using consecutive PRBs, and coresets #2 and #3 are configured using non-contiguous PRBs. A coreset may be placed in any symbol within a slot. For example, in the embodiment of Figure 6, coreset #1 starts at the first symbol of the slot, coreset #2 starts at the fifth symbol of the slot, and coreset #9 starts at the ninth symbol of the slot.

[0070] Figure 7 shows a method for setting up the PUCCH search space in the 3GPP NR system.

[0071] To transmit a PDCCH to a UE, each core set may have at least one search space. In embodiments of this disclosure, the search space is a set of all time-frequency resources through which a UE's PDCCH can be transmitted (hereinafter, PDCCH candidates). The search space may include a common search space that all UEs of 3GPP NR are required to search in common, and terminal-specific or UE-specific search spaces that a particular UE is required to search. In the common search space, a UE may monitor a PDCCH that is set up to be searched in common by all UEs in a cell belonging to the same base station. In addition, UE-specific search spaces may be set up per UE so that a UE monitors a PDCCH allocated to each UE at different search space locations according to the UE. In the case of UE-specific search spaces, the search spaces between UEs may partially overlap or be allocated due to the limited control area through which a PDCCH is allocated. Monitoring a PDCCH involves blind decoding to find PDCCH candidates in the search space. When blind decoding is successful, it may be expressed that the PDCCH has been (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH has not been detected / received, or has not been successfully detected / received.

[0072] For the sake of explanation, a PDCCH scrambled using a group-common (GC) RNTI previously known to one or more UEs to send DL control information to one or more UEs is called a group-common (GC) PDCCH or common PDCCH. In addition, a PDCCH scrambled using a terminal-specific RNTI already known to a particular UE to send UL scheduling information or DL ​​scheduling information to a particular UE is called a UE-specific PDCCH. Common PDCCHs may be contained within a common search space, and UE-specific PDCCHs may be contained within a common search space or within a UE-specific PDCCH.

[0073] A base station may signal to each UE or UE group via the PDCCH about information relating to resource allocation for the transmission channels, namely the paging channel (PCH) and the downlink-shared channel (DL-SCH) (i.e., DL permission), or information relating to resource allocation for the uplink-shared channel (UL-SCH) and Hybrid Automatic Retransmission Request (HARQ) (i.e., UL permission). The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data, excluding certain control information or certain service data, via the PDSCH. In addition, UEs may receive data, excluding certain control information or certain service data, via the PDSCH.

[0074] A base station may include information in a PDCCH about where the UE(s) PDSCH data will be transmitted to and how the corresponding UE will receive and decode the PDSCH data, and may transmit such a PDCCH. For example, suppose a DCI transmitted on a particular PDCCH is CRC masked using an RNTI named "A", and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency location) named "B", and indicates transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) named "C". A UE monitors the PDCCH using the RNTI information it possesses. In this case, if there is a UE performing blind decoding of the PDCCH using the RNTI of "A", that UE will receive the PDCCH and, through the received PDCCH information, receive the PDSCH indicated by "B" and "C".

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

[0076] [Table 3]

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

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

[0079] - HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or to the DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter, NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used in conjunction with HARQ-ACK / NACK and ACK / NACK. Generally, ACK may be represented by a bit value of 1, and 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. Multi-input multiple-output (MIMO) related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0081] The 3GPP NR system may use five PUCCH formats to support various service scenarios, channel environments, and frame structures.

[0082] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis. When PUCCH format 0 is transmitted through two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. In this case, the sequence may be a sequence that has been cyclically shifted (CS) from the base sequence used in PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal is M bit Bit UCI(M bit =1 or 2) The cyclic shift (CS) value m cs It is possible to determine this. Also, a basic series of length 12 can be determined by a defined CS value m cs Based on this, a cyclically shifted sequence can be mapped to 12 REs, each consisting of one OFDM symbol and one RB, and transmitted. The number of cyclic shifts available to the terminal is 12, and M bit If = 1, then the 1-bit UCI 0 and 1 can be mapped to two cyclically shifted sequences, respectively, where the difference in cyclic shift values ​​is 6. Also, M bit If = 2, the 2-bit UCIs 00, 01, 11, and 10 can each be mapped to four cyclically shifted sequences, each with a cyclic shift value difference of 3.

[0083] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via a continuous sequence of OFDM symbols on the time axis and a single PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. For more details, see M bit UCI with =1 is modulated by BPSK. The terminal is M bitThe UCI, which is equal to 2, is modulated using QPSK (quadrature phase shift keying). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. The terminal transmits the obtained signal by spreading it with time-axis OCC (orthogonal cover code) to the even-numbered OFDM symbols to which PUCCH format 1 is assigned. The maximum number of different terminals that can be multiplexed with the same RB is determined by the length of the OCC used in PUCCH format 1. The DMRS (demodulation reference signal) is spread with OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0084] PUCCH format 2 can deliver UCIs of more than 2 bits. PUCCH format 2 can be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted through two OFDM symbols, the sequences transmitted through the two OFDM symbols in different RBs may be the same as each other. Here, the sequence is a plurality of modulated complex value symbols d(0),...,d(M symbol -1) is acceptable. Here, M symbol is M bit It may be / 2. Through this, the UE can obtain frequency diversity gain. More specifically, M bit Bit UCI(M bit >2) is bit-level scrambled, QPSK modulated, and mapped to one or two OFDM symbols, where the number of RBs can be one between 1 and 16.

[0085] PUCCH format 3 or PUCCH format 4 can deliver UCIs of more than 2 bits. PUCCH format 3 or PUCCH format 4 can be transmitted through a sequence of 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 uses π / 2-2 phase shift keying (BPSK) or QPSK for M bit Modulate the bit UCI (Mbit>2) to obtain the complex value symbol d(0)~d(M symb -1) is generated. Here, when using π / 2-BPSK, M symb =M bit And when using QPSK, M symb =M bit The value is / 2. The UE does not have to apply block-based spread to PUCCH format 3. However, the UE may apply block-based spread to one RB (i.e., 12 subcarriers) using a 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 and maps it to each RE to transmit the spread signal.

[0086] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of the UCI transmitted by the UE. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together through PUCCH. If 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 an RRC signal 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 the RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceil(N / 2) OFDM symbols.

[0088] PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured to be transmitted repeatedly in multiple slots. In this case, the number K of slots in which the PUCCH is transmitted repeatedly may be determined by the RRC signal. The repeatedly transmitted PUCCH must begin at a fixed position OFDM symbol in each slot and must be of a constant length. When one of the OFDM symbols in a slot in which the UE is to transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE does not have to transmit the PUCCH in the corresponding slot and may delay the transmission of the PUCCH until the next slot in which it is to be transmitted.

[0089] On the other hand, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the carrier (or cell) bandwidth. To this end, a terminal may have a bandwidth part (BWP) consisting of a contiguous portion of the carrier bandwidth. A terminal operating by TDD or in an unpaired spectrum may have up to four DL / UL BWP pairs per carrier (or cell). A terminal can also activate one DL / UL BWP pair. A terminal operating by FDD or in a paired spectrum may have up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per uplink carrier (or cell). A terminal can activate one DL BWP and one UL BWP for each carrier (or cell). A terminal does not need to receive or transmit using time-frequency resources other than the activated BWPs. Activated BWPs can be called active BWPs.

[0090] A base station can indicate to a terminal which of the configured BWPs (bandwidth points) are activated using downlink control information (DCI). The BWP indicated in the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD mode, the base station may include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI that schedules a PDSCH or PUSCH to change the terminal's DL / UL BWP pair. The terminal can receive the DCI that schedules the PDSCH or PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD mode, the base station may include a BPI indicating the activated BWP in the DCI that schedules a PDSCH to change the terminal's DL BWP. In an uplink carrier (or cell) operating in FDD mode, the base station may include a BPI indicating the activated BWP in the DCI that schedules a PUSCH to change the terminal's UL BWP.

[0091] Figure 8 is a conceptual diagram illustrating career integration.

[0092] Carrier aggregation is a method by which a wireless communication system uses a wider frequency band by allowing a UE (Unified Element) to use multiple frequency blocks or cells (in a logical sense) composed of UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band. A single component carrier may also be referred to as a primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, for the sake of explanation, the term "component carrier" will be used below.

[0093] Referring to Figure 8, as an example of a 3GPP NR system, the overall system bandwidth may include up to 16 component carriers, each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically continuous subcarriers. Although Figure 8 shows that each component carrier has the same bandwidth, this is just an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown as adjacent to each other on the frequency axis, the diagram is shown in a logical concept, and each component carrier may be physically adjacent to each other or separated from each other.

[0094] A different center frequency may be used for each component carrier. Alternatively, a single common center frequency may be used for physically adjacent component carriers. In the embodiment shown in Figure 8, assuming that all component carriers are physically adjacent, center frequency A may be used for all component carriers. Furthermore, assuming that the component carriers are not physically adjacent to each other, center frequencies A and B may be used for each component carrier.

[0095] When the entire system bandwidth is extended by carrier aggregation, the frequency bandwidth used for communication with each UE can be defined in units of component carriers. UE A may use the entire system bandwidth of 100 MHz and communicate using all five component carriers. UEs B1-B5 may use only 20 MHz bandwidth and communicate using one component carrier. UEs C1 and C2 may use 40 MHz bandwidth and communicate using two component carriers each. The embodiment in Figure 8 shows that UEC1 uses two non-adjacent component carriers and UEC2 uses two adjacent component carriers.

[0096] Figure 9 illustrates single-carrier and multi-carrier communication. Specifically, Figure 9(a) shows a single-carrier subframe structure, and Figure 9(b) shows a multi-carrier subframe structure.

[0097] Referring to Figure 9(a), in FDD mode, a typical wireless communication system may perform data transmission or data reception through one DL band and one UL band, corresponding to these. In another specific embodiment, in TDD mode, the wireless communication system may divide a radio frame in the time domain into UL time units and DL time units, and perform data transmission or data reception through the UL / DL time units. Referring to Figure 9(b), three 20 MHz component carriers (CCs) may be aggregated into UL and DL, respectively, so that a 60 MHz bandwidth can be supported. Each CC may or may not be adjacent to each other in the frequency domain. Figure 9(b) shows an example where the bandwidths of the UL CC and DL CC are the same and symmetric, but the bandwidth of each CC may be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. DL / UL CCs allocated / configured to a particular UE through RRC are sometimes called the serving DL / UL CCs of that particular UE.

[0098] A base station may communicate with a UE by activating some or all of the UE's serving CCs, or by deactivating some of the CCs. The base station may change which CCs are to be activated / deactivated, and may change the number of CCs to be activated / deactivated. If the 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 to the UE is completely reconfigured or the UE is handed over. The CC that is not deactivated by the UE is called the Primary CC (PCC) or Primary Cell (PCell), and the CC that the base station can freely activate / deactivate is called the Secondary CC (SCC) or 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 may consist of DL resources only, or a combination of DL resources and UL resources. When carrier aggregation is supported, the coordination between the carrier frequencies of DL resources (i.e., DL CC) and UL resources (i.e., UL CC) may be indicated by system information. The 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 a SCell. The carrier corresponding to a PCell in DL is a DL PCC, and the carrier corresponding to a PCell in UL is a UL PCC. Similarly, the carrier corresponding to a SCell in DL is a DL SCC, and the carrier corresponding to a SCell in UL is a UL SCC. Depending on the UE capability, a serving cell may consist of one PCell and zero or more SCells. If a UE is in the RRC_CONNECTED state but is not configured for or does not support carrier aggregation, it will have only one serving cell configured using only PCells.

[0100] As described above, the term "cell" as used in carrier aggregation is distinct from the term "cell" which refers to several geographical areas where communication services are provided by a single base station or antenna group. That is, a single component carrier may also be called a scheduling cell, scheduled cell, primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, in order to distinguish between cells referring to several geographical areas and cells in carrier aggregation, in this disclosure, cells in carrier aggregation are referred to as CCs, and cells in geographical areas are referred to as cells.

[0101] Figure 10 shows an example where the cross-carrier scheduling technique is applied. When cross-carrier scheduling is set up, a control channel transmitted through the first CC can schedule a data channel transmitted through the first or second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set up, and DL / UL permissions transmitted within the PDCCH area of ​​the scheduling cell schedule the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists within the PDCCH area of ​​the scheduling cell. A PCell can essentially be a scheduling cell, and a particular SCell may be designated as a scheduling cell by a higher layer.

[0102] In the embodiment shown in Figure 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carriers #1 and #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured as a PDCCH that monitors CCs. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) upper-layer signaling, CIF is disabled, and each DL CC can send only a PDCCH to schedule its PDSCH without using CIF, according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE group-specific or cell-specific) upper-layer signaling, CIF is enabled, and a particular CC (e.g., DL PCC) may send not only a PDCCH to schedule the PDSCH of DL CC A using CIF, but also a PDCCH to schedule the PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not transmitted within another DL CC. Therefore, depending on whether cross-carrier scheduling is configured for the UE, the UE will either monitor a PDCCH without a CIF to receive a self-carrier scheduled PDSCH, or monitor a PDCCH with a CIF to receive a cross-carrier scheduled PDSCH.

[0103] On the other hand, Figures 9 and 10 show the subframe structure of a 3GPP LTE-A system, and the same or a similar configuration may be applied to a 3GPP NR system. However, in a 3GPP NR system, the subframes in Figures 9 and 10 may be replaced with slots.

[0104] Figure 11 is a block diagram showing the configurations of a terminal and a base station according to one embodiment of the present disclosure.

[0105] In the embodiments of this disclosure, the terminal can be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal may also be referred to as UE (User Equipment), STA (Station), MS (Mobile Subscriber), etc. Furthermore, in the embodiments of this disclosure, the base station may control and manage cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to the service area and have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may also be referred to as gNB (next Generation Node B) or AP (Access Point), etc.

[0106] As shown in the figures, 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 and process data inside the terminal 100. Furthermore, the processor 110 can control the overall operation of the terminal 100, including each unit, and control data transmission and reception between units. Here, the processor 110 may be configured to perform the operations described in the embodiments of this disclosure. For example, the processor 110 can receive slot configuration information, determine the slot configuration based on this information, and perform communication according to the determined slot configuration.

[0108] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 may be equipped with multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either internally or externally. In the figure, the communication module 120 is shown as a single integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

[0109] The cellular communication interface card 121 can transmit and receive wireless signals to and from at least one of a base station 200, an external device, or a server using a mobile communication network, and 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 may include at least one NIC module that uses a frequency band of less than 6 GHz. 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, or a server in accordance with a cellular communication standard or protocol in a frequency band of less than 6 GHz supported by the NIC module.

[0110] The cellular communication interface card 122 can transmit and receive wireless signals to and from at least one of a base station 200, an external device, or a server using a mobile communication network, and can provide cellular communication services in a second frequency band based on instructions from the processor 110. In one embodiment, the cellular communication interface card 122 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, an external device, or a server in accordance with a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by the NIC module.

[0111] The unlicensed band communication interface card 123 uses a third frequency band, which is an unlicensed band, to send and receive wireless signals with at least one of the base station 200, an external device, or a server, and provides communication services in the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses an unlicensed band. For example, the unlicensed band may be a band of 2.4GHz, 5GHz, 6GHz, 7GHz, or 5GHz or higher than 52.6GHz. At least one NIC module of the unlicensed band communication interface card 123 can communicate wirelessly with at least one of the base station 200, an external device, or a server, independently or dependently, 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 the control program used by the terminal 100 and various data associated with it. Such a control program may include a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, or a server.

[0113] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. Furthermore, the user interface 140 can output based on instructions from the processor 110 using various output means.

[0114] Next, the display unit 150 outputs various images to the display screen. The display unit 150 can output various display objects such as content executed by the processor 110 or user interfaces based on control instructions of the processor 110.

[0115] Furthermore, the base station 200 according to one 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 and process data within the base station 200. Furthermore, the processor 210 can control the overall operation of the base station 200, including each unit, and control data transmission and reception between units. Here, the processor 210 may be configured to perform the operations described in the embodiments of this disclosure. For example, the processor 210 can signal slot configuration information and communicate according to the signaled slot configuration.

[0117] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 220 may be equipped with multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either internally or externally. In the figure, the communication module 220 is shown as a single integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

[0118] The cellular communication interface card 221 can transmit and receive wireless signals to and from at least one of the terminal 100, external devices, and servers described above using a mobile communication network, and can provide cellular communication services in the first frequency band based on instructions from the processor 210. In one embodiment, the cellular communication interface card 221 may include at least one NIC module that uses a frequency band of less than 6 GHz. 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, external devices, and servers in accordance with a cellular communication standard or protocol in a frequency band of less than 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 in a second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 may include at least one NIC module that uses a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the terminal 100, an external device, and a server in accordance with a cellular communication standard or protocol of a frequency band of 6 GHz or higher that the NIC module supports.

[0120] The unlicensed band communication interface card 223 uses a third frequency band, which is an unlicensed band, to send and receive wireless signals with at least one of the terminal 100, an external device, or a server, and provides communication services in the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module that uses an unlicensed band. For example, the unlicensed band may be a 2.4GHz, 5GHz, 6GHz, 7GHz, or 5GHz band above 52.6GHz. At least one NIC module of the unlicensed band communication interface card 223 can communicate wirelessly with at least one of the terminal 100, an external device, or a server, independently or dependently, 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 Figure 11 are block diagrams according to one embodiment of the present invention, and the separately displayed blocks logically distinguish and show the elements of the device. Therefore, the above-described elements of the device may be mounted as a single chip or as 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. Furthermore, the user interface 140 and the display unit 150, etc., may be further provided in the base station 200 as needed.

[0122] Figure 12 shows a method for scheduling a physical uplink sharing channel in the time domain according to one embodiment of the present invention.

[0123] A terminal can transmit uplink data to a base station using PUSCH. A base station can schedule a terminal to transmit uplink data using PUSCH (PUSCH scheduling). i) As a Dynamic Grant (DG) method, a base station can perform PUSCH scheduling using DCI included in PDCCH. Or, ii) As a Configured Grant (CG) method, a terminal can transmit uplink data to a base station using PUSCH according to the resources and transmission method pre-configured by the base station for the terminal.

[0124] In this case, the DCI included in the PDCCH may include PUSCH scheduling information. For example, the DCI may include time-domain resource assignment (TDRA) and frequency-domain resource assignment (FDRA). The terminal can receive the DCI transmitted in the control resource set and search space and perform the operation indicated by the DCI (e.g., uplink data transmission using PUSCH). In this case, the format of the DCI for PUSCH scheduling may be DCI format 0_0, 0_1, or 0_2. The DCI of DCI format 0_0, 0_1, or 0_2 may be configured to include a TDRA field containing time-domain information for PUSCH. In this case, the time-domain information may include K2, which is the offset value between the slot from which the base station transmits the PDCCH and the slot from which the terminal transmits the PUSCH. The DCI may also include SLIV (Start and length indication value), which is a value that is a joint-coded value of the start symbol index (S) and the symbol length (L, number) of the PUSCH within the slot indicated by K2. When a terminal receives DCI in slot n, the slot on which PUSCH is scheduled is floor(n*2 μPUSCH / n*2 μPDCCH ) + K2 slot may be. μPUSCH and μPDCCH can represent the subcarrier spacing (SCS) of the cell where PUSCH is scheduled and the cell where PDCCH is received, respectively. floor(x) is a function that returns the largest integer that is equal to or less than x. In this specification, slot n can represent the slot indexed with index n.

[0125] Referring to Figure 12(a), the subcarrier interval between the cell where the terminal receives PDCCH and the cell where PUSCH is scheduled may be the same. In this case, if the terminal receives PDCCH in slot n and K2 is instructed to be 4, the slot where PUSCH is scheduled may be slot n + K2, i.e., slot n + 4.

[0126] There are two possible mapping types for scheduling a PUSCH: PUSCH mapping type A and PUSCH mapping type B. The range of values ​​that can be the starting symbol index and SLIV of a PUSCH may vary depending on the PUSCH mapping type. PUSCH mapping type A allows resource allocations that include a DMRS symbol, and the DMRS symbol may be located as the third or fourth symbol in the slot, depending on the value indicated by the higher layer. That is, in the case of PUSCH mapping type A, the index (S) of the starting symbol of the PUSCH is 0, and the length (L) of the PUSCH can be any value from 4 to 14 (12 in extended CP), depending on the position of the DMRS symbol. In PUSCH mapping type B, the first symbol of the PUSCH may be the DMRS symbol. Therefore, S can be any value from 0 to 13 (11 in extended CP), and L can be any value from 1 to 14 (12 in extended CP). Additionally, no single PUSCH must cross the slot boundary, and the sum of S and L must be less than or equal to 14 (12 in extended CP).

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

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

[0129] Hereinafter, the frequency resource allocation type will be described with reference to Fig. 13.

