Method and device for applying orthogonal covering code to non-terrestrial network uplink channel in wireless communication system

Abstract

The present disclosure relates to a method and device for managing uplink synchronization for a non-terrestrial base station in a wireless communication system. An operation method performed by a terminal may comprise: receiving downlink control information (DCI) including an uplink (UL) grant; generating symbols including data on the basis of the DCI; applying an orthogonal covering code (OCC) to signals included in a plurality of slots including the symbols; and transmitting the signals, wherein the OCC is applied by using an OCC sequence assigned to the terminal, and the DCI includes at least one of information about the length of the OCC sequence or information indicating a value of the OCC sequence.

Description

Method and device for applying orthogonal covering codes to non-terrestrial network uplink channels in wireless communication systems

[0001] The present disclosure relates to a non-terrestrial network (NTN) in a wireless communication system, and more particularly, to a method and apparatus for applying an orthogonal covering code (OCC) to an uplink channel.

[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) and advanced LTE-A). 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 a variety of communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks may include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), and massive Machine Type Communication (mMTC).

[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] 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.).

[0005] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) can provide communication services to terminals located on the ground. Demand for communication services for not only terrestrial but also non-terrestrial devices such as aircraft, drones, and satellites is increasing, and technologies for non-terrestrial networks (NTNs) are being discussed to address this need. NTNs can be implemented based on 5G communication technologies, 6G communication technologies, etc. For example, in NTNs, communication between satellites and ground-based communication nodes or non-terrestrial communication nodes (e.g., aircraft, drones, etc.) can be performed based on 5G communication technologies, 6G communication technologies, etc. In NTNs, satellites can function as base stations in communication networks (e.g., 5G communication networks, 6G communication networks, etc.).

[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 method and device for applying an orthogonal covering code (OCC) to an uplink channel in a wireless communication system supporting a non-terrestrial network (NTN).

[0008] The present disclosure may provide a method and device for applying OCC during repeated transmission of a physical uplink shared channel (PUSCH) in a wireless communication system.

[0009] The present disclosure may provide a method and device for applying OCC based on a PUSCH repetition type in a wireless communication system.

[0010] The present disclosure may provide a method and device for transmitting information about an OCC in a wireless communication system.

[0011] The present disclosure may provide a method and device for transmitting information about an OCC using downlink control information (DCI) in a wireless communication system.

[0012] The present disclosure may provide a method and device for determining the length of an OCC sequence in a wireless communication system.

[0013] 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.

[0014] According to one embodiment of the present disclosure, a method of operating a terminal in a wireless communication system includes receiving downlink control information (DCI) including an uplink (UL) grant, generating symbols including data based on the DCI, applying an orthogonal covering code (OCC) to signals included in a plurality of slots including the symbols, and transmitting the signals, wherein the OCC is applied using an OCC sequence allocated to the terminal, and the DCI may include at least one of information on a length of the OCC sequence or information indicating a value of the OCC sequence.

[0015] According to one embodiment of the present disclosure, a method of operating a non-terrestrial network (NTN) base station in a wireless communication system includes transmitting downlink control information (DCI) including an uplink (UL) grant, and receiving signals transmitted in a plurality of slots, wherein the signals are included in a plurality of slots including symbols including data, to which an orthogonal covering code (OCC) is applied, and the OCC is applied using an OCC sequence allocated to a terminal, and the DCI may include at least one of information on a length of the OCC sequence and information indicating a value of the OCC sequence.

[0016] According to one embodiment of the present disclosure, in a wireless communication system, a terminal includes at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the terminal to perform operations, the operations including receiving downlink control information (DCI) including an uplink (UL) grant, generating symbols including data based on the DCI, applying an orthogonal covering code (OCC) to signals included in a plurality of slots including the symbols, and transmitting the signals, wherein the OCC is applied using an OCC sequence allocated to the terminal, and the DCI may include at least one of information regarding a length of the OCC sequence or information indicating a value of the OCC sequence.

[0017] According to one embodiment of the present disclosure, in a wireless communication system, a non-terrestrial network (NTN) base station includes at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the terminal to perform operations, the operations including transmitting downlink control information (DCI) including an uplink (UL) grant, and receiving signals transmitted in a plurality of slots, the signals being included in a plurality of slots including symbols including data, an orthogonal covering code (OCC) being applied, the OCC being applied using an OCC sequence allocated to the terminal, and the DCI including at least one of information regarding a length of the OCC sequence and information indicating a value of the OCC sequence.

[0018] The proposed technology enables improving uplink capacity by determining information about the OCC technique to be applied to repetitive transmissions in a wireless communication system supporting a non-terrestrial network (NTN) and efficiently signaling it.

[0019] 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.

[0020] FIG. 1a and FIG. 1b illustrate the structure of a transparent-based non-terrestrial network (NTN) according to an embodiment of the present disclosure.

[0021] FIGS. 2A to 2C illustrate the structure of a regenerative-based NTN according to an embodiment of the present disclosure.

[0022] FIG. 3 illustrates a block diagram of a communication node constituting an NTN according to an embodiment of the present disclosure.

[0023] FIG. 4 illustrates a block diagram of a communication node according to an embodiment of the present disclosure.

[0024] FIGS. 5A and 5B illustrate block diagrams of a transmission path and a reception path of a communication node according to an embodiment of the present disclosure.

[0025] FIG. 6 illustrates an example of a system frame in a wireless communication system according to an embodiment of the present disclosure.

[0026] FIG. 7 illustrates an example of a subframe in a wireless communication system according to an embodiment of the present disclosure.

[0027] FIG. 8 illustrates an example of a slot in a wireless communication system according to an embodiment of the present disclosure.

[0028] FIG. 9 illustrates the timing relationship between uplink and downlink in a wireless communication system according to an embodiment of the present disclosure.

[0029] FIG. 10A and FIG. 10B illustrate examples of protocol stacks of a user plane and a control plane in a transparent payload-based NTN in a wireless communication system according to an embodiment of the present disclosure.

[0030] FIG. 11a and FIG. 11b illustrate examples of protocol stacks of a user plane and a control plane in a regenerative payload-based NTN in a wireless communication system according to an embodiment of the present disclosure.

[0031] Figure 12 illustrates an example of an NTN providing non-terrestrial NR access to a UE by means of an NTN payload and an NTN gateway.

[0032] Figure 13 illustrates the timing relationship between objects included in NTN.

[0033] FIG. 14 illustrates an example of repeated transmission and OCC application in a wireless communication system according to one embodiment of the present disclosure.

[0034] FIG. 15 illustrates examples of OCC application techniques in a wireless communication system according to one embodiment of the present disclosure.

[0035] FIG. 16 illustrates an example of a procedure for transmitting a PUSCH using OCC in a wireless communication system according to an embodiment of the present disclosure.

[0036] FIG. 17 illustrates an example of a procedure for receiving a PUSCH with OCC applied in a wireless communication system according to an embodiment of the present disclosure.

[0037] FIG. 18 illustrates examples of OCC application when two terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 19a and FIG. 19b illustrate examples of OCC application when four terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure.

[0039] FIG. 20a and FIG. 20b illustrate examples of OCC application when eight terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure.

[0040] FIG. 21 illustrates an example of a procedure for determining an OCC sequence length in a wireless communication system according to one embodiment of the present disclosure.

[0041] FIG. 22 illustrates an example of PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0042] FIG. 23 illustrates examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0043] FIG. 24 illustrates other examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0044] FIG. 25 illustrates further examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0045] FIG. 26 illustrates examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0046] FIG. 27 illustrates other examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure.

[0047] FIG. 28 illustrates examples of allocation methods for OCC blocks when symbol-based OCC is applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0048] FIG. 29 illustrates other examples of allocation methods for OCC blocks when symbol-based OCC is applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0049] FIG. 30 illustrates examples of allocation methods of OCC blocks when slot-based OCC is applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0050] FIG. 31 illustrates other examples of allocation methods of OCC blocks when slot-based OCC is applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0051] FIG. 32 illustrates examples of allocation methods of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0052] FIG. 33 illustrates other examples of allocation methods of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to one embodiment of the present disclosure.

[0053] FIG. 34 illustrates further examples of allocation methods of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure.

[0054] FIG. 35 illustrates an example of a procedure for transmitting information about an OCC in a wireless communication system according to one embodiment of the present disclosure.

[0055] 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.

[0056] 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.

[0057] 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.”

[0058] 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.”

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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)).

[0066] 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.”

[0067] The communication system may include at least one of a terrestrial network (TN), an NTN, a 4G communication network (e.g., a long-term evolution (LTE) communication network), a 5G communication network (e.g., a new radio (NR) communication network), or a 6G communication network. Each of the 4G communication network, the 5G communication network, and the 6G communication network may include the terrestrial network and / or the NTN. The NTN may be operated based on at least one communication technology among the LTE communication technology, the 5G communication technology, and the 6G communication technology. The NTN may provide communication services in various frequency bands.

[0068] The communication networks to which the embodiments of the present disclosure are applied are not limited to those described below, and the embodiments may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the term "communication network" may be used interchangeably with the term "communication system."

[0069] FIG. 1a and FIG. 1b illustrate the structure of a transparent-based non-terrestrial network (NTN) according to an embodiment of the present disclosure.

[0070] Referring to FIG. 1A, the NTN may include a satellite (110), a communication node (120), a gateway (130), a data network (140), etc. A unit including the satellite (110) and the gateway (130) may be referred to as a remote radio unit (RRU). 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.

[0071] The communication node (120) may include a communication node located on the ground (e.g., a UE, a 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.

[0072] In NTN, three types of service links can be supported as follows:

[0073] - 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).

[0074] - 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).

[0075] - 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).

[0076] 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.

[0077] 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 an 'NTN gateway'. Communication between the satellite (110) and the gateway (130) may be performed based on a 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.

[0078] As shown in Fig. 1b, in a transparent payload-based NTN, a base station and a core network may exist between a gateway (130) and a data network (140).

[0079] 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.

[0080] FIGS. 2A to 2C illustrate the structure of a regenerative-based NTN according to an embodiment of the present disclosure.

[0081] Referring to FIG. 2A, the NTN may include a first satellite (211), a second satellite (212), a communication node (220), a gateway (230), a data network (1240), etc. Each of the first satellite (211) and the second satellite (212) may perform a regeneration 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 NTN (e.g., a communication node (220), a gateway (230)) and transmit the regenerated payload.

[0082] Each of the first satellite (211) and the second satellite (212) may be a LEO satellite, an MEO satellite, a GEO satellite, an HEO satellite, or a UAS platform. The UAS platform may include a HAPS. Satellite #1 (211) may be connected to the second satellite (212), and an inter-satellite link (ISL) may be established between the first satellite (211) and the second satellite (212). The ISL may operate in a radio frequency (RF) frequency or an optical band. The ISL may be optional. The communication node (220) may include a ground-based communication node (e.g., a 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). The first satellite (211) may be referred to as an NTN payload. The first satellite (211) can provide communication services to a communication node (220) using one or more beams.

[0083] The communication node (220) can perform communication (e.g., downlink communication, uplink communication) with the first satellite (211) using 4G communication technology, 5G communication technology, and / or 6G communication technology. Communication between the first satellite (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 other base stations (e.g., base stations supporting 4G functions, 5G functions, and / or 6G functions) as well as the first satellite (211), and can perform DC operations based on technologies defined in the 4G standard, the 5G standard, and / or the 6G standard.

[0084] The gateway (230) may be located on the ground, and a feeder link may be established between the first satellite (211) and the gateway (230), and a feeder link may be established between the second satellite (212) and the gateway (230). The feeder link may be a wireless link. If an ISL is not established between the first satellite (211) and the second satellite (212), the feeder link between the first satellite (211) and the gateway (230) may be established mandatorily. Communication between the first satellite (211) and satellite #2 (212) and the gateway (230) may be performed based on an NR-Uu interface, a 6G-Uu interface, or an SRI. The gateway (230) may be connected to a data network (240).

