Base station, user equipment, UE, and method performed by UE

Abstract

The invention relates to a base station, user equipment (UE) and a method executed by the UE. Various embodiments relate to a next generation wireless communication system that supports a higher data transfer rate or the like after a fourth generation 4G wireless communication system. According to various embodiments, a method for transmitting / receiving a signal in a wireless communication system and an apparatus supporting the same are provided, and various other embodiments may also be provided.

Description

[0001] This application is a divisional application of the original application No. 202080065642.3 (International Application No. PCT / KR2020 / 012710, filed on September 21, 2020, entitled "Method of transmitting / receiving signal in wireless communication system and apparatus supporting the same"). TECHNICAL FIELD TECHNICAL FIELD

[0002] Various embodiments relate to a wireless communication system. BACKGROUND

[0003] Wireless communication systems are widely deployed to provide various types of communication services such as voice and data. Generally, a wireless communication system is a multiple-access system capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single-carrier frequency division multiple access (SC-FDMA) systems, etc. SUMMARY

[0004] TECHNICAL PROBLEM

[0005] Various embodiments can provide a method for transmitting and receiving a signal in a wireless communication system and an apparatus supporting the same.

[0006] Various embodiments can provide an unaligned carrier aggregation method and / or an asynchronous carrier aggregation method in a wireless communication system and an apparatus supporting the same.

[0007] The technical problems to be solved in the various embodiments are not limited to the above-mentioned matters, and other technical problems not mentioned can be considered by those of ordinary skill in the art from the various embodiments described below.

[0008] TECHNICAL SOLUTION

[0009] Various embodiments can provide a method of transmitting and receiving a signal in a wireless communication system and an apparatus supporting the same.

[0010] According to various embodiments, a method performed by a user equipment (UE) in a wireless communication system can be provided.

[0011] According to various embodiments, the method can include receiving information related to a slot offset between a first cell and a second cell with an unaligned frame boundary, determining the slot offset between the first cell and the second cell based on the information related to the slot offset, and communicating based on a carrier aggregation with the unaligned frame boundary.

[0012] According to various embodiments, the information related to the slot offset can be information on a reference SCS (SubCarrier Spacing) based on the slot offset.

[0013] According to various embodiments, the reference SCS can satisfy a preconfigured condition for defining the reference SCS.

[0014] According to various embodiments, based on the communication, a physical downlink shared channel (PDSCH) can be received.

[0015] According to various embodiments, based on discontinuous reception (DRX) being configured, a physical downlink control channel (PDCCH) for the PDSCH can be monitored in an on-duration associated with the DRX.

[0016] According to various embodiments, the information related to the slot offset can be received based on a higher layer parameter for configuring the second cell.

[0017] According to various embodiments, the information related to the slot offset can include information on an integer value related to the slot offset.

[0018] According to various embodiments, the integer value related to the slot offset can be selected from a preconfigured {-A,..., A}.

[0019] According to various embodiments, A can increase based on the reference SCS increasing, and A can decrease based on the reference SCS decreasing.

[0020] According to various embodiments, A can increase based on the reference SCS increasing, and A can decrease based on the reference SCS decreasing.

[0021] According to various embodiments, the reference SCS can be an SCS satisfying a preconfigured condition among at least one SCS configured in the first cell and at least one SCS configured in the second cell.

[0022] According to various embodiments, the preconfigured condition can include a condition related to a size relationship between the at least one SCS configured in the first cell and the at least one SCS configured in the second cell.

[0023] According to various embodiments, based on (i) determining that the second cell is right-shifted in the time domain with respect to the first cell, and (ii) an SCS used in the first cell and an SCS used in the second cell exceeding 30 kHz, respectively: based on the slot offset, slot 0 of the second cell can be identified as shifted based on being right-shifted in the time domain M times by a time length corresponding to L after being right-shifted by a time length corresponding to 16kappa+L in the time domain before the slot offset is applied.

[0024] According to various embodiments, based on (i) determining that the second cell is shifted left in the time domain with respect to the first cell, and (ii) the SCS used in the first cell and the SCS used in the second cell exceeding 30 kHz, respectively: based on the slot offset, slot 0 of the second cell can be identified after being shifted left in the time domain by a time length corresponding to M times L after applying the slot offset compared to before applying the slot offset.

[0025] According to various embodiments, kappa can be 64, M can be an integer greater than or equal to 0 determined based on the slot offset, and L can relate to a slot length of each of at least one slot other than slot 0 within a 0.5 ms duration of the first cell or the second cell.

[0026] According to various embodiments, the first cell can be a primary cell (PCell) or a primary secondary cell (PSCell).

[0027] According to various embodiments, the second cell can be a secondary cell (SCell).

[0028] According to various embodiments, an apparatus operating in a wireless communication system can be provided.

[0029] According to various embodiments, the apparatus can include a memory and at least one processor connected to the memory.

[0030] According to various embodiments, the at least one processor can be configured to receive information related to a slot offset between a first cell and a second cell that is misaligned with a frame boundary, determine the slot offset between the first cell and the second cell based on the information related to the slot offset, and communicate based on carrier aggregation related to the misaligned frame boundary.

[0031] According to various embodiments, the information related to the slot offset is information of a reference SCS (subcarrier spacing) based on the slot offset.

[0032] According to various embodiments, the reference SCS can satisfy a preconfigured condition for defining the reference SCS.

[0033] According to various embodiments, based on the communication, a physical downlink shared channel (PDSCH) can be received.

[0034] According to various embodiments, based on being configured with discontinuous reception (DRX), a physical downlink control channel (PDCCH) for a PDSCH can be monitored in an on duration associated with the DRX.

[0035] According to various embodiments, the reference SCS is one that satisfies a preconfigured condition among at least one SCS configured in the first cell and at least one SCS configured in the second cell.

[0036] According to various embodiments, the device can communicate with at least one of a mobile terminal, a network, and an autonomous vehicle other than a vehicle including the device.

[0037] According to various embodiments, a method performed by a base station in a wireless communication system can be provided.

[0038] According to various embodiments, the method can include obtaining information related to a slot offset between a first cell and a second cell that are misaligned in frame boundary, transmitting the information related to the slot offset, and communicating based on carrier aggregation related to the misaligned frame boundary.

[0039] According to various embodiments, the information related to the slot offset can be information of a reference SCS (SubCarrier Spacing) based on the slot offset.

[0040] According to various embodiments, the reference SCS can satisfy a preconfigured condition for defining the reference SCS.

[0041] According to various embodiments, based on the communication, a physical downlink shared channel (PDSCH) can be transmitted.

[0042] According to various embodiments, based on discontinuous reception (DRX) being configured, a physical downlink control channel (PDCCH) for a PDSCH can be transmitted in an on duration associated with the DRX.

[0043] According to various embodiments, a device operating in a wireless communication system can be provided.

