Method and apparatus for transmitting and receiving HARQ-ACK information in wireless communication system

Abstract

According to an embodiment of the present invention, a method performed by a terminal comprises the steps of: receiving an SIB; sending a random access lead code; receiving a random access response; the PUSCH is transmitted; receiving DCI (Downlink Control Information) for scheduling the PDSCH; receiving a PDSCH (physical downlink shared channel); and transmitting the HARQ-ACK information related to the reception of the PDSCH (Physical Downlink Shared Channel). The HARQ-ACK information is transmitted on the basis of the repetition of the PUCCH. The DCI includes a downlink assignment index (DAI) field. A repetition factor associated with the PUCCH is indicated based on a code point that is 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 disclosure relates to methods and apparatus for sending and receiving HARQ-ACK information in a wireless communication system. Background Art

[0002] Mobile communication systems have evolved to provide voice services while ensuring user activity. Mobile communication systems are expanding their services from voice only to data. The current surge in data traffic is exhausting resources, and user demand for higher data rate services brings the need for more advanced mobile communication systems.

[0003] The next generation of mobile communication systems needs to meet requirements such as handling the explosive growth of data traffic, significantly increasing the transmission rate for each user, working with a large number of connected devices, and supporting very low end-to-end latency and high energy efficiency. To this end, various research efforts are being conducted on various technologies, such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking.

[0004] The following actions are introduced based on the standardization discussion.

[0005] For PUCCH repetition related to HARQ-ACK information for Msg4, the base station can configure multiple repetition factors to be used for user equipment (UE) in the corresponding cell. Afterwards, the base station can dynamically indicate the necessary repetition factor to the UE through the DAI field of the DCI. Summary of the invention

[0006] Technical issues

[0007] According to the existing method, the DAI field (2 bits) is used to indicate the downlink assignment index. Therefore, in order to indicate one of the configured repetition factors to the UE through the DAI field, it is necessary to specifically define the interpretation method of the DAI field. According to the existing method, the following problems arise.

[0008] There may be ambiguity as to how the UE should interpret the DAI field based on the number of configured repetition factors. For example, there may be ambiguity as to which of the following 1) to 4) the UE should use to determine the repetition factor.

[0009] 1) The LSB of the DAI field indicates one of the configured repetition factors based on the number of configured repetition factors

[0010] 2) The MSB of the DAI field indicates one of the configured repetition factors based on the number of configured repetition factors

[0011] 3) The LSB and MSB of the DAI field indicate one of the configured repetition factors based on the number of configured repetition factors

[0012] 4) The LSB and MSB of the DAI field indicate one of the configured repetition factors

[0013] Depending on which of the above 1) to 4) is used to interpret the DAI field, the repetition factor indicated by the base station to the UE and the repetition factor determined by the UE based on the DAI field may be different. For example, if the repetition factor determined by the UE based on the DAI field is lower than the repetition factor indicated by the base station, the HARQ-ACK information may not be properly sent 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 indicated by the base station, even if the HARQ-ACK information has been sent to the base station, unnecessary signaling overhead may still occur.

[0014] The object of the present invention is to provide a method for solving the above-mentioned problems.

[0015] The technical objectives to be achieved by the present disclosure are not limited to those described above only by way of example, and other technical objectives not mentioned can be clearly understood from the following description by those skilled in the art to which the present disclosure pertains.

[0016] Technical Solution

[0017] According to an embodiment of the present disclosure, a method performed by a user equipment in a wireless communication system includes: receiving a system information block (SIB), sending a random access preamble, receiving a random access response (RAR), sending a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant related to the RAR, receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), receiving the PDSCH, and sending hybrid automatic repeat request-acknowledgement (HARQ-ACK) information related to the reception of the PDSCH.

[0018] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0019] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0020] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0021] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0022] The code point is determined based on the number of multiple repetition factors.

[0023] The DAI field is a 2-bit field. The first bit may be the most significant bit (MSB) or the least significant bit (LSB) of the DAI field, and the second bit is the LSB or MSB of the DAI field.

[0024] Based on the number of multiple repetition factors being 2, the code point can be one of two code points based on the first bit or the second bit.

[0025] Each of the two code points may be associated with each repetition factor determined based on an order of the plurality of repetition factors.

[0026] Based on the number of multiple repetition factors being greater than 2, the code point can be one of four code points based on the first bit and the second bit.

[0027] Each of the four code points may be associated with each repetition factor determined based on an order of the plurality of repetition factors.

[0028] The SIB may include the parameter pucch-ResourceCommon.

[0029] The parameter pucch-ResourceCommon may be associated with a PUCCH resource set before a dedicated PUCCH resource configuration.

[0030] A PUCCH resource set associated with a PUCCH may be configured based on a row of a table in which 16 rows constitute 16 PUCCH configurations.

[0031] Among indices 0 to 15 representing 16 rows, the value of the parameter pucch-ResourceCommon may be based on one of the indices associated with a specific PUCCH format.

[0032] The specific PUCCH format may be PUCCH format 1. The value of the parameter pucch-ResourceCommon may be 11, 12, 13, 14 or 15.

[0033] Each of the PUCCH configurations may include at least one of: i) a PUCCH format, ii) a first symbol, iii) the number of symbols, iv) a physical resource block (PRB) offset, and / or v) a set of initial cyclic shift (CS) indices.

[0034] Intra-slot frequency hopping may be applied to the repetition of the PUCCH.

[0035] According to another embodiment of the present disclosure, a user equipment (UE) operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories, which are operably connected to the one or more processors and store instructions, which configure the one or more processors to perform operations based on execution by the one or more processors.

[0036] The operations include receiving a system information block (SIB), sending a random access preamble, receiving a random access response (RAR), sending a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant associated with the RAR, receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), receiving the PDSCH, and sending hybrid automatic repeat request-acknowledgement (HARQ-ACK) information associated with the reception of the PDSCH.

[0037] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0038] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0039] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0040] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0041] The code point is determined based on the number of multiple repetition factors.

[0042] According to another embodiment of the present disclosure, an apparatus includes one or more memories, and one or more processors operatively connected to the one or more memories.

[0043] The one or more memories include instructions that, upon execution by the one or more processors, configure the one or more processors to perform operations.

[0044] The operations include receiving a system information block (SIB), sending a random access preamble, receiving a random access response (RAR), sending a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant associated with the RAR, receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), receiving the PDSCH, and sending hybrid automatic repeat request-acknowledgement (HARQ-ACK) information associated with the reception of the PDSCH.

[0045] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0046] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0047] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0048] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0049] The code point is determined based on the number of multiple repetition factors.

[0050] According to another embodiment of the present disclosure, one or more non-transitory computer-readable media store one or more instructions.

[0051] The one or more instructions executable by the one or more processors configure the one or more processors to perform operations.

[0052] The operations include receiving a system information block (SIB), sending a random access preamble, receiving a random access response (RAR), sending a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant associated with the RAR, receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), receiving the PDSCH, and sending hybrid automatic repeat request-acknowledgement (HARQ-ACK) information associated with the reception of the PDSCH.

[0053] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0054] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0055] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0056] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0057] The code point is determined based on the number of multiple repetition factors.

[0058] According to another embodiment of the present disclosure, a method performed by a base station in a wireless communication system includes: sending 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 (UL) grant related to the RAR, sending downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), sending the PDSCH, and receiving hybrid automatic repeat request-acknowledgement (HARQ-ACK) information related to the reception of the PDSCH.

[0059] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0060] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0061] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0062] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0063] The code point is determined based on the number of multiple repetition factors.

[0064] According to another embodiment of the present disclosure, a base station operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories, wherein the one or more memories are operably connected to the one or more processors and store instructions, which configure the one or more processors to perform operations based on execution by the one or more processors.

[0065] The operations include sending 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 (UL) grant associated with the RAR, sending downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH), sending the PDSCH, and receiving hybrid automatic repeat request-acknowledgement (HARQ-ACK) information associated with reception of the PDSCH.

[0066] The PDSCH includes a contention resolution identification (ID). The HARQ-ACK information is transmitted based on repetition of the physical uplink control channel (PUCCH).

[0067] Multiple repetition factors are configured based on SIB.DCI includes a Downlink Assignment Index (DAI) field.

[0068] A repetition factor related to the PUCCH among multiple repetition factors is indicated based on the DAI field.

[0069] The repetition factor associated with the PUCCH is indicated based on a code point based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0070] The code point is determined based on the number of multiple repetition factors.

[0071] Beneficial Effects

[0072] According to an embodiment of the present disclosure, a code point of a DAI field for indicating a repetition factor is determined based on the number of repetition factors.

[0073] Accordingly, since one of the configured repetition factors is indicated based on an existing field (DAI field) of the DCI, the implementation complexity required to dynamically indicate one of the configured repetition factors may be minimized.

[0074] The ambiguity problem of whether the code point of the DAI field indicating the repetition factor from the UE perspective is a code point based on the LSB (or MSB) or a code point based on the LSB and MSB (2 bits) can be solved.

[0075] In addition, the problem that the repetition factor determined by the UE based on the DAI field is different from the repetition factor instructed by the base station to use by the UE due to ambiguity in the interpretation of the DAI field can be prevented. The problem that HARQ-ACK information is not sent properly or causes unnecessary signaling overhead can be solved.

[0076] Since only 1 bit of the DAI field can be used to indicate the repetition factor based on the number of configured repetition factors, embodiments can minimize instances where the available DAI is limited. As a specific example, when 2 bits of the DAI field are used, the available DAI for indicating a particular 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 1 bit (LSB) of the DAI field is used, two of the four indexes can be used to indicate a particular repetition factor (e.g., 01 or 11 out of 00, 01, 10, and 11).

[0077] Effects that can be achieved by using the present disclosure are not limited to the effects described above by way of example only, and those skilled in the art to which the present disclosure belongs will more clearly understand other effects and advantages of the present disclosure from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 Shown are physical channels and transmission of common signals used in the 3GPP system.

[0079] Figure 2 The process of acquiring system information (SI) is shown.

[0080] Figure 3 The random access procedure is shown.

[0081] Figures 4 to 8 Frequency hopping associated with repeated transmissions according to an embodiment of the present disclosure is shown.

[0082] Fig. 9 is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present disclosure.

[0083] Fig.10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0084] Fig.11 The configurations of the first device and the second device according to an embodiment of the present disclosure are shown. DETAILED DESCRIPTION

[0085] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following detailed description in conjunction with the accompanying drawings is intended to describe example embodiments of the present disclosure, but does not represent the only embodiment of the present disclosure. The following detailed description includes specific details to convey a thorough understanding of the present disclosure. However, it will be readily understood by those skilled in the art that embodiments of the present disclosure can be practiced even without these details.

[0086] In some cases, to avoid conceptual ambiguity, well-known structures or devices may be omitted or shown in block diagrams, while focusing on the core features of each structure and device.

