METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING HARQ-ACK INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - Patent application

Abstract

A method performed by a terminal according to an embodiment of the present specification includes receiving an SIB, transmitting a random access preamble, receiving a random access response, transmitting a PUSCH, receiving DCI for scheduling a PDSCH, receiving the PDSCH, and transmitting HARQ-ACK information associated with the reception of the PDSCH. The HARQ-ACK information is transmitted based on a repetition of a PUCCH. The DCI includes a Downlink Assignment Index (DAI) field. A repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

Description

[Technical Field]

[0001] The present specification relates to a method and apparatus for transmitting and receiving HARQ-ACK information in a wireless communication system. [Background technology]

[0002] Mobile communication systems were developed to provide voice services while ensuring user activity. However, the scope of mobile communication systems has expanded beyond voice to include data services, and currently, explosive traffic growth is causing resource shortages and users are demanding faster services, so more advanced mobile communication systems are required.

[0003] The requirements for next-generation mobile communication systems are significant: they must be able to accommodate explosive data traffic, dramatically increase the transmission rate per user, accommodate a significantly increased number of connected devices, achieve extremely low end-to-end latency, and be energy efficient. To achieve this, various technologies are being researched, including dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] Meanwhile, standardization discussions have led to the introduction of the following operations:

[0005] For PUCCH repetition associated with HARQ-ACK information for Msg4, the base station can configure multiple repetition factors used in the cell to the terminal. Then, the base station can dynamically indicate the repetition factor required for the terminal via the DAI field of the DCI. Summary of the Invention [Problem to be solved by the invention]

[0006] According to the existing method, the DAI field (2 bits) is used to indicate a downlink assignment index. Therefore, in order to indicate one of the repetition factors set in the UE through the DAI field, a method for interpreting the DAI field needs to be specifically defined. The existing method has the following problems.

[0007] It may be unclear how the UE should interpret the DAI field depending on the number of repetition factors set. For example, it may be unclear which of the following methods 1) to 4) the UE should use to determine the repetition factor.

[0008] 1) Based on the number of repetition factors set, the LSB of the DAI field indicates one of the repetition factors set.

[0009] 2) Based on the number of repeat factors set, the MSB of the DAI field indicates one of the repeat factors set.

[0010] 3) Based on the number of repetition factors set, the LSB and MSB of the DAI field indicate one of the repetition factors set.

[0011] 4) The LSB and MSB of the DAI field indicate one of the set repetition factors.

[0012] Depending on which of the methods 1) to 4) above is used to interpret the DAI field, the repetition factor determined by the UE based on the DAI field and the repetition factor instructed by the base station to be used by the UE may vary. For example, if the repetition factor determined by the UE based on the DAI field is lower than the repetition factor instructed by the base station, HARQ-ACK information may not be correctly transmitted to the base station. For example, if the repetition factor determined by the UE based on the DAI field is higher than the repetition factor instructed by the base station, unnecessary signaling overhead may occur even though HARQ-ACK information has already been transmitted to the base station.

[0013] The purpose of this specification is to propose a method for solving the above-mentioned problems.

[0014] The technical problems to be solved in this specification are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0015] A method performed by a terminal in a wireless communication system according to an embodiment of the present specification includes receiving a system information block (SIB), transmitting a random access preamble, receiving a random access response (RAR), transmitting a physical uplink shared channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), receiving the PDSCH, and transmitting hybrid automatic repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with the reception of the PDSCH.

[0016] The PDSCH includes a contention resolution identity. The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH).

[0017] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0018] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0019] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0020] The code point is determined based on the number of the plurality of repetition factors.

[0021] The DAI field is a 2-bit field, and the first bit may be a most significant bit (MSB) or a least significant bit (LSB) of the DAI field, and the second bit may be a least significant bit (LSB) or an MSB of the DAI field.

[0022] Based on the number of the plurality of repetition factors being two, the code point may be one of two code points based on the first bit or the second bit.

[0023] Each of the two code points may be associated with a respective repeat factor determined based on the order of the multiple repeat factors.

[0024] Based on the number of the plurality of repetition factors being greater than two, the code point may be one of four code points based on the first bit and the second bit.

[0025] Each of the four code points may be associated with a respective repeat factor determined based on the order of the multiple repeat factors.

[0026] The SIB may include a pucch-ResourceCommon parameter.

[0027] The pucch-ResourceCommon parameter may be associated with a PUCCH resource set before dedicated PUCCH resource configuration.

[0028] The PUCCH resource set associated with the PUCCH can be configured based on one row of a table consisting of 16 rows, each of which has 16 PUCCH configurations.

[0029] Among the indexes 0 to 15 representing the 16 rows, the value of the pucch-ResourceCommon parameter may be based on one of the indexes associated with a specific PUCCH format.

[0030] The specific PUCCH format may be PUCCH format 1. The value of the pucch-ResourceCommon parameter may be 11, 12, 13, 14, or 15.

[0031] Each of the PUCCH configurations may include at least one of: i) a PUCCH format; ii) a first symbol; iii) a number of symbols; iv) a physical resource block (PRB) offset; and / or v) a set of initial CS indexes.

[0032] Intra-slot frequency hopping may be applied to the repetition of the PUCCH.

[0033] A terminal operating in a wireless communication system according to another embodiment of the present specification comprises one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations.

[0034] The operations include receiving a System Information Block (SIB), transmitting a Random Access Preamble, receiving a Random Access Response (RAR), transmitting a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, receiving Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), receiving the PDSCH, and transmitting Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with the reception of the PDSCH.

[0035] The PDSCH includes a contention resolution identity. The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH).

[0036] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0037] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0038] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0039] The code point is determined based on the number of the plurality of repetition factors.

[0040] According to yet another embodiment of the present disclosure, an apparatus includes one or more memories and one or more processors operatively coupled to the one or more memories.

[0041] The one or more memories contain instructions that, upon being executed by the one or more processors, configure the one or more processors to perform actions.

[0042] The operations include receiving a System Information Block (SIB), transmitting a Random Access Preamble, receiving a Random Access Response (RAR), transmitting a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, receiving Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), receiving the PDSCH, and transmitting Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with the reception of the PDSCH.

[0043] The PDSCH includes a contention resolution identity. The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH).

[0044] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0045] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0046] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0047] The code point is determined based on the number of the plurality of repetition factors.

[0048] According to yet another embodiment of the present disclosure, one or more non-transitory computer-readable media store one or more instructions.

[0049] One or more instructions executable by one or more processors configure the one or more processors to perform an action.

[0050] The operations include receiving a System Information Block (SIB), transmitting a Random Access Preamble, receiving a Random Access Response (RAR), transmitting a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, receiving Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), receiving the PDSCH, and transmitting Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with the reception of the PDSCH.

[0051] The PDSCH includes a contention resolution identity. The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH).

[0052] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0053] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0054] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0055] The code point is determined based on the number of the plurality of repetition factors.

[0056] According to yet another embodiment of the present specification, a method performed by a base station in a wireless communication system includes the steps of transmitting a System Information Block (SIB), receiving a Random Access Preamble (Random Access Preamble), transmitting a Random Access Response (RAR), receiving a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, transmitting Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), transmitting the PDSCH, and receiving Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with reception of the PDSCH.

[0057] The PDSCH includes a contention resolution identity. The HARQ-ACK information is received based on repetition of a Physical Uplink Control Channel (PUCCH).

[0058] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0059] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0060] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0061] The code point is determined based on the number of the plurality of repetition factors.

[0062] In accordance with yet another embodiment of the present specification, a base station operating in a wireless communication system comprises one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations.

[0063] The operations include transmitting a System Information Block (SIB), receiving a Random Access Preamble (Random Access Preamble), transmitting a Random Access Response (RAR), receiving a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR, transmitting Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), transmitting the PDSCH, and receiving Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information associated with the reception of the PDSCH.

[0064] The PDSCH includes a contention resolution identity. The HARQ-ACK information is received based on repetition of a Physical Uplink Control Channel (PUCCH).

[0065] A plurality of repetition factors are set based on the SIB. The DCI includes a Downlink Assignment Index (DAI) field.

[0066] A repetition factor associated with the PUCCH among the plurality of repetition factors is indicated based on the DAI field.

[0067] The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0068] The code point is determined based on the number of the plurality of repetition factors. [Effects of the Invention]

[0069] According to an embodiment of the present specification, a code point in the DAI field for indicating the repetition factor is determined based on the number of repetition factors.

[0070] Therefore, since one of the set repetition factors is indicated based on an existing field (DAI field) of the DCI, the implementation complexity required for dynamic indication of one of the set repetition factors can be minimized.

[0071] In addition, the problem of ambiguity as to whether the code point of the DAI field indicating the repetition factor on the terminal side is a code point based on the LSB (or MSB) or a code point based on the LSB and MSB (2 bits) can be resolved.

[0072] In addition, due to ambiguity in the interpretation of the DAI field, a problem in which the repetition factor determined by the terminal based on the DAI field differs from the repetition factor instructed by the base station to be used by the terminal can be prevented. Problems in which HARQ-ACK information is not correctly transmitted or unnecessary signaling overhead is caused can be solved.

[0073] In addition, since only one bit of the DAI field can be used to indicate a repetition factor based on the number of set repetition factors, it is possible to minimize cases where the usable DAI is limited. For example, when two bits of the DAI field are used, the DAI usable to indicate a specific repetition factor is limited to one of four indexes (e.g., 11 out of 00, 01, 10, and 11). On the other hand, when only one bit (LSB) of the DAI field is used, two of the four indexes can be used to indicate a specific repetition factor (e.g., 01 or 11 out of 00, 01, 10, and 11).

[0074] The effects that can be obtained in this specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0075] [Figure 1] 1 illustrates the physical channels and general signaling used in 3GPP® systems. [Figure 2] Illustrates the system information (SI) acquisition process. [Figure 3] 1 illustrates a random access procedure. [Figure 4] 1 illustrates frequency hopping in conjunction with repeated transmissions according to embodiments herein. [Figure 5] 1 illustrates frequency hopping in conjunction with repeated transmissions according to embodiments herein. [Figure 6] 1 illustrates frequency hopping in conjunction with repeated transmissions according to embodiments herein. [Figure 7] 1 illustrates frequency hopping in conjunction with repeated transmissions according to embodiments herein. [Figure 8] 1 illustrates frequency hopping in conjunction with repeated transmissions according to embodiments herein. [Figure 9] 10 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present specification. [Figure 10] 10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure. [Figure 11] FIG. 1 is a diagram illustrating the configurations of a first device and a second device according to an embodiment of the present specification. DETAILED DESCRIPTION OF THE INVENTION

[0076] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention can be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those skilled in the art will recognize that the present invention can be practiced without such specific details.

[0077] In some cases, well-known structures and devices may be omitted or shown in block diagram form, focusing on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention.

