Method and apparatus for controlling transmit power of a UE in a wireless communication system

Abstract

A method of transmitting a physical uplink shared channel (PUSCH) performed by a user equipment (UE) includes identifying whether demodulation reference signal (DMRS) time domain bundling information is included in a radio resource control (RRC) message received from a base station, determining whether at least one PUSCH is transmitted with a same transmit power within at least one transmit time domain window based on a result of the identifying, determining a transmit power for the at least one PUSCH in response to determining that the at least one PUSCH is transmitted with the same transmit power within the at least one transmit time domain window, and transmitting the at least one PUSCH with the determined transmit power.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a method of controlling power of a user equipment (UE) in a wireless communication system, and more particularly, to a method and apparatus for supporting control of uplink (UL) transmit power. BACKGROUND

[0002] To meet the increasing demand for wireless data traffic after commercialization of 4th-Generation (4G) communication systems, efforts have been made to develop 5th-Generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "beyond 4G network" communication systems or "post long term evolution (post-LTE)" systems.

[0003] To achieve high data rates, implementation of 5G communication systems in an ultra-high frequency or millimeter wave (mmWave) band (e.g., 60 gigahertz (GHz) band) is being considered. To reduce path loss of radio waves and increase a transmission distance of radio waves in the ultra-high frequency band for 5G communication systems, various techniques, such as beamforming, massive multiple-input and multiple-output (massive MIMO), full-dimension MIMO (FD-MIMO), array antennas, analog beamforming, and large scale antennas, are being studied.

[0004] To improve system networks for 5G communication systems, various techniques, such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, cooperative communication, coordinated multi-points (CoMP), and interference mitigation, have been developed. In addition, for 5G communication systems, advanced coding modulation (ACM) techniques, such as hybrid frequency-shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC), and advanced access techniques, such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA), have been developed.

[0005] The Internet has evolved from a human-based connection network, where humans create and consume information, to the Internet of Things (IoT), where distributed elements, such as objects, exchange information with each other to process the information. Internet of Everything (IoE) technology has emerged, in which the IoT technology is combined with technology for processing big data, such as a technology for connection with a cloud server. To implement the IoT, various technological elements, such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and thus, in recent years, technologies related to sensor networks for connecting objects, machine-to-machine (M2M) communication, and machine type communication (MTC) have been studied. In the IoT environment, intelligent Internet technology (IT) services can be provided to collect and analyze data obtained from connected objects, to create a new value in people's lives. The IoT can be applied to various fields such as smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart home appliances, and advanced medical services, as the existing information technology (IT) and various industries converge with each other.

[0006] Various attempts are being made to apply the 5G communication system to the IoT network. For example, the 5G communication technology, such as sensor networks, M2M communication, MTC, etc., is being implemented by using technologies including beamforming, MIMO, array antennas, etc. Application of a cloud radio access network (cloud RAN) as the above-described big data processing technology can be an example of convergence of the 5G communication technology and the IoT technology.

[0007] As various services can be provided due to the above-described technical features and the development of mobile communication systems, a method for seamlessly providing services is required. SUMMARY

[0008] Solution to the problem

[0009] An object of the disclosure is to provide a method and apparatus for performing uplink (UL) transmit power control by using a transmit power control parameter transmitted via a downlink (DL) control channel.

[0010] Additional aspects will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the presented embodiments of the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0011] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals represent like parts:

[0012] Figure 1 A diagram of a carrier aggregation (CA) system according to an embodiment of the disclosure is shown;

[0013] Figure 2 FIG. 1 shows a diagram for describing an example of transmission of downlink (DL) data and DL control information and transmission of uplink (UL) control information in a system according to an embodiment of the present disclosure;

[0014] Figure 3 FIG. 2 shows a diagram for describing timing of a user equipment (UE) applying UL transmit power control parameters obtained via downlink control information (DCI) according to an embodiment of the present disclosure;

[0015] Figure 4 FIG. 3 shows a diagram for describing an example of a UE applying UL transmit power control parameters obtained from DCI in a system according to an embodiment of the present disclosure;

[0016] Figure 5 FIG. 4 shows a diagram for describing another example of transmission of DL data and DL control information and transmission of UL control information in a CA system according to an embodiment of the present disclosure;

[0017] Figure 6 FIG. 5 shows a diagram of UE operation in a case where Figure 5 occurs;

[0018] Figure 7 FIG. 6 shows a diagram for describing an example of transmission of DL data and DL control information and transmission of UL control information in a system applying CA according to an embodiment of the present disclosure;

[0019] Figure 8 FIG. 7 shows a diagram for describing another example of transmission of DL data and DL control information and transmission of UL control information in a system applying CA according to an embodiment of the present disclosure;

[0020] Figure 9 FIG. 8 shows a diagram for describing another example of transmission of DL data and DL control information and transmission of UL control information in a system applying CA according to an embodiment of the present disclosure;

[0021] Figure 10 FIG. 9 shows a diagram for describing another example of transmission of DL data and DL control information and transmission of UL control information in a system applying CA according to an embodiment of the present disclosure;

[0022] Figure 11 FIG. 10 shows a diagram of a subframe and a slot according to an embodiment of the present disclosure;

[0023] FIGS. 12A and 12B show diagrams for describing slot-based scheduling and mini-slot-based scheduling according to an embodiment of the present disclosure;

[0024] Figure 13FIGS. 1A and 1B illustrate diagrams for describing a case in which slot-based scheduling and mini-slot-based scheduling coexist in a system to which CA is applied according to an embodiment of the disclosure;

[0025] Figure 14 FIGS. 2A and 2B illustrate diagrams for describing an example of a CA system in which slot-based scheduling and mini-slot-based scheduling coexist according to an embodiment of the disclosure;

[0026] FIG. 15A illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0027] FIG. 15B illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0028] FIG. 16A illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0029] FIG. 16B illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0030] FIG. 17A illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0031] FIG. 17B illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0032] Figure 18 FIG. 18 illustrates a diagram for describing a start time point and an end time point of accumulation of a value of δ PUCCH according to an embodiment of the disclosure;

[0033] Figure 19 FIG. 19 illustrates a procedure in which a base station (BS) controls a transmission power of a UE in a cellular system according to some embodiments of the disclosure;

[0034] Figure 20 FIG. 20 illustrates a diagram of a physical uplink shared channel (PUSCH) repetition transmission method according to an embodiment of the disclosure;

[0035] Figure 21 FIG. 21 illustrates a diagram of a PUSCH transmission method for a UE according to an embodiment of the disclosure;

[0036] Figure 22 FIG. 22 illustrates a diagram for describing a method of securing the same transmission power of a PUSCH repeatedly transmitted by a UE or a transmitter;

[0037] Figure 23 A flow diagram illustrating operations of a UE supporting demodulation reference signal (DMRS) time domain bundling is shown;

[0038] Figure 24 A flow diagram illustrating a method for determining a transmission power priority order of a UE in a multi-carrier case is shown;

[0039] Figure 25 A diagram illustrating a method for describing a UE determining a PUSCH transmission power is shown;

[0040] Figure 26 A structure of a UE according to an embodiment of the disclosure is shown; and

[0041] Figure 27 A structure of a BS according to an embodiment of the disclosure is shown.

[0042] Best mode for carrying out the invention

[0043] According to an embodiment of the disclosure, a method of transmitting a physical uplink shared channel (PUSCH) performed by a user equipment (UE) includes: identifying whether demodulation reference signal (DMRS) time domain bundling information is included in a radio resource control (RRC) message received from a base station; determining whether at least one PUSCH is transmitted with the same transmission power within at least one transmission time domain window based on a result of the identification; determining a transmission power for the at least one PUSCH in response to a determination that the at least one PUSCH is transmitted with the same transmission power within the at least one transmission time domain window; and transmitting the at least one PUSCH with the determined transmission power.

[0044] The RRC message can include information on the at least one transmission time domain window.

[0045] The information on the at least one transmission time domain window can be indicated by at least one unit of a slot or a symbol.

[0046] The at least one PUSCH can include at least one PUSCH repetition transmission configured by the base station.

[0047] Determining the transmission power for the at least one PUSCH can include: determining that at least one PUSCH belonging to a first transmission time domain window has a first transmission power; and determining that at least one PUSCH belonging to a second transmission time domain window has a second transmission power, wherein the first transmission power is different from the second transmission power.

[0048] Determining the transmit power for the at least one PUSCH can include assigning the at least one PUSCH a transmit power in preference to at least one of: a single PUSCH or physical uplink control channel (PUCCH) transmission; a PUSCH or PUCCH repetition transmission that is not DMRS time bundling; a PUSCH or PUCCH transmission including channel state information (CSI) information; a PUCCH transmission including hybrid automatic repeat request (HARQ)-ACK, scheduling request (SR), or link recovery request (LRR) information; a PUSCH transmission including HARQ-ACK information; a PUSCH transmission without HARQ-ACK or CSI; a PUSCH transmission for a type 2 random access procedure; a PUSCH transmission from a Pcell; a sounding reference signal (SRS) transmission; or a physical random access channel (PRACH) transmission from another serving cell than the Pcell.

[0049] The method can further include transmitting, to the base station, UE capability information about whether DMRS time bundling is supported.

[0050] According to an embodiment of the disclosure, a user equipment (UE) for transmitting a physical uplink shared channel (PUSCH) includes a memory; a transceiver; and at least one processor coupled with the memory and the transceiver and configured to: identify whether demodulation reference signal (DMRS) time bundling information is included in a radio resource control (RRC) message received from a base station; determine whether at least one PUSCH is transmitted with a same transmit power within at least one transmit time domain window based on a result of the identifying; determine a transmit power for the at least one PUSCH; and transmit the at least one PUSCH with the determined transmit power.

[0051] The RRC message can include information about the at least one transmit time domain window.

[0052] The information about the at least one transmit time domain window can be indicated by at least one unit of a slot or a symbol.

[0053] The at least one PUSCH can include at least one PUSCH repetition transmission configured by the base station.

[0054] The at least one processor can be further configured to determine that at least one PUSCH belonging to a first transmit time domain window has a first transmit power and determine that at least one PUSCH belonging to a second transmit time domain window has a second transmit power, wherein the first transmit power is different from the second transmit power.

[0055] The at least one processor can be further configured to prioritize the allocation of transmit power for the at least one PUSCH over at least one of: a single PUSCH or physical uplink control channel (PUCCH) transmission; a PUSCH or PUCCH repetition transmission that is not DMRS time domain bundled; a PUSCH or PUCCH transmission including channel state information (CSI) information; a PUCCH transmission including hybrid automatic repeat request (HARQ)-ACK, scheduling request (SR), or link recovery request (LRR) information; a PUSCH transmission including HARQ-ACK information; a PUSCH transmission without HARQ-ACK or CSI; a PUSCH transmission for a type 2 random access procedure; a PUSCH transmission from a Pcell; a sounding reference signal (SRS) transmission; or a physical random access channel (PRACH) transmission from another serving cell than the Pcell.

[0056] The at least one processor can be further configured to transmit, to the base station, UE capability information about whether to support the DMRS time domain bundling.

[0057] According to an embodiment of the disclosure, a method of receiving a physical uplink shared channel (PUSCH) performed by a base station includes transmitting, to a user equipment (UE), a radio resource control (RRC) message including demodulation reference signal (DMRS) time domain bundling information; receiving at least one PUSCH transmitted by the UE with a transmit power determined based on the RRC message; and estimating a channel by bundling DMRSs of the at least one PUSCH.

[0058] The RRC message can include information about at least one transmission time domain window.

[0059] The information about the at least one transmission time domain window can be indicated by at least one unit of a slot or a symbol.

[0060] The at least one PUSCH can include at least one PUSCH repetition transmission configured by the base station.

[0061] The receiving the at least one PUSCH transmitted by the UE with the transmit power determined based on the RRC message can include receiving, from the UE, at least one PUSCH belonging to a first transmission time domain window with a first transmit power; and receiving, from the UE, at least one PUSCH belonging to a second transmission time domain window with a second transmit power, wherein the first transmit power is different from the second transmit power.

[0062] The method can further include receiving, from the UE, UE capability information about whether to support the DMRS time domain bundling. DETAILED DESCRIPTION

[0063] Before undertaking the detailed description below, it can be advantageous to set forth definitions of certain terms and phrases used throughout this patent document: the terms "include" and "comprise," as well as derivatives thereof, mean "including, but not limited to"; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated therewith," as well as derivatives thereof, can mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, be proximate to, be bound to or with, have a property of, have, have a property or be proper gy of, or the like; and the term "controller" means any device, system or part thereof that controls at least one operation, whether local or remote. It will be appreciated that functions associated with any particular controller can be centralized or distributed, whether locally or remotely.

[0064] Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation on a suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A "non-transitory" computer readable medium excludes wired, wireless, optical, or other communication links. Non-transitory computer readable media include media where data is permanently stored and media where data is stored and later overwritten, such as a rewritable optical disc or an erasable memory device.

[0065] Definitions for certain words and phrases are provided throughout this patent document, and include the definitions below. To the extent a term or phrase is not explicitly defined, it should be given its broadest context interpretation consistent with the disclosure.

[0066] The detailed description discussed Figures 1 to 27 The various embodiments described herein are presented only by way of example and are not intended as limitations on the concepts and principles of this disclosure. As such, the disclosure is intended to cover any and all modifications and variations of the various embodiments comprising aspects of the concepts and principles thereof disclosed herein.

[0067] Throughout the disclosure, the expression "at least one of a, b, or c" indicates only a; only b; only c, both a and b; both a and c; both b and c; all of a, b, and c, or variations thereof.

[0068] Examples of the terminal can include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, a multimedia system capable of performing a communication function, etc.

[0069] In the disclosure, the controller can also be referred to as a processor.

[0070] Throughout the specification, the layer (or layer device) can also be referred to as an entity.

[0071] Hereinafter, the operational principle of the disclosure will be described in detail with reference to the accompanying drawings. In the following description of the disclosure, well-known functions or configurations are not described in detail because they will obscure the disclosure with unnecessary detail. The terms used in the specification are defined in consideration of the functions used in the disclosure, and can be changed according to the intention of the user or the operator or the usual method. Therefore, the definition of the term is understood based on the entire description of the specification.

[0072] It will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. The computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. The computer program instructions can also be stored in a computer- executable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer- executable or computer-readable memory implement an article of manufacture including an instruction means which implement the function specified in the flowchart block or blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block or blocks.

[0073] In addition, each block of the flowchart illustrations can represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the flowchart. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks can sometimes be executed in the reverse order, depending upon the functionality involved.

[0074] The term “~unit” as used in the present embodiment refers to a software or hardware component such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC) that performs certain tasks. However, the term “~unit” does not limit the software or hardware to a certain style of programming or design. The “~unit” can be configured as software or can be configured to operate one or more processors. For example, a “~unit” can include components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality provided for in the components and “~units” can be combined into fewer components and “~units” or further separated into additional components and “~units”. In addition, the components and “~units” can be implemented to operate one or more central processing units (CPUs) in a device or a secure multimedia card. Also, in the embodiments of the disclosure, the “~unit” can include one or more processors.

[0075] In the disclosure, a downlink (DL) refers to a wireless transmission path of a signal to be transmitted from a base station (BS) to a UE, and an uplink (UL) refers to a wireless transmission path of a signal to be transmitted from a UE to a BS. Although the following description can be provided with respect to a long term evolution (LTE) or LTE-Advanced (LTE-A) system as an example, the embodiments of the disclosure are also applicable to other communication systems having a similar technical background or channel structure. For example, the embodiments of the disclosure can be applicable to a system including a 5th generation (5G) new radio (NR) communication technology developed after the LTE-A system, and hereinafter, 5G can indicate a concept including LTE, LTE-A, and other similar services according to related technologies. The disclosure is applicable to other communication systems by modification without departing from the scope of the disclosure under the judgment of those skilled in the art.

[0076] Hereinafter, in order to facilitate description, terms indicating an access node, terms indicating a network entity, terms indicating a message, terms indicating an interface between network entities, and terms indicating pieces of identification information used in the following description are exemplified. Accordingly, the disclosure is not limited to the terms to be described hereinafter, and other terms indicating objects having equal technical meanings can be used.

[0077] For convenience of description, the disclosure uses terms and names defined in the 3rd generation partnership project (3GPP) long term evolution (LTE) standard. However, the disclosure is not limited to the terms and names, and can be equally applicable to a communication system conforming to other standards.

[0078] In the description of the disclosure, when it is considered that well-known functions or configurations will unnecessarily obscure the essence of the disclosure, they are not described in detail. Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings.

[0079] According to embodiments of the disclosure, a carrier aggregation (CA) technique capable of increasing a data rate by grouping at least two frequency bands is well known. A UE in a system supporting CA can transmit or receive DL / UL data and control information via two or more carrier frequencies configured for DL or UL. Multiple pieces of information can be included in a physical uplink shared channel (PUSCH), a physical downlink control channel (PUCCH), or a sounding reference signal (SRS) and transmitted via UL.