[0087] In the following, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the sender may be part of a base station, and the receiver may be part of a terminal. In the uplink, the sender may be part of a terminal, and the receiver may be part of a base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. The base station (BS) may be replaced with terms including a fixed station, a node B, an evolved node B (eNB), a next generation node B (gNB), a base transceiver system (BTS), an access point (AP), a network (5G network), an AI system, a roadside unit (RSU), a vehicle, a robot, an unmanned aerial vehicle (UAV), an augmented reality (AR) device, a virtual reality (VR) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced by terms including user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine type communication (MTC) device, machine to machine (M2M) device and device to device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc.

[0088] [NR NTN]

[0089] In order to ensure wider coverage or provide wireless communication services in places where it is difficult to install wireless communication base stations, the use of NR non-terrestrial network (NTN) or LTE NTN services is being considered. Although NR and LTE services, which are existing terrestrial network (TN) services, have installed base stations on the ground and provide wireless communication services to UEs, NTN services provide wireless communication services to UEs by installing base stations in non-terrestrial locations such as satellites (geostationary orbit, low orbit, medium orbit, etc.), aircraft, unmanned aerial vehicles, and drones instead of installing base stations on the ground. It also includes scenarios such as high altitude platform stations (HAPS) and air-to-ground (ATG).

[0090] Physical channels and general signaling

[0091] Figure 1The physical channels and general signal transmission used in the 3GPP system are shown. In the wireless communication system, the UE receives information from the eNB through the downlink (DL), and the UE sends information to the eNB through the uplink (UL). The information sent and received by the eNB and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information sent and received by the eNB and the UE.

[0092] When the UE is powered on or newly enters a cell, the UE performs an initial cell search operation, such as synchronization with the eNB (S101). To this end, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the eNB, and synchronize with the eNB and obtain information such as a cell ID. Thereafter, the UE may receive a physical broadcast channel (PBCH) from the eNB and obtain intra-cell broadcast information. In addition, the UE receives a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel status.

[0093] The UE that has completed the initial cell search receives a physical downlink control channel (PDCCH) and receives a physical downlink shared channel (PDSCH) according to information loaded on the PDCCH to acquire more specific system information (S102).

[0094] In addition, when there is no radio resource to first access the eNB or for signal transmission, the UE may perform a random access procedure (RACH) to the eNB (S103 to S106). To this end, the UE may send a specific sequence as a preamble through a physical random access channel (PRACH) (S103 and S105), and receive a response message (random access response (RAR) message) to the preamble through a PDCCH and a corresponding PDSCH. In the case of a contention-based RACH, a contention resolution procedure (S106) may be additionally performed.

[0095] The UE performing the above process 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 process. Specifically, the UE may receive downlink control information (DCI) via the PDCCH. Here, the DCI may include control information such as resource allocation information for the UE, and the format may be applied differently depending on the purpose of use.

[0096] In addition, the control information sent by the UE to the eNB through the uplink or received by the UE from the eNB may include a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. The UE may send control information such as CQI / PMI / RI through the PUSCH and / or the PUCCH.

[0097] Synchronization Signal Block (SSB) transmission and related operations

[0098] Figure 2 The process of acquiring system information (SI) is shown.

[0099] The UE may acquire AS- / NAS-information through the SI acquisition procedure. The SI acquisition procedure may be applied to UEs in RRC_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state.

[0100] SI is divided into a master information block (MIB) and multiple system information blocks (SIBs). SI other than MIB may be referred to as remaining minimum system information (RMSI). This is described in detail below.

[0101] -MIB includes information / parameters related to SIB1 (SystemInformationBlockType1) reception and is sent on the PBCH of SSB. In the initial cell selection, the UE assumes that the half frame with SSB repeats with a period of 20ms. The UE can check whether there is a control resource set (CORESET) for the Type0-P DCCH common search space based on the MIB. The Type0-P DCCH common search space is a PDCCH search space and is used to send a PDCCH for scheduling SI messages. If there is a Type0-P DCCH common search space, the UE can determine (i) multiple consecutive RBs and one or more consecutive symbols constituting the CORESET, and (ii) the PDCCH timing (i.e., the time domain position for PDCCH reception) based on the information in the MIB (e.g., pdcch-ConfigSIB1). If there is no Type0-P DCCH common search space, pdcch-ConfigSIB1 provides information on the frequency position where SSB / SIB1 exists and the frequency range where SSB / SIB1 does not exist.

[0102] -SIB1 contains information related to the availability and scheduling (e.g., transmission period, SI-window size) of the remaining SIBs (hereinafter referred to as SIBx, where x is an integer of 2 or greater). For example, SIB1 may indicate whether SIBx is broadcast periodically or whether SIBx is provided through an on-demand scheme as requested by the UE. If SIBx is provided through an on-demand scheme, SIB1 may include information required for the UE to perform an SI request. SIB1 is transmitted on the PDSCH, the PDCCH that schedules SIB1 is transmitted through the Type0-P DCCH common search space, and SIB1 is transmitted on the PDSCH indicated by the PDCCH.

[0103] - SIBx is included in the SI message and transmitted on the PDSCH. Each SI message is transmitted within a time window (ie, SI-window) that occurs periodically.

[0104] Figure 3 The random access procedure is shown.

[0105] Figure 3 (a) shows the contention-based RACH process, and Figure 3 (b) shows a contention-free RACH process.

[0106] The following describes MSG1 transmission.

[0107] The subcarrier spacing for MSG1 is configured in the RACH configuration and provided in the handover command regarding the contention-free RA procedure for handover.

[0108] Preamble indexes used for contention-based random access (CBRA) and contention-free random access (CFRA) are continuously mapped to one SSB in one RACH transmission opportunity.

[0109] CBRA: The association between SS blocks (SSBs) within an SS burst set and a subset of RACH resources and / or preamble indices is configured by a parameter set in the RMSI.

[0110] CFRA: The UE may be configured to send multiple MSG1s through dedicated multiple RACH transmission opportunities in the time domain before the monitored RAR window ends.

[0111] Furthermore, the association between the CFRA preamble and the SSB is reconfigured via UE-specific RRC.

[0112] 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).

[0113] The type 1 random access procedure may include sending a random access preamble (Msg1) in a physical random access channel (PRACH), receiving a random access response (RAR) (Msg2), sending a PUSCH (Msg3) scheduled by a UL grant of the RAR, and a PDSCH (Msg4) for contention resolution. If the random access procedure is a contention-free random access (CFRA), Msg3 transmission and Msg4 reception are omitted.

[0114] The type 2 random access procedure may include sending a random access preamble and PUSCH (MsgA) and receiving a RAR (MsgB).

[0115] Table 1 below shows operations related to the random access procedure.

[0116] [Table 1]

[0117]

[0118] The definition / operation of the embodiments described later may be clarified with reference to the configuration / definition / operation based on the above Table 1. For example, Msg4 HARQ-ACK may indicate the HARQ-ACK information of Table 1.

[0119] The above content may be applied in combination with the method proposed in the present disclosure described later, or may be supplemented to clarify the technical features of the method proposed in the present disclosure.

[0120] If the UE successfully receives the Msg.4PDSCH sent from the base station while performing the RACH process in the initial access step, the UE sends HARQ-ACK information (see Table 1). In this case, the resources required for the UE to send the PUCCH for Msg.4HARQ-ACK are predefined as the initial PUCCH resource set. The base station can select one of the defined initial PUCCH resource sets. Specifically, the base station can configure / indicate one of the initial PUCCH resource sets to the UE via RRC signaling. The base station indicates a PUCCH resource in the indicated PUCCH resource set to the UE. Specifically, the base station indicates the PUCCH resource to the UE based on the specific field of the DCI used to schedule Msg.4HARQ-ACK and the CCE index of the DCI. In this case, the initial PUCCH resource set used is defined in Table 2 below.

[0121] [Table 2]

[0122]

[0123] The signals / channels considered in the existing NR system may not operate properly because they do not meet the target SNR in a specific environment (e.g., NTN). Specifically, in the NTN environment, the PUCCH format defined in the initial PUCCH resource set may need to be enhanced, such as repeated transmission. The present disclosure proposes a method to be considered when applying repeated transmission to a PUCCH format (defined in the initial PUCCH resource set).

[0124] Method for setting the number of repeated transmissions of the initial PUCCH resource set

[0125] [Proposed method 1]

[0126] The base station can configure / indicate multiple (e.g., K) sets of repetition times (applicable to the initial PUCCH resource set) to the UE via high-level signaling (e.g., SIB, etc.). The base station can configure / indicate the actual number of repetitions to the UE through other indication methods (e.g., DCI, etc.). The proposed method is described in detail below.

[0127] The base station can configure the set of K repetition times that the initial PUCCH resource set can have and the parameter (e.g., pucch-ResourceCommon) that determines the index of the initial PUCCH resource set to the UE via high-level signaling (e.g., SIB, etc.). Thereafter, the base station can configure / indicate to the UE the repetition times to be applied / used for the actual initial PUCCH resource set by scheduling a specific field of the DCI of Msg.4PDSCH (e.g., the downlink assignment index (DAI) field).

[0128] For example, to select one of the K repetitions, the L of the DCI bits may be used to configure / indicate the number of PUCCH repetitions. For example, some higher bit fields of the MCS field of the DCI may be used to configure / indicate the number of PUCCH repetitions.

[0129] For example, the number of repetitions to be used for / applied to the initial PUCCH resource set may be configured / indicated based on Msg.4PDSCH instead of DCI scheduling the Msg.4PDSCH. In other words, the Msg.4PDSCH may include information about the number of repetitions.

[0130] For example, the number of repetitions to be used for / applied to the initial PUCCH resource set may be configured / indicated to the UE via a DCI that schedules a PDSCH on which Msg.2RAR is forwarded or a PDSCH on which Msg.2RAR is forwarded.

[0131] In this example, 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. For example, the K number of repetitions may be {2, 4, 8}.

[0132] The base station may configure / indicate candidates for the repetition transmission factor (or repetition factor) of the PUCCH for Msg.4 HARQ-ACK transmission via high-level signaling (e.g., SIB, etc.) to the UE. For example, the base station may configure / indicate multiple candidates in {1, 2, 4, 8} to the UE based on the SIB. The base station may indicate one of the configured / indicated repetition factor candidates to the UE via a specific DCI field (e.g., MCS field, downlink assignment index (DAI) field, HARQ process number (HPN) field, etc.).

[0133] The following embodiments may be considered to determine the size of the bit field used to indicate the PUCCH repetition transmission factor (or repetition factor) within the DCI format.

[0134] According to an embodiment, the bit field size of the DCI for indicating the repetition factor may be predefined (e.g., 2 bits), regardless of the number of repetition factors configured for the UE. Specifically, regardless of how many of {1, 2, 4, 8} the base station indicates via high-level signaling (e.g., SIB, etc.), the 2 bits of a specific field may always be used to indicate the repetition factor of the PUCCH for Msg.4 HARQ-ACK transmission.