[0078] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from the terminal to the base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The base station may also be expressed as a first communication device, and the terminal may also be expressed as a second communication device. A base station (BS) may also be replaced with terms such as a fixed station, Node B, evolved-Node B (eNB), Next Generation Node B (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, road side unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), augmented reality (AR) device, and virtual reality (VR) device. In addition, a terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advance Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0079] [NR NTN]

[0080] The use of NR NTN (non-terrestrial network) or LTENTN services is being considered to ensure wider coverage or to provide wireless communication services in places where it is difficult to install wireless communication base stations. While existing TN (terrestrial network) services, such as NR and LTE services, provide wireless communication services to terminals by installing base stations on the ground, NTN services provide wireless communication services to terminals by installing base stations not on the ground, such as on satellites (such as geostationary orbits, low orbits, and medium orbits), airplanes, unmanned airships, and drones. Scenarios such as HAPS (high altitude platform) and ATG (air to ground) are also included.

[0081] Physical Channels and General Signaling

[0082] 1 illustrates physical channels and general signal transmission used in a 3GPP system. In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and transmits information to the base station via an uplink (UL). Information exchanged between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / use of the information exchanged.

[0083] When a terminal is powered on or newly enters a cell, it performs an initial cell search operation, such as synchronizing with a base station (S101). To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Thereafter, the terminal receives a physical broadcast channel (PBCH) from the base station to acquire broadcast information within the cell. Meanwhile, the terminal can receive a downlink reference signal (DLRS) during the initial cell search step to check the downlink channel status.

[0084] After completing the initial cell search, the terminal can acquire more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the information carried on the PDCCH (S102).

[0085] Meanwhile, when the terminal first connects to the base station or when there are no radio resources for signal transmission, the terminal can perform a random access procedure (RACH) with the base station (S103 to S106). To this end, the terminal transmits a specific sequence as a preamble over a physical random access channel (PRACH) (S103 and S105) and can receive a response message (Random Access Response (RAR) message) to the preamble over a PDCCH and a corresponding PDSCH. In the case of a contention-based RACH, the terminal can also perform a contention resolution procedure (S106).

[0086] After performing the above-described procedures, the UE may then perform PDCCH / PDSCH reception (S107) and Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) transmission (S108) as a general uplink / downlink signal transmission procedure. In particular, the UE may receive downlink control information (Downlink Control Information (DCI)) via the PDCCH. Here, the DCI includes control information such as resource allocation information for the UE, and different formats may be applied depending on the purpose of use.

[0087] Meanwhile, control information that a terminal transmits to a base station via an uplink or that the terminal receives from a base station may include a downlink / uplink ACK / NACK signal, a CQI (Channel Quality Indicator), a PMI (Precoding Matrix Index), an RI (Rank Indicator), etc. The terminal may transmit the above-mentioned control information such as the CQI / PMI / RI via a PUSCH and / or a PUCCH.

[0088] SSB (Synchronization Signal Block) transmission and related operations

[0089] FIG. 2 illustrates the system information (SI) acquisition process.

[0090] The UE can acquire AS- / NAS-information through the SI acquisition process. The SI acquisition process can be applied to UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states.

[0091] SI is divided into MIB (Master Information Block) and multiple SIBs (System Information Block). Other SI in MIB can be called RMSI (Remaining Minimum System Information). For more details, please refer to the following.

[0092] The MIB includes information / parameters related to SIB1 (System Information Block 1) reception and is transmitted via the PBCH of the SSB. During initial cell selection, the UE assumes that half-frames having SSBs are repeated at 20 ms intervals. The UE can check whether a CORESET (Control Resource Set) for the Type0-PDCCH common search space exists based on the MIB. The Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit a PDCCH that schedules SI messages. If the Type0-PDCCH common search space exists, the UE can determine (i) the multiple consecutive RBs and one or more consecutive symbols that constitute the CORESET and (ii) the PDCCH opportunity (i.e., the time-domain location for PDCCH reception) based on information in the MIB (e.g., pdcch-ConfigSIB1). If there is no Type0-PDCCH common search space, pdcch-ConfigSIB1 provides information about the frequency location where SSB / SIB1 exists and the frequency range where SSB / SIB1 does not exist.

[0093] SIB1 includes information related to the availability and scheduling (e.g., transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, where x is an integer equal to or greater than 1). For example, SIB1 may indicate whether SIBx is broadcast periodically or provided at the request of a terminal in an on-demand manner. If SIBx is provided in an on-demand manner, SIB1 may include information necessary for a terminal to request SI. SIB1 is transmitted via a PDSCH, and a PDCCH scheduling SIB1 is transmitted via a Type0-PDCCH common search space, and SIB1 is transmitted via a PDSCH indicated by the PDCCH.

[0094] The SIBx are contained in SI messages and transmitted over the PDSCH. Each SI message is transmitted within a periodically occurring time window (i.e., SI-window).

[0095] FIG. 3 illustrates a random access procedure.

[0096] FIG. 3(a) shows a contention-based RACH procedure, and FIG. 3(b) shows a contention-free RACH procedure.

[0097] The following describes MSG1 transmission.

[0098] The subcarrier spacing for MSG1 is set in the RACH configuration and is provided in the handover command for a contention-free RA procedure for handover.

[0099] The preamble indexes for contention based random access (CBRA) and contention free random access (CFRA) are mapped consecutively to one SSB in one RACH transmission opportunity.

[0100] CBRA: Within an SS burst set, the association between an SS block (SSB) and a subset of RACH resources and / or preamble indexes is set by a parameter set in RMSI.

[0101] CFRA: The UE can be configured to transmit multiple MSG1s via dedicated multiple RACH transmission opportunities in the time domain before the end of the monitored RAR window.

[0102] The association between the CFRA preamble and the SSB is then re-established via UE-specific RRC.

[0103] The random access procedure may be a Type-1 random access procedure (4-step RA) or a Type-2 random access procedure (2-step RA).

[0104] The Type-1 random access procedure can include transmitting a random access preamble (Msg1) on a physical random access channel (PRACH), receiving a random access response (RAR) (Msg2), transmitting a PUSCH scheduled by a UL grant of the RAR (Msg3), and transmitting a PDSCH (Msg4) for contention resolution. If the random access procedure is contention-free random access (CFRA), the operations of transmitting Msg3 and receiving Msg4 are omitted.

[0105] The Type-2 random access procedure may include transmitting a random access preamble and a PUSCH (MsgA) and receiving an RAR (MsgB).

[0106] Table 1 below illustrates the operations associated with the random access procedure.

[0107] [Table 1]

[0108] The settings / definitions / operations according to Table 1 may be referred to in order to clarify the definitions / operations of the following embodiments. For example, Msg4 HARQ-ACK may refer to the HARQ-ACK information in Table 1.

[0109] The above content can be applied in combination with the methods, etc. proposed in this specification described later, or can be supplemented to clarify the technical features of the methods, etc. proposed in this specification.

[0110] If a terminal in the initial access step successfully receives the Mg.4 PDSCH transmitted from the base station during the RACH procedure, it transmits HARQ-ACK information (see Table 1). At this time, resources required for the terminal to transmit the PUCCH for Mg.4 HARQ-ACK are predefined as an initial PUCCH resource set. The base station can select one of the defined initial PUCCH resource sets. Specifically, the base station can configure / instruct the terminal to select one of the initial PUCCH resource sets via RRC signaling. The base station then instructs the terminal to select one PUCCH resource from the instructed PUCCH resource set. Specifically, the base station instructs the terminal to select the PUCCH resource based on a specific field of the DCI scheduling the Mg.4 PDSCH and the CCE index of the DCI. The initial PUCCH resource set used at this time is defined in Table 2 below.

[0111] [Table 2]

[0112] Meanwhile, signals / channels considered in the existing NR system may not meet the target SNR in certain environments (e.g., NTN) and may not operate normally. In particular, an enhancement such as repeated transmission of the PUCCH format defined in the initial PUCCH resource set may be required in an NTN environment. This specification proposes a method to be considered when repeated transmission is applied to the PUCCH format (defined in the initial PUCCH resource set).

[0113] Method for setting the number of repetitions of the initial PUCCH resource set

[0114] [Proposed method 1]

[0115] The base station can configure / instruct the terminal to configure / instruct a set of multiple (e.g., K) repetition numbers (applicable to the initial PUCCH resource set) via higher layer signaling (e.g., SIB, etc.). The base station can actually configure / instruct the terminal to configure / instruct the repetition numbers via another indication method (e.g., DCI, etc.). The proposed method will now be described in detail.

[0116] The base station can configure a set of K repetition numbers that the initial PUCCH resource set can have, along with a parameter (e.g., pucch-ResourceCommon) that determines the index of the initial PUCCH resource set, to the terminal via higher layer signaling (e.g., SIB, etc.). Then, the base station can configure / indicate to the terminal the repetition number that will actually be applied / used to the initial PUCCH resource set via a specific field (e.g., Downlink Assignment Index (DAI) field) of DCI that schedules Msg.4 PDSCH.

[0117] For example, to select one of the K repetitions, the L bit of the DCI is JPEG2025532231000004.jpg9148 may be used to set / indicate a PUCCH repetition number. For example, a portion of the most significant bit field of the MCS field of the DCI may be used to set / indicate a PUCCH repetition number.

[0118] For example, the repetition number for which the initial PUCCH resource set is used / applied may be set / indicated based on the Mg.4 PDSCH, not the DCI that schedules the Mg.4 PDSCH. In other words, the Mg.4 PDSCH may include information about the repetition number.

[0119] As an example, the repetition number used / applied to the initial PUCCH resource set can be configured / indicated to the terminal via the PDSCH on which Msg.2 RAR is transmitted or the DCI scheduling the PDSCH on which Msg.2 RAR is transmitted.

[0120] In this case, the number of repetitions (or the number of repeated transmissions) may be 2, 4, 6, or 8. That is, the K number of repetitions may include at least one of 2, 4, 6, and / or 8. As an example, the K number of repetitions may be {2, 4, 8}.

[0121] The base station can configure / indicate candidates for the PUCCH repetition transmission factor (or repetition factor) for Msg.4 HARQ-ACK transmission to the terminal via higher layer signaling (e.g., SIB, etc.). As an example, the base station can configure / indicate multiple candidates from {1, 2, 4, 8} to the terminal based on the SIB. The base station can indicate one of the configured / indicated repetition factor candidates to the terminal via the specific DCI field (e.g., MCS field, Downlink assignment index (DAI) field, HARQ process number (HPN) field, etc.).

[0122] To determine the size of a bit field for indicating a PUCCH repetition transmission factor (or repetition factor) in the DCI format, the following embodiment may be considered.

[0123] According to one embodiment, regardless of the number of repetition factors configured in the UE, the bit field size of the DCI for indicating the repetition factor can be predefined (e.g., 2 bits). Specifically, regardless of whether the base station indicates a repetition factor from {1, 2, 4, 8} through higher layer signaling (e.g., SIB, etc.), 2 bits of a specific field can always be used to indicate the repetition factor of the PUCCH for Msg.4 HARQ-ACK transmission.

[0124] It may be assumed that the base station indicates two of {1, 2, 4, 8} to the terminal via higher layer signaling (e.g., SIB, etc.). The values ​​set / indicated by the base station may be {a1, a2}. a1 may be indicated by the state 00 value (or 10) of the 2-bit field, a2 may be indicated by the state 01 value (or 11) of the 2-bit field, and the remaining states 10, 11 (or 00, 01) may be set to reserved states, etc.

