Method and apparatus for uplink transmission and reception in wireless communication system

Abstract

Methods and apparatus for uplink transmission and reception in a wireless communication system are disclosed. A method according to one embodiment of the present disclosure may comprise the steps of: receiving configuration information from a base station, the configuration information providing information required for a UE to access a wireless communication system via an NTN including a satellite, the configuration information comprising first information on a UE-specific TA value and second information on a common TA; determining a TA value based on a UE-specific TA value given by the first information and a common TA value derived from the second information; and performing uplink transmission at a timing determined based on the TA value.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving an uplink channel / signal in the wireless communication system. Background Art

[0002] A mobile communication system has been developed to provide voice services while ensuring user mobility. However, the mobile communication system has been extended to data services as well as voice services, and currently, the explosive growth of services has led to resource shortages, and users have demanded faster services, thus requiring more advanced mobile communication systems.

[0003] The overall requirements of the next generation mobile communication system should be able to support the accommodation of explosive data services, a significant increase in the transmission rate per user, the accommodation of a significantly increased number of connected devices, very low end-to-end latency and high energy efficiency. To this end, a variety of technologies such as dual connectivity, massive multiple-input multiple-output (massive MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking have been studied. Summary of the invention

[0004] Technical issues

[0005] A technical object of the present disclosure is to provide a method and apparatus for transmitting and receiving an uplink channel / signal to access a wireless communication system through a non-terrestrial network (NTN) access.

[0006] In addition, an additional technical object of the present disclosure is to provide a method and apparatus configured for calculating a UE-specific timing advance (TA) value for NTN.

[0007] The technical objectives to be achieved by the present disclosure are not limited to the above-mentioned technical objectives, and those skilled in the art can clearly understand other technical objectives not described herein through the following description.

[0008] Technical Solution

[0009] According to one aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system may include the following steps: receiving configuration information from a base station, the configuration information providing information required for the UE to access the wireless communication system through a non-terrestrial network (NTN) including a satellite, wherein the configuration information includes first information for a UE-specific timing advance (TA) value and second information for a common TA; determining a TA value based on the UE-specific TA value given by the first information and a common TA value derived from the second information; and performing uplink transmission at a timing determined based on the TA value.

[0010] According to an additional aspect of the present disclosure, a method performed by a base station in a wireless communication system may include the following steps: sending configuration information to a user equipment (UE), the configuration information providing information required for the UE to access the wireless communication system through a non-terrestrial network (NTN) including a satellite, wherein the configuration information includes first information for a UE-specific timing advance (TA) value and second information for a common TA; and receiving an uplink transmission from the UE at a timing determined based on the TA value. The TA value may be determined based on the UE-specific TA value given by the first information and the common TA value derived from the second information.

[0011] Technical Effects

[0012] According to the embodiments of the present disclosure, it may be possible for the UE to calculate the TA value without always providing relevant information / parameters related to the serving satellite ephemeris (ie, high-level parameters related to the serving satellite ephemeris).

[0013] In addition, according to the embodiments of the present disclosure, since relevant information / parameters related to the serving satellite ephemeris (ie, high-level parameters related to the serving satellite ephemeris) are not always provided, signaling overhead can be reduced.

[0014] Effects achievable by the present disclosure are not limited to the above-described effects, and other effects not described herein may be clearly understood by those skilled in the art through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are included as a part of the detailed description for understanding the present disclosure, provide embodiments of the present disclosure and describe technical features of the present disclosure through the detailed description.

[0016] Figure 1 The structure of a wireless communication system to which the present disclosure can be applied is illustrated.

[0017] Figure 2 The frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0018] Figure 3 A resource grid in a wireless communication system to which the present disclosure can be applied is illustrated.

[0019] Figure 4 The physical resource blocks in a wireless communication system to which the present disclosure can be applied are illustrated.

[0020] Figure 5 The time slot structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0021] Figure 6Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0022] Figure 7 A non-terrestrial network to which the present disclosure may be applied is illustrated.

[0023] Figure 8 A cell of a non-terrestrial network to which the present disclosure can be applied is illustrated.

[0024] Fig. 9 The scheduling offset of a non-terrestrial network to which the present disclosure can be applied is illustrated.

[0025] Fig.10 A UE-specific TA and a common TA in a non-terrestrial network to which the present disclosure can be applied are illustrated.

[0026] Fig.11 is a diagram for illustrating orbital parameters in a non-terrestrial network to which the present disclosure may be applied.

[0027] Fig.12 The random access procedure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0028] Fig.13 A two-step random access procedure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0029] Fig.14 A signaling method for uplink transmission and reception methods according to one embodiment of the present disclosure is illustrated.

[0030] Fig.15 is a diagram illustrating an operation of a UE for an uplink transmission and reception method according to one embodiment of the present disclosure.

[0031] Fig.16 is a diagram illustrating an operation of a base station for an uplink transmission and reception method according to one embodiment of the present disclosure.

[0032] Fig.17 A block diagram of a wireless communication device according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed by the accompanying drawings is intended to describe exemplary embodiments of the present disclosure, rather than to represent the only embodiment in which the present disclosure can be implemented. The following detailed description includes specific details to provide a complete understanding of the present disclosure. However, those skilled in the relevant art know that the present disclosure can be implemented without these specific details.

[0034] In some cases, well-known structures and devices may be omitted, or may be shown in the form of a block diagram based on the core functions of each structure and device in order to prevent ambiguity in the concepts of the present disclosure.

[0035] In the present disclosure, when an element is referred to as being "connected", "combined" or "linked" to another element, it may include an indirect connection relationship between another element and a direct connection relationship. In addition, in the present disclosure, the term "comprising" or "having" specifies the presence of the mentioned features, steps, operations, components and / or elements, but does not exclude the presence or addition of one or more other features, stages, operations, components, elements and / or groups thereof.

[0036] In the present invention, terms such as "first", "second", etc. are only used to distinguish one element from another element and are not used to limit the elements, and unless otherwise specified, they do not limit the order or importance between the elements, etc. Therefore, within the scope of the present disclosure, the first element in an embodiment may be referred to as the second element in another embodiment, and similarly, the second element in an embodiment may be referred to as the first element in another embodiment.

[0037] The terms used in this disclosure are intended to describe specific embodiments, rather than to limit the claims. As used in the description of the embodiments and the appended claims, the singular form is intended to include the plural form, unless the context clearly indicates otherwise. The term "and / or" used in this disclosure may refer to one of the related enumerated items, or mean that it refers to and includes any and all possible combinations of two or more of them. In addition, unless otherwise stated, the " / " between words in the present invention has the same meaning as "and / or".

[0038] The present disclosure describes a wireless communication network or a wireless communication system, and operations performed in the wireless communication network may be performed in a process in which a device (e.g., a base station) controlling a corresponding wireless communication network controls the network and transmits or receives a signal, or may be performed in a process in which a terminal associated with the corresponding wireless network transmits or receives a signal between the network or the terminal.

[0039] In the present disclosure, sending or receiving a channel includes the meaning of sending or receiving information or signals through the corresponding channel. For example, sending a control channel means sending control information or control signals through the control channel. Similarly, sending a data channel means sending data information or data signals through the data channel.

[0040] In the following, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be expressed as a first communication device, and the terminal may be expressed as a second communication device. The base station (BS) may be replaced by terms such as a fixed station, a node B, an eNB (evolved node B), a gNB (next generation node B), a BTS (base station transceiver system), an access point (AP), a network (5G network), an AI (artificial intelligence) system / module, an RSU (roadside unit), a robot, a drone (UAV: unmanned aerial vehicle), an AR (augmented reality) device, a VR (virtual reality) device, and the like. In addition, the terminal can be fixed or mobile, and can be replaced by terms such as UE (user equipment), MS (mobile station), UT (user terminal), MSS (mobile subscriber station), SS (subscriber station), AMS (advanced mobile station), WT (wireless terminal), MTC (machine type communication) device, M2M (machine to machine) device, D2D (device to device) device, vehicle, RSU (roadside unit), robot, AI (artificial intelligence) module, drone (UAV: unmanned aerial vehicle), AR (augmented reality) device, VR (virtual reality) device, etc.

[0041] The following description can be used for various radio access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented by radio technologies such as GSM (Global System for Mobile Communications) / GPRS (General Packet Radio Service) / EDGE (Data Rate Enhanced GSM Evolution). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A pro is an advanced version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an advanced version of 3GPP LTE / LTE-A / LTE-A pro.

[0042] In order to make the description clearer, the description is based on the 3GPP communication system (e.g., LTE-A, NR), but the technical idea of ​​the present disclosure is not limited to this. LTE means the technology after 3GPP TS (Technical Specification) 36.xxx version 8. Specifically, the LTE technology in or after 3GPP TS 36.xxx version is called LTE-A, and the LTE technology in or after 3GPP TS 36.xxx version 13 is called LTE-Apro. 3GPP NR means the technology in or after TS 38.xxx version. LTE / NR can be referred to as a 3GPP system. "xxx" means the detailed number of the standard document. LTE / NR can generally be referred to as a 3GPP system. For the background technology, terms, abbreviations, etc. used to describe the present disclosure, reference can be made to the matters described in the standard documents disclosed before the present disclosure. For example, reference can be made to the following documents.

[0043] For 3GPP LTE, reference may be made to TS 36.211 (Physical Channels and Modulation), TS 36.212 (Multiplexing and Channel Coding), TS 36.213 (Physical Layer Procedures), TS 36.300 (Overall Description), and TS 36.331 (Radio Resource Control).

[0044] For 3GPP NR, you can refer to TS 38.211 (Physical channels and modulation), TS 38.212 (Multiplexing and channel coding), TS 38.213 (Physical layer procedures for control), TS 38.214 (Physical layer procedures for data), TS 38.300 (NR and NG-RAN (Next Generation Radio Access Network) overall description), and TS 38.331 (Radio Resource Control Protocol Specification).

[0045] Abbreviations of terms that may be used in the present disclosure are defined as follows.

[0046] -BM: Beam Management

[0047] -CQI: Channel Quality Indicator

[0048] -CRI: Channel State Information-Reference Signal Resource Indicator

[0049] -CSI: Channel State Information

[0050] -CSI-IM: Channel State Information-Interference Measurement

[0051] -CSI-RS: Channel State Information-Reference Signal

[0052] -DMRS: Demodulation Reference Signal

[0053] -FDM: Frequency Division Multiplexing

[0054] -FFT: Fast Fourier Transform

[0055] -IFDMA: Interleaved Frequency Division Multiple Access

[0056] -IFFT: Inverse Fast Fourier Transform

[0057] -L1-RSRP: Layer 1 reference signal received power

[0058] -L1-RSRQ: Layer 1 reference signal reception quality

[0059] -MAC: Media Access Control

[0060] -NZP: Non-Zero Power

[0061] -OFDM: Orthogonal Frequency Division Multiplexing

[0062] -PDCCH: Physical Downlink Control Channel

[0063] -PDSCH: Physical Downlink Shared Channel

[0064] -PMI: Precoding matrix indicator

[0065] -RE: Resource Element

[0066] -RI: Rank indicator

[0067] -RRC: Radio Resource Control

[0068] -RSSI: Received Signal Strength Indicator

[0069] -Rx: Receive

[0070] -QCL: Quasi-Co-located

[0071] -SINR: Signal to Interference and Noise Ratio

[0072] -SSB (or SS / PBCH block): synchronization signal block (including PSS (primary synchronization signal), SSS (secondary synchronization signal) and PBCH (physical broadcast channel))

[0073] -TDM: Time Division Multiplexing

[0074] -TRP: Transmit and Receive Point

[0075] -TRS: Tracking Reference Signal

[0076] -Tx: Send

[0077] -UE: User Equipment

[0078] -ZP: Zero Power

[0079] Overall system

[0080] As more communication devices require higher capacity, there has been a demand for improved mobile broadband communications compared to existing radio access technologies (RATs). In addition, large-scale MTC (machine type communication) that provides various services anytime and anywhere by connecting multiple devices and things is also one of the main issues to be considered in the next generation of communications. In addition, the design of communication systems considering services / terminals that are sensitive to reliability and latency is also discussed. Therefore, the introduction of next-generation RATs considering eMBB (enhanced mobile broadband communication), mMTC (massive MTC), URLLC (ultra-reliable low-latency communication), etc. is discussed, and for convenience, the corresponding technology is referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0081] The new RAT system including NR uses an OFDM transmission method or a transmission method similar thereto. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system follows the parameters of the existing LTE / LTE-A as is, but may support a wider system bandwidth (e.g., 100 MHz). Alternatively, a cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets may coexist in one cell.