[0135] It can be assumed that the base station indicates two of {1, 2, 4, 8} to the UE via high-level signaling (e.g., SIB, etc.). The value configured / indicated by the base station may be {a1, a2}. a1 may be indicated by the value of the state 00 (or 10) of the corresponding 2-bit field, a2 may be indicated by the value of the state 01 (or 11) of the corresponding 2-bit field, and the remaining states 10 and 11 (or 00 and 01) may be set to reserved states.

[0136] For ease of explanation, the present disclosure has described the value of the bit field of DCI as 00 to 11, but the value of the bit field of DCI may be referred to as a code point. Specifically, the code point of the 2-bit field of DCI may be "00", "01", "10" or "11". The code point based on the 2-bit field of DCI may be "00", "01", "10" and "11".

[0137] It can be assumed that the base station indicates three of {1, 2, 4, 8} to the UE via high-level signaling (e.g., SIB, etc.). The value configured / indicated by the base station can be {a1, a2, a3}. a1 can be indicated by the value of the state 00 (or 11) of the corresponding 2-bit field, a2 can be indicated by the value of the state 01 (or 10) of the corresponding 2-bit field, a3 can be indicated by the value of the state 10 (or 01) of the corresponding 2-bit field, and the remaining state 11 (or 00) can be set to a reserved state.

[0138] It can be assumed that the base station indicates four of {1, 2, 4, 8} to the UE via high-level signaling (e.g., SIB, etc.). The values ​​configured / indicated by the base station can be {a1, a2, a3, a4}. a1 can be indicated by the value of the state 00 (or 11) of the corresponding 2-bit field, a2 can be indicated by the value of the state 01 (or 10) of the corresponding 2-bit field, a3 can be indicated by the value of the state 10 (or 01) of the corresponding 2-bit field, and a4 can be indicated by the value of the state 11 (or 00) of the corresponding 2-bit field.

[0139] According to an embodiment, a method of predefining the PUCCH repetition factor corresponding to each state value of the 2-bit field as one of {1, 2, 4, 8} may be considered. For example, state 00 (or 11) may be used to indicate repetition factor 1, state 01 (or 10) may be used to indicate repetition factor 2, state 10 (or 01) may be used to indicate repetition factor 4, and state 11 (or 00) may be used to indicate repetition factor 8. Based on the above definition, the UE may expect that the base station will only indicate the state corresponding to each of the preconfigured / pre-indicated multiple repetition factors via high-layer signaling (e.g., SIB, etc.). The UE may expect that the base station will not indicate to the UE the state that does not correspond to the multiple repetition factors. That is, the UE may regard the corresponding state as a reserved state.

[0140] Based on the above embodiments, the UE may consider (expect) the base station to use the MSB (or LSB) 2-bit field of a specific DCI field for PUCCH repetition transmission. The UE may consider (expect) the remaining DCI field (i.e., the remaining bits excluding the 2-bit field) to be used in an existing manner or for existing operations. For example, when the MCS field is used, the UE may expect that the MSB (or LSB) 2 bits of the total 5-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 3-bit field will be used to indicate the lowest (or highest or selected ones) index among the 8 indexes of the existing MCS table.

[0141] As another example, if the Downlink Assignment Index (DAI) field is used, the UE may expect that all MSB (or LSB) 2 bits of the total 2-bit field will be used for PUCCH repetition transmission.

[0142] However, even when the base station indicates only 2 repetition factors among {1, 2, 4, 8} via higher layer signaling, the proposed method always uses all 2-bit fields although it can be indicated with a 1-bit field. In this regard, the following embodiments may be considered.

[0143] According to an embodiment, a method may be considered to change the size of the field of the DCI indicating the repetition factor based on the number of repetition factors (ie, candidates of the repetition factor) configured by the base station to the UE. This is described in detail below.

[0144] A method may be considered in which the UE interprets the size of a specific DCI field indicating a PUCCH repetition factor differently depending on how many of {1, 2, 4, 8} the base station indicates via higher layer signaling (eg, SIB, etc.).

[0145] In this instance, the size of the DCI field based on the above-proposed method can be divided into the case where the base station configures two repetition factors (for example, two of {1, 2, 4, 8}) via high-level signaling (for example, SIB, etc.) and the case where the base station configures three or more repetition factors (for example, three or four of {1, 2, 4, 8}).

[0146] First, the base station can configure / indicate two values ​​in {1, 2, 4, 8} to the UE via high-level signaling (e.g., SIB, etc.) as candidate values ​​for the repetition factor of the PUCCH for Msg.4 HARQ-ACK. In this case, only 1 bit of a specific DCI field may be required to indicate the actual number of repeated transmissions to the UE. Therefore, when two values ​​in {1, 2, 4, 8} are configured, the base station can use the MSB (or LSB) 1-bit field of the specific DCI field to indicate the number of PUCCH repeated transmissions (repetition factor) to the UE. The value configured / indicated by the base station via high-level signaling (e.g., SIB, etc.) can be {a1, a2} in the order of configuration / indication (or ascending or descending order).

[0147] The UE may expect that the base station will use the MSB (or LSB) 1-bit field of a particular DCI field for PUCCH repetition transmission. The UE may expect that the remaining DCI fields will be used in the existing manner or for existing operation.

[0148] For example, if the MCS field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 5-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 4-bit field will be used to indicate the lowest (or highest or selected) index among the 16 indexes of the existing MCS table.

[0149] For another example, if the Downlink Assignment Index (DAI) field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 2-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 1-bit field will be used as a reserved field as before.

[0150] For another example, if the HARQ process number field is used, the UE may expect that the MSB (or LSB) 1 bit of the total 4-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 3-bit field will be used to indicate the lowest (or highest or selected) index among the 8 indexes of the existing HARQ process number index.

[0151] Secondly, the base station can configure / indicate three or more values ​​in {1,2,4,8} to the UE via high-level signaling (e.g., SIB, etc.) as candidate values ​​for the repetition factor of the PUCCH for Msg.4 HARQ-ACK. In this case, a 2-bit specific DCI field may be required to indicate the actual number of repeated transmissions to the UE. Therefore, when three or four values ​​in {1,2,4,8} are configured, the base station can use the MSB (or LSB) 2-bit field of the specific DCI field to indicate the number of PUCCH repeated transmissions to the UE. The value configured / indicated by the base station via high-level signaling (e.g., SIB, etc.) can be {a1, a2, a3} in the order of configuration / indication (or ascending or descending order). a1 can be indicated using the state 00 value (or 11) of the corresponding 2-bit field. a2 can be indicated using the state 01 value (or 10) of the corresponding 2-bit field. a3 can be indicated using the state 10 value (or 01) of the corresponding 2-bit field. The state 11 value (or 00) of the corresponding 2-bit field can be set to a reserved state.

[0152] In addition, the value configured / indicated by the base station via high-level signaling (e.g., SIB, etc.) may be {a1, a2, a3, a4} in the order of configuration / indication (or ascending or descending order). a1 may be indicated using a state 00 value (or 11) of the corresponding 2-bit field. a2 may be indicated using a state 01 value (or 10) of the corresponding 2-bit field. a3 may be indicated using a state 10 value (or 01) of the corresponding 2-bit field. a4 may be indicated using a state 11 value (or 00) of the corresponding 2-bit field.

[0153] The UE may expect the base station to use the MSB (or LSB) 2-bit field of a particular DCI field for PUCCH repetition transmission (in the same manner as defined in the embodiment, where the size of the DCI field used to indicate the repetition factor is always fixed to 2 bits). The UE may expect the remaining DCI fields to be used in the existing manner or for existing operations.

[0154] For example, if the MCS field is used, the UE may expect that the MSB (or LSB) 2 bits of the total 5-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 3-bit field will be used to indicate the lowest (or highest or selected) index among the 8 indexes of the existing MCS table.

[0155] As another example, if the Downlink Assignment Index (DAI) field is used, the UE may expect that all MSB (or LSB) 2 bits of the total 2-bit field will be used for PUCCH repetition transmission.

[0156] For another example, if the HARQ process number field is used, the UE may expect that the MSB (or LSB) 2 bits of the total 4-bit field will be used for PUCCH repetition transmission. The UE may expect that the remaining 2-bit field will be used to indicate the lowest (or highest or selected) index among the 4 indexes among the existing HARQ process number indexes.

[0157] [Proposed method 2]

[0158] A specific repetition number value may be added to the initial PUCCH resource set table. Alternatively, multiple specific repetition number sets may be predefined / preconfigured. Afterwards, the base station may configure / indicate the actual repetition number to the UE via high-level signaling (e.g., SIB, etc.) or other indication methods (e.g., DCI, etc.). This is described in detail below.

[0159] The base station may pre-configure K repetition number sets for each PUCCH resource set index (or each rPUCCH) in the initial PUCCH resource set table. The base station may configure one of the K repetition number sets via high-level signaling (e.g., SIB, etc.). Alternatively, the base station may configure one of the K repetition number sets based on Msg.2 / 4PDSCH and / or DCI scheduling Msg.2 / 4PDSCH, etc.

[0160] Alternatively, another method of fixing a specific number of repetitions for each PUCCH resource set index (or per 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 configuration according to this embodiment may be performed by reusing an existing table. For example, the configuration according to this embodiment may be performed based on a newly introduced table for repetition. In the new table, different numbers of repetitions may be mapped to the same PUCCH format.

[0161] 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. For example, the K number of repetitions may be {2, 4, 8}.

[0162] [Proposed method 3]

[0163] One or more repetition times may be preconfigured / pre-indicated on the NTN platform type (or satellite type, or satellite altitude, or UE type). This is described in detail below.

[0164] Due to the characteristics of the NTN system, there may be differences in the performance of the UL signal / channel depending on the NTN satellite type (or satellite altitude, etc.). Taking this into account, the number of repetitions (or set of repetition numbers) to be used / applied to the initial PUCCH resource set may be preconfigured / predetermined / predefined based on the NTN satellite type / altitude and / or UE type, etc.

[0165] For example, if the number of repetitions is determined based on the NTN satellite type, different numbers of repetitions (or sets of repetitions) to be used may be preconfigured / predetermined / predefined based on geostationary orbit (GEO), medium earth orbit (MEO), low earth orbit (LEO), etc. Thereafter, the UE may receive satellite orbit information to find out the NTN type. Through this, the number of repetitions of the initial PUCCH resource set may be determined.

[0166] Alternatively, the UE may receive satellite orbit information to find out the NTN type. Through this, the repetition number set of the initial PUCCH resource set may be determined. Thereafter, the base station may configure / indicate the actual repetition number to the UE through other indication methods (e.g., DCI, etc.).

[0167] [Proposed method 4]

[0168] The repetition request resource and repetition number of PUCCH for Msg.4 HARQ-ACK may be configured together with the repetition request resource and repetition number of PUSCH for Msg.3. This is described in detail below.