[0044] According to various embodiments, the device can include a memory and at least one processor connected to the memory.

[0045] According to various embodiments, the at least one processor can be configured to obtain information related to a slot offset between a first cell and a second cell that are misaligned in frame boundary, transmit the information related to the slot offset, and communicate based on carrier aggregation related to the misaligned frame boundary.

[0046] According to various embodiments, the information related to the slot offset is information of a reference SCS (SubCarrier Spacing) based on the slot offset.

[0047] According to various embodiments, the reference SCS can satisfy a preconfigured condition for defining the reference SCS.

[0048] According to various embodiments, a physical downlink shared channel (PDSCH) can be transmitted based on the communication.

[0049] According to various embodiments, a physical downlink control channel (PDCCH) for a PDSCH can be monitored in an on-duration associated with discontinuous reception (DRX) based on the DRX being configured.

[0050] According to various embodiments, an apparatus operating in a wireless communication system can be provided.

[0051] According to various embodiments, an apparatus can include at least one processor; and at least one memory storing at least one instruction for enabling the at least one processor to execute a method.

[0052] According to various embodiments, the method can include receiving information related to a slot offset between a first cell and a second cell that are misaligned in frame boundary, determining the slot offset between the first cell and the second cell based on the information related to the slot offset, and communicating based on carrier aggregation related to the misaligned frame boundary.

[0053] According to various embodiments, the information related to the slot offset can be information of a reference SCS (subcarrier spacing) based on the slot offset.

[0054] According to various embodiments, the reference SCS can satisfy a preconfigured condition for defining the reference SCS.

[0055] According to various embodiments, a physical downlink shared channel (PDSCH) can be received based on the communication.

[0056] According to various embodiments, a physical downlink control channel (PDCCH) for a PDSCH can be monitored in an on-duration associated with discontinuous reception (DRX) based on the DRX being configured.

[0057] According to various embodiments, a processor-readable medium storing at least one instruction for causing one or more processors to execute a method can be provided.

[0058] According to various embodiments, the method can include receiving information related to a slot offset between a first cell and a second cell that are misaligned in frame boundary, determining the slot offset between the first cell and the second cell based on the information related to the slot offset, and communicating based on carrier aggregation related to the misaligned frame boundary.

[0059] According to various embodiments, the information related to the slot offset can be information of a reference SCS (subcarrier spacing) based on the slot offset.

[0060] According to various embodiments, the reference SCS satisfies a preconfigured condition for defining the reference SCS.

[0061] According to various embodiments, based on the communication, a physical downlink shared channel (PDSCH) can be received.

[0062] According to various embodiments, based on discontinuous reception (DRX) being configured, a physical downlink control channel (PDCCH) for a PDSCH can be monitored in an on-duration associated with the DRX.

[0063] The various embodiments described above are only some of the various embodiments and a person of ordinary skill in the art can obtain and understand various embodiments reflecting technical features of the various embodiments based on the detailed description to be described below.

[0064] Advantageous Effects

[0065] According to various embodiments, a method for transmitting and receiving a signal in a wireless communication system and a device supporting the same can be provided.

[0066] According to various embodiments, an unaligned and / or asynchronous carrier aggregation method and a device supporting the same can be provided in a wireless communication system.

[0067] According to various embodiments, a multi-cell / multi-carrier communication method and a device supporting the same can be provided, which considers the use of a frame structure in a wireless communication system effectively.

[0068] Effects obtainable from the various embodiments are not limited to the above described effects and other effects not mentioned above will be clearly understood by a person of ordinary skill in the art from the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0069] The accompanying drawings are provided to help understand various embodiments and provide various embodiments and the detailed description. However, technical features of the various embodiments are not limited to specific drawings and features disclosed in each of the drawings can be combined with each other to constitute new embodiments. Reference numerals in each of the drawings refer to structural elements.

[0070] FIG. 1 is a diagram for describing a physical channel and a signal transmission method using the physical channel, which can be used in various embodiments.

[0071] FIG. 2 is a diagram illustrating a radio frame structure based on an NR system to which various embodiments can be applied.

[0072] FIG. 3is a diagram illustrating a slot structure of an NR system to which various embodiments can be applied.

[0073] FIG. 4 is a diagram illustrating an example in which physical channels are mapped in a slot to which various embodiments can be applied.

[0074] FIG. 5 is a diagram illustrating a structure of an SSB (Synchronization Signal Block) to which various embodiments can be applied.

[0075] FIG. 6 is a diagram illustrating an example of a method for transmitting an SSB to which various embodiments can be applied.

[0076] FIG. 7 is a diagram illustrating an example of a method in which a UE acquires information about DL time synchronization to which various embodiments can be applied.

[0077] FIG. 8 is a diagram illustrating an example of a system information (SI) acquisition procedure to which various embodiments can be applied.

[0078] FIG. 9 is a diagram illustrating an example of a scheduling method in a case of carrier aggregation to which various embodiments can be applied.

[0079] FIG. 10 is a diagram briefly illustrating a method of operating a UE and a network according to various embodiments.

[0080] FIG. 11 is a flowchart illustrating a method of operating a UE and a network according to various embodiments.

[0081] FIG. 12 is a diagram illustrating an example of frame boundary configuration according to various embodiments.

[0082] FIG. 13 is a diagram illustrating an example of a slot structure according to various embodiments.

[0083] FIG. 14 is a diagram illustrating an example of slot shifting according to various embodiments.

[0084] FIG. 15 is a diagram illustrating an example of slot shifting according to various embodiments.

[0085] FIG. 16 is a diagram illustrating an example of slot shifting according to various embodiments.

[0086] FIG. 17 is a diagram illustrating an example of slot shifting according to various embodiments.

[0087] FIG. 18FIG. 1 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0088] FIG. 19 FIG. 2 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0089] FIG. 20 FIG. 3 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0090] FIG. 21 FIG. 4 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0091] FIG. 22 FIG. 5 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0092] FIG. 23 FIG. 6 is a diagram illustrating an example of a time slot shift according to various embodiments.

[0093] FIG. 24 FIG. 7 is a diagram briefly illustrating an initial network access and a subsequent communication procedure according to various embodiments.

[0094] FIG. 25 FIG. 8 is a diagram illustrating a DRX operation according to various embodiments.

[0095] FIG. 26 FIG. 9 is a diagram briefly illustrating an operation method of a UE and a base station according to various embodiments.

[0096] FIG. 27 FIG. 10 is a flowchart illustrating an operation method of a UE according to various embodiments.

[0097] FIG. 28 FIG. 11 is a flowchart illustrating an operation method of a base station according to various embodiments.

[0098] FIG. 29 FIG. 12 is a diagram illustrating a device that can implement various embodiments.

[0099] FIG. 30 A communication system to which various embodiments are applicable is illustrated.

[0100] FIG. 31 A wireless device to which various embodiments are applicable is illustrated.

