Method and apparatus for determining repetition factor of uplink control channel signal in non-terrestrial communication system

Abstract

The present disclosure is to configure a method for transmitting an uplink signal in a wireless communication system. A method performed by a base station comprises the steps of: transmitting, to a terminal, a message including information about candidates for a repetition factor indicating a repetition factor of an uplink control channel; receiving, from the terminal, a message including response information for configuring repetitive transmission of the uplink control channel; according to preset criteria for determining the repetition factor of the uplink control channel on the basis of the response information, determining the repetition factor of the uplink control channel; and receiving an uplink control channel signal from the terminal as much as the determined repetition factor of the uplink control channel.

Description

Method and device for determining repetition factor of uplink control channel signal in non-terrestrial communication system

[0001] The present disclosure relates to a device and method for setting up repetitive transmission of an uplink control channel signal in a non-terrestrial communication system, and more particularly, to a device and method for determining a repetition factor of an uplink control channel signal.

[0002] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide improved communication services compared to existing communication networks (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), etc.). 5G communication networks (e.g., new radio (NR) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support FR1 bands and / or FR2 bands. 5G communication networks can support various communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks can include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared to 5G, 6G communication networks can support a wider range of communication services and scenarios. 6G communication networks can meet requirements for ultra-high performance, ultra-high bandwidth, ultra-high space, ultra-high precision, ultra-intelligence, and / or ultra-reliability. 6G communication networks can support diverse and wide frequency bands and be applied to various usage scenarios (e.g., terrestrial communications, non-terrestrial communications, sidelink communications, etc.).

[0004] To improve coverage in non-terrestrial environments, various discussions have been ongoing at the Rel-18 NTN RAN#1 meeting. RAN1#110 reviewed coverage performance results for various physical channels and services in a baseline NTN environment. The results concluded that repeated transmission of the Physical Uplink Control Channel (PUCCH) for Msg4 HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) is necessary to meet coverage requirements.

[0005] In this repetitive transmission setup procedure, information related to a repetition factor indicating the number of times an uplink control channel signal is retransmitted may be signaled. However, since additional signaling is required to set up the repetitive transmission procedure for the uplink control channel signal, signaling overhead may occur. Therefore, a method for setting up repetitive transmission of an uplink control channel that can reduce signaling overhead is required.

[0006] Meanwhile, the technology that serves as the background for the invention is written to promote understanding of the background for the invention, and may include content that is not a prior art already known to a person with ordinary skill in the field to which the technology belongs.

[0007] The present disclosure may provide a device and method for setting a repetition factor for repeated transmission of an uplink control channel without using additional signaling in a communication system.

[0008] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0009] As an example of the present disclosure, a method of operating a base station in a wireless communication system may include the steps of transmitting a message including information on candidates of a repetition factor indicating a number of times of repeated transmission of an uplink control channel to a terminal, receiving a message including response information for setting repeated transmission of an uplink control channel from the terminal, determining a repetition factor of the uplink control channel based on the response information according to a preset criterion for determining the repetition factor of the uplink control channel, and receiving an uplink control channel signal from the terminal by the number of repetition factors of the uplink control channel determined.

[0010] Here, the response information may be characterized by including information for requesting repeated transmission of the uplink control channel.

[0011] Here, the response information may be characterized by including information indicating whether the terminal supports repeated transmission of the uplink control channel, which is information distinct from information for requesting repeated transmission of the uplink control channel.

[0012] Here, the repetition factor of the uplink control channel may be determined based on statistical values ​​of candidates for the repetition factor according to the preset criteria.

[0013] Here, the repetition factor of the uplink control channel may be determined based on the number of times the response message is repeatedly transmitted, according to the preset criteria.

[0014] Here, a step of signaling information indicating a repetition factor of the uplink control channel to the terminal may be further included.

[0015] Here, the step of signaling information indicating a repetition factor of the uplink control channel to the terminal may include a step of determining whether to signal information indicating a repetition factor of the uplink control channel based on candidates of the repetition factor and the response information, a step of mapping at least some of the candidates of the repetition factor to code points based on the signaling, and a step of signaling information indicating the determined repetition factor of the uplink control channel using the code points.

[0016] Here, the step of mapping at least some of the candidates of the repetition factor to code points may be characterized by mapping a number of candidates of the repetition factor determined based on the number of bits of an information field indicating the repetition factor of the uplink control channel to code points.

[0017] Here, the step of mapping at least some of the candidates of the repetition factor to code points may be characterized by mapping the candidates of the repetition factor to code points based on priorities of the at least some of the candidates of the repetition factor.

[0018] As an example of the present disclosure, a method of operating a terminal in a wireless communication system may include the steps of receiving a message including information on candidates of a repetition factor indicating a repetition factor of an uplink control channel from a base station, transmitting a message including response information for setting up repeated transmission of an uplink control channel to the base station, and determining a repetition factor of the uplink control channel based on the response information according to a preset criterion for determining the repetition factor of the uplink control channel, and transmitting an uplink control channel signal from the terminal by the determined repetition factor of the uplink control channel.

[0019] Here, the response information may be characterized by including information for requesting repeated transmission of the uplink control channel.

[0020] Here, the response information may be characterized by including information indicating whether the terminal supports repeated transmission of the uplink control channel, which is information distinct from information for requesting repeated transmission of the uplink control channel.

[0021] Here, the repetition factor of the uplink control channel may be determined based on statistical values ​​of candidates for the repetition factor according to the preset criteria.

[0022] Here, the repetition factor of the uplink control channel may be determined based on the number of times the response message is repeatedly transmitted, according to the preset criteria.

[0023] Here, the step of receiving information indicating a repetition factor of the uplink control channel from the base station may be further included.

[0024] Here, the method may further include a step of mapping at least some of the candidates of the repetition factor to code points, and the repetition factor of the uplink control channel may be set based on information indicating the repetition factor of the uplink control channel using the code points.

[0025] Here, the step of mapping at least some of the candidates of the repetition factor to code points may be characterized by mapping a number of candidates of the repetition factor determined based on the number of bits of an information field indicating the repetition factor of the uplink control channel to code points.

[0026] Here, the step of mapping at least some of the candidates of the repetition factor to code points may be characterized by mapping the candidates of the repetition factor to code points based on priorities of the at least some of the candidates of the repetition factor.

[0027] As an example of the present disclosure, a base station operating in a wireless communication system includes at least one transmitter, at least one receiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, wherein the specific operation comprises: transmitting a message including information regarding candidates of a repetition factor indicating a number of times of repeated transmission of an uplink control channel to a terminal, receiving a message including response information for setting repeated transmission of the uplink control channel from the terminal, determining a repetition factor of the uplink control channel based on the response information according to a preset criterion for determining the repetition factor of the uplink control channel, and receiving an uplink control channel signal from the terminal by the determined repetition factor of the uplink control channel.

[0028] As an example of the present disclosure, in a wireless communication system, a terminal includes at least one transmitter, at least one receiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, wherein the specific operation comprises: receiving a message including information about candidates of a repetition factor indicating a repetition factor of an uplink control channel from a base station; transmitting a message including response information for setting up repeated transmission of the uplink control channel to the base station; determining the repetition factor of the uplink control channel based on the response information according to a preset criterion for determining the repetition factor of the uplink control channel; and transmitting an uplink control channel signal from the terminal by the determined repetition factor of the uplink control channel.

[0029] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0030] The following effects may be achieved by embodiments based on the present disclosure.

[0031] The present disclosure may provide a device and method for setting a repetition factor for repeated transmission of an uplink control channel without using additional signaling in a communication system.

[0032] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects resulting from implementing the configuration described in the present disclosure can also be derived by those skilled in the art from the embodiments of the present disclosure.

[0033] The accompanying drawings are intended to aid in understanding the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0034] Figure 1a is a conceptual diagram illustrating a first embodiment of a non-terrestrial network.

[0035] Figure 1b is a conceptual diagram illustrating a second embodiment of a non-terrestrial network.

[0036] Figure 2a is a conceptual diagram illustrating a third embodiment of a non-terrestrial network.

[0037] Figure 2b is a conceptual diagram illustrating a fourth embodiment of a non-terrestrial network.

[0038] Figure 2c is a conceptual diagram illustrating a fifth embodiment of a non-terrestrial network.

[0039] FIG. 3 is a block diagram illustrating a first embodiment of a communication node constituting a non-terrestrial network.

[0040] Figure 4 is a block diagram illustrating a first embodiment of communication nodes performing communication.

[0041] Figure 5a is a block diagram illustrating a first embodiment of a transmission path.

[0042] Figure 5b is a block diagram illustrating a first embodiment of a receiving path.

[0043] FIG. 6a is a conceptual diagram illustrating a first embodiment of a protocol stack of a user plane in a non-terrestrial network based on transparent payload.

[0044] FIG. 6b is a conceptual diagram illustrating a first embodiment of a protocol stack of a control plane in a non-terrestrial network based on transparent payload.

[0045] FIG. 7a is a conceptual diagram illustrating a first embodiment of a protocol stack of a user plane in a non-terrestrial network based on regenerative payload.

[0046] FIG. 7b is a conceptual diagram illustrating a first embodiment of a protocol stack of a control plane in a non-terrestrial network based on regenerative payload.

[0047] Figure 8 is a conceptual diagram illustrating an embodiment of a 4-Step RACH (random access channel) procedure.

[0048] FIG. 9 is a conceptual diagram illustrating one embodiment of a non-repeatedly transmitted uplink control channel and a repetitively transmitted uplink control channel.

[0049] FIG. 10 is a diagram illustrating an embodiment of a repetitive transmission procedure of an uplink control channel for coverage improvement in an NTN environment.

[0050] FIG. 11 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0051] FIG. 12 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0052] FIG. 13 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0053] FIG. 14 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0054] FIG. 15 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0055] FIG. 16 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0056] FIG. 17 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0057] FIG. 18 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0058] FIG. 19 is a diagram illustrating a method for determining and signaling a repetition factor according to the present disclosure.

[0059] FIG. 20 is a diagram illustrating a method for checking initial conditions for determining a repetition factor according to the present disclosure.

[0060] FIG. 21 is a diagram illustrating an operation of determining and signaling a repetition factor according to the present disclosure.

[0061] FIG. 22 is a diagram illustrating an operation of determining and signaling a repetition factor according to the present disclosure.

[0062] FIG. 23 is a diagram illustrating an operation of determining and signaling a repetition factor according to the present disclosure.

[0063] FIG. 24 is a diagram illustrating an operation for determining and signaling a repetition factor according to the present disclosure.

[0064] FIG. 25 illustrates an example of a procedure for a method of setting a repetition factor of an uplink control channel signal according to one embodiment of the present disclosure.

[0065] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0066] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" may refer to a combination of multiple related items described herein or to any of multiple related items described herein.

[0067] In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Additionally, in the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.”