[0080] According to embodiments of the disclosure, when a UE performs transmission via the UE (transmission via PUSCH, PUCCH, or SRS), the UE can perform transmission power control to reduce interference to a neighboring cell and increase reception reliability of information to be transmitted via UL. For UL transmission power control, the UE can configure a transmission power value by using parameters received from BS and DL path attenuation values measured by the UE. In this regard, some of the parameters transmitted from the BS can be received by the UE via radio resource control (RRC) signaling, and some parameters can be received by the UE via downlink control information (DCI) of a DL control channel. In addition, the transmission power control parameters received by the UE from the DCI of the DL control channel can be transmitted from the BS by using UE-specific DCI transmitted only to a specific UE, or can be transmitted from the BS by using group-common DCI transmitted only to a specific group of UEs.

[0081] According to embodiments of the disclosure, the number of UL carrier frequencies can be a subset of the number of DL carrier frequencies. For example, when it is assumed that the number of DL carrier frequencies is N and the number of UL carrier frequencies is M, N ≥ M. Here, a carrier used in CA can be referred to as a cell.

[0082] According to embodiments of the disclosure, in a CA environment, a UE can receive one or more DCIs from one or more cells. For example, in a CA environment of three cells, the UE can receive three DCIs from the cells. In this regard, the three DCIs can be configured as one of UE-specific DCI and group-common DCI (for example, the three DCIs can be configured as three UE-specific DCIs or three group-common DCIs), or can be configured as a combination of UE-specific DCI and group-common DCI (for example, the three DCIs can be configured as a combination of one UE-specific DCI and two group-common DCIs).

[0083] According to an embodiment of the disclosure, the UL transmission power control method using the parameters received via the DCI can include an accumulation method and a method using absolute values. The accumulation method can be a method of accumulating and using the transmission power control parameter values received by the UE via the DCI. The method using absolute values can be a method in which the UE uses the received transmission power control parameter values without accumulation. According to an embodiment of the disclosure, the BS can configure which of the two transmission power control methods to use via RRC signaling.

[0084] According to an embodiment of the disclosure, when the accumulation method is used, the UE can determine which of the two or more DCIs received by the UE to use to perform accumulation.

[0085] Figure 1 A diagram of a CA system according to an embodiment of the disclosure is illustrated.

[0086] Figure 1 An example in which the number of UL carrier frequencies is equal to the number of DL carrier frequencies is illustrated, but the disclosure is not limited thereto.

[0087] According to an embodiment of the disclosure, the UE can transmit / receive data and control information from some cells of a BS consisting of N cells via DL / UL (with reference to FIG. 1). Figure 1 In this regard, Cell-1 and Cell-2 can transmit DL control information for DL data transmission to the UE. In addition, Cell-1 and Cell-2 can transmit UL control information for UL data transmission to the UE.

[0088] The transmission power control with respect to the PUCCH in the conventional wireless communication system is as follows in [Equation 1] below.

[0089] [Equation 1]

[0090]

[0091] In [Equation 1], P PUCCH (i) indicates the transmission power of the PUCCH in the i-th subframe of the UE, and each parameter in [Equation 1] is as follows.

[0092] P 0_PUCCH : is composed of P 0_NOMINAL_PUCCH + P 0_UE_PUCCH and is a parameter that is a value configured for the UE by the BS via RRC signaling. In particular, P 0_NOMINAL_PUCC H is a cell-specific value composed of 8-bit information and having a range of [-126, 24] dB. In addition, P 0_UE_PUCCHUE-specific value consisting of 4 bits of information and having a range of [-8, 7] dB. The cell-specific value is transmitted from the BS to the UE via a system information block (SIB), and the UE-specific value is transmitted from the BS to the UE via dedicated RRC signaling.

[0093] PL c : Path loss value calculated by the UE. The UE calculates the path loss value from the received power of a cell-specific reference signal (CRS) of a DL channel transmitted by the BS. In more detail, the BS transmits referenceSignalPower and a filter coefficient to the UE via UE-specific cell-specific RRC signaling, and based on this, the UE calculates the path loss value as follows. PL c = referenceSignalPower - higher layer filtered RSRP.

[0094] Δ F_PUCCH (F): Value transmitted to the UE via higher layer signaling (cell-specific signaling or UE-specific RRC signaling), which varies according to the format of the PUCCH and has a relative value with respect to PUCCH format la (1-bit HARQ-ACK / NACK transmission). Δ F_PUCCH The value of (F) is configured as shown in [Table 1].

[0095] [Table 1] Δ F-PUCCH (F) value

[0096] PUCCH format parameters, delta F_PUCCH (F)] Value [dB] 1 deltaF-PUCCH-Format1 [-2，0，2] 1b deltaF-PUCCH-Format1b [1，3，5] 2 deltaF-PUCCH-Format2 [-2，0，1，2] 2a deltaF-PUCCH-Format2a [-2，0，2] 2b deltaF-PUCCH-Format2b [-2，0，2]

[0097] Δ TxD (F') is a value transmitted to the UE via higher layer signaling (cell-specific signaling or UE-specific RRC signaling) when the PUCCH is transmitted via 2 antenna ports (i.e., space frequency block coding (SFBC)), and the value varies according to the format of the PUCCH. When SFBC is not used, Δ TxD (F') = 0. Δ TxD The value of (F') is configured as shown in [Table 2].

[0098] [Table 2] Δ TxD (F') value

[0099]

[0100] h(n CQI , n HARQ , n SR ): Different values are used according to the format of the PUCCH, and in this regard, n CQI indicates the number of bits used in the feedback of channel quality information (CQI), n HARQindicates the number of bits used in hybrid automatic repeat request (HARQ)-ACK / NACK feedback, and n SR is 0 or 1 used in feedback of a scheduling request.h(n CQI , n HARQ , n SR may have different values according to a format of a PUCCH.

[0101] g(i) is a parameter for performing closed loop power control. A BS can correct PUCCH transmission power per UE. Unlike PUSCH transmission power control, in which only accumulation-based transmission power control is performed, and g(i) is given as shown in [Equation 2], is given.

[0102] [Equation 2]

[0103]

[0104] That is, g(i) in the i-th subframe can be calculated by accumulating a value of g(i-1) that has been transmitted to the UE in DCI via a physical downlink control channel (PDCCH) in the i-k_m-th subframe to a value of δ PUCCH used in the previous subframe (i.e., the i-1-th subframe). The value of δ PUCCH may vary according to a DCI format. For DCI formats 1A / 1B / 1D / 1 / 2A / 2B / 2C / 2 / 3, the same value as accumulation δ PUSCH of [Table 3] can be used. In the case of DCI format 3A, the value of δ PUCCH may be equal to the value of δ PUSCH used in [Table 4].

[0105] [Table 3] Mapping of TPC command to accumulation δ PUSCH value in DCI format 0 / 3 / 4.

[0106]

[0107] [Table 4] Mapping of TPC command to accumulation δ PUSCH value in DCI format 3A.

[0108]

[0109] In [Equation 2], the value of M and the value of k0 can be used differently in a frequency division duplex (FDD) system and a time division duplex (TDD) system. In more detail, in the FDD system, M=1, k0=4, and in the TDD system, M, k0 can have different values according to a DL / UL configuration as shown in [Table 5].

[0110] [Table 5] k0, k1,.., kN-1 for TDD M-1}

[0111]

[0112] Figure 2 A diagram illustrating an example for describing transmission of DL data and DL control information and transmission of UL control information in a CA system according to an embodiment of the present disclosure is shown.

[0113] According to an embodiment of the present disclosure, a component carrier-1 (CC-1) can be referred to as a primary cell (PCell).

[0114] CC-2 to CC-N can be referred to as secondary cells (SCells). Here, the CC-1 can transmit DL data and control information which are PDCCH-1 and PDSCH-1, respectively, to the UE.

[0115] The CC-2 can also transmit DL data and control information which are PDCCH-2 and PDSCH-2, respectively, to the UE.

[0116] The PDCCH-1 transmitted via the PCell (CC-1) can include resource allocation information of the PDSCH-1 transmitted via the PCell, and 2 bits of a value of δ PUCCH which is a transmission power control parameter value of the PUCCH transmitted via the PCell of [Table 3]. The PDCCH-2 transmitted via the SCell (CC-2) can include resource allocation information of the PDSCH-2 transmitted via the CC-2 and resource allocation information of the PUCCH transmitted via the PCell. Here, the resource allocation information of the PUCCH can reuse a transmission power control (TPC) command field. That is, the PUCCH transmitted via the Scell does not have a specific field for separate PUCCH resource allocation information, and the UE can reinterpret the 2 bits of the TPC command field of the indication of the value of δ PUCCH to the PUCCH resource allocation information.

[0117] Although in Figure 2Although not shown, embodiments of this disclosure can be applied to cases where cells transmit PDCCH. Therefore, embodiments of this disclosure can be applied regardless of the number of cells. In cases where CC-2 and CC-3 transmit PDCCH-2 and PDSCH-2, and PDCCH-3 and PDSCH-3 respectively, the TPC commands for PDCCH-2 and PDCCH-3 can include resource allocation information for PUCCH transmitted via PCell. The TPC command fields for PDCCH-2 and PDCCH-3 can have the same value, and the UE can reinterpret the TPC command fields for PDCCH-2 and PDCCH-3 as resource allocation information for PUCCH transmitted via PCell.

[0118] Figure 3 A diagram is shown illustrating the timing of UL transmit power control parameters obtained via DCI for a UE application according to an embodiment of the present disclosure.

[0119] In an FDD system, HARQACK / NACK information regarding the Physical Downlink Shared Channel (PDSCH), received via DL in the (n-4)th subframe, is transmitted via the PUCCH of the nth subframe. Therefore, the δ obtained by the UE from the TPC command field of the UE-specific DCI received in the (n-4)th subframe... PUCCH The value (or δ obtained by the UE from the group shared DCI) PUCCH The value of ) is used to transmit the PUCCH of the nth subframe.

[0120] In a TDD system, the rules in [Table 5] can be applied. More specifically, in systems following TDD DL / UL configuration #0, the DL and UL configurations can be as follows: Figure 3 As in the example. Here, D indicates the DL subframe (DL), U indicates the UL subframe (UL), and S indicates the special subframe in which DL, UL, and gaps coexist.

[0121] Referring to [Table 5], the δ to be applied to subframe-2 PUCCH The value (δ obtained by the UE from the TPC command field of the UE-specific DCI) PUCCH The value or δ obtained by the UE from the group shared DCI PUCCH The value corresponds to δ emitted in the previous sixth subframe before subframe-2. PUCCH The value of δ. That is, the value to be applied to subframe-2. PUCCH The value can correspond to δ transmitted in subframe number 6. PUCCH The value of .

[0122] δ to be applied to subframe-4 PUCCH The value can correspond to δ emitted in the previous fourth subframe before subframe number -4. PUCCHvalue. That is, δ PUCCH the value of δ PUCCH may correspond to the δ

[0123] the value of δ PUCCH may correspond to the δ PUCCH value transmitted in the previous sixth subframe before the subframe number -7. That is, δ PUCCH the value of δ PUCCH may correspond to the δ

[0124] Finally, δ PUCCH the value of δ PUCCH may correspond to the δ PUCCH value transmitted in the previous fourth subframe before the subframe number -9. That is, δ PUCCH the value of δ

[0125] Figure 4 FIG. 1 shows a diagram for describing an example of applying UL transmission power control parameters obtained by a UE from DCI according to an embodiment of the disclosure.

[0126] In operation 400, the UE receives one or more UE-specific DCIs or group common DCIs from one or more cells. Here, the UE-specific DCI indicates a DCI format in which a cyclic redundancy check (CRC) of the DCI is scrambled by a cell radio network temporary identifier (C-RNTI) or a semi-persistent scheduling (SPS)-RNTI, and more specifically, can indicate a DCI format 1, 1A, 2, 2A, 2B, or 2C or a DCI format 0_0, 0_1, 1_0, or 1_1.

[0127] The group common DCI indicates a DCI format in which a CRC of the DCI is scrambled by a TPC-PUCCH-RNTI (or TPC-PUSCH-RNTI, TPC-SRS-RNTI), and more specifically, can indicate a DCI format 3 or 3A or a DCI format 2_2 or 2_3.

[0128] The UE can receive one or more DCIs, for example, two or more UE-specific DCIs, two or more group common DCIs, or two or more UE-specific DCIs and group common DCIs, from one or more cells in a specific subframe (for example, an nth subframe).

[0129] In operation 410, after receiving the DCI, the UE can determine whether the DCI is received from the PCell, and when there is the DCI received from the PCell, the UE can obtain δPUCCH The value of δ. In other words, the UE can obtain δ from the TPC command field of the UE-specific DCI or the group-shared DCI. PUCCH The value of .

[0130] In operation 420, the UE can obtain the resource information of the PUCCH to be transmitted to the PCell from the TPC command field of the UE-specific DCI (or group-shared DCI) received from the SCell. When the UE receives two or more UE-specific DCIs from two or more SCells, the UE may not expect different UE-specific DCIs to indicate two or more segments of different PUCCH resource information. That is, the BS can transmit two or more segments of the same PUCCH resource information via different UE-specific DCIs. In another embodiment of this disclosure, operation 420 can be performed after operation 430.

[0131] The UE obtains δ from the DCI of PCell and SCell respectively. PUCCH After obtaining the PUCCH transmit power value and the PUCCH resource information used for PUCCH transmission, the UE can configure the transmit power value of the PUCCH to be transmitted to the PCell.

[0132] In operation 430, the UE can use the obtained δ PUCCH To update the value of g(i). More specifically, the UE can use [Equation 2] to obtain δ PUCCH Update the value of g(i).

[0133] In operation 440, the UE can determine the PUCCH transmit power based on the updated value of g(i) and the obtained PUCCH resource information. More specifically, the UE can configure P using [Equation 1]. PUCCH The value of (i).

[0134] In operation 450, the UE can transmit the PUCCH based on the determined PUCCH transmit power. More specifically, in operation 440, the UE can transmit the PUCCH by using the configured P... PUCCH (i) Transmit PUCCH in the i-th subframe.

[0135] Figure 5 A diagram is shown illustrating another example of the transmission of DL data and DL control information, as well as the transmission of UL control information, in a CA system according to embodiments of the present disclosure.

[0136] and Figure 2 The difference lies in Figure 5In this case, CC-1 can not transmit DL data and control information to the UE, and CC-2 and CC-N can transmit PDCCH-2 and PDSCH-2 and PDCCH-N and PDSCH-N to the UE, respectively.

[0137] According to Figures 2 to 4 the description, the UE can obtain information about the value of δ PUCCH via a 2-bit TPC command field of PDCCH-1 transmitted from the PCell (CC-1), and can obtain resource allocation information of a PUCCH to be transmitted to the PCell via a 2-bit TPC command field of PDCCH transmitted from the SCell. Here, when two or more SCells transmit PDCCH, the 2-bit TPC command fields of PDCCH of the respective SCells can have the same value.

[0138] Referring to Figure 5 , because PDCCH-1 and PDSCH-1 are not transmitted from the PCell, the UE can not obtain the value of δ PUCCH from DCI of PDCCH-1 that the UE can refer to in order to transmit a PUCCH. The specific operations thereafter will now be described in detail with reference to Figure 6 .

[0139] Figure 6 A diagram illustrating an example for describing an operation of a UE according to Figure 5 of the present disclosure according to an embodiment of the present disclosure is shown.

[0140] In operation 600, the UE can receive one or more DCIs from one or more cells in an (n-k)th subframe. In an embodiment of the present disclosure, the UE can transmit a PUCCH to a PCell in an nth subframe. Here, in the case of an FDD system, the value of k is fixed to 4, and in the case of a TDD system, the value of k follows [Table 2] according to a configuration of DL and UL (i.e., according to a TDD DL / UL configuration).

[0141] In operation 610, the UE can determine whether there is DCI received from the PCell in the (n-k)th subframe. In an embodiment of the present disclosure, after the UE determines whether there is UE-specific DCI received from the PCell, the UE can determine whether there is group-common DCI received from the PCell.

[0142] In operation 620, when there is DCI received from the PCell, the UE can obtain the value of δ PUCCH from the DCI received from the PCell. In more detail, the UE can obtain the value of δ PUCCHvalue. In another embodiment of the disclosure, when there is no group common DCI received from the PCell in the (n-k)th subframe, the UE can configure the value of δ PUCCH to 0 dB.

[0143] In operation 630, when there is no DCI received from the PCell, the UE can configure the value of δ PUCCH to 0 dB. In an embodiment of the disclosure, when there is no group common DCI received from the PCell in the (n-k)th subframe, the UE can configure the value of δ PUCCH to 0 dB.

[0144] In operation 640, the UE can obtain resource information of the PUCCH to be transmitted to the PCell from a TPC command field of the DCI received from the SCell. In an embodiment of the disclosure, the UE can obtain resource information of the PUCCH to be transmitted to the PCell from a TPC command field of the UE-specific DCI received from the SCell. When the UE receives two or more UE-specific DCIs from two or more SCells, the UE can not expect two or more pieces of different PUCCH resource information indicated by different UE-specific DCIs. That is, the BS can transmit two or more pieces of the same PUCCH resource information via different UE-specific DCIs. In another embodiment of the disclosure, operation 640 can be performed after operation 650.

[0145] In operation 650, the UE can update the value of g(i) with the obtained δ PUCCH . In more detail, the UE can update the value of g(i) (where i = n) with the obtained δ PUCCH by using [Equation 2].