[0101] FIG. 32 Another example of a wireless device to which various embodiments are applicable is illustrated.

[0102] FIG. 33 A portable device to which various embodiments are applicable is illustrated.

[0103] FIG. 34A vehicle or an autonomous driving vehicle applied to various embodiments is exemplified. DETAILED DESCRIPTION

[0104] The following techniques can be used for various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented using radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented using radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented using radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), etc. UTRA is part of universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using E-UTRA, and LTE-A (advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (new radio or new radio access technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0105] For clarity of description, description is made based on a 3GPP communication system (e.g., LTE, NR, 6G, and next-generation wireless communication system), but the technical idea of various embodiments is not limited thereto. Background, terms, abbreviations, etc. used in the description of various embodiments can refer to matters described in standard documents published before the present disclosure. For example, documents such as 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.215, 3GPP TS 38.300, 3GPP TS 38.321, and 3GPP TS 38.331 can be referred to.

[0106] 1.3GPP system

[0107] 1.1. Physical channel and signal transmission / reception

[0108] A user equipment (UE) receives information from a base station through a downlink (DL) and transmits information to the base station through an uplink (UL). Information transmitted and received between the base station and the UE includes general data information and various control information, and there are various physical channels according to the type / use of information transmitted and received by them.

[0109] FIG. 1 FIG. 1 is a diagram illustrating a physical channel that can be used in various embodiments and a signal transmission method using the physical channel.

[0110] When a power source is turned on again from a power-off state or when a UE newly enters a cell, the UE performs an initial cell search operation such as synchronization with a base station (S11). To this end, the UE receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station to synchronize with the base station and acquires information such as a cell ID.

[0111] Thereafter, the UE can receive a physical broadcast channel (PBCH) signal from the base station to obtain in-cell broadcast information.

[0112] On the other hand, the UE can check a downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search step.

[0113] The UE that has completed the initial cell search can receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to physical downlink control channel information to obtain more specific system information (S12).

[0114] Thereafter, the UE can perform a random access procedure to complete access to the base station (S13-S16). To this end, the UE can transmit a preamble through a physical random access channel (PRACH) (S13), and can receive a random access response (RAR) for the preamble through a physical downlink control channel and a physical downlink shared channel corresponding to the physical downlink control channel (S14). The UE can transmit a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15), and can perform a contention resolution procedure such as receiving a physical downlink control channel signal and a physical downlink shared channel signal corresponding to the physical downlink control channel signal (S16).

[0115] On the other hand, when the random access procedure is performed in two steps, S13 / S15 can be performed as one operation of the UE performing transmission, and S14 / S16 can be performed as one operation of the base station performing transmission.

[0116] The UE performing the above-described procedure can receive a physical downlink control channel signal and / or a physical downlink shared channel signal as a general UL / DL signal transmission procedure (S17), and can perform transmission of a physical uplink shared channel (PUSCH) signal and / or a physical uplink control channel (PUCCH) signal (S18).

[0117] Control information transmitted from the UE to the base station is collectively referred to as uplink control information (UCI). The UCI can include HARQ-ACK / NACK (hybrid automatic repeat and request acknowledgement / negative-ACK), SR (scheduling request), CQI (channel quality indication), PMI (precoding matrix indication), and RI (rank indication) information, etc.

[0118] The UCI can be periodically transmitted through the PUCCH in general, but can be transmitted through the PUSCH when control information and data are to be simultaneously transmitted. In addition, the UE can transmit the UCI through the PUSCH aperiodically according to a request / instruction of the network.

[0119] 1.2. Radio frame structure

[0120] FIG. 2 is a diagram illustrating a radio frame structure based on the NR system to which various embodiments are applicable.

[0121] The NR system can support multiple numerologies. Here, the numerology can be defined by a subcarrier spacing (SCS) and a cyclic prefix (CP) overhead. In this case, multiple subcarrier spacings can be derived by scaling a basic subcarrier spacing by an integer N (or μ). Further, in the case where a very low subcarrier spacing is not used at a very high carrier frequency, the used numerology can be selected independently of a frequency band of a cell. In addition, in the NR system, various frame structures according to multiple numerologies can be supported.

[0122] Hereinafter, an orthogonal frequency division multiplexing (OFDM) numerology and a frame structure that can be considered in the NR system can be described. Multiple OFDM numerologies supported by the NR system can be defined as shown in Table 1. μ and a cyclic prefix for a bandwidth part are obtained from RRC parameters provided by a BS.

[0123] [Table 1]

[0124] μ Δf = 2 μ · 15 [kHz]] Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, extended 3 120 Normal 4 240 Normal

[0125] The NR supports multiple numerologies (e.g., subcarrier spacing) to support various 5G services. For example, when the subcarrier spacing is 15 kHz, a wide area of a legacy cellular band is supported, and when the subcarrier spacing is 30 kHz / 60 kHz, a dense urban area, lower latency, and a wider carrier bandwidth are supported, and when the subcarrier spacing is 60 kHz or more, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.

[0126] The NR band is defined as two frequency ranges, FR1 and FR2. FR1 is a sub-6 GHz range, and FR2 is a millimeter wave (mmWave) range of 6 GHz or more.

[0127] Table 2 below exemplifies the definition of NR bands.

[0128] [Table 2]

[0129] Frequency range designation Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0130] Regarding the frame structure in the NR system, the time-domain size of various fields is expressed as a multiple of T c = 1 / (△f max *N f ). Here, △f max = 480*10 3 Hz, and N f = 4096 as a value related to the size of a fast Fourier transform (FFT) or the size of an inverse fast Fourier transform (IFFT). As the basic time unit of LTE and the sampling time, T c and T s = 1 / ((15 kHz)*2048) have the following relationship: T s / T c = 64. Downlink transmission and uplink transmission are organized into (radio) frames with a duration of T f = (△f max *N f / 100)*T c = 10 ms. Here, each radio frame includes 10 subframes, and the duration of each subframe is T sf = (△f max *N f / 100)*T c = 1 ms. There can be one frame set for uplink and one frame set for downlink. For a numerology μ, slots are numbered in increasing order with n μ s ∈ {0,..., N slot,μ subframe-1 - 1} within a subframe, and in increasing order with n μ s,f ∈ {0,..., N slot,μ frame-1 - 1} within a radio frame. One slot includes N μ symb consecutive OFDM symbols, where N μ symb depends on the cyclic prefix (CP). The start of slot n μ s in a subframe is aligned in time with the start of OFDM symbol n μ s *N μ symb in the same subframe.

[0131] Table 3 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS when a normal CP is used, and Table 4 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS when an extended CP is used.

[0132] [Table 3]

[0133]

[0134] [Table 4]

[0135]

[0136] In the above tables, N slot symb indicates the number of symbols in a slot, N frame,μ slot indicates the number of slots in a frame, and N subframe,μ slot indicates the number of slots in a subframe.