[0169] If, from the UE's perspective, repeated transmission of the PUCCH for Msg.4 HARQ-ACK is required, repeated transmission of the Msg.3 PUSCH may also be required. Therefore, a method similar to the triggering method for Msg.3 PUSCH repetition introduced in Rel-17 NR CE is also introduced to trigger repeated transmission of the PUCCH for Msg.4 HARQ-ACK.

[0170] A UE that intends to request Msg.3 PUSCH repetition may operate as follows: The UE may select and send a preamble index of one of the resources allocated by the base station among the existing RACH preamble resources to enable the base station to pre-request Msg.3 PUSCH repetition. By this, the UE may inform the base station that Msg.3 PUSCH repetition is required.

[0171] A similar method can be applied to repeated transmission of PUCCH for Msg.4 HARQ-ACK. The UE can select and send one of the resources allocated by the base station among the existing RACH preamble resources so that the base station can pre-request Msg.3 PUSCH repetition. Through this, the UE can notify the base station of the need for repeated transmission of PUCCH for Msg.4 HARQ-ACK.

[0172] Alternatively, the base station may allocate / configure new resources to the UE in the existing RACH preamble resources so that the UE can request repeated transmission of the PUCCH for Msg.4 HARQ-ACK. The UE may send a RACH preamble based on one of the configured resources. Through this, the UE may notify the base station of the need for repeated transmission of the PUCCH for Msg.4 HARQ-ACK.

[0173] For example, because there are many situations where the UE requires repeated transmission of Msg.3 PUSCH and repeated transmission of PUCCH for Msg.4 HARQ-ACK at the same time, the following implementation can be considered. The RACH preamble resource for requesting repeated transmission of PUCCH for Msg.4 HARQ-ACK (which can be newly defined) can be configured to be the same as or included in the RACH preamble resource allocated for requesting Msg.3 PUSCH repetition.

[0174] For example, the following implementations may be considered to increase the freedom of RACH preamble resource allocation of the base station: The RACH preamble resources used to request repeated transmission of PUCCH for Msg.4 HARQ-ACK (which may be newly defined) may be independently configured, regardless of the RACH preamble resources allocated for requesting Msg.3 PUSCH repetition.

[0175] If the UE selects a specific preamble index indicating that repeated transmission of PUCCH for Msg.4 HARQ-ACK is required (ie, if the UE selects one of the preconfigured RACH preamble resources), the following operations may be performed.

[0176] When a UE receives a specific DCI (e.g., DCI for scheduling Msg.4 PDSCH or DCI for scheduling Msg.2 RAR) and interprets the corresponding field, the UE may expect that a specific field (e.g., PUCCH repetition indicator field) will be included and transmitted. Examples of specific DCI fields may include an MCS field, a TDRA field, etc.

[0177] In addition, the base station may configure / indicate via higher layer signaling (eg, SIB, etc.) by pairing the PUCCH repetition number value for Msg.4 HARQ-ACK with the existing Msg.3 PUSCH repetition number value.

[0178] That is, for example, the base station may configure / indicate to the UE via high-layer signaling (e.g., SIB, etc.) K (e.g., K=4) combinations including a Msg.3 PUSCH repetition number value X and a repetition number value Y for the PUCCH for Msg.4 HARQ-ACK. For example, if K=4, the repetition number (X, Y) configured to the UE may be {(x1, y1), (x2, y2), (x3, y3), (x4, y4)}. Thereafter, the base station may indicate a specific value X to the UE via the higher 2 bits of a specific field (e.g., MCS field) of the DCI (e.g., DCI format 0_0) used to schedule the Msg.2 RAR. The value X may be applied to repeated transmissions of the Msg.3 PUSCH, and the value Y paired with the value X may be applied to repeated transmissions of the PUCCH for Msg.4 HARQ-ACK.

[0179] For example, it may be assumed that the value X and the value Y are set / indicated as integers greater than 1, and the UE selects and transmits one of the predefined preamble resources to request Msg.3 PUSCH repetition transmission. That is, this is a case where the UE requests both Msg.3 PUSCH repetition transmission and repetition transmission of PUCCH for Msg.4 HARQ-ACK together. When requesting both Msg.3 PUSCH repetition transmission and repetition transmission of PUCCH for Msg.4 HARQ-ACK together, the above-mentioned embodiment may be preferably used.

[0180] In addition, it can be assumed that the repetition value of the PUCCH for Msg.4 HARQ-ACK can be configured / indicated by the base station via high-level signaling (e.g., SIB, etc.) to be set to 3, 2, etc., instead of 4. Even in this case, an operation of pairing (or mapping) with four Msg.3 PUSCH repetition number values ​​may be required. This can be summarized as follows. In the method proposed below, it is assumed that the value of the repetition number is set so that the minimum value is indicated first and the maximum value is indicated later (e.g., a1 <a2<a3<a4,b1<b2<b3<b4)。

[0181] The number of repetitions of the PUCCH for Msg.4 HARQ-ACK may be set to three or less via higher layer signaling (eg, SIB, etc.) For example, the base station may configure / indicate three or less repetitions to the UE.

[0182] The configured / indicated value of the PUCCH repetition number for Msg.4 HARQ-ACK and the four Msg.3 PUSCH repetition numbers may be paired based on the following commands / rules.

[0183] A. Option 1) It is configured to pair one by one from the minimum (or maximum) value and reuse the maximum (or minimum) value for the remaining space.

[0184] i. For example, a method of pairing one by one from the minimum value and reusing the maximum value for the remaining space can be considered. Msg.3 PUSCH repetition number can be A = {a1, a2, a3, a4}, and Msg.4 HARQ-ACK PUCCH repetition number can be B = {b1, b2, b3}. Msg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, b1), (a2, b2), (a3, b3), (a4, b3)}.

[0185] ii. For another example, a method of pairing one by one from the maximum value (in reverse order) and reusing the minimum value for the remaining space may be considered. Msg.3 PUSCH repetition number may be A = {a1, a2, a3, a4}, and Msg.4 HARQ-ACK PUCCH repetition number may be B = {b1, b2}. Msg.3 PUSCH repetition number indicator field value may be set to {00, 01, 10, 11} = {(a1, b1), (a2, b1), (a3, b1), (a4, b2)}.

[0186] B. Option 1a) (Same result as Option 1, but expressed in a different way) It is configured to pair one by one from the minimum (or maximum) value, and if an unpaired state is indicated, the UE is configured to understand that it has been indicated with the maximum (or minimum) value.

[0187] i. For example, a method in which pairing is performed one by one from the minimum value and the UE considers that the maximum value has been indicated to the remaining space without pairing the remaining space can be considered. Msg.3 PUSCH repetition number can be A = {a1, a2, a3, a4}, and Msg.4 HARQ-ACK PUCCH repetition number can be B = {b1, b2, b3}. The Msg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, b1), (a2, b2), (a3, b3), (a4, -)}.

[0188] If the Msg.3 PUSCH repetition number indicator field is indicated with "11", the UE can determine that the Msg.4 HARQ-ACK PUCCH repetition number has been indicated with b3.

[0189] ii. For another example, a method can be considered in which pairing is performed one by one from the maximum value (in reverse order) and the UE understands that the minimum value has been indicated to the remaining space without pairing the remaining space. Msg.3 PUSCH repetition number can be A = {a1, a2, a3, a4}, and Msg.4 HARQ-ACK PUCCH repetition number can be B = {b1, b2}. The Msg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11} = {(a1, -), (a2, -), (a3, b1), (a4, b2)}.

[0190] If the Msg.3 PUSCH repetition number indicator field is indicated with "00" or "01", the UE can determine that the Msg.4 HARQ-ACK PUCCH repetition number has been indicated with b1.

[0191] C. Option 2) It is configured to pair the minimum value and the maximum value to the minimum value and / or the maximum value among the Msg.3 PUSCH repetition number, and reuse the middle value for the remaining space.

[0192] i. For example, the Msg.3 PUSCH repetition number can be A={a1, a2, a3, a4}, and the Msg.4 HARQ-ACK PUCCH repetition number can be B={b1, b2, b3}. The Msg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11}={(a1, b1), (a2, b2), (a3, b2), (a4, b3)}.

[0193] D. Option 3) (If two PUCCH repetitions are sent) It is configured to pair the Msg.3 PUSCH repetition and the Msg.4 HARQ-ACK PUCCH repetition at a ratio of 2:1 starting from the minimum value (or maximum value).

[0194] i. For example, the Msg.3 PUSCH repetition number can be A={a1, a2, a3, a4}, and the Msg.4 HARQ-ACK PUCCH repetition number can be B={b1, b2}. The Msg.3 PUSCH repetition number indicator field value can be set to {00, 01, 10, 11}={(a1, b1), (a2, b1), (a3, b2), (a4, b2)}.

[0195] E. Option 4) A method in which the base station directly configures / indicates via higher layer signaling (eg, SIB, etc.) whether a specific Msg.3 PUSCH repetition number value and a specific Msg.4 HARQ-ACK PUCCH repetition number value are paired.

[0196] i. For example, the Msg.3 PUSCH repetition number may be A={a1, a2, a3, a4}, and the Msg.4 HARQ-ACK PUCCH repetition number may be B={b1, b2}. The Msg.3 PUSCH repetition number indicator field value may be indicated as in 1 and 2 below.

[0197] 1.{00,01,10,11}={(a1,b1),(a2,b1),(a3,b2),(a4,b2)}

[0198] 2.{00,01,10,11}={(a1,b1),(a2,b1),(a3,b1),(a4,b2)}

[0199] F. Option 5) A method in which multiple candidates for how to pair the Msg.3 PUSCH repetition number with the Msg.4 HARQ-ACK PUCCH repetition number are predefined and the base station indicates one of the multiple candidates via higher layer signaling (eg, SIB, etc.).

[0200] G. The number of Msg.3 PUSCH repetitions and / or the number of Msg.4 HARQ-ACK PUCCH repetitions used in the above-proposed method may be a positive integer including 1.

[0201] i. That is, the number of Msg.3 PUSCH repetitions can be {1, 2, 3, 4, 7, 8, 12, 16}, etc., and the number of Msg.4 HARQ-ACK PUCCH repetitions can be {1, 2, 4, 8}, etc.

[0202] ii. Therefore, a single transmission of Msg.3 PUSCH can be paired with repeated transmission of Msg.4 HARQ-ACK PUCCH, and conversely, repeated transmission of Msg.3 PUSCH can be paired with a single transmission of Msg.4 HARQ-ACK PUCCH. A single transmission of Msg.3 PUSCH can be paired with a single transmission of Msg.4 HARQ-ACK PUCCH.