[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 together to form an RBG based on the number of RBs included in the BWP configured (set) on the terminal, and a bitmap for each RB is used to indicate whether or not the RBG is used. That is, the terminal can determine whether or not the corresponding RBG is used by using the bitmap transmitted from the base station. The number of PRBs included in one RBG may be set (configured) from the upper layer, and the more RBs included in the BWP configured (configured) on the terminal, the more PRBs may be set (configured). Referring to Figure 13(a), the BWP size configured (configured) on the terminal is 72PRB, and one RBG may consist of 4PRBs. In this case, the terminal may determine that 4 PRBs in ascending order from PRB0 constitute one RBG, and each RBG may be indexed from 0. That is, an RBG consisting of PRBs from PRB0 to PRB3 may be indexed as RBG0, and an RBG consisting of PRBs from PRB4 to PRB7 may be indexed as RBG1. The same method may be used to index up to RBG17, in which case the base station transmits a total of 18 bits (0 or 1) for each RBG to the terminal, and the terminal can determine whether or not the PRBs constituting the corresponding RBG are used based on the received 18 bits. In this case, if the bit value is 0, the terminal can determine that no PUSCH is scheduled for any of the PRBs constituting the corresponding RBG. If the bit value is 1, the terminal can determine that PUSCH is scheduled for all PRBs in the corresponding RBG. In this case, the bit values ​​may be applied in reverse. ii) The second type, frequency resource allocation type 1, may be a type that indicates information on a sequence of PRBs allocated by the size of the terminal's initial BWP or active BWP. Information about consecutive PRBs may be a resource indication value (RIV) value that combines the start index (S) and length (L) of the consecutive PRBs.Referring to FIG. 13(b), when the BWP size at the terminal is 50 PRBs and PUSCH is scheduled from 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 where PUSCH is scheduled based on the RIV value received from the base station. Specifically, the RIV may be calculated as N. size BWP *(L - 1)+S. N size BWP may be the size of the BWP set for the terminal. For example, if the RIV value received by the terminal is 452, since 452 = 50*(10 - 1)+2 is calculated, the terminal can determine that the start index of the consecutive PRBs where PUSCH is scheduled is 2 and the length is 10.

[0131] By means of the DCI of DCI formats 0_1 and 0_2 for scheduling PUSCH, the terminal may be set to use only one of the above two types of frequency resource allocation types from the upper layer or to use the two types dynamically. When the terminal is set to use the two types dynamically, the terminal can determine which type it is by using 1 bit of the MSB (most significant bit) of the FDRA field of the DCI.

[0132] There may be uplink shared channel transmission methods based on configured grants, such as those used for URLLC transmission. These configured grant-based uplink shared channel transmission methods may be described as grant-free transmissions. A configured grant-based uplink shared channel transmission method may involve the base station configuring resources available for uplink transmission to the terminal via higher layers (i.e., RRC signaling), and the terminal then transmitting uplink shared channels using these configured resources. Configured grant-based uplink shared channel transmission methods can be distinguished into two types depending on whether the DCI instructs activation or release. i) Type 1: A configured grant-based uplink shared channel transmission method may involve pre-configuring resources and transmission methods at higher layers. ii) Type 2: A configured grant-based uplink shared channel transmission method may involve configuring grant-based transmission at higher layers, with the DCI configuring the resources and methods for actual transmission.

[0133] Uplink transmission methods based on configured grants can support URLLC transmission. Therefore, to ensure high reliability, uplink transmissions may be repeated on multiple slots. In this case, the RV (redundancy version) sequence may be one of {0,0,0,0}, {0,2,3,1}, or {0,3,0,3}, and the RV corresponding to the mod(n-1, 4)+1 value may be used in the nth repeated transmission. That is, the RV corresponding to the remainder when n-1 is divided by 4 plus 1 may be used. Furthermore, a terminal configured to repeatedly transmit on the uplink channel can only start repeated transmission on the 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 on 8 slots, the terminal cannot start repeated transmission on the 8th slot. The terminal may terminate repeated transmissions when it reaches the number of repeated transmissions set in the upper layer, exceeds the cycle, or receives a UL grant with the same HARQ process ID. A UL grant can mean a DCI that schedules a PUSCH.

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

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

[0136] There are two possible types of repeated PUSCH transmissions performed by a terminal. i) First, let's describe type A of repeated PUSCH transmission. When a terminal receives DCIs in DCI formats format0_1 and 0_2 from a base station that are included in a PDCCH that schedules a PUSCH, the terminal can repeatedly transmit PUSCHs on K consecutive slots. The K value may be set from a higher layer or may be a value set for the terminal by being included in the TDRA field of the DCI. For example, referring to Figure 14(a), the terminal can receive a PDCCH that schedules a PUSCH in slot n, and the K2 value may be set from the DCI included in the received PDCCH. In this case, if the K2 value is 2 and the K value is 4, the terminal can start repeated PUSCH transmissions in slot n+K2 and can repeatedly transmit PUSCHs up to slot n+K2+K-1. That is, the terminal starts repeated PUSCH transmissions in n+2 and repeatedly transmits PUSCHs up to n+5. In this case, the resources in the time domain and frequency domain for transmitting a PUSCH in each slot may be the same as those indicated in the DCI. That is, a PUSCH may be transmitted with the same symbol and PRB(s) within a slot. ii) Next, PUSCH repetition transmission type B will be described. PUSCH repetition transmission type B may be a type used by a terminal to repeatedly transmit low-latency PUSCHs to satisfy the requirements of URLLC, etc. The terminal may set the symbol (S) at which the repeated transmission of a PUSCH begins and the length (L) of the repeated PUSCH in the TDRA field of the DCI transmitted by the base station. In this case, the starting symbol (S) and length (L) may be for a nominal PUSCH that is determined on an ad-hoc basis, rather than for an actual PUSCH that the terminal actually transmits. There may not be any other symbols between nominal PUSCHs that are set to be repeatedly transmitted. That is, nominal PUSCHs may be consecutive in the time domain. The terminal can determine the actual PUSCH from the nominal PUSCH. A nominal PUSCH may be determined to be one or more actual PUSCHs. The base station may set a symbol for PUSCH repetition transmission type B that is unavailable on the terminal.Symbols unavailable for type B repetitive PUSCH transmissions may be described as invalid symbols. A terminal can exclude invalid symbols from the resources configured for a nominal PUSCH transmission. As described above, nominal PUSCHs are configured to be repeated over consecutive symbols, but if invalid symbols are excluded, the resources for nominal PUSCH transmissions become discontinuous. An actual PUSCH may be configured to be transmitted over consecutive symbols configured for a single nominal PUSCH transmission, excluding invalid symbols. In this case, if the consecutive symbols cross a slot boundary, the actual PUSCH transmitted may be split based on the slot boundary. Invalid symbols may include downlink symbols configured by the base station for the terminal. Referring to Figure 14(b), a terminal may have a PUSCH transmission of 5 symbol length scheduled starting from the 12th symbol in the first slot (slot n), with 4 type B repetitive transmissions configured. In this case, the resource scheduled with the first nominal PUSCH(nominal#1) can contain the symbols (n,11), (n,12), (n,13), (n+1,0), and (n+1,1). The resource scheduled with the second nominal PUSCH(nominal#2) can contain the symbols (n+1,2), (n+1,3), (n+1,4), (n+1,5), and (n+1,6). The resource scheduled with the third nominal PUSCH(nominal#3) can contain the symbols (n+1,7), (n+1,8), (n+1,9), (n+1,10), and (n+1,11). A resource scheduled with the fourth nominal PUSCH (nominal#4) can contain the symbols (n+1,12), (n+1,13), (n+2,0), (n+2,1), and (n+2,2). In this case, symbol (n,k) refers to symbol k in slot n. That is, k can be a value from 0 to 13 in normal CP, and a value from 0 to 11 in extended CP.Invalid symbols may be set to symbols 6 and 7 in slot n+1. In this case, the last symbol of the second nominal PUSCH (nominal#2) may be excluded to determine the actual PUSCH, and the first symbol of the third nominal PUSCH (nominal#3) may be excluded. The first nominal PUSCH (nominal#1) may be divided by the slot boundary into two actual PUSCHs (actual#1 and actual#2) that are actually transmitted. 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 excluding the invalid symbols. Finally, the fourth nominal PUSCH (nominal#4) may be divided by the slot boundary into two actual PUSCHs (actual#5 and actual#6) that are actually transmitted. The terminal ultimately transmits the actual PUSCH that it intends to send. Each actual PUSCH must contain at least one DMRS symbol. Therefore, if PUSCH repeat transmission type B is set, and the total length of an actual PUSCH is one symbol, such an actual PUSCH may be omitted and not transmitted. This is because an actual PUSCH consisting of one symbol cannot contain any information other than DMRS.

[0137] Frequency hopping may be configured for uplink channel transmission in order to obtain diversity gain in the frequency domain.

[0138] In PUSCH repetitive transmission type A, either intra-slot frequency hopping, where frequency hopping occurs within a slot, or inter-slot frequency hopping, where frequency hopping occurs for each slot, may be configured on the terminal. If intra-slot frequency hopping is configured on the terminal, the terminal can divide the PUSCH in the time domain into two parts in the slot from which it is transmitted: half is transmitted with a scheduled PRB, and the other half is transmitted with a PRB that is the scheduled PRB plus an offset value. In this case, the offset value may be set to two or four values ​​depending on the active BWP size at the upper layer, and one of these values ​​may be set (instructed) on the terminal by DCI. If inter-slot frequency hopping is configured on the terminal, the terminal can transmit the PUSCH with a scheduled PRB in slots with even slot indices, and transmit the PUSCH with a PRB that is the scheduled PRB plus an offset value in odd-numbered slots.

[0139] In PUSCH repetition transmission type B, either inter-repetition frequency hopping, where frequency hopping occurs at nominal PUSCH boundaries, or inter-slot frequency hopping, where frequency hopping occurs for each slot, may be configured on the terminal. When inter-repetition frequency hopping is configured on the terminal, the terminal can transmit actual PUSCHs corresponding to odd-numbered nominal PUSCHs on the scheduled PRB, and transmit actual PUSCHs corresponding to even-numbered nominal PUSCHs on the PRB obtained by adding an offset value to the scheduled PRB. In this case, the offset value may be set to two or four values ​​depending on the active BWP size at the upper layer, and any one of these values ​​may be set (instructed) on the terminal by DCI. When inter-slot frequency hopping is configured on the terminal, the terminal can transmit PUSCHs on the PRB scheduled for slots with even slot indices, and transmit PUSCHs on the PRB obtained by adding an offset value to the PRB scheduled for odd-numbered slots.

[0140] When a terminal performs repeated PUSCH transmissions, if a symbol scheduled for PUSCH transmission in a particular slot overlaps with a semi-statically configured DL symbol or a symbol set for receiving an SS / PBCH block, the terminal does not need to transmit the overlapping PUSCH on the slot containing the overlapping symbol. Furthermore, the overlapping PUSCH may be postponed and not transmitted on the next slot either.

[0141] When a terminal receives a DCI in DCI format 1_0, 1_1, or 1_2 that schedules a PUCCH, it must transmit a PUCCH to the base station. In this case, the PUCCH may include uplink control information (UCI), and the UCI may include at least one of HARQ-ACK, SR (Scheduling Request), and CSI (Channel State Information). The HARQ-ACK may be an HARQ-ACK indicating whether the terminal has successfully received two types of channels. The first type may be a HARQ-ACK for a PDSCH when a PDSCH is scheduled to the terminal with a DCI in DCI format 1_0, 1_1, or 1_2. The second type may be a HARQ-ACK for a DCI when the DCI in DCI format 1_0, 1_1, or 1_2 is a DCI that instructs the release of a semi-persistent scheduling (SPS) PDSCH. For sending a PUCCH containing a HARQ-ACK, the "PDSCH-to-HARQ_feedback timing indicator" field of the DCI can indicate K1, which is a value related to the slot to which the scheduled PUCCH will be sent. Here, K1 may be a non-negative integer value. A DCI in DCI format 1_0 can indicate one of the following values ​​for K1: {0, 1, 2, 3, 4, 5, 6, 7}. The K1 values ​​that can be indicated in DCIs in DCI formats 1_1 and 1_2 may be set (configured) from the upper layers.

[0142] This section describes how the slot on which a PUCCH containing a first type HARQ-ACK is transmitted is determined. There may be an uplink slot where the last symbol on which a HARQ-ACK and its corresponding PDSCH are transmitted overlaps. In this case, if the index of the overlapping uplink slot is m, the terminal can transmit a PUCCH containing a HARQ-ACK on slot m+K1. The index of the uplink slot may be a value determined based on the subcarrier interval of the BWP on which the PUCCH is transmitted. When downlink slot aggregation is configured on the terminal, the last symbol on which a PDSCH is transmitted may mean the last scheduled symbol in the last slot on which a PDSCH is transmitted.

[0143] Figure 15 shows a scheduling method for a physical uplink control channel according to one embodiment of the present invention.

[0144] Referring to Figure 15, the subcarrier interval of the DL BWP where PDCCH is received, the subcarrier interval of the DL BWP where PDSCH is scheduled, and the subcarrier interval of the UL BWP where PUCCH is transmitted may be the same. The terminal can receive the PDCCH that schedules PDSCH and PUCCH from the base station in slot n. At this time, the DCI included in the PDCCH received in slot n can be set (instructed) to have a K0 value of 2 and a K1 value of 3. For example, if the last symbol transmitted for PDSCH is n+K0 (i.e., n+2), the terminal can transmit a HARQ-ACK for PDSCH on slot n+2+K1 (i.e., n+5). At this time, the HARQ-ACK for PDSCH may be included in PUCCH.

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

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

[0147] In PUCCH transmission, frequency hopping may be applied to obtain diversity gain in the frequency domain. When intra-slot frequency hopping is applied, the terminal divides the time domain of the slot on which to transmit a PUCCH into two halves, allowing half of the PUCCH to be transmitted on the first PRB and the other half on the second PRB. The first and second PRBs may be configured in the higher layer where the PUCCH resources are set. When inter-slot frequency hopping is applied, the terminal can transmit a PUCCH on the first PRB of slots with even slot indices and on the second PRB of slots with odd slot indices. Also, when performing repeated PUCCH transmission, if the symbols of a particular slot scheduled for PUCCH transmission overlap with semi-statically configured DL symbols or symbols set for receiving SS / PBCH blocks, the terminal does not need to transmit a PUCCH on the slot containing the overlapping symbols. The terminal can postpone transmitting untransmitted PUCCHs to the next slot. In this case, if the symbol for sending a PUCCH in the deferred slot does not overlap with the semi-statically configured DL symbol or the symbol set for receiving an SS / PBCH block, the terminal can send a PUCCH.

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

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

[0150] Referring to Figure 17, in a TDD situation, a "D" slot is a slot where all symbols are downlink symbols, a "U" slot is a slot where all symbols are uplink symbols, and an "S" slot may be a slot that is neither a "D" nor a "U" slot. In this case, an "S" slot may contain at least one flexible symbol. A repeating PUSCH transmission type B may be set for both the "S" and "U" slots. Even if the base station instructs the terminal to set (instruct) the nominal PUSCH length to 6 symbols, the actual PUSCH length may be 2, 3, or 4 due to slot boundaries and invalid symbols. Each repeating actual PUSCH may contain 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 a 6-symbol PUSCH transmission, the terminal must use a higher code rate when transmitting the same number of bits in a transport block (TB). Therefore, even if repeated transmission is set to improve coverage performance, a high coding rate must be used, which presents a problem in that it is difficult to secure coding gain. In other words, simply having a terminal repeatedly transmit a PUSCH using PUSCH repeated transmission type B does not solve the coverage problem. Also, a PUSCH consisting of a small number of symbols must include at least one DMRS symbol, and the fewer symbols that make up the actual PUSCH, the greater the DMRS overhead, which can reduce coverage performance for uplink channels and signals transmitted by terminals at the cell edge.

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

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

[0153] Hereinafter, a solution for improving the coverage performance by the PUSCH repeated transmission type B and the PUCCH repeated transmission described using FIGS. 17 and 18 will be described.

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

[0155] One or more actual PUSCHs may be combined to form a combined actual PUSCH, which may then be transmitted. Consecutive actual PUSCHs in the time domain can be combined to form a single combined actual PUSCH. "Consecutive in the time domain" can mean that there are no symbols between two consecutive actual PUSCHs. When a terminal combines and transmits repeatedly transmitted PUSCHs, the total number of symbols in the PUSCH, including the repeated transmissions, must not exceed the already set number of symbols. That is, the total number of symbols in a combined actual PUSCH transmitted for coverage improvement must not exceed the already set number of symbols. The already set number of symbols may be a value set by the base station on the terminal. The already set number of symbols may also be the maximum number of symbols that make up a slot. The maximum number of symbols that make up a slot may be 14 for a normal CP and 12 for an extended CP.

[0156] Figure 19 shows a method for coupling repeatedly transmitted PUSCH according to one embodiment of the present invention.

[0157] Referring to Figure 19(a), the number of symbols already set may be 14. Actual PUSCH#1 to actual PUSCH#3 can be combined to form combined PUSCH#1, and actual PUSCH#4 and actual PUSCH#5 can be combined to form combined PUSCH#2. Actual PUSCH #1 to actual PUSCH#6 consist of a total of 15 symbols. Therefore, the second symbol (symbol 13 in the second slot) may be dropped because it exceeds the number of symbols already set, which is 14. Consequently, the first symbol of actual PUSCH#6 (symbol 12 in the second slot) consists of only one symbol and may be dropped by PUSCH mapping type B. Referring to Figure 19(b), there may be no limit on the number of symbols that make up a PUSCH. Therefore, the two symbols of actual PUSCH#6 (symbols 12 and 13 in the second slot) are consecutive symbols and can be combined to form combined PUSCH#3, which the terminal can also transmit to the base station.

[0158] Figure 20 shows a method for combining repeatedly transmitted PUSCH signals according to one embodiment of the present invention.

[0159] When configuring the combined PUSCH described above, actual PUSCHs may be combined considering slot boundaries. Referring to Figure 20(a), the number of symbols already set may be 14. Symbols sent by consecutive actual PUSCHs starting from symbol 10 in the first slot may be combined, but in this case, the combination may be based on slot boundaries. That is, actual PUSCH#1 can constitute combined PUSCH#1, the next consecutive actual PUSCH#2 and actual PUSCH#3 can constitute combined PUSCH#2, and actual PUSCH#4 and actual PUSCH#5 can constitute combined PUSCH#3. Unlike Figure 19, since a slot boundary exists between actual PUSCH#1 and actual PUSCH#2, combined PUSCH#1 may be composed of actual#1 alone. The second symbol of actual PUSCH#6 (symbol 13 in the second slot) is a symbol that exceeds the already set number of symbols, 14, so it may be dropped. Therefore, the first symbol of actual PUSCH#6 (symbol 12 in the second slot) consists of one symbol and may therefore be dropped by PUSCH mapping type B. Referring to Figure 20(b), there may be no limit on the number of symbols that make up a PUSCH. Thus, the two symbols of actual PUSCH#6 (symbols 12 and 13 in the second slot) are consecutive symbols and can be combined to form combined PUSCH#4, and the terminal can also transmit combined PUSCH#4 to the base station. In this case, the number of symbols that make up a combined PUSCH may be limited. For example, the limited number of symbols may be between 2 and 14.

[0160] A terminal can generate a 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 within the slot can be combined to form a combined PUSCH. If the specific unit is a set of N symbols, the terminal can determine the set of symbols and combine the actual PUSCHs within the set of symbols to form a combined PUSCH. The set of symbols may be grouped sequentially in groups of N, starting from the first symbol of a slot or a 10ms radio frame. N may be a divisor of the number of symbols that make up the slot. For example, N may be 7 in a standard CP and 6 in an extended CP.

[0161] The base station can set (instruct) the terminal to configure the number of actual PUSCHs that make up a combined PUSCH. The combined PUSCH may be formed by combining actual PUSCHs according to the set number. For example, if the set number is K, the combined PUSCH may be formed by combining K actual PUSCHs starting from the first one. On the other hand, if the total number of actual PUSCHs is not a multiple of K, one of the combined PUSCHs may be composed of a number of actual PUSCHs corresponding to the remainder when the total number of actual PUSCHs is divided by K. Actual PUSCHs may be indexed in chronological order.

[0162] A combined PUSCH may be formed by combining actual PUSCHs that correspond to (or are contained within) a nominal PUSCH. A nominal PUSCH may be divided into one or more actual PUSCHs by slot boundaries or invalid symbols. Multiple actual PUSCHs divided from a nominal PUSCH can be combined to form a combined PUSCH. i) When multiple actual PUSCHs divided from a nominal PUSCH are combined to form a combined PUSCH, slot boundaries can be considered. That is, only actual PUSCHs in the same slot may 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 a nominal PUSCH are combined to form a combined PUSCH, temporal continuity can be considered. That is, a combined PUSCH may be formed only from consecutive actual PUSCHs. In this case, actual PUSCHs that are continuous in the time domain and contained in different slots can be combined to form a single combined PUSCH. That is, actual PUSCHs that are discontinuous in the time domain can form different combined PUSCHs. Regardless of slot boundaries, when actual PUSCHs that are continuous in the time domain form a single combined PUSCH, the number of symbols that make up the combined PUSCH may be limited. For example, the number of symbols that make up a combined PUSCH may be limited to the maximum number of symbols that make up one slot, or to the number of symbols that make up a slot required for coverage extension.

[0163] The base station can set (instruct) the terminal to specify the minimum number of symbols that make up a combined PUSCH. The base station can determine the minimum number of symbols that make up a combined PUSCH by considering at least one of the following: DMRS overhead, TB size, and coding rate. That is, a combined PUSCH may be formed by combining actual PUSCHs such that it has 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, then if A1 is smaller than M, the minimum number of symbols that make up a combined PUSCH is not satisfied, so an actual PUSCH of length A1 can be combined with an actual PUSCH of length A2 to form a combined PUSCH. On the other hand, if A1 + A2 is still smaller than M, then an actual PUSCH of length A3 can be combined to form a 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, the additional actual PUSCH does not need to be combined.