[0137] In an NR system to which various embodiments are applicable, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be configured differently between multiple cells that are merged into one UE. Accordingly, an (absolute time) interval of a time resource (e.g., SF, slot, or TTI) including the same number of symbols (for convenience, collectively referred to as TU (Time Unit)) can be configured differently between the merged cells.

[0138] FIG. 2 is an example of the case of μ = 2 (i.e., subcarrier spacing of 60 kHz), and referring to Table 3, one subframe can include four slots. In FIG. 2 one subframe = {1, 2, 4} slots shown in Table 5 is an example, and the number of slots that can be included in one subframe is defined as in Table 6 or Table 7.

[0139] In addition, a mini-slot can contain 2, 4, or 7 symbols or can contain more or less symbols.

[0140] FIG. 3 is a diagram illustrating a slot structure based on an NR system to which various embodiments are applicable.

[0141] Referring to FIG. 3 , one slot can include a plurality of symbols in the time domain. For example, one slot can include 7 symbols in the case of a normal CP, and one slot can include 6 symbols in the case of an extended CP.

[0142] A carrier can include multiple subcarriers in a frequency domain. A resource block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain.

[0143] A BWP (bandwidth part) can be defined as multiple consecutive (P) RBs in the frequency domain and corresponds to one numerology (e.g., SCS, CP length, etc.).

[0144] A carrier can include up to N (e.g., 5) BWPs. Data communication is made through an activated BWP, and only one BWP can be activated for one UE. Each element in a resource grid is referred to as a resource element (RE) and can map one complex symbol.

[0145] FIG. 4 FIG. is a diagram illustrating an example in which physical channels are mapped in a slot to which various embodiments are applicable.

[0146] DL control channels, DL or UL data, UL control channels, etc. can all be included in one slot. For example, the first N symbols in a slot can be used to transmit DL control channels (hereinafter, referred to as a DL control region), and the last M symbols in the slot can be used to transmit UL control channels (hereinafter, referred to as a UL control region). N and M are each an integer greater than or equal to 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region can be used for DL data transmission or for UL data transmission. There can be a time gap for DL-to-UL switching or UL-to-DL switching between the control region and the data region. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. Some symbols at a time of switching from DL to UL in a slot can be used as a time gap.

[0147] 1.3. Channel Structure

[0148] 1.3.1. Downlink channel structure

[0149] The base station transmits a related signal to the UE through a downlink channel to be described later, and the UE receives a related signal from the base station through a downlink channel to be described later.

[0150] 1.3.1.1. Physical downlink shared channel (PDSCH)

[0151] The PDSCH carries downlink data (e.g., DL shared channel transport block, DL-SCH TB) and a modulation method such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, 256QAM, etc. can be applied. A codeword is generated by encoding the TB. The PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword are mapped to one or more layers (layer mapping). Each layer is generated as an OFDM symbol signal by being mapped to a resource together with a DMRS, and is transmitted through a corresponding antenna port.

[0152] 1.3.1.2. Physical downlink control channel (PDCCH)

[0153] In the PDCCH, downlink control information (DCI) (e.g., DL data scheduling information, UL data scheduling information, etc.) can be transmitted. In the PUCCH, uplink control information (UCI) (e.g., ACK / NACK (acknowledgement / negative-acknowledgement) information for DL data, CSI (channel state information) information, SR (scheduling request), etc.) can be transmitted.

[0154] The PDCCH carries downlink control information (DCI) and applies a QPSK modulation method. According to an aggregation level (AL), one PDCCH is constituted by 1, 2, 4, 8, or 16 CCEs (control channel elements). One CCE is constituted by six REGs (resource element groups). One REG is defined as one OFDM symbol and one (P)RB.

[0155] The PDCCH is transmitted through a control resource set (CORESET). The CORESET is defined as a set of REGs having a given numerology (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE can overlap in the time / frequency domain. The CORESET can be configured through system information (e.g., MIB) or UE-specific higher layer (e.g., radio resource control, RRC, layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) constituting the CORESET can be configured through higher layer signaling.

[0156] The UE acquires the DCI transmitted through the PDCCH by performing decoding (also referred to as blind decoding) on a set of PDCCH candidates. The set of PDCCH candidates decoded by the UE is defined as a set of PDCCH search spaces. The search space set can be a common search space or a UE-specific search space. The UE can acquire the DCI by monitoring the PDCCH candidates in one or more search space sets configured by the MIB or higher layer signaling.

[0157] Table 5 illustrates the characteristics of each search space type.

[0158] [Table 5]

[0159]

[0160] Table 6 illustrates DCI formats transmitted through a PDCCH.

[0161] [Table 6]

[0162] DCI format Purpose 0_0 Scheduling of PUSCH in one cell 0_1 Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1 Scheduling of PDSCH in one cell 2_0 Notifying a set of UEs of slot format 2_1 Notifying a UE that the UE can assume that there is no transmission targeting PRBs and OFDM symbols intended for the UE 2_2 Transmitting TPC commands for PUCCH and PUSCH 2_3 Transmitting a set of TPC commands for SRS transmissions by one or more UEs

[0163] DCI format 0_0 can be used to schedule TB (or TB level) based PUSCH and DCI format 0_1 can be used to schedule TB (or TB level) based PUSCH or CBG (code block group) based (or CBG level) PUSCH. DCI format 1_0 can be used to schedule TB (or TB level) based PDSCH and DCI format 1_1 can be used to schedule TB (or TB level) based PDSCH or CBG (or CBG level) based PDSCH. DCI format 2_0 is used to convey dynamic slot format information (e.g., dynamic SFI) to UEs and DCI format 2_1 is used to convey downlink pre-emption information to UEs. DCI format 2_0 and / or DCI format 2_1 can be conveyed to UEs in a corresponding group through a group common PDCCH, which is a PDCCH that is conveyed to UEs defined as a group.

[0164] 1.3.2. Uplink channel structure

[0165] The UE transmits a related signal to the base station through an uplink channel to be described later, and the base station receives the related signal from the UE through an uplink channel to be described later.

[0166] 1.3.2.1. Physical uplink shared channel (PUSCH)

[0167] A PUSCH carries UL shared channel transport blocks (UL-SCH TBs) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH transmission can be dynamically scheduled by an UL grant in DCI, or can be semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). The PUSCH transmission can be performed on a codebook-based or non-codebook-based basis.

[0168] 1.3.2.2. Physical uplink control channel (PUCCH)

[0169] A PUCCH carries uplink control information, HARQ-ACK, and / or a scheduling request (SR), and is classified into a short PUCCH and a long PUCCH according to a PUCCH transmission length. FIG. 7 PUCCH formats are exemplified.