[0146] In operation 660, the UE can determine the transmission power of the PUCCH based on the updated value of g(i) and the obtained resource information of the PUCCH. In more detail, the UE can configure the value of P PUCCH (n) by using [Equation 1].

[0147] In operation 670, the UE can transmit the PUCCH based on the determined transmission power of the PUCCH. In more detail, the UE can transmit the PUCCH in the nth subframe with P PUCCH (n) configured in operation 660.

[0148] Figure 7 A diagram for describing transmission of DL data and DL control information and transmission of UL control information in a system to which CA is applied according to an embodiment of the disclosure is illustrated.

[0149] As described with reference toFigures 2 to 6 As described, depending on whether the 2-bit TPC command field is transmitted from the DCI of the PCell or the DCI of the SCell, the UE interpretation of the TPC command field can vary. That is, the UE can obtain the value of from the TPC command field of the DCI transmitted from the PCell, and can obtain the PUCCH from the TPC command field of the DCI transmitted from the SCell. This operation does not require an additional bit for indicating the resource allocation information of the PUCCH, so that the overhead of the DCI bit number can be reduced. PUCCH PUCCH As described, depending on whether the 2-bit TPC command field is transmitted from the DCI of the PCell or the DCI of the SCell, the UE interpretation of the TPC command field can vary. That is, the UE can obtain the value of from the TPC command field of the DCI transmitted from the PCell, and can obtain the PUCCH from the TPC command field of the DCI transmitted from the SCell. This operation does not require an additional bit for indicating the resource allocation information of the PUCCH, so that the overhead of the DCI bit number can be reduced.

[0150] In the communication system according to the embodiment of the present disclosure, the DCI bit number can need to be increased. Accordingly, in the communication system according to the embodiment of the present disclosure, the DCI bit for indicating the value of to the UE for the transmit power control of the PUCCH and the DCI bit for indicating the resource allocation information of the PUCCH to the UE can exist separately. In this case, the UE can receive two or more DCIs from two or more cells, and it is required to define the operation that the UE must perform at that time. For example, it is required to define whether the UE follows the TPC command field of the UE-specific DCI of the PCell or from all two or more TPC command fields transmitted from the PCell and the SCell.

[0151] In operation 700, the UE can receive one or more DCIs from one or more cells in the (n-k)th subframe. Then, the UE can transmit the PUCCH to the PCell in the nth subframe. In the communication system according to the embodiment of the present disclosure, in order to support services having various delays, the BS can flexibly configure the value of k. Here, k can indicate a time difference between the time of receiving the DCI and the time of transmitting the PUCCH. In more detail, depending on the configuration of the DL and the UL, the value of k in the FDD system can be 4, and the value of k in the TDD system can correspond to the values defined in [Table 2]. That is, a fixed value of k can be used.

[0152] According to the embodiment of the present disclosure, the ratio and the pattern of the DL and the UL configuring a frame or a slot can vary and can be dynamically changed. Accordingly, the BS can configure or indicate the value of k for the UE. For example, the BS can inform the UE of k value candidates consisting of two or more values of k via RRC signaling, and can indicate one value of k from the k value candidates to the UE via DCI. Here, the BS can configure the value of k by sufficiently considering the processing time capability of the UE. In more detail, in the process of negotiating the capability with each UE, the BS can obtain information on the processing time capability of each UE. For example, UE-A can provide a fast processing time, and thus can use a smaller value of k, but UE-B cannot provide a fast processing time, and thus can have to use a larger value of k.​

[0153] In operation 710, the UE can determine whether there is the DCI received from the PCell in the (n-k)th subframe by using the value of k. In an embodiment of the present disclosure, the UE can determine whether there is the UE-specific DCI or the group common DCI.

[0154] In operation 720, when there is the DCI received from the PCell, the UE can obtain the value of δ PUCCH from a TPC command field of the DCI.

[0155] In operation 730, when there is no DCI received from the PCell, the UE can determine whether there is the DCI received from the SCell.

[0156] In operation 740, when there is the DCI received from the SCell, the UE can obtain the value of δ PUCCH from a TPC command field of the DCI. When the UE receives two or more DCIs from two or more SCells, the UE can obtain the value of δ PUCCH from a TPC command field of the UE-specific DCI received from the SCell having the lowest cell index.

[0157] In operation 750, when there is no UE-specific DCI received from the PCell and the SCell, the UE can configure the value of δ PUCCH to 0 dB.

[0158] In operation 760, the UE can obtain resource information of the PUCCH from the DCI transmitted from one of the PCell or the SCell. The BS can transmit the resource information of the PUCCH via the DCI of the PCell and one or more SCells. Here, the BS can configure the resource information of the PUCCH transmitted via the DCI to be the same in all cells, and can transmit the resource information of the PUCCH to the UE. In another embodiment of the present disclosure, operation 760 can be performed after operation 760.

[0159] In operation 770, the UE can update the value of g(i) with the obtained δ PUCCH . In more detail, the UE can update the value of g(i) (where i = n) with the obtained δ PUCCH by using [Equation 2].

[0160] In operation 780, the UE can determine the transmission power of the PUCCH based on the updated value of g(i) and the obtained resource information of the PUCCH. In more detail, the UE can configure the value of P PUCCH (n) by using [Equation 1].

[0161] In operation 790, the UE can transmit the PUCCH based on the determined transmit power of the PUCCH. In more detail, the UE can transmit the PUCCH by using the PUCCH format configured in operation 780. PUCCH (n) transmit the PUCCH in the nth subframe.

[0162] Figure 8 A diagram for describing transmission of DL data and DL control information and transmission of UL control information in a system to which CA is applied according to an embodiment of the disclosure is illustrated. For the ease of understanding, Figure 8 is a diagram for specifically describing Figure 7 an embodiment of the disclosure.

[0163] In operation 800, the UE can receive one or more DCIs from one or more cells in the (n-k)th subframe. Then, the UE can transmit the PUCCH to the PCell in the nth subframe.

[0164] In operation 810, the UE can determine whether there is UE-specific DCI received from the PCell in the (n-k)th subframe by using the value of k.

[0165] In operation 820, when there is UE-specific DCI received from the PCell, the UE can obtain the value of δ PUCCH from a TPC command field of the UE-specific DCI.

[0166] In operation 830, when there is no UE-specific DCI received from the PCell, the UE can determine whether there is UE-specific DCI received from the SCell.

[0167] In operation 840, when there is UE-specific DCI received from the SCell, the UE can obtain the value of δ PUCCH from a TPC command field of the DCI. When the UE receives two or more UE-specific DCIs from two or more SCells, the UE can obtain the value of δ PUCCH from a TPC command field of the UE-specific DCI received from the SCell according to a pre-defined rule between the BS and the UE. For example, the UE can obtain the value of δ PUCCH from a TPC command field of the UE-specific DCI received from the SCell having the lowest cell index.

[0168] In operation 850, when there is no UE-specific DCI received from the PCell and the SCell, the UE can determine whether there is group-common DCI received from the PCell.

[0169] In operation 860, when there is group-common DCI received from the PCell, the UE can obtain the value of δ PUCCH from the group-common DCI.

[0170] In operation 870, the UE can configure the value of δ PUCCH to 0 dB when there is no UE-specific DCI received from the PCell or the SCell and there is no group common DCI received from the PCell.

[0171] In operation 880, the UE can obtain resource information of the PUCCH from DCI transmitted from one of the PCell or the SCell. In an embodiment of the present disclosure, the BS can transmit the resource information of the PUCCH via UE-specific DCI (or group common DCI, which is the same as below) of the PCell and one or more SCells, and here, the BS can configure the resource information of the PUCCH transmitted via the UE-specific DCI to be the same in all cells and can transmit the resource information of the PUCCH to the UE. In another embodiment of the present disclosure, operation 885 can be performed after operation 880.

[0172] In operation 885, the UE can update the value of g(i) with the obtained δ PUCCH . In more detail, the UE can update the value of g(i) (where i = n) with the obtained δ PUCCH by using [Equation 2]. The UE can update the value of g(i) (where i = n) with δ PUCCH (where there is UE-specific DCI received from the PCell or the SCell or where there is group common DCI received from the PCell and there is no UE-specific DCI received from the SCell) or the value of δ PUCCH (where there is no UE-specific DCI or group common DCI received from the PCell and there is no UE-specific DCI received from the SCell) configured to 0 dB by using [Equation 2].

[0173] In operation 890, the UE can determine the transmission power of the PUCCH based on the updated value of g(i) and the obtained resource information of the PUCCH. In more detail, the UE can configure the value of P PUCCH (n) by using [Equation 1].

[0174] In operation 895, the UE can transmit the PUCCH based on the determined transmission power of the PUCCH. In more detail, the UE can transmit the PUCCH in the nth subframe by using P PUCCH (n) configured in operation 890.

[0175] Figure 9FIGS. 1 to 3 show diagrams for describing transmission of DL data and DL control information and transmission of UL control information in a system to which a CA is applied according to an embodiment of the present disclosure. For ease of understanding, Figure 9 is a diagram for specifically describing Figure 7 an embodiment of the present disclosure.

[0176] In operation 900, the UE can receive one or more DCIs from one or more cells in an (n-k)th subframe. Then, the UE can transmit a PUCCH to a PCell in an nth subframe.

[0177] In operation 910, the UE can determine whether there is UE-specific DCI received from the PCell in the (n-k)th subframe by using a value of k.

[0178] In operation 920, when there is UE-specific DCI received from the PCell, the UE can obtain a value of δ PUCCH from a TPC command field of the UE-specific DCI. According to an embodiment of the present disclosure, when there is no UE-specific DCI received from the PCell, the UE can determine whether there is group common DCI transmitted from the PCell, and when there is corresponding DCI, the UE can obtain a value of δ PUCCH from the group common DCI.

[0179] In operation 930, when there is no UE-specific DCI received from the PCell, the UE can determine whether there is group common DCI received from the PCell.

[0180] In operation 940, when there is group common DCI received from the PCell, the UE can obtain a value of δ PUCCH from the group common DCI. According to an embodiment of the present disclosure, when there is no UE-specific DCI received from the PCell, the UE can determine whether there is group common DCI transmitted from the PCell first, and when there is corresponding DCI, the UE can obtain a value of δ PUCCH from the group common DCI.

[0181] In operation 950, when there is no UE-specific DCI or group common DCI transmitted from the PCell, the UE can determine whether there is UE-specific DCI received from an SCell.

[0182] In operation 960, when there is UE-specific DCI received from the SCell, the UE can obtain a value of δ PUCCH from a TPC command field of the DCI. When the UE receives two or more UE-specific DCIs from two or more SCells, the UE can obtain a value of δ PUCCH from a TPC command field of the UE-specific DCI received from the SCell according to a pre-defined rule between the BS and the UE. For example, the UE can obtain a value of δ PUCCH from a TPC command field of the UE-specific DCI received from the SCell having the lowest cell index.

[0183] In operation 970, the UE can configure the value of δ PUCCH to 0 dB when there is no UE-specific DCI or group common DCI received from the PCell and no UE-specific DCI received from the SCell.

[0184] In operation 980, the UE can obtain resource information of the PUCCH from DCI transmitted from one of the PCell or the SCell. In an embodiment of the disclosure, the BS can transmit the resource information of the PUCCH via UE-specific DCI (or group common ID, same as below) of the PCell and one or more SCells, and here, the BS can configure the resource information of the PUCCH transmitted via the UE-specific DCI to be the same in all cells and can transmit the resource information of the PUCCH to the UE. In another embodiment of the disclosure, operation 985 can be performed after operation 980.

[0185] As another example of PUCCH resource information transmission by the BS, the BS can transmit the PUCCH resource information to the UE according to a pre-defined rule between the BS and the UE. That is, the BS can configure and transmit the PUCCH resource information via UE-specific DCI transmitted from one of the PCell or the SCell. According to an embodiment of the disclosure, the UE and the BS can be pre-defined to transmit the PUCCH resource information via UE-specific DCI transmitted from the PCell. In this case, the UE can obtain the PUCCH resource information via the UE-specific DCI transmitted from the PCell and can ignore the PUCCH resource information included in the UE-specific DCI transmitted from one SCell or multiple SCells, regardless of the configuration of the BS. As another example, the BS can configure a field of the PUCCH resource information with a specific value, the PUCCH resource information being included in the UE-specific DCI transmitted from one SCell or multiple SCells. For example, the BS can configure all bits of the field to be "0" or "1". Upon receiving this, the UE can ignore the field regarding the PUCCH resource information. Although an example in which the field regarding the PUCCH resource information included in the UE-specific DCI transmitted from one SCell or multiple SCells is configured with a specific value is provided, in general, the BS can transmit PUCCH resource information valid only for UE-specific DCI transmitted from a specific cell pre-defined with the UE and can transmit PUCCH resource information invalid for UE-specific DCI transmitted from other cells. In this regard, the invalid PUCCH resource information can be regarded as a field regarding the PUCCH resource information configured with a specific value.

[0186] As another example of the PUCCH resource information transmission by the BS, the BS can inform the UE of the PUCCH resource information via the UE-specific DCI transmitted from the PCell and the SCell having the lowest cell index. The UE that does not receive the UE-specific DCI from the PCell can obtain the PUCCH resource information via reception of the UE-specific DCI transmitted from the SCell having the lowest cell index.

[0187] The UE can obtain the PUCCH resource information from the UE-specific DCI transmitted from the PCell and the SCell having the lowest cell index, and can ignore the PUCCH resource information included in the UE-specific DCI transmitted from one SCell or a plurality of SCells regardless of the configuration of the BS. Alternatively, the BS can configure a specific value to a field of the PUCCH resource information included in the UE-specific DCI transmitted from one SCell or a plurality of SCells. For example, the BS can configure all bits of the field to "0" or "1".

[0188] As another example, the BS can inform the UE of the PUCCH resource information via the UE-specific DCI transmitted from a specific SCell. For example, the BS can inform the UE of the PUCCH resource information via the UE-specific DCI transmitted from the SCell having the lowest cell index. The UE can ignore the PUCCH resource information included in the UE-specific DCI transmitted from the PCell and the UE-specific DCI transmitted from one SCell or a plurality of SCells regardless of the configuration of the BS.

[0189] Alternatively, the BS can configure a specific value to a field of the PUCCH resource information included in the UE-specific DCI other than the UE-specific DCI from which the UE refers to obtain the PUCCH resource information. For example, the BS can configure all bits of the field to "0" or "1".

[0190] As another example, the BS can inform the UE of the PUCCH resource information via the UE-specific DCI transmitted from a specific SCell. For example, the BS can inform the UE of the PUCCH resource information via the UE-specific DCI transmitted from the SCell having the lowest cell index. The UE can ignore the PUCCH resource information included in the UE-specific DCI transmitted from the PCell and the UE-specific DCI transmitted from one SCell or a plurality of SCells regardless of the configuration of the BS.

[0191] Alternatively, the BS can configure a specific value to a field of the PUCCH resource information included in the UE-specific DCI other than the UE-specific DCI which the UE refers to in order to obtain the PUCCH resource information. For example, the BS can configure all bits of the field to "0" or "1".

[0192] As another example, the BS can inform the UE of a cell index to be referred to by the UE in order to obtain the PUCCH resource information via RRC signaling or a medium access control element (MAC CE).

[0193] When the index is obtained, the UE can obtain the PUCCH resource information from the UE-specific DCI transmitted from the cell having the index indicated by the BS. The UE can ignore the PUCCH resource information transmitted from the UE-specific DCI transmitted from one or more cells not having the index indicated by the BS.

[0194] In operation 985, the UE can update the value of g(i) with the obtained δ PUCCH . In more detail, the UE can update the value of g(i) (where i = n) with the obtained δ PUCCH using [Equation 2]. The UE can update the value of g(i) (where i = n) with the obtained δ PUCCH (where there is a case in which the UE-specific DCI is received from the PCell or the SCell or there is a case in which the group common DCI is received from the PCell and the UE-specific DCI is not received from the SCell) or δ PUCCH (where there is a case in which the UE-specific DCI or the group common DCI is not received from the PCell and the UE-specific DCI is not received from the SCell) configured as 0 dB using [Equation 2].

[0195] In operation 990, the UE can determine the transmission power of the PUCCH based on the updated value of g(i) and the obtained PUCCH resource information. In more detail, the UE can configure the value of P PUCCH (n) using [Equation 1].

[0196] In operation 995, the UE can transmit the PUCCH based on the determined transmission power of the PUCCH. In more detail, the UE can transmit the PUCCH in the nth subframe using P PUCCH (n) configured in operation 990.

[0197] Figure 10 A diagram for describing transmission of DL data and DL control information and transmission of UL control information in a system to which CA is applied is illustrated.

[0198] In operation 1000, the UE can receive one or more DCIs from one or more cells in an (n-k)th subframe. Then, the UE can transmit a PUCCH to a PCell in an nth subframe.

[0199] In operation 1010, the UE can determine whether both a UE-specific DCI and a group common DCI exist.

[0200] In operation 1020, when both the UE-specific DCI and the group common DCI exist, the UE can ignore the group common DCI.

[0201] In operation 1030, when neither the UE-specific DCI nor the group common DCI exists, the UE can determine whether the UE-specific DCI exists.