[0125] In this specification, for convenience of explanation, the value of the bit field of DCI is described as state 00 to 11, but the value of the bit field of DCI may also be referred to as a codepoint. As a specific example, the codepoint of the 2-bit field of DCI may be "00", "01", "10", or "11". The codepoint based on the 2-bit field of DCI may include "00", "01", "10", and "11".

[0126] It may be assumed that the base station indicates three of {1, 2, 4, 8} to the terminal via higher layer signaling (e.g., SIB, etc.). The values ​​set / indicated by the base station may be {a1, a2, a3}. a1 may be indicated by the state 00 value (or 11) of the 2-bit field, a2 by the state 01 value (or 10) of the 2-bit field, and a3 by the state 10 value (or 01) of the 2-bit field, and the remaining state 11 (or 00) may be set to a reserved state.

[0127] It may be assumed that the base station indicates four of {1, 2, 4, 8} to the terminal via higher layer signaling (e.g., SIB, etc.). The values ​​set / indicated by the base station may be {a1, a2, a3, a4}. a1 may be indicated using the state00 value (or 11) of the 2-bit field, a2 the state01 value (or 10) of the 2-bit field, a3 the state10 value (or 01) of the 2-bit field, and a4 the state11 value (or 00) of the 2-bit field.

[0128] According to one embodiment, a method may be considered in which a PUCCH repetition factor corresponding to each state value of the 2-bit field is predefined as one of {1, 2, 4, 8}. As an example, repetition factor 1 may be indicated as state 00 (or 11), repetition factor 2 as state 01 (or 10), repetition factor 4 as state 10 (or 01), and repetition factor 8 as state 11 (or 00). Based on the above definitions, the terminal may expect to be indicated only states corresponding to each of a plurality of repetition factor values ​​pre-configured / indicated by the base station through higher layer signaling (e.g., SIB). The terminal may expect that states not corresponding to a plurality of repetition factor values ​​will not be indicated by the base station. That is, the terminal may regard the state as a reserved state.

[0129] Based on the above-described embodiment, the terminal may assume (expect) that the base station uses the MSB (or LSB) 2-bit field of the specific DCI field for PUCCH repetition transmission. The terminal may assume (expect) that the remaining DCI field (i.e., the remaining bits excluding the 2-bit field) is used according to the existing scheme or for existing operations. For example, when an MCS field is used, the terminal may expect that the MSB (or LSB) 2 bits of the total 5-bit field are used for PUCCH repetition transmission. The terminal may expect that the remaining 3-bit field is used to indicate the lowest (or highest, or a selected portion) 8 indexes of the indexes of the existing MCS table.

[0130] As another example, when a Downlink Assignment Index (DAI) field is used, the terminal can expect that both of the MSB (or LSB) 2 bits of the total 2-bit field are used for PUCCH repeated transmission.

[0131] However, in the proposed method, even if the base station indicates only two repetition factors out of {1, 2, 4, 8} through higher layer signaling, the entire 2-bit field is always used, although it can be indicated in a 1-bit field. In this regard, the following embodiment may be considered.

[0132] According to one embodiment, a method may be considered in which the size of a DCI field used to indicate a repetition factor is varied based on the number of repetition factors (i.e., repetition factor candidates) configured in a terminal by a base station. This will be described in detail below.

[0133] Depending on which of {1, 2, 4, 8} the base station indicates through higher layer signaling (e.g., SIB, etc.), it may be possible for the terminal to interpret the size of a specific DCI field for indicating the PUCCH repetition factor differently.

[0134] In this case, the size of the DCI field based on the proposed method can be divided into a case where the base station sets two repetition factors (e.g., two of {1, 2, 4, 8}) via higher layer signaling (e.g., SIB, etc.) and a case where the base station sets three or more repetition factors (e.g., three or four of {1, 2, 4, 8}).

[0135] First, the base station may configure / indicate two values ​​out of {1, 2, 4, 8} to the terminal via higher layer signaling (e.g., SIB, etc.) as candidate values ​​for the PUCCH repetition factor for Msg.4 HARQ-ACK. In this case, only one bit of the specific DCI field may be required to actually indicate the number of repetitions to the terminal. As a result, when two values ​​out of {1, 2, 4, 8} are configured, the base station may indicate the number of PUCCH repetitions (repetition factor) to the terminal using the MSB (or LSB) 1-bit field of the specific DCI field. The values ​​configured / indicated by the base station via higher layer signaling (e.g., SIB, etc.) may be {a1, a2} in the order in which they are configured / indicated (or in ascending or descending order). a1 may be indicated using the state0 value (or 1) of the 1-bit field. a2 may be indicated using the state1 value (or 0) of the 1-bit field.

[0136] The terminal may expect that the base station will use the MSB (or LSB) 1-bit field of the specific DCI field for PUCCH repetition transmission. The terminal may expect that the remaining DCI fields will be used according to the existing method or for existing operations.

[0137] For example, when an MCS field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 5-bit field is used for PUCCH repeated transmission, and the UE may expect that the remaining 4-bit field is used to indicate the lowest (or highest, or a selected portion) 16 indexes of the existing MCS table indexes.

[0138] As another example, when a Downlink Assignment Index (DAI) field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 2-bit field is used for PUCCH repeated transmission, and the UE may expect that the remaining 1-bit field is used as reserved, as in the past.

[0139] As another example, when the HARQ process number field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 4-bit field is used for PUCCH repetition transmission, and the UE may expect that the remaining 3-bit field is used to indicate the lowest (or highest, or a selected portion) 8 indexes of the existing HARQ process number indexes.

[0140] Second, the base station may configure / indicate to the terminal three or more values ​​among {1, 2, 4, 8} as candidate values ​​for the PUCCH repetition factor for Msg.4 HARQ-ACK via higher layer signaling (e.g., SIB, etc.). In this case, two bits of the specific DCI field may be required to actually indicate the number of repetitions to the terminal. As a result, when three or four values ​​among {1, 2, 4, 8} are configured, the base station may indicate the number of PUCCH repetitions to the terminal using the MSB (or LSB) 2-bit field of the specific DCI field. The values ​​configured / indicated by the base station via higher layer signaling (e.g., SIB, etc.) may be {a1, a2, a3} in the order of configuration / indication (or in ascending or descending order). a1 may be indicated using the state00 value (or 11) of the 2-bit field. a2 may be indicated using the state01 value (or 10) of the 2-bit field. a3 can be indicated using the state 10 value of the 2-bit field (or 01). The state 11 value of the 2-bit field (or 00) can be set to the reserved state.

[0141] Also, the values ​​set / indicated by the base station via higher layer signaling (e.g., SIB, etc.) may be {a1, a2, a3, a4} in the order of setting / indication (or in ascending or descending order). a1 can be indicated using the state00 value (or 11) of the 2-bit field. a2 can be indicated using the state01 value (or 10) of the 2-bit field. a3 can be indicated using the state10 value (or 01) of the 2-bit field. a4 can be indicated using the state11 value (or 00) of the 2-bit field.

[0142] (Similar to the above definition in the embodiment where the size of the DCI field for indicating the repetition factor is always fixed to 2 bits) The terminal can expect that the base station will use the MSB (or LSB) 2-bit field of the specific DCI field for PUCCH repetition transmission. The terminal can expect that the remaining DCI field will be used according to the existing scheme or for existing operation.

[0143] For example, when an MCS field is used, the UE may expect that the MSB (or LSB) 2 bits of the total 5-bit field are used for PUCCH repeated transmission, and the UE may expect that the remaining 3-bit field is used to indicate the lowest (or highest, or a selected portion) 8 indexes of the existing MCS table indexes.

[0144] As another example, when a Downlink Assignment Index (DAI) field is used, the terminal can expect that both of the MSB (or LSB) 2 bits of the total 2-bit field are used for PUCCH repeated transmission.

[0145] As another example, when the HARQ process number field is used, the UE may expect that the MSB (or LSB) 2 bits of the total 4-bit field are used for PUCCH repetition transmission, and the UE may expect that the remaining 2-bit field is used to indicate the lowest (or highest, or a selected portion) 4 indexes of the existing HARQ process number indexes.

[0146] [Proposed method 2]

[0147] A specific repetition number value can be added to the initial PUCCH resource set table. Alternatively, a specific number of repetition number sets can be predefined / configured. Then, the base station can configure / indicate the actual repetition number to the terminal via higher layer signaling (e.g., SIB, etc.) or other indication methods (e.g., DCI, etc.). This will be described in detail below.

[0148] The base station may set K repetition number sets to the terminal in advance for each PUCCH resource set index (or for each rPUCCH) in the initial PUCCH resource set table. The base station may set one of the K repetition number sets through higher layer signaling (e.g., SIB, etc.). Alternatively, the base station may set one of the K repetition number sets based on Msg.2 / 4 PDSCH and / or DCI scheduling Msg.2 / 4 PDSCH, etc.

[0149] As another method, a method of fixing a specific repetition number for each PUCCH resource set index (or for each rPUCCH) in the initial PUCCH resource set table may be considered. This embodiment may be performed based on an existing table or a newly introduced table. For example, the setting according to this embodiment may be performed by reusing an existing table. For example, the setting according to this embodiment may be performed based on a newly introduced table for repetition. In the new table, different repetition numbers may be mapped to the same PUCCH format.

[0150] In this case, the number of repetitions (or the number of repeated transmissions) may be 2, 4, 6, or 8. That is, the K number of repetitions may include at least one of 2, 4, 6, and / or 8. As an example, the K number of repetitions may be {2, 4, 8}.

[0151] [Proposed method 3]

[0152] One or more repetition numbers can be preset / instructed based on the NTN platform type (or satellite type, or satellite altitude, or UE type), etc. This will be explained in detail below.

[0153] Due to the characteristics of the NTN system, differences in UL signal / channel performance may occur depending on the NTN satellite type (or satellite altitude, etc.). Taking this into consideration, the repetition number (or repetition number set) used / applied to the initial PUCCH resource set can be pre-set / determined / defined based on the NTN satellite type / altitude and / or UE type, etc.

[0154] For example, when the NTN is determined according to the satellite type, different repetition numbers (or repetition number sets) may be pre-set / determined / defined to be used according to the geostationary Earth orbit (GEO), medium Earth orbit (MEO), low Earth orbit (LEO), etc. Then, the terminal can receive satellite orbit information to know the NTN type, and can determine the repetition number of the initial PUCCH resource set based on this.

[0155] Alternatively, the UE can receive satellite orbit information to know the NTN type, through which the repetition number set of the initial PUCCH resource set can be determined.Then, the base station can set / indicate the actual repetition number to the UE via another indication method (e.g., DCI, etc.).

[0156] [Proposed method 4]

[0157] The repetition request resource and the number of repetitions for the PUCCH for Msg.4 HARQ-ACK can be set in conjunction with the repetition request resource and the number of repetitions for the Msg.3 PUSCH, as will be described in detail below.