[0082] A parameter set corresponds to one subcarrier spacing in the frequency domain. As the reference subcarrier spacing is scaled by an integer N, different parameter sets can be defined.

[0083] Figure 1 The structure of a wireless communication system to which the present disclosure can be applied is illustrated.

[0084] Reference Figure 1 , NG-RAN is configured with gNBs that provide the control plane (RRC) protocol side for the NG-RA (NG Radio Access) user plane (i.e., the new AS (Access Stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and the UE. The gNBs are interconnected through the Xn interface. In addition, the gNBs are connected to the NGC (Next Generation Core) through the NG interface. More specifically, the gNB is connected to the AMF (Access and Mobility Management Power) through the N2 interface, and to the UPF (User Plane Function) through the N3 interface.

[0085] Figure 2 The frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0086] The NR system may support multiple parameter sets. Here, the parameter set may be defined by subcarrier spacing and cyclic prefix (CP) overhead. Here, multiple subcarrier spacings may be derived by scaling the basic (reference) subcarrier spacing by an integer N (or, μ). In addition, although it is assumed that very low subcarrier spacings are not used in very high carrier frequencies, the parameter set used may be selected independently of the frequency band. In addition, various frame structures according to multiple parameter sets may be supported in the NR system.

[0087] In the following, OFDM parameter sets and frame structures that can be considered in the NR system will be described. Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1 below.

[0088] [Table 1]

[0089] μ <![CDATA[Δf=2 μ ·15[kHz]]]> CP 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0090] NR supports multiple parameter sets (or subcarrier spacing (SCS)) for supporting various 5G services. For example, when the SCS is 15kHz, it supports wide areas of traditional cellular bands; and when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency and wider carrier bandwidth; and when the SCS is 60kHz or higher, it supports bandwidths exceeding 24.25GHz to overcome phase noise.

[0091] The NR band is defined as two types of frequency ranges (FR1, FR2). FR1, FR2 can be configured as shown in Table 2 below. In addition, FR2 may mean millimeter wave (mmW).

[0092] [Table 2]

[0093] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz–7125MHz 15,30,60kHz FR2 24250MHz–52600MHz 60,120,240kHz

[0094] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed as T c =1 / (Δf max ·N f ) is a multiple of the time unit. Here, Δf max is 480·10 3Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) to have duration T f =1 / Δf max N f / 100)·T c =10ms radio frame. Here, the radio frame is configured with 10 subframes, each of which has T sf =(Δf max N f / 1000)·T c=1 ms duration. In this case, there may be one frame set for the uplink and one frame set for the downlink. Furthermore, the transmission in the i-th uplink frame from the terminal should start T earlier than the corresponding downlink frame in the corresponding terminal. TA =(N TA +N TA,offset )T c For subcarrier spacing configuration μ, the time slots are arranged in n subframes. s μ ∈{0,...,N slot subframe,μ -1} and in the radio frame the number is incremented by n s,f μ ∈{0,...,N slot frame,μ -1}. A time slot is configured with N symb slot consecutive OFDM symbols, and N symb slot Determined according to CP. Time slot n in a subframe s μ The beginning of the OFDM symbol n in the same subframe s μ N symb slot All terminals may not perform transmission and reception at the same time, which means that all OFDM symbols of a downlink time slot or an uplink time slot may not be used.

[0095] Table 3 shows the number of OFDM symbols per time slot in a normal CP (N symb slot ), the number of time slots per radio frame (N slot frame,μ ) and the number of time slots per subframe (N slot subframe,μ ), and Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0096] [Table 3]

[0097] μ <![CDATA[N symb slot ]]> <![CDATA[N slot frame,μ ]]> <![CDATA[N slot subframe,μ ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0098] [Table 4]

[0099] μ <![CDATA[N symb slot ]]> <![CDATA[N slot frame,μ ]]> <![CDATA[N slot subframe,μ ]]> 2 12 40 4

[0100] Figure 2 is an example of μ=2 (SCS is 60kHz), see Table 3, 1 subframe can include 4 time slots. Figure 21 subframe={1,2,4} shown in is an example, and the number of slots that may be included in 1 subframe is as defined in Table 3 or Table 4. In addition, a mini-slot may include 2, 4, or 7 symbols or more or less symbols.

[0101] Regarding the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. Hereinafter, the physical resources that can be considered in the NR system will be described in detail.

[0102] First, with respect to antenna ports, the antenna ports are defined so that the channel carrying the symbol in the antenna port can be inferred from the channel carrying the other symbol in the same antenna port. When the large-scale properties of the channel on which the symbol in one antenna port is carried can be inferred from the channel carrying the symbol of another antenna port, it can be said that the two antenna ports are in a QC / QCL (quasi-co-located or quasi-co-located) relationship. In this case, the large-scale properties include at least one of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0103] Figure 3 A resource grid in a wireless communication system to which the present disclosure can be applied is illustrated.

[0104] refer to Figure 3 , exemplarily describing a resource grid configuration with N in the frequency domain RB μ N sc RB subcarriers, and one subframe is configured with 14·2 μ OFDM symbols, but not limited to this. In the NR system, the transmitted signal consists of 2 μ N symb (μ) OFDM symbols and N RB μ N sc RB Here, N RB μ ≤N RB max,μ . N RB max,μ represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid can be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, k = 0, ..., N RB μ N sc RB-1 is the index in the frequency domain, and l'=0,...,2 μ N symb (μ) -1 refers to the symbol position in the subframe. When referencing a resource element in a slot, an index pair (k, l) is used. Here, l = 0, ..., N symb μ -1. The resource element (k, l') for μ and antenna port p corresponds to the complex value a k,l' (p,μ) When there is no risk of aliasing or when no specific antenna port or parameter set is specified, the indices p and μ may be dropped and the complex value may be ak,l'(p) or ak,l'. In addition, a resource block (RB) is defined as N in the frequency domain. sc RB =12 consecutive subcarriers.

[0105] Point A serves as a common reference point for the resource block grid and is obtained as follows.

[0106] -OffsetToPointA for the primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block, which is used by the terminal for initial cell selection. Assuming a subcarrier spacing of 15kHz is used for FR1 and a subcarrier spacing of 60kHz is used for FR2, it is expressed in resource blocks.

[0107] -absoluteFrequencyPointA represents the frequency position of point A, expressed in ARFCN (Absolute Radio Frequency Channel Number).

[0108] For subcarrier spacing configuration μ, the common resource blocks are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point A". Common resource block number n for subcarrier spacing configuration μ in the frequency domain CRB μ The relationship between and resource element (k, l) is given as in Equation 1 below.

[0109] [Formula 1]

[0110]

[0111] In Equation 1, k is defined relative to point A, so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are spaced from 0 to N in a bandwidth part (BWP). BWP,i size,μ -1 numbering and i is the number of the BWP. Physical resource block n in BWP i PRB and public resource block n CRBThe relationship between is given by the following equation 2.

[0112] [Formula 2]

[0113]

[0114] is the common resource block where the BWP starts relative to common resource block 0.

[0115] Figure 4 The physical resource blocks in the wireless communication system to which the present disclosure can be applied are illustrated. Figure 5 The time slot structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0116] Reference Figure 4 and Figure 5 , a time slot includes multiple symbols in the time domain. For example, for a normal CP, 1 time slot includes 7 symbols, but for an extended CP, 1 time slot includes 6 symbols

[0117] A carrier includes multiple subcarriers in the frequency domain. An RB (resource block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (bandwidth part) is defined as multiple consecutive (physical) resource blocks in the frequency domain and may correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication may be performed through an activated BWP, and only one BWP may be activated for a terminal. In a resource grid, each element is called a resource element (RE) and may map a complex symbol.

[0118] In the NR system, each component carrier (CC) can support up to 400MHz. If a terminal operating in such a wideband CC always operates to turn on the radio frequency (FR) chip for the entire CC, the terminal battery consumption may increase. Alternatively, when considering multiple application scenarios operating in a wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) can be supported in each frequency band in the corresponding CC. Alternatively, each terminal may have different capabilities for the maximum bandwidth. Taking this into account, the base station can instruct the terminal to operate only in part of the bandwidth instead of the full bandwidth of the wideband CC, and for convenience, the corresponding partial bandwidth is defined as a bandwidth part (BWP). BWP can be configured with continuous RBs on the frequency axis and can correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / microslot duration).

[0119] At the same time, even in one CC configured to the terminal, the base station can configure multiple BWPs. For example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring time slot, and the PDSCH indicated by the PDCCH can be scheduled in a larger BWP. Alternatively, when the UE is congested in a specific BWP, other BWPs can be configured for some terminals for load balancing. Alternatively, considering the frequency domain inter-cell interference elimination between adjacent cells, etc., some full-bandwidth intermediate spectrums can be excluded, and BWPs on two edges can be configured in the same time slot. In other words, the base station can configure at least one DL / UL BWP to a terminal associated with a broadband CC. The base station can activate at least one DL / UL BWP in the configured DL / UL BWP at a specific time (through L1 signaling or MAC CE (control element) or RRC signaling, etc.). In addition, the base station can indicate switching to other configured DL / UL BWPs (through L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, based on a timer, when the timer value expires, it can switch to a determined DL / UL BWP. Here, the activated DL / UL BWP is defined as the active DL / UL BWP. However, when the terminal performs the initial access procedure or sets up the RRC connection, the configuration on the DL / UL BWP may not be received, so the DL / UL BWP assumed by the terminal in these cases is defined as the initial active DL / UL BWP.

[0120] Figure 6 Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0121] In a wireless communication system, a terminal receives information from a base station through a downlink and transmits information to the base station through an uplink. The information sent and received by the base station and the terminal includes data and various control information, and there are various physical channels according to the type / purpose of the information they send and receive.

[0122] When the terminal is turned on or newly enters a cell, it performs an initial cell search including synchronization with a base station (S601). For the initial cell search, the terminal can synchronize with the base station by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station, and obtain information such as a cell identifier (ID). Then, the terminal can obtain broadcast information in the cell by receiving a physical broadcast channel (PBCH) from the base station. At the same time, the terminal can check the downlink channel status by receiving a downlink reference signal (DL RS) in the initial cell search phase.

[0123] The terminal that has completed the initial cell search may obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried in the PDCCH (S602).