[0202] In operation 1040, when either both the UE-specific DCI and the group common DCI exist or only the UE-specific DCI exists, the UE can obtain a value of δ PUCCH from the UE-specific DCI. According to an embodiment of the present disclosure, the value of δ PUCCH may be obtained from all UE-specific DCIs received from the PCell and the one or more SCells. That is, the UE can accumulate and use all values of δ PUCCH included in the UE-specific DCIs. The value of δ PUCCH included in the group common DCI can not be accumulated.

[0203] In operation 1050, when the UE-specific DCI does not exist, the UE can configure the value of δ PUCCH to 0 dB.

[0204] In operation 1060, the UE can obtain resource information of the PUCCH from the DCI. As described above, the UE can obtain the resource information of the PUCCH by using various methods. In another embodiment of the present disclosure, operation 1070 can be performed after operation 1060.

[0205] In operation 1070, the UE can update a value of g(i) with the obtained δ PUCCH . In more detail, the UE can update the value of g(i) (where i = n) with the obtained δ PUCCH by using [Equation 2]. Since the UE can obtain the value of δ PUCCH from all UE-specific DCIs received from the PCell and the one or more SCells, the UE can accumulate and use all values of δ PUCCH included in the UE-specific DCIs. The value of δ PUCCH included in the group common DCI can not be accumulated.

[0206] In operation 1080, the UE can determine the transmission power of the PUCCH based on the updated value of g(i) and the obtained resource information of the PUCCH. In more detail, the UE can configure P PUCCH (n) of the value.

[0207] In operation 1090, the UE can transmit the PUCCH based on the determined transmission power of the PUCCH. In more detail, the UE can transmit the PUCCH by using P PUCCH (n) transmits the PUCCH in the nth subframe.

[0208] Figure 11 A diagram for describing a subframe and a slot according to an embodiment of the disclosure is illustrated.

[0209] One subframe can have a length of 1 ms on a time axis, and one slot can consist of 14 symbols. When a subcarrier spacing of 15 kHz is used, one slot consisting of 14 symbols has a length of 1 ms, and thus, one slot and one subframe can be the same.

[0210] When a subcarrier spacing of 30 kHz is used, one slot consisting of 14 symbols has a length of 0.5 ms, and thus, one subframe can consist of two slots. In addition, when a subcarrier spacing of 60 kHz is used, one slot consisting of 14 symbols has a length of 0.25 ms, and thus, one subframe can consist of four slots. Accordingly, when a subcarrier spacing Δf is N times 15 kHz, the number of slots constituting one subframe can increase by N times.

[0211] Accordingly, such a rule can be applied to a case in which a subcarrier spacing other than 15 kHz is used. Figure 11 A subcarrier spacing not illustrated. For example, in the case of using a subcarrier spacing of 120 kHz, Δf is 8 times 15 kHz, and thus, the number of slots constituting one subframe can be 8.

[0212] FIG. 12A illustrates a diagram for describing slot-based scheduling according to an embodiment of the disclosure.

[0213] The nth DL slot can consist of a PDCCH and a PDSCH, and the (n+k1)th UL slot can consist of a PUSCH and a PUCCH. Here, for convenience of description, the PDCCH of the nth slot consists of one symbol, but the PUCCH can consist of two or three symbols. Also, although it is shown that the position of the symbol on which the PDCCH is to be transmitted is the first symbol, the disclosure is not limited thereto. That is, the position of the symbol on which the PDCCH is to be transmitted can be the second symbol or after the second symbol. Also, although it is shown that the PUCCH is to be transmitted on the last symbol in the (n+k1)th slot, the PUCCH can be transmitted on a random position among the 14 symbols that constitute the (n+k1)th slot. Also, although it is shown that the PUCCH consists of one symbol, the number of symbols that constitute the PUCCH can be equal to or greater than 2 and equal to or less than 14.

[0214] FIG. 12B illustrates a graph for describing micro-slot-based scheduling according to an embodiment of the disclosure.

[0215] The DL micro-slot can consist of a PDCCH and a PDSCH in the nth DL slot. Here, although it is shown that the micro-slot consists of one PDCCH symbol and two PDSCHs, the disclosure is not limited thereto. That is, a case in which the number of PDSCH symbols used in DL slot-based scheduling is less than that can be referred to as a DL micro-slot.

[0216] The (n+k2)th UL slot can consist of a PUSCH and a PUCCH. Here, for convenience of description, it is shown that the UL micro-slot in the (n+k2)th UL slot consists of 5 symbols, but the disclosure is not limited thereto. That is, a case in which the number of PUSCH symbols used in UL slot-based scheduling is less than that can be referred to as a UL micro-slot. Also, although it is shown that the PUCCH is to be transmitted on the last symbol in the (n+k2)th slot, the PUCCH can be transmitted on a random position among the 14 symbols that constitute the (n+k2)th UL slot. Also, although it is shown that the PUCCH consists of one symbol, the number of symbols that constitute the PUCCH can be equal to or greater than 2 and equal to or less than 14.

[0217] Figure 13 A graph for describing a case in which slot-based scheduling and micro-slot-based scheduling coexist in a system to which CA is applied according to an embodiment of the disclosure is illustrated.

[0218] Assume that the BS transmits PDCCH and PDSCH in an n1th slot via slot-based scheduling on a carrier number 1 (CC#1) and that CC#1 is a PCell. Also, assume that the BS transmits PDCCH and PDSCH in an n2th slot via mini-slot-based scheduling in a mini-slot consisting of 3 symbols on a carrier number 2 (CC#2). Also, assume that the BS transmits PDCCH and PDSCH in an n3th slot via mini-slot-based scheduling in a mini-slot consisting of 5 symbols on a carrier number 3 (CC#3). Finally, assume that PUCCH is transmitted only via CC#1 which is a PCell.

[0219] Here, n1, n2, n3 can be different from each other, but it is possible that n1+k1=n2+k2=n3+k3. This can mean that HARQ-ACK / NACK information about PDSCHs consisting of slots or mini-slots and transmitted in DL of each CC can be transmitted via PUCCH of the same time.

[0220] Also, although it is shown in Figure 13 that PUCCH is transmitted via all cells, this is merely an example of a case in which a UE not supporting CA accesses a specific cell, considering a system. That is, UE-2 accessing CC#2 and not having CA support capability can receive PDCCH and PDSCH on a DL carrier of CC#2 and can transmit PUCCH on a UL carrier of CC#2.

[0221] Also, UE-3 accessing CC#3 and not having CA support capability can receive PDCCH and PDSCH on a DL carrier of CC#3 and can transmit PUCCH on a UL carrier of CC#2. Unlike this, UE-1 having CA support capability can receive PDCCH and PDSCH on DL carriers of CC#1, CC#2, and CC#3 and can transmit PUCCH on a UL carrier of CC#1. In this regard, assume that CC#1 is a PCell. Figure 13 Three CCs are shown, but the present disclosure can be applied to a CA scenario of at least four CCs.

[0222] Under the foregoing assumptions, a UE having CA support capability (e.g., UE-1) can obtain timing information (i.e., k1 value) of PUCCH indicating that PUCCH is to be transmitted in an (n1+k1)th slot, resource information of PUCCH transmitted in the (n1+k1)th slot, and a value of δ PUCCH for configuring a transmission power value of PUCCH from a DCI field of PDCCH transmitted in an n1th slot of CC#1.

[0223] UE-2 can obtain timing information of the PUCCH (i.e., k2 value) indicating that the PUCCH is to be transmitted in the (n2+k2)th slot, resource information of the PUCCH transmitted in the (n2+k2)th slot, and a value of δ PUCCH for configuring a transmission power value of the PUCCH from a DCI field of the PDCCH transmitted in a mini-slot within the nth2 slot of CC#2.

[0224] Likewise, UE-3 can obtain timing information of the PUCCH (i.e., k3 value) indicating that the PUCCH is to be transmitted in the (n3+k3)th slot, resource information of the PUCCH transmitted in the (n3+k3)th slot, and a value of δ PUCCH for configuring a transmission power value of the PUCCH from a DCI field of the PDCCH transmitted in a mini-slot within the nth3 slot of CC#3.

[0225] Figure 14 A diagram for describing transmission of DL data and DL control information and transmission of UL control information in a CA environment in which slot-based scheduling and mini-slot-based scheduling coexist according to an embodiment of the disclosure is illustrated.

[0226] In operation 1400, the UE can receive one or more DCIs from one or more cells. Here, the DCI can be a UE-specific DCI or a group common DCI. As Figure 13 indicated, the UE can receive, on each CC, a PDSCH and a PDCCH including control information on the PDSCH, which are transmitted via slot-based or mini-slot-based scheduling in the nth1 slot of CC#1, the nth2 slot of CC#2, and the nth3 slot of CC#3. In this regard, the PDCCH received on each CC is a PDCCH on slot-based or mini-slot-based scheduling, and thus, the DCI can be considered as a UE-specific DCI. Although Figure 13 not shown in FIG. 14B, the UE can receive, on each CC, a group common DCI in addition to the UE-specific DCI. Accordingly, the UE can need to update g(i) defined in [Equation 2] for a method of configuring a transmission power value of the PUCCH transmitted at n1+k1 = n2+k2 = n3+k3 as shown in FIG. 14B. That is, when the UE receives two or more UE-specific DCIs or group common DCIs, the UE can need to consider an accumulation method with respect to a value of δ PUCCH . Figure 13

[0227] In operation 1410, the UE can determine whether the received DCI is within a period. That is, because a value of δ PUCCH ​values considering the accumulation method, so in order to support this, the BS and the UE can determine a predefined period (or window) in advance.

[0228] In operation 1420, the UE can obtain at least one value of δ PUCCH from the received DCI. In more detail, the UE can obtain at least one value of δ PUCCH from the received DCI.

[0229] In operation 1430, when the received DCI is not within the period, the UE can configure all values of δ PUCCH of the received DCI to 0 dB.

[0230] In operation 1440, the UE can update the value of g(i) with the obtained or configured δ PUCCH . In more detail, the UE can update the value of g(i) with the obtained δ PUCCH by using [Equation 2] (where i = n).

[0231] In operation 1450, the UE can determine the transmission power of the PUCCH based on the updated value of g(i). In more detail, the UE can configure the value of P PUCCH (n) by using [Equation 1].

[0232] In operation 1460, the UE can transmit the PUCCH based on the determined transmission power of the PUCCH. In more detail, the UE can transmit the PUCCH in the nth subframe with P PUCCH (n) configured in operation 1450.

[0233] FIGS. 15A and 15B are diagrams for describing the start time and the end time of the accumulation of the values of δ PUCCH according to an embodiment of the disclosure.

[0234] FIG. 15A illustrates a diagram for describing the start time and the end time of the accumulation of the values of δ PUCCH according to an embodiment of the disclosure. FIG. 15B illustrates an example in which PDCCH-2 is received after PUCCH-1 is transmitted.

[0235] According to an embodiment of the disclosure, the UE can consider the time at which the reception of the UE-specific DCI including information on the current PUCCH transmission ends as the time to start accumulating the values of δ PUCCH , and can obtain the values of δ PUCCH from all DCIs (one or more UE-specific DCIs and group-common DCIs transmitted from one or more cells) received within a predefined period from the time at which the UE-specific DCI is received, and can accumulate all obtained δPUCCH The value of .

[0236] The PDCCH-2 indication includes a UE-specific DCI containing information about the PUCCH-2 currently being transmitted by the UE, and the PDCCH-1 indication includes a UE-specific DCI containing information about the PUCCH-1 transmitted immediately preceding the currently transmitted PUCCH-2. Here, the BS and UE can predefine that only indication δ can be transmitted from the PCell. PUCCH The UE-specific DCI starts with the accumulation of values ​​(i.e., the UE-specific DCI that includes information about the transmission of PUCCH-2 to be transmitted).

[0237] The BS and UE can predefine the UE-specific DCI indication δ transmitted from a specific SCell when no UE-specific DCI is transmitted from the PCell. PUCCH The accumulation of values ​​begins. Here, the BS and UE can predefine that a particular SCell is the cell with the lowest cell index (or the cell with the highest cell index) within the SCell. As another example, the BS can configure the UE to indicate δ. PUCCH The cell index from which the value is accumulated. Upon receiving this, the UE can begin accumulating δ at the moment of the end of reception of UE-specific DCI transmitted from the cell with that cell index. PUCCH The value of .

[0238] δ PUCCH The accumulation of δ can end before the transmission of the current PUCCH (PUCCH-2). In other words, the UE can begin accumulating δ at the moment the reception of PDCCH-2 ends. PUCCH The value of δ can then be accumulated at the start of the PUCCH-2 launch. PUCCH The value of . However, in this case, the UE can use δ PUCCH The accumulated value is used to update the value of g(i) in [Equation 2], and the time period for configuring the transmit power used for PUCCH transmission may be insufficient. Here, δ PUCCH The accumulation of values ​​can end before the start of the current PUCCH (PUCCH-2) to be emitted. This is marked as offset in Figures 15A and 15B.

[0239] This offset information must be determined taking into account the UE's processing time capabilities and can be a predefined value. Alternatively, the BS can configure the offset information to the UE via RRC signaling. Alternatively, the UE can calculate the offset information based on the value configured by the BS.

[0240] Figures 16A and 16B illustrate δ for describing embodiments according to this disclosure. PUCCHa graph of a start time and an end time of accumulation of a value of δ

[0241] FIG. 16A illustrates an example in which PDCCH-2 is received before PUCCH-1 is transmitted, and FIG. 16B illustrates an example in which PDCCH-2 is received after PUCCH-1 is transmitted.

[0242] As another example of the start of accumulation of a value of δ PUCCH As illustrated in FIGS. 16A and 16B, accumulation of a value of δ PUCCH may start based on a previously transmitted PUCCH (PUCCH-1), rather than in a manner in which accumulation of a value of δ PUCCH may start based on UE-specific DCI including information about a current transmission of a PUCCH (PUCCH-2) as described above with reference to FIGS. 15A and 15B. In more detail, a PUCCH to be transmitted in an (n1+k1)th slot of δ Figure 13 is defined as a "currently transmitted PUCCH (PUCCH-2 of FIG. 16A)", and a PUCCH transmitted immediately before the currently transmitted PUCCH is defined as an "immediately previously transmitted PUCCH (PUCCH-1 of FIG. 16A)".

[0243] In this regard, the start of accumulation of a value of δ PUCCH may be determined based on a transmission time of the immediately previously transmitted PUCCH (PUCCH-1). That is, the UE can start accumulating a value of δ PUCCH based on a transmission start time of the immediately previously transmitted PUCCH (PUCCH-1) (or a transmission end time of PUCCH-1).

[0244] For example, in a case in which the transmission time of the immediately previously transmitted PUCCH-1 is a pth symbol of a jth slot and PUCCH-1 consists of L symbols, the UE can start accumulating a value of δ PUCCH on symbols after the pth symbol of the jth slot (based on a transmission start time of PUCCH-1). Alternatively, the UE can start accumulating a value of δ PUCCH on symbols after a (p+L)th symbol of the jth slot (based on a transmission end time of PUCCH-1).

[0245] Likewise, as illustrated in FIGS. 16A and 16B, the end of accumulation of a value of δ PUCCH may be performed at a time of reception end of PDCCH-2 including information about the currently transmitted PUCCH-2. Although not illustrated in FIGS. 16A and 16B, the end of accumulation of a value of δ PUCCHthe accumulation of the value of δ

[0246] Here, the BS and the UE can predefine that only the UE-specific DCI transmitted from the PCell indicates the end of the accumulation of the value of δ PUCCH . The BS and the UE can predefine that the UE-specific DCI transmitted from a specific SCell indicates the end of the accumulation of the value of δ PUCCH when there is no UE-specific DCI transmitted from the PCell. For example, the BS and the UE can predefine that the specific SCell is a cell having the lowest cell index (or a cell having the highest cell index) among the SCells.

[0247] In another embodiment of the disclosure, the BS can configure the UE with a cell index indicating the end of the accumulation of the value of δ PUCCH . Upon receiving this, the UE can accumulate the value of δ PUCCH until the time of the end of the reception of the UE-specific DCI transmitted from the cell having the cell index.

[0248] In another embodiment of the disclosure, the BS and the UE can predefine that the UE-specific DCI indicating the end of the accumulation of the value of δ PUCCH may be transmitted from the same cell as the cell index from which the aforementioned UE-specific DCI indicating the start of the accumulation of the value of δ PUCCH is transmitted.

[0249] In another embodiment of the disclosure, the UE can start the accumulation of the value of δ PUCCH from a specific offset from the time of the start of the transmission of the PUCCH (PUCCH-1) immediately after the previously transmitted PUCCH (PUCCH-1) (or the time of the end of the transmission of PUCCH-1). This will be described in detail with reference to FIG. 17A.

[0250] The end of the accumulation of the value of δ PUCCH may be performed until the start of the transmission of the currently transmitted PUCCH (PUCCH-2), or may be performed until an offset with respect to the transmission of the currently transmitted PUCCH (PUCCH-2).

[0251] FIGS. 17A and 17B illustrate graphs for describing the start time and the end time of the accumulation of the value of δ PUCCH according to an embodiment of the disclosure.