[0164] The base station can set (instruct) the terminal to specify the maximum number of symbols that make up a combined PUSCH. The base station can determine the maximum number of symbols that make up a combined PUSCH by considering at least one of the following: DMRS overhead, TB size, and coding rate. In this case, the maximum number may be 14 symbols. That is, a combined PUSCH may be constructed by combining actual PUSCHs such that the total length is less than or equal to the maximum number. For example, if the maximum number is M, and the lengths of the actual PUSCHs are A1, A2, and A3, then if A1 is less than M, but A1+A2 is greater than M, the total number of symbols exceeds the maximum number, so the actual PUSCH of length A1 does not need to be combined with the actual PUSCH of length A2. If A1+A2 is less than M, the total number of symbols does not exceed the maximum number, so the actual PUSCH of length A1 can be combined with the actual PUSCH of length A2 to form a combined PUSCH. A similar method may be used to determine whether or not to combine an actual PUSCH of A3 length. This ensures that the length of the combined PUSCH is kept 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 terminal to specify the minimum length of the actual PUSCH that must be combined. For example, in PUSCH repeat transmission type B, an actual PUSCH with a length of 1 symbol may be dropped or omitted without being transmitted. Therefore, the dropped or omitted actual PUSCH may be transmitted in combination with other actual PUSCHs. For example, if the minimum length of an actual PUSCH is M, and the lengths of the actual PUSCHs are A1, A2, and A3, then an actual PUSCH among A1, A2, and A3 with a length shorter than M can be combined with another adjacent actual PUSCH to form a combined PUSCH. In this case, the number of actual PUSCHs to be combined may be two. i) An actual PUSCH with a length shorter than the minimum length may be combined with the shorter of two adjacent actual PUSCHs. For example, actual PUSCH#2 in Figure 17 may be combined with actual PUSCH#3, which has a shorter length than actual PUSCH#1. By combining actual PUSCHs that would otherwise be dropped or omitted with other actual PUSCHs and transmitting them, the terminal can efficiently utilize resources that would otherwise be dropped or omitted. Furthermore, combining actual PUSCHs can reduce DMRS overhead and increase the data transmission rate. ii) An actual PUSCH with a length shorter than the minimum length may be combined with the longer actual PUSCH of two adjacent actual PUSCHs. For example, in Figure 17, actual PUSCH#2 may be combined with actual PUSCH#1, which has a longer length than actual PUSCH#3. This allows PUSCHs to be transmitted using resources in a relatively long time domain, which is effective in expanding coverage. iii) An actual PUSCH with a length shorter than the minimum length may be joined with the actual PUSCH that is located earlier in time than two adjacent actual PUSCHs.Since the PUSCH starts from an earlier time-domain resource and is transmitted for a longer period of time, coverage is expanded and latency is reduced. iv) An actual PUSCH with a length shorter than the minimum length may be coupled with the actual PUSCH located later in time of two adjacent actual PUSCHs. In latency-insensitive PUSCH transmissions, the PUSCH may be transmitted over a longer time-domain resource, which has the effect of expanding coverage.

[0166] A combined PUSCH may be constructed by combining the symbols included in a nominal PUSCH. In this case, the process by which the nominal PUSCH is divided into actual PUSCHs, as described above, may be omitted. That is, a combined PUSCH may be generated directly from a nominal PUSCH. i) The base station can set (instruct) the terminal to select the minimum number of symbols that constitute a combined PUSCH. The terminal can determine the number of symbols included in the nominal PUSCH. In this case, invalid symbols may be excluded. A combined PUSCH may be constructed from the minimum number of symbols included in the nominal PUSCH. Since it is the minimum number, a combined PUSCH may be constructed from more than the minimum number of symbols. A combined PUSCH may be constructed considering consecutive symbols and / or slot boundaries. Specifically, a combined PUSCH may be constructed from the minimum number of symbols included in the nominal PUSCH, and if there are consecutive symbols after the last symbol in the minimum number of symbols, the consecutive symbols may be further combined to construct the combined PUSCH. ii) When consecutive symbols cross the boundaries of slots, the slots that cross the boundaries do not need to be combined. That is, the symbols to be combined further may be symbols within the same slot. ii) The base station can set (instruct) the terminal to set the maximum number of symbols that make up a combined PUSCH. That is, if the number of symbols that make up a combined PUSCH exceeds the maximum number, a new additional combined PUSCH can be made. For example, the maximum number may be 14 or the maximum number of symbols that make up X slots. iii) The base station can set (instruct) the terminal to set the number of configurable combined PUSCHs. The terminal can determine the number of symbols that make up a nominal PUSCH. In this case, invalid symbols may be excluded. For example, if the number of symbols that make up a nominal PUSCH is S and the number of configurable combined PUSCHs is Y, then a combined PUSCH may consist of floor(S / Y) or ceil(S / Y) symbols.floor(x) is a function that returns the largest integer among the integers equal to or less than x. ceil(x) is a function that returns the smallest integer among the integers equal to or greater than x.

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

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

[0169] The frequency hopping described below may be applied regardless of whether a combined push is used.

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

[0171] Frequency hopping may be performed by dividing the total length of the repeatedly transmitted PUSCH in the time domain into two parts. i) The total length of the repeatedly transmitted PUSCH may be divided in half to determine the hopping boundary for frequency hopping, and the repeated PUSCH may be transmitted based on the determined hopping boundary. The total length of the repeatedly transmitted PUSCH is N PUSCH symb Therefore, 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) may be (Method a). Alternatively, the number of symbols of PUSCH constituting the first hop is 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) may be (Method b). For example, the total length of a repeatedly transmitted PUSCH may be the sum of the lengths of each actual PUSCH. Referring to Figure 21, when PUSCH repeat transmission type B is configured, the total length of the actual PUSCH, 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 Method a described above is applied, the symbols constituting the first hop may be 7 (from symbol 10 in the first slot to symbol 2 in the second slot). The symbols constituting the second hop may be 8 (symbol 3 in the second slot, symbols 6 to 10 in the second slot, and symbols 12 and 13 in the second slot). In this case, when the method of PUSCH repeat transmission type B is applied to the second hop, as mentioned above, a PUSCH consisting of 1 symbol is a DMRS symbol, so the terminal does not need to transmit a PUSCH consisting of 1 symbol (the first symbol of the second hop). When method b described above is applied, the first hop may consist of 8 symbols and the second hop may consist of 7 symbols. Thus, the terminal can transmit a PUSCH without dropping any symbols. As yet another example, if both the base station and the terminal know the symbol configuration information and the configuration for invalid symbols, the terminal can determine the hopping boundary so that no PUSCH consisting of 1 symbol occurs. That is, referring to Figure 21, if both the terminal and the base station know the symbol configuration, the terminal can transmit a PUSCH without dropping any symbols by applying method b to configure the first hop with 8 symbols and the second hop with 7 symbols. Also, the total length of a repeatedly transmitted PUSCH may be the same as the total length of a nominal PUSCH. Referring to Figure 22, the total length of a nominal PUSCH may be 18 symbols (Nominal #1 to Nominal #3). The first hop may consist of nine symbols (from symbol 10 in the first slot to symbol 4 in the second slot), and the second hop may consist of nine symbols (from symbol 5 in the second slot to symbol 13 in the second slot).The terminal can transmit the first hop and the second hop using frequency hopping. ii) The total length of the repeatedly transmitted PUSCH in i) above may be the length of one nominal PUSCH or the length of the longest actual PUSCH among the actual PUSCHs. The first hop, separated by i) and ii) above, may be transmitted on the first PRB, and the second hop may be transmitted on the second PRB. In this specification, the symbol of PUSCH / PUCCH or the PUSCH / PUCCH symbol may mean the symbol on which PUSCH / PUCCH is transmitted.

[0172] Consecutive PUSCH symbols may constitute the same hop. When a base station sets a terminal to repeatedly transmit a PUSCH, symbols to which consecutive actual PUSCHs are assigned may constitute a single hop. In this case, the number of symbols constituting a single hop may be a variable value rather than a fixed value. Referring to Figure 23, eight consecutive symbols (symbols 10 to 3 in the second slot) from the start symbol of the repeatedly transmitted PUSCH (symbol 10 in the first slot) to the invalid symbol (symbol 4 in the second slot) may constitute a single hop (first hop). Five consecutive symbols (symbols 6 to 10 in the second slot) from the symbol of the next repeatedly transmitted PUSCH (symbol 6 in the second slot) to the next invalid symbol (symbol 11 in the second slot) may constitute another hop (second hop). Two consecutive symbols from the symbol of the next repeatedly transmitted PUSCH (symbol 12 in the second slot) may constitute yet another hop (third hop). In this case, the first and third hops may be transmitted over the same frequency domain resource, or they may be transmitted over different frequency domain resources. Even if consecutive symbols are contained in different slots, they constitute a single hop, which reduces DMRS overhead compared to when a single hop consists only of symbols within the same slot. However, the number of hops may increase if invalid symbols are included within a single slot, potentially increasing DMRS overhead when DMRS should be assigned to each hop. However, in situations where the channel delay spread and channel change over time within a single slot are not large, the frequency domain resources used for odd-numbered hops (e.g., the first and third hops) may always be the same, and the frequency domain resources used for even-numbered hops (e.g., the second and fourth hops) may always be the same.By always setting the frequency domain resources used for odd-numbered and even-numbered hops to be the same, the problem of increasing DMRS overhead due to the increase in hops can be solved.

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

[0174] A single frequency hop may consist of a predetermined number of symbols. This predetermined number of symbols may be the maximum number of symbols that can constitute a single hop. In other words, if the number of consecutive symbols is less than the predetermined number of symbols, a hop may be composed of a number of consecutive symbols less than the predetermined number of symbols. The predetermined number may be a value set by the base station at 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, a hop may consist of the same number of symbols as the nominal PUSCH in chronological order. Downlink symbols or invalid symbols may be excluded from the symbols that constitute a hop. Referring to Figure 25, the number of symbols in a nominal PUSCH is 6. If consecutive PUSCH symbols in the time domain are considered as one hop, then the first hop may consist of 6 symbols (symbols 10 in the first slot to symbol 1 in the second slot), the second hop may consist of the next 6 symbols (symbols 2, 3, 6, 7, 8, and 9 in the second slot), and the third hop may consist of the remaining symbols (symbols 12 and 13 in the second slot). In this case, since consecutive symbols can be transmitted as one hop, symbol 10 in the second slot has no surrounding symbols to be grouped into a single hop. Therefore, when PUSCH repeat transmission type B is applied, symbol 10 in the second slot does not need to be transmitted because it is a PUSCH with a length of 1 symbol. In this case, the first and third hops may be transmitted using the same frequency domain resources. As yet another example, the already set specific number may be any one of the divisors of the total number of symbols in the repeated PUSCH. The actual total number of symbols in the PUSCH is N, and N may be a natural number rather than a decimal. The number of symbols that make up a single hop may be any number of divisors of N, excluding 1 and N. In other words, a single hop may consist of a specific number of symbols, either consecutive or non-consecutive.Furthermore, if a single-symbol PUSCH exists after a hop has been formed with a specific number of consecutive symbols, that single-symbol PUSCH may be dropped. Specifically, the specific number of symbols may be the largest divisor of N excluding 1 and N. By determining the largest number as the number of symbols that constitute one hop, it is possible to transmit PUSCH over a longer time domain using the same PRB, thus extending coverage. Referring to Figure 26(a), when the total number of symbols (N) of the actual PUSCH is 15, the largest of the remaining divisors of 15 excluding 1 and 15, which is 5, may be determined as the number of symbols that constitute one hop. That is, the terminal can form a hop with 5 PUSCH symbols that are consecutive or non-consecutive in chronological order starting from the symbol that starts the repeatedly transmitted PUSCH (symbol 10 in the first slot). ii) The specific number of symbols may be the smallest divisor of N excluding 1 and N. By determining the minimum number of symbols that make up one hop, the hopping period is shortened, and consequently, hop transmissions on other PRBs can occur more frequently in a shorter time domain. Referring to Figure 26(b), when the total number of symbols (N) of the actual PUSCH is 15, the smallest divisor of 15 excluding 1 and 15, which is 3, may be determined as the number of symbols that make up one hop. That is, the terminal can constitute one hop with three PUSCH symbols that are consecutive or non-consecutive in time, starting from the symbol that starts the repeatedly transmitted PUSCH (symbol 10 in the first slot). In this case, symbols 6 and 10 in the second slot are PUSCHs with a length of 1 symbol and do not need to be transmitted. In other words, regardless of whether they are consecutive or not, after a hop has been constituted with a certain number of symbols, PUSCHs with a symbol length of 1 that do not have consecutive symbols do not need to be transmitted.

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

[0176] When a specific unit is a symbol set, the base station can set (instruct) the terminal to specify the number (N) of symbols that make up the symbol set. The terminal can generate symbol sets by grouping N symbols at a time from the first symbol of a radio frame. A scheduled, repeatedly transmitted PUSCH may consist of a symbol set and a single hop. That is, the length of a symbol set may be the length of a single hop. PUSCHs included in odd-numbered symbol sets may be transmitted over the first PRB, and PUSCHs included in even-numbered symbol sets may be transmitted over the second PRB.

[0177] When a specific unit is a symbol set determined by a nominal PUSCH, the number of symbols (N) constituting the symbol set may be the same as the length of the nominal PUSCH. A terminal can generate symbol sets by grouping N symbols at a time, starting from the first symbol in which the nominal PUSCH is scheduled. At this time, the base station can set (instruct) the terminal to use a natural number (K) to adjust the number of symbols constituting the symbol set. The terminal can generate symbol sets by grouping N*K symbols at a time, starting from the first symbol in which the nominal PUSCH is scheduled. That is, the natural number (K) can be used to expand the number of symbols included in the symbol set to a multiple of the length of the nominal PUSCH. A scheduled PUSCH may constitute one hop with 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 the first PRB, and PUSCHs included in even-numbered symbol sets may be transmitted on the second PRB.

[0178] When a specific unit is a slot set, the base station can set (instruct) the terminal to specify the number of slots (N) that make up the slot set. The terminal can generate slot sets in groups of N slots, starting from the first slot of a radio frame. A scheduled PUSCH may be composed of one hop by the aforementioned slot set. That is, the length of one slot set may be the length of one hop. PUSCHs included in odd-numbered symbol sets may be transmitted on the first PRB, and PUSCHs included in even-numbered symbol sets may be transmitted on the second PRB.

[0179] When a specific unit is a set of slots determined by a nominal PUSCH, the base station can set (instruct) the terminal to specify the number of slots (N) that make up the set of slots. The terminal can generate set of slots in groups of N slots, starting from the first slot in which a nominal PUSCH is scheduled. A scheduled PUSCH may constitute one hop with the set of slots. That is, the length of one set of slots may be the length of one hop. PUSCHs included in odd-numbered symbol sets may be transmitted on the first PRB, and PUSCHs included in even-numbered symbol sets 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) Frequency hopping may be determined based on the number of slots in which nominal pushers are scheduled. The number of slots in which nominal pushers are scheduled is N. PUSCH slot If so, 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 It may be ( / 2). Alternatively, the number of slots constituting the first hop is 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) may be the case. In this case, the first hop may be formed starting from the slot in which the nominal PUSCH is scheduled.

[0181] ii) Frequency hopping may be determined based on the number of slots in which actual PUSCH is scheduled. PUSCH slot Therefore, the number of slots constituting the first hop and the number of slots constituting the second hop may be determined in the same way as in i) above. In this case, the number of slots in which nominal PUSCH was scheduled but all nominal PUSCH symbols were excluded by invalid symbols is N. PUSCH slot It does not have to be included. In this case, the first hop may be formed starting from the slot where the nominal PUSCH is scheduled.

[0182] iii) Frequency hopping may be determined based on the number of symbols in the longest consecutive sequence of actual PUSCHs in the time domain. An actual PUSCH may be one or more actual PUSCHs that are repeatedly transmitted. That is, if a terminal is configured to repeatedly transmit a PUSCH from a base station, frequency hopping may be determined based on an actual PUSCH. In this case, actual PUSCHs with fewer symbols than the number of symbols that the terminal has configured as a single hop do not need to be hopped. For example, a terminal can configure a single hop with the number of symbols of the longest consecutive PUSCH in the time domain. The number of symbols in the longest PUSCH is N. PUSCH symb,max Therefore, the number of symbols that make up the first hop and the second hop is N PUSCH symb,max This may be the case. In other words, the terminal starts with the symbol for which PUSCH is scheduled, N PUSCHsymb,max The PUSCH transmitted with this symbol is transmitted on the first PRB, and subsequent N PUSCH symb,max A PUSCH transmitted with a number of symbols can be transmitted over the second PRB. As another example, one hop may consist of a number of symbols equal to the number of symbols in the longest PUSCH divided equally in the time domain. The longest number of symbols is N. PUSCH symb,max Therefore, 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) Alternatively, the number of symbols constituting 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) may be the case. In this case, the first hop may be constructed starting from the symbol that the actual PUSCH is scheduled for.

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

[0184] The following describes how to determine the location and number of DMRS symbols mapped to combined PUSCH. In this specification, DMRS symbols refer to symbols to which DMRS is mapped.

[0185] Figure 27 shows a method for determining the position of a symbol to which a DMRS included in a repeatedly transmitted PUSCH according to one embodiment of the present invention is mapped.

[0186] A terminal can determine the location of a DMRS symbol by considering all or part of the consecutive PUSCH symbols constituting a combined PUSCH as a single transmission group. In this case, the terminal can always map the DMRS to the first symbol of the consecutive PUSCH symbols constituting a single transmission group by applying only PUSCH mapping type B. When a base station sets (instructs) an additional DMRS symbol to a terminal, the base station can set the number of additional DMRS symbols to the terminal. The location of the additional DMRS symbol may be determined by the PUSCH mapping type. A single transmission group may be a series of consecutive PUSCH symbols or hops. Referring to Figure 27(a), the number of symbols in combined PUSCH#1, combined PUSCH#2, and combined PUSCH#3, which are each one transmission group, may be 8, 5, and 2, respectively. Based on the number of additional DMRS set by the base station, the terminal can map the additional DMRS to the symbol location determined by the PUSCH mapping type. In this case, the number of additional DMRS may be set at 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, PUSCHs with a length of 1 in the time domain do not need to 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 a maximum of seven. Therefore, the position of the DMRS symbol may be determined regardless of whether frequency hopping is configured or not. In other words, the DMRS symbol may be located in the same position as when frequency hopping is not configured (see Figure 27(a)).

[0187] The following describes a new method for performing repeated PUCCH transmissions to resolve the coverage problem (the limitation of UL symbols available for repeated transmissions) that occurs when repeated PUCCH transmissions are performed. The PUCCH format used for repeated PUCCH transmissions described below may be PUCCH format 1, 3, or 4, which consist of four or more symbols.

[0188] Figures 28 to 30 show a method for repeatedly transmitting a PUCCH according to one embodiment of the present invention. In Figure 28, actual#n refers to the actual PUCCH at index n, and virtual#n refers to the virtual PUCCH at index n.

[0189] PUCCH may be repeatedly transmitted regardless of slot boundaries. That is, PUCCH may be repeatedly transmitted on multiple slots in addition to a single slot. In other words, PUCCH can be repeatedly transmitted with symbols that include slot boundaries. The terminal can determine the time domain (interval) in which nominal PUCCH is transmitted based on the number of PUCCH symbols set by the base station and the number of PUCCH repetitions. The determined nominal PUCCH may be divided into actual PUCCH based on slot boundaries, DL symbols, and invalid symbols. Unlike PUCCH repetition type B, in order to guarantee PUCCH repetition as much as possible, invalid symbols within nominal PUCCH may be configured as virtual symbols, and the configured virtual symbols may be transmitted as UL symbols immediately following symbols that can be transmitted as PUCCH. Referring to Figure 28, nominal PUCCH may be divided into actual PUCCH#1 to actual PUCCH#6 based on slot boundaries, DL symbols, and invalid symbols. In this case, invalid symbols within the nominal PUCCH (symbols 4, 5, and 11 in the second slot) are formed into virtual PUCCH#1, which may be transmitted on the earliest of the next transmittable UL symbols. The actual PUCCH may consist of fewer than four symbols. Therefore, the terminal must combine each actual PUCCH to generate a combined PUCCH with a length of at least four symbols, because the PUCCH format used for repeated transmission of PUCCH must consist of 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 actual PUCCH and the second actual PUCCH may be combined. In this case, "adjacent" means consecutive, and means that there are no symbols between the first actual PUCCH and the second actual PUCCH. Referring to Figure 28, actual PUCCH#2 and actual PUCCH#3 are adjacent.Since there are two invalid symbols (symbols 4 and 5 in the second slot) between actual PUCCH#3 and actual PUCCH#4, actual PUCCH#3 and actual PUCCH#4 are not adjacent. There can be two adjacent actual PUCCHs. Referring to Figure 28, actual PUCCH#2 is adjacent to actual PUCCH#1 and actual PUCCH#3. Therefore, the terminal can select one PUCCH to join from two adjacent actual PUCCHs.

[0190] i) Of two adjacent actual PUCCHs, the shorter actual PUCCH may be selected. Referring to Figure 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 symbols or less may be dropped, but may be transmitted without being dropped through combination. Also, combining shorter actual PUCCHs can reduce the overhead of PUCCH DMRS and have the effect of increasing the data transmission rate. ii) Of two adjacent actual PUCCHs, the longer actual PUCCH may be selected. Referring to Figure 28, actual PUCCH#2 may be combined with actual PUCCH#1, which is the longer of actual PUCCH#1 and actual PUCCH#3. By selecting and combining longer actual PUCCHs, PUCCHs can be transmitted with resources for a longer time, which is effective in extending coverage. iii) Of two adjacent actual PUCCHs, the one that is earlier in time may be selected. Referring to Figure 28, actual PUCCH#2 may be combined with actual PUCCH#1, which is earlier in time than actual PUCCH#1 and actual PUCCH#3. This allows for PUCCH transmission over a longer time starting from the preceding time resource, thus resulting in coverage expansion and reduced delay for UCI transmissions including HARQ-ACK. iv) Of two adjacent actual PUCCHs, the one that is later in time may be selected. Referring to Figure 28, actual PUCCH#2 may be combined with actual PUCCH#3, which is later in time than actual PUCCH#1 and actual PUCCH#3. By combining with the later actual PUCCH, PUCCH transmissions including UCIs that are not sensitive to delay can be performed using a longer time resource, thus resulting in coverage expansion.