[0085] As in the embodiments of FIGS. 2b and 2c, a core network may exist between the gateway (230) and the data network (240).

[0086] 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 the NG-C / U interface or the 6G-C / U interface. The function of the base station may be performed by a satellite. That is, the base station may be located on the satellite. Payloads may be processed by the base station located on the 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 NTN of FIG. A-2b, an ISL between satellites may not be established, and in the NTN of FIG. A-2c, an ISL between satellites may be established.

[0087] Meanwhile, entities (e.g., satellites, base stations, UEs, communication nodes, gateways, etc.) constituting the NTN 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.

[0088] FIG. 3 illustrates a block diagram of a device according to an embodiment of the present disclosure. The structure illustrated in FIG. 3 may be understood as the structure of at least a portion of a communication node, base station, satellite, or core network entity. The wireless device (300) illustrated in FIG. A-3 may be a mobile terminal such as a smartphone, tablet PC, or wearable device, but is not limited thereto.

[0089] FIG. 3 illustrates an example of a wireless device (300) in a wireless communication system according to one embodiment of the present disclosure. The wireless device (300) according to the embodiment of the present disclosure may be a mobile terminal such as a smartphone, tablet PC, or wearable device, but is not limited thereto.

[0090] Referring to FIG. 3, the wireless device (300) may include at least one control unit (310), at least one memory (320), at least one power unit (330), at least one transceiver unit (340), at least one input unit (350), at least one output unit (360), and / or at least one antenna (370).

[0091] The control unit (310) can control the memory (320) and / or the transceiver (340), and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The memory (320) can be connected to the control unit (310) and can store various information related to the operation of the control unit (310). For example, the memory (320) can perform some or all of the controls controlled by the control unit (310), or store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The configuration of the memory is not limited in a specific manner. For example, it can be configured as at least one of a read-only memory (ROM) and a random access memory (RAM).

[0092] At least one control unit (310) may be referred to as a processor, microcontroller, microprocessor, or microcomputer. The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of codes, instructions, and / or a set of instructions. Here, the firmware or software may execute another program stored in the memory (320), such as an OS. The control unit (310) may be implemented to support beamforming or directional routing operations in which signals from at least one antenna (370) are weighted differently to effectively steer signals outgoing in a desired direction.

[0093] Additionally, at least one control unit (310) may be coupled to a backhaul or network interface. The wireless device (300) may communicate with other wireless devices through the backhaul or network interface. The control unit (310) may include at least one processor. The processor may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present disclosure are performed.

[0094] At least one transceiver (340) may be connected to the control unit (310) and may transmit and / or receive a wireless signal via at least one antenna (370). The transceiver (340) may include a transmitter and / or a receiver. The at least one transceiver (340) may transmit user data, control information, wireless signals / channels, etc. mentioned in the methods and / or operation flowcharts of the present disclosure to at least one other device. For example, the at least one transceiver (340) may be connected to at least one control unit (310) and may transmit and receive wireless signals. In addition, the at least one control unit (310) may control the at least one transceiver (340) to transmit user data, control information, or wireless signals to at least one other device. The at least one transmitter (340) may receive a signal transmitted by another wireless device from at least one antenna (370). Additionally, at least one transceiver (24) may down-convert or up-convert the received signal to generate a baseband signal. At least one antenna (370) may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0095] The input unit (350) can obtain information such as user input, video, and audio, and may include various input means such as various mechanical / electronic input means, cameras, and microphones. The output unit (360) is for providing information to users by generating output related to sight, hearing, or touch, and may include a display, a speaker, a vibration module, and the like. The wireless device (300) supplies power through the power supply unit (330), and the power supply unit (330) may include a wired / wireless charging circuit, a battery, and the like.

[0096] A more detailed example of the structure of the control unit (310) and / or the transceiver unit (340) is shown in FIG. 4. FIG. 4 illustrates a block diagram of devices performing communication according to one embodiment of the present disclosure. FIG. 4 illustrates the structure of a first communication node (400a) and a second communication node (400b) that transmit and / or receive signals. In FIG. 4, each of the first communication node (400a) and the second communication node (400b) may be a base station or a UE.

[0097] Referring to FIG. 4, a first communication node (400a) can transmit a signal to a second communication node (400b). A transmission processor (411) included in the first communication node (400a) can receive data (e.g., a data unit) from a data source (410). The transmission processor (411) can receive control information from a controller (416). The control information can 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).

[0098] The transmitting processor (411) may perform a processing operation (e.g., an encoding operation, a symbol mapping operation, etc.) on data to generate data symbol(s). The transmitting processor (411) may perform a processing operation (e.g., an encoding operation, a symbol mapping operation, etc.) on control information 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.

[0099] 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). The output (e.g., 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).

[0100] 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).

[0101] 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).

[0102] 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).

[0103] 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).

[0104] 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.

[0105] FIG. 5a and FIG. 5b illustrate block diagrams of a transmission path and a reception path of a communication node according to an embodiment of the present disclosure.

[0106] 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), an S-to-P (serial-to-parallel) block (512), an N IFFT (Inverse Fast Fourier Transform) block (513), a P-to-S (parallel-to-serial) block (514), a CP (cyclic prefix) addition block (515), and an UC (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.

[0107] 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., low-density parity check (LDPC) coding operation, polar coding operation, etc.) and a modulation operation (e.g., quadrature phase shift keying (QPSK), 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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, in FIGS. 5A and 5B , some blocks 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.

[0112] FIG. 6 illustrates an example of a system frame in a wireless communication system according to an embodiment of the present disclosure.

[0113] Referring to Figure 6, time resources in a communication system can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0114] A system frame may include two half frames. A half frame may be 5 ms long. A half frame located at the beginning of the system frame may be referred to as "half frame #0," and a half frame located at the end of the system frame may be referred to as "half frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9."

[0115] FIG. 7 illustrates an example of a subframe in a wireless communication system according to an embodiment of the present disclosure.

[0116] Referring to Fig. 7, one subframe can include n slots, where n can be a natural number. Therefore, one subframe can be composed of one or more slots.

[0117] FIG. 8 illustrates an example of a slot in a wireless communication system according to an embodiment of the present disclosure.

[0118] Referring to Figure 8, a single slot may contain one or more symbols. A single slot, as illustrated in Figure A-8, may contain 14 symbols. The length of a slot may vary depending on the number and length of symbols contained in the slot. Alternatively, the length of a slot may vary depending on the numerology.

[0119] In a communication system, the numerology applied to physical signals and channels can be variable. The numerology can be variable to meet various technical requirements of the communication system. In a communication system applying CP (cyclic prefix)-based OFDM waveform technology, the numerology can include subcarrier spacing and CP length (or CP type). [Table 1] may be an embodiment of a method for configuring a numerology for a CP-OFDM-based communication system. At least some of the numerologies in [Table 1] may be supported depending on the frequency band in which the communication system operates. In addition, the communication system may additionally support numerologies not listed in [Table 1].

[0120] Subcarrier spacing 15kHz 30kHz 60kHz 120kHz 240kHz 480kHz OFDM symbol length [μs] 66.733.316.78.34.22.1 CP length [us] 4.762.381.190.600.300.151 Number of OFDM symbols in ms 142856112224448

[0121] When the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length can be 1 ms. In this case, one system frame can contain 10 slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length can be 0.5 ms. In this case, one system frame can contain 20 slots. When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, one system frame can contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, one system frame can contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, one system frame can contain 160 slots.

[0122] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting of only DL symbols may be referred to as a "DL slot," a slot consisting of only FL symbols may be referred to as an "FL slot," and a slot consisting of only UL symbols may be referred to as a "UL slot."

[0123] FIG. 9 illustrates the timing relationship of uplink and downlink in a wireless communication system according to an embodiment of the present disclosure.

[0124] There is one frame set in the single link, and one frame set in the downlink of each carrier. The uplink frame number i for transmission from the UE is It must be started before, and must coincide with the start of the corresponding downlink frame observed at the UE.

[0125] Here, and can be provided by adjusting the transmission timing of the synchronization procedure. However, for msgA transmission on PUSCH (physical uplink shared channel), NTA = 0.

[0126] is derived from the upper layer parameters ta-Common, ta-CommonDrift, ta-CommonDriftVariant, which if not configured am.

[0127] is computed by the UE only if the UE's position and related upper layer parameters are configured according to the transmission timing adjustment of the synchronization procedure, otherwise am.

[0128] As described above, the timing of downlink and uplink can be adjusted based on the transmission timing adjustment of the synchronization procedure. For example, the terminal can receive the value of at least one timing advance (TA) offset for the serving cell and adjust the timing based on the received at least one TA offset value. Here, the at least one TA offset value can be configured differently depending on the TCI state, the carrier, or the TRP.

[0129] The aforementioned TA (timing advance) can be determined based on the signal transmission and reception times of the random access procedure. Specifically, the terminal can identify uplink resources and determine uplink transmission power based on control information and / or configuration information received from the base station. Then, the terminal can transmit a PUSCH using the identified resources and the determined power. For example, the base station can determine the TA based on the arrival time of the preamble transmitted by the terminal.

[0130] A terminal that has performed a random access procedure can receive configuration information from the base station and transmit a PUSCH based on the configuration information. Specifically, the terminal can identify uplink resources and determine uplink transmission power based on control information and / or configuration information received from the base station. Then, the terminal can transmit a PUSCH using the identified resources and the determined power. Section 7.11 of 3GPP TS 38.213 defines the PUSCH transmission procedure for the terminal as follows.

[0131]

[0132] The aforementioned PUSCH transmission can be controlled via a physical uplink control channel (PUCCH). In NR, a terminal transmits uplink control information (UCI) to a base station via the PUCCH. The control information may include at least one of a HARQ-ACK indicating whether demodulation / decoding of a TB (transport block) received by the terminal via the PDSCH was successful, a scheduling request (SR) for requesting resource allocation from a PUSCH base station for uplink data transmission by the terminal, and channel state information (CSI), which is information for reporting the channel status of the terminal. The PUCCH can be repeatedly transmitted, and the repeated transmission procedure can be performed based on the following section 9.2.6 of 3GPP TS 38.213.

[0133]

[0134] Meanwhile, NTN reference scenarios can be defined as shown in [Table 4] below.

[0135] NTN shown in Fig. 1 NTNGEO shown in Fig. 2 Scenario A Scenario BLEO (steerable beam) Scenario C1 Scenario D1 LEO (beam moving with satellite) Scenario C2 Scenario D2

[0136] If the satellite (110) in the NTN illustrated in FIG. 1a and / or FIG. 1b is a GEO satellite (e.g., a GEO satellite supporting transparent functionality), this may be referred to as “Scenario A.” If the first satellite (211) and the second satellite (212) in the NTN illustrated in FIG. 2a, FIG. 2b, and / or FIG. 2c are each GEO satellites (e.g., GEO supporting regeneration functionality), this may be referred to as “Scenario B.” 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.” In the non-terrestrial network illustrated in FIGS. 2A, 2B, and / or 2C, if each of satellite #1 (211) and satellite #2 (212) is a LEO satellite having steerable beams, this may be referred to as "Scenario D1." In the non-terrestrial network illustrated in FIGS. 2A, 2B, and / or 2C, if each of satellite #1 (211) and satellite #2 (212) is a LEO satellite having beams that move together with the satellite, this may be referred to as "Scenario D2."

[0137] Parameters for the NTN reference scenarios defined in [Table 4] can be defined as shown in [Table 5] below.