[0252] FIG. 17A illustrates an example of a case in which PDCCH-2 is received after PUCCH-1 is transmitted, and FIG. 17B illustrates an example of a case in which PDCCH-2 is received before PUCCH-1 is transmitted.

[0253] In another embodiment of the disclosure, the accumulation of the value of δ PUCCH may be performed at the time point at which the reception of the PDCCH-2 including information about the currently to-be-transmitted PUCCH-2 ends, as shown in FIGS. 16A to 17B. Also, although not shown in FIGS. 16A to 17B, the accumulation of the value of δ PUCCH may end at the time point at which the reception of the PDCCH-2 starts.

[0254] In FIG. 17A, it is assumed that the transmission time immediately after the previously transmitted PUCCH (PUCCH-1) is the p-th symbol of the j-th slot and the PUCCH-1 consists of L symbols. Also, it is assumed that the offset value is K symbols.

[0255] In this case, the UE can start accumulating the value of δ PUCCH before (or after) K symbols from the p-th symbol of the j-th slot based on the transmission start time point immediately after the previously transmitted PUCCH-1 (PUCCH-1). In another embodiment of the disclosure, the UE can start accumulating the value of δ PUCCH before (or after) K symbols from the (p+L)-th symbol of the j-th slot based on the transmission end time point immediately after the previously transmitted PUCCH-1 (PUCCH-1).

[0256] The offset value can be a predefined value, or the BS can configure the offset value to the UE via RRC signaling. Alternatively, the UE can calculate the offset value based on a value configured by the BS.

[0257] According to an embodiment of the disclosure, the offset value is a symbol, but the embodiment of the disclosure can be applied to a case in which the offset value is a slot or a subframe. Also, in FIG. 17A, likewise, the UE can start accumulating the value of δ PUCCH by a certain offset.

[0258] However, when the accumulation of the value of δ PUCCH is started and ended by using the above-described method, that is, when the reception of the PUCCH-2 is performed before the transmission of the PUCCH-1, as shown in FIG. 17B, the UE can not be able to perform the accumulation of the value of δ PUCCH . In this case, the UE can not accumulate the value of δ PUCCH . That is, the value of δ PUCCH may be configured to 0.

[0259] In another embodiment of the disclosure, regarding the accumulation of the value of δ PUCCH , the UE can not use the start time point of the accumulation of the value of δ PUCCH and the end time point of the accumulation of the value of δ PUCCH , but can use δPUCCH the start time of accumulation of the value of δ PUCCH the period in which accumulation of the value of δ PUCCH is performed. In this case, it can be necessary to provide configuration about how long the UE must perform accumulation of the value of δ PUCCH As an example thereof, the BS can configure the period, i.e., the value of the window in which accumulation is performed, via RRC signaling. Upon receiving this, the UE can accumulate the value of δ PUCCH from one or more DCIs received from one or more cells during the window configured by the BS via RRC, which starts from the time at which reception of the UE-specific DCI indicating the start of accumulation of the value of δ

[0260] When no DCI is received during the predefined window or the predefined period configured by the BS, the UE can configure the value of δ PUCCH to 0 dB. By using the accumulated value of δ PUCCH or the value of δ PUCCH configured to 0 dB, the UE can update the value of g(i) by using [Equation 2] (where i = n1+k1 = n2+k2 = n3+k3). The UE can configure the transmission power value of the PUCCH to be transmitted to the PCell based on the updated value of g(i) and the PUCCH resource information obtained from the UE-specific DCI. Then, the UE can transmit the PUCCH in the (n1+k1)th UL slot based on the configured transmission power value of the PUCCH.

[0261] Referring to FIG. 17B, a description is provided of the start time and the end time of accumulation of the value of δ PUCCH for transmission of the PUCCH, but the description can equally apply to the start time and the end time of accumulation of the value of δ PUCCH for transmission of the PUSCH. For example, PUCCH-1 of FIG. 17B can be considered as PUSCH-1, and PUCCH-2 can be considered as PUSCH-2. PDCCH-2 can be considered as a UE-specific DCI including resource allocation information about transmission of PUSCH-2, etc. In this regard, PUSCH-1 can not be a PUSCH to which resources are allocated via a UE-specific DCI (a grant-based PUSCH), but can be an unlicensed PUSCH configured via RRC. In this case, PDCCH-2 can be received before PUSCH-1 is transmitted, and as described with reference to FIG. 17B, accumulation of δ PUCCH can be performed, the transmission power of the PUSCH can be configured, and then the PUSCH can be transmitted.

[0262] Figure 18 is shown for describing accumulation of δ PUCCHa start time and an end time of accumulation of the value of δ

[0263] As Figure 18 illustrated, the order of the start time and the end time can be exchanged. In this case, as Figure 18 illustrated, the PDCCH-1 can include the resource allocation of the PDSCH-1 and the transmission information of the PUCCH-1, and the PDCCH-2 can include the resource allocation of the PDSCH-2 and the transmission information of the PUCCH-2. As described with reference to FIGS. 12A, 12B, and Figure 13

[0264] Thus, as Figure 18 illustrated, after the UE receives the PDCCH (PDCCH-2) including the information about the PUCCH (PUCCH-2) to be currently transmitted, the UE can receive the PDCCH (PDCCH-1) including the information about the PUCCH (PUCCH-1) previously transmitted.

[0265] Here, as described with reference to FIG. 16, when a start time of accumulation of the value of δ PUCCH and an end time of accumulation of the value of δ PUCCH are used, the order of the start time and the end time can be exchanged. In this case, the UE can not perform accumulation of the value of δ PUCCH . That is, the value of δ PUCCH may be configured to 0.

[0266] In another embodiment of the disclosure, the start time and the end time of accumulation of the value of δ PUCCH may be equal to each other. In this case, the UE can accumulate the value of δ PUCCH obtained from one or more DCIs received at the start time of accumulation of the value of δ PUCCH (or the end time of accumulation of the value of δ PUCCH ) by using the above-described method.

[0267] In the foregoing embodiment using the start time of accumulation of the value of δ PUCCH and the accumulation window period, there can be a case in which the accumulation window period is 0 (i.e., only the start time of accumulation of the value of δ PUCCH is received). In this case, the UE can accumulate the value of δ PUCCH obtained from one or more DCIs received only at the start time of accumulation of the value of δ PUCCH ​value. That is, a case where the accumulation window period is 0 can be processed as δ PUCCH the start time and the end time of accumulation of the value of δ PUCCH the value of δ PUCCH The value of δ

[0268] Referring to Figure 14 , a method of accumulating the value of δ PUCCH has been described when the UE receives two or more DCIs from one or more cells in a CA environment, but the disclosure is not limited to this environment and can be applied to a case where two or more DCIs are received from one cell.

[0269] When the UE receives one DCI or two or more DCIs from one cell or two or more cells in a system to which CA is applied, by using the UL transmission power control method according to the disclosure, the UE can ensure UL performance by accumulating the values of the transmission power control parameters obtained from the DCI and can minimize interference to neighboring cells.

[0270] Referring to FIGS. 15A to Figure 18 , an accumulation method for determining PUSCH or PUCCH transmission power is described. According to another embodiment of the disclosure, the PUSCH or PUCCH transmission power can be determined according to the uplink power control of 3GPP TS 38.213 Section 7.

[0271] Figure 19 A procedure in which a BS controls the transmission power of a UE in a cellular system according to an embodiment of the disclosure is shown.

[0272] In operation 1910, the UE within the coverage of the BS can perform DL synchronization with the BS and can obtain system information. According to some embodiments of the disclosure, the DL synchronization can be performed via a primary synchronization signal / secondary synchronization signal (PSS / SSS) received from the BS. The UE performing the DL synchronization can receive a master information block (MIB) and a system information block (SIB) and obtain system information from the BS.

[0273] In operation 1915, the UE can perform UL synchronization with the BS via a random access procedure and can establish an RRC connection. In the random access procedure, the UE can transmit a random access preamble and a message 3 (msg3) to the BS via UL. Here, when the random access preamble and the msg3 are transmitted, UL transmission power control can be performed. In detail, the UE can receive a parameter for UL transmission power control from the BS via obtained system information (e.g., SIB), or can perform UL transmission power control by using a pre-defined parameter. In another embodiment of the disclosure, the UE can measure a reference signal received power (RSRP) according to a path loss estimation signal transmitted from the BS, and can estimate a DL path loss value by using [Equation 3]. Then, based on the estimated DL path loss value, the UE can configure a UL transmission power value for transmitting the random access preamble and the msg3.

[0274] [Equation 3]

[0275] DL path loss = Transmission power of BS signal - RSRP measured by UE.

[0276] In [Equation 3], the transmission power of the BS signal indicates a transmission power of a DL path loss estimation signal transmitted by the BS. The DL path loss estimation signal transmitted by the BS can be a CRS or a synchronization signal block (SSB). When the path loss estimation signal is the CRS, the transmission power of the BS signal can indicate a transmission power of the CRS, and can be transmitted to the UE via a referenceSignalPower parameter of system information. When the path loss estimation signal is the SSB, the transmission power of the BS signal can indicate transmission powers of a secondary synchronization signal (SSS) and a demodulation reference signal (DMRS) transmitted via a physical broadcast channel (PBCH), and can be transmitted to the UE via an ss-PBCH-BlockPower parameter.

[0277] In operation 1920, the UE can receive RRC parameters for UL transmission power control from the BS via UE-specific RRC signaling or common RRC signaling. The received transmission power control parameters can be different from each other according to types of UL channels and types of signals. That is, transmission power control parameters to be applied to transmissions of PUCCH, PUSCH, and SRS can be different from each other. In addition, as described above, the transmission power control parameters received by the UE from the BS via the SIB before the RRC connection is established or the transmission power control parameters used as pre-defined values by the UE before the RRC connection is established can be included in the RRC parameters transmitted from the BS after the RRC connection is established. The UE can use RRC parameter values received from the BS after the RRC connection is established in order to control UL transmission power.

[0278] In operation 1925, the UE can receive a path attenuation estimation signal from the BS. In detail, after the RRC connection with the UE is established, the BS can configure a channel state information reference signal (CSI-RS) as an attenuation estimation signal for the UE. In this case, the BS can transmit information about the transmission power of the CSI-RS to the UE via the powerControlOffsetSS parameter of the UE-specific RRC information. Here, the powerControlOffsetSS can indicate the transmission power offset between the SSB and the CSI-RS.

[0279] In operation 1930, the UE can estimate a DL path attenuation value and can configure a UL transmission power value. In more detail, the UE can measure the DL RSRP by using the CSI-RS and can estimate the DL path attenuation value by using [Equation 1] via the use of the information about the transmission power of the CSI-RS received from the BS. Then, based on the estimated DL path attenuation value, the UE can configure the UL transmission power value for the transmission of the PUCCH, the PUSCH, and the SRS.

[0280] In operation 1935, the UE can perform a power headroom report (PHR) to the BS. The power headroom can indicate the difference value between the current transmission power of the UE and the maximum output power of the UE.

[0281] In operation 1940, the UE can optimize the system operation based on the reported power headroom. For example, when the value of the power headroom reported by a specific UE to the BS is a positive value, the BS can allocate more resource blocks (RBs) to the specific UE, thereby increasing the system throughput.

[0282] In operation 1945, the UE can receive a transmission power control command (TPC) from the BS. When the value of the power headroom reported by a specific UE to the BS is a negative value, the BS can allocate less resources to the specific UE or can reduce the transmission power of the specific UE via the TPC. By doing so, the BS can increase the system throughput or can reduce the unnecessary power consumption of the UE.

[0283] In operation 1950, the UE can update the transmission power based on the TPC command. Here, the TPC command can be transmitted to the UE via the UE-specific DCI or the group-common DCI. Accordingly, the BS can dynamically control the transmission power of the UE via the TPC command.

[0284] In operation 1955, the UE can perform the UL transmission based on the updated transmission power.

[0285] In another embodiment of the disclosure, in the description provided above, the PUCCH can be replaced with the PUSCH. Figures 1 to 19 In the description provided above, the PUCCH can be replaced with the PUSCH.

[0286] In the 5G communication system, the PUSCH transmission power can be determined by using [Equation 4].

[0287] [Equation 4]

[0288]

[0289] In [Equation 4], P CMAX，f，c (i) indicates a maximum transmission power configured for the UE with respect to a carrier f of a serving cell c in a PUSCH transmission occasion i. is a reference transmission power configuration value according to the configuration of an active UL bandwidth part (BWP) of a carrier f of a serving cell c, and has different values according to various transmission types j. In the case of a PUSCH transmission corresponding to a message 3 PUSCH of random access, a configured grant PUSCH, or how the PUSCH is scheduled, can have various values. indicates the size of a frequency to which the PUSCH is allocated. b，f，c (j) indicates a compensation rate level value of a path loss with respect to an UL BWP b of a carrier f of a serving cell c, can be configured by an upper layer signal, and can have different values according to j. PL b，f，c (qd) is a DL path loss estimation value of an UL BWP b of a carrier f of a serving cell c, and uses a value measured via a reference signal in an active DL BWP. The reference signal can be an SS / PBCH block or a CSI-RS. As described with respect to [Equation 3], the DL path loss can be calculated. In another embodiment of the disclosure, PL b，f，c (qd) is a DL path attenuation value and indicates a path attenuation calculated by the UE using [Equation 3]. According to the configuration of an upper layer signal, the UE calculates the path attenuation based on a reference signal resource associated with an SS / PBCH block or a CSI-RS. The reference signal resource can be selected from various reference signal resource sets of an upper layer signal or an L1 signal, and the UE calculates the path attenuation based on the reference signal resource. Δ TF，b，f，c (i) is a value determined by a modulation and coding scheme (MCS) value of a PUSCH in a PUSCH transmission occasion i of an UL BWP b of a carrier f of a serving cell c. f b，f，c (i, l) is a power adjustment adaptation value, and the UE can dynamically adjust the power value in response to a TPC command.

[0290] The TPC command is divided into an accumulative mode and an absolute mode, and one of the two modes is determined by an upper layer signal. In the accumulative mode, the currently determined power adjustment adaptation value is accumulated to a value indicated by the TPC command, can be increased or decreased in response to the TPC command, and has fb，f，c (i, l) = f b，f，c (i-i0, l) + ∑δ PUSCH，b，f，c The relationship of δ PUSCH，b，f，c is a value indicated by a TPC command. In the absolute mode, the value is determined by the TPC command regardless of the currently determined power adjustment adaptation value and has a value of f b，f，c (i, l) = δ PUSCH，b，f，c The following [Table 6] shows values that can be indicated by a TPC command.

[0291] [Table 6] TPC command

[0292]

[0293] The following [Equation 4-1] is an equation for determining a PUCCH transmission power.

[0294] [Equation 4-1]

[0295]

[0296] In [Equation 4-1], is a configured reference transmission power configuration value, has different values according to various transmission types qu, and its value can be changed through RRC or upper layer signaling such as a MAC CE. When the value is changed through the MAC CE, the UE can determine that the value will be applied from a slot k+k offset offset according to a subcarrier spacing, and can have, for example, 3 ms. is a frequency resource set size to which a PUCCH is allocated. PL b，f，c (qd) is a path attenuation estimation value of the UE, and as described in [Equation 4], the UE calculates the value based on a specific reference signal in a CSI-RS or SS / PBCH according to the configuration of an upper layer signal and various transmission types j. The same q d is applied to a PUCCH that is repeatedly transmitted. The same q u is applied to a PUCCH that is repeatedly transmitted.

[0297] Figure 20 A diagram showing a PUSCH repetition transmission method according to an embodiment of the disclosure is shown. In more detail, Figure 20A case in which PUSCH is scheduled with DCI information transmitted via PDCCH is shown. PUSCH is repeatedly transmitted four times, and PUSCH repetition transmission can be performed in units of slots and repeated with the same start time and length. The number of times that PUSCH repetition transmission is performed can be determined by an upper layer signal or an L1 signal. In another embodiment of the disclosure, PUSCH can be repeatedly and periodically received and transmitted without PDCCH. Here, the number of times of repeated transmission can be determined by an L1 signal or an upper layer signal for activating a corresponding configured grant (CG) PUSCH.

[0298] PUSCH repetition transmission of a UE is a method for expanding the coverage of a BS or increasing the data reception reliability of a BS. 5G NR supports two types of data repetition transmission, which are PUSCH repetition transmission type A and PUSCH repetition transmission type B.

[0299] PUSCH repetition transmission type A indicates PUSCH repetition transmission in units of slots and is characterized in that the start symbol and length of PUSCH repeatedly transmitted over several slots are all equal. PUSCH repetition transmission type B indicates PUSCH repetition transmission in units of non-slots and is characterized in that the start symbol or length of PUSCH repeatedly transmitted over one or more slots are equal to or different from each other.

[0300] In general, the transmission power of a UE is lower than that of a BS, and thus, the UL coverage can be smaller than the DL coverage. To solve the problem, a repetition transmission scheme according to time can be considered. When repetition transmission is performed, the receiver can receive more energy, and thus, the demodulation / decoding performance can be further enhanced. When repetition transmission is performed, the receiver can receive more energy, and thus, the demodulation / decoding performance can be further enhanced.

[0301] Hereinafter, a method of allocating a time domain resource for a data channel in a 5G communication system will now be described.