[0068] In the present disclosure, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission,” (re)setting may mean “setting,” “resetting,” or “setting and resetting,” (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”

[0069] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0070] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0071] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0072] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, the same reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted. In addition to the embodiments explicitly described in the present disclosure, operations may be performed according to combinations of embodiments, extensions of embodiments, and / or modifications of embodiments. The performance of some operations may be omitted, and the order of operation may be changed.

[0073] In an embodiment, even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. That is, if an operation of a UE (user equipment) is described, a corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, if an operation of a base station is described, a corresponding UE can perform an operation corresponding to the operation of the base station.

[0074] A base station may be referred to as a NodeB, an evolved NodeB, a gNodeB (next generation node B), a gNB, a device, an apparatus, a node, a communication node, a BTS (base transceiver station), a RRH (radio remote head), a TRP (transmission reception point), a RU (radio unit), an RSU (road side unit), a radio transceiver, an access point, an access node, etc. A UE may be referred to as a terminal, a device, an apparatus, a node, a communication node, an end node, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, an OBU (on-broad unit), etc.

[0075] In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or PHY (physical) signaling. A message used for upper layer signaling may be referred to as an "upper layer message" or an "upper layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper layer signaling may refer to a transmission and reception operation of system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to a transmission and reception operation of a MAC control element (CE). PHY signaling may refer to a transmission and reception operation of control information (e.g., downlink control information (DCI), uplink control information (UCI), sidelink control information (SCI)).

[0076] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., an information element, a parameter)” and / or “information instructing the performance of the operation” is signaled. “An information element (e.g., a parameter) is set” may mean that the information element is signaled. In the present disclosure, “a signal and / or a channel” may mean a signal, a channel, or “a signal and a channel,” and a signal may be used to mean “a signal and / or a channel.”

[0077] The communication network to which the embodiment is applied is not limited to what is described below, and the embodiment may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the communication network may be used in the same sense as the communication system.

[0078] Figure 1a is a conceptual diagram illustrating a first embodiment of a non-terrestrial network.

[0079] Referring to FIG. 1A, a non-terrestrial network may include a satellite (110), a communication node (120), a gateway (130), a data network (140), etc. The unit including the satellite (110) and the gateway (130) may be a remote radio unit (RRU). The non-terrestrial network illustrated in FIG. 1A may be a transparent payload-based non-terrestrial network. The satellite (110) may be a low Earth orbit (LEO) satellite, a medium Earth orbit (MEO) satellite, a geostationary Earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, or an unmanned aircraft system (UAS) platform. The UAS platform may include a high altitude platform station (HAPS). The non-GEO satellite may be a LEO satellite and / or a MEO satellite.

[0080] The communication node (120) may include a communication node located on the ground (e.g., a UE, terminal) and a communication node located off the ground (e.g., an airplane, a drone). A service link may be established between the satellite (110) and the communication node (120), and the service link may be a radio link. The satellite (110) may be referred to as an NTN payload. The gateway (130) may support multiple NTN payloads. The satellite (110) may provide a communication service to the communication node (120) using one or more beams. The shape of the reception range (footprint) of the beam of the satellite (110) may be elliptical or circular.

[0081] In non-terrestrial networks, three types of service links can be supported:

[0082] - Earth-fixed: The service link may be provided by beam(s) that continuously cover the same geographic area at all times (e.g., Geosynchronous Orbit (GSO) satellites).

[0083] - Quasi-earth-fixed: The service link may be provided by beam(s) that cover one geographic area for a limited period and another geographic area for another period (e.g., NGSO (non-GSO) satellites that produce steerable beams).

[0084] - Earth-moving: The service link may be provided by beam(s) moving over the Earth's surface (e.g., NGSO satellites producing fixed beams or non-steerable beams).

[0085] The communication node (120) can perform communication (e.g., downlink communication, uplink communication) with the satellite (110) using 4G communication technology, 5G communication technology, and / or 6G communication technology. Communication between the satellite (110) and the communication node (120) can be performed using an NR-Uu interface and / or a 6G-Uu interface. When DC (dual connectivity) is supported, the communication node (120) can be connected to not only the satellite (110) but also other base stations (e.g., base stations supporting 4G functions, 5G functions, and / or 6G functions), and can perform DC operations based on technologies defined in the 4G standard, the 5G standard, and / or the 6G standard.

[0086] The gateway (130) may be located on the ground, and a feeder link may be established between the satellite (110) and the gateway (130). The feeder link may be a wireless link. The gateway (130) may be referred to as a "non-terrestrial network (NTN) gateway." Communication between the satellite (110) and the gateway (130) may be performed based on an NR-Uu interface, a 6G-Uu interface, or a satellite radio interface (SRI). The gateway (130) may be connected to a data network (140). A "core network" may exist between the gateway (130) and the data network (140). In this case, the gateway (130) may be connected to the core network, and the core network may be connected to the data network (140). The core network may support 4G communication technology, 5G communication technology, and / or 6G communication technology. For example, the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc. Communication between the gateway (130) and the core network may be performed based on a NG-C / U interface or a 6G-C / U interface.

[0087] As in the embodiment of Fig. 1b below, in a non-terrestrial network based on transparent payload, a base station and a core network may exist between a gateway (130) and a data network (140).

[0088] Figure 1b is a conceptual diagram illustrating a second embodiment of a non-terrestrial network.

[0089] Referring to FIG. 1B, a gateway may be connected to a base station, the base station may be connected to a core network, and the core network may be connected to a data network. Each of the base station and the core network may support 4G communication technology, 5G communication technology, and / or 6G communication technology. Communication between the gateway and the base station may be performed based on a NR-Uu interface or a 6G-Uu interface, and communication between the base station and the core network (e.g., AMF, UPF, SMF) may be performed based on a NG-C / U interface or a 6G-C / U interface.

[0090] Figure 2a is a conceptual diagram illustrating a third embodiment of a non-terrestrial network.

[0091] Referring to FIG. 2A, the non-terrestrial network may include satellite #1 (211), satellite #2 (212), communication node (220), gateway (230), data network (1240), etc. The non-terrestrial network illustrated in FIG. 2A may be a regenerative payload-based non-terrestrial network. For example, each of satellite #1 (211) and satellite #2 (212) may perform a regenerative operation (e.g., a demodulation operation, a decoding operation, a re-encoding operation, a re-modulation operation, and / or a filtering operation) on a payload received from another entity constituting the non-terrestrial network (e.g., a communication node (220), a gateway (230)) and transmit the regenerated payload.

[0092] Each of satellite #1 (211) and satellite #2 (212) may be a LEO satellite, MEO satellite, GEO satellite, HEO satellite, or UAS platform. The UAS platform may include HAPS. Satellite #1 (211) may be connected to satellite #2 (212), and an inter-satellite link (ISL) may be established between satellite #1 (211) and satellite #2 (212). The ISL may operate in a radio frequency (RF) frequency or an optical band. The ISL may be configured as optional. The communication node (220) may include a ground-based communication node (e.g., UE, terminal) and a non-ground-based communication node (e.g., an airplane, a drone). A service link (e.g., a wireless link) may be established between satellite #1 (211) and the communication node (220). Satellite #1 (211) may be referred to as an NTN payload. Satellite #1 (211) can provide communication services to a communication node (220) using one or more beams.

[0093] The communication node (220) can perform communication (e.g., downlink communication, uplink communication) with satellite #1 (211) using 4G communication technology, 5G communication technology, and / or 6G communication technology. Communication between satellite #1 (211) and the communication node (220) can be performed using an NR-Uu interface or a 6G-Uu interface. When DC is supported, the communication node (220) can be connected to not only satellite #1 (211) but also other base stations (e.g., base stations supporting 4G functions, 5G functions, and / or 6G functions), and can perform DC operations based on technologies defined in the 4G standard, the 5G standard, and / or the 6G standard.

[0094] The gateway (230) may be located on the ground, and a feeder link may be established between satellite #1 (211) and the gateway (230), and a feeder link may be established between satellite #2 (212) and the gateway (230). The feeder link may be a wireless link. If an ISL is not established between satellite #1 (211) and satellite #2 (212), a feeder link between satellite #1 (211) and the gateway (230) may be established mandatorily. Communication between each of satellite #1 (211) and satellite #2 (212) and the gateway (230) may be performed based on an NR-Uu interface, a 6G-Uu interface, or SRI. The gateway (230) may be connected to a data network (240).

[0095] As in the embodiments of FIGS. 2b and 2c below, a “core network” may exist between the gateway (230) and the data network (240).

[0096] Figure 2b is a conceptual diagram illustrating a fourth embodiment of a non-terrestrial network, and Figure 2c is a conceptual diagram illustrating a fifth embodiment of a non-terrestrial network.

[0097] Referring to FIGS. 2B and 2C, a gateway may be connected to a core network, and the core network may be connected to a data network. The core network may support 4G communication technology, 5G communication technology, and / or 6G communication technology. For example, the core network may include AMF, UPF, SMF, etc. Communication between the gateway and the core network may be performed based on an NG-C / U interface or a 6G-C / U interface. The function of a base station may be performed by a satellite. That is, a base station may be located on a satellite. Payloads may be processed by a base station located on a satellite. Base stations located on different satellites may be connected to the same core network. A single satellite may have one or more base stations. In the non-terrestrial network of FIG. 2B, an ISL between satellites may not be established, and in the non-terrestrial network of FIG. 2C, an ISL between satellites may be established.

[0098] Meanwhile, entities (e.g., satellites, base stations, UEs, communication nodes, gateways, etc.) constituting the non-terrestrial network illustrated in FIGS. 1a, 1b, 2a, 2b, and / or 2c may be configured as follows. In the present disclosure, entities may be referred to as communication nodes.

[0099] FIG. 3 is a block diagram illustrating a first embodiment of a communication node constituting a non-terrestrial network.

[0100] Referring to FIG. 3, a communication node (300) may include at least one processor (310), a memory (320), and a transmission / reception device (330) that is connected to a network and performs communication. In addition, the communication node (300) may further include an input interface device (340), an output interface device (350), a storage device (360), etc. Each component included in the communication node (300) may be connected by a bus (370) and communicate with each other.

[0101] However, each component included in the communication node (300) may be connected through an individual interface or individual bus centered around the processor (310), rather than a common bus (370). For example, the processor (310) may be connected to at least one of a memory (320), a transmission / reception device (330), an input interface device (340), an output interface device (350), or a storage device (360) through a dedicated interface.

[0102] The processor (310) can execute program commands stored in at least one of the memory (320) and the storage device (360). The processor (310) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the methods according to the embodiments are performed. Each of the memory (320) and the storage device (360) may be configured with at least one of a volatile storage medium or a non-volatile storage medium. For example, the memory (320) may be configured with at least one of a read-only memory (ROM) or a random access memory (RAM).

[0103] Meanwhile, communication nodes performing communication in a communication network (e.g., a non-terrestrial network) may be configured as follows. The communication node illustrated in FIG. 4 may be a specific embodiment of the communication node illustrated in FIG. 3.

[0104] Figure 4 is a block diagram illustrating a first embodiment of communication nodes performing communication.