[0138] Scenario A and B Scenario C and D Altitude 35,786 km 600 km 1,200 km Spectrum (service link) <6 GHz (e.g., 2 GHz) > 6 GHz (e.g., DL 20 GHz, UL 30 GHz) Maximum channel bandwidth capability (service link) 30 MHz for band < 6 GHz 1 GHz for band > 6 GHz Maximum distance between satellite and communication node (e.g., UE) at minimum elevation angle 40,581 km 1,932 km (600 km altitude) 3,131 km (1,200 km altitude) Maximum round trip delay (RTD) (propagation delay only) Scenario A: 541.46 ms (service and feeder links) Scenario B: 270.73 ms (service link only) Scenario C: (Transparent payload: service and feeder links) -25.77 ms (600 km) Altitude) -41.77ms (1200km altitude) Maximum differential delay within a cell 10.3m3.12ms (600km altitude) 3.18ms (1200km altitude) Service link NR or 6G Feeder link Radio interface defined in 3GPP or non-3GPP

[0139] Additionally, in the NTN reference scenario defined in [Table 4], the delay constraint can be defined as in [Table 6] below.

[0140] Scenario A Scenario B Scenario C1-2 Scenario D1-2 Satellite altitude 35,768 km 600 km Maximum RTD on the air interface between the base station and the UE 541.75 ms (worst case) 270.57 ms 28.41 ms 12.88 ms Minimum RTD on the air interface between the base station and the UE 477.14 ms 238.57 ms 8 ms 4 ms

[0141] FIG. 10A and FIG. 10B illustrate examples of protocol stacks of a user plane and a control plane in a transparent payload-based NTN in a wireless communication system according to an embodiment of the present disclosure.

[0142] Referring to FIGS. 10A and 10B , user data may be transmitted and / or received between a UE and a core network (e.g., UPF), and control data (e.g., control information) may be transmitted and / or received between a UE and a core network (e.g., AMF). Each of the user data and the control data may be transmitted and / or received via a satellite and / or a gateway. The protocol stack of the user plane illustrated in FIG. 10A may be applied identically or similarly to a 6G communication network. The protocol stack of the control plane illustrated in FIG. 10B may be applied identically or similarly to a 6G communication network.

[0143] FIG. 11a and FIG. 11b illustrate examples of protocol stacks of a user plane and a control plane in a regenerative payload-based NTN in a wireless communication system according to an embodiment of the present disclosure.

[0144] Referring to FIGS. 11A and 11B , user data and control data (e.g., control information) may be transmitted and / or received via an interface between a UE and a satellite (e.g., a base station). The user data may include a user protocol data unit (PDU). The protocol stack of the satellite radio interface (SRI) may be used to transmit and / or receive the user data and / or control data between the satellite and the gateway. The user data may be transmitted and / or received via a GPRS (general packet radio service) tunneling protocol (GTP)-U tunnel between the satellite and the core network.

[0145] In relation to NTN communication, an NTN may be configured to provide non-terrestrial NR access to a UE via an NTN payload and an NTN gateway. A service link may refer to a connection between an NTN payload and a UE, and a feeder link may refer to a link between an NTN gateway and an NTN payload. The configuration and procedures for the NTN, service link, and feeder link may be implemented in combination with, or partially performed or modified from, the configuration and procedures disclosed in section 16.14 of 3GPP TS 38.300.

[0146] Figure 12 illustrates an example of an NTN providing non-terrestrial NR access to a UE via an NTN payload and an NTN gateway. Figure 12 shows a service link between the NTN payload and the UE, and a feeder link between the NTN gateway and the NTN payload.

[0147] The NTN payload transparently transmits wireless protocols received from the UE via the service link to the NTN gateway via the feeder link, or vice versa. The connectivity supported by the NTN payload is as follows.

[0148] - NTN gateway can serve multiple NTN payloads.

[0149] - A single NTN payload can be served by multiple NTN gateways.

[0150] - NTN payloads can change carrier frequency before being retransmitted on the service link, or vice versa (on each feeder link).

[0151] In NTN, in addition to the network identifier, the following may apply:

[0152] - A tracking area corresponds to a fixed geographic area. Each mapping is configured in the RAN.

[0153] - Mapped cell ID as defined in Section 16.14.5.

[0154] Three types of service links are supported:

[0155] - 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).

[0156] - 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 producing steerable beams).

[0157] - Earth-moving: The service link may be provided by beam(s) moving over the surface of the Earth (e.g., NGSO satellites producing fixed beams or non-steerable beams).

[0158] A gNB operating as an NGSO satellite can provide a quasi-Earth fixed service link or an Earth mobile service link, and a gNB operating as a GSO satellite can provide an Earth fixed service link.

[0159] Timing and synchronization are as follows:

[0160] Regarding scheduling and timing, downlink and uplink frames are aligned using an offset given by the NTA offset (see Section 4.2 of TS 38.213) from the uplink time synchronization reference point (RP). To accommodate the propagation delay of the NTN, some timing relationships are enhanced by a common timing advance (TA) and two offsets, K_offset and k_mac.

[0161] - Common TA is a timing offset configured equal to the round trip time (RTT) between the RP and NTN payloads.

[0162] - K offset is a configured scheduling offset that must be greater than or equal to the sum of the service link RTT and common TA.

[0163] - k mac is an offset that is configured to be approximately equal to the RTT between the RP and gNB.

[0164] Scheduling offset K offset is used to allow the UE sufficient processing time between downlink reception and uplink transmission (see TS 38.213). Offset k mac is used to delay the application of downlink configuration indicated by MAC CE command on PDSCH (see TS 38.213) and for estimation of UE-gNB RTT (see TS 38.321). If downlink and uplink frame timing are not aligned at the gNB, offset k mac can be provided by the network. Also, the offset k mac is used to determine the RAR window / MsgB window start time after sending Msg1 / MsgA in the random access procedure (see TS 38.213). Service link RTT, feeder link RTT, RP, common TA, k mac And TTA is as shown in Fig. 13. Fig. 13 shows the timing relationship between objects included in NTN.

[0165] The network can configure HARQ operation as follows:

[0166] - For downlink, HARQ feedback can be enabled or disabled on a per-HARQ process basis. Disabling HARQ feedback allows scheduling a HARQ process before one HARQ RTT has elapsed since the last scheduling.

[0167] - For uplink, HARQ modes (e.g., HARQ mode A or HARQ mode B) can be configured for each HARQ process. HARQ mode B allows scheduling a HARQ process before one HARQ RTT has elapsed since the last scheduling.

[0168] For HARQ processes configured to have HARQ feedback enabled / disabled, it is up to the network implementation to ensure the appropriate HARQ feedback configuration (e.g., all enabled or all disabled) for the HARQ processes used in the SPS configuration. For HARQ processes configured in HARQ mode, it is up to the network implementation to ensure the appropriate HARQ mode configuration (e.g., all HARQ mode A or all HARQ mode B) for the HARQ processes used in the configured grant (CG) configuration.

[0169] Meanwhile, in NTN, a base station can transmit system information (e.g., SIB19) containing satellite assistance information for NTN access. A UE can receive system information (e.g., SIB19) from the base station, check the satellite assistance information included in the system information, and perform communication (e.g., non-terrestrial communication) based on the satellite assistance information. SIB19 can include the information element(s) defined in [Table 7] below.

[0170] SIB19-r17 :: = SEQUENCE {ntn-Config-r17 NTN-Config-r17 OPTIONAL,t-service-r17 INTEGER(1..549755813887) OPTIONAL,referenceLocation-r17 ReferenceLocation-r17 OPTIONAL,distanceThresh-r17 INTEGER(1..65525) OPTIONAL,ntn-NeighCellConfigList-r17 NTN-NeighCellConfigList-r17 OPTIONAL,lateNonCRiticalExtension OCTET STRING...,[[ntn-NeighCellConfigListExt-v1720 NTN-NeighCellConfigList-r17 OPTIONAL,]],[[movingReferenceLocation-r18 ReferenceLocation-r17 OPTIONAL,satSwitchWithReSync-r18 SatSwitchWithReSync-r18 OPTIONAL,]]}NTN-NeighCellConfigList-r17 :: = SEQUENCE (SIZE(1..maxCellNTN-r17)) OFNTN-NeighCellConfig-r17NTN-NeighCellConfig-r17 :: = SEQUENCE {ntn-Config-r17 NTN-Config-r17 OPTIONAL,carrierFreq-r17 ARFCN-ValueNR OPTIONAL,physCellId-r17 PhysCellId OPTIONAL}SatSwitchWithReSync-r18 :: = SEQUENCE {ntn-Config-r18 NTN-Config-r17,t-ServiceStart-r18 INTEGER(1..549755813887) OPTIONAL,ssb-TimeOffset-r18 INTEGER(1..159) OPTIONAL}

[0171] NTN-Config defined in [Table 7] may include information element(s) defined in [Table 8] below.

[0172] NTN-Config-r17 ::= SEQUENCE {epochTime-r17 EpochTime-r17ntn-UISyncValidityDuration-r17 ENUMERATED {s5, s10, s15, s20, s25, s30, s35, s40, s45, s50, s55, s60, s120, s180, s240, s900}cellSpecificKoffset-r17 INTEGER(1..1023)kmac-r17 INTEGER(1..512)ta-Info-r17 TA-Info-r17ntn-PolarizationDL-r17 ENUMERATED {rhcp, lhcp, linear}ntn-PolarizationUL-r17 ENUMERATED {rhcp, lhcp, linear}ephemerisInfo-r17 EphemerisInfo-r17ta-Report-r17 ENUMERATED {enabled}...}EpochTime-r17 ::= SEQUENCE {sfn-r17 INTEGER(1..1023)subFrameNR-r17 INTEGER(1..9)}TA-Info-r17 ::= SEQUENCE {ta-Common-r17 INTEGER(1..66485757)ta-CommonDrift-r17 INTEGER(-257303..257303)ta-CommonDriftVarant-r17 INTEGER(0..28949)}

[0173] EphemerisInfo defined in [Table 8] may include information element(s) defined in [Table 9] below.

[0174] EphemerisInfo-r17 ::= CHOICE {positionVelocity-r17 PositionVelocity-r17,orbital-r17 Orbital-r17}PositionVelocity-r17 ::= SEQUENCE {positionX-r17 PositionStateVector-r17,positionY-r17 PositionStateVector-r17,positionZ-r17 PositionStateVector-r17, velocity V INTEGER (0..1048575),periapsis-r17 INTEGER (0..268435455),longitude-r17 INTEGER (0..268435455),incliating-r17 INTEGER (-67108864..67108863),meanAnomaly-r17 INTEGER (0..268435455)}PositionStateVector-r17 ::= INTEGER (-33554432..33554431)VelocityStateVector-r17 ::= INTEGER (-131072..131071)

[0175] Additionally, if there is a difference in the NTN connection setup compared to the TN connection, the NTN-parameter may include the information elements defined in [Table 10] below to convey the UE wireless connection capability parameters applicable to the NTN connection.

[0176] NTN-parameters-r17 ::= SEQUENCE {inactiveStateNTN-r17 ENUMERATED {supported} OPTIONAL,ra-SDT-NTN-r17 ENUMERATED {supported} OPTIONAL,srb-SDT-NTN-r17 ENUMERATED {supported} OPTIONAL,measAndMobParametersNTN-r17 MeasAndMobParameters OPTIONAL,mac-ParametersNTN-r17 Mac-Parameters OPTIONAL,phy-ParametersNTN-r17 Phy-Parameters OPTIONAL,fdd-ADD-UE-NR-CapabilitiesNTN-r17 UE-NR-CapabilityNTNAddXDD-Mode OPTIONAL,frl-ADD-UE-NR-CapabilitiesNTN-r17 UE-NR-CapabilityNTNAddFRX-Mode OPTIONAL,ue-BasedPerfMeas-ParametersNTN-r17 UE-BasedPerfMeas-Parameters-r16 OPTIONAL,son-ParametersNTN-r17 SON-Parameters-r16 OPTIONAL}

[0177] Typically, cells supported by NTN base stations have a wider radius than cells supported by TNs. Furthermore, the distance between an NTN terminal and a base station, or between a terminal and a satellite relaying signals between the base station and the terminal, is much longer than the distance between a TN terminal and a base station. Accordingly, techniques have been proposed to enhance the transmission signal power and coverage of terminals with transmission power constraints in the uplink environment of NTN cells. For example, a repetition scheme has been proposed, in which a terminal transmits a specific symbol multiple times across multiple time and / or frequency resources.