[0158] If a UE requires repeated transmission of the PUCCH for Msg.4 HARQ-ACK, it is likely that repeated transmission of the Msg.3 PUSCH is also required. Therefore, a method similar to the triggering method for Msg.3 PUSCH repetition introduced in Rel-17 NR CE can also be introduced for triggering repeated transmission of the PUCCH for Msg.4 HARQ-ACK.

[0159] A terminal that requests Msg.3 PUSCH repetition can operate as follows: The terminal can select and transmit one preamble index from existing RACH preamble resources that the base station has previously allocated to request Msg.3 PUSCH repetition. This allows the terminal to inform the base station that Msg.3 PUSCH repetition is required.

[0160] A similar method can be applied to repeated transmission of PUCCH for Msg.4 HARQ-ACK. The UE can select and transmit one of the existing RACH preamble resources that the base station has previously allocated to request Msg.3 PUSCH repetition. This allows the UE to inform the base station that repeated transmission of PUCCH for Msg.4 HARQ-ACK is required.

[0161] Alternatively, the base station may allocate / configure new resources to the terminal among the existing RACH preamble resources so that the terminal can request repeated transmission of PUCCH for Msg.4 HARQ-ACK. The terminal can transmit a RACH preamble based on one of the configured resources. This allows the terminal to inform the base station that repeated transmission of PUCCH for Msg.4 HARQ-ACK is required.

[0162] As an example, since there may be many situations in which a UE needs to simultaneously perform Mg.3 PUSCH repetition transmission and PUCCH for Mg.4 HARQ-ACK repetition transmission, the following embodiment may be considered: The RACH preamble resource for a newly defined PUCCH for Mg.4 HARQ-ACK repetition transmission request may be the same as the RACH preamble resource allocated for the Mg.3 PUSCH repetition request, or may be configured to be included within the resource.

[0163] As an example, to increase the flexibility of RACH preamble resource allocation in the base station, the following embodiment may be considered: The RACH preamble resource for a newly defined PUCCH for Msg.4 HARQ-ACK repetition transmission request may be configured independently of the RACH preamble resource allocated for the Msg.3 PUSCH repetition request.

[0164] On the other hand, if the terminal selects a specific preamble index because repeated transmission of PUCCH for Msg.4 HARQ-ACK is required (i.e., selects one of the pre-configured RACH preamble resources), the following operation may be performed.

[0165] When a UE receives a specific DCI (e.g., a DCI scheduling a PDSCH in Mg.4 or a DCI scheduling an RAR in Mg.2) and interprets the field, the UE may expect that a specific field (e.g., a PUCCH repetition indicator field) will be included and transmitted. Examples of the specific DCI field include an MCS field and a TDRA field.

[0166] Furthermore, the base station can set / instruct the repetition number value of PUCCH for Mg.4 HARQ-ACK to the existing Mg.3 PUSCH repetition number value in higher layer signaling (eg, SIB, etc.).

[0167] That is, as an example, K (e.g., K=4) combinations each consisting of a Mg.3 PUSCH repetition number value X and a PUCCH for Mg.4 HARQ-ACK repetition number value Y can be configured / instructed to a terminal via higher layer signaling (e.g., SIB, etc.). For example, when K=4, the repetition numbers (X, Y) configured in the terminal may be {(x1, y1), (x2, y2), (x3, y3), (x4, y4)}. Then, a specific X value can be instructed to the terminal from the base station via Mg.2 RAR or via the upper 2 bits of a specific field (e.g., MCS field) of DCI (e.g., DCI format0_0) scheduling Mg.2 RAR. The X value is applied to repeated transmission of Mg.3 PUSCH, and the Y value paired with the X value can be applied to repeated transmission of PUCCH for Mg.4 HARQ-ACK.

[0168] As an example, it may be assumed that the X and Y values ​​are set / indicated as integers greater than 1, and the UE selects and transmits one of predefined preamble resources to request Mg.3 PUSCH repeat transmission. That is, it may be assumed that the UE requests both Mg.3 PUSCH repeat transmission and PUCCH for Mg.4 HARQ-ACK repeat transmission. The above-described embodiment is preferably used when both Mg.3 PUSCH repeat transmission and PUCCH for Mg.4 HARQ-ACK repeat transmission are required.

[0169] Furthermore, it can be assumed that when the repetition number value of PUCCH for Msg.4 HARQ-ACK, which can be set / indicated by the base station via higher layer signaling (e.g., SIB, etc.), is not 4 but 3, 2, etc. Even in this case, an operation of pairing (or mapping) with 4 Msg.3 PUSCH repetition number values may be required. Summarizing this, it is as follows. It is assumed that in the proposed method below, etc., the repetition number value has a form where the minimum value is indicated first and the maximum value is indicated later (e.g., a1 < a2 < a3 < a4, b1 < b2 < b3 < b4).

[0170] The repetition number of PUCCH for Msg.4 HARQ-ACK can be set to 3 or less via higher layer signaling (e.g., SIB, etc.). For example, a repetition number of 3 or less can be set / indicated by the base station to the terminal.

[0171] The set / indicated repetition number value of Msg.4 HARQ-ACK, etc., and the 4 Msg.3 PUSCH repetition numbers, etc., can be paired based on the following order / rules.

[0172] A. Option 1) Pair one by one from the minimum value (or maximum value), and set the remaining digits to reuse the maximum value (or minimum value).

[0173] i. For example, one method can be considered where the remaining digits are pared one by one starting from the minimum value and the maximum value is reused. The Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2, b3}. The Mg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, b1), (a2, b2), (a3, b3), (a4, b3)}.

[0174] ii. As another example, a method can be considered in which the remaining digits are paired one by one from the maximum value (in reverse order), and the minimum value is reused for the remaining digits. The Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2}. The Mg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, b1), (a2, b1), (a3, b1), (a4, b2)}.

[0175] B. Option 1a) (The result is the same as option 1, but expressed differently) Pair one by one from the minimum (or maximum) value. If a state that has not been paired is specified, the terminal will understand that it has been specified with the maximum (or minimum) value.

[0176] i. For example, the UE may consider a method in which the digits are paired one by one starting from the minimum value, and the remaining digits are not paired, and the maximum value is regarded as being indicated. The Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2, b3}. The Mg.3 PUSCH repetition number indicator field value may be set to {00, 01, 10, 11} = {(a1, b1), (a2, b2), (a3, b3), (a4, -)}.

[0177] If the Msg.3 PUSCH repetition number indicator field is set to '11', the terminal can determine that b3 is set as the Msg.4 HARQ-ACK PUCCH repetition number.

[0178] ii. As another example, a method can be considered in which the digits are paired one by one starting from the maximum value (in reverse order), and the remaining digits are not paired, so that the UE understands that the minimum value is indicated. The Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2}. The Mg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, -), (a2, -), (a3, b1), (a4, b2)}.

[0179] If the Msg.3 PUSCH repetition number indicator field is indicated as '00' or '01', the terminal can determine that b1 is indicated as the Msg.4 HARQ-ACK PUCCH repetition number.

[0180] C.Option 2) The minimum and maximum values ​​are paired with the maximum and / or minimum values ​​of the Msg.3 PUSCH repetition number, and the remaining digits are reused as intermediate values.

[0181] i. For example, the Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2, b3}. The Mg.3 PUSCH repetition number indicator field value may be set to {00, 01, 10, 11} = {(a1, b1), (a2, b2), (a3, b2), (a4, b3)}.

[0182] D. Option 3) (When two PUCCH repetition numbers are transmitted) Set the Msg.3 PUSCH repetition number to Msg.4 HARQ-ACK PUCCH repetition number to be paired at a ratio of 2:1 from the minimum (or maximum) value.

[0183] i. For example, the Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2}. The Mg.3 PUSCH repetition number indicator field value may be set to {00, 01, 10, 11} = {(a1, b1), (a2, b1), (a3, b2), (a4, b2)}.

[0184] E. Option 4) A method in which the base station pairs a specific Mg.3 PUCCH repetition number value with a specific Mg.4 HARQ-ACK PUCCH repetition number value or directly configures / instructs the value via higher layer signaling (e.g., SIB, etc.)

[0185] i. For example, the Mg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and the Mg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2}. The Mg.3 PUSCH repetition number indicator field value may be indicated as 1 or 2 below.

[0186] 1.{00, 01, 10, 11}={(a1, b1), (a2, b1), (a3, b2), (a4, b2)}

[0187] 2.{00, 01, 10, 11}={(a1, b1), (a2, b1), (a3, b1), (a4, b2)}

[0188] F. Option 5) A method in which multiple candidates are defined in advance that define how they are paired between Mg.3 PUSCH repetition number and Mg.4 HARQ-ACK PUCCH repetition number, and the base station indicates one of them to higher layer signaling (e.g., SIB, etc.)

[0189] G. The Mg.3 PUSCH repetition number and / or Mg.4 HARQ-ACK PUCCH repetition number used in the proposed method and the like may be a positive integer including 1.

[0190] i. That is, the Msg.3 PUSCH repetition number may be {1, 2, 3, 4, 7, 8, 12, 16}, etc., and the Msg.4 HARQ-ACK PUCCH repetition number may be {1, 2, 4, 8}, etc.

[0191] ii. Consequently, a single transmission of Mg.3 PUSCH can be paired with repeated transmission of Mg.4 HARQ-ACK PUCCH, and conversely, repeated transmission of Mg.3 PUSCH can be paired with a single transmission of Mg.4 HARQ-ACK PUCCH, or a single transmission of Mg.3 PUSCH can be paired with a single transmission of Mg.4 HARQ-ACK PUCCH.

[0192] Meanwhile, as another method, the Mg.4 HARQ-ACK PUCCH repetition number set may be determined according to the Mg.3 PUSCH repetition number value instructed to the UE. Specifically, the base station may set / instruct {A, B, C, D} as the Mg.3 PUSCH repetition number value to the UE. The base station may also set / instruct {a, b, c, d} as the Mg.4 HARQ-ACK PUCCH repetition number value to the UE. In this case, if the base station instructs the UE to set A as the Mg.3 PUSCH repetition number, the Mg.4 HARQ-ACK PUCCH repetition number set for the UE may be determined to be {a, b}. On the other hand, if the base station instructs the UE to set B as the Mg.3 PUSCH repetition number, the Mg.4 HARQ-ACK PUCCH repetition number set for the UE may be determined to be {c, d}. In this case, the terminal can monitor DCI format 0_1, expecting that the base station will dynamically indicate the repetition number of Msg.4 HARQ-ACK PUCCH using a 1-bit field.

[0193] The above-mentioned proposed method is a method of implicitly mapping the Mg.3 PUSCH repetition number and the Mg.4 HARQ-ACK PUCCH repetition number. Furthermore, it is also possible to consider applying the above-mentioned proposed method to the PRACH repetition number and the Mg.4 HARQ-ACK PUCCH repetition number in the same way.