[0105] Referring to FIG. 4, each of the first communication node (400a) and the second communication node (400b) may be a base station or a UE. The first communication node (400a) may transmit a signal to the second communication node (400b). The transmission processor (411) included in the first communication node (400a) may receive data (e.g., a data unit) from a data source (410). The transmission processor (411) may receive control information from a controller (416). The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0106] The transmitting processor (411) may perform a processing operation on data (e.g., an encoding operation, a symbol mapping operation, etc.) to generate data symbol(s). The transmitting processor (411) may perform a processing operation on control information (e.g., an encoding operation, a symbol mapping operation, etc.) to generate control symbol(s). In addition, the transmitting processor (411) may generate synchronization / reference symbol(s) for a synchronization signal and / or a reference signal.

[0107] The Tx MIMO processor (412) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or synchronization / reference symbol(s). An output (e.g., a symbol stream) of the Tx MIMO processor (412) may be provided to modulators (MODs) included in the transceivers (413a to 413t). The modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (413a to 413t) may be transmitted via the antennas (414a to 414t).

[0108] Signals transmitted by the first communication node (400a) may be received by antennas (464a to 464r) of the second communication node (400b). Signals received by the antennas (464a to 464r) may be provided to demodulators (DEMODs) included in transceivers (463a to 463r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (462) may perform a MIMO detection operation on the symbols. The receiving processor (461) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (461) may be provided to a data sink (460) and a controller (466). For example, data may be provided to the data sink (460) and control information may be provided to the controller (466).

[0109] Meanwhile, the second communication node (400b) can transmit a signal to the first communication node (400a). The transmitting processor (468) included in the second communication node (400b) can receive data (e.g., data units) from a data source (467) and perform a processing operation on the data to generate data symbol(s). The transmitting processor (468) can receive control information from the controller (466) and perform a processing operation on the control information to generate control symbol(s). In addition, the transmitting processor (468) can perform a processing operation on a reference signal to generate reference symbol(s).

[0110] The Tx MIMO processor (469) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or reference symbol(s). The output (e.g., symbol stream) of the Tx MIMO processor (469) may be provided to modulators (MODs) included in the transceivers (463a to 463t). The modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (463a to 463t) may be transmitted via the antennas (464a to 464t).

[0111] Signals transmitted by the second communication node (400b) may be received by the antennas (414a to 414r) of the first communication node (400a). The signals received by the antennas (414a to 414r) may be provided to demodulators (DEMODs) included in the transceivers (413a to 413r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (420) may perform a MIMO detection operation on the symbols. The receiving processor (419) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (419) may be provided to a data sink (418) and a controller (416). For example, data may be provided to the data sink (418) and control information may be provided to the controller (416).

[0112] Memories (415 and 465) can store data, control information, and / or program code. Scheduler (417) can perform scheduling operations for communication. Processors (411, 412, 419, 461, 468, 469) and controllers (416, 466) illustrated in FIG. 4 may be the processor (310) illustrated in FIG. 3 and may be used to perform the methods described in the present disclosure.

[0113] FIG. 5a is a block diagram illustrating a first embodiment of a transmission path, and FIG. 5b is a block diagram illustrating a first embodiment of a reception path.

[0114] Referring to FIGS. 5A and 5B, a transmission path (510) may be implemented in a communication node that transmits a signal, and a reception path (520) may be implemented in a communication node that receives a signal. The transmission path (510) may include a channel coding and modulation block (511), a serial-to-parallel (S-to-P) block (512), an Inverse Fast Fourier Transform (N IFFT) block (513), a parallel-to-serial (P-to-S) block (514), a cyclic prefix (CP) addition block (515), and an up-converter (UC) (516). The receiving path (520) may include a DC (down-converter) (521), a CP removal block (522), an S-to-P block (523), an N FFT block (524), a P-to-S block (525), and a channel decoding and demodulation block (526). Here, N may be a natural number.

[0115] In the transmission path (510), information bits may be input to a channel coding and modulation block (511). The channel coding and modulation block (511) may perform a coding operation (e.g., a low-density parity check (LDPC) coding operation, a polar coding operation, etc.) and a modulation operation (e.g., a quadrature phase shift keying (QPSK), a quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block (511) may be a sequence of modulation symbols.

[0116] The S-to-P block (512) can convert modulation symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams. N can be an IFFT size or an FFT size. The N IFFT block (513) can perform an IFFT operation on the N parallel symbol streams to generate signals in the time domain. The P-to-S block (514) can convert the output (e.g., parallel signals) of the N IFFT block (513) into a serial signal to generate a serial signal.

[0117] The CP addition block (515) can insert a CP into a signal. The UC (516) can up-convert the frequency of the output of the CP addition block (515) to an RF (radio frequency) frequency. Additionally, the output of the CP addition block (515) can be filtered at the baseband before up-conversion.

[0118] A signal transmitted from a transmission path (510) may be input to a reception path (520). An operation in the reception path (520) may be the reverse operation of the operation in the transmission path (510). A DC (521) may down-convert the frequency of the received signal to a baseband frequency. A CP removal block (522) may remove a CP from a signal. The output of the CP removal block (522) may be a serial signal. An S-to-P block (523) may convert the serial signal into parallel signals. An NFFT block (524) may perform an FFT algorithm to generate N parallel signals. A P-to-S block (525) may convert the parallel signals into a sequence of modulation symbols. A channel decoding and demodulation block (526) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore data.

[0119] In FIGS. 5A and 5B , Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. Each of the blocks (e.g., components) in FIGS. 5A and 5B may be implemented by at least one of hardware, software, or firmware. For example, some of the blocks in FIGS. 5A and 5B may be implemented by software, and the remaining blocks may be implemented by hardware or a “combination of hardware and software.” In FIGS. 5A and 5B , a single block may be subdivided into multiple blocks, multiple blocks may be integrated into a single block, some blocks may be omitted, and blocks supporting other functions may be added.

[0120] Meanwhile, NTN reference scenarios can be defined as shown in [Table 1] below.

[0121]

[0122] In the non-terrestrial network illustrated in FIG. 1a and / or FIG. 1b, if the satellite (110) is a GEO satellite (e.g., a GEO satellite supporting transparent functionality), this may be referred to as “Scenario A.” In the non-terrestrial network illustrated in FIG. 2a, FIG. 2b, and / or FIG. 2c, if each of satellite #1 (211) and satellite #2 (212) is a GEO satellite (e.g., a GEO supporting regeneration functionality), this may be referred to as “Scenario B.”

[0123] If the satellite (110) in the non-terrestrial network illustrated in FIG. 1a and / or FIG. 1b is a LEO satellite having steerable beams, this may be referred to as “Scenario C1.” If the satellite (110) in the non-terrestrial network illustrated in FIG. 1a and / or FIG. 1b is a LEO satellite having beams move with the satellite, this may be referred to as “Scenario C2.” If each of satellite #1 (211) and satellite #2 (212) in the non-terrestrial network illustrated in FIG. 2a, FIG. 2b, and / or FIG. 2c is a LEO satellite having steerable beams, this may be referred to as “Scenario D1.” In the non-terrestrial network illustrated in FIG. 2a, FIG. 2b, and / or FIG. 2c, if each of satellite #1 (211) and satellite #2 (212) is a LEO satellite having beams that travel with the satellite, this may be referred to as “Scenario D2.”

[0124] Parameters for the NTN reference scenarios defined in [Table 1] can be defined as shown in [Table 2] below.

[0125]

[0126] Additionally, in the NTN reference scenario defined in [Table 1], the delay constraint can be defined as in [Table 3] below.

[0127]

[0128] FIG. 6a is a conceptual diagram illustrating a first embodiment of a protocol stack of a user plane in a non-terrestrial network based on transparent payload, and FIG. 6b is a conceptual diagram illustrating a first embodiment of a protocol stack of a control plane in a non-terrestrial network based on transparent payload.

[0129] Referring to FIGS. 6A and 6B, user data may be transmitted and received between a UE and a core network (e.g., UPF), and control data (e.g., control information) may be transmitted and received between a UE and a core network (e.g., AMF). Each of the user data and the control data may be transmitted and received via a satellite and / or a gateway. The protocol stack of the user plane illustrated in FIG. 6A may be applied identically or similarly to a 6G communication network. The protocol stack of the control plane illustrated in FIG. 6B may be applied identically or similarly to a 6G communication network.

[0130] FIG. 7a is a conceptual diagram illustrating a first embodiment of a protocol stack of a user plane in a non-terrestrial network based on regenerative payload, and FIG. 7b is a conceptual diagram illustrating a first embodiment of a protocol stack of a control plane in a non-terrestrial network based on regenerative payload.

[0131] Referring to FIGS. 7A and 7B , user data and control data (e.g., control information) may be transmitted and received through an interface between a UE and a satellite (e.g., a base station). User data may refer to a user protocol data unit (PDU). The protocol stack of the satellite radio interface (SRI) may be used to transmit and receive user data and / or control data between the satellite and the gateway. User data may be transmitted and received through a GTP (GPRS (general packet radio service) tunneling protocol)-U tunnel between the satellite and the core network.

[0132] Meanwhile, in a non-terrestrial network, a base station may transmit system information (e.g., SIB19) containing satellite assistance information for NTN access. A UE may receive system information (e.g., SIB19) from the base station, verify the satellite assistance information included in the system information, and perform communication (e.g., non-terrestrial communication) based on the satellite assistance information. SIB19 may include the information element(s) defined in [Table 4] below.

[0133]

[0134] NTN-Config defined in [Table 4] may include information element(s) defined in [Table 5] below.

[0135]

[0136] EphemerisInfo defined in [Table 5] may include information element(s) defined in [Table 6] below.

[0137]

[0138] Coverage Enhancement in Non-Terrestrial Network (NTN) environments has been selected as a Rel-18 Work Item and has been extensively discussed at the Rel-18 NTN RAN#1 meeting. In RAN1#110, coverage-related performance results for various physical channels and services in a baseline NTN environment were reviewed. As a result, it was concluded that the Physical Uplink Control Channel (PUCCH) for Msg4 HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) needs to be enhanced to meet coverage requirements. The PUCCH transmission operation for Msg4 HARQ-ACK can be configured and performed according to the procedures described below.

[0139] Figure 8 is a conceptual diagram illustrating an embodiment of a 4-Step RACH (random access channel) procedure.

[0140] Referring to FIG. 8, Msg4 HARQ-ACK may be a signal transmitted by a terminal to a base station to indicate that an uplink 4-Step RACH (Random Access Procedure) has been successfully performed. The situation illustrated in FIG. 8 may be a situation in which a normal RRC connection establishment procedure has not been completed. To transmit Msg4 HARQ-ACK of FIG. 8, a common PUCCH resource may be used instead of a dedicated PUCCH resource dedicated to each terminal.