[0178] Repeated transmission utilizes more time and / or frequency resources to transmit the same signal than when repeated transmission is not applied. Therefore, repeated transmission by a specific terminal may reduce the time and / or frequency resources available to other terminals. In particular, NTN cells have a very wide cell radius, resulting in a large number of potential serviceable terminals within the cell. However, repeated transmission to improve the transmission power of a specific terminal may result in a decrease in the total number of terminals accessible to the NTN base station. Therefore, a method that can increase uplink capacity by considering these issues is needed.

[0179] To increase capacity during uplink repetitive transmission in NTN, orthogonal cover code (OCC) can be applied. OCC is a method used for transmission of some PUCCH formats in Release-18, in which signals from multiple terminals sharing the same time and / or frequency resources are distinguished by orthogonal codes such as Hadamard sequences and DFT sequences. That is, the symbols that each terminal wishes to transmit are spread using different sequences, and the spread symbols can be mapped to the same time and / or frequency resources and transmitted. The base station that receives this can detect the signals transmitted by each terminal by performing despreading on the signals in all time and / or frequency resources transmitted via OCC.

[0180] FIG. 14 illustrates an example of repeated transmission and OCC application in a wireless communication system according to an embodiment of the present disclosure. FIG. 14 illustrates an example of using a Hadamard sequence of length 4 as an OCC sequence. In FIG. 14, solid-line blocks are obtained by multiplying the transmission symbol prior to repetition by +1, and dotted-line blocks are obtained by multiplying the transmission symbol prior to repetition by -1.

[0181] Referring to FIG. 14, the first case (case 1) is an example of conventional repetitive transmission, and the second case (case 2) is an example of repetitive transmission using an OCC sequence. In the case of repetitive transmission using an OCC sequence, each terminal obtains spread symbols for a symbol to be transmitted by applying an OCC sequence of length 4 to the symbol to be transmitted, and transmits the spread symbols. At this time, the spread symbols refer to repetitive symbols obtained using the OCC sequence. For example, UE1 may apply the OCC sequence '+1 -1 -1 +1' to the transmitted symbol, UE2 may apply the OCC sequence '+1 -1 +1 -1' to the transmitted symbol, UE3 may apply the OCC sequence '+1 +1 -1 -1' to the transmitted symbol, and UE4 may apply the OCC sequence '+1 +1 +1 +1' to the transmitted symbol. Each UE may obtain spread symbols for the symbol to be transmitted using a different OCC sequence. At this time, the base station can obtain the symbol of UE1 by performing despreading using the OCC sequence '+1 -1 -1 +1'.

[0182] Among the OCC techniques described above, OCC within a symbol (OCC), OCC across symbols (OCC across slots), and OCC across slots (OCC across slots) are being considered. Intra-symbol OCC is a method in which each element of an OCC sequence is applied to a portion of a symbol through a Pre-DFT (Discrete Fourier Transform) method in which OCC is assigned to each resource before DFT. Symbol-wise OCC is a method in which each element of an OCC sequence is applied to an individual symbol unit, and slot-wise OCC is a method in which each element of an OCC sequence is applied to an individual slot unit, i.e., commonly to symbols within the corresponding slot.

[0183] FIG. 15 illustrates examples of OCC application techniques in a wireless communication system according to an embodiment of the present disclosure. FIG. 15 illustrates three techniques for applying OCC: case a is an example of applying OCC within a symbol, case b is an example of applying OCC on a symbol-by-symbol basis, and case c is an example of applying OCC on a slot-by-slot basis. FIG. 15 illustrates an example in which a Hadamard sequence of length 2 is used as an OCC sequence and the number of repetitions is 2. Here, the first blocks among blocks having the same pattern are obtained by multiplying the transmission symbol before repetition by an element +1 of the Hadamard sequence, and the second blocks among blocks having the same pattern are obtained by multiplying the transmission symbol before repetition by an element -1 of the Hadamard sequence. In the present disclosure, the symbol-by-symbol OCC may be understood as an inter-symbol OCC, and the slot-by-slot OCC may be understood as an inter-slot OCC.

[0184] Currently, the maximum number of terminals (e.g., UEs) that can be multiplexed via OCC is considered to be 8. On the other hand, the length of repeated transmissions in the physical uplink shared channel (PUSCH) in the existing standard, i.e., the repetition factor, is at most 32. In addition, the length of the OCC sequence of each of the intra-symbol OCC, symbol-level OCC, and slot-level OCC techniques is considered to be at most 4. Therefore, there is a need for development of a matching method and procedure for the repetition factor and OCC length, and a related signaling information generation method that considers the application of both individual OCC techniques and / or multiple OCC techniques. Therefore, in this disclosure, we propose an OCC application method for increasing the uplink capacity of NTN and a signaling information generation method therefor.

[0185]

[0186] Figure 16 illustrates an example of a procedure for transmitting a PUSCH using OCC in a wireless communication system according to an embodiment of the present disclosure. Figure 16 illustrates a method performed by a terminal. The terminal may be understood as a UE.

[0187] Referring to FIG. 16, in step S1601, a terminal receives DCI including an UL grant. The UL grant may include at least one of information on uplink resources for PUSCH transmission by the terminal, or information related to PUSCH repetition (e.g., information on whether to perform repeated transmission). In other words, the terminal may receive DCI including at least one of information on uplink resources for PUSCH transmission or information related to PUSCH repetition from the base station. According to one embodiment, the DCI may further include information on an OCC. The information on the OCC may include information necessary for the terminal to apply the OCC to the PUSCH. For example, the information on the OCC may include at least one of information on the length of the OCC sequence, or information indicating the value of the OCC sequence (e.g., an OCC sequence ID). In addition, the information on the OCC may further include at least one of whether to apply at least one OCC technique, at least one OCC technique to be applied, or an OCC block allocation interval. When there are multiple OCC techniques to be applied to a terminal, information about the OCC sequence length may include the OCC sequence length for each of the multiple OCC techniques, and information indicating the value of the OCC sequence may include the value of the OCC sequence for each of the multiple OCC techniques.

[0188] In step S1603, the terminal generates symbols containing data. The terminal generates symbols containing data based on the DCI. In other words, the terminal can identify information about uplink resources for PUSCH transmission or information related to PUSCH repetition based on the DCI, and generate symbols containing data based on the identified information.

[0189] In step S1605, the terminal applies an OCC. The terminal applies the OCC to signals included in a plurality of slots including the generated symbols. At this time, the signals form at least one repetitive transmission block for repeated transmission. The terminal can generate a plurality of slots forming at least one repetitive transmission block by applying an OCC based on information about the OCC to symbols including data to be repeatedly transmitted based on a PUSCH repetition transmission type (e.g., PUSCH repetition type A or PUSCH repetition type B). Information about the OCC can be received via UE-specific signaling, such as a DCI, MAC CE, or RRC message, or via cell-specific signaling or group-specific signaling, such as an SIB. For example, the terminal can generate a plurality of slots forming at least one repetitive transmission block for repeated transmission by applying a slot-wise OCC with an OCC sequence length of 2 or 4 to symbols including data to be repeatedly transmitted based on PUSCH repetition type A. At this time, the length of the OCC sequence can be determined based on a repetition factor of the repetitive transmission. For example, the length of an OCC sequence can be determined by a divisor that is less than or equal to the repetition factor.

[0190] At step S1607, the terminal transmits a signal. The terminal transmits the signal with OCC applied to the base station.

[0191]

[0192] Figure 17 illustrates an example of a procedure for receiving a PUSCH with OCC applied in a wireless communication system according to an embodiment of the present disclosure. Figure 17 illustrates a method performed by a base station. The base station may be understood as an NTN base station.

[0193] Referring to FIG. 17, in step S1701, the base station transmits DCI including an UL grant. The UL grant may include at least one of information on uplink resources for PUSCH transmission of the UE, or information related to PUSCH repetition (e.g., information on whether to perform repeated transmission). In other words, the base station may transmit to the UE the DCI including at least one of information on uplink resources for PUSCH transmission of the UE, or information related to PUSCH repetition. According to one embodiment, the DCI may further include information on an OCC. The information on the OCC may include information necessary for the UE to apply the OCC to the PUSCH. For example, the information on the OCC may include at least one of information on the length of the OCC sequence, or information indicating the value of the OCC sequence (e.g., an OCC sequence ID). In addition, the information on the OCC may further include at least one of whether to apply at least one OCC technique, at least one OCC technique to be applied, or an OCC block allocation interval. When there are multiple OCC techniques to be applied to a terminal, information about the OCC sequence length may include the OCC sequence length for each of the multiple OCC techniques, and information indicating the value of the OCC sequence may include the value of the OCC sequence for each of the multiple OCC techniques.

[0194] In step S1703, the base station receives a signal. The base station can receive signals transmitted in a plurality of slots. The signals are included in a plurality of slots including symbols including data, and may be signals to which at least one orthogonal covering code (OCC) technique is applied. Here, the at least one OCC technique may include at least one of intra-symbol OCC, symbol-wise OCC, or slot-wise OCC. The base station can obtain a transmission symbol of the terminal by performing despreading for a plurality of slots based on information about the OCC transmitted to the terminal. Information about the OCC can be transmitted via UE-specific signaling, such as a DCI, MAC CE, or RRC message, or via cell-specific signaling or group-specific signaling, such as a SIB.

[0195]

[0196] 1) OCC application scheme

[0197] The present disclosure considers the application of a single OCC technique or multiple OCC techniques. Currently, when a single OCC technique is used, cases where the OCC length is 2 or 4 are considered, and multiplexing of up to 8 UEs is considered possible through OCC application. Accordingly, 16 OCC application methods are available, as shown in [Table 11] below. Considering the conditions for the OCC length of a single technique and the total number of UEs that can be multiplexed, the OCC lengths of each technique can be determined together when determining the OCC application method.

[0198] CaseOCC within symbolOCC across symbolsOCC across slots# of multiplexed UEs12N / AN / A22N / A2N / A3N / AN / A244N / AN / A45N / A4N / A6N / AN / A4722N / A82N / A29N / A221024N / A81142N / A122N / A4134N / A214N / A2415N / A4216222

[0199] In [Table 11], according to Cases 1 to 3, multiplexing of two UEs is possible, and a single OCC technique with an OCC length of 2 can be used. According to Cases 4 to 9, multiplexing of four UEs is possible, and a single OCC technique with an OCC length of 4 can be used, or two OCC techniques with an OCC length of 2 can be used simultaneously. According to Cases 10 to 16, multiplexing of eight UEs is possible, and two OCC techniques with an OCC length of 4 and 2 can be used simultaneously, or three OCC techniques with an OCC length of 2 can be used simultaneously.

[0200] Application examples of the aforementioned methods are shown in FIGS. 18, 19a, 19b, 20a, and 20b. Here, a single OCC scrambling / descrambling unit is represented by the same pattern. The number of symbols contained in a single slot is 12 or 14, but for the sake of illustration, only 4 symbols are shown in a single slot.

[0201] FIG. 18 illustrates examples of OCC application when two terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure. Referring to FIG. 18, the first case (case 1) to the third case (case 3) correspond to cases 1 to 3 of [Table 11]. The first case is an example where an OCC is applied within a symbol, the length of the OCC is 2, and symbol 4 is used for the OCC. The second case is an example where a symbol-level OCC is applied, the length of the OCC is 2, and symbols 3 and 4 are used for the OCC. The third case is an example where a slot-level OCC is applied, the length of the OCC is 2, and symbol 4 is used for the OCC.