[0203] In another method, a set of Msg.4HARQ-ACKPUCCH repetition times can be determined based on the indicated Msg.3PUSCH repetition times value. Specifically, the base station can configure / indicate {A,B,C,D} to the UE as the Msg.3PUSCH repetition times value. And, the base station can configure / indicate {a,b,c,d} to the UE as the Msg.4HARQ-ACK PUCCH repetition times value. In this case, if the base station indicates "A" to the UE as the Msg.3PUSCH repetition times value, the set of Msg.4HARQ-ACK PUCCH repetition times for the UE can be determined as {a,b}. On the other hand, if the base station indicates "B" to the UE as the Msg.3PUSCH repetition times value, the set of Msg.4HARQ-ACK PUCCH repetition times for the UE can be determined as {c,d}. In this case, the UE may monitor DCI format 0_1 ​​in anticipation that the base station will dynamically indicate the number of Msg.4 HARQ-ACK PUCCH repetitions to the UE using a 1-bit field.

[0204] The above-mentioned method is a method for implicitly mapping the number of Msg.3 PUSCH repetitions and the number of Msg.4 HARQ-ACK PUCCH repetitions. In addition, it can be considered that the above-mentioned method is similarly applied to the number of PRACH repetitions and the number of Msg.4 HARQ-ACK PUCCH repetitions.

[0205] In the specifically proposed method, the Msg.4HARQ-ACK PUCCH repetition number or a set of Msg.4HARQ-ACK PUCCH repetition numbers can be determined based on the PRACH repetition number value selected by the UE. Specifically, the base station can configure / indicate one or more PRACH repetition numbers via high-layer signaling. In this instance, if the UE has a PRACH repetition feature and intends to perform repeated transmission, an appropriate PRACH repetition number can be selected based on the RSRP level of the UE. In addition, if the UE has an Msg.4HARQ-ACK PUCCH repetition feature and intends to perform repeated transmission, the Msg.4HARQ-ACK PUCCH repetition number or a set of Msg.4HARQ-ACK PUCCH repetition numbers can be determined by the PRACH repetition number value pre-selected by the UE.

[0206] For example, it can be assumed that the PRACH repetition times configured by the base station are A and B (e.g., A < B), and the Msg.4 HARQ-ACK PUCCH repetition times configured by the base station are a and b (e.g., a < b). If the UE selects the PRACH repetition time "A", the Msg.4 HARQ-ACK PUCCH repetition time can be configured as "a". If the UE selects the PRACH repetition time "B", the Msg.4 HARQ-ACK PUCCH repetition time can be configured as "b". In such a case, the UE can monitor DCI format 0_1, expecting that the base station will not dynamically indicate the Msg.4 HARQ-ACK PUCCH repetition time.

[0207] For another example, it can be assumed that the PRACH repetition times configured by the base station are A and B (e.g., A < B), and the Msg.4 HARQ-ACK PUCCH repetition times configured by the base station are a, b, c, and d (e.g., a < b < c < d). If the UE selects the PRACH repetition time "A", the set of Msg.4 HARQ-ACK PUCCH repetition times can be configured as {a, b}. If the UE selects the PRACH repetition time "B", the set of Msg.4 HARQ-ACK PUCCH repetition times can be configured as {c, d}. In such a case, the UE can monitor DCI format 0_1, expecting that the base station will use a 1-bit field to dynamically indicate the Msg.4 HARQ-ACK PUCCH repetition time to the UE.

[0208] For another example, it can be assumed that the PRACH repetition times configured by the base station are A and B (e.g., A < B), and the Msg.4 HARQ-ACK PUCCH repetition times configured by the base station are a, b, c, and d (e.g., a < b < c < d). If the UE selects the PRACH repetition time "A", the Msg.4 HARQ-ACK PUCCH repetition time can be configured as "a". If the UE selects the PRACH repetition time "B", the set of Msg.4 HARQ-ACK PUCCH repetition times can be configured as {b, c, d}. In such a case, when the UE has selected the PRACH repetition time "A", the UE can monitor DCI format 0_1, expecting that the base station will not dynamically indicate the Msg.4 HARQ-ACK PUCCH repetition time. On the other hand, when the UE has selected the PRACH repetition time "B", the UE can monitor DCI format 0_1, expecting that the base station will use a 2-bit field to dynamically indicate the Msg.4 HARQ-ACK PUCCH repetition time to the UE.

[0209] In addition, a method of implicitly pairing the Msg.3 PUSCH repetition number and the Msg.4 HARQ-ACK PUCCH repetition number may be considered. For example, the Msg.3 PUSCH repetition number set may be implicitly determined by the PRACH repetition number value selected by the UE, and the Msg.4 HARQ-ACK PUCCH repetition number may be implicitly determined by the Msg.3 PUSCH repetition number value indicated by the base station.

[0210] The above operation can be applied when a specific UE has a Msg.4 HARQ-ACK PUCCH repetition feature and intends to perform repeated transmission, and at the same time, has a Msg.3 PUSCH repetition feature and / or a PRACH repetition feature and intends to perform repeated transmission. If a specific UE only has the Msg.4 HARQ-ACK PUCCH repetition feature and only the corresponding feature is used to perform repeated transmission, the UE can operate independently regardless of the number of PRACH repetitions and / or the number of Msg.3 PUSCH repetitions configured by the base station. That is, if the base station configures / indicates multiple Msg.4 HARQ-ACK PUCCH repetitions, the UE can be configured to monitor DCI format 0_1 ​​in the expectation that the base station will use an N-bit field (where N=1 or 2) to dynamically indicate the number of Msg.4 HARQ-ACK PUCCH repetitions to the UE. If the base station configures / indicates one Msg.4 HARQ-ACK PUCCH repetition, the UE may be configured to monitor DCI format 0_1 ​​in the expectation that the base station will not dynamically indicate the number of Msg.4 HARQ-ACK PUCCH repetitions.

[0211] [Proposed method 5]

[0212] A method of providing a repetition number that can be provided to an initial PUCCH resource set via high-layer signaling (e.g., SIB, etc.) and a method of providing multiple repetition number sets and then configuring / indicating the repetition number through other indication methods (e.g., DCI, etc.) can be supported at the same time. An embodiment that can be applied in this case is described in detail below.

[0213] It is possible to simultaneously support i) a method of configuring / indicating a cell-specific PUCCH repetition number via high-layer signaling (e.g., SIB, etc.), and ii) a method of providing multiple repetition number sets and then dynamically configuring / indicating the PUCCH repetition number through other indication methods (e.g., DCI, etc.). In this case, the UE can operate based on one of the following options.

[0214] (Option 1) The base station can configure a cell-specific PUCCH repetition number to the UE via high-layer signaling (e.g., SIB, etc.). The UE can understand and operate: only one PUCCH repetition number is always supported in a cell-specific manner in the corresponding cell. Typically, in this case, other parameters related to the PUCCH repetition factor can be configured to be ignored. Therefore, the UE can expect that the PUCCH repetition (repetition number / factor) will not be dynamically indicated. The UE can interpret the specific (DCI) field defined as being able to dynamically indicate PUCCH repetition in the same way as the existing operation that does not support repetition.

[0215] Alternatively, the base station may configure / provide multiple sets of repetition numbers to the UE. The UE may understand and operate that the repetition number will always be dynamically indicated in the corresponding cell. Typically, even in this case, the UE may be configured to ignore other parameters related to the PUCCH repetition factor. Therefore, the UE may expect that the PUCCH repetition (i.e., the number of repetitions) will be dynamically indicated. The UE may understand a specific (DCI) field defined as being able to dynamically indicate PUCCH repetition as supporting repetition and determining the number of repetitions (repetition factor).

[0216] Alternatively, the UE may expect that the operation of the base station configuring a cell-specific PUCCH repetition number via high-layer signaling (e.g., SIB, etc.) and the operation for the base station to provide multiple repetition number sets do not occur at the same time. That is, when the base station indicates the cell-specific PUCCH repetition number through a high-layer parameter, the base station may not indicate the parameter for providing multiple repetition number sets. Or, conversely, when the base station indicates multiple repetition number sets through a high-layer parameter, the base station may not indicate the parameter indicating the cell-specific PUCCH repetition number.

[0217] (Option 2) The base station can configure a cell-specific PUCCH repetition number to the UE via high-level signaling (e.g., SIB, etc.). The UE can interpret / determine this value as some value that can be dynamically indicated. That is, the value indicated in a cell-specific manner can be overwritten by the dynamically indicated value.

[0218] For example, a cell-specific number of PUCCH repetitions can be set to the maximum value among the values ​​that can be dynamically indicated. That is, if the value of N is indicated in a cell-specific manner, the repetition factor that can be dynamically indicated can be M values ​​less than or equal to N (for example, if M is 4, it can be N, N-1, N-2, N-3 or N, N / 2, N / 4, N / 8, etc.). Thereafter, the base station can configure / indicate the actual number of repetitions to the UE through other indication methods (for example, DCI, etc.). In this case, the UE may expect that the repetition factor will be indicated through a specific (DCI) field, which is defined as being able to dynamically indicate PUCCH repetition. Thereafter, if a specific repetition factor is indicated from the base station, the UE can perform PUCCH repetition based on this.

[0219] For another example, a cell-specific number of PUCCH repetitions may be set to the minimum value excluding 1 among the values ​​that can be dynamically indicated. That is, if the value of N is indicated in a cell-specific manner, the repetition factor that can be dynamically indicated may be a total of M values, including 1 and (M-1) values ​​greater than or equal to N (for example, if M is 4, it may be 1, N, N+1, N+2 or 1, N, 2*N, 4*N, etc.), and a total of M values ​​may be configured / indicated to the UE. Thereafter, the base station may configure / indicate the actual number of repetitions to the UE through other indication methods (for example, DCI, etc.). In this instance, the UE may expect that the repetition factor will be indicated through a specific (DCI) field, which is defined as being able to dynamically indicate PUCCH repetition. Thereafter, if a specific repetition factor is indicated from the base station, the UE may perform PUCCH repetition based on this.

[0220] (Option 3) The base station can configure / indicate a cell-specific PUCCH repetition number to the UE via high-level signaling (e.g., SIB, etc.). In addition, the following scenario can be considered: a set of PUCCH repetition numbers that the base station later dynamically configures / indicates via high-level signaling (e.g., SIB, etc.) is configured / indicated to the UE. Typically, the cell-specific PUCCH repetition value configured / indicated by the base station and the PUCCH repetition value that is later dynamically configured / indicated by the base station can be set independently of each other. Thereafter, the operation of the UE can be indicated by the base station through a specific (DCI) 1-bit field. Specifically, the base station can inform the UE through a specific (DCI) 1-bit field whether to use a cell-specific PUCCH repetition number, or to dynamically configure / indicate one of a plurality of pre-configured PUCCH repetition number values ​​and use that value.