[0194] As a specific proposed method, the Mg.4 HARQ-ACK PUCCH repetition number or a set of repetition numbers may be determined according to the PRACH repetition number value selected by the UE. Specifically, the base station may configure / indicate one or more PRACH repetition numbers via higher layer signaling. In this case, if the UE has the PRACH repetition feature and intends to perform repetitive transmission, an appropriate PRACH repetition number may be selected according to the UE's RSRP level. In addition, if the UE also has the Mg.4 HARQ-ACK PUCCH repetition feature and intends to perform repetitive transmission, the repetition number or set of repetition numbers for the Mg.4 HARQ-ACK PUCCH repetition may be determined according to the previously selected PRACH repetition number value.

[0195] As an example, it can be assumed that the PRACH repetition numbers set by the base station are A and B (e.g., A < B), and the repetition numbers of Msg.4 HARQ-ACK PUCCH set by the base station are a and b (e.g., a < b). When the terminal selects the PRACH repetition number A, the repetition number of Msg.4 HARQ-ACK PUCCH can be set to a. When the terminal selects the PRACH repetition number B, the repetition number of Msg.4 HARQ-ACK PUCCH can be set to b. In such a case, the terminal expects not to dynamically indicate the repetition number of Msg.4 HARQ-ACK PUCCH and can monitor DCI format 0_1.

[0196] As another example, it can be assumed that the PRACH repetition numbers set by the base station are A and B (e.g., A < B), and the repetition numbers of Msg.4 HARQ-ACK PUCCH set by the base station are a, b, c, d (e.g., a < b < c < d). When the terminal selects the PRACH repetition number A, the repetition number set of Msg.4 HARQ-ACK PUCCH can be set to {a, b}. When the terminal selects the PRACH repetition number B, the repetition number set of Msg.4 HARQ-ACK PUCCH can be set to {c, d}. In such a case, the terminal expects that the base station dynamically indicates the repetition number of Msg.4 HARQ-ACK PUCCH using a 1-bit field and can monitor DCI format 0_1.

[0197] As yet another example, it may be assumed that the PRACH repetition numbers set by the base station are A and B (e.g., A < B), and the repetition numbers of the Msg.4 HARQ-ACK PUCCH set by the base station are a, b, c, d (e.g., a < b < c < d). When the terminal selects the PRACH repetition number A, the repetition number of the Msg.4 HARQ-ACK PUCCH can be set to a. When the terminal selects the PRACH repetition number B, the repetition number set of the Msg.4 HARQ-ACK PUCCH can be set to {b, c, d}. In such a case, when the terminal selects the PRACH repetition number A, the terminal expects not to dynamically indicate the repetition number of the Msg.4 HARQ-ACK PUCCH and can monitor the DCI format 0_1. On the other hand, when the terminal selects the PRACH repetition number B, the terminal expects that the base station dynamically indicates the repetition number of the Msg.4 HARQ-ACK PUCCH using a 2-bit field and can monitor the DCI format 0_1.

[0198] Furthermore, a method in which the PRACH repetition number and / or the Msg.3 PUSCH repetition number and / or the Msg.4 HARQ-ACK PUCCH repetition number, etc. are implicitly paired with each other can be considered. As an example, the Msg.3 PUSCH repetition number set can be implicitly determined by the PRACH repetition number value selected by the terminal, and the Msg.4 HARQ-ACK PUCCH repetition number can be implicitly determined via the Msg.3 PUSCH repetition number value indicated by the base station.

[0199] The above operations may be applied when a specific terminal has the Mg.4 HARQ-ACK PUCCH repetition feature and is attempting to perform repetitive transmission, and at the same time has the Mg.3 PUSCH repetition feature and / or PRACH repetition feature and is attempting to perform repetitive transmission. If a specific terminal has only the Mg.4 HARQ-ACK PUCCH repetition feature and is attempting to perform repetitive transmission of only this feature, it may operate independently regardless of the PRACH repetition number and / or Mg.3 PUSCH repetition number set by the base station. That is, when the base station sets / instructs multiple Mg.4 HARQ-ACK PUCCH repetitions, it is expected that the base station will dynamically indicate the repetition number of the Mg.4 HARQ-ACK PUCCH using an N-bit field (N=1 or 2), and it can be configured to monitor DCI format 0_1. When the base station sets / instructs one Mg.4 HARQ-ACK PUCCH repetition, it is expected that the base station will not dynamically indicate the repetition number of the Mg.4 HARQ-ACK PUCCH, and it can be configured to monitor DCI format 0_1.

[0200] [Proposed method 5]

[0201] A method of providing one repetition number that can be provided to the initial PUCCH resource set via higher layer signaling (e.g., SIB, etc.) and a method of providing multiple repetition number sets and then setting / indicating the repetition numbers via other indication methods (e.g., DCI, etc.) can be simultaneously supported. An embodiment that can be applied in this case will be described in detail below.

[0202] i) A method of setting / indicating one cell-specific PUCCH repetition number via higher layer signaling (e.g., SIB, etc.), and ii) a method of providing multiple repetition number sets and then dynamically setting / indicating PUCCH repetition numbers via other indication methods (e.g., DCI, etc.) can be simultaneously supported. In this case, the UE can operate based on one of the following options.

[0203] (Option 1) One cell-specific PUCCH repetition number can be configured in the terminal from the base station via higher layer signaling (e.g., SIB, etc.). The terminal can understand and operate as if only one cell-specific PUCCH repetition number is always supported in the cell. Characteristically, in this case, other parameters related to the PUCCH repetition factor can be configured to be ignored. As a result, the terminal can expect that the PUCCH repetition (repetition number / factor) will not be dynamically indicated. The terminal can interpret a specific (DCI) field defined to dynamically indicate PUCCH repetition in the same way as existing operations in which repetition is not supported.

[0204] Alternatively, multiple repetition number sets can be configured / provided to the terminal from the base station. The terminal can understand that the repetition number is always dynamically indicated in the cell and operate accordingly. Characteristically, even in this case, the terminal can be configured to ignore other parameters related to the PUCCH repetition factor. As a result, the terminal can expect that the PUCCH repetition (i.e., the repetition number) is dynamically indicated. The terminal can understand that a specific (DCI) field defined to be able to dynamically indicate PUCCH repetition supports repetition and can determine the repetition number (repetition factor).

[0205] Alternatively, the terminal may expect that an operation in which one cell-specific PUCCH repetition number is set and an operation in which multiple repetition number sets are provided from the base station via higher layer signaling (e.g., SIB, etc.) do not occur simultaneously. That is, when the base station indicates a cell-specific PUCCH repetition number via a higher layer parameter, it may not indicate a parameter in which multiple repetition number sets are provided. Or, conversely, when the base station indicates multiple repetition number sets via a higher layer parameter, it may not indicate a parameter indicative of a cell-specific PUCCH repetition number.

[0206] (Option 2) A cell-specific PUCCH repetition number can be configured in the terminal from the base station via higher layer signaling (e.g., SIB, etc.). The terminal can interpret / determine the value as a part of a value that can be dynamically indicated. That is, the cell-specific indicated value can be overridden by a dynamically indicated value.

[0207] As an example, one cell-specific PUCCH repetition number can be set to the maximum value among the values ​​that can be dynamically indicated. That is, when a cell-specific N value is indicated, the dynamically indicated repetition factor can be M values ​​less than or equal to N (e.g., if M is 4, N, N-1, N-2, N-3, or N, N / 2, N / 4, N / 8, etc.). The base station can then set / indicate the actual repetition number to the terminal via another indication method (e.g., DCI, etc.). In this case, the terminal can expect to be indicated the repetition factor via a specific (DCI) field defined to dynamically indicate PUCCH repetition. Then, if a specific repetition factor is indicated from the base station, the terminal can perform PUCCH repetition accordingly.

[0208] As another example, one cell-specific PUCCH repetition number can be set to the minimum value excluding 1 among the dynamically indicated values. That is, when N values ​​are indicated as cell-specific, dynamically indicated repetition factors can be indicated / configured to the UE with a total of M values ​​greater than or equal to N, including M-1 values ​​and 1 (e.g., if M is 4, 1, N, N+1, N+2, or 1, N, 2×N, 4×N, etc.). The base station can then set / indicate the actual repetition number via another indication method (e.g., DCI, etc.). In this case, the UE can expect to be indicated the repetition factor via a specific (DCI) field defined to dynamically indicate PUCCH repetition. Then, if a specific repetition factor is indicated from the base station, the UE can perform PUCCH repetition accordingly.

[0209] (Option 3) One cell-specific PUCCH repetition number can be configured / indicated to the terminal from the base station via higher layer signaling (e.g., SIB, etc.). Furthermore, a situation can be considered in which a set of PUCCH repetition numbers to be dynamically configured / indicated later is configured / indicated to the terminal from the base station via higher layer signaling (e.g., SIB, etc.). Characteristically, the cell-specific PUCCH repetition number value configured / indicated by the base station and the PUCCH repetition number value to be dynamically configured / indicated later can be configured independently of each other. Thereafter, the operation of the terminal can be instructed by the base station via a specific (DCI) 1-bit field, etc. Specifically, the base station can inform the terminal via the specific (DCI) 1-bit field, etc., whether the terminal uses a cell-specific PUCCH repetition number or dynamically configures / indicates one of a plurality of pre-configured PUCCH repetition number values.

[0210] As an example, the MSB 1 bit of the MCS field of DCI format 0_1 ​​that schedules Msg4 PDSCH may be used. Based on this MSB 1 bit, the terminal may be instructed whether to use a cell-specific PUCCH repetition number or to dynamically configure / instruct to use one of a plurality of preset PUCCH repetition number values. If the base station instructs the terminal to use a cell-specific PUCCH repetition number, it may configure / instruct the terminal to use an MCS value through the remaining 4 bits of the MCS field. If the base station instructs the terminal to dynamically configure / instruct to use one of a plurality of preset PUCCH repetition number values, it may configure / instruct the terminal to use the next MSB L bits (excluding the previously used MSB 1 bit) (e.g., if a total of K repetition numbers are configured, L bits The actual repetition number can be set / indicated to the terminal using the remaining 5-1-L bit MCS field. The base station can set / indicate the MCS value to the terminal via the remaining 5-1-L bit MCS field.

[0211] (Option 4) A situation can be considered in which the terminal is instructed of one cell-specific PUCCH repetition number from the base station via higher layer signaling (e.g., SIB, etc.). Furthermore, it can be configured whether the base station instructs the terminal of a set of PUCCH repetition numbers to be dynamically set / instructed later via higher layer signaling (e.g., SIB, etc.). If the base station does not instruct the terminal of a set of PUCCH repetition numbers to be dynamically set / instructed later, the terminal can operate as in Option 1 or Option 2. On the other hand, if the base station instructs the terminal of a set of PUCCH repetition numbers to be dynamically set / instructed later, the terminal can operate as in Option 1 or Option 3.

[0212] How to modify / add the Initial PUCCH resource set table

[0213] In the existing initial PUCCH resource set table, PUCCH format 1 occupying 14 OFDM symbols is considered to be repeatedly transmitted for coverage enhancement. That is, in Table 2, a total of five indexes, from index 11 to index 15, are resources considered for repeated transmission, so the following methods may be further considered.