[0191] The length of the combined PUCCH formed by combining the first actual PUCCH and the second actual PUCCH may be 14 symbols or less. That is, the first actual PUCCH and the second actual PUCCH will not combine in a way that exceeds 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 combine to form a combined PUCCH with more than 14 symbols, then another adjacent third actual PUCCH may be selected to combine 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 sending it. When the terminal repeatedly sends a PUCCH that includes a slot boundary, the length of the repeatedly sent PUCCH does not need to exceed the already set number of symbols. The already set number of symbols may be a value that the base station sets on the terminal. The set number of symbols may be a value that the base station can set on the terminal, or it may be the maximum number of symbols that make up a slot. In another embodiment, when a PUCCH is transmitted on a resource that includes a slot boundary, the length of the PUCCH does not need to be limited. That is, the terminal can transmit a PUCCH to the base station on a resource that includes a slot boundary with no limit on the number of symbols. However, if the number of symbols is between 4 and 14, the PUCCH may be transmitted using the long PUCCH format described above. Also, when a PUCCH is composed on a resource that includes a slot boundary, the number of symbols available for PUCCH transmission may exceed 14. In such cases, since the existing PUCCH format consists only of 14 symbols or less, a new PUCCH format is needed that uses more than 14 consecutive symbols (hereinafter referred to as the extended PUCCH format). That is, the terminal can transmit a PUCCH composed in the form of the extended PUCCH format to the base station.Since the existing PUCCH format 1 has a sequence of DMRS symbols and symbols to which subsequent UCI is transmitted, an extended PUCCH format can be constructed 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 further mapped to symbols consecutive to that one symbol. A PUCCH consisting of 16 symbols may have a structure in which one DMRS symbol and one symbol for UCI transmission are further added to the existing PUCCH format 1. In an extended PUCCH format that is a partially modified version of the existing PUCCH format 3 or PUCCH format 4, the position of the symbols to which DMRS is mapped may be determined by the increased number of symbols. For example, if 1 to 3 symbols are added, the added symbols may be configured by mapping them in the order of UCI symbol, DMRS symbol, UCI symbol. In other words, if one symbol is added, the added symbol is a UCI symbol; if two symbols are added, the added symbols are a UCI symbol and a DMRS symbol; and if three symbols are added, the added symbols may be a UCI symbol, a DMRS symbol, and a UCI symbol. If four or more symbols are added, the same configuration as for the existing PUCCH format 3 or PUCCH format 4, which consists of 4 to 14 symbols, may be applied to the added symbols.

[0192] A base station can configure a resource area for transmitting recurring PUCCH messages, which may contain multiple start symbols and lengths. For example, a resource area for transmitting a PUCCH may contain two start symbols (S1, S2) and two lengths (L1, L2). A terminal can determine the symbol for the first recurring PUCCH from S1 and L1. A terminal can determine the symbol for the second recurring PUCCH from S2 and L2. In this case, the UCI may be included in both the first and second recurring PUCCH messages. In addition, the base station can also configure information regarding slot indices. In this case, the slot indicated by the slot index may be a slot containing the multiple start symbols and lengths described above. In this case, the first recurring PUCCH may be transmitted on the first slot, and the second recurring PUCCH may be transmitted on the second slot. On the other hand, if no information regarding the slot index is set, the first iteration PUCCH may be sent on the first slot determined based on the K1 value, and the second iteration PUCCH may be sent on 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 from which a PUCCH transmission is possible after the first slot. That is, if the slot immediately following the first slot does not contain a UL resource capable of sending a PUCCH, the second PUCCH may be sent on the slot containing the UL resource. As mentioned above, the K1 value may be the value indicated by DCI.

[0193] A base station can configure multiple PUCCH resources on a terminal, and each PUCCH resource may be configured with one start symbol and one length. The terminal can determine which symbols correspond to the one start symbol and one length from among the symbols in each slot where PUCCH is repeatedly transmitted, and determine whether the determined symbols are usable for PUCCH transmission. Among the symbols usable for PUCCH transmission, PUCCH may be repeatedly transmitted in the longest consecutive symbol interval. Referring to Figure 29, the base station can configure the terminal to set the start symbol (S) to 4 and the length (L) to 10, and to repeatedly transmit PUCCH in two slots. In other words, the base station has configured PUCCH to be transmitted using symbols 4 to 13. However, there may be cases where PUCCH cannot be transmitted in a slot using the symbol interval determined by the start symbol and length configured by the base station. Symbols 0 to 9 in the first slot cannot be used for PUCCH transmission. In this case, the first repeating PUCCH may be transmitted on symbols 10 to 13, which are the longest consecutive set of symbols available for PUCCH transmission within the set symbol interval. If flexible symbols are also available for PUCCH transmission, the first repeating PUCCH may be transmitted on symbols 8 to 13. Similarly, the second repeating PUCCH may be transmitted on symbols 6 to 10 in the second slot. On the other hand, if there are no symbols available for PUCCH transmission within a particular slot, or if the available symbol interval is less than 4 symbols, the particular slot will not be used for repeating PUCCH transmission. In other words, the number of repeating PUCCH transmissions will not be reduced.

[0194] Repeat transmission of PUCCH may occur simultaneously on inter-slot and intra-slot. When a base station configures a terminal to perform repeated PUCCH transmission on both the inter-slot and intra-slot, resources for PUCCH repeatedly transmitted on the intra-slot and resources for PUCCH repeatedly transmitted on the inter-slot may be configured. Alternatively, additional PUCCH resources may be configured in addition to the PUCCH resources configured on the intra-slot. That is, the PUCCH transmitted on the intra-slot is the first PUCCH to be repeatedly transmitted, and intra-slot resources may be further configured for the second PUCCH to be repeatedly transmitted. In this case, the starting position of the intra-slot resource for the second PUCCH to be repeatedly transmitted may be determined as "starting 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 Figure 30, a PUCCH with a starting symbol of symbol 10 and a length of 4 symbols may be configured to be repeatedly transmitted on the inter-slot. In this case, since the second slot allows for the inter-slot repeat transmission PUCCH from symbol 6 to the intra-slot repeat transmission, the inter-slot PUCCH and intra-slot PUCCH repeat transmissions may be performed simultaneously on the second slot.

[0195] The following describes a frequency hopping method for obtaining diversity gain when PUCCH repetitive transmission is performed to solve coverage problems.

[0196] The terminal can determine a frequency-hopping boundary for PUCCH repetition transmission based on a specific boundary. The information for determining the specific boundary is as follows: i) The specific boundary can be determined based on the PUCCH repetition transmission boundary. The terminal can transmit each repetitioned PUCCH using frequency hopping. Referring to Figure 28, the hopping boundary may be the boundary of a nominal PUCCH, the boundary of an actual PUCCH, or the boundary of a combined PUCCH. PUCCH may be repetitively transmitted by hopping between each nominal PUCCH, each actual PUCCH, or each combined PUCCH. Referring to Figure 29, the terminal can transmit PUCCH repetition #1 in the first slot and PUCCH repetition #2 in the second slot on different frequency domains using frequency hopping. Referring to Figure 30, the PUCCH repetition transmission boundaries between inter-slots and intra-slots can be frequency-hopping boundaries. The terminal can transmit the PUCCH of the first slot and the PUCCH of the second slot on different frequency domains. In this case, the intra-slot repeat transmission PUCCH added in the second slot may be configured with the same hop as the inter-slot repeat transmission PUCCH of the second slot and transmitted in the same frequency domain. Alternatively, the intra-slot repeat transmission PUCCH of the second slot may be configured with the same hop as the inter-slot repeat transmission PUCCH of the first slot and transmitted in the same frequency domain. In other words, multiple repeat transmission PUCCHs transmitted within a single slot may each be transmitted on different frequency domains. To put it another way, the intra-slot PUCCH and inter-slot PUCCH of the second slot may be transmitted on different frequency domains. ii) Slot boundaries may be determined based on slot boundaries, semi-statically configured DL symbols, and invalid symbols. Symbols available for consecutive / non-consecutive PUCCH repeat transmissions up to a slot boundary, semi-static DL symbol, or invalid symbol may be configured with the same hop.In other words, symbols available for consecutive / non-consecutive PUCCH repetitions prior to a slot boundary, semi-static DL symbol, or invalid symbol, and symbols available for subsequent consecutive / non-consecutive PUCCH repetitions, may be configured at different hops. Referring to Figure 28, actual PUCCH#1, actual PUCCH#2, and actual PUCCH#3, which consist of resources ahead of symbol 4 in the second slot (which is an invalid symbol), may be configured at the first hop. Actual PUCCH#4 and actual PUCCH#5, which consist of consecutive symbols available for PUCCH repetitions after symbol 4 in the second slot, may be configured at the second hop. Similarly, actual PUCCH#6 may be configured at the first hop. Referring to Figure 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 at different hops. Referring to Figure 30, the inter-slot repeat transmit PUCCH of the first slot may be configured as the first hop, and the intra-slot repeat transmit PUCCH and inter-slot repeat transmit PUCCH of the second slot may be configured as the second hop. Different hops may be transmitted over different frequency domains.

[0197] Hopping boundaries may be determined based on the number of symbols already set. That is, each of multiple hops may consist of the same number of symbols. The number of symbols already set can be obtained based on the PUCCH configuration information set by the base station. i) Hops may be composed of values ​​obtained by equally dividing the total number of symbols of the repeatedly transmitted actual PUCCH. Specifically, the number of symbols constituting the first hop is floor(N repeat PUCCH / 2) or ceil(N repeat PUCCH It may be ( / 2), and the number of symbols constituting the second hop is N repeat PUCCH / 2-floor(N repeatPUCCH / 2) or N repeat PUCCH / 2-ceil(N repeat PUCCH / 2) may be the case. repeat PUCCHThis refers to the total number of symbols in actual PUCCH. Referring to Figure 28, the total number of symbols in actual PUCCH is 15, so the first hop may consist of 7 symbols (symbol 10 in the first slot to symbol 2 in the second slot), and the second hop may consist of 8 symbols (symbols 3, 6-10, 12, and 13 in the second slot). Referring to Figure 29, the total number of symbols that make up PUCCH is 9, so the first hop may consist of 4 symbols (symbols 10-13 in the first slot), and the second hop may consist of 5 symbols (symbols 6-10 in the second slot). Referring to Figure 30, the total number of symbols that make up PUCCH is 12, so the first hop may consist of 6 symbols (symbols 10-13 in the first slot, and symbols 6 and 7 in the second slot), and the second hop may consist of 6 symbols (symbols 8-13 in the second slot). Alternatively, if the length of consecutive symbols in one hop is 2 or less, consecutive symbols of 2 or less may be included in another hop. In this case, the other hop may include symbols adjacent to consecutive symbols of 2 or less and may be a hop that can be transmitted in the same frequency domain. Referring to Figure 30, the second slot symbols 6 and 7 of the first hop may be included in the second hop and transmitted. ii) A hop can be constructed based on the minimum number of consecutive symbols among the total symbols of a repeatedly transmitted PUCCH. Referring to Figure 28, the minimum number of consecutive symbols is 2 (actual PUCCH#2, #3, #6). Therefore, one hop may consist of 2 symbols. Referring to Figure 29, the minimum number of consecutive symbols is 4 (PUCCH repetition#1). Therefore, the first hop may consist of 4 symbols (symbols 10-13 in the first slot), and the second hop may consist of 4 symbols (symbols 6-9 in the second slot). If the first and second hops are configured in this way, symbol 10 will remain in the second slot, but the terminal does not need to send PUCCH, which consists of a single symbol.That is, the terminal may drop symbol 10 from the second slot. Referring to Figure 30, the minimum number of consecutive symbols is 4. Therefore, the first hop may consist of 4 symbols (symbols 10-13 from the first slot), the second hop may consist of 4 symbols (symbols 6-9 from the second slot), and the third hop may consist of 4 symbols (symbols 13-13 from the second slot). iii) A hop may consist of a number of symbols that has already been set. In this case, the number of symbols that has already been set may be a value that the base station sets on the terminal. Alternatively, the number of symbols that has already been set may be the number of symbols that make up one PUCCH, i.e., the number of symbols of a PUCCH that is repeatedly transmitted. Referring to Figure 28, the number of symbols that has already been set may be 6. Therefore, the first hop may consist of 6 symbols (symbols 10 in the first slot to symbol 1 in the second slot), the second hop may consist of 6 symbols (symbols 2, 3, 6-9 in the second slot), and the third hop may consist of 3 symbols (symbols 10, 12, and 13 in the second slot). In this case, the first and third hops may be transmitted over the same frequency domain resource or over different frequency domain resources. Referring to Figure 29, the number of symbols already set may be the number of symbols in the initially configured PUCCH (10 in Figure 29). Therefore, all symbols in PUCCH repetition #1 and PUCCH repetition #2 may constitute one hop. Referring to Figure 30, the number of symbols already set may be the number of symbols in one PUCCH (4 in Figure 30). The first hop may consist of four symbols (symbols 10-13 in the first slot), the second hop may consist of four symbols (symbols 6-9 in the second slot), and the third hop may consist of four symbols (symbols 10-13 in the second slot). In this case, the first and third hops may be transmitted over the same frequency domain resource or over different frequency domain resources. iv) A single hop may be constructed based on the number of the longest consecutive symbols among the total symbols of the repeatedly transmitted PUCCH.For example, the number of symbols that make up one hop can be calculated by dividing the number of symbols in the longest consecutive sequence equally. Specifically, the number of symbols that make up 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) may be the case. repeat PUCCH This can be the number of consecutive symbols in the longest sequence. 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 / 2)) may be the number of symbols that make up one hop. min(ceiling(N repeat PUCCH / 2), N repeat PUCCH -ceiling(N repeat PUCCH / 2)) or max(ceiling(N repeat PUCCH / 2), N repeat PUCCH -ceiling(N repeat PUCCHThe value corresponding to ( / 2)) may be the number of symbols that make up one hop. max(a,b) is a function that returns the larger of a and b, and min(a,b) is a function that returns the smaller of a and b. Referring to Figure 28, the longest consecutive number of symbols is 8, which is the sum of the number of symbols in actual PUCCH#1, actual PUCCH#2, and actual PUCCH#3. Therefore, 4, which is 8 divided equally, could be the number of symbols that make up one hop. Referring to Figure 29, the longest consecutive number of symbols is 5, which is the number of symbols in PUCCH repetition#2. Therefore, 2 or 3 could be the number of symbols that make up one hop.

[0198] If the number of consecutive symbols is less than the number of symbols that make up a single hop, those symbols will not be hopped.

[0199] The following describes how to resolve coverage issues without combining multiple PUSCH instances.

[0200] Figures 31 and 32 show a repetitive transmission method of PUSCH according to one embodiment of the present invention.

[0201] A PUSCH may be transmitted over a resource that includes a slot boundary. The resource that includes a slot boundary may be configured so as not to exceed a previously set length. That is, a PUSCH transmitted over a resource that includes a slot boundary may be transmitted over a resource with a number of symbols less than or equal to a previously set number. The previously set length may be a value set by the base station on the terminal. Alternatively, the previously set length may be the maximum number of symbols that make up the slot. On the other hand, the length of the resource that includes a slot boundary does not have to be limited. That is, the terminal can transmit a PUSCH without a limit on the number of symbols. In this case, the position of the DMRS included in the PUSCH may be set by the base station. For example, if the length of the resource that includes a slot boundary is 14 symbols or less, the DMRS can be mapped in the same way as the existing PUSCH structure. If the length of the resource that includes a slot boundary exceeds 14 symbols, the structure of the existing PUSCH consisting of 1 to 14 symbols may be applied in the same way to the symbols exceeding 14 symbols. In other words, if the length of the resource including the slot boundary is 15 to 28 symbols and PUSCH mapping type B is applied, the front-loaded DMRS may be mapped to the first symbol (i.e., the 15th symbol) among the symbols exceeding 14. In addition, if additional DMRS are configured, the DMRS positions applied to the existing PUSCH consisting of 2 to 14 symbols can be applied identically to symbols exceeding 14 to map the additional DMRS.

[0202] A base station can configure a terminal to repeatedly transmit PUSCH on resources that include slot boundaries. In this case, the terminal can repeatedly transmit PUSCH based on a specific boundary. i) The specific boundary may be a slot boundary. That is, the terminal can determine the slot boundary as the basis for repeated transmission and repeatedly transmit PUSCH. Referring to Figure 31, PUSCH can be repeatedly transmitted on six symbols that include a slot boundary. If symbols 12 through 6 in slot n include a slot boundary, PUSCH may be repeatedly transmitted from symbol 12 in slot n to symbol 3 in slot n+1. ii) The specific boundary may be a virtual slot boundary. A virtual slot boundary is a newly defined slot boundary regardless of existing slot boundaries, and may be defined when PUSCH is transmitted on resources that include existing slot boundaries. Referring to Figure 32, a base station can configure a terminal to repeatedly transmit PUSCH for a length of 6 symbols starting from symbol 12 in slot n-1 across two slots. In this case, the first symbol of the repeatedly transmitted PUSCH (symbol 12 in slot n-1) can become the starting point of the virtual slot boundary. Then, PUSCH can be transmitted for the set number of repeated transmissions. That is, the symbol that starts the PUSCH transmission can become the first symbol of the virtual slot. The maximum number of symbols that make up the virtual slot may be equal to or greater than 14 for normal CP and 12 for extended CP.

[0203] DMRS contained in different PUCCHs and different PUSCHs that are repeatedly transmitted to improve PUCCH and PUSCH coverage may be joined and used for channel estimation.

[0204] In the existing system, DMRS contained in the repeatedly transmitted first PUCCH are used for channel estimation to decode the first PUCCH, and DMRS contained in the repeatedly transmitted second PUCCH are used for channel estimation to decode the second PUCCH. In other words, DMRS contained in different PUCCHs are each used only for the purpose of decoding the PUCCH that contains the DMRS. Below, we will explain how a base station can perform channel estimation (hereinafter referred to as joint channel estimation) by joining DMRS contained in different PUCCH / PUSCHs. The method described below will be explained using PUCCH as the basis for explanation, but it is obvious that it can also be applied to PUSCH.

[0205] Joint channel estimation conditions

[0206] - Same starting PRB index: The starting position of the PRB to which DMRS contained in different repeatedly transmitted PUCCHs are mapped must be the same in the frequency domain.

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

[0208] - Phase continuity: DMRS contained in different PUCCHs that are repeatedly transmitted must maintain the same phase.

[0209] - Same beamforming: DRMSs contained in different PUCCHs that are repeatedly transmitted must be set to the same beamforming.

[0210] - Same transmit power: DMRS contained in different PUCCHs that are repeatedly transmitted must be transmitted with the same transmit power.

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

[0212] The first DMRS contained in the repeatedly transmitted first PUCCH and the second DMRS contained 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. The above conditions must be met for the base station to combine the first DMRS and the second DMRS to perform channel estimation. The base station can perform channel estimation by combining the first DMRS and the second DMRS and receive the repeatedly transmitted first and second PUCCH based on the channel estimation result.

[0213] Joint channel estimation method

[0214] The following describes the specific method for joint channel estimation.

[0215] Figure 33 shows a method for setting the resources to which PUCCH is transmitted according to one embodiment of the present invention.

[0216] Referring to Figure 33, the base station can send the following information to configure the resources on which PUCCH is transmitted:

[0217] - Starting symbol index: The index of the symbol that initiates the transmission of PUCCH in the time domain.

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

[0219] - Starting PRB index: The PRB index in the frequency domain where PUCCH transmission begins.

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

[0221] - max code rate: The maximum code rate that a PUCCH can transmit. The terminal cannot transmit a PUCCH containing a UCI exceeding the maximum code rate.

[0222] The terminal must determine the number of PRBs to be used in the PUCCH format for transmitting PUCCH. First, the terminal can determine the number of bits (0 bits) of the UCI included in the PUCCH. The UCI may include the CRC (cyclic redundancy code). Then, the terminal can determine the number of REs (N) to which the UCI is mapped per PRB. The terminal can determine the number of REs excluding those to which the DMRS is mapped. When a PUCCH is transmitted over M PRBs, the sign rate may be calculated as O / (M*N*Q), where Q represents the modulation order used for PUCCH transmission. The calculated sign rate should be equal to or lower than the maximum sign rate; that is, O / (M*N*Q) ≤ maximum sign rate must be satisfied. PUCCH formats 2 and 3, which can utilize multiple PRBs, allow the number of PRBs to be adjusted so that the sign rate is equal to or less than the maximum sign rate. That is, from the number of possible PRBs (M), the minimum number of PRBs that satisfies O / (M*N*Q) ≤ maximum sign rate may be selected. In this case, the minimum value of selectable PRBs may be predetermined, and the number of PRBs that is not less than the minimum value may be selected. The number of REs (N) may be determined based on the number of symbols used in PUCCH transmission. The number of REs may increase as the number of symbols used in PUCCH transmission increases. Specifically, N is N sc,ctrl and N symb-UCI It may be given as the product of N. sc,ctrl This is the number of REs that send UCI with one symbol corresponding to one PRB. symb-UCI This is the number of symbols to send UCI. In PUCCH format 2, this is N. sc,ctrl It is 8, and in PUCCH format 3 it is N sc,ctrl N may be 12. In PUCCH format 2, symb-UCI This is the number of symbols used in PUCCH transmission, and in PUCCH format 3, N symb-UCI This may be the number of symbols used for PUCCH transmission, excluding the symbols to which DMRS is mapped.