[0124] At the same time, when the terminal accesses the base station for the first time or there are no radio resources for signal transmission, it can perform a random access (RACH) process (S603 to S606) on the base station. For the random access process, the terminal can send a specific sequence as a preamble code through a physical random access channel (PRACH) (S603 and S605), and can receive a response message to the preamble code through a PDCCH and a corresponding PDSCH (S604 and S606). The contention-based RACH can additionally perform a contention resolution process.

[0125] The terminal that subsequently performs the above process may perform PDCCH / PDSCH reception (S607) and PUSCH (Physical Uplink Shared Channel) / PUCCH (Physical Uplink Control Channel) transmission (S608) as a general uplink / downlink signal transmission process. Specifically, the terminal receives downlink control information (DCI) via PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and the format varies according to its purpose of use.

[0126] At the same time, the control information sent by the terminal to the base station through the uplink or received by the terminal from the base station includes downlink / uplink ACK / NACK (acknowledgement / non-acknowledgement) signal, CQI (channel instruction indicator), PMI (precoding matrix indicator), RI (rank indicator), etc. For the 3GPP LTE system, the terminal can send the above-mentioned CQI / PMI / RI and other control information through PUSCH and / or PUCCH.

[0127] Table 5 shows an example of the DCI format in the NR system.

[0128] [Table 5]

[0129]

[0130] Referring to Table 5, DCI formats 0_0, 0_1 and 0_2 may include resource information (e.g., UL / SUL (supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), information related to transport blocks (TBs) (e.g., MCS (modulation coding and scheme), NDI (new data indicator), RV (redundancy version)), etc.), information related to HARQ (hybrid-automatic repeat and request) (e.g., process number, DAI (downlink assignment index), PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information related to PUSCH scheduling (e.g., PUSCH power control, etc.), and the control information included in each DCI format may be predefined.

[0131] DCI format 0_0 is used to schedule PUSCH in one cell. Information included in DCI format 0_0 is CRC (Cyclic Redundancy Check) scrambled by C-RNTI (Cell Radio Network Temporary Identifier) ​​or CS-RNTI (Configured Scheduling RNTI) or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI) and transmitted.

[0132] DCI format 0_1 ​​is used to indicate the scheduling of one or more PUSCHs or to configure grant (CG) downlink feedback information to a terminal in a cell. The information included in DCI format 0_1 ​​is scrambled and transmitted by C-RNTI or CS-RNTI or SP-CSI-RNTI (semi-persistent CSIRNTI) or MCS-C-RNTI.

[0133] DCI format 0_2 is used to schedule PUSCH in one cell. Information included in DCI format 0_2 is scrambled and transmitted by C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.

[0134] Next, DCI formats 1_0, 1_1 and 1_2 may include resource information (e.g., frequency resource allocation, time resource allocation, VRB (virtual resource block) -PRB (physical resource block) mapping, etc.), information related to transport blocks (TBs) (e.g., MCS, NDI, RV, etc.), information related to HARQ (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., antenna ports, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), information related to PUCCH scheduling regarding PDSCH (e.g., PUCCH power control, PUCCH resource indicator, etc.), and the control information included in each DCI format may be predefined.

[0135] DCI format 1_0 is used to schedule PDSCH in one DL cell. Information included in DCI format 1_0 is CRC scrambled and transmitted by C-RNTI or CS-RNTI or MCS-C-RNTI.

[0136] DCI format 1_1 is used to schedule PDSCH in one cell. Information included in DCI format 1_1 is CRC scrambled and transmitted by C-RNTI or CS-RNTI or MCS-C-RNTI.

[0137] DCI format 1_2 is used to schedule PDSCH in one cell. Information included in DCI format 1_2 is CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0138] Non-Terrestrial Network (NTN) Operation

[0139] In order to ensure wider coverage or provide wireless communication services in places where it is not easy to install wireless communication base stations, the use of NR non-terrestrial network (NTN) or LTE NTN services is being considered. Although existing terrestrial network (TN) services such as NR and LTE services install base stations on the ground to provide wireless communication services to UEs, NTN services refer to providing wireless communication services to UEs by installing base stations at non-ground locations such as artificial satellites (geostationary orbit (GEO) satellites, low earth orbit (LEO) satellites, medium earth orbit (MEO) satellites, etc.), aircraft, unmanned aerial vehicles, and drones instead of installing base stations on the ground. Here, scenarios such as HAPS (high altitude platform) and ATG (air-to-ground) are also included.

[0140] (Rel-17 / 18) For NTN services, FDD is mainly considered (but TDD is not completely excluded), and it is assumed that the UE has Global Navigation Satellite System (GNSS) capability.

[0141] Figure 7 A non-terrestrial network to which the present disclosure may be applied is illustrated.

[0142] According to the characteristics of the payload of NTN platforms (especially satellites), it can be roughly divided into transparent payloads (see Figure 7 ) and regenerative payloads. In the case of transparent payloads, the satellite (or Unmanned Aircraft System (UAS) platform) performs roles such as RF filtering, frequency conversion, and amplification. As a result, the waveform signal of the transmitting payload is not changed.

[0143] On the other hand, for regenerative payloads, the satellite (or UAS platform) performs the roles of RF filtering, frequency conversion and amplification as well as demodulation / decoding, switching and / or routing, and encoding / modulation. Thus, all or part of the base station functionality may be considered to be onboard the satellite.

[0144] Figure 8 A cell of a non-terrestrial network to which the present disclosure can be applied is illustrated.

[0145] Reference Figure 8 , depending on the type of cells supported by the satellite, the cells can be divided into Figure 8 (a) Earth fixed cells and Figure 8 (b) Earth mobile cell. In the case of an earth fixed cell, this means that the cell is maintained in a specific position on the earth's surface (of the earth) permanently or within a specific service period based on the beam steering function of a satellite. In the case of an earth mobile cell, this means that the cell within the earth's surface continuously moves by utilizing a fixed beam service without using the beam steering function of a satellite.

[0146] As shown in Table 6, there may be different types of satellites (or UAS platforms).

[0147] Table 6 illustrates the types of NTN platforms.

[0148] [Table 6]

[0149]

[0150] Typically, GEO satellites and UAS are used to provide continental, regional or local services. In addition, LEO and MEO constellations are used to provide services in the northern and southern hemispheres. In some cases, constellations can even provide global coverage including polar regions. For the latter, this requires appropriate orbital inclination, sufficient beam generation and inter-satellite links.

[0151] Table 7 illustrates the reference scenario.

[0152] [Table 7]

[0153]

[0154] Table 8 illustrates reference scenario parameters.

[0155] [Table 8]

[0156]

[0157]

[0158] As mentioned above, in order to efficiently operate the smNTN with very long RTT, the scheduling offsets K_offset and K_mac are introduced. Fig. 9 The scheduling offset of a non-terrestrial network to which the present disclosure can be applied is illustrated.

[0159] K_offset refers to the offset value of the round trip time (RTT) of the uplink time synchronization reference point (RP). This means the sum of the service link RTT and the common TA (if indicated).

[0160] K_mac refers to the offset value of the RTT between the RP and the base station.

[0161] Fig.10 A UE-specific TA and a common TA in a non-terrestrial network to which the present disclosure can be applied are illustrated.

[0162] Reference Fig.10 In Rel-17 NTN, based on the UE's GNSS capability and base station indication information (e.g., ephemeris information), the UE can calculate the TA by itself, which is called the UE-specific TA. In addition, the TA calculated based on the common TA parameters indicated by the base station can be called the common TA, and the final TA is calculated based on this according to the provisions of TS 38.211.

[0163] The transmission in uplink frame number i from the UE must precede the start of the corresponding downlink frame from the UE by T TA =(N TA +N TA,offset +N TA,adj common +N TA,adj UE )T c start.

[0164] Here, N TA and N TA,offset Given by TS 38.213 section 4.2, except for msgA transmission on PUSCH (in this case, N TA =0).

[0165] In addition, N given by TS 38.213 Section 4.2 TA,adj common Derived from the higher-level parameters TACommon, TACommonDrift, and TACommonDriftVariation (if configured), otherwise N TA,adj common =0.

[0166] In addition, N given by TS 38.213 Section 4.2 TA,adjUE (if configured) is calculated by the UE based on higher-layer parameters related to the serving satellite ephemeris and the UE position, otherwise N TA,adj UE =0.

[0167] Two ephemeris formats are supported in 3GPP Rel-17, as follows:

[0168] i) Position and Velocity State Vector Ephemeris Format: It consists of a field for position (x, y, z) (m) and a field for velocity (vx, vy, vz) (m / s).

[0169] ii) Refer to the following Fig.11 Describes the orbital parameters ephemeris format.

[0170] Fig.11 is a diagram for illustrating orbital parameters in a non-terrestrial network to which the present disclosure may be applied.

[0171] Reference Fig.11 , orbital parameter ephemeris format is a method of expressing the orbit of a satellite using the following six elements.

[0172] i) Semi-major axis "a" [m]: Since the satellite orbit is elliptical, it represents half of the major axis in the elliptical orbit.

[0173] ii) Eccentricity "e": 0 for elliptical orbits <e<1。

[0174] iii) Argument of periapsis "ω" [rad] (1203): The angle from the periapsis (the point at which the object is closest to the orbital center) to the ascending node (1204), which determines the orientation of the ellipse in the orbital plane (1202).

[0175] iv) Longitude of ascending node "Ω" [rad] (1205): The ascending node (1204) is the point where the orbit passes from below the reference plane (1201) to above the reference plane (1201), and the angle measured counterclockwise from the reference point to the ascending node (1204) is called the longitude of the ascending node. In the solar system, the reference point is the vernal equinox.

[0176] v) Orbital inclination "i" [rad] (1206): It refers to the tilt of the ellipse relative to the reference plane (1201) and is measured as the angle between the orbital plane (1202) and the reference plane (1201) at the ascending node (the point where the orbit passes from below the reference plane (1201) to above it) (1204).

[0177] vi) Mean anomaly "M0" = M(t0) [rad] (at epoch time t0 [JD]): It is an angle that changes continuously with time, which is mathematically convenient, but the angle does not correspond to a geometric angle. The true anomaly "v" (1207) can also be used as this value, and the true anomaly represents the angle formed by the orbital pericenter and the orbiting object at any point in time, so the angle corresponds to the geometric angle.

[0178] In satellite-based communications, circular polarization is mainly used to increase the straightness of radio waves, and in Rel-17, system information block (SIB) signaling was introduced to the terminal to indicate what polarization information the satellite uses. The signaling polarization types include linear, right-hand circular polarization (RHCP), and left-hand circular polarization (LHCP).

[0179] Random access operation and related operations

[0180] When there are no PUSCH transmission resources (i.e., uplink grant) allocated by the base station, the terminal can perform a random access operation. Random access to the NR system can be initiated in the following situations: 1) when the terminal requests or resumes an RRC connection, 2) when the terminal performs a handover to a neighboring cell or a secondary cell group (SCG) addition (i.e., SCG addition), 3) when a scheduling request is sent to the base station, 4) when the base station instructs the terminal's random access with a PDCCH command, 5) when a beam failure or RRC connection failure is detected.

[0181] Fig.12 The random access procedure in a wireless communication system to which the present disclosure can be applied is illustrated. Fig.12 (a) of FIG. 1 illustrates a contention-based random access procedure, and Fig.12 (b) illustrates a dedicated random access procedure.

[0182] Reference Fig.12 (a) The contention-based random access procedure includes the following four steps. Hereinafter, the messages sent in steps 1 to 4 may be referred to as messages (Msg) 1 to Msg 4, respectively.