[0141] Although the Rel-18 RAN1 meeting only performed performance verification on Msg4 HARQ-ACK in 4-Step RACH, the common PUCCH resources used to transmit Msg4 HARQ-ACK can continue to be used until dedicated PUCCH resources are allocated to UEs. Therefore, a method to improve coverage for subsequent transmissions based on common PUCCH resources was agreed upon. A specific technique for improving coverage was the application of repeated transmission. The repeated transmission technique for improving coverage can be as described below.

[0142] FIG. 9 is a conceptual diagram illustrating one embodiment of a non-repeatedly transmitted uplink control channel and a repetitively transmitted uplink control channel.

[0143] Referring to FIG. 9, when transmitting four PUCCH symbols per slot, examples of normal transmission (without repeated transmission) and examples of two repeated transmissions are illustrated. When repeated transmission is performed as in FIG. 2, the same symbols are repeatedly transmitted temporally using additional slots.

[0144] The procedures for setting up repetitive transmissions to improve NTN coverage, agreed upon at the Rel-18 meeting, may be as described below.

[0145] FIG. 10 is a diagram illustrating an embodiment of a repetitive transmission procedure of an uplink control channel for coverage improvement in an NTN environment.

[0146] Referring to Fig. 10, first, in the SIB (System Information Block), 1) the RSRP (Reference Signal Received Power) threshold, which serves as the criterion for repeated transmission, and 2) the repetition factor candidates that can be supported by each base station can be set. Here, the repetition factors that can be supported for NR NTN in Rel-18 have been agreed upon as {1,2,4,8}.

[0147] If repetition factor candidates are set in the SIB, each terminal can transmit a repetition request message via Msg3 depending on whether it supports repetition transmission (capability), whether an RSRP threshold is set in the SIB, and the comparison result between the measured RSRP and the RSRP threshold.

[0148] And, the base station that receives the repetition request related information from the terminal can determine the number of repetitions to be performed by each terminal and transmit repetition factor information regarding the number of repetitions through the DAI (Downlink Assignment Index) field of the DCI (Downlink Control Information). Here, the transmitted repetition factor can be selected from the repetition factor candidates transmitted in the SIB. The terminal can perform repeated transmission starting from the Msg4-HARQ ACK depending on whether it supports it or not based on the DAI field of the DCI.

[0149] On the other hand, if the repetition factor candidates are not set in the SIB, the legacy operation up to Rel-17 is performed, and the operation related to the repeated transmission of the uplink control channel signal may not be performed. In this case, the repetition request may be conveyed as two state information. Here, the first state (State 1) may indicate a repetition request, and the zeroth state (State 0) may indicate a no repetition request (No indication). The repetition request and the capability report may not be distinguished in signaling.

[0150] That is, the procedure for setting up repeated transmission of an uplink control channel to improve coverage in an NTN environment can be as shown in the table below.

[0151]

[0152] According to the RAN1 meeting for Rel-18, information about the repetition factor of the uplink control channel can be transmitted via DCI format 1_0 with CRC (cyclic redundancy check) scrambled by the TC-RNTI in Msg4. Here, the information about the repetition factor can be allocated to the 2-bit DAI field that was reserved in that situation. Currently, a total of four supportable repetition factors (1, 2, 4, 8) can be set to improve Rel-18 NR NTN coverage.

[0153] According to RAN1#114b, the way of assigning bits and code points to each repetition factor may be as described below. Always using 2 bits, '00', '01', '10', and '11' may be assigned to the first / second / third / fourth repetition factors, respectively. However, if the number of supportable repetition counts of SIB is 2 or less, certain code points (e.g., '10' or '11') may not be used.

[0154] Accordingly, according to the present disclosure, a method and procedure for determining the number of repetitions between a base station and a terminal to improve coverage in an NTN environment can be provided. To explain the proposed techniques, the following mathematical notations are first defined.

[0155] R total : A set of repeat factors that can be assigned for PUCCH transmission based on Msg4 HARQ-ACK and common PUCCH resource as defined in the standard, Rel-18 standard R total = {1, 2, 4, 8}.

[0156] R SIB (⊂ R total ): Represents a set of candidates for the number of repetitions set by the base station through SIB.

[0157] |R SIB |: R SIB The size of the set represents the number of iteration candidates that are actually being transmitted through the SIB.

[0158] r i : The number of repetitions set to the i-th time in SIB, R SIB of i(1≤i≤|R SIB is the |)th element. That is, R SIB = {r1, ... , r |RSIB|}am.

[0159] S1: Indicates the first state (repeat request or repeat transmission support) in the two-state information for transmitting a repeat request.

[0160] S0: Indicates state 0 (repeat not requested and / or repeat transmission not supported) in the 2-state information for transmitting repeat requests.

[0161] According to one embodiment of the present disclosure, a method for determining the number of repetitions without signaling the repetition factor is proposed. The method for determining the number of repetitions without signaling the repetition factor may be as described below.

[0162] FIG. 11 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0163] According to FIG. 11, in step S1101, the base station can receive repetition request information and determine whether the repetition request information transmitted by the terminal is in the S1 state. However, the base station may not be able to separately determine whether the terminal supports repetition transmission. In this case, there may be a situation where separate capability information (Capability Information) distinct from the 2-state repetition request information is not signaled. That is, as agreed upon in Rel-18, capability information and repetition request information may not be distinguished in signaling. In this case, even if the base station receives repetition request information in the S0 state from the terminal, it cannot distinguish whether the terminal does not support repetition transmission or supports repetition transmission but does not request repetition.

[0164] If the status of the repetition request information is S0, i.e., if a repetition request is not indicated, the measured RSRP value may be higher than the RSRP threshold, or the terminal may not support uplink control channel repetition transmission. Considering this, in step S1102, the base station may determine R=1 as the repetition factor of the terminal so as not to perform uplink control channel repetition transmission. However, the base station may not separately transmit the repetition factor information of the terminal to the terminal through signaling such as DCI.

[0165] If a terminal supporting uplink control channel repetition transmission transmits the status value of repetition request information of S0 (No Indication), the terminal can set the repetition factor to R=1 and transmit an uplink control channel signal without being specifically notified of the number of repetitions through signaling prior to proceeding with Msg4 HARQ-ACK and common PUCCH resource PUCCH transmission.

[0166] On the other hand, for a terminal that does not support uplink channel repetition transmission, repetition transmission is not performed, and thus an uplink control channel signal can be transmitted in a form that is essentially the same as setting the repetition factor to R=1.

[0167] In contrast, if the status of the repetition request information is S1, i.e., indicating a repetition request, the RSRP measurement value of the terminal supporting uplink control channel repetition transmission may be lower than the RSRP threshold, or the RSRP threshold may not be set in the SIB. Consequently, the channel quality between the base station and the terminal supporting uplink control channel repetition transmission may be poor. Therefore, in step S1103, the base station may configure the terminal to perform uplink control channel repetition transmission.

[0168] Base stations and terminals that have set up repeat transmission can set repetition factors according to preset rules.

[0169] In one embodiment, the repetition factor may be set to the maximum repetition factor value set in the SIB. In this case, in step S1104, the base station sets the number of repetitions to R = max(R SIB ) can be set.

[0170] Alternatively, the communication environment of uplink control channel transmission can be assumed to be a channel environment similar to that of Msg3 PUSCH transmission. In this case, in step S1105, the base station repeats Msg3 PUSCH R Msg3 The closest R SIB By finding the elements of (excluding 1), the number of repetitions can be determined as in the mathematical formula below.

[0171]

[0172] Here, the closest R SIB The elements of each r iIt can be calculated from the values ​​taken by taking the log. That is, the closest R is as shown in the mathematical formula below. SIB We can search for values ​​corresponding to the elements of . This is because the number of iterations is usually determined by the power of 2.

[0173]

[0174] Here, r with the same argmin value i If there are two or more, R can be set to the largest value among them to improve coverage. Alternatively, r with the same argmin value i If there are two or more, R can be set to the largest value among them to avoid wasting resources. Here, 1 can be excluded.

[0175] In another embodiment, to set the repetition factor, depending on the system environment, R Msg3 Select the minimum value among the values ​​not less than or equal to R Msg3 A criterion for selecting the maximum value among values ​​not greater than R can be applied. Here, both the base station and the terminal supporting repeated transmission of the uplink control channel are R SIB and status S1 and R of repeat request information Msg3 Therefore, if the terminal knows how to determine the repetition factor, the terminal that actually attempts PUCCH repeated transmission, such as Msg4 HARQ-ACK, can set the repetition factor to be the same as the repetition number R set by the base station and proceed with repeated transmission without having to specifically receive the repetition number through signaling.

[0176] FIG. 12 is a diagram illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0177] As illustrated in FIG. 12, in step S1201, the base station can receive repetition request information and determine whether the repetition request information transmitted by the terminal is in the S1 state. Here, the base station can separately determine whether the terminal supports uplink control channel repetition transmission. For example, performance information can be signaled separately from the existing 2-State repetition request information. That is, when the base station receives repetition request information in the S0 state from the terminal, the base station can distinguish between a terminal that does not support repetition transmission and a terminal that supports repetition transmission but does not request repetition transmission.

[0178] If the status of the repetition request information is S0, i.e., if the uplink control channel repetition transmission is not indicated, the terminal's RSRP measurement value is higher than the RSRP threshold or the terminal does not support uplink control channel repetition transmission. In step S1202, the base station can check whether the terminal supports uplink control channel repetition transmission.

[0179] If the terminal supports uplink control channel repeat transmission, in step S1203, the base station sets R = min(R SIB ), that is, the minimum value among the repetition factors set by the base station can be determined as the repetition factor of the terminal. However, the base station may not separately transmit the determined repetition factor information to the terminal through signaling such as DCI. Meanwhile, a terminal that supports uplink control channel repetition transmission may be R SIB And it is a situation where the terminal knows the status of its own repetition request information. Therefore, even if the terminal does not receive repetition factor information through signaling such as Msg4 HARQ-ACK, the repetition factor R = min(R) set by the base station SIB ) and perform repeated transmission of uplink control channel signals.

[0180] On the other hand, if it is not possible to confirm whether the terminal supports repeated transmission of the uplink control channel or if the terminal does not support repeated transmission of the uplink control channel, in step S1204, the base station may confirm whether the terminal does not support repeated transmission of the uplink control channel and may not perform repeated transmission. That is, the base station may determine R=1 as the repetition factor of the terminal. However, the base station does not separately transmit the determined repetition factor information to the terminal through signaling such as DCI. Meanwhile, the terminal may transmit information indicating that it does not support repeated transmission of the uplink control channel or may not support the repeated transmission function of the uplink control channel. Therefore, the terminal may not perform repeated transmission of the uplink control channel in the same manner as if R=1, even if it does not receive repetition factor information through signaling before performing Msg4 HARQ-ACK and common PUCCH resource-based transmission.

[0181] Meanwhile, when the state of the repetition request information is S1, the base station and the terminal can take the same action as when the state of the repetition request information is S1 in FIG. 11 and the related description.