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

[0224] Referring to Figure 34, PUCCH0 and PUCCH1 can each contain the same UCI. In this case, the length (number of symbols) of the resource transmitted by PUCCH0 and the length of the resource transmitted by PUCCH1 may be the same. Furthermore, PUCCH0 and PUCCH1 can occupy the same PRB. The number of PRBs may be determined by the method described above. PUCCH0 and PUCCH1 can each contain symbols to transmit DMRS. The base station can perform channel estimation by combining the DMRS of PUCCH0 (mapped to the 12th symbol in slot n) and the DMRS of PUCCH1 (mapped to the 2nd symbol in slot n+1). The base station can also receive the UCI transmitted by PUCCH0 and PUCCH1 using joint channel estimation. Referring to Figure 35, PUCCH0 and PUCCH1 can each contain the same UCI. In this case, the length of the resource transmitted by PUCCH0 and the length of the resource transmitted by PUCCH1 may be different from each other. PUCCH0 may be transmitted over 4 symbols, and PUCCH1 may be transmitted over 11 symbols. Since the lengths of the resources transmitted by PUCCH0 and PUCCH1 are different, the number of PRBs occupied by PUCCH0 and PUCCH1 may be different. For example, PUCCH0 transmitted over 4 symbols may occupy more PRBs than PUCCH1 transmitted over 11 symbols. The number of PRBs may be determined by the method described above. In the overlapping PRBs occupied by PUCCH0 and PUCCH1, DMRS can be combined to perform channel estimation. However, in non-overlapping PRBs, DMRS is not transmitted for PUCCH1, so joint channel estimation cannot be performed. Therefore, the base station may perform different channel estimations depending on the PRB, which may result in errors in the channel estimation value. The following describes how to overcome such errors. Furthermore, the method described later does not need to be applied when PUCCH is repeatedly transmitted via frequency hopping.

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

[0226] How to determine the number of PRBs

[0227] Method 1

[0228] i) The starting PRB index of each repeatedly transmitted PUCCH may be the same as the starting PRB index of the first PUCCH that is repeatedly transmitted. Referring to Figure 35, PUCCH0 and PUCCH1 consist of 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 first transmitted PUCCH is determined as the starting PRB index of the repeatedly transmitted PUCCH, there is a problem that joint channel estimation is possible for PRBs corresponding to low frequency domains, but not for PRBs corresponding to high frequency domains. ii) The last PRB index of each repeatedly transmitted PUCCH may be the same as the last PRB index of the first PUCCH that is repeatedly transmitted. The last PRB index is the index of the PRB corresponding to the highest frequency domain occupied by the PUCCH in the frequency domain, and may be calculated as the sum of the PRB start index and the number of PRBs. Referring to Figure 36, PUCCH0 and PUCCH1 may consist of different numbers of PRBs. In this case, the last PRB index of PUCCH1 is the last PRB index of PUCCH0. When the last PRB index of the first transmitted PUCCH is determined as the last PRB index of the repeatedly transmitted PUCCH, there is a problem that joint channel estimation is possible for PRBs corresponding to high frequency domains, but not for PRBs corresponding to low frequency domains. iii) The intermediate resources in the frequency domain of each resource of the repeatedly transmitted PUCCH may coincide. Referring to Figure 37, PUCCH0 and PUCCH1 may have different starting symbol indices. In this case, the intermediate resources in the frequency domain that constitute PUCCH0 and the intermediate resources in the frequency domain that constitute PUCCH1 may be set to coincide as much as possible.For example, the number of PRBs set in PUCCH0 may be M0 and the starting symbol index S0, while the number of PRBs set in PUCCH1 may be M1 and the starting symbol index S1. In this case, S1 can be obtained by dividing the difference between the PRBs set in PUCCH0 and PUCCH1 by 2 and applying this value to an already set function, then 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] In this case, f(x) may be one of ceil(x), floor(x), or round(x). round(x) can return an integer value obtained by rounding x. In this case, since S1 can be negative when M0 is greater than M1, S1 may be restricted to an integer equal to or greater than 0. That is, S1 may be calculated as max{0,S0+f((M0-M1) / 2)}. Since a PUCCH1 sent to a resource starting with S1 may cross the boundary of an active UL BWP, S1 may be restricted to a value where the last PRB index of PUCCH1 is located within the active UL BWP. That is, S1 may be min{N RB It can be calculated as -M1,S0+f((M0-M1) / 2)} N RB is the number of PRBs included in the active UL BWP. iv) The base station can set an offset value for the terminal. S1 may be calculated as S0 + offset. That is, the starting PRB index may be determined using the offset within a single frequency hop.

[0231] When Method 1 is used, joint channel estimation is not possible for PUCCH signals that are repeatedly transmitted in non-overlapping PRB regions; only separate estimation is possible.

[0232] Method 2

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

[0234] Figure 38 shows a case in which the same number of PRBs are set for each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention.

[0235] i) The same number of PRBs set for the first PUCCH to be repeatedly transmitted may be set for the remaining repeating PUCCHs. That is, the number of PRBs allocated to the repeating PUCCHs may be determined based on the number of symbols set for the first repeating PUCCH. In this case, the number of PRBs determined does not need to be related to the number of symbols allocated to each of the repeating PUCCHs. Referring to Figure 38, the number of PRBs allocated to PUCCH0 may be determined based on the four symbols used for PUCCH0 transmission. The same number of PRBs allocated to PUCCH0 may be allocated to PUCCH1. In this case, the number of PRBs is determined considering the maximum sign rate for PUCCH0, so it may not be suitable for the maximum sign rate for PUCCH1. For example, if the number of symbols allocated to the first repeating PUCCH, which is the earliest in time, is large, the maximum sign rate may be satisfied even with a small number of PRBs. Therefore, if the number of symbols for PUCCHs that are repeatedly transmitted after the first repeating transmission is small, the maximum sign rate may not be satisfied. ii) As mentioned above, the same number of PRBs set for the first PUCCH to be repeatedly transmitted may be set for the remaining PUCCHs to be repeatedly transmitted. In this case, the sign rate may be calculated for each PUCCH to be repeatedly transmitted. If the calculated sign rate is greater than the maximum sign rate, the terminal does not have to transmit that PUCCH. Resources set for a PUCCH that is not transmitted may be used for the repeated transmission of other adjacent PUCCHs. iii) The number of PRBs set for the PUCCH with the fewest symbols among the PUCCHs to be repeatedly transmitted may be determined as the number of PRBs to be set for the PUCCHs to be repeatedly transmitted. That is, the terminal can check the number of symbols assigned to each PUCCH to be repeatedly transmitted and determine the number of PRBs based on the PUCCH with the fewest symbols assigned. The determined number of PRBs may be applied regardless of the number of symbols assigned to the PUCCHs to be repeatedly transmitted.Referring to Figure 38, PUCCH0 may be assigned 4 symbols (3 symbols used for UCI transmission), and PUCCH1 may be assigned 11 symbols (9 symbols used for UCI transmission). Therefore, the number of PRBs for PUCCH0 with the fewest number of symbols assigned may become the number of PRBs for PUCCH1. In this case, when determining the fewest number of symbols, symbols mapped to DMRS may be excluded, and only symbols used for UCI transmission may be used. iv) The largest number of PRBs among those set for each PUCCH may be used for all PUCCH repeat transmissions. Referring to Figure 38, when the number of PRBs set for PUCCH0 is M0 and the number of PRBs set for PUCCH1 is M1, the larger value of M0 and M1 may be selected. PRBs corresponding to the selected value may be set for PUCCH0 and PUCCH1. v) Each PUCCH that is repeatedly transmitted may be set with the same number of PRBs. In other words, when a base station schedules the repeated transmission of a PUCCH, it can schedule the number of PRBs set for each PUCCH to be the same.

[0236] Method 3

[0237] Figures 39 and 40 show the PRBs for transmitting DMRS set for each of the repeatedly transmitted PUCCHs according to one embodiment of the present invention. In this case, the number of PRBs for transmitting DMRS set for each of the repeatedly transmitted PUCCHs may be the same.

[0238] i) Referring to Figure 39, the number of PRBs that do not exceed the maximum sign rate may be calculated for each repeatedly transmitted PUCCH. 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 of M0 and M1 may be used for DMRS transmission. That is, the DMRS contained in PUCCH1 may be transmitted with M0 PRBs. In other words, the DRMS ​​contained in each repeatedly transmitted PUCCH may all be transmitted with the same number of PRBs. In this case, the UCI may be transmitted on the PRBs required for each PUCCH transmission. The UCI contained in PUCCH1 may be transmitted with 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 number of PRBs set in two adjacent PUCCHs. As yet another example, the number of PRBs set to be the same may be determined based on the time interval between the symbols to which the DMRS are mapped. Referring to Figure 40, the interval between the DMRS symbol included in PUCCH0 (the 12th symbol in slot n) and the 1st DMRS symbol included in PUCCH1 (the 3rd symbol in slot n+1) may be less than or equal to a certain value (window for DMRS extension). In this case, the number of PRBs to which the DMRS included in PUCCH0 and PUCCH1 are mapped may be the larger of the number of PRBs set in PUCCH0 and the number of PRBs set in PUCCH1.

[0240] For DMRS contained in repeatedly transmitted PUCCH or PUSCH signals to be combined and used for channel estimation, their transmit power must be the same. The following describes how to set the transmit power to be the same (transmit power control).

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

[0242] [Table 4]

[0243] In other words, when a terminal transmits a PUSCH on the active UL BWP(b) of the carrier wave(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) can be determined as shown in Equation 3.

[0246]

number

[0247] K s β may be 1.25 or 0. If PUSCH contains UL-SCH, β offset PUSCH It may be 0. BPRE may be determined as shown in Equation 4.

[0248]

number

[0249] C is the number of code blocks that PUSCH sends, and K r This is the size (number of bits) of the r-th code block. RE This is the number of REs assigned to PUSCH, and can be calculated as shown in Equation 5.

[0250]

number

[0251]

number

number

number

[0252] N RE teeth,

number

[0253] The following describes a method for maintaining a constant push transmission power for joint channel estimation using DMRS.

[0254] Method for determining PUSCH transmission power

[0255] i) The terminal can calculate the transmit power of the first repeatedly transmitted PUSCH. N in Equation 5 RE This can be calculated using the number of symbols sent in the first repeatedly transmitted PUSCH. That is,

number

[0256] ii) The terminal can calculate the transmit power of the PUSCH transmitted on the fewest symbols among the repeatedly transmitted PUSCHs. The calculated transmit power of the PUSCH may then be used as the transmit power of all or some of the remaining repeatedly transmitted PUSCHs. Specifically, N in Equation 5 RE This may be calculated using the number of PUSCH symbols transmitted on the fewest symbols. That is,

number

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

[0258] iv) The terminal can individually calculate the transmission power of each repeatedly transmitted PUSCH. In this case, the largest value among the individually calculated transmission powers may become the transmission power of all repeatedly transmitted PUSCHs.

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

[0260]

number

[0261]

number

[0262]

number

[0263]

number

[0264]

number

[0265] In Equation 7,

number

number

[0266] Equation 8, which applies to PUCCH formats 2, 3, and 4, may be applied when the number of bits in the UCI is less than or equal to 11 bits, in which case K1 in Equation 8 may be 6. HARQ-ACK (i) + O SR (i) + O CSI (i) may be the number of bits in the UCI transmitted by PUCCH, in which case N represents the number of REs. RE (i) can be calculated as shown in Equation 10.

[0267] Equation 9, which applies to PUCCH formats 2, 3, and 4, may be applied when the number of bits in the UCI is greater than 11 bits, in which case K2 in Equation 9 may be 2.4. BPRE(i)=(O ACK (i) + O SR (i) + O CSI (i) + O CRC (i)) / N RE (i) may be O ACK (i) + O SR (i) + O CSI (i) + O CRC (i) may be the number of bits in the UCI transmitted by PUCCH, in which case N represents the number of REs. RE (i) can be calculated as shown in Equation 10.

[0268]

number

[0269] N sc,ctrl and N symb-UCI As stated above, the explanation is omitted. According to Equation 10, N RE is, N symb-UCIThe value may be proportional to the number of symbols transmitted in each repeatedly transmitted PUCCH. That is, if each repeatedly transmitted PUCCH has a different number of symbols, the transmit power may be determined differently. The transmit power of a PUCCH may be determined by the number of symbols transmitted in the PUCCH. Therefore, when each repeatedly transmitted PUCCH has a different number of symbols transmitted, a method is needed to determine the transmit power identically for joint channel estimation of the DMRS contained in each PUCCH.

[0270] Method for determining PUCCH transmission power

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

number

number

[0272] ii) The terminal can individually calculate the transmission power of each repeatedly transmitted PUCCH. In this case, the largest value among the individually calculated transmission powers may become the transmission power of all the repeatedly transmitted PUCCHs.

[0273] The following describes how to interpret the frequency hopping flag bits. A base station can set a terminal to a PUSCH repeat transmission mode of either PUSCH repeat type-A or PUSCH repeat type-B.

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

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

[0276] A DCI that schedules a PUSCH may have a 1-bit frequency hopping flag. The terminal can determine whether or not to perform frequency hopping from this flag.

[0277] When a base station sets inter-slot hopping of type-A PUSCH repetition on a terminal, the frequency hopping flag can instruct the terminal whether or not to perform inter-slot hopping. However, if the number of PUSCH repetitions is 1, the terminal can only send PUSCH on one slot. In other words, inter-slot hopping does not occur regardless of the frequency hopping flag. To put it another way, if inter-slot hopping is set and the number of PUSCH repetitions is 1, the bit value of the frequency hopping flag may determine whether or not to perform inter-slot hopping.

[0278] When a base station sets inter-slot hopping of type-B PUSCH repetition on a terminal, the frequency hopping flag can instruct the terminal whether or not to perform inter-slot hopping. However, if the repetitive PUSCH is transmitted only on the same slot, inter-slot hopping will not occur regardless of the frequency hopping flag. In other words, if inter-slot hopping is set and the repetitive PUSCH is transmitted only on the same slot, the value of the frequency hopping flag may determine whether or not to perform inter-slot hopping.

[0279] When a base station sets inter-slot hopping of type-B PUSCH repetition on a terminal, the frequency hopping flag can indicate whether or not to perform inter-slot hopping. However, if the number of repetitions of a PUSCH is 1, the terminal can only transmit the nominal PUSCH that is being repeated. Inter-slot hopping is performed based on the nominal PUSCH that is being repeated; therefore, if the number of repetitions of a PUSCH is 1, inter-slot hopping will not be performed regardless of the value of the frequency hopping flag. In other words, if the number of repetitions of a PUSCH is 1, the value of the frequency hopping flag may determine whether or not to perform inter-slot hopping.

[0280] When a terminal performs uplink transmissions (e.g., PUSCH and PUCCH), it can use frequency hopping to obtain diversity gain in the frequency domain. In an NR system, uplink transmissions can be performed with a maximum of two hops. Each hop can represent a different frequency band. The following describes how to determine the hops to obtain diversity gain in the frequency domain.

[0281] How to determine hops

[0282] When intra-slot hopping is configured, the terminal may be instructed by the base station to set (instruct) the index of the symbol that will initiate the uplink transmission and the number of consecutive symbols for the uplink transmission. Based on the index of the starting symbol and the number of consecutive symbols, the terminal 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 starting 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. To obtain diversity in higher frequency domains, the terminal can perform uplink transmission by configuring more than two hops. Specifically, the following describes how the terminal determines four hops when intra-slot hopping is configured.

[0284] If N is the number of symbols set for uplink transmission, then the number of symbols included in the first hop, second hop, third hop, and fourth hop may be determined based on N. First, N is the number of symbols included in the first and second hops (N 12 ) and the number of symbols (N) included in the 3rd and 4th hops 34It can be divided by N. 12 This is calculated as floor(N / 2), and N 34 This can be calculated using 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. Similarly, N 34 Based on this, the number of symbols in the third hop (N3) and the number of symbols in the fourth hop (N4) may be determined. Specifically, N1 to N4 may be calculated as shown in Equation 11.

[0285]

number

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

[0287]

number

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

[0289] [Table 5]

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

[0291] For example, a terminal transmits two uplink channels, each 14 symbols long and starting from the first symbol of a slot. In this case, the first uplink channel may be transmitted over 2 hops, and the second uplink channel over 4 hops. The first hop of the first uplink channel may consist of 7 symbols from the first symbol, and the second hop may consist of the remaining 7 symbols. That is, the boundary between the first and second hops of the first uplink channel may be between the 7th and 8th symbols of the slot. In other words, the boundary between the first and second hops of the first uplink channel may be at the point where the 7th symbol ends and the 8th symbol begins. The first hop of the second uplink channel may consist of 3 symbols from the first symbol, the second hop may consist of the next 4 symbols, the third hop may consist of the next 3 symbols, and the fourth hop may consist of the next 4 symbols. The second uplink channel may include the same boundary as the first uplink channel. In other words, the boundary between the second hop and the third hop of the second uplink channel is identical to the boundary between the first hop and the second hop of the first uplink channel. Therefore, frequency hopping may occur at the same boundary, and frequency hopping is effective in the multiplexing aspect between two uplink channels of the same length that start from the same symbol.

[0292] As yet another example, the first uplink channel may consist of 7 symbols, starting from the first symbol of the slot, and the second uplink channel may consist of 14 symbols, also starting from the first symbol of the slot. In this case, the first uplink channel may be transmitted in 2 hops, and the second uplink channel may consist of 4 hops. The first hop of the first uplink channel may consist of 3 symbols, starting from the first symbol, and the second hop may consist of the remaining 4 symbols. The boundary of the second hop of the first uplink channel may be between the third and fourth symbols of the slot. In other words, the boundary of the second hop of the first uplink channel may be where the third symbol ends and the fourth symbol begins. The first hop of the second uplink channel may consist of 3 symbols, starting from the first symbol, the second hop may consist of the next 4 symbols, the third hop may consist of the next 3 symbols, and the fourth hop may consist of the next 4 symbols. Thus, the second uplink channel may have the same boundary as the first uplink channel. In other words, the boundary between the first hop and the second hop of the second uplink channel may be the same as the boundary between the first hop and the second hop of the first uplink channel. Therefore, frequency hopping may occur at the same boundary, and frequency hopping is effective in the multiplexing aspect between two uplink channels of different lengths that start from the same symbol.

[0293] When the uplink channel is PUSCH and PUSCH is transmitted over a maximum of 4 hops, each hop may contain at least one DM-RS symbol. For example, when PUSCH consists of 14 symbols and is transmitted over 4 hops, the first hop may consist of 3 symbols, the second hop 4 symbols, the third hop 3 symbols, and the fourth hop 4 symbols, and each hop may contain at least one symbol to which a 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 A, the position of the symbol to which the DMRS is mapped must be determined. When PUSCH mapping type A is set, 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 set, the terminal can determine the hop that overlaps with the symbol to which the DMRS should be mapped. In this case, if there is a hop that overlaps with the symbol to which DMRS should be mapped, PUSCH may map and transmit DMRS at the corresponding hop. That is, DMRS may be mapped to the same position as the existing symbol to which DMRS should be mapped within the overlapping hop. The position of the symbol to which DMRS is mapped at hops that do not overlap with the symbol to which DMRS should be transmitted may be determined as in PUSCH mapping type B. That is, at hops that do not overlap with the symbol to which DMRS is mapped, DMRS may be mapped to the first symbol. Specifically, if PUSCH is set to 14 symbols and the mapping type is PUSCH mapping type A, it is possible that PBCH will map DMRS to the fourth symbol. As mentioned above, when PUSCH consists of 4 hops, the number of symbols at the first hop may be 3. Therefore, the fourth symbol does not exist at the first hop, and DMRS is not mapped.In this case, the terminal can consider the length of the first hop to be 4, and the lengths of other hops with a length of 4 to be 3. For example, according to Table 5, the first to fourth hops consist of 3, 4, 3, and 4 symbols, but the terminal can consider the length of the first hop to be 4, and the length of the second or fourth hop to be 3. For example, the terminal can consider the lengths of the first to fourth hops to be 4, 3, 3, and 4. Alternatively, the terminal can consider the lengths of each hop determined by Table 5 as the hop lengths for DMRS mapping by permutation combinations. For example, the terminal can consider the lengths of the first to fourth hops to be 4, 3, 4, and 3.

[0294] ii) If N is the number of symbols set for uplink transmission, the number of symbols included in the first hop, second hop, third hop, and fourth hop may be determined based on N. Specifically, the number of symbols included in the first to fourth hops (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 for each number of symbols N.

[0297] [Table 6]

[0298] According to Table 6, the number of symbols included in the first to fourth hops can differ by up to one symbol depending on the number of symbols N. Similar to method i) described above, method ii) is also effective in the multiplexing aspect between two uplink channels of the same length that start from the same symbol. Method ii) is also effective in the multiplexing aspect between 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 the slot, and a second uplink channel of length 9 that starts 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 transmitted in four hops. The first hop of the first uplink channel may consist of the third and fourth symbols of the slot, and the second hop may consist of the fifth to seventh symbols of the slot. The boundary between the first and second hops of the first uplink channel may be between the fourth and fifth symbols of the slot. The first hop of the second uplink channel may consist of the first two symbols, the second hop of the second hop of the third hop of the third hop of the third hop of the third hop of the fourth hop of the fourth hop of the second hop of the first uplink channel. Therefore, the second uplink channel may have the same boundary as the first uplink channel. That is, the boundary between the second hop and the third hop of the second uplink transmission is between the fourth and fifth symbols, and therefore can have the same boundary as the first uplink channel. Thus, frequency hopping may occur at the same boundary.