[0214] [Proposed method A]

[0215] When PUCCH for Msg.4 HARQ-ACK repeated transmission is considered, the terminal expects the value of the parameter (e.g., pucch-ResourceCommon) that determines the index of the initial PUCCH resource set via SIB to be indicated as one of 11, 12, 13, 14, or (15).

[0216] In the case of at least one of i) to iii), i) when the terminal requests repeated transmission of PUCCH for Msg.4 HARQ-ACK, ii) when the terminal reports UE capability for repeated transmission of PUCCH for Msg.4 HARQ-ACK to the base station, and / or iii) when the base station sets / instructs the number of repeated transmissions of PUCCH for Msg.4 HARQ-ACK via higher layer signaling (e.g., SIB, etc.), the following embodiments may be considered.

[0217] The UE may expect the base station to set / indicate one of the indexes configured in PUCCH format 1 occupying 14 OFDM symbols. That is, the UE may expect one of 11, 12, 13, 14, and 15 to be set / indicated as a parameter (e.g., pucch-ResourceCommon) value determining the index of the initial PUCCH resource set via the SIB. Alternatively, the UE may expect a value less than or equal to 10 to be set / indicated as the parameter value. Alternatively, the UE may expect one of 11, 12, 13, and 14 to be set / indicated as the parameter value. Alternatively, the UE may expect a value less than or equal to 10 to be set / indicated as the parameter value, excluding 15.

[0218] [Proposed method B]

[0219] How to further introduce a new table for PUCCH for Msg.4 HARQ-ACK repeated transmission

[0220] Since there are five indexes (11, 12, 13, 14, 15) configured in PUCCH format 1 occupying 14 OFDM symbols in the existing table, Table 2, it can be considered to add M indexes to this and add a new table for PUCCH for Msg.4 HARQ-ACK repeat transmission. When a new table for repeat transmission is added in this manner, the following operation can be performed. The base station can configure / instruct the terminal via higher layer signaling (e.g., SIB, etc.) whether to use the existing table (i.e., Table 2) that does not consider repeat transmission, or to use a new table that considers repeat transmission. The terminal can determine which table to refer to by determining whether to configure / instruct this.

[0221] Alternatively, the UE may refer to other parameter values ​​to determine whether to refer to an existing table or a new table. The table to be referenced by the UE may be predefined. For example, if a new table for repeated transmission is newly defined separately from the existing table and a repetition number set for PUCCH for Msg.4 HARQ-ACK is provided via higher layer signaling (e.g., SIB, etc.) (or if the repetition number of Mg.3 PUSCH and the paired repetition number of PUCCH for Msg.4 HARQ-ACK are provided, or if the UE requests repeated transmission of PUCCH for Msg.4 HARQ-ACK), the UE may expect the base station to configure / indicate the initial PUCCH resource set index using the new table.

[0222] As another example, even if a new table for repeated transmission is newly defined separately from the existing table, if a repetition number set for PUCCH for Msg.4 HARQ-ACK is not provided via higher layer signaling (e.g., SIB, etc.) (or if a repetition number for PUCCH for Msg.4 HARQ-ACK paired with a repetition number for Msg.3 PUSCH is not provided, or if the UE does not request repeated transmission of PUCCH for Msg.4 HARQ-ACK), the UE may expect the base station to configure / indicate the initial PUCCH resource set index using the existing table. The UE may determine that repeated transmission for PUCCH for Msg.4 HARQ-ACK is not configured / indicated.

[0223] Basically, the newly introduced initial PUCCH resource set index may be considered in the following operation / setting, since it is preferable to maintain PUCCH format 1, which occupies 14 OFDM symbols. The first symbol may always be fixed to 0. Furthermore, a new index may be defined by adding a PRB offset value, a set of initial CS indexes value, or a repetition number value. For example, the new index may be expressed as the following option:

[0224] [Option 1]

[0225] Add three new indexes to the existing table's indexes 11, 12, 13, 14, and 15, creating a new table with a total of eight indexes (i.e., 3-bit indication).

[0226] It may be considered to add three new indexes as shown in Table 3 or Table 4 below. A total of eight indexes are configured, and the base station can set / indicate one of the eight indexes to the terminal through a 3-bit field of the SIB (one bit field less than the existing operation). That is, the PUCCH format, First symbol, and Number of symbols are fixed to 1, 0, and 14, respectively, and new indexes may be defined through the combination of the PRB offset set of initial CS indexes. It may be possible to consider a combination of PUCCH format 1 and CS{0, 4, 8}, which is not in the existing table, and it may also be possible to add a new value such as PRB offset 4 or 8 for CS{0, 6}.

[0227] This setting method can be applied in the same manner as the method of setting / indicating the repetition number or repetition number set via higher layer signaling proposed in connection with the embodiment related to the number of repeated transmissions of the Initial PUCCH resource set described above.

[0228] [Table 3]

[0229] Referring to Table 3, the items newly proposed by this embodiment are Index 1, 2, and 3.

[0230] [Table 4]

[0231] Referring to Table 4, the items newly proposed by this embodiment are Index 1, 2, and 6.

[0232] [Option 2]

[0233] Add 11 new indexes to indexes 11, 12, 13, 14, and 15 of the existing table, creating a new table with a total of 16 indexes (i.e., 4-bit indication).

[0234] It is possible to consider adding 11 new indexes as shown in Table 5 or Table 6 below. A total of 15 indexes are configured, and the base station can set / indicate one of the 15 indexes through a 4-bit field of the SIB (using the same bit field as in existing operations). That is, the PUCCH format, First symbol, and Number of symbols are fixed to 1, 0, and 14, respectively, and new indexes can be defined through a combination of the PRB offset, set of initial CS indexes, and / or repetition number.

[0235] In this case, a method of adding 11 new indexes to the existing 5 indexes without adding a repetition number item to the new table can be considered. That is, as shown in Table 5, a new index can be proposed through a combination of PRB offset and / or set of initial CS indexes.

[0236] On the other hand, when a repetition number item is added to the new table, a new table having a total of 16 new indexes is created by combining the five existing indexes with the newly introduced repetition number value. That is, the table is as shown in Table 6. This can be an example of a method of explicitly adding a repetition number to the initial PUCCH resource set table, which is one of the methods based on the above-mentioned embodiment related to the number of repeated transmissions of the initial PUCCH resource set.

[0237] In this case, as described above, if the base station does not intend to provide the initial PUCCH repetition, the base station can set / instruct to refer to an existing table through a separate instruction method.

[0238] [Table 5]

[0239] Referring to Table 5, the items newly proposed by this embodiment are Index 1, 2, 3, 4, 5, 6, 7, and 11 (Index 13-15 are reserved).

[0240] [Table 6]

[0241] Referring to Table 6, the items newly proposed in this embodiment are Index 0-15, and repetition numbers have been added.

[0242] 4 to 8 illustrate frequency hopping associated with repeated transmission according to an embodiment of the present specification. Hereinafter, frequency hopping (FH) operations during repeated transmission will be described in detail with reference to FIGS. 4 to 8.

[0243] Frequency hopping setting method when repeatedly transmitting the initial PUCCH resource set

[0244] When an existing initial PUCCH resource set is used (when it is not an interlaced structure), the UE is configured to perform intra-slot frequency hopping. In this case, even when repeated transmission of the initial PUCCH resource set is considered, repeated transmission can be performed while maintaining the existing intra-slot frequency hopping operation. For example, if the first hop of PUCCH format 1 corresponding to the initial PUCCH resource set is located at the lowest frequency and the second hop is located at the highest frequency according to the base station configuration, the UE can perform repeated transmission while maintaining the positions of each hop. As shown in FIG. 4, the UE can perform repeated transmission M times (e.g., M=4) based on the existing FH operation.

[0245] However, to improve the effectiveness of repeated transmissions, you can consider setting the frequency hopping operation as follows:

[0246] [Proposed method A]

[0247] When repeat transmission of PUCCH for Msg.4 HARQ-ACK is configured, inter-slot frequency hopping is applied (intra-slot frequency hopping is not applied).

[0248] First, a case may be assumed in which the number of repeated transmissions of PUCCH for Msg.4 HARQ-ACK is M (where M is an even number). The UE can transmit the first M / 2 times without frequency hopping in either the intra or inter slots. The UE can transmit the remaining M / 2 times by applying only inter slot frequency hopping compared to the initial transmission without intra slot frequency hopping. For example, the first hop of PUCCH format 1 corresponding to the initial PUCCH resource set may be located at the lowest frequency and the second hop may be located at the highest frequency, depending on the base station configuration. As shown in FIG. 5, the UE can perform repeated transmissions based on the lowest frequency (e.g., lowest PRB) at slot indexes N and N+1 without frequency hopping. The UE can perform repeated transmissions based on the highest frequency (e.g., highest PRB) at slot indexes N+2 and N+3.

[0249] Second, when repeated transmission of PUCCH for Msg.4 HARQ-ACK is applied, the terminal can perform repeated transmission as follows.

[0250] In the even slot (e.g., slot with even numbered index, slot index N, N+2 in FIG. 6), the terminal can transmit without frequency hopping in both intra and inter slots.

[0251] In odd-th slots (e.g., slots with odd numbered indexes, slot indexes N+1 and N+3 in FIG. 6), the UE may transmit by applying only inter-slot frequency hopping compared to the initial transmission without intra-slot frequency hopping. As an example, the 1st hop of PUCCH format 1 corresponding to the initial PUCCH resource set may be located at the lowest frequency and the 2nd hop may be located at the highest frequency, depending on the base station configuration. For example, as shown in FIG. 6, the UE may perform repeated transmission based on the lowest frequency (e.g., lowest PRB) in slot index N and slot index N+2. The UE may perform repeated transmission based on the highest frequency (e.g., highest PRB) in slot index N+1 and slot index N+3.

[0252] [Proposed method B]

[0253] When repeated transmission of PUCCH for Msg.4 HARQ-ACK is configured, how inter-slot frequency hopping is applied together with intra-slot frequency hopping

[0254] First, if the number of repeated transmissions is M (where M is an even number), the terminal can perform repeated transmissions as follows: The terminal can transmit for the first M / 2 times based on intra slot frequency hopping in the same order as the initially set order, and the terminal can transmit for the remaining M / 2 times based on intra slot frequency hopping in the opposite order to the initially set order.

[0255] That is, the initially set order may be such that the 1st hop is the lowest PRB and the 2nd hop is the highest PRB. In this case, the intra-slot frequency hopping order applied by the UE may be as follows: For the first M / 2 slots, the 1st hop may be the lowest PRB and the 2nd hop may be the highest PRB, as in the initially set order. For the remaining M / 2 slots, the 1st hop may be the highest PRB and the 2nd hop may be the lowest PRB. As shown in FIG. 7, for slot indexes N to N+1, the intra-slot frequency hopping order is lowest PRB → highest PRB. Contrary to the case of slot indexes N to N+1, for slot indexes N+2 to N+3, the intra-slot frequency hopping order is highest PRB → lowest PRB.

[0256] Second, when repeated transmission is applied, the terminal can perform repeated transmission as follows.