[0183] -Step 1: The terminal sends a random access channel (RACH) preamble through a physical random access channel (PRACH).

[0184] - Step 2: The terminal receives a random access response (RAR) from the base station through a downlink shared channel (DL-SCH).

[0185] -Step 3: The terminal sends a layer 2 / layer 3 message to the base station through an uplink shared channel (UL-SCH).

[0186] - Step 4: The terminal receives a contention resolution message from the base station via the DL-SCH.

[0187] The terminal may receive information about random access from the base station through system information.

[0188] If random access is required, the terminal transmits a RACH preamble to the base station as in step 1. The base station can distinguish each random access preamble by the time / frequency resource (ie, RACH opportunity (RO)) at which the random access preamble is transmitted and a random access preamble index (PI).

[0189] When the base station receives the random access preamble from the terminal, the base station sends a random access response (RAR) message to the terminal as in step 2. In order to receive the random access response message, within a preconfigured time window (e.g., ra-ResponseWindow), the terminal monitors the CRC mask L1 / L2 control channel (PDCCH) using RA-RNTI (Random Access-RNTI), which includes scheduling information for the random access response message. The PDCCH masked with RA-RNTI can be sent only through the common search space. When receiving a scheduling signal masked by RA-RNTI, the terminal can receive a random access response message from the PDSCH indicated by the scheduling information. Thereafter, the terminal checks whether there is random access response information indicated to itself in the random access response message. Whether the random access response information indicated to itself exists can be checked by whether the random access preamble ID (RAPID) of the preamble sent by the terminal exists. The index and RAPID of the preamble sent by the terminal can be the same. The random access response information includes the corresponding random access preamble code index, timing offset information for UL synchronization (e.g., timing advance command (TAC)), UL scheduling information for message 3 transmission (e.g., UL grant), and terminal temporary identification information (e.g., TC-RNTI (temporary C-RNTI)).

[0190] The terminal receiving the random access response information sends UL-SCH (shared channel) data (message 3) through PUSCH according to the UL scheduling information and the timing offset value, as in step 3. The time and frequency resources to which the PUSCH carrying message 3 is mapped / sent are defined as PO (PUSCH opportunity). Message 3 may include the ID of the terminal (or the global ID of the terminal). Alternatively, message 3 may include RRC connection request related information (e.g., RRCSetupRequest message) for initial access. In addition, message 3 may include a buffer status report (BSR) on the amount of data available for transmission by the terminal.

[0191] After receiving the UL-SCH data, as in step 4, the base station sends a contention resolution message (message 4) to the terminal. When the terminal receives the contention resolution message and successfully resolves the contention, the TC-RNTI is changed to the C-RNTI. Message 4 may include the ID of the terminal and / or RRC connection related information (e.g., RRCSetup message). If the information sent by message 3 and the information received by message 4 do not match, or if message 4 is not received within a specific duration, the terminal may retransmit message 3 due to contention resolution failure.

[0192] Reference Fig.12 (b), the dedicated random access procedure includes the following three steps. Hereinafter, the messages sent in step 0 to step 2 may be referred to as messages (Msg) 0 to Msg 2, respectively. The dedicated random access procedure may be triggered using a PDCCH (hereinafter referred to as a PDCCH command) instructing the base station to send a RACH preamble.

[0193] -Step 0: The base station allocates a RACH preamble code to the terminal through dedicated signaling.

[0194] -Step 1: The terminal sends a RACH preamble via PRACH.

[0195] - Step 2: The terminal receives a random access response (RAR) from the base station through the DL-SCH.

[0196] The operations of step 1 and step 2 of the dedicated random access procedure may be the same as steps 1 and step 2 of the contention-based random access procedure.

[0197] In NR, DCI format 1_0 is used to initiate a non-contention-based random access procedure with a PDCCH command. DCI format 1_0 is used to schedule PDSCH in one DL cell. In addition, when the CRC (cyclic redundancy check) of DCI format 1_0 is scrambled with C-RNTI and all bit values ​​of the "Frequency domain resource assignment" field are 1, DCI format 1_0 is used as a PDCCH command indicating a random access procedure. In this case, the fields of DCI format 1_0 are configured as follows.

[0198] -RA preamble index: 6 bits

[0199] -UL / SUL (Supplementary UL) indicator: 1 bit. When the bit values ​​of the RA preamble index are not all 0 and SUL is configured for the terminal in the cell, this indicates the UL carrier on which the PRACH is transmitted in the cell. Otherwise, it is reserved.

[0200] -SSB (Synchronization Signal / Physical Broadcast Channel) Index: 6 bits. When all bit values ​​of the RA preamble index are not 0, it indicates the SSB used to determine the RACH opportunity for PRACH transmission. Otherwise, it is reserved.

[0201] -PRACH Mask Index: 4 bits. When all bit values ​​of RA Preamble Index are not 0, it indicates the RACH opportunity associated with the SSB indicated by SSB Index. Otherwise, it is reserved.

[0202] - Reserved: 10 bits

[0203] When DCI format 1_0 does not correspond to a PDCCH command, DCI format 1_0 includes fields for scheduling PDSCH (eg, TDRA (Time Domain Resource Assignment), MCS (Modulation and Coding Scheme), HARQ process number, PDSCH-to-HARQ_feedback timing indicator, etc.).

[0204] In the NR system, lower latency may be required than in the existing system. In addition, if a random access process occurs in the U band, the random access process is terminated, and the contention is resolved only when LBT succeeds in sequence in all 4-step random access processes of the terminal and the base station. If LBT fails in even one step of the 4-step random access process, resource efficiency is reduced and latency is increased. Specifically, if LBT fails in the scheduling / transmission process associated with message 2 or message 3, significant reduction in resource efficiency and increase in latency may occur. Even in the random access process in the L band, a low-latency random access process may be required in various scenarios of the NR system. Therefore, a 2-step random access process can also be performed on the L band.

[0205] Fig.13 A two-step random access procedure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0206] like Fig.13 As shown in (a), the 2-step random access process can be configured with the following two steps: uplink signal transmission from the terminal to the base station (called message A, corresponding to PRACH preamble code + Msg3 PUSCH); and downlink signal transmission from the base station to the terminal (called message B, and corresponding to RAR + Msg4 PDSCH).

[0207] In addition, in the non-contention random access process, such as Fig.13 As shown in (b), the random access preamble code and the PUSCH part can be sent together.

[0208] although Fig.13Although not shown, a PDCCH for scheduling message B may be transmitted from the base station to the terminal, which may be referred to as Msg.BPDCCH.

[0209] Uplink / downlink signal transmission and reception method in NTN

[0210] The above contents (NR frame structure, NTN system, etc.) can be applied in combination with the method proposed in the present disclosure described later, or can be supplemented to clarify the technical features of the method proposed in the present disclosure.

[0211] In addition, the method to be described later is related to uplink transmission, which can be equivalently applied to the downlink signal transmission method in the above-mentioned NR system or LTE system. It can be modified or replaced to suit the terms, expressions, structures, etc. defined in each system so that the technical ideas proposed in this disclosure can be implemented in the corresponding system.

[0212] In order to ensure wider coverage or provide wireless communication services in places where it is not easy to install wireless communication base stations, the use of NR non-terrestrial network (NTN) or LTE NTN services is being considered. Existing terrestrial network (TN) services such as NR and LTE services provide wireless communication services to UEs by installing corresponding base stations on the ground. On the other hand, in the case where a base station is not installed on the ground, NTN services refer to providing wireless communication services to UEs by installing them in places that are not located on the ground, such as artificial satellites (geostationary orbit, low orbit, medium orbit, etc.), aircraft, unmanned aerial vehicles, drones, etc.

[0213] The frequency bands considered for NR NTN services are mainly considered to be 2 GHz band (S band: 2-4 GHz) in the band below 6 GHz, DL 20 GHz, UL 30 GHz band (Ka band: 26.5-40 GHz) in the band above 6 GHz.

[0214] NR NTN services are mainly divided into two methods: Figure 7 The transparent payload method shown and Figure 8 Regenerative payload method shown. In short, the regenerative payload method means that the satellite itself becomes a gNB, and the transparent payload method means that the satellite sends a corresponding signal when receiving a payload from a ground base station.

[0215] In an existing TN (e.g., NR or LTE), since the UE moves in a cell, even if the distance from the base station changes, when the UE sends a PRACH preamble, the base station receives the preamble within the duration of a specific RACH opportunity (RO) (or PRACH opportunity). In addition, as a timing advance (TA) value for the UE to send a UL signal / channel, it is configured with an initial TA value and a TA offset. These values ​​are values ​​indicated by the base station and correspond to TA values ​​that can be expressed in the cell coverage of the corresponding base station. In addition, in the case of a PDCCH command, if the base station indicates a DCI for the PDCCH command, the UE sends a PRACH preamble and performs UL signal / channel transmission using the TA value (ie, initial TA) indicated by the random access response (RAR) sent from the base station.

[0216] On the other hand, in NTN, the distance between the satellite and the UE changes due to the movement of the satellite regardless of the movement of the UE. To overcome this problem, the location of the UE can be found from the Global Navigation Satellite System (GNSS), and the UE can calculate the UE-specific TA, which is the round-trip delay (RTD) between the UE and the satellite, through the orbital information of the satellite indicated by the base station. Here, when the UE sends a PRACH preamble at a selected RO (i.e., PRACH opportunity), the UE-specific TA is configured so that the satellite (or gNB) can receive the PRACH preamble within the duration of the corresponding RO (i.e., PRACH opportunity). In the case where the PRACH preamble sent from the RO selected by the UE is sent by applying only the UE-specific TA, when the corresponding PRACH preamble arrives at the satellite (or gNB) and is received by the satellite, the PRACH preamble is received with a delay from the reference time of the RO. Therefore, the initial TA value can be indicated by the corresponding delay value in the RAR sent from the base station. In addition, the common TA corresponds to the RTD between the gNB on the ground (or a reference point, where the reference point is the location where the DL frame boundary and the UL frame boundary are aligned) and the satellite, and it can be defined / configured to enable the base station to transmit to the UE.

[0217] In addition, the NTN may configure the TA value as UE-specific TA + common TA (if provided) before Msg1 / Msg A transmission. Here, as described above, the UE-specific TA may refer to the round trip delay (RTD) between the UE and the satellite calculated by the UE itself.

[0218] As mentioned above, NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15kHz, it supports wide areas in traditional cellular bands. In addition, when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency, and wider carrier bandwidth. In addition, when the SCS is 60kHz or greater, it supports bandwidths greater than 24.25GHz to overcome phase noise.

[0219] The NR band is defined by two types of frequency ranges (FR1, FR2). FR1 and FR2 can be configured as shown in Table 2 above. In addition, FR2 may mean millimeter wave (mmW).

[0220] In addition, when the repeated transmission technology introduced for uplink coverage enhancement of the existing NR system is applied in NR NTN, additional UE / base station operations may be required. To this end, the present disclosure proposes a method for configuring / indicating a UE-specific timing advance TA according to specific circumstances.