[0299] When a terminal transmits a PUSCH over a maximum of two hops, if the PUSCH and PUCCH overlap on a certain symbol, the UCI of PUCCH may be multiplexed with the PUSCH and transmitted. In this case, the UCI may be divided into two parts depending on the type of UCI, with half being multiplexed to the first hop and the other half to the second hop. The type of UCI may be HARQ-ACK, CSI part1, or CSI part2. For example, HARQ-ACK may be G as follows: ACK (1) and GACK (2) It can be divided into two parts. 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 Q is the number of layers in PUSCH. m This is the modulation order of PUSCH. HARQ-ACK is G ACK (1) Multiplexed to the first hop, G ACK (2) may be multiplexed to the second hop. CSI part 1 and CSI part 2 may also be multiplexed to their respective hops in the same manner.

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

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

[0303]

number

[0304]

number

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

[0306] ii) The terminal can divide the UCI and multiplex it across the four hops of PUSCH. In this case, the UCI may be divided into two halves depending on the type of UCI, with the first half being multiplexed across the first and second hops, and the remaining half being multiplexed across the third and fourth hops. Alternatively, the first half may be multiplexed across the first and third hops, and the remaining half being multiplexed across the second and fourth hops. That is, the UCI may be divided into two halves, and each divided UCI may be repeatedly transmitted across two hops. In this case, the sizes of the two divided UCIs (A,B) are 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, in contrast to dividing it into four, allows us to reuse the method defined in existing NR systems for determining the UCI size based on two hops, and is also effective in terms of reliability because the UCI can be repeatedly transmitted over two different hops.

[0309] iii) Even if PUSCH is configured to transmit over four hops, the terminal can split the UCI and transmit it over two hops. That is, the UCI is multiplexed and transmitted over two hops, and does not need to be multiplexed over the remaining two hops. The terminal can reuse the two-hop UCI size determination method defined in the existing NR system and does not need to repeat transmissions. Specifically, the method for selecting two hops out of four is as follows:

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

[0311] iii-b) The terminal can always choose the last two hops. That is, when PUSCH is divided into four hops, the terminal multiplexes and transmits the UCI at the third and fourth hops, which are the latest in time, and does not need to multiplex the UCI at the first and second hops, which are the earliest in time. The terminal can allocate time to multiplex the UCI in PUSCH. Additional processing time may be required for the terminal to multiplex the UCI in PUSCH. Compared to iii-a), iii-b) is easier to implement because there is more processing time available since the UCI is multiplexed at 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 of the PUSCH that overlap with the PUCCH may be selected. As yet another example, the latest hop and the hop before it 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 with the PUCCH may be provided.

[0313] iii-d) The terminal can choose two odd-numbered hops. That is, the terminal can multiplex and transmit the UCI at the first and third hops, but not at the second and fourth hops. Alternatively, the terminal can choose two even-numbered hops. That is, the terminal can multiplex and transmit the UCI at the second and fourth hops, but not at the first and third hops.

[0314] iii-e) The terminal can select the two hops that are furthest apart in the frequency domain. In the frequency domain, the distance may be calculated as the difference between the lowest PRBs of each hop. For example, when the first hop starts at PRB X1, the second hop starts at PRB X2, the third hop starts at PRB X3, and the fourth hop starts at 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 the UCI to the two selected hops and transmit it, and does not need to multiplex the UCI to the remaining two hops. iii-e) has an effect on the aspect of frequency diversity.

[0315] iii-f) A terminal can select two hops that have a large number of constituent symbols. For example, if PUSCH has 14 symbols and the number of symbols constituting the first, second, third, and fourth hops are 3, 4, 3, and 4, the terminal can multiplex the UCI to the second and fourth hops, but does not need to multiplex the UCI to the first and third hops.

[0316] When two hops are selected by the methods of iii-g)iii-a) to iii-f), hops that satisfy certain conditions may be excluded. The specific condition may be that the symbol to which the DMRS is mapped is located at the last symbol of the hop, because the UCI cannot be multiplexed to the symbol following the symbol to which the DMRS is mapped. Alternatively, the specific condition may be that the 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 terminal to set the hops on which the UCI is multiplexed. Such configuration may be set with the RRC signal or with the DCI.

[0318] The following describes a method for multiplexing UCIs using frequency hopping when PUSCH signals are repeatedly transmitted. A terminal can repeatedly transmit the same TB by repeatedly transmitting PUSCH signals. To improve coverage, DMRS signals between different repeatedly transmitted PUSCH / PUCCH signals may be combined and used for channel estimation.

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

[0320] Figures 42 and 43 show a method for multiplexing a repeatedly transmitted PUSCH and a UCI included in the repeatedly transmitted PUSCH according to one 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 the first symbol among the symbols on which the first PUSCH is scheduled, and the second DMRS may be transmitted on the second symbol among the symbols on which the second PUSCH is scheduled. Phase continuity must be satisfied when a terminal transmits DMRS on different repeatedly transmitted PUSCHs. That is, the first and second PUSCHs may be transmitted under the same beamforming conditions. Also, the first and second PUSCHs must be in the same QCL (quasi-co-locate). 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 can perform channel estimation by combining the first and second DMRSs and receive the repeatedly transmitted first and second PUSCHs based on the channel estimation result.

[0322] Of the repeatedly transmitted PUSCHs, some PUSCHs may be transmitted in the first frequency band, and the remaining PUSCHs may be transmitted in the 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 contain multiple repeatedly transmitted PUSCHs, and the second hop may contain other multiple repeatedly transmitted PUSCHs. Referring to Figure 41(a), the PUSCHs may be set to be repeatedly transmitted in four slots. In this case, with inter-slot frequency hopping, the first PUSCH may be repeatedly transmitted in the first slot, the second PUSCH in the second slot, the third PUSCH in the third slot, and the fourth PUSCH in the fourth slot. Here, the first and third frequency bands may be the same, and the second and fourth frequency bands may be the same. Referring to Figure 41(b), joint channel estimation may be set up. In this case, the first PUSCH iteration of the first slot and the second PUSCH iteration of the second slot may be transmitted in the first frequency band, and the third PUSCH iteration of the third slot and the fourth PUSCH iteration of the fourth slot may be transmitted in the second frequency band. The DMRS included in the first PUSCH iteration and the DMRS included in the second PUSCH iteration may be combined and used for channel estimation in 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 in the second frequency band.

[0323] UCI Multiplexing Method

[0324] UCIs included in a 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 UCIs will not be able to obtain frequency diversity. The following describes how UCIs can obtain frequency diversity. The term "PUSCH repetition" as described herein may have the same meaning as "a repeatedly transmitted PUSCH."

[0325] When multiple repetitive PUSCH signals are set for each frequency band (each hop), one PUSCH signal may be selected for each frequency band. i) The earliest PUSCH signal in each frequency band (each hop) may be selected. Referring to Figure 41(b), the first frequency band (first hop) may have a first PUSCH repetition and a second PUSCH repetition, in which case the first PUSCH repetition, which is earlier in time, may be selected. Similarly, when the second frequency band (second hop) has a third PUSCH repetition and a fourth PUSCH repetition, the earlier third PUSCH repetition in time may be selected. Therefore, the UCI may be multiplexed into the first PUSCH repetition and the third PUSCH repetition and transmitted. ii) The last PUSCH repetition in each frequency band (each hop) may be selected. Referring to Figure 41(b), when the first and second PUSCH repetitions are set in the first frequency band (first hop), the second PUSCH repetition, which is the last in time, may be selected. Similarly, when the third and fourth PUSCH repetitions are set in the second frequency band (second hop), the fourth PUSCH repetition, which is the last in time, may be selected. Therefore, the UCI may be multiplexed into the second and fourth PUSCH repetitions and transmitted. Compared to multiplexing the UCI into an earlier PUSCH repetition, the method of multiplexing the UCI into a later PUSCH repetition has the effect of ensuring the necessary time margin for UCI multiplexing. The PUSCH repetitions containing the UCI in the methods i) and ii) described above do not have to be consecutive in time. Therefore, the base station may have to store the UCI contained in one PUSCH repetition and wait for other PUSCH repetitions. For this reason, additional hardware for UCI storage may be required. Therefore, we will describe a method for transmitting UCI with consecutive PUSCH commands. iii) The last PUSCH iteration in time may be selected in the earlier frequency band (hop), and the first PUSCH iteration in time may be selected in the later frequency band (hop).Referring to Figure 41(b), of the first and second PUSCH repetitions set in the first frequency band (first hop), the second PUSCH repetition, which is later in time, may be selected. Similarly, in the second frequency band (second hop), the third PUSCH repetition, which is earlier in time, may be selected. Therefore, the UCI may be multiplexed into the second and third PUSCH repetitions and transmitted. That is, the UCI may be multiplexed into the second and third PUSCH repetitions, which are consecutive in time, and transmitted. iv) The base station can set the index of the PUSCH repetitions into which the UCI is multiplexed. The terminal can transmit the UCI by multiplexing it into the PUSCH repetitions determined by the index set by the base station.

[0326] DMRS signals included in a PUSCH repeatedly transmitted on the same PRB in the frequency domain may be combined and used for channel estimation (joint channel estimation). For joint channel estimation, it is necessary to reduce the number of symbols to which DMRS are mapped (density) or to repeatedly transmit DMRS-less PUSCH signals to reduce DMRS overhead, improve channel estimation accuracy, and transmit more data. The information that the base station sets on the terminal to configure the number of symbols to which DMRS are mapped in a PUSCH is as follows. In the following, repeatedly transmitted PUSCH signals sent on the same PRB can be referred to as a PUSCH bundle.

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

[0328] - Frequency hopping flag: A flag indicating whether or not PUSCH frequency hopping is performed, indicated by a 1-bit size in DCI format 0_1 ​​or 0_2 included in PDCCH.

[0329] - dmrs-AdditionPosition: Information regarding the number of symbols to which DMRS, which are added based on the number of symbols that make up PUSCH set from the upper layer, are mapped, and the symbol positions.

[0330] When PUCCH and PUSCH overlap in the time domain, the terminal multiplexes the UCI to the PUSCH that is earliest in the time domain among the overlapping PUSCHs, and does not need to transmit the PUCCH. When the UCI is multiplexed to a PUSCH, in order to ensure reliability, the HARQ-ACK may be mapped from the symbol immediately following the symbol to which the DMRS of the PUSCH is mapped. CSI-part1 and CSI-part2 may be mapped after the symbol to which the HARQ-ACK is mapped. In this case, if the HARQ-ACK is 2 bits or less, it may be punctured, and if it exceeds 2 bits, it may be rate-matched. However, when PUCCH and PUSCH bundles overlap, there may be no symbol to which the DMRS of the PUSCH is mapped, and the UCI does not need to be multiplexed. The following describes how to guarantee the reliability of the UCI and obtain PUSCH coverage gain by UCI multiplexing.

[0331] To ensure the reliability of the UCI, the terminal can multiplex the UCI only to pushes that contain symbols to which DMRS are mapped. For joint channel estimation, the pushes to which the UCI is multiplexed may be selected based on the information described below. As first information, the terminal can select an overlapping pushe to multiplex the UCI if a symbol to which DMRS is mapped exists in that pushe. In other words, adjacent pushes on the same PRB as the overlapping pushe are not considered when the UCI is multiplexed. As second information, among pushes that are consecutive in the time domain and on the same PRB in the frequency domain, the pushe that contains symbols to which DMRS are mapped may be selected and the UCI may be multiplexed. In addition to pushes that overlap with the PUCCH, the terminal can also segment and multiplex the UCI to all pushes that are repeatedly transmitted consecutively on the same PRB as the overlapping pushe and that contain symbols to which DMRS are mapped. As third information, if there is no symbol to which DMRS is mapped to a PUSCH that overlaps with a PUCCH, the terminal can multiplex and transmit the UCI to the k PUSCHs that are closest to the overlapping PUSCH. As fourth information, if there is a symbol to which DMRS is mapped to a PUSCH that overlaps with a PUCCH, the terminal can multiplex and transmit the UCI to the k PUSCHs that are closest to the overlapping PUSCH. In the third and fourth pieces of information, the adjacent PUSCHs must be PUSCHs that satisfy the conditions for UCI multiplexing described above, and the value of k may be a value set by the base station.

[0332] The terminal can select which PUSCH the UCI is multiplexed to, regardless of whether the repeatedly transmitted PUSCH contains DMRS or not. i) The UCI may be equally segmented and multiplexed to the repeatedly transmitted PUSCH. The terminal can subdivide the UCI to as uniform a size as possible and multiplex it to all PUSCHs in a PUSCH bundle that overlaps with the PUCCH. For example, the UCI may be multiplexed only to PUSCHs in a PUSCH bundle that overlaps with the PUCCH. As yet another example, the terminal can multiplex the UCI not only to PUSCH bundles that overlap with the PUCCH, but also to PUSCH bundles set at other hops in the frequency domain. Multiplexing the UCI can have an effect on coverage expansion due to frequency diversity gain in addition to joint channel estimation. ii) The UCI may be multiplexed to specific PUSCHs among the repeatedly transmitted PUSCH. UCI may be multiplexed to PUSCHs corresponding to odd or even indices within a PUSCH bundle that overlaps with a PUCCH. iii) UCI ​​may be multiplexed to a number of PUSCHs in a PUSC bundle that overlaps with a PUCCH, as set (instructed) by the base station. The base station can set (provide) information (values) regarding the offset and period for the PUSCHs to which the UCI is multiplexed to the terminal. Referring to Figure 42, the base station can set (instruct) the terminal to set the offset to 1 and the period to 2. The terminal can then multiplex and transmit the UCI on the first and fourth PUSCHs in the PUSCH bundle that overlaps with the PUCCH. The base station can also set (provide) information (values) regarding the index of the PUSCH to which the UCI is multiplexed to the terminal. Referring to Figure 43, if the base station sets the index to 2 for the terminal, the terminal can multiplex and transmit the UCI on the third PUSCH in the PUSCH bundle. iv) Among the PUSCH bundles that overlap with PUCCH, the UCI may be multiplexed to the PUSCH that is earliest in the time domain. The terminal can multiplex the UCI to the earliest PUSCH for early feedback such as HARQ-ACK.In the above-mentioned i) to iv), when inter-slot frequency hopping is set, the terminal can multiplex the UCI only to the PUSCH bundle that includes the earliest PUSCH in the time domain among the PUSCHs that overlap with the PUCCH. Alternatively, the terminal can multiplex the UCI for all frequency hops at the same symbol position as the PUSCH bundle that includes the earliest PUSCH in the time domain among the overlapping PUSCHs. In an embodiment in which the terminal multiplexes the UCI to a PUSCH that does not contain a DMRS, the terminal can multiplex the UCI to a PUSCH that does not have a DMRS symbol according to the new rules. In the above-mentioned i) to iv), a PUSCH that overlaps with a PUCCH can mean the entire repeating PUSCH that includes the PUSCH that overlaps with the PUCCH, either symbolically or slot-wise.

[0333] Figure 44 shows the cancellation of a repeatedly transmitted PUSCH based on a repeatedly transmitted PUCCH according to one embodiment of the present invention.

[0334] When a terminal encounters an overlap between a repeatedly transmitted PUCCH and a repeatedly transmitted PUSCH in one or more slots, it transmits only the PUCCH in the overlapping slot and not the PUSCH in the overlapping slot. Referring to Figure 44, a repeatedly transmitted PUCCH and a repeatedly transmitted PUSCH may overlap in the interval from slot n+2 to slot n+5. In this case, the terminal can transmit only the PUCCH and not the PUSCH in slots n+2 to n+5. When a PUSCH in an overlapping interval is not transmitted, the untransmitted PUSCH may not be deferred to the next slot, which presents a problem in that it is difficult to obtain coverage gain through repeated transmission of PUSCH. The following describes a method to solve this problem.

[0335] When a terminal has overlapping recurring PUCCH and PUSCH signals, it can multiplex the UCI contained in the PUCCH and transmit it to the PUSCH. In this case, the overlapping PUCCH does not need to be transmitted. That is, in order to ensure the coverage gain of the PUSCH, the terminal can transmit the PUSCH by multiplexing the UCI contained in the PUCCH without dropping the overlapping PUSCH. The HARQ-ACK delay may increase compared to existing methods where PUSCH signals are dropped, but since both the information to be transmitted (data and UCI) can be transmitted, it is efficient in terms of the reliability of the PUSCH and PUCCH. i) When a terminal has overlapping PUCCH and PUSCH signals, it can multiplex the UCI contained in the overlapping PUCCH and transmit it to the PUSCH. Referring to Figure 44, PUCCH and PUSCH signals overlap in the interval from slot n+2 to slot n+5. Therefore, the terminal can multiplex the UCI contained in the PUCCH in the interval of slot n+2 to slot n+5 into a PUSCH and transmit it, and does not need to transmit the PUCCH itself. The terminal can subdivide and multiplex the UCI by the number of overlapping PUSCHs (number of slots). That is, the terminal can subdivide the UCI contained in the PUCCH into four slot PUSCHs (slots n+2 to n+5) and multiplex it. On the other hand, the terminal may also multiplex the UCI into a single PUSCH without subdividing it. That is, the PUSCH into which the UCI is multiplexed may be transmitted repeatedly four times. ii) When a PUSCH and a PUCCH overlap, the terminal can multiplex the UCI of the PUCCH into a specific PUSCH. In this case, the specific PUSCH may be predetermined between the base station and the terminal, or set by the base station to the terminal. a) The specific PUSCH may be the PUSCH that is earliest in the time domain among the overlapping PUSCHs. For faster HARQ-ACK feedback, the terminal can multiplex UCI only to the earliest PUSCH in the time domain. In this case, PUSCHs that overlap with PUCCH but are not multiplexed may be transmitted as is.b) A specific PUSCH may be the PUSCH that is earliest in the time domain among the PUSCHs that overlap with the PUCCH and is transmitted on different PRBs in the frequency domain. The terminal can multiplex the UCI to the PUSCH that is earliest in the time domain and transmitted on other PRBs, in addition to for rapid HARQ-ACK feedback and for frequency diversity gain for the UCI. c) A specific PUSCH may be selected based on information set or instructed by the base station. For example, if the base station sets / instructs information for index 1, the terminal can multiplex the UCI to the PUSCH with index 1 (i.e., the second PUSCH) among the PUSCHs that overlap with the PUCCH. As yet another example, the base station can set (instruct) the terminal about the start position and length of a PUSCH. If the base station sets / instructs the terminal to start at position 0 and length 2, the terminal can multiplex the UCI from the first PUSCH (start position 0) to the second PUSCH (length 2) among the PUSCHs that overlap with the PUCCH.

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

[0337] Referring to Figure 45, the DMRS included in PUCCH repetitions #1, #2, #3, and #4 satisfy the conditions for joint channel estimation described above, so the base station can perform channel estimation by combining these DMRS. Furthermore, when PUCCH is repeatedly transmitted for frequency diversity gain, it may be transmitted by frequency hopping.

[0338] There are two types of frequency hopping: intra-slot frequency hopping and inter-slot frequency hopping.

[0339] - Intra-slot frequency hopping

[0340] The terminal can divide a PUCCH in the time domain into two parts within a slot where a PUCCH transmission is configured, and map each of the two divided PUCCHs to two hops for transmission. In this case, the PUCCH may or may not be transmitted repeatedly. If the length of the symbol to which a PUCCH is configured in one slot is the number of symbols, then the first hop may consist of floor(number of symbols / 2) symbols, and the second hop may consist of number of symbols-floor(number of symbols / 2) symbols. Referring to Figure 46, the base station can configure the terminal to repeatedly transmit a PUCCH between slots n and 4, performing intra-slot frequency hopping. In this case, the length of the symbol to which a PUCCH is assigned in one slot may be 14. The terminal may configure the first hop in each of slots n, n+1, n+2, and n+3 with the first seven symbols of PUCCH (floor(number of symbols(14) / 2)), and the second hop may consist of the seven symbols following the last symbol of the first hop (number of symbols(14)-floor(number of symbols(14) / 2)). In this case, the first hop may be transmitted in the first frequency band, and the second hop may be transmitted in the second frequency band.

[0341] - Inter-slot frequency hopping

[0342] The slot index for repetition of slots in which a PUCCH is repeatedly transmitted may be sequentially indexed based on the first slot of the first PUCCH that is repeatedly transmitted. In this case, the first slot of the first PUCCH that is repeatedly transmitted may have a slot index of 0. Referring to Figure 47, the base station can configure the terminal to repeatedly transmit PUCCHs between slots n through 4, performing inter-slot frequency hopping. In this case, the slot index for repetition of slot n is 0, and the slot indices for slots n+1, n+2, and n+3 may be 1, 2, and 3, respectively. The terminal can map the PUCCHs in the slots in which even-numbered PUCCHs are transmitted (i.e., slots with repetition slot indices 0 and 2) to the first hop. Similarly, the terminal can map the PUCCHs in the slots in which odd-numbered PUCCHs are transmitted (i.e., slot indices 1 and 3) to the second hop. In other words, the terminal can send a PUCCH in slots n and n+2 on the first hop, and a PUCCH in slots n+1 and n+3 on 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. 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 via frequency hopping, the DMRS of the PUCCH transmitted on the first hop and the DMRS of the PUCCH transmitted on the second hop are transmitted on different PRBs, making them unsuitable for joint channel estimation. Below, we will describe a frequency hopping method for improving coverage using joint channel estimation of frequency diversity canes and DMRS. For the sake of explanation, we will use PUCCH as an example, but the content described below may also be applied to PUSCH.

[0345] Frequency hopping method for joint channel estimation

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

[0347] The frequency hopping method for joint channel estimation described below is based on inter-slot frequency hopping. That is, the terminal may map even-numbered PUCCHs that are repeatedly transmitted to the first hop and transmit them, and odd-numbered PUCCHs that are repeatedly transmitted to the second hop and transmit them. In this case, the base station can configure the terminal to repeatedly transmit PUCCHs on N slots, and the specific number for setting the repeat transmission slot index can be set to M.