[0257] In the even slot (e.g., slot with even numbered index, slot index N, N+2 in FIG. 8), the UE can transmit based on the intra-slot frequency hopping operation in the same order as the initially set order.

[0258] In odd-th slots (e.g., slots with odd numbered indexes, slot indexes N+1 and N+3 in FIG. 8), the UE may transmit based on intra-slot frequency hopping, in the opposite order to the initially set order. That is, the initially set order may be such that the 1st hop is the lowest PRB and the 2nd hop is the highest PRB. In this case, the intra-slot frequency hopping order applied by the UE may be as follows: In even-th slots, the 1st hop may be the lowest PRB and the 2nd hop may be the highest PRB, the same as the initially set order. In odd-th slots, the 1st hop may be the highest PRB and the 2nd hop may be the lowest PRB. For example, as shown in FIG. 8, in slot index N and slot index N+2, the intra-slot frequency hopping order is lowest PRB → highest PRB. For slot index N+1 and slot index N+3, the order of intra-slot frequency hopping is highest PRB → lowest PRB.

[0259] Alternatively, when repeat transmission of PUCCH for Msg.4 HARQ-ACK is configured, intra and / or inter slot frequency hopping operation can be configured not to be supported. That is, when the base station is instructed on a specific parameter (e.g., the number of repeat transmissions or whether repeat transmission is available) for instructing repeat transmission of PUCCH for Msg.4 HARQ-ACK, the terminal can transmit PUCCH without frequency hopping. In this case, the terminal can perform PUCCH repeat transmission without frequency hopping at the frequency position initially configured by the base station.

[0260] Alternatively, when repeat transmission of PUCCH for Msg.4 HARQ-ACK is configured, intra and / or inter slot frequency hopping operation of the terminal can be enabled / disabled through the base station configuration. That is, the base station can instruct the terminal on specific parameters (e.g., the number of repeat transmissions or whether repeat transmission is available) for instructing repeat transmission of PUCCH for Msg.4 HARQ-ACK. The base station can configure / instruct the terminal on information regarding enable / disable of frequency hopping operation along with the parameters. In this case, the terminal can perform repeat transmission with or without adding intra and / or inter frequency hopping operation depending on the configuration / instruction of the base station.

[0261] The proposed methods, etc. may be configured / applied to other UL signals / channels such as PRACH / PUSCH / PUCCH. Furthermore, since an example of the proposed method described above may be included as one of the implementation methods of the present specification, it is obvious that it can be regarded as a type of proposed method, etc. Furthermore, the proposed methods, etc. described above may be implemented independently, or may be implemented in a combined (or merged) form of some of the proposed methods, etc. Rules may be defined so that the base station notifies the terminal of information on whether the proposed methods, etc. can be applied (or information on rules for the proposed methods, etc.) via a predefined signal (e.g., a physical layer signal or a higher layer signal). The higher layer may include one or more functional layers such as MAC, RLC, PDCP, RRC, and SDAP.

[0262] In practical terms, the operations of the base station / terminal according to the above-mentioned embodiments (e.g., the transmission of Msg4 HARQ-ACK information, an operation related to PUCCH) can be processed by the apparatus of FIG. 11 (e.g., processors 110, 210 of FIG. 11) described below.

[0263] In addition, the operations of the base station / terminal according to the above-mentioned embodiments (e.g., transmission of Msg4 HARQ-ACK information, operations related to PUCCH) may also be stored in a memory (e.g., 140, 240 in FIG. 11) in the form of commands / programs (e.g., instructions, executable code) for driving at least one processor (e.g., 110, 210 in FIG. 11).

[0264] Hereinafter, the above-mentioned embodiment will be described in detail in terms of the operation of a terminal and a base station with reference to Figures 9 and 10. The methods described below are merely divided for the convenience of explanation, and it goes without saying that some components of one method may be replaced with some components of another method or may be combined with each other and applied.

[0265] FIG. 9 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present specification.

[0266] As shown in FIG. 9, a method performed by a terminal in a wireless communication system according to one embodiment of the present specification may include a SIB receiving step (S910), a random access preamble transmitting step (S920), a random access response receiving step (S930), a PUSCH transmitting step (S940), a DCI receiving step (S950), a PDSCH receiving step (S960), and a HARQ-ACK information transmitting step (S970).

[0267] At S910, the terminal receives a system information block (SIB) from the base station.

[0268] According to one embodiment, a plurality of repetition factors may be set based on the SIB. That is, the SIB may include information regarding a plurality of repetition factors. For example, the plurality of repetition factors may include two or more of the following values: 2, 4, and / or 8.

[0269] According to one embodiment, the SIB may include a pucch-Resource Common parameter. Here, the term "pucch-ResourceCommon" is an example of a name for a parameter related to this embodiment, and is not intended to limit the technical concept of this embodiment to this name. For example, the "pucch-ResourceCommon parameter" may be replaced with a term such as "higher layer parameter," "first parameter," "specific parameter," or "parameter related to a PUCCH resource set." This embodiment may be based on proposed method A.

[0270] The pucch-ResourceCommon parameter may be associated with a PUCCH resource set before dedicated PUCCH resource configuration.

[0271] The PUCCH resource set associated with the PUCCH can be configured based on one row of a table (e.g., Table 2) where 16 PUCCH configurations are configured in 16 rows. In this case, the value of the pucch-ResourceCommon parameter can be set as only one of the indexes representing the configuration for PUCCH repetition. Specifically, among the indexes 0 to 15 representing the 16 rows, the value of the pucch-ResourceCommon parameter can be based on one of the indexes associated with a specific PUCCH format.

[0272] The specific PUCCH format may be PUCCH format 1. The value of the pucch-ResourceCommon parameter may be 11, 12, 13, 14, or 15.

[0273] Each of the PUCCH configurations may include at least one of: i) a PUCCH format; ii) a first symbol; iii) a number of symbols; iv) a physical resource block (PRB) offset; and / or v) a set of initial CS indexes.

[0274] At S920, the terminal transmits a random access preamble to the base station, which may be based on Msg1 of the Type-1 random access procedure (see Table 1).

[0275] At S930, the terminal receives a Random Access Response (RAR) from the base station, which may be based on Msg2 of the Type-1 random access procedure (see Table 1).

[0276] At S940, the terminal transmits a scheduled Physical Uplink Shared Channel (PUSCH) to the base station based on an uplink grant (UL grant) associated with the RAR. The PUSCH may be based on Msg3 of the Type-1 random access procedure.

[0277] At S950, the terminal receives downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) from the base station. At this time, the PDSCH may be associated with Msg4 of a random access procedure. That is, the PDSCH may include a contention resolution identity. For example, the DCI may be based on DCI format 1_0 in Table 1.

[0278] The DCI may include a Downlink Assignment Index (DAI) field.

[0279] At S960, the terminal receives the PDSCH from the base station.

[0280] At S970, the terminal transmits Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information related to the reception of the PDSCH to the base station. The HARQ-ACK information can be transmitted based on the repetition of a Physical Uplink Control Channel (PUCCH).

[0281] According to one embodiment, a repetition factor associated with the PUCCH among the plurality of repetition factors may be indicated based on the DAI field. This embodiment may be based on Proposed Method 1, which will be described in detail below.

[0282] The repetition factor associated with the PUCCH can be indicated based on a codepoint based on at least one of i) the first bit of the DAI field and / or ii) the second bit of the DAI field.

[0283] The DAI field may be a 2-bit field, the first bit may be a most significant bit (MSB) or a least significant bit (LSB) of the DAI field, and the second bit may be a least significant bit (LSB) or an most significant bit (MSB) of the DAI field.

[0284] The code point can be determined by 1) a number of bits based on the number of the plurality of repetition factors, or 2) a predefined number of bits (regardless of the number of the plurality of repetition factors). Hereinafter, embodiments according to 1) and 2) will be described in order.

[0285] According to one embodiment, the code point may be determined based on the number of the plurality of repetition factors. In this case, the code point when the number of the plurality of repetition factors is 2 may be different from the code point when the number of the plurality of repetition factors is greater than 2. This will be described in detail below.

[0286] If the number of the repetition factors is 2, the code point may be one of two code points based on the first bit or the second bit. As an example, the code point may be one of code points (0, 1) based on the LSB (or MSB) of the DAI field.

[0287] Each of the two code points can be associated with a repeat factor determined based on the order of the repeat factors. A specific example will be described assuming that two repeat factors 2 and 4 are set / indicated in the order {2, 4}. The two code points 0 and 1 can be mapped to the two repeat factors 2 and 4 as follows:

[0288] As an example, the first code point 0 (or the second code point 1) may be mapped to 2, and the second code point 1 (or the first code point 0) may be mapped to 4. In other words, based on the DAI field whose LSB is 0, the first repeat factor 2 (or the second repeat factor 4) of the two repeat factors 2 and 4 may be indicated. Based on the DAI field whose LSB is 1, the second repeat factor 4 (or the first repeat factor 2) of the two repeat factors 2 and 4 may be indicated.

[0289] If the number of the repetition factors is greater than 2, the code point may be one of four code points based on the first bit and the second bit. As a specific example, the code point may be one of code points (00, 01, 10, 11) based on two bits of the DAI field.

[0290] Each of the four code points can be associated with a repeat factor determined based on the order of the repeat factors. A specific example will be described assuming that three repeat factors, 2, 4, and 8, are set / indicated in the order {2, 4, 8}. The four code points, 00, 01, 10, and 11, can be mapped to the three repeat factors, 2, 4, and 8, as follows:

[0291] As an example, the first code point 00 (or the fourth code point 11) can be mapped to 2, the second code point 01 (or the third code point 10) can be mapped to 4, the third code point 10 (or the second code point 01) can be mapped to 8, and the fourth code point 11 (or the first code point 00) can be unused (i.e., 11 or 00 corresponds to the reserved state in proposed method 1 above).

[0292] In other words, if the value of the DAI field is 00 (or 11), the first repeat factor of 2 may be indicated among the three repeat factors of 2, 4, and 8. If the value of the DAI field is 01 (or 10), the second repeat factor of 4 may be indicated among the three repeat factors of 2, 4, and 8. If the value of the DAI field is 10 (or 01), the third repeat factor of 8 may be indicated among the three repeat factors of 2, 4, and 8.

[0293] Based on the ascending or descending order of the code points (1 / 2 bit code points) (e.g., 00 → 11 or 11 → 00), the code points can be mapped to each repetition factor (2, 4, or 8) in the order in which the repetition factors are set (e.g., {2, 4, 8}).

[0294] According to one embodiment, the code point may be determined by a predefined number of bits (regardless of the number of the plurality of repetition factors). Specifically, the code point may be one of four code points based on the first bit and the second bit. As a specific example, the code point may be one of code points (00, 01, 10, 11) based on two bits of the DAI field. The mapping between the code points and the plurality of repetition factors may be applied in the same manner as described above.