[0221] According to the current 3GPP Rel-17 NR NTN (or IoT NTN) standard, in order to enable the UE to calculate the UE-specific TA by itself, the base station provides satellite orbit information (i.e., ephemeris information parameters) to the UE via high-layer signaling (e.g., system information block (SIB) 19). However, in this case, since the UE distinguishes whether the cell is an NTN cell or a TN cell according to whether the satellite orbit information is provided, the base station always provides the satellite orbit information in the case of the NTN cell, but does not provide the satellite orbit information in the case of the TN cell. The relevant standard is specified in TS 38.211 and is as follows:

[0222] Downlink transmission, uplink transmission and sidelink transmission are organized into time segments of duration T f =(Δf max N f / 100)·T c = 10 ms radio frame. Here, the size of each field in the time domain is expressed as a time unit T c =1 / (Δf max ·N f ), where Δf max =480·10 3 Hz, and N f =4096. Here, the radio frame is organized into 10 subframes, each subframe having a duration of T sf =(Δf max N f / 1000)·T c =1ms. The number of consecutive OFDM symbols per subframe is N symb subframe,μ=N symb slot N slot subframe,μ Each frame is divided into two equally sized half-frames of five subframes, half-frame 0 consisting of subframes 0-4 and half-frame 1 consisting of subframes 5-9. In this case, there may be one set of frames for the uplink and one set of frames for the downlink. Furthermore, the transmission in uplink frame number i from the UE shall start T earlier than the start of the corresponding downlink frame from the UE. TA =(N TA +N TA,offset +N TA,adj common +N TA,adj UE )T c .

[0223] Here, in addition to the msgA transmission on PUSCH (in this case, N TA =0), N TA and N TA,offset Given by TS 38.213 section 4.2.

[0224] In addition, N given by TS 38.213 Section 4.2 TA,adj common Derived from the higher-level parameters TACommon, TACommonDrift, and TACommonDriftVariation (if configured), otherwise N TA,adj common = 0. Here, the TACommon parameter is a common TA value controlled by the network and may include a timing offset that the network deems necessary. The TACommonDrift parameter indicates the drift rate of the common TA. The TACommonDriftVariation parameter indicates the drift rate variation of the common TA.

[0225] In addition, N given by TS 38.213 Section 4.2 TA,adj UE (if configured) is calculated by the UE based on the higher parameters related to the serving satellite ephemeris and the UE position, otherwise N TA,adj UE =0.

[0226] Table 9 illustrates an example of the NTN-Config information element (IE). NTN-Config provides the UE with the information / parameters required to access NR via NTN access.

[0227] [Table 9]

[0228]

[0229] Referring to Table 9, the parameter (ephemerisInfo) for the ephemeris information provides satellite ephemeris in a position and velocity state vector format or an orbit parameter format.

[0230] The parameter for epoch time (epochTime) indicates the epoch time of the NTN assistance information. If explicitly provided via SIB or dedicated signaling, epochTime is the start time of the DL subframe and is indicated by the subframe number signaled together with the SFN and assistance information. For the serving cell, the sfn field indicates the current SFN or the next SFN after the frame in which the message indicating epochTime is received. For the neighboring cell, sfn indicates the SFN of the frame closest to which the message indicating epochTime is received. The reference point for the epoch time for common TA parameters and serving or neighboring NTN payload ephemeris is the UL time synchronization reference point.

[0231] The parameter for cellSpecificKoffset indicates the scheduling offset used for the modified timing relationship for NTN.

[0232] The parameter for K (kmac) indicates the scheduling offset provided by the network when the downlink frame timing and uplink frame timing are not aligned at the base station.UE operations and assumptions regarding the downlink configuration indicated by the MAC CE command in the PDSCH are required.

[0233] The parameter of NTN polarization for DL ​​(ntn-PolarizationDL), if present, indicates polarization information (including right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP)) for downlink transmission on the serving link.

[0234] The parameter for UL NTN polarization (ntn-PolarizationUL), if present, indicates the polarization for the uplink serving link.

[0235] The parameter for UL synchronization validity duration (ntn-UlSyncValidityDuration) indicates the validity duration configured by the network for the assistance information (i.e., serving and / or neighboring satellite ephemeris and common TA parameters), which indicates the maximum time interval (from epochTime) during which the UE can apply the assistance information without acquiring new assistance information.

[0236] The parameter for common TA (ta-Common) indicates the common TA value controlled by the network and may include a timing offset deemed necessary by the network.

[0237] The parameter for the drift rate change of the common TA (ta-CommonDrift) indicates the drift rate change of the common TA.

[0238] A parameter for TA reporting (ta-Report) indicates that reporting of TA is enabled during random access due to RRC connection establishment or RRC connection recovery and during RRC connection reestablishment when this field is included in SIB19.

[0239] In the above description, reference is made to the UE-specific TA (ie, N TA,adjUE ) related parts, for Terrestrial Network (TN) UE, if the serving satellite ephemeris related upper layer parameters are not provided from the base station, the behavior is defined as treating the UE-specific TA as 0.

[0240] On the other hand, even in the case of an NTN cell (or an IoT NTN cell), in certain situations / cases, providing parameters related to satellite orbit information may be a signaling overhead for the base station. For example, assuming the case where the IoT NTN cell uses a geostationary earth orbit (GEO) satellite, the satellite orbit information hardly changes over time. In addition, since most UEs accessing the cell are low-cost UEs, the processing time required for the UE to calculate the UE-specific TA itself may be considerable. As another example, in the case where a UE with non-GNSS (non-global navigation satellite system) capabilities accesses an NTN cell, or in the case of a low-capability UE such as a RedCap (reduced capability) UE, it may be difficult for the UE to calculate the UE-specific TA itself due to the capabilities of the UE. Therefore, in this case, it may be inefficient for the base station to periodically provide parameters related to satellite orbit information, and therefore the present disclosure proposes the following method.

[0241] Implementation method: Even for NTN cells, the operation of not providing satellite orbit information related parameters may be considered based on (considering) UE capabilities and / or satellite types. In other words, the base station may configure / instruct the UE not to perform the operation of calculating the UE-specific TA using the UE position and satellite orbit information.

[0242] However, in order to distinguish from the TN cell, the NTN base station may configure / indicate / provide a UE-specific TA value (hereinafter referred to as a default UE-specific TA value for the sake of convenience) instead of providing the satellite orbit information related parameters. Therefore, as a result, when the satellite orbit information is not transmitted from the base station and only the default UE-specific TA value is provided, the NTN UE may be configured / defined to receive the default UE-specific TA value as a higher layer parameter (e.g., UE-specific TA) through higher layer signaling (e.g., SIB19, etc.), instead of calculating the UE-specific TA and using it to calculate the total TA (i.e., T TAIn other words, the NTN base station may provide satellite orbit information related parameters (i.e., serving satellite ephemeris related high-level parameters) or UE-specific TA values. When satellite orbit information related parameters are provided, the UE may calculate the UE-specific TA value (i.e., NTN) based on the satellite orbit information related parameters and the UE position. TA,adj UE ) to calculate the total TA(T TA On the other hand, when a UE-specific TA value is provided (ie, a default UE-specific TA), the UE may use the provided UE-specific TA value to calculate the total TA (T TA ).

[0243] If the above proposed method is applied to TS 38.211, it can be applied as follows.

[0244] Downlink transmission, uplink transmission and sidelink transmission are organized into time segments of duration T f =(Δf max N f / 100)·T c = 10 ms radio frame. Here, the size of each field in the time domain is expressed as a time unit T c =1 / (Δf max ·N f ), where Δf max =480·10 3 Hz, and N f =4096. Here, the radio frame is organized into 10 subframes, each subframe having a duration of T sf =(Δf max N f / 1000)·T c =1ms. The number of consecutive OFDM symbols per subframe is N symb subframe,μ =N symb slot N slot subframe,μ Each frame is divided into two equally sized half-frames of five subframes, half-frame 0 consisting of subframes 0-4 and half-frame 1 consisting of subframes 5-9. In this case, there may be one set of frames for the uplink and one set of frames for the downlink. Furthermore, the transmission in uplink frame number i from the UE shall start T earlier than the start of the corresponding downlink frame from the UE. TA =(N TA +N TA,offset +N TA,adj common +N TA,adj UE )T c .

[0245] Here, in addition to the msgA transmission on PUSCH (in this case, N TA =0), N TA and N TA,offset t is given by TS 38.213 section 4.2.

[0246] In addition, N given by TS 38.213 Section 4.2 TA,adj common Derived from the higher-level parameters TACommon, TACommonDrift, and TACommonDriftVariation (if configured), otherwise N TA,adj common = 0. Here, the TACommon parameter is a common TA value controlled by the network and may include a timing offset that the network deems necessary. The TACommonDrift parameter indicates the drift rate of the common TA. The TACommonDriftVariation parameter indicates the drift rate variation of the common TA.

[0247] In addition, N given by TS 38.213 Section 4.2 TA,adj UE (if configured) is calculated by the UE based on higher parameters related to the serving satellite ephemeris and the UE position.

[0248] Alternatively, N given by TS 38.213 section 4.2 TA,adj UE (if configured) is given by higher layer parameters for the UE-specific TA (e.g., UEspecificTA).

[0249] Otherwise, N TA,adj UE =0.

[0250] Here, the virtual UE location for the base station to calculate the default UE-specific TA may be configured / defined as the NTN cell center. Therefore, when the base station provides the value of the default UE-specific TA to multiple UEs in common, each UE-specific TA value may be slightly different depending on the actual location of the UE. Therefore, the total TA value configured (i.e., used) when the PRACH preamble is sent during the RACH procedure (i.e., random access procedure) may be slightly different. However, when the base station receives the PRACH preamble and configures the appropriate closed-loop TA (i.e., NTN cell center) for each UE, the total TA value configured (i.e., used) may be slightly different. TA ) (e.g., through a random access response (RAR)), the UE may be configured to accurately obtain the total TA when sending Msg.3 PUSCH thereafter.

[0251] In addition, as described above, the NTN base station may provide only one of the satellite orbit information related parameters or the default UE-specific TA value to the UE, but the NTN base station may also provide both the default UE-specific TA value and the satellite orbit information related parameters. In this case, the UE may be configured / defined to ignore (or prioritize) one of the default UE-specific TA value and the satellite orbit information related parameters. For example, if the default UE-specific TA value and the satellite orbit information related parameters are provided from the NTN base station at the same time, the UE may be configured to ignore the default UE-specific TA and calculate the UE-specific TA by itself using the satellite orbit information related parameters to calculate the total TA (i.e., T TA Alternatively, on the contrary, if both the default UE-specific TA value and the satellite orbit information-related parameters are provided from the NTN base station at the same time, the UE may be configured to ignore the satellite orbit information-related parameters and use the default UE-specific TA to calculate the total TA (i.e., T TA ) (i.e., the default UE-specific TA value has priority over satellite orbit information related parameters).

[0252] Alternatively, when the default UE-specific TA value and the satellite orbit information related parameters are provided from the NTN base station at the same time, the base station can directly configure / instruct the UE which of the satellite orbit information related parameters and the default UE-specific TA value should be used to calculate the total TA (i.e., T TA In this case, the UE may be configured / defined to calculate / obtain the UE-specific TA according to the configuration / instruction of the base station, and use this value to calculate the total TA (i.e., T TA ).