[0348] i) A terminal can maintain the same repeat transmission slot index for a PUCCH that is repeatedly transmitted in a specific number of slots. The repeat transmission slot index may increase sequentially for each of the specified number of slots. The specified number may be the number of PUCCHs that contain DMRS for joint channel estimation. The repeat transmission slot index for M slots may be determined to be 0 based on the slot of the first PUCCH that is repeatedly transmitted. The repeat transmission slot index for subsequent PUCCHs may increase sequentially for each of the M slots. In this case, the slot index does not need to depend on whether the PUCCH is repeatedly transmitted or not. Referring to Figure 48, the base station can set N to 4 and M to 2 in the terminal, and can set it to repeatedly transmit PUCCH starting from slot n. The terminal can determine the repeat transmission slot index for two slots starting from slot n, i.e., slots n and n+1, to be 0, and the repeat transmission slot index for two slots starting from slot n+2, i.e., slots n+2 and n+3, to be 1. PUCCH messages in slots n and n+1, where the repeat transmission slot index is 0, may be transmitted at the first hop, and PUCCH messages in slots n+2 and n+3, where the repeat transmission slot index is 1, may be transmitted at the second hop. Referring to Figure 49, the base station can set the terminal to N = 4 and M = 2, and configure it to repeatedly transmit PUCCH messages starting from slot n. Based on the M value (2), the terminal can determine that slots n and n+1 are repeat transmission slot index 0, slots n+2 and n+3 are repeat transmission slot index 1, and slots n+4 and n+5 are repeat transmission slot index 2. Slots with a repeat transmission slot index of 0 may be transmitted at the first hop, slots with a repeat transmission slot index of 1 may be transmitted at the second hop, and slots with a repeat transmission slot index of 2 may be transmitted at the first hop. However, slot n+1 is unavailable for PUCCH transmission, while slots n, n+2, n+3, and n+4 may be available for PUCCH transmission.Therefore, the terminal must repeatedly transmit PUCCH on four slots, and PUCCH can be transmitted on the four slots available for PUCCH transmission, namely slot n, slot n+2, slot n+3, and slot n+4. That is, PUCCH for slots with even repeat transmission slot indices (slots n and n+4) may be transmitted on the first hop, and PUCCH for slots with odd repeat transmission slot indices (slots n+2 and slot n+3) may be transmitted on the second hop. The terminal can set a repeat slot index for M consecutive slots together, regardless of whether they are slots capable of PUCCH transmission or not. Since these M consecutive slots are set to the same repeat slot index, they may be transmitted in the same frequency band. Therefore, if there are slots in the M consecutive slots that are not capable of PUCCH transmission, the actual number of slots on which PUCCH is transmitted may be less than M.

[0349] ii) The terminal can maintain the same repeat transmission slot index for slots that can repeatedly transmit a specific number of PUCCH signals. The terminal can then sequentially increment the repeat transmission slot index for each slot that can repeatedly transmit a specific number of PUCCH signals. The specific number may be the number of PUCCH signals including DRMS ​​used for joint channel estimation. The repeat transmission slot index for M slots may be determined to be 0 based on the slot of the first PUCCH that is repeatedly transmitted. The repeat transmission slot index for subsequent PUCCH signals may be sequentially incremented for every M slots. Referring to Figure 50, the base station can set the terminal to N = 4 and M = 2, and configure it to repeatedly transmit PUCCH signals starting from slot n. In this case, slot n+1 is a slot that cannot be used for PUCCH transmission, and slots n, n+2, n+3, and n+4 may be slots that can be used for PUCCH transmission. Based on the M value (2), the terminal can determine that the repeat transmission slot index for slots n and n+2 is 0, and the repeat transmission slot index for slots n+3 and n+4 is 1. Therefore, the terminal can send PUCCH messages for slots n and n+2, where the repeat transmission slot index is 0, at the first hop, and send PUCCH messages for slots n+3 and n+4, where the repeat transmission slot index is 1, at the second hop.

[0350] For joint channel estimation, PUCCH signals must be transmitted in the same PRB of consecutive slots. For example, referring to Figure 48, PUCCH signals set in two consecutive slots, slot n and slot n+1, are transmitted in the first hop, so the DMRS contained in the PUCCH signals set in slots n and slot n+1 can be used for joint channel estimation. Similarly, PUCCH signals set in two consecutive slots, slots n+2 and slot n+3, are transmitted in the second hop, so the DMRS contained in the PUCCH signals set in slots n+2 and slot n+3 can be used for joint channel estimation. Referring to Figure 49, PUCCH signals set in two consecutive slots, slots n+2 and slot n+3, are transmitted in the second hop, so the DMRS contained in the PUCCH signals set in slots n+2 and slot n+3 can be used for joint channel estimation. However, PUCCHs set in slots n and n+4 are transmitted at the first hop, but since slots n and n+4 are not contiguous in the time domain, the DMRS contained in PUCCHs set in slots n and n+4 are not used for joint channel estimation. Referring to Figure 50, PUCCHs set in two consecutive slots, slots n+3 and n+4, are transmitted at the second hop, so the DMRS contained in PUCCHs set in slots n+3 and n+4 can be used for joint channel estimation. However, PUCCHs set in slots n and n+2 are transmitted at the first hop, but since slots n and n+2 are not contiguous in the time domain, the DMRS contained in PUCCHs set in slots n and n+2 are not used for joint channel estimation.

[0351] For DMRS to be used in joint channel estimation, the DMRS contained in PUCCH must be transmitted in consecutive slots at the same hop.

[0352] Referring to Figure 51, the base station can set N to 4 and M to 2 for the terminal, and can configure it to repeatedly transmit PUCCH starting from slot n. In this case, slots n+1, n+2, and n+5 are slots that cannot be used for PUCCH transmission, while slots n, n+3, n+4, and n+6 may be slots that can be used for PUCCH transmission. The terminal must transmit PUCCH on four slots, and can transmit PUCCH on slots n, n+3, n+4, and n+6. Referring to Figure 51(a), the repeat transmission slot index may be set according to i) above. The repeat transmission slot index for slots n and n+1 may be set to 0, the repeat transmission slot index for slots n+2 and n+3 may be set to 1, the repeat transmission slot index for slots n+4 and n+5 may be set to 2, and the repeat transmission slot index for slot n+6 may be set to 3. Therefore, PUCCH messages set in slots n and n+4, where the repeat transmission slot index is even, may be transmitted at the first hop, while PUCCH messages set in slots n+3 and n+6, where the repeat transmission slot index is odd, may be transmitted at the second hop. Referring to Figure 51(b), the repeat transmission slot index may be set according to ii) above. The repeat transmission slot index for slots n and n+3 may be set to 0, and the repeat transmission slot index for slots n+4 and n+6 may be set to 1. Therefore, PUCCH messages set in slots n and n+3, where the repeat transmission slot index is even, may be transmitted at the first hop, while PUCCH messages set in slots n+4 and n+6, where the repeat transmission slot index is odd, may be transmitted at the second hop. According to Figures 51(a) and (b), PUCCH messages set in slots n+3 and n+4 may be transmitted at different hops.

[0353] Referring to Figure 52, the base station can set N to 8 and M to 2 for the terminal, and can configure it to repeatedly transmit PUCCH starting from slot n. Slots n+3, n+4, and n+7 are slots that cannot be used for PUCCH transmission, while slots n, n+1, n+2, n+5, n+6, n+8, n+9, and n+10 are slots that can be used for PUCCH transmission. The terminal must transmit PUCCH on 8 slots, and can transmit PUCCH on slots n, n+1, n+2, n+5, n+6, n+8, n+9, and n+10. Referring to Figure 52(a), the repeat transmission slot index may be set according to i) above. The repeat transmission slot index for slots n and n+1 may be set to 0, the repeat transmission slot index for slots n+2 and n+3 may be set to 1, the repeat transmission slot index for slots n+4 and n+5 may be set to 2, the repeat transmission slot index for slots n+6 and n+7 may be set to 3, the repeat transmission slot index for slots n+8 and n+9 may be set to 4, and the repeat transmission slot index for slot n+10 may be set to 5. Therefore, PUCCHs set in slots n, n+1, n+5, n+8, and n+9, where the repeat transmission slot index is even, may be transmitted at the first hop, and PUCCHs set in slots n+2, n+6, and n+10, where the repeat transmission slot index is odd, may be transmitted at the second hop. Referring to Figure 52(b), the repeat transmission slot index may be set according to ii) above. The repeat transmission slot index for slots n and n+1 may be set to 0, the repeat transmission slot index for slots n+2 and n+5 may be set to 1, the repeat transmission slot index for slots n+6 and n+8 may be set to 2, and the repeat transmission slot index for slots n+9 and n+10 may be set to 3.Therefore, PUCCHs set in slots n, n+1, n+6, and n+8, where the repetitive transmission slot index is even, may be transmitted at the first hop, while PUCCHs set in slots n+2, n+5, n+9, and n+10, where the repetitive transmission slot index is odd, may be transmitted at the second hop. Referring to Figure 52, PUCCHs set in consecutive slots, such as slots n+5 and n+6, may be transmitted at different hops. According to Figures 51 and 52, even PUCCHs set in consecutive slots are transmitted at different hops because their repetitive transmission slot indices are set to be different, and therefore, DMRS included in PUCCHs set in consecutive slots cannot be used for joint channel estimation. Below, we will explain how to use DRMS ​​included in PUCCHs set in consecutive slots for joint channel estimation.

[0354] iii) A terminal may set the same repetitive transmission slot index for slots capable of joint channel estimation from a specific number of slots capable of transmitting repetitive PUCCHs. Slots capable of joint channel estimation may be time-domain consecutive slots from among the slots capable of transmitting repetitive PUCCHs. The specific number may be the number of PUCCHs, including DMRS, used for joint channel estimation. A terminal may group M consecutive slots from among the slots available for PUCCH transmission and set them to the same repetitive transmission slot index. The repetitive transmission slot index for consecutive slots from among the slots available for PUCCH transmission may be incremented sequentially for every M slots. In this case, if there are fewer than M consecutive slots, the same repetitive transmission slot index may be set for the fewer than M consecutive slots. Discontinuous slots may be set to different repetitive transmission indices. The repetitive transmission slot indices of the earliest and latest slots among the discontinuous slots may be indexed sequentially. The repeat transmission slot index of the slot where the first PUCCH to be repeatedly transmitted, as set (instructed) by the base station, is set is 0. If there are M consecutive slots following the slot where 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 consecutive slots starting from the slot where 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 slot. For example, if the repeat transmission slot index of the slot before the discontinuous slot is X, the repeat transmission slot index of the first consecutive slot after the discontinuous slot may be X+1. Similarly, the repeat transmission slot index of the M consecutive slots including the first slot after the discontinuous slot may be X+1. Referring to Figure 53(a), the terminal can group consecutive slots capable of transmitting PUCCH in groups of 2 (M=2) and set the same repeat transmission slot index.Since slots n+1 and n+2 are unavailable for PUCCH transmission, there are no slots that are consecutive to slot n and used for PUCCH transmission. Therefore, only slot n may be set to repeat transmission slot index 0. The repeat transmission slot index of slot n+3, which is used for the first PUCCH transmission after slot n, may be set to 1. Since slot n+4 is consecutive to slot n+3, the repeat transmission slot indices of slots n+3 and n+4 may be set to the same value. The repeat transmission slot index of slot n+6, which is used for PUCCH transmission after slot n+4, may be set to 2 (because slot n+5 is unavailable for PUCCH transmission). Therefore, the terminal can transmit PUCCHs set in slots n and n+6, where the repeat transmission slot index is even, on the first hop, and PUCCHs set in slots n+3 and n+4, where the repeat transmission slot index is odd, on the second hop. Compared to the explanation in Figure 51, since the PUCCH set in slots n+3 and n+4 is transmitted at the same hop, the DMRS set in these PUCCHs can be used for joint channel estimation. Referring to Figure 53(b), the terminal can set the repeat transmission slot index of the first repeatedly transmitted PUCCH to 0, and the repeat transmission slot index of slot n+1, which is adjacent 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 adjacent to slot n+2 (slots n+3 and n+4 are slots that cannot be used 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 adjacent to slot n+5, may be indexed the same as that of slot n+5.

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

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

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

[0358] How to set N and M

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

[0360] ii) The terminal can map and transmit PUCCH, which is repeatedly transmitted in a number of slots that has already been set, to the same frequency hop. In this case, M may be set differently depending on the number of times PUCCH is repeatedly transmitted. In this case, M may be set as a function of N. Therefore, repeatedly transmitted PUCCH can perform flexible frequency hopping depending on the number of repetitions. 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] The following describes how a terminal can repeatedly transmit PUCCH signals using frequency hopping without requiring any separate settings for M from the base station.

[0362] iii) The terminal can perform repeated transmission of PUCCH using frequency hopping based on the number of hops. The terminal can decide how many hops to map the N PUCCHs that are repeatedly transmitted, and can determine which PUCCH is mapped to each hop. In this case, the number of hops can mean the number of PUCCHs that satisfy the conditions for joint channel estimation. Referring to Figure 54, when N is 8, there can be a total of 4 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 for the terminal, and the terminal can repeatedly transmit PUCCHs using frequency hopping based on the set number of hops. Specifically, the terminal can map the N PUCCHs to be repeatedly transmitted to K hops. For example, the terminal can map floor(N / K) PUCCHs in ascending order to the (K-1)th hop from the 1st hop, and then map ceil(N / K) PUCCHs in ascending order to the Kth hop and transmit them. Referring to Figure 58, if the number of repeated PUCCH transmissions (N) is set to 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 then map 2(ceil(8 / 4)) PUCCHs to frequency hop #4 and transmit them. In other words, 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. In 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 hops from the second to the Kth hop and transmit.

[0364] iii-b) The terminal can always map the repeatedly transmitted PUCCHs to the same number of hops and transmit them using frequency hopping, without any setting for the number of hops from the base station. Using iii-b), when both frequency hopping and joint channel estimation are applied, as many repeatedly transmitted PUCCHs as possible can be distributed and transmitted to equal frequency hops. The terminal can always divide N repeatedly transmitted PUCCHs into two hops for transmission. 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 repeated transmissions of a PUCCH (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, hop #1 may be mapped to repetition #1, repetition #2, repetition #3, and repetition #4, and hop #2 may be mapped to repetition #5, repetition #6, repetition #7, and repetition #8. In another embodiment, the terminal can map ceil(N / 2) PUCCHs in ascending order to the first hop and floor(N / 2) PUCCHs in ascending order to the second hop and transmit.

[0365] Figure 60 shows the scheduling of a physical uplink sharing channel according to one embodiment of the present invention.

[0366] A PUSCH containing a DMRS capable of joint channel estimation may be a PUSCH containing one transmit block. The transmit block size (TB size, TBS) may be determined based on one or more slots. Referring to Figure 60, the terminal can determine that two slots, slot n and slot n+1, where PUSCH#1 is set, constitute one TBS. In this case, the DMRS are contained in different slots, but may be used for joint channel estimation if the above-described conditions for joint channel estimation are met.

[0367] Figure 61 shows the scheduling of multiple physical uplink sharing channels according to one embodiment of the present invention.

[0368] a) A PUSCH containing a DMRS capable of joint channel estimation may be a repeatedly transmitted PUSCH containing one transmit block. The transmit block size is determined based on one slot, and the PUSCH may be repeatedly transmitted on multiple slots. For example, a terminal can transmit PUSCH repeat 1 in slot n and PUSCH repeat 2 in slot n+1. In this case, the DMRS is transmitted in different slots (slot n or slot n+1), but may be used for joint channel estimation if the above-described joint channel estimation conditions are met. b) On the other hand, a PUSCH may contain different transmit blocks. In this case, the PUSCHs may be scheduled or activated by different DCIs. Alternatively, a PUSCH may contain different transmit blocks scheduled or activated by one DCI. For example, referring to Figure 61, a terminal may be configured by the 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 DMRS 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] A base station can set a time domain window (or bundling window) for joint channel estimation at a terminal. The base station can configure the DMRS included in the uplink channel (PUCCH or PUSCH) transmitted within a specific time domain window to satisfy the aforementioned joint channel estimation conditions. The PUCCH or PUSCH may be transmitted repeatedly within the time domain window. In this case, the PUCCH or PUSCH may contain a single transmission block or contain different transmission blocks. The time domain window may be explicitly or implicitly set by the base station. The method for determining the time domain window is described below.

[0370] Method for determining time-domain intervals

[0371] Figure 62 shows 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 a time-domain interval to the terminal, and the terminal can determine the time-domain interval based on the transmitted information. 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 the following: the number of slots, the number of symbols, and the number of iterative transmissions of the uplink channel. The terminal can transmit PUCCH or PUSCH in a time-domain interval set by the base station to satisfy the joint channel estimation conditions. When the terminal receives information about a time-domain interval from the base station, the terminal must determine when the time-domain interval begins.

[0373] ia) The start of a time-domain interval may be the first symbol of the first slot of the first wireless frame index 0. For example, if the length of a time-domain interval is 5 slots, the time-domain interval may be determined by grouping 5 slots together starting from the first slot of the wireless frame index 0. In this case, the index of the first slot of the wireless frame index 0 may be 0.

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

[0375] ic) The start of a time-domain interval may be the first non-downlink symbol in the first non-downlink slot of radio frame index 0. A non-downlink slot may be a slot containing 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 a time-domain interval is 5 slots, the time-domain interval may be determined by grouping 5 slots together starting from the first non-downlink slot of radio frame index 0.

[0376] id) A terminal may have an offset value set to determine when a time-domain interval begins from the base station. The offset value may be at least one of the following: the number of slots, the number of symbols, or the number of repeated transmissions on the uplink channel. For example, if the offset value is X slots, X symbols, or X repetitions, a time-domain interval may be set by grouping together only the 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 set information (information about the length) of multiple time-domain intervals on a terminal. Referring to Figure 62, when a base station sets TDD settings on a terminal, it can set two patterns. In this case, the periods of each of the two patterns may be set to be different. If the period of the first pattern is P1 and the period of the second pattern is P2, then P1 + P2 may be one of the divisors of 20. Each pattern may include DL symbols, UL symbols, and flexible symbols, and may be composed in the order of DL symbols, flexible symbols, and UL symbols. Referring to Figure 62, the base station can set P1 to 2ms, P2 to 3ms, and the subcarrier interval to 30KHz. In this case, the base station can set multiple patterns that constitute the time domain on the terminal. In this case, if only one time-domain interval is set for multiple patterns, the set time-domain interval may not fit multiple patterns. Therefore, the base station can set multiple time-domain intervals on the terminal, each corresponding to one of the multiple patterns. Specifically, the base station can set two time domain intervals for the terminal: one composed of a first pattern and another composed of a second pattern. In this case, the length of the first time domain interval may be set to X1 slots, X1 symbol, and X1 repetitions, and the length of the second time domain interval may be set to X2 slots, X2 symbol, and X2 repetitions. The terminal can set time domain interval #0 based on X1 slots, X1 symbol, or X1 repetitions from the start of the time domain interval, and can set time domain interval #1 based on X2 slots, X2 symbol, or X2 repetitions. In other words, multiple time domain intervals of different lengths may be set. In this case, the values ​​of X1 and X2 may be values ​​that the base station sets for the terminal. On the other hand, the base station does not explicitly indicate which time domain interval the values ​​of X1 and X2 relate to, and the terminal may infer this. That is, X1 may correspond to period P1, and X2 may correspond to period P2.The first and second patterns can each be time-domain intervals; therefore, 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) A terminal can determine a time domain interval without receiving explicit information about the interval from the base station. That is, a terminal can implicitly determine a particular interval as a time domain interval when it does not receive explicit information about the interval from the base station.

[0379] ii-a) The terminal can implicitly determine the time-domain interval based on the number of repeated transmissions of PUCCH or PUSCH. That is, the terminal can determine the time-domain interval to be from the time when repeated transmission of PUCCH or PUSCH begins until the time when repeated transmission ends. 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) A terminal can implicitly determine time-domain intervals based on its slot configuration. That is, a terminal can determine time-domain intervals in the ampered spectrum by its slot configuration.

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

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

[0383] A resource area (e.g., a slot) where repeated transmission of an uplink channel is configured may contain one or more slots or symbols. Specifically, a resource area where a first repeatedly transmitted PUSCH / PUCCH is configured may contain one or more slots or symbols between a resource area where a second repeatedly transmitted PUSCH / PUCCH is configured. In this case, the one or more slots or symbols may be up to X slots or symbols, where X is a value configured by the base station. The one or more slots or symbols may be resources not used for uplink channel transmission. That is, a certain interval (gap) may exist between resource areas where repeatedly transmitted uplink channels are configured. In other words, a time-domain interval may be determined based on the certain interval that exists between resource areas where repeatedly transmitted uplink channels are configured.

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

[0385] Method for determining sub-time-domain intervals

[0386] i) A time-domain interval may be divided based on the length of sub-time-domain intervals. A base station can transmit length information for sub-time-domain intervals to a terminal, and the terminal can divide a 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 following: the number of slots, the number of symbols, or the number of repetitions of the uplink channel. Specifically, if the length of a time-domain interval is N (N slots / symbols / repetitions) and the length of a sub-time-domain interval is M (M slots / symbols / repetitions), the terminal can determine that the first to the Mth slot / symbol / repetition is the first sub-time-domain interval. The terminal can then determine that the M+1th to the 2Mth slot / symbol / repetition is 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 less than M. Similarly, the terminal can determine that the k*M+1th slot / symbol / repetition is the knth to the remaining (Nth) slot / repetition / symbol is the Mth sub-time-domain interval. In this case, the number of slot / symbol iterations included in the M-th sub-time domain interval may be less than M. In this case, k may be calculated as floor(N / M).