[0170] [Table 7]

[0171]

[0172] A PUCCH format 0 carries UCI of a maximum size of 2 bits, and is mapped and transmitted based on a sequence. Specifically, the UE transmits a specific UCI to the base station by transmitting one of a plurality of sequences through a PUCCH of the PUCCH format 0. The UE transmits a PUCCH of the PUCCH format 0 in a PUCCH resource configured for a corresponding SR only when the UE transmits a positive SR.

[0173] A PUCCH format 1 carries UCI of a maximum size of 2 bits, and modulation symbols are spread by an orthogonal cover code (OCC) in the time domain (configured differently according to whether frequency hopping is performed). A DMRS is transmitted in a symbol in which a modulation symbol is not transmitted (i.e., time division multiplexing (TDM) is performed and transmitted).

[0174] PUCCH format 2 carries UCI with bit size greater than 2 bits, and modulated symbols are transmitted through DMRS and FDM (frequency division multiplexing). DM-RS is located at symbol indices #1, #4, #7, and #10 in a given resource block with density of 1 / 3. A pseudo noise (PN) sequence is used for the DM_RS sequence. For 2-symbol PUCCH format 2, frequency hopping can be activated.

[0175] PUCCH format 3 is not UE multiplexing in the same physical resource block, and carries UCI with bit size greater than 2 bits. In other words, the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code. Modulated symbols are transmitted through DMRS and time division multiplexing (TDM).

[0176] PUCCH format 4 supports multiplexing up to 4 UEs in the same physical resource block, and carries UCI with bit size smaller than 2 bits. In other words, the PUCCH resource of PUCCH format 3 includes an orthogonal cover code. Modulated symbols are transmitted through DMRS and time division multiplexing (TDM).

[0177] 1.4. Bandwidth Part (BWP)

[0178] In the NR system, a maximum of 400 MHz can be supported per carrier. If a UE operating in such a wideband carrier always operates in the case of a radio frequency (RF) module turned on throughout the carrier, UE battery consumption can increase. Alternatively, considering a plurality of use cases (e.g., eMBB (enhanced mobile broadband), URLLC (ultra-reliable and low-latency communication), mMTC (massive machine type communication), V2X, etc.) operating in one wideband carrier, different numerologies (e.g., subcarrier spacing) can be supported for each frequency band in the corresponding carrier. Alternatively, the maximum bandwidth capability can be different for each UE. In consideration of this, the BS can instruct the UE to work only in a partial bandwidth, not in the entire bandwidth of the wideband carrier, and the partial bandwidth is referred to as a bandwidth part (BWP). In the frequency domain, the BWP is a subset of the contiguous common resource blocks defined for a bandwidth part i on a carrier, and one numerology (e.g., subcarrier spacing, CP length, slot / minislot duration) can be configured. i A subset of the contiguous common resource blocks defined, and one numerology (e.g., subcarrier spacing, CP length, slot / minislot duration) can be configured.

[0179] On the other hand, the BS can configure one or more BWPs in one carrier configured to the UE. Alternatively, when UEs are concentrated in a specific BWP, some UEs can be moved to another BWP for load balancing. Alternatively, considering frequency-domain inter-cell interference cancellation between adjacent cells, a part of the frequency spectrum from the entire bandwidth can be excluded, and two BWPs of a cell can be configured in the same slot. That is, the BS can configure at least one DL / UL BWP for a UE associated with a wideband carrier, can activate at least one DL / UL BWP among the DL / UL BWPs configured at a specific time (through L1 signaling as a physical layer control signal, a MAC control element (CE) as a MAC layer control signal, or RRC signaling), can instruct switching to another configured DL / UL BWP (through L1 signaling, a MAC CE, or RRC signaling, etc.), or can configure a timer value so that the UE switches to a predetermined DL / UL BWP when the timer expires. The activated DL / UL BWP is particularly referred to as an active DL / UL BWP. In a case such as when the UE is in an initial access procedure or before RRC connection setup of the UE, the UE can not receive a configuration for the DL / UL BWP. In this case, the DL / UL BWP assumed by the UE is referred to as an initially activated DL / UL BWP.

[0180] 1.5. SSB (Synchronization Signal Block) transmission and related operations

[0181] FIG. 5 is a diagram illustrating a structure of an SSB (Synchronization Signal Block) to which various embodiments are applicable.

[0182] A UE can perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on an SSB. The SSB is mixed with an SS / PBCH (Synchronization Signal / Physical Broadcast Channel) block.

[0183] Referring to FIG. 5 , an SSB to which various embodiments are applicable can be configured with 20 RBs in four consecutive OFDM symbols. In addition, the SSB is composed of a PSS, an SSS, and a PBCH, and a UE can perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on the SSB.

[0184] PSS and SSS are composed of 1 OFDM symbol and 127 subcarriers, respectively, and PBCH is composed of 3 OFDM symbols and 576 subcarriers. Polar coding and Quadrature Phase Shift Keying (QPSK) are applied to PBCH. PBCH is composed of data REs and Demodulation Reference Signal (DMRS) REs for each OFDM symbol. There are three DMRS REs and three data REs between the DMRS REs for each RB.

[0185] Cell search

[0186] A cell search means a procedure in which a UE acquires time / frequency synchronization of a cell and detects a cell ID (identifier) (e.g., a physical layer cell ID (PCID)) of the cell. PSS is used to detect a cell ID within a cell ID group, and SSS is used to detect a cell ID group. PBCH is used for SSB (time) index detection and half frame detection.

[0187] A cell search procedure of a UE can be organized as shown in Table 8 below.

[0188] [Table 8]

[0189]

[0190]

[0191] There are 336 cell ID groups, and there are three cell IDs for a cell ID group. There are a total of 1008 cell IDs. Information of a cell ID group to which a cell ID of a cell belongs is provided / acquired through SSS of the cell, and information of a cell ID among 336 cells in a cell ID is provided / acquired through PSS.

[0192] FIG. 6 FIG. 1 is a diagram illustrating an example of a method for transmitting an SSB to which various embodiments are applicable.

[0193] Referring to FIG. 6 , an SSB is periodically transmitted according to an SSB period. An SSB basic period assumed by a UE during initial cell discovery is defined as 20 ms. After cell access, the SSB period can be configured by a network (e.g., a base station) to be one of {5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms}. An SSB burst set is constructed at the beginning of an SSB period. An SSB burst set is composed of a time window of 5 ms (i.e., a half frame), and an SSB can be transmitted at most L times in an SSB burst set. The maximum number of transmissions L of an SSB can be given as follows according to a frequency band of a carrier. One slot includes at most two SSBs.

[0194] - For a frequency range of up to 3 GHz, L = 4

[0195] - For the frequency range from 3 to 6 GHz, L = 8

[0196] - For the frequency range from 6 to 52.6 GHz, L = 64

[0197] The time location of an SSB candidate in an SS burst set can be defined as follows according to the SCS. The time location of an SSB candidate is indexed (SSB index) in time order from 0 to L-1 within the SS burst set (i.e., half frame). In the description of various embodiments, candidate SSB and SSB candidate can be used interchangeably.