[0202] FIGS. 19A and 19B illustrate examples of applying OCC when four terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure. Referring to FIGS. 19A and 19B , cases 4 (case 1) to 9 (case 9) correspond to cases 4 to 9 of [Table 11]. Case 4 is an example where an intra-symbol OCC is applied, the length of the OCC is 4, and symbol 4 is used for the OCC. Case 5 is an example where a symbol-level OCC is applied, and the length of the OCC is 4. Case 6 is an example where a slot-level OCC is applied, the length of the OCC is 4, and symbol 4 is used for the OCC. Case 7 is an example where an intra-symbol OCC and a symbol-level OCC are applied, the length of each OCC is 2, and symbols 3 and 4 are used for the OCC. Case 8 is an example where symbol-level OCC and slot-level OCC are applied, each OCC has a length of 2, and symbol 4 is used for OCC. Case 9 is an example where symbol-level OCC and slot-level OCC are applied, each OCC has a length of 2, and symbols 3 and 4 are used for OCC.

[0203] FIGS. 20A and 20B illustrate examples of applying OCC when eight terminals are multiplexed in a wireless communication system according to one embodiment of the present disclosure. Referring to FIGS. 20A and 20B , cases 10 to 16 correspond to cases 10 to 16 of Table 11. Case 10 is an example of a case where an intra-symbol OCC of length 2 and a symbol-level OCC of length 4 are applied. Case 11 is an example of a case where an intra-symbol OCC of length 4 and a symbol-level OCC of length 2 are applied, and symbols 3 and 4 are used for OCC. Case 12 is an example of a case where an intra-symbol OCC of length 2 and a slot-level OCC of length 4 are applied, and symbol 4 is used for OCC. Case 13 is an example where an intra-symbol OCC of length 4 and a slot-wise OCC of length 2 are applied, and symbol 4 is used for the OCC. Case 14 is an example where a symbol-wise OCC of length 2 and a slot-wise OCC of length 4 are applied, and symbols 3 and 4 are used for the OCC. Case 15 is an example where a symbol-wise OCC of length 4 and a slot-wise OCC of length 2 are applied. Case 16 is an example where an intra-symbol OCC of length 2, a symbol-wise OCC of length 2, and a slot-wise OCC of length 2 are applied, and symbols 3 and 4 are used for the OCC.

[0204] As described above, [Table 11], FIG. 18, FIG. 19a, FIG. 19b, FIG. 20a, and FIG. 20b are derived under the conditions that (1) all three OCC techniques are defined in the standard, (2) all combinations of OCC techniques are allowed, (3) the sequence length of each OCC technique is 2 or 4, and (4) the maximum number of multiplexable UEs is 8. Therefore, the number of available OCC techniques may be reduced or the sequence length may be limited depending on the combination of OCC techniques. For example, some of the 16 cases defined in [Table 11] may not be used.

[0205]

[0206] FIG. 21 illustrates an example of a procedure for determining an OCC sequence length in a wireless communication system according to one embodiment of the present disclosure. FIG. 21 illustrates a method performed by a terminal. The terminal may be understood as a UE.

[0207] Referring to FIG. 21, in step S2101, the terminal determines an OCC scheme to be applied. The terminal may determine at least one OCC scheme to be applied based on the PUSCH repetition type. For example, if the PUSCH repetition type determined by signaling from the base station is PUSCH repetition type A, the scheme to be applied may be determined as slot-wise OCC. As another example, if the PUSCH repetition type determined by signaling from the base station is PUSCH repetition type B, the scheme to be applied may be determined as symbol-wise OCC, slot-wise OCC, or symbol-wise OCC and slot-wise OCC. According to one embodiment, the OCC scheme to be applied may be predefined for each PUSCH repetition type or may be set by signaling from the base station.

[0208] In step S2103, the terminal determines the OCC length. The terminal may determine the length of the OCC sequence for at least one OCC technique to be applied. According to one embodiment, the terminal may obtain information about the length of the OCC sequence based on UE-specific signaling and determine the length of the OCC sequence based on the obtained information. According to one embodiment, the length of the OCC sequence may be determined based on a repetition factor for repeated transmission. For example, the length of the OCC sequence may be determined to a value less than or equal to the repetition factor. The length of the OCC sequence may be determined as a divisor of the repetition factor. If there are multiple OCC techniques to be applied, the OCC lengths may be determined for each of the multiple OCC techniques. For example, if the OCC techniques to be applied are symbol-based OCC and slot-based OCC, the OCC sequence length for symbol-based OCC and the OCC sequence length for slot-based OCC may be determined. The length of the symbol unit OCC sequence can be determined as a divisor of the repetition factor, and the length of the slot unit OCC can be determined as a divisor of the slots in which repeated transmission is performed.

[0209] In the embodiment described with reference to Figure 21, the terminal determines the OCC technique to be applied and the OCC length. Additionally, the terminal may determine at least one other piece of information necessary for OCC application. For example, the terminal may determine the OCC block allocation interval (e.g., the hopping interval). The OCC block allocation interval may be determined based on information signaled from the base station.

[0210]

[0211] 2) OCC Block Allocation Within a Repetition Block

[0212] In the present disclosure, a repetitive transmission block is a unit in which one repetitive transmission is performed and completed, and an OCC block is a scrambling / descrambling unit in which a previously determined OCC application method is applied and completed. Referring to FIGS. 18, 19a, 19b, 20a, and 20b, an OCC block is a set of rectangles having the same pattern, and an OCC sequence length is equal to the number of rectangles included in one set, i.e., one OCC block. The OCC sequence length can be understood as the length of the OCC block. For example, in the 15th case of FIG. 20, symbols 1 to 4 of slot 1 and symbols 1 to 4 of slot 2 constitute one OCC block, and symbols 1 to 4 of slot 3 and symbols 1 to 4 of slot 4 constitute another OCC block. In other words, in the 15th case of Fig. 20, two OCC blocks are configured, and each OCC sequence length is 8.

[0213] A repetitive transmission block includes resources (e.g., symbols, slots, etc.) of the minimum size for the selected OCC application method to be performed. Referring to FIG. 20, Case 15 includes a total of two repetitive transmission blocks. For example, Case 15 includes one repetitive transmission block composed of symbols 1 to 4 of slot 1 and symbols 1 to 4 of slot 2, and another repetitive transmission block composed of symbols 1 to 4 of slot 3 and symbols 1 to 4 of slot 4, and each repetitive transmission block may include one OCC block. Alternatively, Case 15 may include one repetitive transmission block composed of all symbols of slots 1, 2, 3, and 4, and one repetitive transmission slot may include two OCC blocks. That is, a repetition factor of up to 32 is supported, and an OCC is considered to support multiplexing for up to 8 UEs. Therefore, one repetitive transmission block can include at least one OCC block. Therefore, an OCC block allocation method within a repetitive transmission block is required according to the repetitive transmission type and OCC application method.

[0214] In the case of the intra-symbol OCC technique, since the application of the OCC sequence is completed within each symbol, it can be applied regardless of the number of PUSCH repetition transmissions. Therefore, the OCC length of the intra-symbol OCC technique is not considered when allocating OCC blocks within a repetitive transmission block. Accordingly, the present disclosure describes an OCC block allocation method within a repetitive transmission block that takes into account the lengths of symbol-level OCCs and slot-level OCCs.

[0215] OCC block allocation methods within a repetitive transmission block are fundamentally divided into sequential and hopping methods. In the sequential method, each OCC block can be allocated sequentially, with the next OCC block being allocated after the previous OCC block ends. The sequential method can minimize complexity, processing, and / or transmission latency. Meanwhile, in the hopping method, symbols within an OCC block can be allocated at regular intervals within the entire repetitive transmission block. The hopping method can secure diversity gains in time-varying channels.

[0216] In the hopping scheme, the allocation location of each OCC block can be determined as follows. First, the components (e.g., symbols) of the first allocated OCC block are allocated with a given interval starting from the first symbol of the repeated transmission block, and then the components (e.g., symbols) of the second allocated OCC block are allocated with a given interval starting from the earliest unallocated symbol in the repeated transmission block, and this process is repeated for the remaining OCC blocks. Therefore, the sequential scheme can be interpreted as a hopping scheme with the interval set to 1.

[0217] OCC block allocation within a repetitive transmission block can take different forms depending on the specific repetitive transmission type and OCC application method. Accordingly, application examples for each PUSCH repetition type are described below.

[0218]

[0219] A) PUSCH repetition type A and slot-wise OCC

[0220] PUSCH repetition type A is a type that is repeatedly transmitted in slot units, and the same symbols are repeatedly transmitted in the same symbol position in each slot.

[0221] FIG. 22 illustrates an example of PUSCH repetition type A in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 22, when the repetition factor is 2, PUSCH symbols are repeatedly transmitted at 10 identical symbol locations per slot. Since OCC must be applied to the identical symbols repeatedly transmitted in this way, symbol-level OCC is not applied to PUSCH repetition type A. Therefore, for PUSCH repetition type A, the OCC block allocation method within a repeated transmission block when slot-level OCC is applied will be described.

[0222] When performing slot-based repetitive transmission, if slot-based OCC is applied, the length of the slot-based OCC can be determined as a divisor of the PUSCH repetition factor. At this time, the length of the slot-based OCC can be determined regardless of whether the OCC is applied within a symbol. In addition, the length of the OCC within a symbol can be determined regardless of the repetition factor. When slot-based OCC is applied, the number of OCC blocks included in each slot is equal to the number of PUSCH symbols in each slot. In addition, the number of OCC blocks included in each repetitive transmission block can be determined based on the repetition factor and the sequence length of the slot-based OCC. For example, the number of OCC blocks included in each repetitive transmission block can be determined based on the result of dividing the repetition factor by the number corresponding to the sequence length of the slot-based OCC. At this time, if the OCC block allocation method is a hopping method, the interval for hopping can be determined on a slot-by-slot basis.

[0223] Figures 23 to 25 illustrate examples of OCC block allocation within a repetitive transmission block for a single UE in a wireless communication system according to an embodiment of the present disclosure. Here, different patterns represent different OCC blocks, and w l represents the lth element of the OCC sequence applied to each OCC block. At this time, the position of the element of each OCC sequence can be applied with the same cyclic shift for all UEs. In addition, the slots illustrated in FIGS. 23 to 25 represent symbols repeatedly transmitted in each slot, and these can be soft combined after OCC despreading even if they belong to different OCC blocks.

[0224] FIG. 23 illustrates examples of OCC block allocation schemes when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure. FIG. 23 shows examples of OCC block allocation schemes within a repeated transmission block when the repetition factor is 8. Referring to FIG. 23, case a represents sequential allocation, and case b represents hopping allocation with an interval of 2. In the sequential scheme, when slot-based OCC with a sequence length of 2 is applied, OCC blocks of length 2 may be sequentially allocated. Alternatively, when slot-based OCC with a sequence length of 4 is applied, OCC blocks of length 4 may be sequentially allocated. In the hopping scheme, when slot-based OCC with a sequence length of 2 is applied, each component of OCC blocks of length 2 may be allocated to have an interval of 2. Alternatively, when a slot-based OCC with a sequence length of 4 is applied, each component of the OCC blocks of length 4 can be allocated to have an interval of 2.

[0225] FIG. 24 illustrates other examples of OCC block allocation methods when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to an embodiment of the present disclosure. FIG. 24 shows an OCC block allocation method within a repeated transmission block when a repetition factor is 16 and a slot-based OCC sequence has a length of 2. Referring to FIG. 24, in the case of the sequential method of case a), OCC blocks of length 2 may be sequentially allocated. In the case of the hopping method with an interval of 2 of case b), each component of the OCC blocks of length 2 may be allocated to have an interval of 2. In the case of the hopping method with an interval of 8 of case c), each component of the OCC blocks of length 2 may be allocated to have an interval of 8.