[0387] ii) Time domain intervals may be divided based on the number of subtime domain intervals. That is, a terminal receives information from a base station regarding the number of subtime domain intervals, and the terminal can divide the time domain interval according to the number of subtime domain intervals. For example, if a time domain interval is N (N slots / symbols / repetitions) and the number of subtime domain intervals is M, the number of slots / symbols / repetitions contained in one subtime domain may be ceil(N / M) or floor(N / M). Specifically, N mod M subtime domain intervals may contain ceil(N / M) slots / symbols / repetitions, and M-(N mod M) subtime domain intervals may contain floor(N / M) slots / symbols / repetitions. As yet another example, the number of slots / symbols / repetitions contained in M-1 subtime domain intervals may be floor(N / M), and the number of slots / symbols / repetitions contained in one subtime 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 a terminal determines a time domain interval based on consecutive uplink slots, it may be determined which time domain interval each uplink slot belongs to. At this time, it is also necessary to determine which time domain interval slots that are not uplink slots but are capable of uplink transmission belong to. Specifically, it is necessary to determine which time domain interval non-downlink slots belong to. Non-downlink slots 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, then slot n may be included in the time domain interval that contains slot n+1.

[0389] In an NR system, various subcarrier intervals may be set, and the symbols / slots / repetitions used to determine the (sub)time-domain intervals described above may change depending on the subcarrier interval. Therefore, it is necessary to determine the subcarrier interval for determining the (sub)time-domain interval, and in this specification, the subcarrier interval that can be referenced for determining the time-domain interval is referred to as the reference subcarrier interval.

[0390] Method for determining the reference subcarrier interval

[0391] i) The base station can set information regarding the subcarrier interval when configuring the terminal for TDD. That is, the terminal can use the subcarrier interval set together with the base station during TDD configuration as a reference subcarrier interval that can be referenced to determine the time-domain interval.

[0392] ii) When a base station configures one or more UL BWPs for a cell on a terminal, it can configure the subcarrier intervals of one or more UL BWPs. When determining a time-domain interval, the terminal can use one of the subcarrier intervals as the reference subcarrier interval. For example, if multiple subcarrier intervals are configured, the smallest subcarrier interval may become the reference subcarrier interval.

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

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

[0395] v) The base station can set the reference subcarrier interval of the cell at the terminal. In this case, the reference subcarrier interval does not have to be greater than the subcarrier interval set in UL BWP.

[0396] The following describes how a terminal independently determines a time domain interval and transmits information about the determined time domain interval to a base station.

[0397] How to determine a device's unique time domain interval

[0398] i) A terminal can transmit information to the base station regarding the start or end of a time-domain interval. For example, a terminal can inform the base station of information regarding the start or end of a time-domain interval using a 1-bit value. For example, the start time of a PUCCH or PUSCH can be indicated as "0", and intervals other than the start time can be indicated as "1". Specifically, if the resource area from which a PUCCH or PUSCH is transmitted within a time-domain interval is slot n to slot n+3, a PUCCH or PUSCH transmitted in slot n can indicate "0" with a 1-bit value, and PUCCH or PUSCH transmitted in slots n+1, n+2, and n+3 can indicate "1" with a 1-bit value. In this case, the target of the indicated value "0" or "1" may change from one another. The 1-bit value may be multiplexed to a PUSCH, and may be multiplexed to a PUSCH in the same manner as HARQ-ACK.

[0399] ii) A terminal can transmit information about time domains to the base station using toggling when a time domain is changed. For example, if a terminal transmits a single bit value of "0" for a PUSCH or PUCCH transmitted in the first time domain, the terminal can transmit a single bit value of "1" for a PUSCH or PUCCH transmitted in the second time domain.

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

[0401] If the base station fails to receive a PUSCH or PUCCH signal in a time-domain interval specified by the terminal, ambiguity may arise between the terminal and the base station regarding the time-domain interval. Referring to Figure 63(a), the terminal can transmit information about time-domain intervals to the base station using its own interpretation method i). For example, the terminal can inform the base station that slots 0 to 3 constitute one time-domain interval, and slots 4 to 5 constitute another time-domain interval. In this case, if the base station fails to receive a PUCCH or PUSCH signal in slots 3 and 4, the base station may determine that slots 0 to 5 constitute one time-domain interval and perform joint channel estimation. Referring to Figure 63(b), the terminal can transmit information about time-domain intervals to the base station using its own interpretation method ii). For example, the terminal can inform the base station that slots 0 to 2 constitute one time-domain interval, slots 3 and 4 constitute another time-domain interval, and slot 5 constitutes yet another time-domain interval. In this case, if the base station fails to receive PUCCH or PUSCH signals in slots 3 and 4, the base station may determine slots 0 to 5 as a single time-domain interval and perform joint channel estimation. However, since the PUCCH or PUSCH signals transmitted by the terminal do not satisfy the conditions for joint channel estimation, the base station may fail to estimate the channel, and therefore cannot improve coverage performance. Consequently, a method is needed to reduce ambiguity regarding the time-domain interval between the terminal and the base station.

[0402] Methods for resolving ambiguity in time domain intervals

[0403] i) A terminal can transmit a counter indicator to a base station as information about a time-domain interval. That is, a terminal can transmit information to the base station about which symbol set it is within a single time-domain interval. In this case, the symbol set may include a slot, a symbol, and repeated transmissions of uplink channels. Referring to Figure 64(a), a terminal can instruct the base station that joint channel estimation is possible using the uplink DMRS transmitted in slots 0 to 3, and that joint channel estimation is possible using the uplink DMRS transmitted in slots 4 and 5. In this case, the starting slot for joint channel estimation is indicated as 0 using a counter indicator, and subsequent slots may be indicated in ascending order by counter values ​​1, 2, ... 3. Referring to Figure 64(b), joint channel estimation is possible with the uplink DMRS transmitted in slots 0 to 2, and with the uplink DMRS transmitted in slots 3 and 4. In this case, the terminal can instruct the starting slot for joint channel estimation as 0 using a counter indicator, and subsequent slots may be indicated in ascending order by counter values. Therefore, in Figures 64(a) and 64(b), even if the base station is unable to decode the uplink transmissions of slots 3 and 4, the counter indicators show that joint channel estimation is impossible for the uplink transmissions of slots 2 and 5. This is because the counter indicator values ​​for slot 2 and slot 5 do not satisfy the ascending order requirement.

[0404] ia) The terminal can transmit information about a total indicator in addition to the counter indicator to the base station as information for joint channel estimation. In this case, the total indicator can represent the set of symbols contained in one time interval domain. The set of symbols may include slots, symbols, and repeated transmissions. Referring to Figure 65(b), the base station may fail to receive the uplink channel transmitted in slots 2 and 3. In this case, if only the counter indicator is present as information for joint channel estimation, ambiguity regarding the time domain interval may arise between the base station and the terminal. Therefore, the terminal can reduce ambiguity regarding the time domain interval by informing the base station of the total indicator in addition to the counter indicator. In Figure 65(b), (a,b) for each slot is where a is the value indicated by the counter indicator and b is the 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 constitute a single time-domain window composed of two symbol sets, the global indicator values ​​for slot 0 and slot 1 are identical.

[0405] ii) The terminal can transmit information about the time domain interval index to the base station. One time domain interval is set to the same index, and other time domain intervals are set to sequentially increasing indices, so that the terminal can inform the base station that they are different time domain intervals. Referring to Figure 66, the terminal can use the same index to inform the base station that it is transmitting an uplink channel within the same time domain interval, and use the increasing index to inform it that it is transmitting an uplink channel within another time domain interval. This has the effect that if the base station fails to receive the uplink channel transmitted in slots 3 and 4 as described in Figure 66(b), the base station can recognize this and request the terminal to retransmit the uplink channel. That is, since the indices 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 in different time domain intervals.

[0406] The following describes how to determine the time domain interval when multiple uplink cells are configured on a terminal.

[0407] Figures 67 and 68 show a method for determining the time-domain window based on the carrier integration status according to one embodiment of the present invention.

[0408] A terminal may have multiple uplink cells configured from the base station. The configuration of multiple uplink cells can be called uplink carrier aggregation. In this case, the first cell configured in the terminal is a PCell (primary cell), and any additional cells configured besides the PCell may be SCells (secondary cells). The terminal can transmit uplink channels using the configured PCell or SCell. The uplink physical channel may be at least one of PUSCH or PUCCH. When a terminal transmits uplink channels using multiple cells configured in the same frequency band, it may share transmit power. When multiple uplink cells are configured in a terminal, they may be configured to satisfy the joint channel estimation conditions described above. When uplink carrier aggregation is configured, if a single time-domain interval is configured in the terminal, there are problems in determining the time-domain interval applicable to multiple cells. In this case, the single configured time-domain interval may be a time-domain interval configured based on the PCell. When different TDD configurations are set for each cell, the time-domain interval set relative to the PCell may be an interval that does not fit for joint channel estimation for the uplink channel transmitted on the SCell. Referring to Figure 67, the terminal is configured with two uplink cells, cell#0 and cell#1, and different TDD configurations may be set for each cell. The time-domain interval is set relative to cell#0, and the time-domain interval may be set every 5 slots starting from the first slot in the frame. Although cell#1 has 6 consecutive uplink slots, the time-domain interval is set every 5 slots, so the time-domain interval set relative to cell#0 may not fit cell#1.

[0409] A base station can set different subcarrier intervals for multiple uplink cells. In this case, the subcarrier interval may be the subcarrier interval for a TDD configuration or the subcarrier interval for a BWP configuration. If, in the carrier aggregation situation, the subcarrier interval for the SCell's TDD configuration is smaller than the subcarrier interval for the PCell's TDD configuration, the time-domain configuration boundary determined based on the PCell may not be set accurately. Referring to Figure 68, the subcarrier interval 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 5 slots from the first slot in the radio frame or every 2.5 ms. In this case, the same time-domain interval may be applied to cell #1 as well. However, the boundary of the time-domain interval may be located within the third uplink slot of cell #1. Therefore, some symbols in 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. In other words, time-domain intervals may not fit if the subcarrier spacing for the SCell TDD configuration is smaller than the subcarrier spacing for the PCell TDD configuration. Therefore, time-domain intervals that are applicable to fit all uplink cells in the carrier aggregation configuration are required.

[0410] A method for determining time-domain intervals based on carrier integration status.

[0411] Figures 69 to 74 show a method for setting a time domain interval according to one embodiment of the present invention.

[0412] i) In a carrier aggregation configuration, a base station can set separate time-domain intervals for each of multiple cells. That is, when a terminal is configured with N uplink cells, including a PCell, the base station can set time-domain intervals that apply to each of the N cells. Referring to Figure 69, a terminal may be configured with cell#0 with a 30KHz subcarrier interval and cell#1 with a 15KHz subcarrier interval. Time-domain windows #0 and #1 may be set for cell#0 and cell#1, respectively. Time-domain window #0 may consist of two 1ms slots, and time-domain window #1 may consist of two 2ms slots. In this case, to reduce signaling overhead, the base station can use specific parameters that apply commonly to each cell when setting time-domain intervals for each cell.

[0413] ia) A reference subcarrier interval may be used in common for all cells. That is, the base station can set only one reference subcarrier interval for a single time-domain interval for the terminal. Alternatively, the terminal can implicitly infer a reference subcarrier interval for a single time-domain interval. In this case, the reference subcarrier interval may be applied to all cells. The terminal can determine the subcarrier interval for each cell's time-domain window. For example, the terminal can select one of the subcarrier intervals for each cell that it has determined and apply that selected subcarrier interval to the time-domain interval of all cells. In this case, the selected subcarrier interval may be the lowest subcarrier interval among the subcarrier intervals of each cell. As yet another example, the terminal can apply the subcarrier interval for the time-domain interval of a Pcell to the time-domain interval of all cells. As yet another example, the terminal can apply the subcarrier interval for the time-domain window of the cell with the lowest index to the time-domain interval of all cells. As yet another example, a terminal may have a reference subcarrier interval set by the base station that applies to the time-domain intervals of all cells. In this case, the reference subcarrier interval set on the terminal that applies to the time-domain intervals of all cells must not be greater than the subcarrier interval set in the UL BWP of all cells.

[0414] ii) The base station may have a time-domain interval length that applies to all cells in common. In this case, the length of the time-domain interval may be described as the length of the cell common time-domain interval. The length of the cell common time-domain interval may be adjusted by the reference subcarrier interval and the cell's subcarrier interval. 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 cell may be f(M*(SCS_cell / SCS_refer)) slots / symbols / repetitions. SCS_refer is the reference subcarrier interval, and SCS_cell is the subcarrier interval of the cell to which it is applied. f(x) may be at least one of ceil(x), floor(x), and round(x). Referring to Figure 70, cell#0 may be set to a subcarrier interval of 30kHz, and cell#1 to a subcarrier interval of 15kHz. In this case, the reference subcarrier interval may be set to 15KHz. 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*(30kHz / 15kHz))) slots / symbols / repetitions, and the length of the time-domain interval applied to cell#1 may be determined to be 5 (f(5*(15kHz / 15kHz))) slots / symbols / repetitions. Referring to Figure 71, for example, cell#0 may be set to a subcarrier interval of 30kHz, and cell#1 to a subcarrier interval of 15kHz. The reference subcarrier interval may be set to 30kHz. The cell common time-domain interval may be set to 5 slots. In this case, if f(x) is ceil(x), the length of the time-domain interval applied to cell#0 may be determined to be 5 (ceil(5*(30kHz / 30kHz))) slots / symbols / repetitions, and the length of the time-domain interval applied to cell#1 may be determined to be 3 (ceil(5*(15kHz / 30kHz))) slots / symbols / repetitions.

[0415] ii-a) The terminal can select one reference cell from among several uplink cells. Then, it can apply a time-domain interval determined based on the selected reference cell to the entire cell. The method for determining the reference cell is as follows:

[0416] - PCell: The reference cell may be a PCell. That is, the terminal can extend and apply a time domain interval determined based on a PCell to fit an 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, a 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 SCells other than PCell may be the reference cell.

[0418] - The lowest SCS: The reference cell may be the cell configured with the lowest subcarrier interval. This is to prevent the boundary of the time domain interval from falling within the slots of different cells, as explained with reference to Figure 68. In this case, if there are multiple cells configured with the lowest subcarrier interval, the reference cell may be selected by considering other criteria. These 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 interval, the cell with the lower 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 periodicity. The TDD configuration periodicity refers to the period in which one TDD configuration is repeated according to the 3GPP standard. Referring to Figure 72, if the subcarrier interval of all cells is 15 kHz, the TDD configuration period of cell #0 may be 5 ms, and the TDD configuration period of cell #1 may be 10 ms. The terminal can determine the cell with the longest TDD configuration periodicity as the reference cell in order to include the maximum number of uplink slots for multiple uplink cells, and apply the time-domain interval of the reference cell to the entire cell. 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 interval of cell #1 may be applied to the entire cell. If there are multiple cells with the longest TDD configuration periodicity, the reference cell may be selected by considering other criteria. Other criteria may be the cell index, subcarrier interval, and ratio of uplink slots. If there are two cells with the longest TDD configuration period, 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 containing the most uplink slots. That is, the terminal can determine the cell containing the most uplink slots at the same time interval among multiple uplink cells as the reference cell and perform uplink transmission for joint channel estimation. The same time interval may be the longest TDD configuration period among multiple cells. Referring to Figure 73, cell #1, which contains more uplink slots than cell #0, may be the reference cell. If there are multiple cells containing the most uplink slots, the reference cell may be selected by considering other criteria. Other criteria may be the cell index, subcarrier interval, or TDD configuration period. If there are two cells containing the most uplink slots, the cell with the longer TDD configuration period of both may be selected as the reference cell.

[0421] iii) The terminal can determine a time-domain interval based on consecutive slots in the union of uplink slots for multiple uplink cells. The terminal can determine a time-domain interval based on consecutive slots in the union of uplink slots between multiple cells in order to include as many TDD configurations for the configured uplink cells as possible in the time-domain interval. The union of uplink slots means slots that contain uplink symbols in at least one cell. Referring to Figure 74, two uplink cells are configured with different TDD configurations, and in this case, the subcarrier interval of the two uplink cells may be the same at 15 kHz. The terminal can determine that the union of consecutive uplink slots for cell #0 and cell #1 constitutes one time-domain interval. That is, it can determine one time-domain interval that includes the 4th and 5th slots, the 9th and 10th slots of cell #0, and the 5th to 10th slots of cell #1, and apply the determined time-domain interval to the entire cell.

[0422] Figure 75 is a flowchart showing a method for transmitting an uplink channel according to an embodiment of the present invention.

[0423] The following explanation, using Figure 75, describes how the terminal described in Figures 1 to 74 transmits an uplink channel.

[0424] The terminal can receive first information from the base station, which is information related to the TDD (Time Division Duplex) configuration (S7510). The first information includes information about the type of symbols that make up the slots, and the type of symbols may be any one of the following: downlink symbols configured to be available for downlink transmission, uplink symbols configured to be available for uplink transmission, and flexible symbols that are not configured as downlink symbols or uplink symbols. The terminal can repeatedly transmit uplink channels to the base station on resources determined ba...

Claims

1. A method for transmitting on an uplink channel in a wireless communication system, wherein the method performed by a terminal is: A step of receiving first information from a base station, which is information relating to a TDD (Time Division Duplex) configuration, wherein the first information includes information about the type of symbols constituting a slot, and the type of symbol is one of a downlink symbol configured for downlink transmission, an uplink symbol configured for uplink transmission, and a flexible symbol not configured as either a downlink symbol or an uplink symbol; A method characterized by comprising the step of repeatedly transmitting an uplink channel to the base station on a resource determined based on the first information, wherein the uplink channel is repeatedly transmitted on a first hop and a second hop, the first hop and the second hop each consist of bundles of slots used for transmitting a set number of uplink channels, the slots used for transmitting the uplink channel each consist of the uplink symbol, the first hop and the second hop each consist of slots that are consecutive in the time domain, and the first hop and the second hop each are transmitted on different Physical Resource Blocks (PRBs) by frequency hopping.

2. The method according to claim 1, characterized in that the previously set number is received from the base station.

3. The slots included in the first hop are indexed with the same index, The method according to claim 1, characterized in that the slots included in the second hop are indexed with the same index.

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

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

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

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

8. The method according to claim 1, characterized in that the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUCH).

9. The method according to claim 1, characterized in that the uplink channel is transmitted within a time-domain interval.

10. The step further includes receiving information about the time domain interval from the base station, The method according to claim 9, characterized in that the time domain interval is configured based on information relating to the time domain interval.

11. The method according to claim 10, characterized in that the information relating to the time domain interval includes one of the number of slots, the number of symbols, and the number of repeated transmissions of the uplink channel.

12. The method according to claim 9, characterized in that the time domain interval is from the time when repeated transmission of the uplink channel begins to the time when repeated transmission of the uplink channel ends.

13. The method according to claim 9, characterized in that the time domain interval is composed of consecutive slots in a time domain that includes at least one of the uplink symbol and the flexible symbol.

14. The aforementioned time domain interval includes a first time domain interval and a second time domain interval, The first time-domain interval is configured in accordance with the first pattern, The aforementioned second time-domain interval is configured in accordance with the second pattern, The first pattern and the second pattern are composed of multiple slots, The method according to claim 9, characterized in that the plurality of slot configurations constituting the first pattern and the second pattern, respectively, are different from each other.

15. The DM-RS contained in each of the multiple slots constituting the first pattern are transmitted over the same number of resources starting from the same PRB position in the same frequency domain, and are transmitted using the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming. The method according to claim 14, characterized in that the DM-RS contained in each of the plurality of slots constituting the second pattern are transmitted over resources with the same number of PRBs starting from the same PRB position in the same frequency domain, and are transmitted using the same phase, the same transmit power, the same QCL (Quasi Co Location), and the same beamforming.

16. A terminal that transmits an uplink channel in a wireless communication system, wherein the terminal is Transmitter / receiver; Includes a processor that controls the aforementioned transceiver, The aforementioned processor, The base station receives first information, which is information related to the TDD (Time Division Duplex) configuration. The first information includes information about the type of symbols that make up the slot, The type of symbol is one of the following: a downlink symbol configured for use in downlink transmission, an uplink symbol configured for use in uplink transmission, and a flexible symbol that is not configured as either a downlink symbol or an uplink symbol. The base station repeatedly transmits an uplink channel on a resource determined based on the first information. The uplink channel is repeatedly transmitted over a first hop and a second hop, and the first hop and the second hop are each configured by bundling a set number of slots used for transmitting uplink channels. The slot used for transmission on the uplink channel is configured to include the uplink symbol, The first hop and the second hop each consist of consecutive slots in the time domain. The terminal is characterized in that the first hop and the second hop are each transmitted over different PRBs (Physical Resource Blocks) by frequency hopping.

17. The terminal according to claim 16, characterized in that the previously set number is received from the base station.

18. The slots included in the first hop are indexed with the same index, The terminal according to claim 16, characterized in that the slots included in the second hop are indexed with the same index.

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

20. A method for receiving an uplink channel in a wireless communication system, which is performed by a base station, A step of transmitting first information to a terminal, which is information relating to a TDD (Time Division Duplex) configuration, wherein the first information includes information about the type of symbols constituting a slot, and the type of symbol is one of a downlink symbol configured for downlink transmission, an uplink symbol configured for uplink transmission, and a flexible symbol that is not configured as either a downlink symbol or an uplink symbol; A method comprising the step of receiving an uplink channel repeatedly transmitted from the terminal over a resource determined based on the first information, wherein the uplink channel is repeatedly transmitted over a first hop and a second hop, the first hop and the second hop each consist of bundles of slots used for transmitting an already set number of uplink channels, the slots used for transmitting the uplink channel each consist of the uplink symbol, the first hop and the second hop each consist of slots that are consecutive in the time domain, and the first hop and the second hop each are transmitted over different Physical Resource Blocks (PRBs) by frequency hopping.

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