[0295] Each of the four code points can be associated with a repeat factor determined based on the order of the repeat factors. A specific example will be described assuming that two repeat factors 2 and 4 are set / indicated in the order {2, 4}. The four code points 00, 01, 10, and 11 can be mapped to the two repeat factors 2 and 4 as follows:

[0296] As an example, the first code point 00 (or the fourth code point 11) can be mapped to 2, the second code point 01 (or the third code point 10) can be mapped to 4, and the third code point 10 and the fourth code point 11 (or the second code point 01 and the first code point 00) can be unused (i.e., 10 and 11 (or 01 and 00) correspond to the reserved state in the proposed method 1 described above).

[0297] In other words, when the value of the DAI field is 00 (or 11), the first repetition factor of 2 out of two repetition factors of 2 and 4 can be indicated. When the value of the DAI field is 01 (or 10), the second repetition factor of 4 out of two repetition factors of 2 and 4 can be indicated.

[0298] According to one embodiment, intra-slot frequency hopping may be applied to the PUCCH repetition. For example, the frequency hopping and associated pattern may be based on one of the embodiments shown in FIGS. 4, 7, and 8.

[0299] The operations based on S910 to S970 described above can be realized by the apparatus of Fig. 11. For example, the terminal 200 can control one or more transceivers 230 and / or one or more memories 240 to perform the operations based on S910 to S970.

[0300] In the method, some of the steps S910 to S970 described above may be omitted. For example, the method may include steps S910, S950, S960, and S970.

[0301] The above-mentioned embodiments will be specifically described below in terms of the operation of the base station.

[0302] S1010 to S1070 described below correspond to S910 to S970 described in Fig. 9. In consideration of the correspondence, duplicated explanations will be omitted. That is, specific explanations of the base station operations described below can be replaced with the explanations / embodiments of Fig. 9 corresponding to the operations. As an example, the explanations / embodiments of S910 to S970 in Fig. 9 can also be applied to the base station operations of S1010 to S1070 described below.

[0303] FIG. 10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0304] As shown in FIG. 10, a method performed by a base station in a wireless communication system according to another embodiment of the present specification may include an SIB transmission step (S1010), a random access preamble reception step (S1020), a random access response transmission step (S1030), a PUSCH reception step (S1040), a DCI transmission step (S1050), a PDSCH transmission step (S1060), and a HARQ-ACK information reception step (S1070).

[0305] In S1010, the base station transmits a system information block (SIB) to the terminal.

[0306] At S1020, the base station receives a random access preamble from the terminal, which may be based on Msg1 of the Type-1 random access procedure (see Table 1).

[0307] At S1030, the base station sends a Random Access Response (RAR) to the terminal, which may be based on Msg2 of the Type-1 random access procedure (see Table 1).

[0308] At S1040, the base station receives a scheduled physical uplink shared channel (PUSCH) from the terminal based on an uplink grant (UL grant) associated with the RAR. The PUSCH may be based on Msg3 of the Type-1 random access procedure.

[0309] At S1050, the base station transmits downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) to the terminal.

[0310] In S1060, the base station transmits the PDSCH to the terminal.

[0311] At S1070, the base station receives Hybrid Automatic Repeat reQuest-ACKnowledgment (HARQ-ACK) information related to the reception of the PDSCH from the terminal. The HARQ-ACK information may be received based on repetition of a Physical Uplink Control Channel (PUCCH).

[0312] The operations based on S1010 to S1070 described above can be realized by the device of Fig. 11. For example, the base station 100 can control one or more transceivers 130 and / or one or more memories 140 to perform the operations based on S1010 to S1070.

[0313] In the method, some of the steps S1010 to S1070 described above may be omitted. For example, the method may include steps S1010, S1050, S1060, and S1070.

[0314] An apparatus to which the embodiments of the present specification can be applied (an apparatus that implements the methods / operations according to the embodiments of the present specification) will be described below with reference to FIG.

[0315] FIG. 11 is a diagram showing the configurations of the first device and the second device according to the embodiment of the present specification.

[0316] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0317] The processor 110 performs baseband-related signal processing and may include an upper layer processor 111 and a physical layer processor 115. The upper layer processor 111 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processor 115 may process operations of the PHY layer. For example, if the first device 100 is a base station device in base station-terminal communication, the physical layer processor 115 may perform uplink receive signal processing, downlink transmit signal processing, etc. For example, if the first device 100 is a first terminal device in terminal-terminal communication, the physical layer processor 115 may perform downlink receive signal processing, uplink transmit signal processing, sidelink transmit signal processing, etc. In addition to performing baseband-related signal processing, the processor 110 may also control the overall operation of the first device 100.

[0318] The antenna unit 120 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 130 may include an RF (Radio Frequency) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110, as well as software, an operating system, applications, etc. related to the operation of the first device 100, and may also include components such as buffers.

[0319] The processor 110 of the first device 100 can be configured to implement the operation of a base station in base station-terminal communication (or the operation of a first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0320] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0321] The processor 210 performs baseband-related signal processing and may include an upper layer processing unit 211 and a physical layer processing unit 215. The upper layer processing unit 211 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 215 may process operations of the PHY layer. For example, if the second device 200 is a terminal device in base station-terminal communication, the physical layer processing unit 215 may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, if the second device 200 is a second terminal device in terminal-terminal communication, the physical layer processing unit 215 may perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor 210 may also control the overall operation of the second device 200.

[0322] The antenna unit 220 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210, as well as software, an operating system, applications, etc. related to the operation of the second device 200, and may also include components such as buffers.

[0323] The processor 210 of the second device 200 can be configured to implement the operation of a terminal in base station-terminal communication (or the operation of a second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0324] In the operation of the first device 100 and the second device 200, the matters described in the examples of the present disclosure regarding the base station and terminal in base station-terminal communication (or the first terminal and second terminal in terminal-terminal communication) can be similarly applied, and duplicate explanations will be omitted.

[0325] Here, the wireless communication technology implemented by the devices 100 and 200 of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology is an example of a Low Power Wide Area Network (LPWAN) technology, and can be implemented by standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names.

[0326] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above names.

[0327] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and a Low Power Wide Area Network (LPWAN), which consider low-power communication, but is not limited to the aforementioned names. For example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.

Claims

1. 1. A method performed by a terminal in a wireless communication system, comprising: receiving a System Information Block (SIB); transmitting a random access preamble; receiving a Random Access Response (RAR); transmitting a scheduled physical uplink shared channel (PUSCH) based on an uplink grant (UL grant) associated with the RAR; Receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; receiving the PDSCH; transmitting Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a Downlink Assignment Index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The method, wherein the code point is determined based on a number of the plurality of repetition factors.

2. The DAI field is a 2-bit field, 2. The method of claim 1, wherein the first bit is a most significant bit (MSB) or a least significant bit (LSB) of the DAI field, and the second bit is a least significant bit (LSB) or an MSB of the DAI field.

3. Based on the number of the plurality of repetition factors being 2, 2. The method of claim 1, wherein the code point is one of two code points based on the first bit or the second bit.

4. 4. The method of claim 3, wherein each of the two code points is associated with a respective repeat factor determined based on an order of the plurality of repeat factors.

5. Based on the number of the plurality of repetition factors being greater than 2, 2. The method of claim 1, wherein the code point is one of four code points based on the first bit and the second bit.

6. 6. The method of claim 5, wherein each of the four code points is associated with a respective repeat factor determined based on an order of the plurality of repeat factors.

7. The SIB includes a pucch-ResourceCommon parameter; The pucch-ResourceCommon parameter is associated with a PUCCH resource set before dedicated PUCCH resource configuration, The PUCCH resource set associated with the PUCCH is configured based on one row of a table having 16 rows each including 16 PUCCH configurations; The method of claim 1, wherein the value of the pucch-ResourceCommon parameter is based on one of the indexes 0 to 15 representing the 16 rows, the index being associated with a specific PUCCH format.

8. The specific PUCCH format is PUCCH format 1, 8. The method of claim 7, wherein the value of the pucch-ResourceCommon parameter is 11, 12, 13, 14, or 15.

9. 8. The method of claim 7, wherein each of the PUCCH configurations includes at least one of: i) a PUCCH format; ii) a first symbol; iii) a number of symbols; iv) a physical resource block (PRB) offset; and / or v) a set of initial CS indexes.

10. 8. The method of claim 7, wherein intra-slot frequency hopping is applied to the PUCCH repetition.

11. 1. A terminal operating in a wireless communication system, comprising: one or more transceivers; one or more processors; one or more memories operatively connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations; Equipped with The above operations etc. receiving a System Information Block (SIB); transmitting a random access preamble; receiving a Random Access Response (RAR); transmitting a scheduled physical uplink shared channel (PUSCH) based on an uplink grant (UL grant) associated with the RAR; Receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; receiving the PDSCH; transmitting Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a downlink assignment index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The terminal is characterized in that the code point is determined based on the number of the plurality of repetition factors.

12. 1. An apparatus comprising one or more memories and one or more processors operatively coupled to the one or more memories, the one or more memories contain instructions that, when executed by the one or more processors, configure the one or more processors to perform actions; The above operations etc. receiving a System Information Block (SIB); transmitting a random access preamble; receiving a Random Access Response (RAR); transmitting a scheduled physical uplink shared channel (PUSCH) based on an uplink grant (UL grant) associated with the RAR; Receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; receiving the PDSCH; transmitting Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a Downlink Assignment Index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The code point is determined based on a number of the plurality of repetition factors.

13. One or more non-transitory computer-readable media storing one or more instructions, one or more instructions executable by one or more processors to configure the one or more processors to perform an operation; The above operations etc. receiving a System Information Block (SIB); transmitting a random access preamble; receiving a Random Access Response (RAR); transmitting a scheduled physical uplink shared channel (PUSCH) based on an uplink grant (UL grant) associated with the RAR; Receiving downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; receiving the PDSCH; transmitting Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is transmitted based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a Downlink Assignment Index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The code point is determined based on a number of the plurality of repetition factors.

14. 1. A method performed by a base station in a wireless communication system, comprising: transmitting a System Information Block (SIB); receiving a random access preamble; sending a Random Access Response (RAR); receiving a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR; Transmitting downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; transmitting the PDSCH; receiving Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is received based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a Downlink Assignment Index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The method, wherein the code point is determined based on a number of the plurality of repetition factors.

15. 1. A base station operating in a wireless communication system, comprising: one or more transceivers; one or more processors; one or more memories operatively connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations; Equipped with The above operations etc. transmitting a System Information Block (SIB); receiving a random access preamble; sending a Random Access Response (RAR); receiving a Physical Uplink Shared Channel (PUSCH) scheduled based on an uplink grant (UL grant) associated with the RAR; Transmitting downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), the PDSCH including a contention resolution identity; transmitting the PDSCH; receiving Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information associated with reception of the PDSCH; Including, The HARQ-ACK information is received based on repetition of a Physical Uplink Control Channel (PUCCH), A plurality of repetition factors are set based on the SIB; The DCI includes a Downlink Assignment Index (DAI) field; A repetition factor associated with the PUCCH is indicated among the plurality of repetition factors based on the DAI field; The repetition factor associated with the PUCCH is indicated based on a codepoint based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field; The base station, wherein the code point is determined based on the number of the plurality of repetition factors.

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