[0302] A BS can configure a UE with a table for time domain resource allocation information on a DL data channel (PDSCH) and a UL data channel (PUSCH) via higher layer signaling (e.g., RRC signaling).

[0303] A BS can configure a table consisting of up to maxNrofDL-Allocations = 16 entries for PDSCH and can configure a table consisting of up to maxNrofUL-Allocations = 16 entries for PUSCH. Time domain resource allocation information can include, for example, PDCCH-to-PDSCH slot timing (corresponding to a time interval in slots between the time of receiving a PDCCH and the time of transmitting a PDSCH scheduled by the received PDCCH, and denoted as K0), PDCCH-to-PUSCH slot timing (corresponding to a time interval in slots between the time of receiving a PDCCH and the time of transmitting a PUSCH scheduled by the received PDCCH, and denoted as K2), information on the position and length of a starting symbol in a slot on which a PDSCH or a PUSCH is scheduled, mapping type of a PDSCH or a PUSCH, etc. For example, a UE can be informed of a plurality of pieces of information such as at least one of [Table 7] to [Table 9].

[0304] [Table 7]

[0305]

[0306] [Table 8]

[0307]

[0308] [Table 9]

[0309]

[0310] A BS can inform a UE of one of the entries in the table of time domain resource allocation information via L1 signaling (e.g., DCI) (e.g., the BS can inform the UE by using a "time domain resource allocation" field in DCI). The UE can obtain time domain resource allocation information on a PDSCH or a PUSCH based on the DCI received from the BS. The bit size of the DCI field is determined based on the number of entries configured in [Table 7] to [Table 9]. For example, when a total of 4 entries are configured for the entire PUSCH scheduling by an upper layer signal, the "time domain resource allocation" field in DCI can be determined as 2 bits.

[0311] Hereinafter, UL PUSCH repetition transmission in a 5G system will now be described in detail.

[0312] A 5G communication system supports two types, i.e., PUSCH repetition transmission Type A and PUSCH repetition transmission Type B, as a repetition transmission method of an UL data channel. The PUSCH repetition transmission Type A and the PUSCH repetition transmission Type B can be configured by an upper layer signal according to each scheduling DCI format.

[0313] 1. PUSCH repetition Type A

[0314] - As described above, as a time domain resource allocation method in one slot, a starting symbol and a length of a UL data channel can be determined, and the BS can inform the UE of the number of repetition transmissions via higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0315] - Based on the number of repetition transmissions received from the BS, the UE repeatedly transmits the UL data channel in consecutive slots, the UL data channel having the same starting symbol and length as the determined starting symbol and length of the UL data channel. That is, the number of repetition transmissions of the slot provided by the upper layer signaling or the L1 signal repeatedly transmits the PUSCH having the same starting symbol and the same symbol length in units of slots. The slot (Ks) transmitted or received on the first repeatedly transmitted PUSCH is determined by . n indicates a slot in which the scheduling DCI is transmitted or received, and K2 indicates an offset value between the scheduling DCI and the PUSCH based on a subcarrier spacing in which the PUSCH is transmitted or received. PUSCH , μ PDCCH indicates a subcarrier spacing value of the PUSCH and the PDCCH, and indicates a subcarrier spacing of 15·2 μ kHz kHz.

[0316] In this regard, when at least one symbol in the UL data channel signal indicated for the UE by the first signal is configured as DL according to the information indicated by the second signal, the UE can skip the transmission of the UL data channel. That is, although at least one symbol is included in the number of UL data repetition transmissions, the UL data channel is not transmitted. For example, in the case where four UL data repetition transmissions are indicated by the first signal, when at least one symbol of the second UL data repetition transmission resource is indicated as a DL symbol by the second signal, the UE can perform the first, third, and fourth UL data repetition transmissions except for the second UL data repetition transmission.

[0317] - When the number of repetition transmissions is K, in the PUSCH repetition Type A, the same symbol allocation is applied to K consecutive symbols, and the PUSCH has a single transmission layer. The UE must repeatedly transmit the same transport block (TB) in K consecutive slots to which the same symbol is applied for each slot. The same symbol allocation means that the starting symbol and the length of each slot of the PUSCH are the same. The redundancy version (RV) value with respect to the nth repetition transmission can be used in the following [Table 10]. [Table 10] can be applied to both the repetition Type A and the repetition Type B.

[0318] [Table 10]

[0319]

[0320] [Table 11] indicates the range of valid starting symbol (S) and length (L) for PUSCH resource allocation. PUSCH mapping type includes Type A and Type B, where Type A indicates that the DMRS position of PUSCH is always fixed at a specific symbol in a slot, for example, fixed at the third or fourth symbol, and Type B indicates that the position of PUSCH is fixed at the first symbol of the allocated PUSCH. PUSCH mapping Type A is applied only to PUSCH repetition Type A, and PUSCH mapping Type B is applied to both PUSCH repetition Type A and PUSCH repetition Type B.

[0321] [Table 11]

[0322]

[0323] In PUSCH repetition Type A, the number of repetitions (K value) is determined as follows. When Numberofrepetitions is present in the table of resource allocation, the K value is Numberofrepetitions, and when Numberofrepetitions is not present in the table, if pusch-AggregationFactor is configured through upper layer signaling, the K value is pusch-AggregationFactor. When both Numberofrepetitions and pusch-AggregationFactor are not configured, the K value is 1.

[0324] 2. PUSCH repetition transmission Type B

[0325] - As described above, as a time domain resource allocation method in one slot, the starting symbol and length of the UL data channel can be determined, and the BS can inform the UE of the number of repetitions (numberofrepetitions) of the repetition transmission via higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0326] - Based on the determined starting symbol and length of the UL data channel, the nominal repetition of the UE data channel is determined as follows. In which the slot in which the nth nominal repetition starts is given by , and the symbol in which it starts in the slot is given by . In which the slot in which the nth nominal repetition ends is given by , and the symbol in which it ends in the slot is given by is given by S + nL, where n = 0,..., numberofrepetitions - 1, where S indicates the starting symbol of the determined UL data channel and L indicates the symbol length of the determined UL data channel. K s indicates the slot in which the PUSCH transmission starts, and indicates the number of symbols per slot.

[0327] - A UE can determine invalid symbols for PUSCH repetition transmission Type B. Symbols configured as DL by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated are considered invalid symbols for PUSCH repetition transmission Type B. In addition, in unpaired spectrum, symbols indicated by ssb-PositionsInBurst in ServingCellConfigCommon of SIB1 or SS / PBCH block are considered invalid symbols, ssb-PositionsInBurst is information indicating the position for transmitting or receiving PSS / SSS / PBCH. In addition, in unpaired spectrum, symbols indicated as PDCCH region of SIB1 for receiving control resource set (CORESET) for Type0-PDCCH CSS indicated by MIB are considered invalid symbols. In unpaired spectrum, when numberInvalidSymbolsForDL-UL-Switching higher layer signaling is configured, symbols indicated by numberInvalidSymbolsForDL-UL-Switching higher layer signaling after the last symbol in a set of all consecutive symbols consisting of DL symbols indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated indicating TDD configuration information are considered invalid symbols. Here, the reference subcarrier spacing of symbols indicated by numberInvalidSymbolsForDL-UL-Switching higher layer signaling follows referenceSubcarrierSpacing higher layer signaling in tdd-UL-DL-ConfigurationCommon. In addition, invalid symbols can be configured by a higher layer parameter (e.g., InvalidSymbolPattern). The higher layer parameter (e.g., InvalidSymbolPattern) can provide a symbol-level bitmap extending over one slot or two slots, thereby configuring invalid symbols. When the bitmap indicates 1, it indicates invalid symbols. In addition, the periodicity and pattern of the bitmap can be configured by a higher layer parameter (e.g., periodicityAndPattern).When a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 parameter or the InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the UE applies the invalid symbol pattern, and when it indicates 0, the UE does not apply the invalid symbol pattern. When a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 parameter or the InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not configured, the UE applies the invalid symbol pattern. In addition, in the case where the UE has a half-duplex constraint and cannot simultaneously perform transmission and reception with respect to multiple cells, when the UE is not configured to monitor DCI format 2_0, symbols on which the UE receives SS / PBCH from a specific cell are considered to be invalid symbols with respect to all cells including the specific cell, and similarly, symbols indicated as DL with respect to a specific reference cell through a UE-common or UE-specific upper layer symbol (such as tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) and symbols configured for reception of PDCCH, PDSCH, or CSI-RS through an upper layer signal are considered to be invalid symbols with respect to other cells.

[0328] After determining the invalid symbols in each nominal repetition, the UE can consider the remaining symbols to be valid symbols. If one or more valid symbols are included in each nominal repetition, the nominal repetition can include one or more actual repetitions. Here, each actual repetition can include a set of consecutive valid symbols that can be used in one slot for PUSCH repetition transmission Type B. Except for the case where L = 1, an actual repetition consisting of one symbol is skipped, and the UE does not transmit the actual PUSCH.

[0329] As described above, in Figure 20 In PUSCH repetition transmission Type B, the nominal repetition is basically scheduled by an upper layer signal and an L1 signal, and then the slot boundary or whether there are invalid symbols are determined, so that the actual repetition that the UE finally has to perform transmission is determined. In Figure 20In the middle, Number of repetitions is considered to be 4. Regardless of the slot boundary or individual symbols, in the nominal repetition, PUSCH is repeatedly scheduled after the first PUSCH is scheduled. The UE determines the actual repetition resources actually transmitted based on the PUSCH repetition Type B scheduling information, and when all symbols are valid symbols, the UE can transmit PUSCH with respect to the slot boundary in slots i, i+1, and i+2. Figure 20 The PUSCH consisting of 6 actual PUSCH repetitions (i, i+1, i+2, i+3, i+4, i+5) is repeatedly transmitted over slots i, i+1, and i+2 with respect to the slot boundary when PUSCH repetition Type B scheduling. When PUSCH repetition Type B scheduling, the UE can determine the transport block size (TBS) based on the L value indicated by the scheduling DCI. The L value can be equal to or greater than each of the PUSCH transmission lengths actually transmitted by the UE. In Figure 20 In the middle, Number of repetitions is considered to be 4. Regardless of the slot boundary or individual symbols, in the nominal repetition, PUSCH is repeatedly scheduled after the first PUSCH is scheduled. The UE determines the actual repetition resources actually transmitted based on the PUSCH repetition Type B scheduling information, and when all symbols are valid symbols, the UE can transmit PUSCH with respect to the slot boundary in slots i, i+1, and i+2.

[0330] Figure 21 A PUSCH transmission method of a UE according to an embodiment of the disclosure is illustrated.

[0331] A configured grant PUSCH is a set of resources on which data to be transmitted from a UE to a BS can be transmitted without a separate scheduling DCI when the data occurs. In the configured grant PUSCH, time and frequency resources and transmission information for PUSCH transmission (MCS, RV, etc.) are pre-informed to the UE with a certain periodicity through an upper layer signal or an L1 signal. When performing repetition transmission based on the configured grant PUSCH, repK-RV among the configured grant PUSCH upper layer signal configuration parameters indicates RV values determined according to each resource. repK-RV consists of {0, 2, 3, 1}, {0, 3, 0, 3}, {0, 0, 0, 0}. [Table 10] is related to the case where PUSCH repetition transmission is scheduled by DCI, and is not applied to the configured grant PUSCH. When the repK-RV upper layer signal is not configured, the UE considers all RV values as 0. When the repK-RV upper layer signal is configured, for the configured RV pattern, the {mod(n-1,4)+1}th RV value is applied to the nth configured grant PUSCH in K times of repetition. When the Configuredgrantconfig-StartingfromRV0 upper layer signal is configured as "off", the initial transmission of the corresponding transmission block can be used only in the first resource among the resources repeatedly transmitted K times. Otherwise, the initial transmission of the corresponding transmission block can be changed according to the repK-RV pattern configured by the upper layer signal. For example, when repK-RV = {0, 2, 3, 1}, the initial transmission can be used only in the first transmission among k times of repetition, when repK-RV = {0, 3, 0, 3}, the first transmission can be used in the occasion related to RV = 0 among k times of repetition, and when repK-RV = {0, 0, 0, 0}, the first transmission can be used in all transmission occasions among k times of repetition except for transmission periods thereafter where K is equal to or greater than 8.

[0332] Figure 21A configured grant PUSCH repetition transmission configured as K=8 is shown. K=8 cannot be configured to be larger than P as another higher layer configuration. In case of repK-RV being configured as {0, 3, 0, 3} or {0, 0, 0, 0}, as in Case 1, when traffic occurs before PUSCH i, the UE can start transmission in PUSCH i and can perform a total of 8 repetition transmissions. As in Case 2, when traffic occurs before PUSCH i+4 in the middle of P, the UE can start transmission in PUSCH i+4 and can perform a total of 4 repetition transmissions. If repK-RV is configured as {0, 2, 3, 1} or Configuredgrantconfig-StartingfromRV0 upper signal is configured as "off", when traffic occurs in the middle as in Case 2, the UE cannot perform data transmission in PUSCH i+4, and after that period, the UE can perform configured grant PUSCH repetition transmission from PUSCH i in the next period.

[0333] Hereinafter, techniques and methods for increasing coverage via PUSCH or PUCCH repetition transmission will now be described.

[0334] A BS coverage increase technique is a technique capable of providing data transmission and reception services to a UE in a large range with fewer BSs, and in terms of a BS operator, the BS coverage increase technique requires less cost and thus can be preferable. The BS coverage increase technique includes a repetition transmission or a UE power increase technique, and regarding the UE power increase technique, a maximum power value of a UE cannot be increased due to limitations of implementation and regulations. Therefore, PUSCH or PUCCH repetition transmission of a UE can be considered to increase BS coverage.

[0335] In terms of time domain, a bundling (DMRS time domain bundling) technique between DMRSs of repeatedly transmitted PUSCH and PUCCH can be used to increase coverage. DMRS is a reference signal used to measure a channel for data demodulation / decoding, and when DMRSs transmitted or received at different times or frequencies are bundled (or interpolated / linearly interpolated), more accurate channel estimation can be obtained, so that the demodulation / decoding probability of the receiver can be increased. Therefore, the method of the BS estimating a channel by DMRS bundling of each of the repeatedly transmitted PUSCH and PUCCH and then transmitting data can increase the BS coverage. In this regard, when the transmission power of the repeatedly transmitted PUSCH and PUCCH varies, the DMRS is also transmitted to the BS with different power, so that it can be difficult for the BS to estimate an accurate channel by properly compensating for the difference. Therefore, when the BS (or receiver) performs DMRS time domain bundling, the UE (or transmitter) must ensure the same transmission power of the repeatedly transmitted PUSCH or PUCCH. To this end, according to an embodiment of the present disclosure, a method of transmitting a physical uplink shared channel (PUSCH) by a user equipment (UE) includes: identifying whether demodulation reference signal (DMRS) time domain bundling information is included in a radio resource control (RRC) message received from a base station; determining whether at least one PUSCH is transmitted with the same transmission power within at least one transmission time domain window based on a result of the identification; in response to determining that the at least one PUSCH is transmitted with the same transmission power within the at least one transmission time domain window, determining a transmission power for the at least one PUSCH; and transmitting the at least one PUSCH with the determined transmission power.

[0336] In an embodiment of the present disclosure, the RRC message can include information on at least one transmission time domain window.

[0337] In an embodiment of the present disclosure, the information on at least one transmission time domain window can be indicated by at least one unit of a slot or a symbol.

[0338] In an embodiment of the present disclosure, the at least one PUSCH can include at least one PUSCH repetition transmission configured by the base station.

[0339] In an embodiment of the present disclosure, determining a transmission power for the at least one PUSCH can include: determining that at least one PUSCH belonging to a first transmission time domain window has a first transmission power; and determining that at least one PUSCH belonging to a second transmission time domain window has a second transmission power, wherein the first transmission power is different from the second transmission power.

[0340] In embodiments of this disclosure, determining the transmit power for at least one PUSCH may include: allocating transmit power to at least one PUSCH prior to at least one of the following: a single PUSCH or Physical Uplink Control Channel (PUCCH) transmission; repeated transmission of a PUSCH or PUCCH not time-domain bound to DMRS; PUSCH or PUCCH transmission including Channel State Information (CSI) information; PUCCH transmission including Hybrid Automatic Repeat Request (HARQ)-ACK, Scheduling Request (SR), or Link Recovery Request (LRR) information; PUSCH transmission including HARQ-ACK information; PUSCH transmission without HARQ-ACK or CSI; PUSCH transmission for a Type 2 random access procedure; PUSCH transmission from a Pcell; Sounding Reference Signal (SRS) transmission; or Physical Random Access Channel (PRACH) transmission from another serving cell other than the Pcell.

[0341] In embodiments of this disclosure, the method may further include transmitting to the base station UE capability information regarding whether DMRS time-domain binding is supported.

[0342] To implement the above embodiments, at least one or a combination of the following methods can be used. In the following text, PUSCH (or PUCCH) can be a periodic resource scheduled by DCI or pre-configured by an upper-layer signal without DCI.