[0182] Here, the criterion for setting the repetition factor must be determined in advance. If the criterion used is not determined in advance, information about the criterion used needs to be transmitted through separate signaling. For example, the criterion for setting the repetition factor may be the maximum coverage improvement criterion (R = max(R SIB )) or Msg3 PUSCH repetition factor based criteria (e.g., or ) can be determined in advance. According to another embodiment, when Msg3 PUSCH is repeatedly transmitted, the repetition factor of the uplink control channel can be determined using a Msg3 PUSCH repetition factor-based criterion. On the other hand, when Msg3 PUSCH is not repeatedly transmitted, the repetition factor of the uplink control channel can be determined using a maximum coverage enhancement criterion. When the criterion and setting method for setting the repetition factor are determined, the base station and the terminal can recognize the use of the criterion without separately signaling information about the criterion. Basically, the purpose of the method according to the present disclosure is to reduce signaling overhead, and therefore, it is preferable to determine the criterion in advance through a standard specification, if possible.

[0183] Meanwhile, to more dynamically transmit repetition factor information, when dynamically selecting the repetition factor setting criteria, the base station can inform the terminal of the information regarding the used setting criteria through signaling. Alternatively, the terminal can request information regarding the used setting criteria from the base station. However, preferably, the repetition factor setting criteria can be determined by the base station or the network.

[0184] When the base station informs all terminals in the cell of terminal-specific information about the reference, the base station can transmit the information about the reference through SIB1, SIB19, etc. When the base station informs terminals of terminal-specific information about the reference, the base station can transmit the information about the reference through the DAI field of DCI format 1_0 with CRC scrambled by TC-RNTI of Msg4, which is not used in Proposal 1.

[0185] On the other hand, when a terminal requests information about a reference from a base station, the terminal can request information about the reference through a separate PRACH occasion in Msg1, a separate PRACH preamble in case of shared PRACH occasions, or Msg3. When a terminal requests information about a reference from a base station, instead of accepting it as is, the base station can determine a reference by considering the terminal's request through Msg4, etc., and transmit information about the determined reference.

[0186] According to one embodiment of the present disclosure, the 2-bit Msg4 DCI DAI field defined in Rel-18 can be reserved to reduce signaling overhead. Therefore, if signaling of up to 2 bits via Msg4 DCI is required for other functions in the future, the DAI field can be utilized. Alternatively, candidates for repeat transmission factors that can be supported in the future, i.e., R total The embodiment of the present disclosure can be utilized even when the elements of Rel-18 are added compared to {1, 2, 4, 8} and transmission is not possible with only the DAI field.

[0187] FIGS. 13 to 18 are diagrams illustrating a method for determining the number of repetitions without using signaling for the repetition factor according to the present disclosure.

[0188] Referring to FIG. 13, candidates for repeated arguments can be set in SIB.

[0189] According to Case 1 of Figure 13, the candidates for the repeated arguments in SIB can be set to {1, 2, 4, 8}.

[0190] In step S1311, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0191] At step S1312, the terminal determines that it does not support repeated transmission of the uplink control channel, and may transmit Msg3 including repetition request information of the S0 state to the base station.

[0192] As a result, the base station and the terminal can set the repetition factor of the uplink control channel to 1 without separate signaling. Accordingly, the base station and the terminal may not perform a repeated transmission operation of the uplink control channel.

[0193] According to case 2 of Fig. 13, the candidates for the repeated arguments in SIB can be set to {1, 2, 4}.

[0194] In step S1311, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0195] At step S1312, the terminal determines that it does not support repeated transmission of the uplink control channel, and may transmit Msg3 including repetition request information of the S0 state to the base station.

[0196] As a result, the base station and the terminal can set the repetition factor of the uplink control channel to 1 without separate signaling. Accordingly, the base station and the terminal may not perform a repeated transmission operation of the uplink control channel.

[0197] Referring to FIG. 14, repetition factor candidates can be set in the SIB. Here, the repetition factor of the uplink control channel can be set to the largest value among the repetition factor candidates set in the SIB to improve coverage.

[0198] According to Case 1 of Figure 14, the candidates for the repeated arguments in SIB can be set to {1, 2, 4, 8}.

[0199] In step S1411, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0200] At step S1412, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0201] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 8, which is the maximum value among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform repeated transmission operations of the uplink control channel using the set repetition factor.

[0202] According to case 2 of Fig. 14, the candidates for the repeated arguments in SIB can be set to {1, 2, 4}.

[0203] In step S1411, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0204] At step S1412, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0205] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 4, which is the maximum value among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform repeated transmission operations of the uplink control channel using the set repetition factor.

[0206] Referring to FIG. 15, repetition factor candidates can be set in the SIB. Here, the repetition factor of the uplink control channel can be set based on the repetition factor of the Msg3 PUSCH transmission.

[0207] According to Case 1 of Figure 15, the candidates for the repeated arguments in SIB can be set to {1, 2, 8}.

[0208] In step S1511, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0209] At step S1512, the terminal determines that it supports repeated transmission of the uplink control channel and may transmit Msg3 containing repetition request information for the S1 state to the base station. Here, Msg3 may be repeatedly transmitted four times. That is, the repetition factor of the Msg3 PUSCH transmission may be 4.

[0210] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 2, which is the value that is linearly closest to the repetition factor of the Msg3 PUSCH transmission among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform a repeated transmission operation of the uplink control channel using the set repetition factor.

[0211] According to Case 2 of Figure 15, the candidates for the repeated arguments in SIB can be set to {2, 32}.

[0212] In step S1521, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0213] At step S1522, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0214] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 32, which has the logarithmic value closest to the repetition factor of the Msg3 PUSCH transmission among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform a repeated transmission operation of the uplink control channel using the set repetition factor.

[0215] According to case 3 of Fig. 15, the candidates for the repeated arguments in SIB can be set to {2, 4, 16, 32}.

[0216] In step S1531, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0217] At step S1532, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0218] As a result, the base station and the terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 8, which is the minimum value among the repetition factors set in the SIB that are greater than the repetition factor of the Msg3 PUSCH transmission. Accordingly, the base station and the terminal can perform a repeated transmission operation of the uplink control channel using the set repetition factor.

[0219] Referring to Figure 16, candidates for repeated arguments can be set in SIB.

[0220] According to Case 1 of Figure 16, the candidates for the repeated arguments in SIB can be set to {1, 2, 4, 8}.

[0221] In step S1611, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0222] At step S1612, the terminal determines that it supports repeated transmission of the uplink control channel but does not request repeated transmission of the uplink control channel, and can transmit Msg3 including repetition request information of the S0 state to the base station.

[0223] As a result, the base station and the terminal can set the repetition factor of the uplink control channel to 1 without separate signaling. Accordingly, the base station and the terminal may not perform a repeated transmission operation of the uplink control channel.

[0224] According to case 2 of Fig. 16, the candidates for the repeated arguments in SIB can be set to {2, 4, 8}.

[0225] In step S1621, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0226] At step S1622, the terminal determines that it does not support repeated transmission of the uplink control channel, and can transmit Msg3 including repetition request information of the S0 state to the base station.

[0227] As a result, the base station and the terminal can set the repetition factor of the uplink control channel to 1 without separate signaling. Accordingly, the base station and the terminal may not perform a repeated transmission operation of the uplink control channel.

[0228] According to case 3 of Fig. 16, the candidates for the repeated arguments in SIB can be set to {4, 8}.

[0229] In step S1631, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0230] At step S1632, the terminal determines that it does not request repeated transmission of the uplink control channel and may transmit Msg3 containing repetition request information for the S0 state to the base station. However, the base station may not be able to confirm whether the terminal supports repeated transmission of the uplink control channel.

[0231] As a result, the base station and the terminal can set the repetition factor of the uplink control channel to 1 without separate signaling. Accordingly, the base station and the terminal may not perform a repeated transmission operation of the uplink control channel.

[0232] Referring to FIG. 17, repetition factor candidates can be set in the SIB. Here, the repetition factor of the uplink control channel can be set to the largest value among the repetition factor candidates set in the SIB to improve coverage.

[0233] According to Case 1 of Figure 17, the candidates for the repeated arguments in SIB can be set to {2, 4, 8}.

[0234] In step S1711, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0235] At step S1712, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0236] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 8, which is the maximum value among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform repeated transmission operations of the uplink control channel using the set repetition factor.

[0237] According to case 2 of Fig. 17, the candidates for the repeated arguments in SIB can be set to {1, 4}.

[0238] In step S1721, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0239] At step S1722, the terminal determines that it supports repeated transmission of the uplink control channel and can transmit Msg3 including repetition request information of the S1 state to the base station.

[0240] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 4, which is the maximum value among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform repeated transmission operations of the uplink control channel using the set repetition factor.

[0241] Referring to FIG. 18, repetition factor candidates can be set in the SIB. Here, the repetition factor of the uplink control channel can be set based on the repetition factor of the Msg3 PUSCH transmission.

[0242] According to Case 1 of Figure 18, the candidates for the repeated arguments in SIB can be set to {2, 4, 8}.

[0243] In step S1511, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0244] At step S1512, the terminal determines that it supports repeated transmission of the uplink control channel and may transmit Msg3 containing repetition request information for the S1 state to the base station. Here, Msg3 may be repeatedly transmitted four times. That is, the repetition factor of the Msg3 PUSCH transmission may be 4.

[0245] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 4, which is the value that is linearly closest to the repetition factor of Msg3 PUSCH transmission among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform repeated transmission operation of the uplink control channel using the set repetition factor.

[0246] According to case 2 of Fig. 18, the candidates for the repeated arguments in SIB can be set to {2, 16}.

[0247] In step S1821, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0248] At step S1822, the terminal determines that it supports repeated transmission of the uplink control channel and may transmit Msg3 containing repetition request information for the S1 state to the base station. Here, Msg3 may be repeatedly transmitted four times. That is, the repetition factor of the Msg3 PUSCH transmission may be 4.

[0249] As a result, the base station and terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 2, which has the logarithm value closest to the repetition factor of the Msg3 PUSCH transmission among the repetition factors set in the SIB. Accordingly, the base station and terminal can perform a repeated transmission operation of the uplink control channel using the set repetition factor.

[0250] According to case 3 of Fig. 18, the candidates for the repeated arguments in SIB can be set to {2, 8, 16}.

[0251] In step S1831, the base station may transmit SIB configuration information to the terminal. The SIB configuration information may include information regarding repetition factor candidates.

[0252] At step S1832, the terminal determines that it supports repeated transmission of the uplink control channel and may transmit Msg3 containing repetition request information for the S1 state to the base station. Here, Msg3 may be repeatedly transmitted four times. That is, the repetition factor of the Msg3 PUSCH transmission may be 4.

[0253] As a result, the base station and the terminal can set the repetition factor of the uplink control channel without separate signaling. Here, the repetition factor can be set to 8, which is the minimum value among the repetition factors set in the SIB that are greater than the repetition factor of the Msg3 PUSCH transmission. Accordingly, the base station and the terminal can perform a repeated transmission operation of the uplink control channel using the set repetition factor.