[0221] For example, the MSB 1 bit in the MCS field of DCI format 0_1 ​​can be used to schedule Msg4 PDSCH. Based on the MSB 1 bit, the base station can indicate to the UE whether the UE uses a cell-specific PUCCH repetition number, or dynamically configures / indicates one of multiple pre-configured PUCCH repetition number values ​​and uses that value. If the base station instructs the UE to use a cell-specific PUCCH repetition number, the base station can configure / indicate the MCS value to the UE through the remaining 4-bit MCS field. If the base station indicates that the UE is dynamically configured / indicated one of multiple pre-configured PUCCH repetition number values ​​and uses that value, the base station can use the next MSB L bits (excluding the previously used MSB 1 bit) to configure / indicate the actual repetition number to the UE (for example, if the base station preconfigures a total of K repetition numbers, L bits are used). ). The base station can configure / indicate the MCS value to the UE through the remaining 5-1-L bits of the MCS field.

[0222] (Option 4) The following scenario can be considered: the base station indicates a cell-specific PUCCH repetition number to the UE via high-layer signaling (e.g., SIB, etc.). In addition, the base station can configure whether to indicate a set of PUCCH repetition numbers that the base station later dynamically configures / indicates via high-layer signaling (e.g., SIB, etc.). If the base station does not indicate to the UE a set of PUCCH repetition numbers that is later dynamically configured / indicated by the base station, the UE can perform the operation of Option 1 or Option 2. On the other hand, if the base station indicates to the UE a set of PUCCH repetition numbers that is later dynamically configured / indicated by the base station, the UE can perform the operation of Option 1 or Option 3.

[0223] Method for correcting / adding initial PUCCH resource set table

[0224] Consider using PUCCH format 1 occupying 14 OFDM symbols in the existing initial PUCCH resource set table for coverage enhanced repeated transmission. That is, since a total of 5 indexes from index 11 to index 15 in Table 2 are resources considered for repeated transmission, the following method can be additionally considered.

[0225] [Proposed Method A]

[0226] If PUCCH repetition transmission for Msg.4 HARQ-ACK is considered, the UE expects the parameter (e.g., pucch-ResourceCommon) of the index of the initial PUCCH resource set determined via SIB to be indicated by one of 11, 12, 13, 14 and (15).

[0227] An implementation scheme may be considered in at least one of the following cases: i) a case where the UE requests repeated transmission of PUCCH for Msg.4 HARQ-ACK, ii) a case where the UE reports to the base station the UE capability for repeated transmission of PUCCH for Msg.4 HARQ-ACK, and / or iii) a case where the base station configures / indicates the number of repeated transmissions of PUCCH for Msg.4 HARQ-ACK via higher-layer signaling (e.g., SIB, etc.).

[0228] The UE may expect that the base station will configure / indicate one of the indices consisting of PUCCH format 1 occupying 14 OFDM symbols. That is, the UE may expect that one of 11, 12, 13, 14, and 15 will be configured / indicated as the parameter (e.g., pucch-ResourceCommon) value for determining the index of the initial PUCCH resource set via the SIB. Alternatively, the UE may expect that a value less than or equal to 10 will not be set / indicated as the value of the parameter. Alternatively, the UE may expect that one of 11, 12, 13, and 14 will be set / indicated as the value of the parameter. Alternatively, the UE may expect that a value less than or equal to 10 among numbers other than 15 will not be set / indicated as the value of the parameter.

[0229] [Proposed Method B]

[0230] Method for introducing a new table for PUCCH repetitive transmission for Msg.4 HARQ-ACK

[0231] Since there are 5 indexes (11, 12, 13, 14, and 15) consisting of PUCCH format 1 occupying 14 OFDM symbols in the existing table (i.e., Table 2), it is possible to consider adding a new table for PUCCH repeated transmission for Msg.4 HARQ-ACK by adding M indexes. As described above, if a new table for repeated transmission is added, the following operations may be performed. The base station may configure / indicate to the UE via high-level signaling (e.g., SIB, etc.) whether to use an existing table (i.e., Table 2) that does not consider repeated transmission or a new table that considers repeated transmission. The UE may decide whether to use an existing table or a new table, and determine which table to refer to.

[0232] Alternatively, the UE can determine whether to refer to an existing table or a new table by referring to other parameter values. The table to be referred to by the UE may be predefined. For example, if a new table for repeated transmission is newly defined separately from the existing table, and if a set of repetition times for PUCCH for Msg.4 HARQ-ACK is provided via high-layer signaling (e.g., SIB, etc.) (or a repetition time for PUCCH for Msg.4 HARQ-ACK paired with a repetition time for Msg.3 PUSCH is provided, or if the UE requests repeated transmission of PUCCH for Msg.4 HARQ-ACK), the UE may expect that the base station will use the new table to configure / indicate the initial PUCCH resource set index.

[0233] For another example, even when a new table for repeated transmission has been newly defined separately from the existing table, if a repetition number set for PUCCH for Msg.4 HARQ-ACK is not provided via high-layer signaling (e.g., SIB, etc.) (or if the repetition number of PUCCH for Msg.4 HARQ-ACK paired with the repetition number of 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 that the base station will use the existing table to configure / indicate the initial PUCCH resource set index. The UE may determine that repeated transmission of PUCCH for Msg.4 HARQ-ACK will not be configured / indicated.

[0234] Basically, the following operations / configurations can be considered for the possibly newly introduced initial PUCCH resource set index, since it is preferred that PUCCH format 1 occupying 14 OFDM symbols is kept intact. The first symbol can always be fixed to 0. In addition, a new index can be defined by adding a PRB offset value, a set of initial CS indices, or a repetition count value. For a specific example, the new index can be represented as the following options.

[0235] [Option 1]

[0236] Method of constructing a new table with a total of eight indexes by adding three new indexes to indexes 11, 12, 13, 14, and 15 (i.e., 3-bit indication) of an existing table

[0237] It is possible to consider adding three new indexes as shown in Table 3 or Table 4 below. A total of eight indexes are configured, and the base station can configure / indicate one of the eight indexes to the UE through a 3-bit field of the SIB (a 1-bit field reduction compared to existing operations). That is, the PUCCH format, the first symbol, and the number of symbols can be fixed to 1, 0, and 14, respectively, and a new index can be defined by a combination of a set of PRB offsets and initial CS indexes. It is possible to consider a combination of PUCCH format 1 and CS {0, 4, 8} that is not in the existing table, or it is possible to consider adding new values ​​such as PRB offset 4 or 8 for CS {0, 6}.

[0238] The above method may be applied in the same manner as the method of configuring / indicating the number of repetitions or the number of repetitions set via higher layer signaling proposed in the embodiment related to the number of repetition transmissions of the above initial PUCCH resource set.

[0239] [Table 3]

[0240]

[0241]

[0242] Referring to Table 3, the newly proposed items based on this embodiment are indexes 1, 2, and 3.

[0243] [Table 4]

[0244]

[0245] Referring to Table 4, the newly proposed items based on this embodiment are indexes 1, 2, and 6.

[0246] [Option 2]

[0247] Method to construct a new table with a total of 16 indexes by adding 11 new indexes to indexes 11, 12, 13, 14, and 15 (i.e., 4-bit indication) of the existing table

[0248] 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 configure / indicate one of the 15 indexes to the UE through a 4-bit field of the SIB (using the same bit field as the existing operation). That is, the PUCCH format, the first symbol, and the number of symbols can be fixed to 1, 0, and 14, respectively, and a new index can be defined by a combination of a PRB offset, a set of initial CS indexes, and / or the number of repetitions, etc.

[0249] In this example, 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, a new index can be proposed by a combination of a set of PRB offsets and / or initial CS indexes, as shown in Table 5.

[0250] On the other hand, if a repetition number item is added to the new table, a new table including a total of 16 new indexes is created by combining the existing 5 indexes with the newly introduced repetition number value. That is, the new table is as shown in Table 6. This may be an example of a method of explicitly adding the repetition number to the initial PUCCH resource set table, which is one of the methods based on the implementation related to the number of repeated transmissions of the initial PUCCH resource set described above.

[0251] In this case, as described above, if the base station does not intend to provide initial PUCCH repetition, the base station may configure / indicate reference to the existing table through a separate indication method.

[0252] [Table 5]

[0253]

[0254]

[0255] Referring to Table 5, newly proposed items based on this embodiment are indexes 1, 2, 3, 4, 5, 6, 7, and 11 (indexes 13 to 15 are reserved).

[0256] [Table 6]

[0257]

[0258]

[0259] Referring to Table 6, newly proposed items based on this embodiment are indexes 0 to 15, and the number of repetitions is added.

[0260] Figures 4 to 8 FIG. 2 shows frequency hopping associated with repeated transmission according to an embodiment of the present disclosure. Figures 4 to 8 The frequency hopping (FH) operation in repeated transmission is described in detail.

[0261] Method for configuring frequency hopping in repeated transmission of initial PUCCH resource set

[0262] If an existing initial PUCCH resource set is used, the UE is configured to perform intra-slot frequency hopping (when it is not an interleaved structure). In this case, even if repeated transmission of the initial PUCCH resource set is considered, repeated transmission can be performed while keeping the existing intra-slot frequency hopping operation intact. For example, when 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 based on the configuration of the base station, the UE can perform repeated transmission while maintaining the position of each hop. Referring to FIG.4, the UE can perform M (e.g., M=4) repeated transmissions based on the existing FH operation.

[0263] In order to increase the effect of repeated transmission, it can be considered that the frequency hopping operation is configured as follows.

[0264] [Proposed Method I]

[0265] Method for applying inter-slot frequency hopping operation (without intra-slot frequency hopping operation) when repeated transmission of PUCCH for Msg.4 HARQ-ACK is configured

[0266] First, it can be assumed that the number of repeated transmissions of the PUCCH for Msg.4 HARQ-ACK is M (where M is an even number). For the first M / 2 times, the UE can send it without performing frequency hopping operations within all time slots / between time slots. For the remaining M / 2 times, the UE can send it by applying only inter-time slot hopping compared to the initial transmission without performing intra-time slot hopping. For example, based on the configuration of the base station, the first hop of the PUCCH format 1 corresponding to the initial PUCCH resource set can be located at the lowest frequency, and the second hop can be located at the highest frequency. Reference Figure 5 , the UE may perform repetitive transmission based on the lowest frequency (e.g., the lowest PRB) without performing frequency hopping in slot indexes N and N+1. The UE may perform repetitive transmission based on the highest frequency (e.g., the highest PRB) in slot indexes N+2 and N+3.

[0267] Second, if repetitive transmission of PUCCH for Msg.4 HARQ-ACK is applied, the UE may perform repetitive transmission as follows.

[0268] The UE may perform operations in even-numbered time slots (e.g., time slots with even-numbered indices, Figure 6 Instead of performing frequency hopping within / between all time slots, it is sent in time slot indices N and N+2).

[0269] The UE may transmit the signal in an odd-numbered time slot (e.g., a time slot with an odd-numbered index, for example) by applying only inter-slot frequency hopping compared to the initial transmission without performing intra-slot frequency hopping. Figure 6For example, based on the configuration of the base station, 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. Figure 6 , the UE may perform repeated transmission based on the lowest frequency (e.g., the lowest PRB) in slot indexes N and N+2. The UE may perform repeated transmission based on the highest frequency (e.g., the highest PRB) in slot indexes N+1 and N+3.