[0253] In addition, when the base station provides a default value for a UE-specific TA, an actual value may be sent for each period of sending high-layer signaling (i.e., a period of sending high-layer signaling (e.g., SIB19) for sending satellite orbit information related parameters and / or a default UE-specific TA value). For example, a default UE-specific TA value may be provided whenever SIB19 is sent. However, in the case of an IoT NTN environment using GEO, since the satellite appears to be fixed and the UE hardly moves, the initially configured UE-specific TA value may not change for a long time. Therefore, instead of sending a UE-specific TA value in every period (i.e., a period of sending high-layer signaling (e.g., SIB19) for sending satellite orbit information related parameters and / or a default UE-specific TA value), an actual default UE-specific TA value may be provided only in a specific long period (i.e., a period longer than a period of sending high-layer signaling (e.g., SIB19) for sending satellite orbit information related parameters and / or a default UE-specific TA value). Furthermore, it may be configured to provide a difference (or offset value or difference, etc.) relative to a previously transmitted value in other time periods (i.e., a transmission time period (time point) other than a long time period (time point) in a transmission time period (time point) of a high-layer signaling (e.g., SIB19) for transmitting satellite orbit information related parameters and / or a default UE-specific TA value. For example, the default UE-specific TA value may also be configured / indicated as bound to (corresponding to) an NTN platform type (e.g., if explicit indication is supported).

[0254] In addition, a new TA offset parameter may be introduced in order to have a similar result as configuring a default UE-specific TA value. TA_offset_UEspecific ) and the base station configures the corresponding parameter value, the effect of adding the specific offset to the UE-specific TA value calculated by the base station can be obtained. In this case, the base station needs to modify and provide the satellite orbit information parameter according to how the offset value is configured. For example, if a new parameter (e.g., N TA_offset_UEspecific ), the UE can calculate the total TA as T TA =(N TA +N TA,offset +N TA_offset_UEspecific +N TA,adj common +N TA,adj UE )T c , and the UE can calculate N based on the satellite orbit information parameters provided by the base station and the UE position as described above TA,adj UE or N TA,adj UEDetermined as the above-mentioned default UE-specific TA. The above-mentioned newly introduced parameters can be updated by the base station (periodically or aperiodically) and can be updated based on SIB modification or MAC-CE / DCI. In addition, the parameters can be specifically indicated / configured according to the frequency band (ie, separately for each given frequency band).

[0255] As another example, the existing definition of N TA,offset It can be newly defined in the standard specification, or can be newly interpreted and used by the UE in a specific case. That is, if the base station configures / instructs to disable "open-loop TA", the UE can change the existing N TA,offset Configured to be interpreted as a default UE-specific TA value or N TA_offset_UEspecific For example, if "open loop TA" is configured / indicated as enabled, the UE may use (N TA,adj common and)N TA,adj UE to calculate the total TA, while if “open-loop TA” is configured / indicated as disabled, the UE may not use N TA,adj common and N TA,adj UE To calculate the total TA. Here, the base station can TA,offset Configured / indicated as appropriate default UE-specific TA value or N TA_offset_UEspecific Therefore, the UE may be configured / defined to interpret N differently depending on a specific situation (e.g., depending on whether open-loop TA is enabled or disabled). TA,offset .

[0256] The proposed method may be configured / applied to other UL signals / channels such as PUSCH / PUCCH / SRS. In addition, since the examples of the above-mentioned proposed methods may also be included as one of the implementation methods of the present disclosure, they may be considered as a proposed method. In addition, the above-mentioned proposed methods may be implemented independently, but may also be implemented in the form of a combination (or merger) of some proposed methods. Information about whether the proposed method is applied (or information about the rules of the proposed method) may be notified to the UE by the base station via a predefined signal (e.g., a physical layer signal or a high-layer signal) (or, a rule may be defined to notify it). In the present disclosure, for example, the high layer may include one or more of the functional layers such as MAC (Medium Access Control), RLC (Radio Link Control), PDCP (Packet Data Convergence Protocol), RRC (Radio Resource Control) and SDAP (Service Data Adaptation Protocol).

[0257] In the above-proposed method, the entity that sends the signal / channel including information for the default UE-specific TA value may be an NTN gNB or a TN gNB connected to a specific UE.

[0258] Fig.14 A signaling method for uplink transmission and reception methods according to one embodiment of the present disclosure is illustrated.

[0259] Fig.14 The signaling between a base station (eg, TRP 1, TRP 2) and a UE to which the method proposed in the present disclosure can be applied is illustrated. Here, UE / base station is only an example, and various devices can be applied alternatively. Fig.14 It is only for the convenience of explanation and does not limit the scope of the present disclosure. In addition, depending on the situation and / or setting, it can be omitted. Fig.14 Some of the steps shown.

[0260] Reference Fig.14 , the UE receives configuration information related to the NTN from the base station (S1401).

[0261] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0262] Here, the configuration information related to the NTN may refer to configuration information for providing the UE with information required to access a wireless communication system through a non-terrestrial network (NTN) including a satellite.

[0263] The configuration information may be sent via higher layer signaling (eg, SIB, RRC signaling, MAC-CE, etc.).

[0264] The configuration information may include first information for a UE-specific TA and second information for a common TA.

[0265] Here, for example, the first information can be used by the UE to calculate T TA The UE-specific TA value (e.g., the default UE-specific TA) may correspond to the UE-specific TA value of the UE-specific TA, or may correspond to the UE-specific TA value of ... (e.g., the default UE-specific TA) of the UE-specific TA, or may correspond to the UE-specific TA,offset In addition, for example, the second information for the common TA may include high-level parameters TACommon, TACommonDrift, and TACommonDriftVariation.

[0266] In addition, if the first information is used by the UE to calculate T TA If the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0267] In addition, if the first information corresponds to the UE for calculating TTA If a UE-specific TA value (e.g., a default UE-specific TA) is used, the UE position used to derive the UE-specific TA value may be assumed to be the center of the NTN cell. That is, the base station may assume that the UE position is the center of the NTN cell, calculate the UE-specific TA value, and provide it to the UE as the first information.

[0268] In addition, if the first information is used by the UE to calculate T TA If the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA), the configuration information may not include (i.e., may not provide) the (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters) to the UE. Alternatively, on the contrary, if the configuration information includes (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters), the configuration information may not include (i.e., may not provide) the first information to the UE. That is, the base station may provide only one of the first information or the (serving) satellite ephemeris related information / parameters to the UE.

[0269] Alternatively, even if the configuration information includes the first information, the configuration information may also include relevant information / parameters related to (serving) satellite ephemeris (i.e., upper layer parameters related to serving satellite ephemeris). In this case, the UE may determine the UE-specific TA value based on the priority information among the first information and the relevant information / parameters related to (serving) satellite ephemeris (i.e., upper layer parameters related to serving satellite ephemeris). Here, which information among the first information or the relevant information / parameters related to (serving) satellite ephemeris (i.e., upper layer parameters related to serving satellite ephemeris) corresponds to the priority information may be predetermined / defined, or may be configured by the base station. For example, based on the priority of the first information over the relevant information / parameters related to (serving) satellite ephemeris (i.e., upper layer parameters related to serving satellite ephemeris), the UE-specific TA value given by the first information may be used to calculate / derive T TA .

[0270] In addition, if the first information is used by the UE to calculate T TAIf the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA) of the configuration information, the UE-specific TA value (e.g., the default UE-specific TA) is configured to have a longer period (i.e., an indication value) than the transmission period of the configuration information, and the first information may indicate a difference between the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted using the long period and the UE-specific TA value (e.g., the default UE-specific TA) to be newly transmitted. For example, if the configuration information is transmitted using a period of 20 ms, the UE-specific TA value (e.g., the default UE-specific TA) is transmitted using a period of 100 ms, and the first information may indicate a difference when the configuration information is transmitted (i.e., a difference between the UE-specific TA value (e.g., the default UE-specific TA) to be transmitted at that time and the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted). In this case, when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted instead of the difference (i.e., the time when the configuration information is transmitted and the time when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted are the same), the first information may not be transmitted in the configuration information.

[0271] The UE may receive control information (ie, downlink control information) for scheduling / triggering uplink transmission (ie, uplink signals / channels, such as PRACH, PUSCH, PUCCH, SRS, etc.) from the base station (S1402).

[0272] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0273] Here, the control information may be transmitted via the PDCCH. In addition, if the transmission of the uplink signal / channel does not require control information (eg, in the case of transmitting the first message for the random access procedure), this step may be omitted.

[0274] The UE sends uplink transmission (ie, uplink signal / channel, such as PRACH, PUSCH, PUCCH, SRS, etc.) to the base station at a timing determined based on the TA value (S1403).

[0275] Here, the base station may correspond to an NTN base station (eg, a satellite) serving an NTN cell.

[0276] Here, the TA value may be determined based on the UE-specific TA value determined by the first information and the common TA value derived from the second information. As described above, if the first information is used by the UE to calculate T TAIf the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0277] Here, uplink transmission may include PUSCH / SRS / PUCCH / PRACH, etc. For example, in the case of PUSCH, the control information may correspond to DCI for scheduling PUSCH, in the case of SRS, the control information may correspond to DCI for triggering transmission of SRS (in the case of aperiodic SRS transmission), and in the case of PUCCH, the control information may correspond to DCI for scheduling PDSCH, for example.

[0278] In addition, when the uplink transmission corresponds to the first message transmission for the random access procedure, the control information sending and receiving steps can be omitted.

[0279] In this case, the first message for the random access procedure may correspond to the first message for the 4-step random access procedure (see Fig.12 ) of MSG1 (i.e., PRACH or random access preamble sent on PRACH) and / or MSG3 (i.e., PDSCH scheduled by random access response UL grant), and may correspond to the 2-step random access procedure (see Fig.13 )'s MSGA (i.e., PUSCH and PRACH carrying random access preamble codes).

[0280] In addition, if the uplink transmission corresponds to the first message transmission for the random access procedure, the UE receives a second message for the random access procedure from the base station in response to the first message. Then, in the case of a 4-step random access procedure, it can be as follows Fig.12 The sending and receiving operations of MSG3 and MSG4 are performed as shown.

[0281] Here, in the 4-step random access process (see Fig.12 ), the second message for the random access procedure may correspond to MSG2 (i.e., PDSCH, PDCCH for random access response) and / or MSG4 (i.e., PDSCH for contention resolution), and in the 2-step random access procedure (see Fig.13 ), it can correspond to MSGB (ie, PUSCH scheduled by random access response UL grant and PDSCH for contention resolution).

[0282] Fig.15 is a diagram illustrating an operation of a UE for an uplink transmission and reception method according to one embodiment of the present disclosure.

[0283] Fig.15The operation of the UE based on the proposed method is illustrated. Fig.15 The examples are provided for ease of explanation and do not limit the scope of the present disclosure. Depending on the environment and / or settings, the Fig.15 In addition, Fig.15 The UE in is only an example and can be implemented as follows Fig.17 For example, Fig.15 The processor (102 / 202) can control the transceiver (106 / 206) to send and receive channels / signals / data / information, etc., and can also control Fig.15 The processor (102 / 202) stores the transmitted or received channel / signal / data / information etc. in the memory (104 / 204).

[0284] in addition, Fig.15 The operation can be done by Fig.17 One or more processors (102, 202) of the invention are used to process the Fig.15 The operation can be used to drive Fig.17 The instructions / programs (eg, instructions, executable codes) of at least one processor (eg, 102, 202) are stored in a memory (eg, Fig.17 in one or more memories (104, 204)).

[0285] Reference Fig.15 , the UE receives configuration information related to the NTN from the base station (S1501).

[0286] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0287] Here, the NTN-related configuration information may mean configuration information for providing the UE with information required to access a wireless communication system through a non-terrestrial network (NTN) including a satellite.

[0288] The configuration information may be sent via higher layer signaling (eg, SIB, RRC signaling, MAC-CE, etc.).

[0289] The configuration information may include first information for a UE-specific TA and second information for a common TA.