[0198] - Case A: 15 kHz SCS: The index of the starting symbol of a candidate SSB is given as {2, 8} + 14*n.

[0199] -- When no shared spectrum channel access operation is performed / supported (for operation without shared spectrum channel access) (e.g., L-band, L-cell): If the carrier frequency is 3 GHz or below, n is 0 or 1. If the carrier frequency is 3 to 6 GHz, n is 0, 1, 2, or 3.

[0200] -- When shared spectrum channel access operation is performed / supported (for operation with shared spectrum channel access) (e.g., U-band, U-cell): n is 0, 1, 2, 3, or 4.

[0201] - Case B: 30 kHz SCS: The index of the starting symbol of a candidate SSB is given by {4, 8, 16, 20} + 28*n. If the carrier frequency is 3 GHz or below, n is 0. When the carrier frequency is 3 to 6 GHz, n is 0 or 1.

[0202] - Case C: 30 kHz SCS: The index of the starting symbol of a candidate SSB is given by {2, 8} + 14*n.

[0203] -- When no shared spectrum channel access operation is performed / supported: (1) For paired spectrum operation, when the carrier frequency is 3

[0204] GHz or below, n = 0, 1. If the carrier frequency is within FR1 and greater than 3 GHz, n = 0, 1, 2, 3. (2) For unpaired spectrum operation, when the carrier frequency is 2.4 GHz or below, n = 0, 1. If the carrier frequency is within FR1 and greater than 2.4

[0205] GHz, n = 0, 1, 2, 3.

[0206] -- When shared spectrum channel access operation is performed / supported: n = 0, 1, 2, 3, 4, 6, 7, 8, 9.

[0207] - Case D: 120 kHz SCS: The index of the starting symbol of the candidate SSB is given by {4, 8, 16, 20} + 28*n. For carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

[0208] - Case E: 240 kHz SCS: The index of the starting symbol of the candidate SSB is given by {8, 12, 16, 20, 32, 36, 40, 44} + 56*n. For carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0209] Synchronization procedure

[0210] FIG. 7 FIG. 1 is a diagram illustrating an example of a method in which a UE obtains information about DL time synchronization, to which various embodiments can be applied.

[0211] The UE can acquire DL synchronization by detecting an SSB. The UE can identify the structure of an SSB burst set based on the detected SSB index, and thus can detect symbol / slot / half-frame boundaries. SFN information and half-frame indication information can be used to identify the number of the frame / half-frame to which the detected SSB belongs.

[0212] Specifically, the UE can acquire 10 bits of SFN (System Frame Number) information (s0~s9) from the PBCH. Among the 10 bits of SFN information, 6 bits are obtained from the master information block (MIB), and the remaining 4 bits are obtained from the PBCH transport block (TB).

[0213] Next, the UE can obtain 1 bit of half-frame indication information (c0). When the carrier frequency is 3 GHz or less, the half-frame indication information can be implicitly signaled using the PBCH DMRS. The PBCH DMRS indicates 3 bits of information by using one of eight PBCH DMRS sequences. Thus, in the case of L = 4, the 1 bit remaining among the 3 bits indicated using the 8 PBCH DMRS sequences can be used for the half-frame indication after indicating the SSB index.

[0214] Finally, the UE can obtain the SSB index based on the DMRS sequence and the PBCH payload. SSB candidates are indexed in time order from 0 to L-1 within the SSB burst set (i.e., half frame). When L = 8 or 64, 8 different PBCH DMRS sequences can be used to indicate the LSB (least significant bit) 3 bits (b0 to b2) of the SSB index. When L = 64, the MSB (most significant bit) 3 bits (b3 to b5) of the SSB index are indicated by the PBCH. When L = 2, four different PBCH DMRS sequences can be used to indicate the LSB 2 bits (b0, b1) of the SSB index. When L = 4, 1 bit remaining out of 3 bits indicated by the 8 PBCH DMRS sequences can be used for half frame indication (b2).

[0215] System information acquisition

[0216] FIG. 8 FIG. 1 is a diagram illustrating an example of a system information (SI) acquisition procedure to which various embodiments can be applied.

[0217] A UE can acquire AS (Access Stratum) / NAS (Non-Access Stratum) information through an SI acquisition procedure. The SI acquisition procedure can be applied to a UE in an RRC_IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state.

[0218] SI is divided into a master information block (MIB) and a plurality of system information blocks (SIBs). SI other than the MIB can be referred to as remaining minimum system information (RMSI). Details are as follows.

[0219] The MIB includes information / parameters related to SIB1 (System Information Block Type 1) reception and is transmitted through the PBCH of the SSB.

[0220] The MIB includes information / parameters related to SIB1 (System Information Block Type 1) reception and is transmitted through the PBCH of the SSB. The MIB information can refer to 3GPP TS 38.331 and can include the following fields.

[0221] – subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},

[0222] - ssb-SubcarrierOffset INTEGER (0..15),

[0223] - pdcch-ConfigSIB1 INTEGER (0..255),

[0224] -dmrs-TypeA-Position ENUMERATED{pos2,pos3}, ...

[0226] -spare BIT STRING(SIZE(1))

[0227] Please refer to Table 9 for a description of each field.

[0228] [Table 9]

[0229]

[0230]

[0231] During initial cell selection, the UE assumes that half-frames with SSBs repeat at a period of 20ms. The UE can check the existence of a CORESET (Control Resource Set) for the Type 0-PDCCH common search space (e.g., CORESET#0) based on the MIB. When k SSB <= 23 (for FR1) or k SSB When k <= 11 (for FR2), the UE can determine that a CORESET exists in the common search space for Type 0-PDCCH. SSB >23 (for FR1) or k SSB If the value is >11 (for FR2), the UE can determine that a CORESET does not exist for the Type0-PDCCH common search space. The Type0-PDCCH common search space is a type of PDCCH search space and is used for sending scheduling SI messages. When a Type0-PDCCH common search space exists, the UE can determine (i) multiple consecutive RBs constituting a CORESET (e.g., CORESET#0) and one or more consecutive symbols and (ii) the PDCCH timing (i.e., the time-domain location for PDCCH reception) (e.g., search space #0) based on information in the MIB (e.g., pdcch-ConfigSIB1). When a Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information about the frequency locations where SSB / SIB1 exists and the frequency ranges where SSB / SIB1 does not exist.

[0232] The SIB1 includes information related to availability and scheduling (e.g., transmission period, SI window size) of remaining SIBs (hereinafter, SIBx, x is an integer greater than or equal to 2). For example, the SIB1 can notify whether the SIBx is periodically broadcast or provided through an on-demand method according to a request of the UE. When the SIBx is provided through the on-demand method, the SIB1 can include information required for the UE to perform the SI request. The SIB1 is transmitted through the PDSCH, the PDCCH scheduling the SIB1 is transmitted through the Type0-PDCCH common search space, and the SIB1 is transmitted through the PDSCH indicated by the PDCCH.