[0270] [Proposed Method II]

[0271] Method for applying inter-slot frequency hopping operation and intra-slot frequency hopping operation when repeated transmission of PUCCH for Msg.4 HARQ-ACK is configured

[0272] First, if the number of repeated transmissions is M (where M is an even number), the UE may perform repeated transmissions as follows. For the first M / 2 times, the UE may send it based on the intra-slot frequency hopping operation in the same order as the initially configured order. For the remaining M / 2 times, the UE may send it based on the intra-slot frequency hopping operation in the reverse order of the initially configured order.

[0273] That is, the initially configured order may be that the 1st hop is the lowest PRB and the 2nd hop is the highest PRB. In this case, the order of intra-slot frequency hopping applied by the UE may be as follows. Until the first M / 2 slots, the 1st hop may be the lowest PRB and the 2nd hop may be the highest PRB in the same order as initially configured. In the remaining M / 2 slots, the 1st hop may be the highest PRB and the 2nd hop may be the lowest PRB. Figure 7 In slot indexes N and N+1, the order of frequency hopping within a slot is lowest PRB→highest PRB. In contrast to slot indexes N and N+1, in slot indexes N+2 and N+3, the order of frequency hopping within a slot is highest PRB→lowest PRB.

[0274] Second, if repeated transmission is applied, the UE may perform repeated transmission as follows.

[0275] The UE may operate in even-numbered time slots (e.g., time slots with even-numbered indices, based on intra-slot hopping) in the same order as initially configured. Figure 8 It is sent in time slot index N and N+2).

[0276] The UE may operate in odd-numbered time slots (e.g., time slots with odd-numbered indices, based on intra-slot frequency hopping) in the reverse order of the initially configured order. Figure 8In other words, the order initially configured may be that the first hop is the lowest PRB and the second hop is the highest PRB. In this case, the order of intra-slot hopping applied by the UE may be as follows. In even-numbered slots, the first hop may be the lowest PRB and the second hop may be the highest PRB in the same order as initially configured. In odd-numbered slots, the first hop may be the highest PRB and the second hop may be the lowest PRB. For example, referring to Figure 8 In slot indexes N and N+2, the order of frequency hopping within a slot is lowest PRB→highest PRB. In slot indexes N+1 and N+3, the order of frequency hopping within a slot is highest PRB→lowest PRB.

[0277] In another method, if repeated transmission of PUCCH for Msg.4 HARQ-ACK is configured, it can be configured so that intra-slot and / or inter-slot frequency hopping operations are not supported. That is, if the base station indicates a specific parameter for requesting repeated transmission of PUCCH for Msg.4 HARQ-ACK (e.g., the number of repeated transmissions or whether repeated transmissions are used, etc.), the UE can send PUCCH without performing frequency hopping operations. In this case, the UE can perform repeated transmission of PUCCH at the frequency position initially configured by the base station without frequency hopping operations.

[0278] Alternatively, if repeated transmission of PUCCH for Msg.4 HARQ-ACK is configured, the intra-time slot and / or inter-time slot frequency hopping operation of the UE can be enabled / disabled based on the configuration of the base station. That is, the base station can indicate to the UE specific parameters for requesting repeated transmission of PUCCH for Msg.4 HARQ-ACK (e.g., the number of repeated transmissions or whether repeated transmissions are used, etc.). The base station can configure / indicate information about enabling / disabling frequency hopping operation and specific parameters to the UE. In this case, the UE can perform repeated transmission with or without adding intra-time slot and / or inter-time slot frequency hopping operation based on the configuration / instruction of the base station.

[0279] The proposed method may be configured / applied to other UL signals / channels, such as PRACH / PUSCH / PUCCH. In addition, since the examples of the above-proposed methods may also be included as one of the implementation methods of the present disclosure, it is obvious that they may be considered as a proposed method. The above-proposed methods may be implemented independently, but may also be implemented in the form of a combination (or merger) of some of the proposed methods. Information about whether the proposed method is applied (or information about the rules of the proposed method) may be defined as a rule so that the base station notifies the UE of the application of the proposed method via a predefined signal (e.g., a physical layer signal or a higher layer signal). For example, a higher layer may include one or more functional layers, such as MAC, RLC, PDCP, RRC, and SDAP.

[0280] From an implementation perspective, the operations of the base station / UE according to the above-mentioned embodiments (eg, operations related to the PUCCH for transmission of Msg4 HARQ-ACK information) may be referred to below. Fig.11 The device described (e.g. Fig.11 processors 110 and 210) for processing.

[0281] The operation of the base station / UE according to the above embodiment (for example, the operation related to the PUCCH for transmission of Msg4 HARQ-ACK information) may be used to execute at least one processor (for example, Fig.11 The processors 110 and 210) are stored in the form of commands / programs (e.g., instructions, executable code) in the memory (e.g., Fig.11 in memory 140 and 240).

[0282] Below, reference Fig. 9 and Fig.10 The above embodiments are described in detail from the perspective of the operation of the UE and the base station. The methods described below are distinguished only for the convenience of explanation. Therefore, as long as these methods are not mutually exclusive, it is obvious that part of the configuration of any method can be replaced by or combined with part of the configuration of another method.

[0283] Fig. 9 is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present disclosure.

[0284] Reference Fig. 9 According to an embodiment of the present disclosure, the method performed by a user equipment (UE) in a wireless communication system may include a SIB receiving step S910, a random access preamble sending step S920, a random access response receiving step S930, a PUSCH sending step S940, a DCI receiving step S950, a PDSCH receiving step S960 and a HARQ-ACK information sending step S970.

[0285] In step S910 , the UE receives a system information block (SIB) from a base station.

[0286] According to an embodiment, multiple repetition factors may be configured based on the SIB. That is, the SIB may include information about multiple repetition factors. For example, the multiple repetition factors may include two or more values ​​of 2, 4, and / or 8.

[0287] Depending on the implementation, the SIB may include a parameter pucch-ResourceCommon. The term "pucch-ResourceCommon" refers to an example of a name of a parameter related to the present implementation, and is not intended to limit the technical concept of the present implementation to the name. For example, the parameter "pucch-ResourceCommon" may be replaced by "high-level parameter", "first parameter", "parameter related to PUCCH resource set", etc. The present implementation may be based on the proposed method A.

[0288] The parameter "pucch-ResourceCommon" may be associated with a PUCCH resource set before a dedicated PUCCH resource configuration.

[0289] A PUCCH resource set associated with a PUCCH may be configured based on a row of a table (e.g., Table 2), in which 16 rows constitute 16 PUCCH configurations. In this case, the value of the parameter "pucch-ResourceCommon" may be set to only one of the indices representing the repeated configurations for the PUCCH. Specifically, among indices 0 to 15 representing 16 rows, the value of the parameter "pucch-ResourceCommon" may be based on one of the indices associated with a specific PUCCH format.

[0290] The specific PUCCH format may be PUCCH format 1. The value of the parameter "pucch-ResourceCommon" may be 11, 12, 13, 14 or 15.

[0291] 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 cyclic shift (CS) indices.

[0292] In step S920, the UE sends a random access preamble to the base station. The random access preamble may be based on Msg1 of the type 1 random access procedure (see Table 1).

[0293] In step S930, the UE receives a random access response (RAR) from the base station. The RAR may be based on Msg2 (see Table 1) of the type 1 random access procedure.

[0294] In step S940, the UE sends a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant related to the RAR to the base station. The PUSCH may be based on Msg3 of the type 1 random access procedure.

[0295] In step S950, the UE receives downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) from the base station. In this case, the PDSCH may be associated with Msg4 of the random access procedure. That is, the PDSCH may include a contention resolution identifier (ID). For example, the DCI may be based on DCI format 1_0 of Table 1.

[0296] The DCI may include a downlink assignment index (DAI) field.

[0297] In step S960 , the UE receives a PDSCH from the base station.

[0298] In step S970, the UE transmits Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) information related to the reception of the PDSCH to the base station. The HARQ-ACK information may be transmitted based on repetition of a Physical Uplink Control Channel (PUCCH).

[0299] According to an embodiment, a repetition factor related to PUCCH among multiple repetition factors may be indicated based on the DAI field. This embodiment may be based on the proposed method 1. This is described in detail below.

[0300] The repetition factor associated with the PUCCH may be indicated based on a code point based on at least one of: i) a first bit of the DAI field and / or ii) a second bit of the DAI field.

[0301] The DAI field may be a 2-bit field. The first bit may be the most significant bit (MSB) or the least significant bit (LSB) of the DAI field, and the second bit may be the LSB or the MSB of the DAI field.

[0302] The code point may be determined by 1) a number of bits based on the number of multiple repetition factors or 2) a predefined number of bits (regardless of the number of multiple repetition factors). Implementations based on 1) and 2) are described in turn below.

[0303] According to an embodiment, a code point may be determined based on the number of multiple repetition factors. In this case, the code point when the number of multiple repetition factors is 2 may be different from the code point when the number of multiple repetition factors is greater than 2. This is described in detail below.

[0304] Based on the number of multiple repetition factors being 2, the code point may be one of two code points based on the first bit or the second bit. For example, the code point may be one of code points (0, 1) based on the LSB (or MSB) of the DAI field.

[0305] Each of the two code points may be associated with each repetition factor determined based on the order of the multiple repetition factors. This is described in detail assuming that the order configured / indicated with two repetition factors 2 and 4 is {2,4}. The two code points 0 and 1 may be mapped to the two repetition factors 2 and 4 as follows.

[0306] For 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 in which the LSB is 0, the first repetition factor 2 (or the second repetition factor 4) of the two repetition factors 2 and 4 may be indicated. Based on the DAI field in which the LSB is 1, the second repetition factor 4 (or the first repetition factor 2) of the two repetition factors 2 and 4 may be indicated.

[0307] The code point may be one of four code points based on the first bit and the second bit based on the number of the multiple repetition factors being greater than 2. As a specific example, the code point may be one of the 2-bit code points (00, 01, 10, 11) based on the DAI field.

[0308] Each of the four code points may be associated with each repetition factor determined based on the order of the multiple repetition factors. This is described in detail assuming that the order configured / indicated with three repetition factors 2, 4, and 8 is {2, 4, 8}. The four code points 00, 01, 10, and 11 may be mapped to the three repetition factors 2, 4, and 8 as follows.

[0309] For 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) may not be used (i.e., code point 11 or 00 corresponds to the reserved state of method 1 proposed above).

[0310] In other words, if the value of the DAI field is 00 (or 11), it can indicate the first repetition factor 2 among the three repetition factors 2, 4, and 8. If the value of the DAI field is 01 (or 10), it can indicate the second repetition factor 4 among the three repetition factors 2, 4, and 8. If the value of the DAI field is 10 (or 01), it can indicate the third repetition factor 8 among the three repetition factors 2, 4, and 8.