[0290] Here, for example, the first information can be used by the UE to calculate T TA The UE-specific TA value (e.g., the default UE-specific TA) may correspond to the UE-specific TA value of the UE-specific TA, or may correspond to the UE-specific TA value of ... (e.g., the default UE-specific TA) of the UE-specific TA, or may correspond to the UE-specific TA,offsetIn addition, for example, the second information for the common TA may include high-level parameters TACommon, TACommonDrift, and TACommonDriftVariation.

[0291] In addition, if the first information is used by the UE to calculate T TA If the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0292] In addition, if the first information is used by the UE to calculate T TA If the UE position used to derive the UE specific TA value corresponds to the UE specific TA value (e.g., the default UE specific TA), the UE position used to derive the UE specific TA value may be assumed to be the center of the NTN cell. That is, the base station may assume that the UE position is the center of the NTN cell, calculate the UE specific TA value and provide it to the UE as the first information.

[0293] In addition, if the first information is used by the UE to calculate T TA If the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA), the configuration information may not include (i.e., may not provide) the (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters) to the UE. Alternatively, on the contrary, if the configuration information includes (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters), the configuration information may not include (i.e., may not provide) the first information to the UE. That is, the base station may provide only one of the first information or the (serving) satellite ephemeris related information / parameters to the UE.

[0294] Alternatively, even if the configuration information includes the first information, the configuration information may also include relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters). In this case, the UE may determine the UE-specific TA value based on the priority information among the first information and the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters). Here, which information among the first information or the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters) corresponds to the priority information may be predetermined / defined, or may be configured by the base station. For example, based on the priority of the first information over the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters), the UE-specific TA value given by the first information may be used to calculate / derive T TA .

[0295] In addition, if the first information is used by the UE to calculate T TAIf the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA) of the configuration information, the UE-specific TA value (e.g., the default UE-specific TA) is configured to have a longer period (i.e., an indication value) than the transmission period of the configuration information, and the first information may indicate a difference between the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted using the long period and the UE-specific TA value (e.g., the default UE-specific TA) to be newly transmitted. For example, if the configuration information is transmitted using a period of 20 ms, the UE-specific TA value (e.g., the default UE-specific TA) is transmitted using a period of 100 ms, and the first information may indicate a difference when the configuration information is transmitted (i.e., a difference between the UE-specific TA value (e.g., the default UE-specific TA) to be transmitted at that time and the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted). In this case, when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted instead of the difference (i.e., the time when the configuration information is transmitted and the time when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted are the same), the first information may not be transmitted in the configuration information.

[0296] The UE may receive control information (ie, downlink control information) for scheduling / triggering uplink transmission (ie, uplink signals / channels, such as PRACH, PUSCH, PUCCH, SRS, etc.) from the base station ( S1502 ).

[0297] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0298] Here, the control information may be transmitted via the PDCCH. In addition, if the transmission of the uplink signal / channel does not require control information (eg, in the case of transmitting the first message for the random access procedure), this step may be omitted.

[0299] The UE sends uplink transmission (ie, uplink signal / channel, such as PRACH, PUSCH, PUCCH, SRS, etc.) to the base station at a timing determined based on the TA value (S1503).

[0300] Here, the base station may correspond to an NTN base station (eg, a satellite) serving an NTN cell.

[0301] Here, the TA value may be determined based on the UE-specific TA value determined by the first information and the common TA value derived from the second information. As described above, if the first information is used by the UE to calculate T TAIf the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0302] Here, uplink transmission may include PUSCH / SRS / PUCCH / PRACH, etc. For example, in the case of PUSCH, the control information may correspond to DCI for scheduling PUSCH, in the case of SRS, the control information may correspond to DCI for triggering transmission of SRS (in the case of aperiodic SRS transmission), and in the case of PUCCH, the control information may correspond to DCI for scheduling PDSCH, for example.

[0303] In addition, when the uplink transmission corresponds to the first message transmission for the random access procedure, the control information sending and receiving steps can be omitted.

[0304] In this case, the first message for the random access procedure may correspond to the first message for the 4-step random access procedure (see Fig.12 ) of MSG1 (i.e., PRACH or random access preamble sent on PRACH) and / or MSG3 (i.e., PDSCH scheduled by random access response UL grant), and may correspond to the 2-step random access procedure (see Fig.13 )'s MSGA (i.e., PUSCH and PRACH carrying random access preamble codes).

[0305] In addition, if the uplink transmission corresponds to the first message transmission for the random access procedure, the UE receives a second message for the random access procedure from the base station in response to the first message. Then, in the case of a 4-step random access procedure, it can be as follows Fig.12 The sending and receiving operations of MSG3 and MSG4 are performed as shown.

[0306] Here, in the 4-step random access process (see Fig.12 ), the second message for the random access procedure may correspond to MSG2 (i.e., PDSCH, PDCCH for random access response) and / or MSG4 (i.e., PDSCH for contention resolution), and in the 2-step random access procedure (see Fig.13 ), it can correspond to MSGB (ie, PUSCH scheduled by random access response UL grant and PDSCH for contention resolution).

[0307] Fig.16 is a diagram illustrating an operation of a base station for an uplink transmission and reception method according to one embodiment of the present disclosure.

[0308] Fig.16The operation of the base station based on the proposed method is illustrated. Fig.16 The examples are provided for ease of explanation and do not limit the scope of the present disclosure. Depending on the environment and / or settings, the Fig.16 In addition, Fig.16 The base station in is only an example and can be implemented as follows Fig.17 For example, Fig.15 The processor (102 / 202) can control the transceiver (106 / 206) to send and receive channels / signals / data / information, etc., and can also control Fig.15 The processor (102 / 202) stores the transmitted or received channel / signal / data / information etc. in the memory (104 / 204).

[0309] in addition, Fig.16 The operation can be done by Fig.17 One or more processors (102, 202) of the invention are used to process the Fig.16 The operation can be used to drive Fig.17 The instructions / programs (eg, instructions, executable codes) of at least one processor (eg, 102, 202) are stored in a memory (eg, Fig.17 in one or more memories (104, 204)).

[0310] Reference Fig.16 , the base station sends configuration information related to NTN to the UE (S1601).

[0311] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0312] Here, the NTN-related configuration information may mean configuration information for providing the UE with information required to access a wireless communication system through a non-terrestrial network (NTN) including a satellite.

[0313] The configuration information may be sent via higher layer signaling (eg, SIB, RRC signaling, MAC-CE, etc.).

[0314] The configuration information may include first information for a UE-specific TA and second information for a common TA.

[0315] Here, for example, the first information can be used by the UE to calculate T TA The UE-specific TA value (e.g., the default UE-specific TA) may correspond to the UE-specific TA value of the UE-specific TA, or may correspond to the UE-specific TA value of ... (e.g., the default UE-specific TA) of the UE-specific TA, or may correspond to the UE-specific TA,offsetIn addition, for example, the second information for the common TA may include high-level parameters TACommon, TACommonDrift, and TACommonDriftVariation.

[0316] In addition, if the first information is used by the UE to calculate T TA If the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0317] In addition, if the first information is used by the UE to calculate T TA If the UE position used to derive the UE specific TA value corresponds to the UE specific TA value (e.g., the default UE specific TA), the UE position used to derive the UE specific TA value may be assumed to be the center of the NTN cell. That is, the base station may assume that the UE position is the center of the NTN cell, calculate the UE specific TA value and provide it to the UE as the first information.

[0318] In addition, if the first information is used by the UE to calculate T TA If the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA), the configuration information may not include (i.e., may not provide) the (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters) to the UE. Alternatively, on the contrary, if the configuration information includes (serving) satellite ephemeris related information / parameters (i.e., serving satellite ephemeris related high-level parameters), the configuration information may not include (i.e., may not provide) the first information to the UE. That is, the base station may provide only one of the first information or the (serving) satellite ephemeris related information / parameters to the UE.

[0319] Alternatively, even if the configuration information includes the first information, the configuration information may also include relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters). In this case, the UE may determine the UE-specific TA value based on the priority information among the first information and the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters). Here, which information among the first information or the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters) corresponds to the priority information may be predetermined / defined, or may be configured by the base station. For example, based on the priority of the first information over the relevant information / parameters related to (serving) satellite ephemeris (i.e., serving satellite ephemeris related upper-layer parameters), the UE-specific TA value given by the first information may be used to calculate / derive T TA .

[0320] In addition, if the first information is used by the UE to calculate T TAIf the configuration information corresponds to a UE-specific TA value (e.g., a default UE-specific TA) of the configuration information, the UE-specific TA value (e.g., the default UE-specific TA) is configured to have a longer period (i.e., an indication value) than the transmission period of the configuration information, and the first information may indicate a difference between the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted using the long period and the UE-specific TA value (e.g., the default UE-specific TA) to be newly transmitted. For example, if the configuration information is transmitted using a period of 20 ms, the UE-specific TA value (e.g., the default UE-specific TA) is transmitted using a period of 100 ms, and the first information may indicate a difference when the configuration information is transmitted (i.e., a difference between the UE-specific TA value (e.g., the default UE-specific TA) to be transmitted at that time and the UE-specific TA value (e.g., the default UE-specific TA) previously transmitted). In this case, when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted instead of the difference (i.e., the time when the configuration information is transmitted and the time when the UE-specific TA value (e.g., the default UE-specific TA) is transmitted are the same), the first information may not be transmitted in the configuration information.

[0321] The base station may send control information (ie, downlink control information) for scheduling / triggering uplink transmission (ie, uplink signals / channels, such as PRACH, PUSCH, PUCCH, SRS, etc.) to the UE (S1602).

[0322] Here, the base station may correspond to an NTN base station (e.g., a satellite) serving an NTN cell, or may correspond to a TN base station (e.g., a gNB) serving a TN cell.

[0323] Here, the control information may be transmitted via the PDCCH. In addition, if the transmission of the uplink signal / channel does not require control information (eg, in the case of transmitting the first message for the random access procedure), this step may be omitted.

[0324] The base station receives uplink transmission (ie, uplink signal / channel, such as PRACH, PUSCH, PUCCH, SRS, etc.) from the UE at a timing determined based on the TA value (S1603).

[0325] Here, the base station may correspond to an NTN base station (eg, a satellite) serving an NTN cell.

[0326] Here, the TA value may be determined based on the UE-specific TA value determined by the first information and the common TA value derived from the second information. As described above, if the first information is used by the UE to calculate T TAIf the UE-specific TA value given by the first information corresponds to the UE-specific TA value (e.g., the default UE-specific TA), the UE may not calculate the UE-specific TA value and may use the UE-specific TA value given by the first information as is.

[0327] Here, uplink transmission may include PUSCH / SRS / PUCCH / PRACH, etc. For example, in the case of PUSCH, the control information may correspond to DCI for scheduling PUSCH, in the case of SRS, the control information may correspond to DCI for triggering transmission of SRS (in the case of aperiodic SRS transmission), and in the case of PUCCH, the control information may correspond to DCI for scheduling PDSCH, for example.

[0328] In addition, when the uplink transmission corresponds to the first message transmission for the random access procedure, the control information sending and receiving steps can be omitted.

[0329] In this case, the first message for the random access procedure may correspond to the first message for the 4-step random access procedure (see Fig.12 ) of MSG1 (i.e., PRACH or random access preamble sent on PRACH) and / or MSG3 (i.e., PDSCH scheduled by random access response UL grant), and may correspond to the 2-step random access procedure (see Fig.13 )'s MSGA (i.e., PUSCH and PRACH carrying random access preamble codes).