[0233] The SIBx is included in an SI message and transmitted through the PDSCH. Each SI message is transmitted within a periodically occurring time window (i.e., SI window).

[0234] 1.5. Carrier Aggregation (CA)

[0235] NR can support a wider uplink / downlink bandwidth part by merging multiple uplink / downlink carriers (i.e., carrier aggregation). A signal can be transmitted / received over multiple carriers through carrier aggregation. When carrier aggregation is applied, each carrier (see FIG. A2) can be referred to as a component carrier (CC). The CCs can be adjacent or non-adjacent to each other in the frequency domain. The bandwidth of each CC can be independently determined. Asymmetric carrier aggregation in which the number of UL CCs and the number of DL CCs are different is also possible. In NR, a radio resource is divided / managed by a cell, and a cell can consist of 1 DL CC and 0 to 2 UL CCs. For example, a cell consists of (i) only one DL CC, (ii) one DC CC and one UL CC, or (iii) one DL CC and two UL CCs (including one supplementary UL of the CC). A cell is divided as follows. In the description of various embodiments, a cell can be interpreted according to the context and can mean, for example, a serving cell. In addition, unless otherwise specified, operations according to various embodiments can be applied to each serving cell.

[0236] - PCell (Primary Cell): In the case of a UE configured with carrier aggregation, a cell operating in a primary frequency (e.g., a primary component carrier (PCC)) in which the UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. In the case of DC (dual connectivity), an MCG (Master Cell Group) cell operating in a primary frequency in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure.

[0237] - SCell (Secondary Cell): In the case of a UE configured with carrier aggregation, a cell providing additional radio resources in addition to a special cell.

[0238] - PSCell (Primary SCG Cell / Primary Secondary Cell): In case of DC, the UE performs random access for a Secondary Cell Group (SCG) cell when performing RRC reconfiguration and synchronization procedure.

[0239] - Special Cell (SpCell): In case of DC, the special cell denotes the PCell of the MCG or the PSCell of the SCG. Otherwise (i.e., non-DC), the special cell denotes the PCell.

[0240] - Serving Cell (ServCell): Indicates a cell configured for a UE in RRC_CONNECTED state. When CA / DC is not configured, there is only one serving cell (i.e., PCell). When CA / DC is configured, the serving cell indicates the special cell and the set of cells including all SCells.

[0241] On the other hand, control information can be configured to be transmitted and received through only a specific cell. For example, UCI can be transmitted through only a special cell (e.g., PCell). When an SCell (hereinafter, referred to as PUCCH-SCell) that allows PUCCH transmission is configured, UCI can also be transmitted through the PUCCH-SCell. As another example, a base station can assign a scheduling cell (set) in order to reduce PDCCH blind decoding (BD) complexity on the UE side. For PDSCH reception / PUSCH transmission, a UE can perform PDCCH detection / decoding only in the scheduling cell. In addition, a base station can transmit PDCCH through only the scheduling cell (set). For example, a PDCCH for a downlink assignment can be transmitted in cell #0 (i.e., scheduling cell), and a corresponding PDSCH can be transmitted in cell #2 (i.e., scheduling cell) (cross-carrier scheduling CCS). The scheduling cell (set) can be configured in a UE-specific, UE group-specific, or cell-specific manner. The scheduling cell includes a special cell (e.g., PCell).

[0242] For CCS, CIF (Carrier Indication Field) is used. CIF can be semi-statically disabled / enabled by a higher layer (e.g., Radio Resource Control RRC) signaling through UE-specific (or UE group-specific). The CIF field is an x-bit field (e.g., x=3) in PDCCH (i.e., DCI), and can be used to indicate a (serving) cell index of a scheduling cell.

[0243] - CIF disabled: CIF is not present in PDCCH. PDCCH on a scheduling cell allocates PDSCH / PUSCH resources on the same cell. That is, the scheduling cell is the same as the scheduled cell.

[0244] - CIF enabled: CIF is present in PDCCH. PDCCH on the scheduling can allocate PDSCH / PUSCH resources on one cell among multiple cells by using CIF. The scheduling cell can be the same or different from the scheduled cell. PDSCH / PUSCH means PDSCH or PUSCH.

[0245] FIG. 9 is a diagram illustrating an example of a scheduling method in a case where carrier aggregation to which various embodiments are applicable. FIG. 9 Scheduling when multi-cell is combined is illustrated.

[0246] Referring to FIG. 9 , it is assumed that 3 cells are combined. When CIF is disabled, each cell can only transmit PDCCH scheduling its own PDSCH / PUSCH (self-carrier scheduling SCS). On the other hand, when CIF is enabled by UE-specific (or UE group-specific or cell-specific) higher layer signaling and cell A is configured as a scheduling cell, in cell A, not only PDCCH scheduling PDSCH / PUSCH of cell A can be transmitted, but also PDCCH scheduling PDSCH / PUSCH of another cell (i.e., a scheduled cell) can be transmitted (cross-carrier scheduling CCS). In this case, PDCCH scheduling its own cell is not transmitted in cell B / C.

[0247] To configure MSG and / or SCG, an information element (IE) CellGroupConfig can be used. A cell group can include one medium access control (MAC) entity, a set of logical channels associated with a radio link control (RLC) entity, a PCell (SpCell), and / or one or more SCells. The CellGroupConfig can include at least the fields of Table 10.

[0248] [Table 10]

[0249]

[0250] For a description of each field of Table 10, refer to Tables 11 to 14.

[0251] [Table 11]

[0252]

[0253]

[0254] [Table 12]

[0255]

[0256] [Table 13]

[0257]

[0258] [Table 14]

[0259]

[0260]

[0261] The IE ServingCellConfigCommon can be used to configure cell-specific parameters of a serving cell of the UE. The IE can include parameters that are typically obtained from SSB, MIB or SIB when the UE accesses the cell in IDLE. According to this IE, the network can provide dedicated signaling of this information when configuring an SCell and / or an additional cell group (SCG) to the UE. In addition, the corresponding information can be provided for SpCell (MCG and / or SCG) when reconfiguring synchronization (at synchronization reconfiguration). The ServingCellConfigCommon can include at least the fields of Table 15.

[0262] [Table 15]

[0263]

[0264] For a description of each field of Table 15, refer to Tables 16 to 17.

[0265] [Table 16]

[0266]

[0267]

[0268]

[0269] [Table 17]

[0270]

[0271] Minimum requirements for NR carrier aggregation

[0272] For intra-band CA, only same-site deployment can be applied. For intra-band discontinuous NR carrier aggregation, the UE should be able to handle at least the relative reception timing difference between the slot timings of different carriers to be combined in the UE receiver. The maximum reception timing difference requirement for intra-band discontinuous NR carrier aggregation can refer to Table 18.