[0254] According to another embodiment of the present disclosure, the base station may determine specific repetition counts among the total possible repetition counts as candidates for available repetition counts, considering the status of the repetition request information of the terminal, and perform bit allocation and signaling to convey information regarding the candidate groups of available repetition counts. The method and procedure for determining the repetition count accordingly may be as described below.

[0255] FIG. 19 is a diagram illustrating a method for determining and signaling a repetition factor according to the present disclosure.

[0256] Referring to Figure 19, the method for determining the number of repetitions can be composed of a total of four steps.

[0257] At step S1910, the base station can check the initial conditions to determine whether the repetition factor of the uplink control channel transmission can be determined without performing subsequent steps.

[0258] At step S1920, the base station can select repetition factor candidates to be included in the signaling process.

[0259] At step S1930, the base station can select a code point allocation priority for the selected repetition factor candidates.

[0260] At step S1940, the base station can assign the selected repetition factor candidates to the codepoints according to the priority.

[0261] Here, step S1910 may be a mandatory step. If further steps are required based on the determination made at step S1910, step S1940 may also be mandatory. Steps S1920 and S1930 are optional and may be omitted in some cases.

[0262] Before the explanation, the related mathematical notations are defined as follows: R * SIB is R SIB A subset of (R * SIB ⊂ R SIB ) may be a set having as elements the number of repetitions selected to be transmitted to each terminal through signaling, taking into account the status of the repetition request, etc. R * SIB The size of the set (i.e., the number of elements) can be K. Additionally, B can indicate the number of bits in the message field for signaling repetition factor information. The field can have a total of 2 B The information of the dog can be displayed. Therefore, the number of candidates selected K (= |R * SIB |) is 2 B It should be below.

[0263] Each step of the method for determining the number of repetitions according to one embodiment of the present disclosure may be as described below.

[0264] FIG. 20 is a diagram illustrating a method for checking initial conditions for determining a repetition factor according to the present disclosure.

[0265] Referring to Fig. 20, the step of checking the initial conditions for determining the repetition factor can be divided into two cases, depending on whether the information indicating whether the terminal supports Msg4 HARQ-ACK and common PUCCH resource repeated transmission is reported to the base station in a separate form from the repetition request information or can be confirmed. Here, the base station and the terminal check the status of the required repetition request information, R SIB or the status of the repeat request information, R SIB , and information such as whether repeated transmission is supported can be checked. Meanwhile, terminals that do not support repeated transmission of the uplink control channel may not be able to determine information related to repetition requests. Therefore, the terminal can transmit the uplink control channel non-repeatedly by default. In this case, the base station performs non-repeated transmission (e.g., R=1). Therefore, information related to repetition requests can be determined without any problems.

[0266] First, according to Case 1 of FIG. 20, the base station may not be able to separately determine whether the terminal supports repeated transmission. In this case, separate performance information distinct from the 2-State repetition request information may not be signaled. That is, as agreed upon in Rel-18, the information on whether repeated transmission is supported is not distinct from the repetition request information in signaling. Therefore, the base station that receives repetition request information in S0 state from the terminal cannot distinguish whether the terminal does not support repeated transmission or whether the terminal supports repeated transmission but does not request repeated transmission.

[0267] First, in step S2011, the base station can determine whether the status of the repetition request information is S0 or S1. If it is S1, the base station can perform the operations of the subsequent steps of Fig. 19 according to step S2014. If the status of the repetition request information is S0, in step S2012, the base station determines whether the R set in the SIB SIB It can be determined whether 1 is included in R. That is, the base station can determine whether the terminal actually supports non-repetitive transmission. If 1∈R SIB In this case, according to step S2014, the base station can perform the operations of the subsequent steps of FIG. 19. This means that when the state of the repetition request information is S0, the terminal supporting repeated transmission can set the repetition factor to R=1 and transmit the uplink control channel. Since the terminal not supporting repeated transmission does not support repeated transmission, it can transmit the uplink control channel in the same way as setting the repetition factor to R=1. Therefore, in both cases, the base station can prevent unnecessary waste of PUCCH resources by determining the repetition factor to R=1.

[0268] Meanwhile, if 1 R SIB In this case, the base station cannot set the repetition factor to 1. In this case, the base station sets the repetition factor to a value greater than 1, which may waste PUCCH resources. Therefore, in step S2013, the base station can stop the repeated transmission operation of the uplink control channel. In practice, both the base station and the terminal can transmit the uplink control channel in the same way as when R=1 is set.

[0269] On the other hand, according to Case 2 of Figure 20, the base station can separately determine whether the terminal supports repeated transmission. In this case, the information on whether the terminal supports repeated transmission can be signaled separately from the existing 2-State repetition request signaling. In other words, the base station that receives S0 from the terminal can distinguish whether the terminal does not support repeated transmission or whether the terminal supports repeated transmission but does not request repeated transmission.

[0270] In step S2021, the base station can determine whether the status of the repetition request information is S0 or S1. If the repetition request information is S1, the base station can perform the operations of the subsequent steps of FIG. 19 according to step S2025. If the status of the repetition request information is S0, in step S2022, the base station determines whether the R set in the SIB SIB We can determine whether 1 is included in R, i.e. whether it supports practical non-repeated transmission. If 1∈R SIB In this case, the base station can perform the operations of the subsequent steps of Fig. 19. On the other hand, 1 R SIB In this case, in step S2023, the base station can additionally determine whether the terminal supports repeated transmission. If the terminal supports repeated transmission, the terminal can support repeated transmission of the uplink control channel according to a repetition factor of R>1 regardless of the status of the repetition request information. Therefore, in step S2025, the base station can perform the operations of the subsequent steps of FIG. 19. On the other hand, if the terminal does not support repeated transmission or the base station cannot know whether the terminal supports repeated transmission (for example, if the terminal is a legacy terminal that does not support signaling related to whether the terminal supports repeated transmission), the base station that sets the repetition factor to a value greater than 1 may waste PUCCH resources. Therefore, in step S2024, the base station can stop the operation of the repeated transmission procedure.

[0271] A terminal that does not support repetitive transmission is essentially the same as a terminal that sets the repetition factor to R=1, as it does not support repetitive transmission. Therefore, the base station and the terminal that does not support repetitive transmission can perform PUCCH transmission in the same way as when the repetition factor is set to R=1.

[0272] Referring again to FIG. 19, at step S1920, the base station determines the status of the repetition request information and R Msg3 (Msg3 PUSCH repetition count) etc. SIB Among the repeating factors included in R, the repeating factors that can be transmitted through actual signaling * SIB can determine the status of the repeat request information for both the base station and the terminal and R SIB and R Msg3 This may be a situation where the base station and the terminal are aware of the conditions for determining the repetition factors transmitted through actual signaling. Therefore, if the selection conditions for determining the repetition factors transmitted through actual signaling are determined in advance, the base station and the terminal can perform each process separately to obtain the same result.

[0273] According to one embodiment of the present disclosure, the base station and the terminal utilize the status of the repetition request information to R * SIB can be decided.

[0274] If the status of the repeat request information indicates S0, i.e., no request for repeat transmission, the terminal is a terminal that does not support repeat transmission or does not request repeat transmission. In this case, both the base station and the terminal are R SIB K repetition factors starting from the smallest value among the elements belonging to R * SIB can be determined as an element of .

[0275] On the other hand, if the repeat request status is S1, i.e., indicating a request for repeated transmission, the terminal supports repeated transmission and is the terminal that transmitted the information requesting repeated transmission. In this case, both the base station and the terminal are RSIB K repeating factors starting from the largest value among the elements belonging to R * SIB can be determined as an element of .

[0276] According to another embodiment of the present disclosure, the base station and the terminal utilize the status of the repetition request information and the number of Msg3 PUSCH repetitions to * SIB can be decided.

[0277] If the status of the repeat request information indicates S0, i.e., no request for repeat transmission, the terminal does not support repeat transmission or does not request repeat transmission. In this case, both the base station and the terminal are in R SIB K repetition factors starting from the smallest value among the elements belonging to R * SIB can be determined as an element of R. That is, if the state of the repetition request information is S0, R * SIB is R Msg3 can be decided regardless.

[0278] On the other hand, if the status of the repetition request information is S1, i.e., indicating a request for repeated transmission, the terminal supports repeated transmission and may be the terminal that transmitted the information requesting repeated transmission. In this case, both the base station and the terminal are R SIB Among the elements belonging to R Msg3 K of the repeating factors close to R Msg3 R in order of proximity * SIB can be determined as an element of . Here, the criterion for calculating the nearest repetition factor can be a criterion based on the difference in values ​​when log2 is taken for each repetition factor. That is, |log2R Msg3 - log2r i | for 1≤i≤|R SIB | is the smallest K r i (∈R SIB ) in order of smallest R *SIB can be set as an element of r. However, i = 1 can always have the lowest priority over all other values. Same |log2R Msg3 - log2r i If there are two repeating factors with | , the larger repeating factor is given priority. * SIB can be determined as an element of .

[0279] According to one embodiment of the present disclosure, when there are different repetition factor candidates having the same difference value, a larger repetition factor is preferentially selected. * SIB can be determined as an element of R. This may be a way to maximize coverage enhancement. According to another embodiment of the present disclosure, in order to minimize transmission resource waste, when the same difference occurs, a smaller repetition factor (except 1) is given priority. * SIB can be determined as an element of R. If there are repeating factors with the same difference, R * SIB The criteria for determining the elements of R must be predetermined through specifications. In addition, R * SIB The criterion for determining the elements of |R is the difference of the log2-based repetition factor instead of |R Msg3 - r i | for 1≤i≤|R SIB |, which can be based on the linear difference values ​​of the repeated factors.

[0280] R based on repeat factor candidates * SIBThe method of determining the element may be a signaling or predetermined method, a method of using the number of Msg3 PUSCH repetition transmissions when Msg3 PUSCH repetition transmissions were supported, and a method of using the status of repetition request information when Msg3 PUSCH repetition transmissions were not supported.

[0281] R * SIB can be set as shown in the table below.

[0282]

[0283] As expressed in the table, K = |R SIB |Ramen R * SIB = R SIB It may be. In this case, step S1920 may be omitted.

[0284] Referring again to Figure 19, R * SIB The base station and terminal that have set R * SIB The allocation priority of each element (repeated factor) belonging to can be determined. Here, the allocation priority can mean the priority in the code point allocation process. To determine the allocation priority, R * SIB Criteria for setting, R * SIB , R SIB , R Msg3 , repeat request information, etc. may be used. The above information may be information that the base station and terminal know in advance. Therefore, if the criteria for determining allocation priorities are consistent between the base station and the terminal, the base station and the terminal can derive the same result value.

[0285] The assignment priority of repeating arguments can be set according to the criteria below.

[0286]

[0287] According to one embodiment of the present disclosure, R * SIB The priority of the elements of R is SIB It can be determined according to the priority assigned in .

[0288] According to one embodiment of the present disclosure, R * SIB The priority of elements of R * SIB It can be decided in the order in which it is first assigned.