[0330] In addition, if the uplink transmission corresponds to the first message transmission for the random access procedure, the UE receives a second message for the random access procedure from the base station in response to the first message. Then, in the case of a 4-step random access procedure, it can be as follows Fig.12 The sending and receiving operations of MSG3 and MSG4 are performed as shown.

[0331] Here, in the 4-step random access process (see Fig.12 ), the second message for the random access procedure may correspond to MSG2 (i.e., PDSCH, PDCCH for random access response) and / or MSG4 (i.e., PDSCH for contention resolution), and in the 2-step random access procedure (see Fig.13 ), it can correspond to MSGB (ie, PUSCH scheduled by random access response UL grant and PDSCH for contention resolution).

[0332] General devices to which the present disclosure can be applied

[0333] Fig.17 is a diagram illustrating a block diagram of a wireless communication device according to an embodiment of the present disclosure.

[0334] Reference Fig.17 , the first wireless device 100 and the second wireless device 200 can send and receive wireless signals through various radio access technologies (e.g., LTE, NR).

[0335] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, function, process, suggestion, method and / or operation flowchart disclosed in the present disclosure. For example, the processor 102 may transmit a wireless signal including the first information / signal through the transceiver 106 after generating the first information / signal by processing the information in the memory 104. In addition, the processor 102 may receive a wireless signal including the second information / signal through the transceiver 106, and then store the information obtained by the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including commands for executing all or part of the processing controlled by the processor 102 or for executing the description, function, process, suggestion, method and / or operation flowchart disclosed in the present disclosure. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver 106 may be connected to the processor 102 and may send and / or receive wireless signals through one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used in conjunction with an RF (radio frequency) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0336] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, function, process, suggestion, method and / or operation flowchart disclosed in the present disclosure. For example, the processor 202 may generate third information / signal by processing the information in the memory 204, and then transmit the wireless signal including the third information / signal through the transceiver 206. In addition, the processor 202 may receive the wireless signal including the fourth information / signal through the transceiver 206, and then store the information obtained by the signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing all or part of the processing controlled by the processor 202 or for executing the description, function, process, suggestion, method and / or operation flowchart disclosed in the present disclosure. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver 206 may be connected to the processor 202 and may send and / or receive wireless signals through one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used in conjunction with an RF unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0337] In the following, the hardware elements of the wireless device 100, 200 will be described in more detail. Without limitation thereto, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may generate one or more PDUs (protocol data units) and / or one or more SDUs (service data units) according to the descriptions, functions, processes, suggestions, methods, and / or operational flowcharts included in the present disclosure. One or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, suggestions, methods, and / or operational flowcharts disclosed in the present disclosure. One or more processors 102, 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed in the present disclosure to provide it to one or more transceivers 106, 206. One or more processors 102, 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106, 206 according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed in the present disclosure, and obtain the PDU, SDU, message, control information, data, or information.

[0338] One or more processors 102, 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices), or one or more FPGAs (Field Programmable Gate Arrays) may be included in one or more processors 102, 202. The descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, processes, functions, and the like. Firmware or software configured to execute the descriptions, functions, processes, suggestions, methods, and / or operational flow charts disclosed in the present disclosure may be included in one or more processors 102, 202, or may be stored in one or more memories 104, 204 and driven by one or more processors 102, 202. The descriptions, functions, processes, suggestions, methods and / or operational flow charts disclosed in the present disclosure may be implemented by using firmware or software in the form of codes, commands and / or command sets.

[0339] One or more memories 104, 204 may be connected to one or more processors 102, 202 and may store data, signals, messages, information, programs, codes, instructions, and / or commands in various forms. One or more memories 104, 204 may be configured with ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or a combination thereof. One or more memories 104, 204 may be located inside and / or outside one or more processors 102, 202. In addition, one or more memories 104, 204 may be connected to one or more processors 102, 202 via various technologies such as wired or wireless connections.

[0340] One or more transceivers 106, 206 may send user data, control information, wireless signals / channels, etc. mentioned in the method and / or operation flow chart of the present disclosure to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc. mentioned in the description, function, process, suggestion, method and / or operation flow chart disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and may send and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to send user data, control information or wireless signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and one or more transceivers 106, 206 may be configured to transmit and receive user data, control information, wireless signals / channels, etc. mentioned in the description, functions, processes, suggestions, methods, and / or operation flow charts, etc. disclosed in the present disclosure through one or more antennas 108, 208. In the present disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received wireless signals / channels, etc. from RF band signals into baseband signals to process received user data, control information, wireless signals / channels, etc. by using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, wireless signals / channels, etc. processed by using one or more processors 102, 202 from baseband signals into RF band signals. Thus, one or more of the transceivers 106 , 206 may include (analog) oscillators and / or filters.

[0341] The above-mentioned embodiments are to combine the elements and features of the present disclosure in a predetermined form. Unless otherwise explicitly mentioned, each element or feature should be regarded as optional. Each element or feature can be implemented in a form that is not combined with other elements or features. In addition, the embodiments of the present disclosure may include a combination of some elements and / or features. The order of the operations described in the embodiments of the present disclosure may be changed. Some elements or features of an embodiment may be included in other embodiments, or may be replaced by corresponding elements or features of other embodiments. Obviously, the embodiments may include claims that do not have a clear reference relationship in the combined claims, or may be included as new claims by modification after application.

[0342] It is clear to those skilled in the relevant art that the present disclosure can be implemented in other specific forms within the scope of the essential features of the present disclosure. Therefore, the above detailed description should not be interpreted restrictively in every aspect, but should be considered as illustrative. The scope of the present disclosure should be determined by the reasonable interpretation of the attached claims, and all changes within the equivalent scope of the present disclosure are included in the scope of the present disclosure.

[0343] The scope of the present disclosure includes software or machine executable commands (e.g., operating systems, applications, firmware, programs, etc.) that perform operations in a device or computer according to the methods of various embodiments, and non-transitory computer-readable media that enable software or commands, etc. to be stored and executable in a device or computer. Commands that can be used to program a processing system that performs the features described in the present disclosure can be stored in a storage medium or a computer-readable storage medium, and the features described in the present disclosure can be implemented by using a computer program product that includes such a storage medium. The storage medium may include a high-speed random access memory, such as, for example, DRAM, SRAM, DDR RAM, or other random access solid-state storage devices, but is not limited thereto, and it may include non-volatile memory, such as, for example, one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory optionally includes one or more storage devices located away from the processor. The memory, or alternatively, the non-volatile memory device in the memory includes a non-transitory computer-readable storage medium. The features described in this disclosure may be stored in any machine-readable medium to control the hardware of a processing system, and may be integrated into software and / or firmware that allows the processing system to interact with other mechanisms using the results from the embodiments of this disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0344] Here, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may include narrowband Internet of Things for low-power communication, as well as LTE, NR and 6G. Here, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, which may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2 and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may perform communication based on LTE-M technology. Here, for example, LTE-M technology may be an example of LPWAN technology and may be referred to as various names such as eMTC (enhanced machine type communication). For example, LTE-M technology may be implemented in at least any one of various standards, including 1) LTE CAT 0; 2) LTE Cat M1; 3) LTE Cat M2; 4) LTE non-BL (non-bandwidth limited); 5) LTE-MTC; 6) LTE machine type communication; and / or 7) LTE M, etc., and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100, 200 of the present disclosure may include at least any one of ZigBee, Bluetooth, and a low power wide area network (LPWAN) considering low power communication, and is not limited to the above names. For example, ZigBee technology can generate a PAN (Personal Area Network) related to small / low power digital communication based on various standards (e.g., IEEE 802.15.4, etc.), and can be called various names.

[0345] Industrial Applicability

[0346] The method proposed in the present disclosure is mainly described based on examples applied to 3GPP LTE / LTE-A and 5G systems, but can also be applied to various wireless communication systems other than 3GPP LTE / LTE-A and 5G systems.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising the following steps: receiving configuration information from a base station, the configuration information providing information required for the UE to access the wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information for a UE-specific timing advance TA value and second information for a common TA; determining a TA value based on the UE-specific TA value given by the first information and a common TA value derived from the second information; and Uplink transmission is performed at a timing determined based on the TA value.

2. The method according to claim 1, wherein: The first information indicates a default value for the UE-specific TA value that is available without the UE performing calculation.

3. The method according to claim 2, wherein: The UE location used for deriving the default value for the UE specific TA value is assumed to be the center of the NTN cell.

4. The method according to claim 1, wherein: Based on the fact that the configuration information includes the first information, the configuration information does not include service satellite ephemeris related information.

5. The method according to claim 1, wherein: The configuration information also includes service satellite ephemeris related information, and Wherein, based on the fact that the first information has a priority over the serving satellite ephemeris related information, the UE-specific TA value given by the first information is used to derive the TA value.

6. The method according to claim 1, wherein: Which one of the first information or the serving satellite ephemeris related information corresponds to the priority information is configured or predetermined by the base station.

7. The method according to claim 1, wherein: A default value for the UE-specific TA value is configured with a period longer than a transmission period of the configuration information, and The first information indicates a difference between a default value for a previously sent UE-specific TA value and a default value for a newly sent UE-specific TA value.

8. A user equipment UE operating in a wireless communication system, the UE comprising: at least one transceiver, the at least one transceiver configured to send and receive wireless signals; as well as at least one processor configured to control the at least one transceiver, Wherein, the at least one processor is configured to: receiving configuration information from a base station, the configuration information providing information required for the UE to access the wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information for a UE-specific timing advance TA value and second information for a common TA; determining a TA value based on the UE-specific TA value given by the first information and a common TA value derived from the second information; and Uplink transmission is performed at a timing determined based on the TA value.

9. At least one non-transitory computer-readable medium storing at least one instruction, wherein: The at least one instruction executable by at least one processor controls a user equipment UE to: receiving configuration information from a base station, the configuration information providing information required by the UE to access a wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information of a UE-specific timing advance TA value and second information for a common TA; determining a TA value based on the UE-specific TA value given by the first information and a common TA value derived from the second information; and Uplink transmission is performed at a timing determined based on the TA value.

10. A processing device, the processing device being configured to control a user equipment UE in a wireless communication system, the processing device comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, perform operations comprising: receiving configuration information from a base station, the configuration information providing information required for the UE to access the wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information for a UE-specific timing advance TA value and second information for a common TA; determining a TA value based on the UE-specific TA value given by the first information and a common TA value derived from the second information; and Uplink transmission is performed at a timing determined based on the TA value.

11. A method performed by a base station in a wireless communication system, the method comprising the following steps: Sending configuration information to a user equipment UE, the configuration information providing information required by the UE to access the wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information for a UE-specific timing advance TA value and second information for a common TA; and receiving an uplink transmission from the UE at a timing determined based on the TA value, The TA value is determined based on the UE-specific TA value given by the first information and a common TA value derived from the second information.

12. A base station operating in a wireless communication system, the base station comprising: at least one transceiver, the at least one transceiver configured to send and receive wireless signals; as well as at least one processor configured to control the at least one transceiver, Wherein, the at least one processor is configured to: Sending configuration information to a user equipment UE, the configuration information providing information required by the UE to access the wireless communication system through a non-terrestrial network NTN including a satellite, wherein the configuration information includes first information for a UE-specific timing advance TA value and second information for a common TA; and receiving an uplink transmission from the UE at a timing determined based on the TA value, The TA value is determined based on the UE-specific TA value given by the first information and a common TA value derived from the second information.

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