[0226] FIG. 25 illustrates further examples of an OCC block allocation method when a slot-based OCC is applied to a PUSCH repetition type A in a wireless communication system according to an embodiment of the present disclosure. FIG. 25 shows an OCC block allocation method within a repeated transmission block when a repetition factor is 16 and a slot-based OCC sequence has a length of 4. Referring to FIG. 25, in the case of the sequential method of case a), OCC blocks of length 4 may be sequentially allocated. In the case of the hopping method with an interval of 2 of case b), each component of the OCC blocks of length 4 may be allocated to have an interval of 2. In the case of the hopping method with an interval of 8 of case c), each component of the OCC blocks of length 4 may be allocated to have an interval of 4.

[0227] For convenience of explanation in FIGS. 23 to 25, a fixed repetition factor is assumed. However, the present disclosure can be extended and applied in the same manner to repetition factors exceeding the aforementioned repetition factor value. For example, the example of FIG. 25 can be extended to a case where the repetition factor is 32. In this case, the OCC block allocation method applied to slots 1 to 16 can be applied identically to slots 17 to 32. This can be similarly applied to other OCC block allocation methods described below.

[0228] The aforementioned FIGS. 23 to 25 illustrate OCC block allocation for individual UEs to symbols at specific locations within each slot. The OCC block allocation schemes of FIGS. 23 to 25 can be applied equally to all symbols in each slot included in a repetitive transmission block. Furthermore, different OCC block allocation schemes can be applied depending on each symbol location. For example, a mixed method, such as sequential and hopping methods, or hopping methods with different interval values, can also be applied. For example, as illustrated in FIGS. 26 and 27, a mixed method can be applied. In this case, the mixed method can be applied by performing allocation separately for each repeatedly transmitted symbol. For example, in the mixed method, the allocation for the first symbol and the allocation for the second symbol can be performed in separate, different ways.

[0229] FIG. 26 illustrates examples of OCC block allocation schemes when slot-based OCC is applied to PUSCH repetition type A in a wireless communication system according to one embodiment of the present disclosure. FIG. 26 is an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when the repetition factor is 8 and OCC is applied to two PUSCH symbols within each slot. Referring to FIG. 26, case a is an example in which OCC blocks are allocated based on a sequential manner, and case b is an example in which OCC blocks are allocated based on a hopping manner with an interval of 2. Case c is an example in which the first symbol of the OCC blocks is allocated based on a sequential manner, and the second symbol of the OCC blocks is allocated based on a hopping manner with an interval of 2.

[0230] FIG. 27 illustrates other examples of OCC block allocation schemes when slot-wise OCC is applied to PUSCH repetition type A in a wireless communication system according to an embodiment of the present disclosure. FIG. 26 illustrates examples of OCC block allocation schemes within repeated transmission blocks of individual UEs when the repetition factor is 8 and OCC is applied to 4 PUSCH symbols within each slot. Referring to FIG. 27, case a is an example in which OCC blocks are allocated based on a sequential manner, and case b is an example in which OCC blocks are allocated based on a hopping manner with an interval of 2. Case c is an example in which the first and second symbols of the OCC blocks are allocated based on a sequential manner, and the third and fourth symbols of the OCC blocks are allocated based on a hopping manner with an interval of 2.

[0231]

[0232] B) PUSCH repetition type B and symbol-level OCC

[0233] PUSCH Repetition Type B is a symbol-based repetitive transmission, where all symbols within a repetitive transmission interval are repeatedly transmitted as the same symbol. Therefore, both symbol-based OCC and slot-based OCC can be applied based on the repetition factor.

[0234] When performing symbol-level repetitive transmission, if symbol-level OCC is applied without slot-level OCC, the length of symbol-level OCC can be determined as a divisor of a repetition factor. In this case, the length of symbol-level OCC can be determined regardless of whether OCC is applied within a symbol. In addition, the length of OCC within a symbol can be determined regardless of the repetition factor. When symbol-level OCC is applied, if OCC blocks are allocated according to a hopping method, the interval for hopping can be determined on a symbol-by-symbol basis.

[0235] Figures 28 and 29 illustrate examples of OCC block allocation. In Figures 28 and 29, different patterns represent different OCC blocks, and w l represents the lth element of the OCC sequence applied to each OCC block. At this time, the positions of the elements of each OCC sequence can be applied with the same circular shift for all UEs. In addition, each of the square blocks, except for blocks without a pattern, is a symbol that is repeatedly transmitted identically, and can be soft-combined after despreading even when multiple OCC blocks are used.

[0236] FIG. 28 illustrates examples of allocation schemes for OCC blocks when symbol-level OCC is applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 28 is an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when the repetition factor is 16 and OCC is applied to 8 symbols within each slot. Referring to FIG. 28, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping manner with an interval of 4.

[0237] FIG. 29 illustrates other examples of allocation schemes for OCC blocks when symbol-level OCC is applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 29 illustrates an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when the repetition factor is 8 and OCC is applied to 6 symbols within each slot. Referring to FIG. 29, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping manner with an interval of 2.

[0238]

[0239] C) PUSCH repetition type B and slot-wise OCC

[0240] When performing symbol-based repetitive transmission, if slot-based OCC is applied without symbol-based OCC, the length of slot-based OCC may be determined as a divisor of the number of slots in which repetitive transmission is performed. In this case, the length of slot-based OCC may be determined regardless of whether OCC is applied within a symbol. Furthermore, the length of OCC within a symbol may be determined regardless of the repetition factor. When slot-based OCC is applied, at least one OCC block may be included within each slot. According to one embodiment, only one type of slot-based OCC may be applied. For example, only one OCC sequence length may be applied. In this case, as illustrated in FIGS. 30 and 31, the OCC sequence length may be a value obtained by dividing the repetition factor by the number of PUSCH symbols for repetition in a slot. For example, repetition factor / number of PUSCH symbols for repetition in a slot = OCC sequence length. Therefore, symbol-based repetitive transmission should start from the first PUSCH symbol of the first slot of the repetitive transmission block and end at the last PUSCH symbol of the slot of the repetitive transmission block. The first slot of the repetitive transmission block can be understood as the slot where the repetitive transmission block starts, and the last slot of the repetitive transmission block can be understood as the slot where the repetitive transmission block ends. At this time, if the OCC block allocation method is a hopping method, the interval for hopping can be determined in units of slots. FIG. 30 and FIG. 31 illustrate examples of cases where slot-based OCC is applied to PUSCH repetition type B. Here, different patterns represent different OCC blocks, and w lrepresents the lth element of the OCC sequence applied to each OCC block. At this time, the position of the element of each OCC sequence can be applied so that it is cyclically shifted equally for all UEs. In addition, each square block is a symbol that is repeatedly transmitted identically, and can be soft-combined after despreading even when multiple OCC blocks are used.

[0241] FIG. 30 illustrates examples of allocation schemes for OCC blocks when slot-based OCC is applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 30 illustrates examples of OCC block allocation schemes within repeated transmission blocks of individual UEs when the repetition factor is 8 and OCC is applied to two PUSCH symbols within each slot. Referring to FIG. 30, Case A is an example in which OCC blocks are allocated based on a sequential manner, and Case B is an example in which OCC blocks are allocated based on a hopping manner with an interval of 2.

[0242] FIG. 31 illustrates other examples of allocation methods of OCC blocks when slot-based OCC is applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 31 illustrates an example of an OCC block allocation method within a repeated transmission block of an individual UE when the repetition factor is 16 and OCC is applied to two PUSCH symbols within each slot. Referring to FIG. 31, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping manner with an interval of 2.

[0243]

[0244] D) PUSCH repetition type B and symbol-level OCC and slot-level OCC

[0245] When performing symbol-based repetitive transmission, if symbol-based OCC and slot-based OCC are applied, the length of symbol-based OCC can be determined as a divisor of a repetition factor. In addition, the length of slot-based OCC can be determined as a divisor of the number of slots in which repetitive transmission is performed. In this case, the length of symbol-based OCC and slot-based OCC can be determined regardless of whether OCC is applied within a symbol. In addition, the length of symbol-based OCC can be determined regardless of the repetition factor. When symbol-based OCC and slot-based OCC are applied, at least one OCC block can be included within each slot.

[0246] According to one embodiment, only one type of slot-based OCC can be applied. For example, only one OCC sequence length can be applied. In this case, the length of the slot-based OCC sequence can be determined by dividing the repetition factor by the number of PUSCH symbols for repetition in a slot. For example, repetition factor / number of PUSCH symbols for repetitions in a slot can be equal to the length of the slot-based OCC sequence (sequence length of OCC across slots). Therefore, symbol-based repeated transmission must start from the first PUSCH symbol of the first slot of the repeated transmission block and end at the last PUSCH symbol of the last slot of the repeated transmission block. Here, the first slot of the repeated transmission block can be understood as the slot where the repeated transmission block starts, and the last slot of the repeated transmission block can be understood as the slot where the repeated transmission block ends. In this case, if the OCC block allocation method is a hopping method, the interval for hopping can be determined for each symbol unit and each slot unit.

[0247] Figures 32 to 34 illustrate examples of cases where symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B. In Figures 32 to 34, different patterns represent different OCC blocks. is the lth element of the symbol unit OCC sequence applied to each OCC block, represents the lth element of the slot-based OCC sequence applied to each OCC block. At this time, the positions of the elements of each OCC sequence can be applied with the same circular shift for all UEs. In addition, each square block is composed of symbols that are repeatedly transmitted identically, and can be soft-combined after despreading even when multiple OCC blocks are used.

[0248] FIG. 32 illustrates examples of allocation schemes of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 32 is an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when a repetition factor is 16, OCC is applied to 4 PUSCH symbols within each slot, and the length of a symbol-based OCC sequence is 4 and the length of a slot-based OCC sequence is 2. Referring to FIG. 32, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping manner in which the interval for a symbol-based OCC is 0 PUSCH symbol and the interval for a slot-based OCC is 2 slots.

[0249] FIG. 33 illustrates other examples of allocation schemes of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 33 is an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when a repetition factor is 16, OCC is applied to 4 PUSCH symbols in each slot, and the length of a symbol-based OCC sequence is 2 and the length of a slot-based OCC sequence is 4. Referring to FIG. 33, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping manner in which the interval for symbol-based OCC is 2 PUSCH symbols and the interval for slot-based OCC is 0 slot.

[0250] FIG. 34 illustrates further examples of allocation schemes of OCC blocks when symbol-based OCC and slot-based OCC are applied to PUSCH repetition type B in a wireless communication system according to an embodiment of the present disclosure. FIG. 34 illustrates an example of an OCC block allocation scheme within a repeated transmission block of an individual UE when a repetition factor is 16, OCC is applied to 4 PUSCH symbols in each slot, and the length of a symbol-based OCC sequence is 2 and the length of a slot-based OCC sequence is 2. Referring to FIG. 34, Case a is an example in which OCC blocks are allocated based on a sequential manner, and Case b is an example in which OCC blocks are allocated based on a hopping scheme in which the interval for symbol-based OCC is 2 PUSCH symbols and the interval for slot-based OCC is 0 slot.

[0251]

[0252] Figure 35 illustrates an example of a procedure for transmitting information about an OCC in a wireless communication system according to one embodiment of the present disclosure. Figure 21 illustrates a method performed by a terminal. The terminal may be understood as a UE.

[0253] Referring to FIG. 35, in step S3501, the terminal receives first information related to the OCC. The terminal receives the first information related to the OCC through the first signaling of the base station. The first signaling may include at least one of cell-specific signaling (e.g., SIB), group-specific signaling, or UE-specific signaling (e.g., DCI, MAC CE, RRC message). The first information related to the OCC may include information necessary for setting the length of the OCC sequence. For example, the first information related to the OCC may include information that limits or indicates the range of the length of the OCC sequence.