[0289] According to one embodiment of the present disclosure, R * SIB The priority of elements of R * SIB It can be determined that the smaller the value among the elements, the higher the allocation priority.

[0290] According to one embodiment of the present disclosure, R * SIB The priority of elements of R * SIB It can be determined that among the elements, the larger the value, the higher the allocation priority.

[0291] According to one embodiment of the present disclosure, if the state of the repetition request information is S0, R * SIB The priority of elements of R * SIB Among the elements, the smaller the value, the higher the allocation priority can be determined. On the other hand, if the state of the repetition request information is S1, R * SIB The priority of elements of R * SIB It can be determined that among the elements, the larger the value (repetition factor) is, the higher the assignment priority.

[0292] If code points are not allocated according to priority, the step of determining allocation priority may be omitted.

[0293] Referring again to Figure 19, the base station and terminal are R * SIB Bits can be assigned to each element of . If the criteria used in the bit allocation process are agreed upon in advance between the terminal and the base station, the base station and the terminal can each assign R * SIB And since the priorities of each element are known, the same bit allocation rule can be used. Here, the allocated bits can be allocated in the order of LSB → MSB (Most Significant Bit) of the field to be used in the signaling process or in the order of MSB → LSB.

[0294] R * SIB The way bits are assigned to each element can be as described below.

[0295] According to one embodiment of the present disclosure, R * SIB The way to allocate bits to each element of always uses B bits, and this can be a fixed mapping method in which allocation increases by 1 from the code point of the all-zero bit sequence. For example, when B=3, the repetition factor represented by each B-bit sequence can be allocated in the order of 000, 001, 010, 011, ... If K<2 B If not all code points are assigned to the repetition argument, the unassigned code points are not used. In this case, the assignment order can be based on priority / reverse priority / small repetition count / large repetition count, etc.

[0296]

[0297] According to one embodiment of the present disclosure, R * SIBThe way to allocate bits to each element of can be a reservation-based mapping, which determines how many bits of the B bits of the field to use depending on K. 1≤K≤2 1 When 1 bit, 3≤K≤2 2 2 bits when 5≤K≤2 3 When it's 3 bits, it's 2 like this B*-1 +1≤K≤2 B* In case of B bits in the field used for signaling, B * (≤B) bits are used, and unused (BB * ) bits are reserved and can be used for other purposes when needed. B * Allocate bits starting from the All-zero bit sequence, incrementing by 1 for each bit. If K<2 B* All B with * If bit code points are not assigned to repeat arguments, the unassigned code points are not used. In this case, the allocation order can be based on priority / reverse priority / smallest repetition count / largest repetition count, etc.

[0298]

[0299] According to one embodiment of the present disclosure, R * SIBThe way bits are allocated to each element of can be an adaptive reservation based mapping, which determines which bits of the B bits of the field to use based on the priority of the repetition factor. For example, assuming the case of B=2, we can consider the case where the repetition count of the first rank is assigned to 0, the repetition factor of the second rank to 10, and the repetition factor of the third rank to 11. These values ​​can be used by inverting the priority bits, such as 1, 00, and 01. Also, assuming the case of B=3, we can consider the case where the repetition count of the first rank is assigned to 0, the repetition factor of the second rank to 100, the repetition factor of the third rank to 101, the repetition factor of the fourth rank to 111, and the repetition factor of the fifth rank to 111. That is, the repetition factor that is assigned with the highest probability and has the highest priority is expressed with only one bit corresponding to the MSB or LSB among the B bits in the field, and the remaining B-1 bits are reserved so that they cannot be assigned to repetition factors. Repetition factors with other priorities have bits inverted compared to the repetition factor with the first priority, and are allocated according to the priority with the remaining (B-1) bits. Therefore, when the repetition factor with the highest priority is set, additional saving of signaling overhead is possible. In addition, the adaptive allocation method can be used to represent a total of 2 in the field of B bits. B-1 It can express up to +1 cases. Therefore, when applying the adaptive allocation method, K≤2 B-1 +1 must be satisfied. If K<2 B-1When +1, if there are code points that are not assigned to repeat arguments, the unassigned B-bit code points are not used. Adaptive allocation can be advantageous when it is agreed that the repeat argument with the highest priority has the highest probability of occurrence, based on a state-based method of repeat request information. Adaptive allocation can be difficult to apply when there is no priority among the repeat arguments to be sent, or when the priority among the repeat arguments is not known.

[0300]

[0301] The base station and the terminal may signal a repetition factor by performing at least some or all of the procedures described above.

[0302] Here, B, the number of bits for transmitting the repetition factor, must be determined in advance. Furthermore, the usage criteria and K at each stage may be determined in advance or through separate signaling. Since the method disclosed herein is fundamentally aimed at reducing signaling overhead, it is preferable to determine the criteria and K in advance through such standard specifications, if possible.

[0303] Meanwhile, when determining K and the criteria to be used in each step through signaling in order to more dynamically transmit the repetition factor, the base station can transmit the relevant information to the terminal. The terminal can request or transmit the relevant information to the base station, but it is preferred that the determination of these criteria and parameters be performed in the base station or the network. When the base station informs all terminals in the cell of K and the criteria to be used in each step in a terminal-specific manner, the base station can transmit information about K and the criteria to be used in each step through SIB1, SIB19, etc. When the base station informs the terminal in a terminal-specific manner, the base station can transmit information about K and the criteria to be used in each step through the DAI field of DCI format 1_0 with CRC (cyclic redundancy check) scrambled by TC-RNTI in Msg4. Meanwhile, when the terminal requests information about K and the criteria to be used in each step from the base station, the base station can request information about K and the criteria to be used in each step through a separate PRACH occasion in Msg1, a separate PRACH preamble in case of shared PRACH occasions, or through Msg3. When applying this terminal request method, instead of accepting it as is, the base station can inform the terminal of the criteria it has decided on by considering the terminal's request through Msg4, etc.

[0304] FIGS. 21 to 24 are diagrams illustrating operations for determining and signaling a repetition factor according to the present disclosure.

[0305] Referring to Case 1 of Figure 21, at step S2111, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4, 8}.

[0306] In step S2112, the base station may select candidates for repetition factors to be included in the signaling process. Here, the candidates for repetition factors may be selected based on the status value of the repetition request information. Here, the number of repetition factors transmitted, K, may be 3, and the status of the repetition request information may be S0. Therefore, R SIB Among the repeating factors of R, K repeating factor candidates with small values ​​are selected. * SIB can be set to {1, 2, 4}.

[0307] In step S2113, the base station can set the priorities of the selected repetition factor candidates during the codepoint allocation process. Here, the priorities of the repetition factor candidates can be set based on the status value of the repetition request information. Accordingly, the priorities of the repetition factor candidates can be determined in the order of 1, 2, and 4, with the highest priority being 1.

[0308] In step S2114, the base station can assign the selected repetition factor candidates to codepoints. Here, the repetition factor candidates can be mapped to codepoints according to an adaptive preservation allocation scheme. Furthermore, the number of bits used to signal the repetition factor candidates can be two. Accordingly, codepoint 0 can be assigned to repetition factor 1, codepoint 10 to repetition factor 2, and codepoint 11 to repetition factor 4.

[0309] Referring to Case 2 of Figure 21, in step S2121, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4, 8, 16, 32}. And, R Msg3 can be 8 days.

[0310] In step S2122, the base station may select candidates for repetition factors to be included in the signaling process. Here, the candidates for repetition factors may be selected based on the status value of the repetition request information and the value of Msg3. Here, the number of repetition factors transmitted, K, may be 4, and the status of the repetition request information may be S1. Therefore, R SIB Among the repeating factors of R, Msg3 K candidates for repeating factors with values ​​close to R are selected. * SIB can be set to {4, 8, 16, 32}.

[0311] In step S2123, the base station can set the priority of the selected repetition factor candidates in the code point allocation process. Here, the priority of the repetition factor candidates is R * SIB The priority of the repeating factor candidates can be determined based on the priority of the selection. Therefore, the priority of the repeating factor candidates can be determined to have a high priority in the order of 8, 16, 4, and 32.

[0312] In step S2114, the base station may assign the selected repetition factor candidates to codepoints. Here, the repetition factor candidates may be mapped to codepoints according to an adaptive preservation allocation method. Furthermore, the number of bits used to signal the repetition factor candidates may be three. Accordingly, codepoint 00 may be assigned to repetition factor 8, codepoint 10 to repetition factor 16, codepoint 10 to repetition factor 4, and codepoint 11 to repetition factor 32. Furthermore, the last codepoint may not be used.

[0313] Referring to Case 1 of Figure 22, at step S2211, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4, 8}.

[0314] In step S2212, the base station may select candidates for repetition factors to be included in the signaling process. Here, the candidates for repetition factors may be selected based on the status value of the repetition request information. Here, the number of repetition factors transmitted, K, may be 2, and the status of the repetition request information may be S1. Therefore, R SIB Among the repeating factors of R, K repeating factor candidates with large values ​​are selected. * SIB can be set to {4, 8}.

[0315] Here, the step of setting the priority of the selected repetition argument candidates in the code point allocation process can be omitted.

[0316] In step S2213, the base station can assign the selected repetition factor candidates to codepoints. Here, the repetition factor candidates can be mapped to codepoints according to a preservation assignment method. Furthermore, the number of bits used to signal the repetition factor candidates can be 1. Accordingly, codepoint 0 can be assigned to repetition factor 4, and codepoint 1 can be assigned to repetition factor 8.

[0317] Referring to Case 2 of Figure 22, in step S2221, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4, 8, 16, 32}. And, R Msg3 can be 8 days.

[0318] In step S2222, the base station may select candidates for repetition factors to be included in the signaling process. Here, the candidates for repetition factors may be selected based on the status value of the repetition request information and the value of Msg3. Here, the number of repetition factors transmitted, K, may be 4, and the status of the repetition request information may be S0. Therefore, R SIBAmong the repetition factors of R, K repetition factor candidates with the smallest values ​​are selected. * SIB can be set to {1, 2, 4, 8}.

[0319] Here, the step of setting the priority of the selected repetition argument candidates in the code point allocation process can be omitted.

[0320] In step S2223, the base station may assign the selected repetition factor candidates to code points. Here, the repetition factor candidates may be mapped to code points according to an adaptive preservation allocation method. In addition, the number of bits used to signal the repetition factor candidates may be 3. Accordingly, code point 000 may be assigned to repetition factor 1, code point 001 to repetition factor 2, code point 010 to repetition factor 4, and code point 011 to repetition factor 8. In addition, code points 100, 101, 110, and 111 may not be used.

[0321] Referring to case 1 of Fig. 23, the state of the repetition request information may be S1.

[0322] In step S2311, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {2, 4, 8}.

[0323] Here, the number of repeated arguments passed, K, can be 3. That is, R SIB Wow R * SIB may be identical to each other. Therefore, the step of selecting candidates for repeated arguments to be included in the signaling process may be omitted.