[0343] Method 1: For all repeatedly emitted PUSCHs, consider one PUSCH timing i

[0344] As described with reference to [Equation 4], the PUSCH transmit power is determined for each of the PUSCH transmit opportunities. (Referring to...) Figure 20 In the case of PUSCH repetition type A, the transmit power is determined for each of the repeatedly transmitted PUSCHs, and in the case of PUSCH repetition type B, the transmit power is determined in units of nominal PUSCH repetitions. According to method 1, when an upper-layer signal associated with DMRS time-domain bundling is configured or DMRS time-domain bundling is indicated by an L1 signal, the UE considers all PUSCH repetitions transmitted or received according to PUSCH repetition type A or B as a single timing event, i.e., one PUSCH transmission timing event. Therefore, the transmit power of the repeatedly transmitted PUSCHs is fixed to the same value. Figure 20For an example of PUSCH repetition Type A in, in the case of repeated transmissions of PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3, when the upper layer signal associated with DMRS time bundling is configured or DMRS time bundling is indicated by the L1 signal, the UE considers the repeatedly transmitted PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 as one PUSCH transmission occasion and thus determines the transmission power according to [Equation 4] or [Equation 4-1]. When PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 are not considered as one PUSCH transmission occasion, the UE determines the transmission power of each of PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 according to [Equation 4] or [Equation 4-1]. In summary, through the upper layer signal or the L1 signal, the occasion in which the UE determines the transmission power can be a single PUSCH period or a period of all repeatedly transmitted PUSCHs.

[0345] Method 2: The UE applies the transmission power of one PUSCH equally to all PUSCHs to be transmitted thereafter, which is determined in the first transmission period among all repeatedly transmitted PUSCHs.

[0346] When the upper layer signal indicating DMRS time bundling is not configured or the DMRS time bundling indication of the L1 signal is not present, different transmission powers can be determined for the respective PUSCH transmission occasions (or time points) that are repeatedly transmitted, but when the upper layer signal indicating DMRS time bundling is configured or DMRS time bundling is indicated by the L1 signal, the UE can apply the transmission power of the first transmitted PUSCH equally to the PUSCHs to be transmitted thereafter in the repeated transmission. As an example of PUSCH repetition Type A in, the transmission power determined in PUSCH i is applied equally to PUSCH i+1, PUSCH i+2, and PUSCH i+3. That is, when determining the transmission power of PUSCH i+1, PUSCH i+2, and PUSCH i+3, PL Figure 20 For an example of PUSCH repetition Type A in, in the case of repeated transmissions of PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3, when the upper layer signal associated with DMRS time bundling is configured or DMRS time bundling is indicated by the L1 signal, the UE considers the repeatedly transmitted PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 as one PUSCH transmission occasion and thus determines the transmission power according to [Equation 4] or [Equation 4-1]. When PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 are not considered as one PUSCH transmission occasion, the UE determines the transmission power of each of PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3 according to [Equation 4] or [Equation 4-1]. In summary, through the upper layer signal or the L1 signal, the occasion in which the UE determines the transmission power can be a single PUSCH period or a period of all repeatedly transmitted PUSCHs. b，f，c (qd) and f b，f，c is applied as the same value as that of PUSCH i. In other words, when f b，f，c is the accumulation mode or the absolute mode, f b，f，cTPC commands attached, and the UE can ignore the TPC commands when determining the transmit power of PUSCH i+1, PUSCH i+2, and PUSCH i+3. However, the ignored TPC commands are effectively applied to another PUSCH transmit power immediately after the repeated transmission. This will now be described with reference to Figure 22 This is described in detail.

[0347] Figure 22 A diagram for describing a method of ensuring the same transmit power of a PUSCH repeatedly transmitted by a UE or a transmitter is shown. In the case where another PUSCH k is configured to be transmitted or received in advance, when PUSCH i, i+1, i+2, and i+3 are configured to be repeatedly transmitted, a TPC accumulation period to determine the transmit power of the configured grant PUSCH k can vary according to whether there is DMRS time bundling.

[0348] In detail, when DMRS time bundling is not performed on PUSCH i, i+1, i+2, and i+3, the transmit power is determined for each of PUSCH i, i+1, i+2, and i+3, and thus, the TPC accumulation period with respect to PUSCH k can be the same as Case 1. Thus, when the TPC command transmitted or received between PUSCH i+1 and PUSCH i+2 is not included in the TPC accumulation period of Case 1, the UE can not consider the TPC command.

[0349] On the other hand, when the UE performs DMRS time bundling according to Method 2, the transmit power of PUSCH i+1, i+2, and i+3 is equal to the transmit power of PUSCH i, and thus, the TPC command transmitted or received between PUSCH i+1 and PUSCH i+2 is not considered for the transmit power of PUSCH i+2 and i+3, but can be considered for the transmit power of PUSCH k. Thus, the TPC accumulation period with respect to PUSCH k can be the same as in Case 2. PUSCH k can be a scheduled PUSCH, and the offset value of PUSCH k can be the last symbol of the PDCCH to which the DCI for scheduling PUSCH k belongs. The offset value is a PUSCH preparation time, and can have different lengths of time according to a subcarrier spacing or a UE processing capability.

[0350] In [Equation 4], P 0_PUSCH，b，f，c (j) Δ TF，b，f，c(i) has a constant value with respect to a PUSCH that is always repeatedly transmitted without separate assumption (e.g., configuration of an upper layer signal or indication of an L1 signal). In an embodiment of the disclosure, according to Method 2, the first transmission period in the repeatedly transmitted PUSCH can be the first PUSCH resource in the actually transmitted PUSCH. In another embodiment of the disclosure, the first PUSCH resource in the PUSCH can be the first PUSCH resource in the PUSCH including a PUSCH whose transmission is canceled by DCI such as a slot format indicator (SFI) or an uplink cancellation indication (UL CI).

[0351] In more detail, as an example, when, in PUSCH repetition Type A or Type B, the transmission of PUSCH i is canceled by UL CI or SFI, the UE can not actually transmit PUSCH i, or can only transmit a front portion of PUSCH i and then can cancel the transmission. In this case, the UE needs to determine the reference PUSCH transmission occasion for DMRS time domain bundling during the repeated transmissions of PUSCH i, PUSCH i+1, PUSCH i+2, and PUSCH i+3. Figure 20

[0352] The first transmission period in the repeatedly transmitted PUSCH can indicate the first PUSCH resource in the actually transmitted PUSCH. Therefore, in the above case, the entire PUSCH i is not transmitted, and thus PUSCH i is considered to have actually been transmitted, and PUSCH i+1 can be considered to be the first PUSCH in the repeatedly transmitted PUSCH. Therefore, the transmission power of PUSCH i+2 and PUSCH i+3 can correspond to PUSCH i+1.

[0353] In another embodiment of the disclosure, the first PUSCH resource in the PUSCH including a PUSCH whose transmission is canceled by DCI such as SFI or UL CI can be, for example, PUSCH i. That is, even when the occasion transmission of PUSCH i is canceled in whole or in part, the transmission power of PUSCH i+1, i+2, and i+3 can correspond to PUSCH i.

[0354] Method 3: In the case of a repeatedly transmitted or received configured grant PUSCH, configure a reference transmission period for DMRS time domain bundling.

[0355] As a reference to the above-mentioned methods, the following is described. Figure 21 ​According to the pre-configured RV pattern, there can be various PUSCH transmission points at which the UE can start the configured grant PUSCH. For example, when the RV pattern is all configured as 0, the UE can perform the PUSCH repetition transmission starting in PUSCH i or PUSCH i+4 according to the occurrence of traffic to be transmitted via the UL. When the BS performs DMRS time-domain bundling via the PUSCH repetition transmission, the UE can have to maintain the same transmission power regardless of the time at which the UE receives the PUSCH. When the PUSCH is indicated by the scheduling DCI, the transmission power determined in the first PUSCH is maintained as the transmission power of the PUSCH to be repeatedly transmitted thereafter.

[0356] When the PUSCH is not indicated by the scheduling DCI, that is, when the PUSCH is a configured grant (CG) PUSCH, the first PUSCH transmission time can vary according to the time of occurrence of traffic in the UE and the configuration of the RV pattern. Accordingly, the UE can set the time at which to determine the transmission power of the configured grant PUSCH repetition to the time at which the actual repetition transmission starts, or can determine the transmission power in the first configured grant PUSCH resource in the pre-configured configured grant period without considering the time at which the actual repetition transmission starts.

[0357] According to a further description with reference to the case in which the UE sets the time at which to determine the transmission power of the configured grant PUSCH repetition to the time at which the actual repetition transmission starts Figure 21 , the UE can start the repetition transmission of the configured grant PUSCH in PUSCH i or PUSCH i+4 according to whether traffic occurs. Here, this means that the transmission power is determined based on PUSCH i or PUSCH i+4. For example, when a TPC command is transmitted or received between PUSCH i+1 and PUSCH i+2, the UE can determine the transmission power in PUSCH i+4 by referring to the TPC command, and can not refer to the TPC command in PUSCH i.

[0358] According to the reference Figure 21Further description on determining the transmission power in the first configured grant PUSCH resource without considering the time when the actual repetition transmission starts in the pre-configured configured grant period, the UE does not consider the time when the actual repetition transmission starts, i.e., the repetition transmission of the configured grant PUSCH starts in PUSCH i or PUSCH i+4 according to the occurrence time of the traffic, but can use the transmission power determined in PUSCH i which is the first transmission occasion within the period of the configured grant PUSCH. Therefore, in the case that the TPC command is transmitted or received between PUSCH i+1 and PUSCH i+2, even when the UE starts the repetition transmission in the configured grant PUSCH i+4, the UE can ignore the TPC command since the transmission power is based on PUSCH i.

[0359] The above describes in detail the methods 1 to 3 of the UE fixing the same transmission power for the PUSCH (or PUCCH) repetition transmission with respect to the DMRS time domain bundling.

[0360] However, when the number of the repeatedly transmitted PUSCH (or PUCCH) is large, such as 100 or 1000, or when the time interval between the repeatedly transmitted PUSCH (or PUCCH) is large, there can be no further enhancement of the channel estimation accuracy via the DMRS time domain bundling by the BS. In addition, this situation can cause a delay in the decoding time of the BS to decode the data.

[0361] The BS can divide the repeatedly transmitted PUSCH (or PUCCH) into subsets and can perform DMRS time domain bundling. Accordingly, the UE does not determine the same transmission power for all of the repeatedly transmitted PUSCH (or PUCCH) according to the aforementioned methods 1 to 3, but can determine the same transmission power for only some of the repeatedly transmitted PUSCH (or PUCCH). In detail, in the case where the PUSCH is repeatedly transmitted 100 times (PUSCH 1, PUSCH 2, …, PUSCH 100) and the DMRS time domain bundling unit is 10 PUSCHs (or PUCCHs) (B = 10), the UE can set PUSCH 1 to PUSCH 10 to have the same transmission power, set PUSCH 11 to PUSCH 20 to have the same transmission power, …, set PUSCH 91 to PUSCH 100 to have the same transmission power. B is a transmission power determination unit for the PUSCH for DMRS time domain bundling, and can be determined by an upper layer signal, an L1 signal, or a combination thereof. That is, the value of B can be determined by an upper layer signal such as SIB, RRC, or MAC CE, or can be determined by an L1 signal such as a DCI field. In another embodiment of the disclosure, the value of B can vary according to the number of times of PUSCH repetitive transmission. For example, the value of B can vary according to the number of times of PUSCH repetitive transmission in the following manner: when the number of times of PUSCH repetitive transmission is between 1 and 10, B = 1, and when the number of times of PUSCH repetitive transmission is between 11 and 20, B = 2. According to method 1, PUSCH 1 to PUSCH 10 can be one PUSCH transmission power determination unit, and according to method 2, the transmission power of PUSCH 1 to PUSCH 10 can be determined as the transmission power of PUSCH 1. This can be expressed as [Equation 4-2]. [Equation 4-2] indicates that the PUSCH transmission power determination unit for DMRS time domain bundling is determined as B PUSCHs.

[0362] [Equation 4-2]

[0363] for a PUSCH transmission occasion i,

[0364]

[0365] In the example described in detail above, the subgroups are generated based on PUSCH transmission occasions. However, the subgroups can be generated in units of time regardless of the PUSCH transmission occasions. For example, in the case where PUSCH is repeatedly transmitted 100 times (PUSCH 1, PUSCH 2, …, PUSCH 100), when PUSCH 1 to 4 are included in a first transmission time domain window T1, the corresponding PUSCHs can have the same transmission power, and when PUSCH 5 and 6 are included in a second transmission time domain window T2, the corresponding PUSCHs can have the same transmission power. In general, PUSCH i to PUSCH k are included in an nth transmission time domain window Tn. By using the above-described method, the transmission time domain windows can have different PUSCH transmissions, respectively. The transmission time domain window Tn can be determined as a value of B by an upper layer signal or an L1 signal, and can have one specific value or can be a set of various values. The unit of the transmission time domain window can be the number of all slots, the number of slots in UL, the number of slots, or an absolute time unit such as ms.

[0366] To support DMRS time domain bundling, there can be a separate UE capability. The legacy DMRS or PUSCH / PUCCH repetition transmission UE capability can include information on DMRS time domain bundling as an additional element. In addition, there can be a UE common or UE specific upper layer signal for DMRS time domain bundling, and the legacy upper layer signal configuration information (e.g., an upper layer signal related to DMRS or PUSCH / PUCCH transmission) can include DMRS bundling information. In addition, an example of an L1 signal for DMRS time domain bundling can include a DCI field or an RNTI. In detail, a 1-bit of a DCI field for indicating DMRS time domain bundling is 0, the DCI field can indicate DMRS time domain bundling as "off", and when the 1-bit is 1, the DCI field can indicate DMRS time domain bundling as "on". The DCI field can be configured by an upper layer signal, or in response to DCI size alignment, the DCI field can be additionally generated without separate configuration of the upper layer signal. The fact that the transmission power is determined based on a specific transmission occasion can mean that the transmission power parameters considered in the specific transmission occasion are used identically. In detail, this can mean that all parameters of [Equation 4] are used identically.

[0367] In another embodiment of the disclosure, when DMRS time domain bundling is notified through an upper layer signal or an L1 signal, the UE can determine the transmission power of the repeatedly transmitted PUSCHk or PUCCHk by using the following [Equation 5]. k refers to the k-th PUSCH or PUCCH repetition transmission occasion, and in the case of a total of N times of repetition transmission, k = {0, 1, 2, …, N-1} and ik is i0< i1< … < iN-1.

[0368] PUSCHi0or PUCCHi0may be the start of the first repeated PUSCH (or PUCCH) transmission, or can be the start of the first PUSCH (or PUCCH) in the repetition period configured by the upper layer signaling in the configured grant PUSCH (or PUCCH) repeated transmission.

[0369] When the DMRS time domain bundling is informed by upper layer signaling or L1 signaling, the UE can assume that all reference signals used for calculating path loss with respect to the repeatedly transmitted PUSCH k or PUCCH k are the same. In another embodiment of the disclosure, when the DMRS time domain bundling is not informed to the UE by upper layer signaling or L1 signaling, the UE can determine the transmit power independently with respect to the repeatedly transmitted PUSCH k or PUCCH k according to [Equation 4], and the determined transmit power values of the corresponding PUSCH or PUCCH can be different or the same.

[0370] [Equation 5]

[0371] P PUSCH (i k , j, q d , l) = P PUSCH (i0, j, q d , l) [dBm]

[0372] In addition to [Equation 5], the UE can also assume that the j, q d or l values used for the determined transmit power in the i0occasion are identically used for the i k occasion. Using the same j can mean that the determination of and α b，f，c (j) in [Equation 4] for the i0occasion is applied to the i k occasion. Using the same q d can mean that the determination of PL b，f，c (q d ) in [Equation 4] for the i0occasion is applied to the i k occasion. Using the same l can mean that the determination of f b，f，c (i, l) in [Equation 4] for the i0occasion is applied to the i kTiming. In another embodiment of the disclosure, when the UE repeatedly transmits PUSCH (or PUCCH) for DMRS time bundling, the UE can consider that beam-related information or transmission power determination-related information will not change. When the beam-related information or the transmission power determination-related information changes the transmission power of the repeatedly transmitted PUSCH or PUCCH, the UE can follow the transmission power of the first-transmitted PUSCH or PUCCH among the repeatedly transmitted PUSCH or PUCCH.

[0373] For example, the beam-related information can indicate specific information indicated by an SRS resource indication (SRI) field indicating a specific SRS resource used for determining α b，f，c (j) or PL b，f，c (q d ) of the SRS resource.

[0374] For example, the transmission power determination-related information can be a TPC command used for determining f b，f，c (i, l) in [Equation 4].

[0375] When DMRS time bundling is signaled through an upper layer signal or an L1 signal and the repeatedly transmitted PUSCH performs frequency hopping, the BS can perform DMRS time bundling with respect to each PUSCH transmitted from each hop of the UE. This will be described in detail with reference to Figure 25 .

[0376] Figure 23 A flowchart showing the operation of a UE supporting DMRS time bundling is shown.

[0377] In operation 2300, the UE can determine to perform DMRS time bundling. In more detail, the UE can report a UE capability supporting DMRS time bundling to the BS. Only for the UE reporting the capability, the BS can signal an upper layer signal or an L1 signal indicating DMRS time bundling to the UE. The UE can perform DMRS time bundling through the upper layer signal or the L1 signal indicating DMRS time bundling signaled by the BS. In another embodiment of the disclosure, regardless of the report of the UE capability, the BS can signal an upper layer signal or an L1 signal indicating DMRS time bundling to the UE.