[0254] In step S3503, the terminal receives second information related to the OCC. The terminal receives the second information related to the OCC through second signaling from the base station. The second signaling may include at least one of cell-specific signaling (e.g., SIB), group-specific signaling, or UE-specific signaling (e.g., DCI, MAC CE, RRC message). The second information related to the OCC may include information specifying the length of the OCC sequence. For example, the second information related to the OCC may include at least one of information indicating a specific value within a range for the length of the OCC sequence or information indicating a value of the OCC sequence.

[0255] In the embodiment described with reference to FIG. 35, the terminal has been described as an example in which the first information and the second information are information regarding the length of an OCC sequence. However, the first information and the second information are not limited thereto. For example, the first information and / or the second information may include at least one of information regarding the OCC technique to be applied or information regarding the interval for OCC block allocation.

[0256]

[0257] 3) Signaling information

[0258] For the OCC application method as described above and for OCC block allocation within a repetitive transmission block, values ​​for at least the following information must be defined through signaling or standard specifications.

[0259] - Applied OCC techniques (e.g., whether each OCC technique is applicable)

[0260] - OCC sequence length by applied OCC technique

[0261] - OCC sequence ID of each UE for each applied OCC technique

[0262] - Interval when allocating OCC blocks

[0263] The above information can be simultaneously transmitted to multiple terminals via cell-specific signaling such as SIB or group-specific signaling. For example, the base station can transmit the common OCC block allocation interval in a specific cell, the common applied OCC method, and / or the OCC sequence length, etc. to multiple terminals. Alternatively, the above information can be transmitted to individual terminals via UE-specific signaling such as DCI (Downlink Control Information), MAC CE, or RRC message. For example, the base station can individually transmit the UE-specific applied OCC method, OCC sequence length, OCC sequence ID, OCC block allocation interval, etc. to all terminals. Alternatively, at least one of the above-described information can be transmitted via a combination of cell-specific signaling, group-specific signaling, or UE-specific signaling. Specifically, the range of assignable values ​​for OCC block allocation interval, applicable OCC method, and / or OCC sequence length may be limited through cell-specific signaling, and specific values ​​within the limited range may be conveyed through group-specific signaling or UE-specific signaling. For example, after a range indicator for OCC sequence length according to repetition factor is conveyed through cell-specific signaling, specific values ​​within the range may be conveyed through group-specific signaling or UE-specific signaling. Alternatively, at least some information may use values ​​defined in the standard without separate signaling. For example, the OCC block allocation interval may be fixed and applied in a sequential manner (e.g., interval 1), or may be fixed and applied as [repetition factor] / [total OCC sequence length excluding OCC within symbol].

[0264]

[0265] Next, we describe the overhead of specific signaling information for the information listed above.

[0266] First, let's explain the OCC sequence ID. The OCC sequence length is In this case, the maximum number of orthogonal sequences is There may be a dog, so for one transmission You can use bits. At this time, silver Indicates the smallest integer not smaller than . In addition, when performing PUSCH transmission using multiple OCC techniques simultaneously, for each OCC technique, Each bit can be used individually. For example, when applying intra-symbol OCC and symbol-level OCC simultaneously, for each OCC technique Each bit can be used. Information related to the sequence ID generated in this way can be simultaneously transmitted to UEs with a common sequence ID through cell-specific signaling and / or group signaling. Alternatively, it can be transmitted separately to individual UEs through cell-specific signaling. When a separate sequence ID is used for each PUSCH symbol, such as in PUSCH repetition type A, signaling for each sequence ID is required.

[0267] Next, we describe the interval for OCC block allocation in repeated transmission. The candidate set of available intervals defined in the standard is For individuals, for one transfer Bits may be used. In this case, the candidate range of available intervals defined in the specification may be separately defined based on at least one of the sequence length, repetition factor, or PUSCH repetition type. Information about the intervals generated in this way may be simultaneously transmitted to multiple UEs having a common OCC block allocation interval through cell-specific signaling and / or group-specific signaling, or may be separately transmitted to individual UEs through UE-specific signaling. Alternatively, after information limiting the number of cases of OCC block allocation intervals is transmitted through cell-specific signaling and / or group-specific signaling, a specific value corresponding to one of the limited ranges may be transmitted through group-specific signaling and / or UE-specific signaling. In addition, a fixed allocation interval may be used without signaling. For example, a sequential method with an interval of 1 may always be applied. Alternatively, a method of determining the interval without signaling may be used using a table or function defined based on at least one of the sequence ID, sequence length, repetition factor, or PUSCH repetition type. For example, a fixed value of [repetition factor] / [total OCC sequence length excluding OCC within a symbol] can be used. In case of using a separate interval for each PUSCH symbol in PUSCH repetition type A, signaling for each interval is required.

[0268] Next, we explain the applicability of each OCC technique and the OCC sequence. This can be broadly categorized into the following three cases.

[0269] A) If only one OCC technique is defined in the standard specification.

[0270] If only one OCC technique is defined in the standard, the signaling of whether the OCC technique is applied can be replaced by the signaling of the OCC sequence length. Therefore, the maximum OCC sequence length is In this case, the maximum for one transmission is can be transmitted using bits. The OCC sequence length is a power of 2 (e.g. ), information about the OCC sequence length is at most It can be transmitted through 2 bits. In this case, if the OCC sequence length is 1, it is interpreted as a case where the corresponding OCC technique is not applied to PUSCH transmission, and if the OCC sequence length is 2 or more, it can be interpreted and applied as application of the OCC technique to PUSCH transmission. For example, if OCC sequence lengths of 1, 2, and / or 4 are available, information about the OCC sequence length can be transmitted using 2 bits. In this case, if a field corresponding to an OCC sequence length of 1 is signaled, it can be interpreted as PUSCH transmission without applying OCC.

[0271] Alternatively, if the OCC technique is defined to be used automatically only in certain situations, no signaling is required to indicate whether OCC is used. Therefore, the maximum signaling field for length 1 is excluded. The OCC sequence length can be transmitted using only bits. For example, if OCC is standardized to be used unconditionally in PUSCH repetition type A, PUSCH repetition type B, or a specific PUSCH transmission situation, the maximum The OCC sequence length can be transmitted using only one bit. If the OCC sequence length is a power of 2 (e.g. ), information about the OCC sequence length is at most can be transmitted using 1 bit. For example, if OCC sequence lengths of 1, 2, and / or 4 are available, an OCC sequence length of 2 or 4 can be transmitted using 1 bit.

[0272]

[0273] B) When multiple OCC techniques are defined in the standard specification and only one OCC technique can be applied during PUSCH transmission.

[0274] In a situation where multiple OCC techniques are defined in the standard and only one OCC technique can be applied during PUSCH transmission, if the OCC technique to be used for each situation is defined in the standard, signaling to indicate the OCC technique to be applied is not required. For example, if it is standardized to use a specific OCC technique for PUSCH repetition type A, PUSCH repetition type B, or a given PUSCH transmission situation, signaling to indicate the OCC technique to be used is not required. Therefore, the maximum OCC sequence length of the corresponding OCC technique is In this case, the maximum is excluding the signaling field for length 1. Information about the OCC sequence length can be transmitted using only one bit. If the OCC sequence length is a power of 2 (e.g. ) is determined only by the maximum The OCC sequence length can be transmitted using one bit. For example, if OCC sequence lengths of 1, 2, and 4 are available, an OCC sequence length of 2 or 4 can be transmitted using one bit.

[0275] Additionally, in the aforementioned cases, the standard may define the OCC sequence length to be used to be determined by calculation or table without signaling for each situation (e.g., by repetition type and / or repetition factor). In this case, separate signaling for the OCC sequence length is not required.

[0276] Conversely, if different OCC techniques can be applied each time or over time for the same PUSCH transmission environment, such as the same PUSCH repetition type, number of PUSCH symbols per slot, or repetition factor, based on the judgment of the base station and / or the network, signaling is required regarding whether OCC is applied, the OCC technique currently being used, and the OCC sequence length. This information may be signaled individually or combined. Combined signaling of information may include signaling the information by merging, integrating, or fusion.

[0277] - The specific cases where each piece of information is signaled individually are as follows. First, whether OCC is applied can be indicated by 1-bit signaling information indicating OCC application or OCC non-application. At this time, if the number of OCC techniques defined in the standard is 2, information on the OCC technique currently to be used can be indicated by 1-bit signaling information. For example, if only 2 OCC techniques among symbol-specific OCC, symbol-level OCC, and slot-level OCC are defined in the standard, information on the OCC technique to be applied can be indicated by 1-bit signaling information. If the number of OCC techniques defined in the standard is 3, information on the OCC technique currently to be used can be indicated by 2-bit signaling information. In addition, if the total length of the available OCC sequence is K, information on the OCC sequence length bits may be used. Alternatively, if an OCC sequence length of 2 or 4 is available, it may be represented as 1-bit signaling information. Therefore, when the OCC sequence length is 2 or 4, if each piece of information is signaled individually, a total of 3 or 4 bits of signaling may be required for a single transmission of information. For example, if two OCC techniques are defined in the standard, the OCC sequence length is 2 or 4, and each piece of information is signaled individually, a total of 3 bits of signaling may be required. On the other hand, if three OCC techniques are defined in the standard, the OCC sequence length is 2 or 4, and each piece of information is signaled individually, a total of 4 bits of signaling may be required.

[0278] - The cases where information is combined and signaled are specifically as follows. When a sequence length of 2 or 4 is available and two OCC techniques are defined in the standard, 5-state information can be signaled using 3 bits. For example, 5-state information can include at least one of using technique A and length 2, using technique A and length 4, using technique B and length 2, using technique B and length 4, or not used. Alternatively, when a sequence length of 4 is available and four OCC techniques are defined in the standard, 5-state information can be signaled using 3 bits. For example, 7-state information can include at least one of using technique A and length 2, using technique A and length 4, using technique B and length 2, using technique B and length 4, using technique C and length 2, using technique C and length 4, or not used.

[0279] Therefore, when the available OCC sequence lengths are 2 and 4, a total of 3 bits of signaling may be required for one transmission of information, regardless of the number of OCC techniques defined in the standard, if all information is combined and signaled. A total of 3 bits for each technique If two OCC sequences are available and two OCC techniques are defined in the standard, (2K+1)-state information must be signaled, so for a single information transfer Signaling of bits may be required. For each technique, a total of If 3 OCC sequences are available and 3 OCC techniques are defined in the standard, (3K+1)-state information must be signaled, so for a single information transfer Signaling of bits may be required.

[0280] - If the application of the OCC technique is defined in the standard to be automatically applied depending on the repetition type, or if only the corresponding information is signaled separately and cell-specifically, the OCC technique to be used and the OCC sequence length may be combined and transmitted. In this case, if a sequence length of 2 or 4 is available and two OCC techniques are defined in the standard, 4-state information may be signaled using 2 bits. For example, the 4-state information may include at least one of the following: use of technique A and length 2, use of technique A and length 4, use of technique B and length 2, or use of technique B and length 4. If a sequence length of 2 or 4 is available and three OCC techniques are defined in the standard, 6-state information may be signaled using 3 bits. For example, the 6-state information may include at least one of the following: use of technique A and length 2, use of technique A and length 4, use of technique B and length 2, use of technique B and length 4, use of technique C and length 2, or use of technique C and length 4. Therefore, when the available OCC sequence length is 2 or 4, and the OCC technique to be used and the OCC sequence length are combined and signaled, a total of 2 or 3 bits of signaling may be required for one transmission of information, excluding the overhead of whether or not OCC is applied. For example, if 2 OCCs are defined in the standard, 2 bits of signaling may be required for one transmission of information, and if 3 OCCs are defined in the standard, 3 bits of signaling may be required for one transmission of information. The total available OCC sequence length for each technique is If two OCC techniques are defined in the standard, 2K-state information must be signaled, so for one information transfer Bit signaling may be required. The total length of the OCC sequence available for each technique is If there are three OCC techniques defined in the standard, 3K-state information must be signaled, so for one information transfer Signaling of bits may be required.