[0311] Based on the ascending or descending order of the code points (1 / 2 bit code points) (e.g., 00→11 or 11→00), the corresponding code points can be mapped to each repetition factor (2, 4, or 8) based on the configuration order (e.g., {2,4,8}) of the three repetition factors (e.g., {2,4,8}).

[0312] According to an embodiment, the code point may be determined by a predefined number of bits (regardless of the number of multiple 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 the 2-bit code points (00, 01, 10, 11) based on the DAI field. The mapping between the code point and the multiple repetition factors may be applied in the same manner as described above.

[0313] Each of the four code points may be associated with each repetition factor determined based on the order of the multiple repetition factors. This is described in detail assuming that the order configured / indicated with two repetition factors 2 and 4 is {2,4}. The four code points 00, 01, 10, and 11 may be mapped to the two repetition factors 2 and 4 as follows.

[0314] For 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) may not be used (i.e., code points 10 and 11 (or code points 01 and 00) correspond to the reserved state of the method 1 proposed above).

[0315] In other words, if the value of the DAI field is 00 (or 11), the first repetition factor 2 of the two repetition factors 2 and 4 can be indicated. If the value of the DAI field is 01 (or 10), the second repetition factor 4 of the two repetition factors 2 and 4 can be indicated.

[0316] According to an embodiment, intra-slot frequency hopping may be applied to the repetition of PUCCH. For example, a pattern related to frequency hopping may be based on Figure 4 , Figure 7 and Figure 8 One of the implementation methods.

[0317] The operations based on the above steps S910 to S970 can be performed by Fig.11For example, the UE 200 may control one or more transceivers 230 and / or one or more memories 240 to perform operations based on steps S910 to S970.

[0318] In the method, some of the above steps S910 to S970 may be omitted. For example, the method may include steps S910, S950, S960, and S970.

[0319] The above implementation is described in detail below from the perspective of base station operation.

[0320] Steps S1010 to S1070 described below correspond to the steps in reference Fig. 9 In consideration of the above correspondence, redundant descriptions are omitted. That is, the detailed description of the base station operation described below can be used to correspond to the base station operation. Fig. 9 For example, Fig. 9 The description / implementation of steps S910 to S970 may be additionally applied to the base station operations of steps S1010 to S1070 described below.

[0321] Fig.10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0322] Reference Fig.10 According to another embodiment of the present disclosure, a method performed by a base station in a wireless communication system may include a SIB sending step S1010, a random access preamble receiving step S1020, a random access response sending step S1030, a PUSCH receiving step S1040, a DCI sending step S1050, a PDSCH sending step S1060 and a HARQ-ACK information receiving step S1070.

[0323] In step S1010, the base station sends a system information block (SIB) to the UE.

[0324] In step S1020, the base station receives a random access preamble from the UE. The random access preamble may be based on Msg1 of the type 1 random access procedure (see Table 1).

[0325] In step S1030, the base station sends a random access response (RAR) to the UE. The RAR may be based on Msg2 (see Table 1) of the type 1 random access procedure.

[0326] In step S1040, the base station receives a physical uplink shared channel (PUSCH) scheduled based on an uplink (UL) grant related to the RAR from the UE. The PUSCH may be based on Msg3 of the type 1 random access procedure.

[0327] In step S1050, the base station sends downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) to the UE.

[0328] In step S1060, the base station sends a PDSCH to the UE.

[0329] In step S1070, the base station receives hybrid automatic repeat request-acknowledgement (HARQ-ACK) information related to reception of the PDSCH from the UE. The HARQ-ACK information may be received based on repetition of a physical uplink control channel (PUCCH).

[0330] The operations based on the above steps S1010 to S1070 can be performed by Fig.11 For example, the base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform operations based on steps S1010 to S1070.

[0331] In the method, some of the above steps S1010 to S1070 may be omitted. For example, the method may include steps S1010, S1050, S1060, and S1070.

[0332] Refer to the following Fig.11 The following describes a device to which the embodiments of the present disclosure are applicable (a device that implements the method / operation according to the embodiments of the present disclosure).

[0333] Fig.11 The configurations of the first device and the second device according to the embodiment of the present disclosure are illustrated.

[0334] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0335] The processor 110 may perform signal processing related to the baseband, and includes a high-level processing unit 111 and a physical layer processing unit 115. The high-level processing unit 111 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 115 may process operations of a PHY layer. For example, if the first device 100 is a base station (BS) device in BS-UE communication, the physical layer processing unit 115 may perform uplink received signal processing, downlink transmitted signal processing, etc. For example, if the first device 100 is a first UE device in inter-UE communication, the physical layer processing unit 115 may perform downlink received signal processing, uplink transmitted signal processing, sidelink transmitted signal processing, etc. In addition to performing signal processing related to the baseband, the processor 110 may also control the overall operation of the first device 100.

[0336] The antenna unit 120 may include one or more physical antennas, and if the antenna unit 120 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110 and software, an operating system, and applications related to the operation of the first device 100. The memory 140 may also include components such as a buffer.

[0337] In the embodiments described in the present disclosure, the processor 110 of the first device 100 may be configured to implement operations of a BS in BS-UE communication (or operations of a first UE device in inter-UE communication).

[0338] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0339] The processor 210 may perform signal processing related to the baseband, and includes a high-level processing unit 211 and a physical layer processing unit 215. The high-level processing unit 211 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 215 may process operations of a PHY layer. For example, if the second device 200 is a UE device in BS-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, etc. For example, if the second device 200 is a second UE device in inter-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, side link received signal processing, etc. In addition to performing signal processing related to the baseband, the processor 210 may also control the overall operation of the second device 210.

[0340] The antenna unit 220 may include one or more physical antennas, and if the antenna unit 220 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210 and software, operating systems, and applications related to the operation of the second device 200. The memory 240 may also include components such as a buffer.

[0341] In the embodiments described in the present disclosure, the processor 210 of the second device 200 may be configured to implement operations of a UE in BS-UE communication (or operations of a second UE device in inter-UE communication).

[0342] The description of the BS and the UE in BS-UE communication (or the first UE device and the second UE device in inter-UE communication) in the examples of the present disclosure are equally applicable to the operations of the first device 100 and the second device 200, and redundant descriptions are omitted.

[0343] In addition to LTE, NR, and 6G, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may also include a narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. The NB-IoT technology is not limited to the above names.

[0344] Additionally or alternatively, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may perform communication based on the LTE-M technology. For example, the LTE-M technology may be an example of the LPWAN technology and may be referred to as various names, such as enhanced machine type communication (eMTC). For example, the LTE-M technology may be implemented with at least one of various standards, such as 1) LTE CAT0, 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. The LTE-M technology is not limited to the above names.

[0345] Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may include at least one of ZigBee, Bluetooth, and a low power wide area network (LPWAN), and is not limited to the above names. For example, ZigBee technology may create a personal area network (PAN) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

Claims

1. A method performed by a user equipment in a wireless communication system, the method comprising the following steps: Receiving a system information block SIB; Sending a random access preamble; Receiving a random access response RAR; Sending a physical uplink shared channel PUSCH scheduled based on an uplink UL grant associated with the RAR; Receiving downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; receiving the PDSCH; and sending hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is sent based on the repetition of the physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

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

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

4. The method according to claim 3, wherein: Each of the two code points is associated with each repetition factor determined based on an order of the plurality of repetition factors.

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

6. The method according to claim 5, wherein: Each of the four code points is associated with each repetition factor determined based on an order of the plurality of repetition factors.

7. The method according to claim 1, wherein: The SIB includes the parameter pucch-ResourceCommon, The parameter pucch-ResourceCommon is related to the PUCCH resource set before the dedicated PUCCH resource configuration. wherein the PUCCH resource set associated with the PUCCH is configured based on a row of a table, in which 16 rows constitute 16 PUCCH configurations, and Among the indices 0 to 15 representing the 16 rows, the value of the parameter pucch-ResourceCommon is based on one of the indices associated with a specific PUCCH format.

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

9. The method according to claim 7, wherein: Each of the PUCCH configurations includes at least one of the following: i) a PUCCH format, ii) a first symbol, iii) the number of symbols, iv) a physical resource block PRB offset, and / or v) a set of initial cyclic shift CS indices.

10. The method according to claim 7, wherein: Intra-slot frequency hopping is applied to the repetition of the PUCCH.

11. A user equipment operating in a wireless communication system, the user equipment comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: Receiving a system information block SIB; Sending a random access preamble; Receiving a random access response RAR; Sending a physical uplink shared channel PUSCH scheduled based on an uplink UL grant associated with the RAR; Receiving downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; receiving the PDSCH; and sending hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is sent based on the repetition of the physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

12. A device, comprising: one or more memories; as well as one or more processors operatively connected to the one or more memories, wherein the one or more memories include instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: Receiving a system information block SIB; Sending a random access preamble; Receiving a random access response RAR; Sending a physical uplink shared channel PUSCH scheduled based on an uplink UL grant associated with the RAR; Receiving downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; receiving the PDSCH; and sending hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is sent based on the repetition of the physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

13. One or more non-transitory computer-readable media storing one or more instructions, in, The one or more instructions executable by the one or more processors configure the one or more processors to perform operations, The operations include: Receiving a system information block SIB; Sending a random access preamble; Receiving a random access response RAR; Sending a physical uplink shared channel PUSCH scheduled based on an uplink UL grant associated with the RAR; Receiving downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; receiving the PDSCH; and sending hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is sent based on the repetition of the physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

14. A method performed by a base station in a wireless communication system, the method comprising the following steps: Sending system information block SIB; receiving a random access preamble; Send a random access response RAR; receiving a physical uplink shared channel (PUSCH) scheduled based on an uplink UL grant associated with the RAR; Sending downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; transmitting the PDSCH; and receiving hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is received based on repetition of a physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

15. A base station operating in a wireless communication system, the base station comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: Sending system information block SIB; receiving a random access preamble; Send a random access response RAR; receiving a physical uplink shared channel (PUSCH) scheduled based on an uplink UL grant associated with the RAR; Sending downlink control information DCI for scheduling a physical downlink shared channel PDSCH, wherein the PDSCH includes a contention resolution identifier ID; transmitting the PDSCH; and receiving hybrid automatic repeat request-acknowledgement HARQ-ACK information related to reception of the PDSCH, The HARQ-ACK information is received based on repetition of a physical uplink control channel PUCCH, wherein multiple repetition factors are configured based on the SIB, The DCI includes a downlink assignment index DAI field. wherein the repetition factor related to the PUCCH among the multiple repetition factors is indicated based on the DAI field, wherein the repetition factor associated with the PUCCH is indicated based on a code point, the code point being based on at least one of i) a first bit of the DAI field and / or ii) a second bit of the DAI field, and The code point is determined based on the number of the multiple repetition factors.

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