[0378] The upper layer signal can be in the form of information of SIB, RRC, or MAC CE. In the case of RRC, a separate independent RRC parameter exists or is associated with an existing RRC parameter, so that it can be determined whether to activate DMRS time domain bundling. For example, when a repetition transmission mode is configured, DMRS time domain bundling information can be notified together with whether to activate DMRS time domain bundling. The L1 signal can be in the form of a DCI format, field information in DCI, an RNTI scrambled with a CRC, UE PDCCH search information (search space set or CORESET), or the like. For example, a time resource allocation field of a DCI field can include a start point corresponding to a PUSCH, DMRS mapping information, information such as the number of repetition transmissions, or information indicating the presence or absence of DMRS time domain bundling.

[0379] [Table 12] shows an example of a time resource allocation field. [Table 12] can include a slot offset according to a specific index value, a start and length indication value (SLIV) indicating a start time and a length, S and L information, a PUSCH mapping type, the number of repetition transmissions, or information indicating the presence or absence of DMRS time domain bundling.

[0380] [Table 12]

[0381]

[0382] In operation 2310, the transmission power can be determined to be the same as in the PUSCH repetition transmission. The reference PUSCH transmission occasion can be a PUSCH transmission occasion in which the PUSCH repetition transmission is started, or can be a predetermined PUSCH transmission occasion. In another embodiment of the disclosure, the UE can regard the PUSCH repeatedly transmitted as one unit for determining the transmission power.

[0383] Figure 24 A flowchart for determining a transmission power priority order of a UE in a multi-carrier case is shown.

[0384] In operation 2400, when a carrier group is configured or two UL carriers are configured with one DL carrier, the UE can be scheduled for PUSCH, PUCCH, PRACH, or SRS transmission with respect to a plurality of UL carriers.

[0385] In operation 2410, the UE can compare the sum of the transmission powers of the PUSCH, the PUCCH, the PRACH, or the SRS with a maximum value supported by the UE. In more detail, when the sum of the transmission powers of the PUSCH, the PUCCH, the PRACH, or the SRS scheduled on each carrier with respect to a specific transmission occasion i of the UE exceeds a maximum value (Pc,max) that the UE can support, the UE can not be able to perform all of the corresponding UL transmissions scheduled. Accordingly, in order to prepare for such a situation, it is necessary to set a priority order of allocating transmission power.

[0386] In operation 2420, the UE can allocate the transmission power of the PUSCH, the PUCCH, the PRACH, or the SRS based on the set priority order. The priority order can be set as follows:

[0387] - PRACH transmission from a primary cell (Pcell);

[0388] - PUCCH or PUSCH transmission with a high priority order index;

[0389] - PUCCH or PUSCH transmission regarding the same priority order;

[0390] - PUCCH transmission including HARQ-ACK, SR, or LRR information, or PUSCH transmission including HARQ-ACK information;

[0391] - PUCCH or PUSCH transmission including CSI information;

[0392] - PUSCH transmission without HARQ-ACK or CSI, PUSCH transmission for a type-2 random access procedure, PUSCH transmission from the Pcell; and / or

[0393] - SRS transmission or PRACH transmission from another serving cell other than the Pcell.

[0394] As described with reference to Figure 23 , when the BS informs the UE of DMRS time domain bundling through an upper layer signal or an L1 signal, the UE can consider PUSCH or PUCCH repetition transmission associated with DMRS time domain bundling under the priority order condition. When the UE drops some of the PUSCH or PUCCH repetition transmissions bundled by DMRS time domain bundling according to the priority order, the BS is not aware of the dropping situation, so that degradation of channel estimation performance can occur. Accordingly, the transmission power can be allocated to the PUSCH or PUCCH repetition transmission bundled by DMRS time domain bundling in preference to at least one of the following:

[0395] - single PUSCH or PUCCH transmission;

[0396] - PUSCH or PUCCH repetition transmission not bundled with DMRS in time domain;

[0397] - PUCCH or PUSCH transmission including CSI information;

[0398] - PUCCH transmission including HARQ-ACK, SR, or LRR information, or PUSCH transmission including HARQ-ACK information;

[0399] - PUCCH or PUSCH transmission including CSI information;

[0400] - PUSCH transmission without HARQ-ACK or CSI, PUSCH transmission for Type-2 random access procedure, PUSCH transmission from Pcell; or

[0401] - SRS transmission or PRACH transmission from another serving cell except for Pcell.

[0402] Figure 25 A diagram for describing a method of a UE determining a PUSCH transmission power is illustrated.

[0403] When a PUSCH repeatedly transmitted by being notified of DMRS time bundling through an upper layer signal or an L1 signal performs frequency hopping, a BS can perform DMRS time bundling with respect to each of the PUSCHs transmitted from each hop of the UE.

[0404] Frequency hopping is a scheme of obtaining frequency diversity, and can enhance reliability of a UE transmission or increase coverage. When a UE repeatedly transmits PUSCH i, i+1, i+2, and i+3, as shown in Figure 25 When PUSCH i and PUSCH i+2 are located at hop 1 and PUSCH i+1 and PUSCH i+3 are located at hop 2 with respect to frequency, the BS can perform time bundling with respect to DMRS repeatedly transmitted from PUSCH i and PUSCH i+2, and can perform time bundling with respect to DMRS respectively transmitted in PUSCH i+1 and PUSCH i+3. Accordingly, in the case of frequency hopping, the PUSCH repetition transmission can be the same at each hop, or different transmission powers can be determined for each hop. Accordingly, when frequency hopping is notified through an upper layer signal or an L1 signal, the UE can determine a transmission power of a PUSCH by using [Equation 6].

[0405] [Equation 6]

[0406]

[0407]

[0408] wherein

[0409] In [equation 6], N refers to the number of repetitions. [Equation 6] can indicate that the transmission power determined in the transmission occasion of the first transmitted PUSCH in each hop can be used for another PUSCH repeatedly transmitted in each hop in the case of PUSCH repetition transmission and DMRS time domain bundling with frequency hopping. [Equation 6] can be equally applied to PUCCH frequency hopping.

[0410] Figure 26 A structure of a UE according to an embodiment of the disclosure is shown.

[0411] Referring to Figure 26 , the UE can include a processor 2601, a transceiver 2602, and a memory 2603. In the disclosure, the processor can be defined as a circuit, an application-specific integrated circuit, or at least one processor.

[0412] The processor 2601 according to an embodiment of the disclosure can control the overall operation of the UE. For example, the processor 2601 can control the signal flow between blocks in order to perform operations according to the flowcharts described above. In addition, the processor 2601 can record data to and read data from the memory 2603. The processor 2601 can perform the functions of the protocol stack requested by the communication rule. To this end, the processor 2601 can include at least one processor or microprocessor. Alternatively, the processor 2601 can be a part of a multi-processor. In addition, the transceiver 2602 and a part of the processor 2601 can be referred to as a communication processor (CP).

[0413] According to an embodiment of the disclosure, the processor 2601 can control the reference Figures 1 to 18 described operations.

[0414] The processor 2601 according to an embodiment of the disclosure can perform the UL transmission power control method, and thus, when the UE receives one or more DCIs from one or more cells in a system to which CA is applied, the processor 2601 can ensure UL performance by accumulating the values of the transmission power control parameters obtained from the DCIs and can minimize interference to adjacent cells.

[0415] The transceiver 2602 according to an embodiment of the disclosure can perform a function of transmitting and receiving a signal through a wireless channel. For example, the transceiver 2602 can perform conversion between a baseband signal and a bit string based on a physical layer specification of a system. For example, for data transmission, the transceiver 2602 can generate complex symbols by encoding and modulating a transmission bit string. For data reception, the transceiver 2602 can reconstruct a reception bit string by demodulating and decoding a baseband signal. The transceiver 2602 can up-convert a baseband signal to a radio frequency (RF) band signal and then can transmit the RF band signal through an antenna, and can down-convert an RF band signal received through an antenna to a baseband signal. For example, the transceiver 2602 can include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In addition, the transceiver 2602 can include a plurality of transmission and reception paths. Furthermore, the transceiver 2602 can include at least one antenna array including a plurality of antenna elements. In terms of hardware, the transceiver 2602 can be configured as a digital unit and an analog unit (for example, a radio frequency integrated circuit (RFIC)). Here, the digital unit and the analog unit can be implemented as one package. In addition, the transceiver 2602 can include a plurality of RF chains.

[0416] The memory 2603 according to an embodiment of the disclosure can store a basic program, an application program, and data for operation of the UE, for example, configuration information. The memory 2603 can be configured as a volatile memory, a non-volatile memory, or a combination of the volatile memory and the non-volatile memory. The memory 2603 can provide stored data in response to a request of the processor 2601. The memory 2603 can store at least one of information transmitted or received via the transceiver 2602 or information generated by the processor 2601.

[0417] Figure 27 A structure of a BS according to an embodiment of the disclosure is illustrated.

[0418] Reference Figure 27 The BS can include a processor 2701, a transceiver 2702, and a memory 2703. In the disclosure, the processor can be defined as a circuit, an application-specific integrated circuit, or at least one processor.

[0419] The processor 2701 according to an embodiment of the disclosure can control overall operations of the BS. For example, the processor 2701 can control a signal flow between blocks in order to perform operations according to the flowcharts described above. In addition, the processor 2701 can record and read data to and from the memory 2703. The processor 2701 can perform functions of a protocol stack requested by a communication rule. To this end, the processor 2701 can include at least one processor or microprocessor. Alternatively, the processor 2701 can be a part of a multi-processor. In addition, a part of the transceiver 2702 and the processor 2701 can be referred to as a CP.

[0420] According to an embodiment of the disclosure, the processor 2701 can control a reference Figures 1 to 18 described operations.

[0421] The transceiver 2702 according to an embodiment of the disclosure can perform a function of transmitting and receiving signals over a wireless channel. For example, the transceiver 2702 can perform conversion between a baseband signal and a bit string based on a physical layer specification of a system. For example, for data transmission, the transceiver 2702 can generate complex symbols by encoding and modulating a transmission bit string. For data reception, the transceiver 2702 can reconstruct a reception bit string by demodulating and decoding a baseband signal. The transceiver 2702 can up-convert a baseband signal to an RF band signal and then can transmit the RF band signal through an antenna, and can down-convert an RF band signal received through an antenna to a baseband signal. For example, the transceiver 2702 can include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In addition, the transceiver 2702 can include a plurality of transmission and reception paths. Furthermore, the transceiver 2702 can include at least one antenna array including a plurality of antenna elements. In terms of hardware, the transceiver 2702 can be configured as a digital unit and an analog unit (e.g., an RFIC). Here, the digital unit and the analog unit can be implemented as one package. In addition, the transceiver 2702 can include a plurality of RF chains.

[0422] The memory 2703 according to an embodiment of the disclosure can store basic programs, application programs, and data for operations of the UE, for example, configuration information. The memory 2703 can be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The memory 2703 can provide stored data in response to a request of the processor 2701. The memory 2703 can store at least one of information transmitted or received via the transceiver 2702 or information generated by the processor 2701.

[0423] The method according to an embodiment of the disclosure as described in a claim or a specification can be implemented in hardware, software, or a combination of hardware and software.

[0424] When implemented as software, a computer-readable storage medium storing one or more programs (e.g., software modules) can be provided. The one or more programs stored in the computer-readable storage medium can be configured for execution by one or more processors within the electronic device. The one or more programs include instructions directing the electronic device to execute the methods according to embodiments of the disclosure as described in the claims or the specification.

[0425] The programs (e.g., software modules or software) can be stored in non-volatile memory including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), a magnetic disc storage device, a compact disc (CD)-ROM, a digital versatile disc (DVD), another optical storage device, or a magnetic cassette. Alternatively, the programs can be stored in memory including a combination of some or all of the foregoing storage media. A plurality of such memories can be included.

[0426] In addition, the programs can be stored in an attachable storage device accessible through any one or a combination of communication networks such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), or a storage area network (SAN). Such a storage device can access a device performing embodiments of the disclosure via an external port. Furthermore, a separate storage device on a communication network can access an electronic device performing embodiments of the disclosure.

[0427] In the foregoing embodiments of the disclosure, elements included in the disclosure are expressed in singular or plural form according to embodiments of the disclosure. However, the singular or plural form is appropriately selected for the convenience of explanation, and the disclosure is not limited thereto. Therefore, an element expressed in plural form can also be configured as a single element, and an element expressed in singular form can also be configured as a plurality of elements.

[0428] Although the disclosure has been described with various embodiments, various changes and modifications can be suggested to one skilled in the art. It is intended that the disclosure encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method of transmitting an uplink channel performed by a user equipment (UE), the method comprising: receiving, from a base station, radio resource control (RRC) signaling indicating that demodulation reference signal (DMRS) bundling is enabled and indicating a physical uplink shared channel (PUSCH) repetition type; identifying, based on the RRC signaling, at least one nominal time domain window (TDW) for transmitting at least one PUSCH; identifying whether frequency hopping is performed; in a case where the frequency hopping is not performed, determining a starting symbol of a first PUSCH as a starting symbol of at least one actual TDW and a last symbol of a second PUSCH as a last symbol of the at least one actual TDW; in a case where the frequency hopping is performed, determining a starting symbol of a third PUSCH located at a first hop as a starting symbol of the at least one actual TDW and a last symbol of a fourth PUSCH located at the first hop as a last symbol of the at least one actual TDW; wherein the first PUSCH is located before the second PUSCH in time domain, wherein the third PUSCH is located before the fourth PUSCH in time domain, wherein each of the first, second, third, and fourth PUSCHs is included in a slot of the at least one PUSCH transmission; and wherein the at least one nominal TDW includes the at least one actual TDW; and maintaining power consistency within a same actual TDW for the at least one PUSCH transmission. 2.The method of claim 1, further comprising: transmitting, to the base station, UE capability information on whether DMRS bundling is supported. 3.The method of claim 1, wherein the at least one PUSCH is repeatedly transmitted; and wherein at least one starting symbol or at least one length of the at least one PUSCH is the same or different from each other. 4.A user equipment (UE) for transmitting an uplink channel, the UE comprising: at least one transceiver; at least one processor communicatively connected with the at least one transceiver; and at least one memory communicatively connected with the at least one processor and storing instructions executable by the at least one processor alone or in any combination to cause the UE to: receive, from a base station, radio resource control (RRC) signaling indicating that demodulation reference signal (DMRS) bundling is enabled and indicating a physical uplink shared channel (PUSCH) repetition type; identify, based on the RRC signaling, at least one nominal time domain window (TDW) for transmitting at least one PUSCH; identify whether frequency hopping is performed; in a case where the frequency hopping is not performed, determine a starting symbol of a first PUSCH as a starting symbol of at least one actual TDW and a last symbol of a second PUSCH as a last symbol of the at least one actual TDW; ​ wherein, in case no frequency hopping is performed, a starting symbol of a first PUSCH is determined as a starting symbol of the at least one actual TDW and a last symbol of a second PUSCH is determined as a last symbol of the at least one actual TDW, and wherein the first PUSCH is located in time domain before the second PUSCH, wherein the third PUSCH is located in time domain before the fourth PUSCH, wherein each of the first PUSCH, the second PUSCH, the third PUSCH and the fourth PUSCH is included in a slot of the at least one PUSCH transmission; and wherein the at least one nominal TDW comprises the at least one actual TDW; and wherein, for the at least one PUSCH transmission, power consistency is maintained within a same actual TDW.

5. The UE of claim 4, wherein the at least one processor is further configured to: transmit, to the base station, UE capability information on whether DMRS bunding is supported.

6. The UE of claim 4, wherein wherein the at least one PUSCH is repeatedly transmitted; and wherein at least one starting symbol or at least one length of the at least one PUSCH is the same or different from each other.

7. A method of receiving an uplink channel performed by a base station, the method comprising: transmitting, to a user equipment (UE), a radio resource control (RRC) message including demodulation reference signal (DMRS) time domain bundling information; receiving, from the UE, at least one physical uplink shared channel (PUSCH) having at least one actual time domain window (TDW) with consistent power; wherein, in case no frequency hopping is performed, a starting symbol of a first PUSCH is determined as a starting symbol of the at least one actual TDW and a last symbol of a second PUSCH is determined as a last symbol of the at least one actual TDW, and wherein, in case frequency hopping is performed, a starting symbol of a third PUSCH located at a first hop is determined as a starting symbol of the at least one actual TDW and a last symbol of a fourth PUSCH located at the first hop is determined as a last symbol of the at least one actual TDW, wherein the first PUSCH is located in time domain before the second PUSCH; wherein the third PUSCH is located in time domain before the fourth PUSCH; and wherein each of the first PUSCH, the second PUSCH, the third PUSCH and the fourth PUSCH is included in a slot of the at least one PUSCH transmission.

8. The method of claim 7, wherein the at least one PUSCH is repeatedly received.

9. The method of claim 7, wherein at least one starting symbol or at least one length of the at least one PUSCH is the same or different from each other.

10. The method of claim 7, further comprising: receiving, from the UE, UE capability information on whether DMRS bunding is supported. ​

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