[0281]

[0282] C) When multiple OCC techniques are defined in the standard specification and multiple OCC techniques can be applied during PUSCH transmission.

[0283] In a situation where multiple OCC techniques are defined in the standard and multiple OCC techniques can be applied during PUSCH transmission, if the OCC technique to be used for each situation is defined in the standard, signaling to indicate the OCC technique to be applied is not necessary. For example, if it is standardized to use a specific OCC technique for PUSCH repetition type A, PUSCH repetition type B, or a given PUSCH transmission situation, signaling to indicate the OCC technique to be used is not necessary. Therefore, the maximum OCC sequence length of each OCC technique is In this case, excluding the signaling field for length 1, the maximum Information about the length of one OCC sequence can be transmitted using only one bit. If the OCC sequence length is a power of 2 (e.g. ) is determined only by the maximum Through the bits, one OCC sequence length can be transmitted. For example, if OCC sequence lengths of 1, 2, and 4 are available, an OCC sequence length of 2 or 4 can be transmitted using 1 bit. Therefore, for signaling the OCC sequence length, up to may require up to 3 bits. For example, if OCC sequence lengths of 1, 2, and 4 are available and up to 3 OCC sequences are applied in combination, up to 3 bits of signaling may be required to signal the 3 OCC sequence lengths.

[0284] Additionally, in the aforementioned cases, the standard may define that the OCC sequence length is determined by calculation or table without signaling for each situation (e.g., by repetition type and / or by repetition factor). In this case, separate signaling for the OCC sequence length is not required.

[0285] Conversely, if different OCC techniques are applicable to the same PUSCH transmission environment, such as the same PUSCH repetition type, number of PUSCH symbols per slot, repetition factor, etc., based on the judgment of the base station and / or network, signaling regarding the applicability of each OCC technique and the OCC sequence length is required. This information may be signaled individually or combined.

[0286] - The specific cases where each piece of information is signaled individually are as follows:

[0287] First, whether each OCC technique is applied can be indicated by 1-bit signaling information indicating whether it is applied or not. If an OCC sequence length of 2 or 4 is available, the OCC sequence length can be indicated by 1-bit signaling information. Therefore, if the available OCC sequence length is 2 or 4 and each piece of information is signaled individually, a total of 4 bits (2x2 bits) or 6 bits (3x2 bits) of signaling may be required for a single transmission of information. For example, if the available OCC sequence length is 2 or 4 and two OCC techniques are defined in the standard, a total of 4 bits of signaling may be required. On the other hand, if the available OCC sequence length is 2 or 4 and four OCC techniques are defined in the standard, a total of 6 bits of signaling may be required. At this time, if the application of each OCC technique is defined in the standard to be automatically applied according to the repetition type, etc., or if only the relevant information is signaled separately and cell-specifically, only the OCC sequence length of each technique may be signaled. In this case, if the OCC sequence length is 2 or 4, a total of 2 bits (2x1 bit) or 3 bits (3x1 bit) of signaling may be required for one transmission of information. For example, if only two OCC techniques are defined in the standard, a total of 2 bits of signaling may be required. On the other hand, if all three OCC techniques are defined in the standard, a total of 3 bits of signaling may be required. In other words, a total of 2 bits for each technique For each technique, if the OCC sequence length of the dog is available, Signaling corresponding to bits can be used to convey only the OCC sequence length.

[0288] - In the case where information is combined and signaled, the information is signaled by each technique, and the application of each technique and the cases where the sequence lengths are combined are specifically as follows. A field corresponding to a sequence length of 1 can be assumed as a case where the technique is not applied. At this time, if an OCC sequence length of 2 or 4 is available, 3-state information can be expressed as signaling information using 2 bits. Therefore, if an OCC sequence length of 2 or 4 is available, a total of 4 bits (2x2 bits) or 6 bits (3x2 bits) of signaling may be required for one information transfer. For example, if an OCC sequence length of 2 or 4 is available and only two OCC techniques are defined in the standard, a total of 4 bits of signaling may be required for one information transfer. If an OCC sequence length of 2 or 4 is available and only two OCC techniques are defined in the standard, a total of 6 bits of signaling may be required for one information transfer. A total of 1 for each technique For each technique, if the OCC sequence length of the dog is available, Signaling corresponding to bits can be used to convey only the OCC sequence length.

[0289] - In cases where information is combined and signaled, the specific cases where all necessary information is combined and transmitted are as follows. First, when using OCC, the combination of OCC sequence lengths for all available OCC techniques is determined. If a state that does not use OCC is added, all available states can be indicated through signaling.

[0290] *For example, (1) if all three OCC techniques are defined in the standard, (2) the sequence length of each OCC technique is 2 or 4, and (3) the maximum number of multiplexed UEs when the OCC technique is applied repeatedly is 8, then there are a total of 16 combinations of OCC sequence lengths of all OCC techniques available when using OCC, as shown in [Table 11]. If the state of not using OCC is added here, all available states correspond to a total of 17-state information, so a single transmission of information can be performed through 5 bits of signaling. If the use of OCC is defined in the standard to be automatically applied during repeated transmission or only that information is signaled separately and cell-specifically, the total information to be transmitted becomes 16-state information. Therefore, a single transmission of information can be performed through 4 bits of signaling.

[0291] * Alternatively, (1) if all three OCC techniques are defined in the standard, (2) the sequence length of each OCC technique is 2 or 4, (3) the maximum number of multiplexed UEs when the OCC techniques are applied multiple times is 8, and (4) if the maximum number of OCC techniques that can be applied simultaneously is 2, the case where all three techniques are applied with OCC sequence length 2 can be excluded. Therefore, if a state that does not use OCC is added, the total number of available states becomes 16-state information, so that one information transfer can be performed through 4-bit signaling.

[0292] * Also, (1) if only two OCC techniques are both defined in the standard, (2) the sequence length of each OCC technique is 2 or 4, and (3) the maximum number of multiplexed UEs when the OCC techniques are applied in duplicate is 8, then there are a total of 7 combinations of OCC sequence lengths of all available OCC techniques when using OCC. For example, the 7 combinations, i.e., 7-state information, can include technique A and length 2, technique A and length 4, technique B and length 2, technique B and length 4, technique A and length 2 + technique B and length 2, technique A and length 2 + technique B and length 4, technique A and length 4 + technique B and length 2. Therefore, when a state that does not use OCC is added, all states become a total of 8-state information, so that information can be transferred once through 3-bit signaling.

[0293]

[0294] The methods according to the present disclosure may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either singly or in combination. The program instructions recorded on the computer-readable medium may be those specifically designed and configured for the present disclosure or may be known and available to those skilled in the computer software art.

[0295] Examples of computer-readable media include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0296] 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.

[0297] 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 this disclosure. The field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in this disclosure. In general, the methods are preferably performed by some hardware device.

[0298] Although the present disclosure has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. In a method of operating a terminal in a wireless communication system, Receiving DCI (downlink control information) including UL (uplink) grant; Generating symbols containing data based on the above DCI; Applying an orthogonal covering code (OCC) to signals included in a plurality of slots including the above symbols; and Including transmitting the above signals, The above OCC is applied using the OCC sequence assigned to the terminal, A method wherein the DCI includes at least one of information about the length of the OCC sequence or information indicating a value of the OCC sequence.

2. In claim 1, The above signals form at least one repetitive transmission block for repetitive transmission, A method wherein the length of the above OCC sequence is determined based on a repetition factor of the above repeated transmission.

3. In claim 1, A method wherein the OCC sequence length has a value less than or equal to the repetition factor.

4. In claim 1, The above OCC is applied based on the hopping method, A method wherein the product of the OCC sequence length and the hopping interval has a value less than or equal to the repetition factor.

5. In claim 1, The above signals form at least one repetitive transmission block for repetitive transmission, The above repeating transmission block includes at least one OCC block, A method wherein the number of at least one OCC block included in the above repeated transmission block is determined based on the length of the OCC sequence and the repetition factor.

6. In claim 1, The above OCC is a method including a slot unit OCC.

7. In claim 6, A method wherein the number of symbols for repeated transmission included in each of the plurality of slots is determined based on the length of the OCC sequence and the repetition factor.

8. In claim 1, At least one OCC technique to be applied to the above signals is determined based on the PUSCH (physical uplink shared channel) repetition type, A method wherein the at least one OCC technique comprises at least one of intra-symbol OCC, symbol-wise OCC, or slot-wise OCC.

9. In claim 1, A method further comprising receiving information related to setting of the OCC sequence through first signaling.

10. In claim 9, A method in which information related to the above OCC sequence setting includes information indicating the range of the OCC sequence.

11. In claim 1, Further comprising receiving at least one of information on whether the OCC is applied, information on at least one OCC technique to be applied, or OCC block allocation interval information. A method wherein said at least one piece of information is received via at least one of cell-specific signaling, group-specific signaling, or UE-specific signaling.

12. In claim 11, The number of bits used to indicate information about the length of the above OCC sequence is: A method, wherein the method is determined based on at least one of the number of defined OCC techniques, the number of OCC techniques to be applied, or the maximum length of available OCC sequences.

13. In a method of operating a NTN (non-terrestrial network) base station in a wireless communication system, Transmitting DCI (downlink control information) including UL (uplink) grant; and comprising receiving signals transmitted from multiple slots, The above signals are included in a plurality of slots containing symbols containing data, and an orthogonal covering code (OCC) is applied. The above OCC is applied using the OCC sequence assigned to the terminal, A method wherein the DCI includes at least one of information about the length of the OCC sequence and information indicating a value of the OCC sequence.

14. In claim 13, The above signals form at least one repetitive transmission block for repetitive transmission, A method wherein the length of the above OCC sequence is determined based on a repetition factor of the above repeated transmission.

15. In claim 13, A method wherein the OCC sequence length has a value less than or equal to the repetition factor.

16. In claim 13, A method further comprising transmitting information related to setting of the OCC sequence via first signaling.

17. In claim 13, Further comprising transmitting at least one of information on whether the OCC is applied, information on at least one OCC technique to be applied, or OCC block allocation interval information. A method wherein the at least one piece of information is transmitted via at least one of cell-specific signaling, group-specific signaling, or UE-specific signaling.

18. In claim 13, The number of bits used to indicate information about the length of the above OCC sequence is: A method, wherein the method is determined based on at least one of the number of defined OCC techniques, the number of OCC techniques to be applied, or the maximum length of available OCC sequences.

19. In a wireless communication system, at a terminal, At least one transmitter / receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed by said processor, control said terminal to perform operations; The above actions are, Receiving DCI (downlink control information) including UL (uplink) grant; Generating symbols containing data based on the above DCI; Applying an orthogonal covering code (OCC) to signals included in a plurality of slots including the above symbols; and Including transmitting the above signals, The above OCC is applied using the OCC sequence assigned to the terminal, A terminal in which the DCI includes at least one of information about the length of the OCC sequence or information indicating a value of the OCC sequence.

20. In a non-terrestrial network (NTN) base station in a wireless communication system, At least one transmitter / receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed by said processor, control said terminal to perform operations; The above actions are, Transmitting DCI (downlink control information) including UL (uplink) grant; and comprising receiving signals transmitted from multiple slots, The above signals are included in a plurality of slots containing symbols containing data, and an orthogonal covering code (OCC) is applied. The above OCC is applied using the OCC sequence assigned to the terminal, An NTN base station, wherein the DCI includes at least one of information on the length of the OCC sequence and information indicating the value of the OCC sequence.

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