[0324] In step S2312, the base station can set the priorities of the selected repetition factor candidates during the codepoint allocation process. Here, the priorities of the repetition factor candidates can be set based on the status value of the repetition request information. Accordingly, the priorities of the repetition factor candidates can be determined in the order of 8, 4, and 2, with 8 being the highest priority.

[0325] In step S2313, the base station can assign the selected repetition factor candidates to codepoints. Here, the repetition factor candidates can be mapped to codepoints according to an adaptive preservation allocation scheme. Furthermore, the number of bits used to signal the repetition factor candidates can be two. Accordingly, codepoint 0 can be assigned to repetition factor 1, codepoint 10 to repetition factor 2, and codepoint 11 to repetition factor 4.

[0326] Referring to Case 2 of Figure 23, in step S2321, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 4, 8, 16}.

[0327] Here, the number of repeated arguments passed, K, can be 4. That is, R SIB Wow R * SIB may be identical to each other. Therefore, the step of selecting candidates for repeated arguments to be included in the signaling process may be omitted.

[0328] In step S2322, the base station can set the priorities of the selected repetition factor candidates during the codepoint allocation process. Here, the priorities of the repetition factor candidates can be set based on the status value of the repetition request information. Accordingly, the priorities of the repetition factor candidates can be determined in the order of 1, 4, 8, and 16, with the highest priority being 1.

[0329] In step S2323, the base station may assign the selected repetition factor candidates to codepoints. Here, the repetition factor candidates may be mapped to codepoints according to an adaptive preservation allocation method. Furthermore, the number of bits used to signal the repetition factor candidates may be three. Accordingly, codepoint 00 may be assigned to repetition factor 1, codepoint 10 to repetition factor 4, codepoint 10 to repetition factor 8, and codepoint 11 to repetition factor 16. Furthermore, the last codepoint may not be used.

[0330] Referring to Case 1 of Figure 24, at step S2411, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4}.

[0331] Here, the number of repeated arguments passed, K, can be 3. That is, R SIB Wow R * SIB may be identical to each other. Therefore, the step of selecting candidates for repeated arguments to be included in the signaling process may be omitted.

[0332] Additionally, the step of setting the priority of selected repeat argument candidates in the code point allocation process may be omitted.

[0333] In step S2412, the base station may assign selected repetition factor candidates to code points. Here, the repetition factor candidates may be mapped to code points according to a fixed assignment method. Furthermore, the number of bits used to signal the repetition factor candidates may be two. Accordingly, code point 00 may be assigned to repetition factor 1, code point 01 to repetition factor 2, and code point 10 to repetition factor 4. Code point 11 may not be used.

[0334] Referring to Case 2 of Figure 24, at step S2421, the base station can check the initial conditions and perform subsequent iteration factor signaling operations. Here, R SIB can be {1, 2, 4, 8, 16, 32}.

[0335] Here, the number of repeated arguments passed, K, can be 6. That is, R SIB Wow R * SIB may be identical to each other. Therefore, the step of selecting candidates for repeated arguments to be included in the signaling process may be omitted.

[0336] Additionally, the step of setting the priority of selected repeat argument candidates in the code point allocation process may be omitted.

[0337] In step S2422, the base station can assign the selected repetition factor candidates to code points. Here, the repetition factor candidates can be mapped to code points according to a preservation assignment method. In addition, the number of bits used to signal the repetition factor candidates can be 4. Accordingly, code point 000 can be assigned to repetition factor 1, code point 001 to repetition factor 2, code point 010 to repetition factor 4, code point 011 to repetition factor 8, code point 100 to repetition factor 16, and code point 101 to repetition factor 32. In addition, code points 110, 111, and the last bit may not be used.

[0338] FIG. 25 illustrates an example of a procedure for a method of setting a repetition factor of an uplink control channel signal according to one embodiment of the present disclosure.

[0339] In step S2510, the base station may transmit to the terminal a message including information about candidates for a repetition factor indicating the number of repetition transmissions of the uplink control channel.

[0340] At step S2520, the base station can receive a message including response information for setting up repeated transmission of an uplink control channel from the terminal.

[0341] At step S2530, the base station can determine the repetition factor of the uplink control channel according to preset criteria for determining the repetition factor of the uplink control channel based on the response information.

[0342] At step S2540, the base station can receive an uplink control channel signal from the terminal as many times as the repetition factor of the determined uplink control channel.

[0343] Here, the response information may include information for requesting repeated transmission of the uplink control channel.

[0344] Here, the response information may include information indicating whether the terminal supports repeated transmission of the uplink control channel, which is information distinct from information for requesting repeated transmission of the uplink control channel.

[0345] Here, the repetition factor of the uplink control channel can be determined based on statistical values ​​of candidates for the repetition factor according to preset criteria.

[0346] Here, the repetition factor of the uplink control channel can be determined based on the number of times the response message is repeatedly transmitted, according to a preset criterion.

[0347] Here, the operating method may further include a step of signaling information indicating a repetition factor of an uplink control channel to the terminal.

[0348] Here, the step of signaling information indicating a repetition factor of an uplink control channel to a terminal may include a step of determining whether to signal information indicating a repetition factor of an uplink control channel based on candidates of repetition factors and response information, a step of mapping at least some of the candidates of repetition factors to code points based on whether to signal, and a step of signaling information indicating a repetition factor of the determined uplink control channel using the code points.

[0349] Here, the step of mapping at least some of the candidates of the repetition factor to the code point may be characterized by mapping a number of candidates of the repetition factor determined based on the number of bits of an information field indicating the repetition factor of the uplink control channel to the code point.

[0350] Here, the step of mapping at least some of the candidates for the repetition argument to code points may be characterized by mapping the candidates for the repetition argument to code points based on priorities of at least some of the candidates for the repetition argument.

[0351] The operations of the method according to the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0352] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0353] While some aspects of the present disclosure have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most significant method steps may be performed by such a device.

[0354] A programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described in the present disclosure. The field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in the present disclosure. In general, the methods are preferably performed by some hardware device.

[0355] Although the present disclosure has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

[0356] The present invention can be used in a device and a transmitter / receiver for transmitting and receiving signals.

Claims

1. In a method of operating a base station in a wireless communication system, A step of transmitting to a terminal a message including information about candidates for a repetition factor indicating the number of repetition transmissions of an uplink control channel; A step of receiving a message including response information for setting up repeated transmission of an uplink control channel from the terminal; A step of determining a repetition factor of an uplink control channel according to a preset criterion for determining a repetition factor of an uplink control channel based on the above response information; and A method comprising the step of receiving an uplink control channel signal from the terminal for a repetition factor of the determined uplink control channel.

2. In claim 1, The above response information is, A method, characterized in that it includes information for requesting repeated transmission of the above uplink control channel.

3. In claim 2, The above response information is, A method characterized in that it includes information indicating whether the terminal supports repeated transmission of the uplink control channel, which is information distinct from information for requesting repeated transmission of the uplink control channel.

4. In claim 1, The repetition factor of the above uplink control channel is: A method characterized in that the determination is made based on statistical values ​​of candidates for the repetition factor according to the above preset criteria.

5. In claim 1, The repetition factor of the above uplink control channel is: A method characterized in that the number of times the response message is repeatedly transmitted is determined based on the above preset criteria.

6. In claim 1, A method further comprising the step of signaling information indicating a repetition factor of the uplink control channel to the terminal.

7. In claim 6, The step of signaling information indicating a repetition factor of the above uplink control channel to the terminal is as follows: A step of determining whether to signal information indicating a repetition factor of the uplink control channel based on candidates of the repetition factor and the response information; A step of mapping at least some of the candidates of the repetition factor to code points based on whether the signaling is performed; and A method comprising the step of signaling information indicating a repetition factor of the determined uplink control channel using the above code point.

8. In claim 7, The step of mapping at least some of the candidates of the above repetition argument to code points is: A method characterized by mapping candidates of a number of repetition factors determined based on the number of bits of an information field indicating a repetition factor of the uplink control channel to code points.

9. In claim 7, The step of mapping at least some of the candidates of the above repetition argument to code points is: A method characterized in that the candidates of the repetition factor are mapped to code points based on priorities of at least some of the candidates of the repetition factor.

10. In a method of operating a terminal in a wireless communication system, A step of receiving a message including information about candidates for a repetition factor indicating a repetition factor of an uplink control channel from a base station; A step of transmitting a message including response information for setting up repeated transmission of an uplink control channel to the base station; and A step of determining a repetition factor of an uplink control channel according to a preset criterion for determining a repetition factor of an uplink control channel based on the above response information; and A method comprising the step of transmitting an uplink control channel signal from the terminal a repetition factor of the determined uplink control channel.

11. In claim 10, The above response information is, A method, characterized in that it includes information for requesting repeated transmission of the above uplink control channel.

12. In claim 11, The above response information is, A method characterized in that it includes information indicating whether the terminal supports repeated transmission of the uplink control channel, which is information distinct from information for requesting repeated transmission of the uplink control channel.

13. In claim 10, The repetition factor of the above uplink control channel is: A method characterized in that the determination is made based on statistical values ​​of candidates for the repetition factor according to the above preset criteria.

14. In claim 10, The repetition factor of the above uplink control channel is: A method characterized in that the number of times the response message is repeatedly transmitted is determined based on the above preset criteria.

15. In claim 10, A method further comprising the step of receiving information indicating a repetition factor of the uplink control channel from the base station.

16. In claim 15, Further comprising a step of mapping at least some of the candidates of the above repetition factor to code points, The repetition factor of the above uplink control channel is: A method characterized in that the method is set based on information indicating a repetition factor of the uplink control channel using the above code point.

17. In claim 16, The step of mapping at least some of the candidates of the above repetition argument to code points is: A method characterized by mapping candidates of a number of repetition factors determined based on the number of bits of an information field indicating a repetition factor of the uplink control channel to code points.

18. In claim 16, The step of mapping at least some of the candidates of the above repetition argument to code points is: A method characterized in that the candidates of the repetition factor are mapped to code points based on priorities of at least some of the candidates of the repetition factor.

19. In a base station operating in a wireless communication system, At least one transmitter; At least one receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: Transmitting to a terminal a message including information about candidates for a repetition factor indicating the number of repetition transmissions of an uplink control channel; Receive a message including response information for setting up repeated transmission of an uplink control channel from the terminal; Determine the repetition factor of the uplink control channel according to a preset criterion for determining the repetition factor of the uplink control channel based on the above response information; and A base station that receives an uplink control channel signal from the terminal for a repetition factor of the determined uplink control channel.

20. In a wireless communication system, at a terminal, At least one transmitter; At least one receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: Receive a message including information about candidates for repetition factors indicating a repetition factor of an uplink control channel from a base station; Transmitting to the base station a message including response information for setting up repeated transmission of an uplink control channel; Determine the repetition factor of the uplink control channel according to a preset criterion for determining the repetition factor of the uplink control channel based on the above response information; and A terminal that transmits an uplink control channel signal from the terminal for a repetition factor of the determined uplink control channel.

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