[0273] [Table 18]

[0274]

[0275] For inter-band NR carrier aggregation, a UE should be able to handle at least the relative reception timing difference between the slot timing of all pairs of carriers to be combined in the UE receiver. The maximum reception timing difference requirement for inter-band NR carrier aggregation can refer to Table 19.

[0276] [Table 19]

[0277] Frequency range of carrier pair Maximum reception timing difference (μs) FR1 33 FR2 8 Between FR1 and FR2 25

[0278] deriveSSB-IndexFromCell tolerance

[0279] When deriveSSB-IndexFromCell is enabled, the UE can assume that the cross-cell frame boundary alignment (including half-frame, subframe, and / or slot boundary (border) alignment) of the same frequency carrier is not worse than the minimum (2 SSB symbols, 1 PDSCH symbol) tolerance, and that all SFNs (System Frame Number) of all cells of the same frequency carrier are the same. For the description of derivedSSB-IndexFromCell, refer to Table 20.

[0280] [Table 20]

[0281]

[0282] 2. Various embodiments

[0283] Hereinafter, various embodiments will be described in more detail based on the above-described technical idea. The contents of the above-described first part can be applied to the various embodiments described below. For example, operations, functions, terms, etc. not defined in the various embodiments described below can be performed and described based on the contents of the first part.

[0284] Symbols / abbreviations / terms used in the description of various embodiments can be as follows.

[0285] -A / B / C: A and / or B and / or C

[0286] -ARFCN: Absolute Radio Frequency Channel Number, which can be a code that specifies a pair of reference frequencies for transmission and reception in a wireless communication system.

[0287] -CA: Carrier Aggregation

[0288] -CC: Component Carrier, in the description of various embodiments, CC can be replaced with cell / serving cell, etc.

[0289] -DC: Dual Connectivity

[0290] -Point A: It can be a common reference point of all resource grids in the frequency domain. For example, Point A can be obtained as follows:

[0291] - offsetToPointA for PCell downlink indicates a frequency offset between pointA and the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block used by the UE for initial cell selection, expressed in units of resource blocks, assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2,

[0292] - For other cases, absoluteFrequencyPointA can indicate the frequency location of pointA expressed in ARFCN.

[0293] - SCS: Subcarrier Spacing

[0294] - SFN: System Frame Number

[0295] - Slot n: It can mean a slot having / corresponding to the nth index, and can be replaced with slot #n, etc. For example, similar expressions can be applied to symbol / subframe / frame, etc.

[0296] - ceil(x): [x] ceiling operation, ceil function. It can mean the smallest integer greater than or equal to the real number x and / or the integer greater than or equal to the real number x.

[0297] - floor(x): [x] floor operation, floor function. It can mean the largest integer less than or equal to the real number x and / or the integer less than or equal to the real number x.

[0298] - mod: Modulo operation, modulo operation. For example, the modulo operation can be an operation of a remainder r obtained by dividing a dividend q by a divisor d. (r = q mod(d)).

[0299] In the description of various embodiments, more than / equal to or more than A can be replaced with equal to or more than / more than A.

[0300] In the description of various embodiments, less than / equal to or less than A can be replaced with equal to or less than / less than B.

[0301] In the description of various embodiments, the beginning of a symbol / slot / subframe / frame can be replaced with the beginning boundary of a symbol / slot / subframe / frame, and the end of a symbol / slot / subframe / frame can be replaced with the end boundary of a symbol / slot / subframe / frame.

[0302] In existing carrier aggregation, it is assumed that SFN / frame boundary / slot boundary alignment between all carriers. In the case of intra-band CA, when two signals transmitted from two cells are received, a time difference between the two signals is required to be within 3 µs (microsecond), and in the case of inter-band CA, when two signals transmitted from two cells are received, a reception time difference between the two signals is required to be within 33 µs.

[0303] In a wireless communication system to which various embodiments are applicable (e.g., a wireless communication system supporting NR Release 16 and / or a wireless communication system supporting a version later than Release 16), even in the case of CA, the time boundary used in each carrier can be designed to operate differently. For example, when the time boundary of each cell (each SCell) operates differently and the time difference becomes several hundred µs or more, the UE can recognize / determine / decide that each carrier is asynchronous and attempt an operation such as signal detection to recognize / determine / decide / detect / find the time boundary of each carrier. In this case, for example, the detection complexity of the UE to recognize / determine / decide / detect / find the time boundary of each carrier can increase, and the time added for the SCell can also increase.

[0304] Various embodiments can relate to a method of obtaining time boundary information. For example, it can relate to a method of obtaining inter-carrier and / or inter-cell time boundary information in a multi-carrier system. According to various embodiments, a time information indication method for solving the above-described problem can be provided. For example, a time offset indication method can be provided.

[0305] FIG. 10 is a diagram briefly illustrating a method of operating a UE and a network according to various embodiments.

[0306] FIG. 11 is a flowchart briefly illustrating a method of operating a UE and a network according to various embodiments.

[0307] Referring to FIG. 10 and FIG. 11 In operation 1001, 1101(a), 1101(b) according to various embodiments, the network (e.g., base station) can transmit information related to a time offset, and the UE can receive the information.

[0308] In operation 1003 and 1103(a) according to various embodiments, the UE can determine a time offset between a reference cell / carrier (e.g., a time offset between SCells, etc.) and a target cell / carrier (e.g., an SCell, etc.).

[0309] More specific operations, functions, terms, etc. in operations according to each of the various embodiments can be performed and described based on various embodiments described later. Also, the operations according to each of the various embodiments are exemplary, and one or more of the above operations can be omitted according to the specifics of each embodiment.

[0310] Hereinafter, various embodiments will be described in detail. The various embodiments described below can be all or partially combined to constitute other various embodiments, unless mutually exclusive, as would be clearly understood by those skilled in the art.

[0311] Method 1

[0312] According to various embodiments, a network (e.g., a base station) can provide a UE with time offset information (e.g., information on a time offset value) between carriers and / or cells, and the UE can determine time boundaries constituting a signal using the time offset information provided by the network.

[0313] According to various embodiments, in CA / DC, when a PCell and an SCell and / or a PCell and a PScell and / or a PScell and an SCell operate with different boundaries, the network can define a time boundary as a reference and indicate a time offset for configuring a time boundary of each cell. According to various embodiments, the network can indicate a time offset corresponding to a difference between a reference time boundary and a time boundary of each cell.

[0314] According to various embodiments, the reference time boundary can be a specific cell (e.g., PCell / SpCell / any SCell) as a reference and / or can be configured according to an instruction of the network.

[0315] According to various embodiments, the time offset for configuring a time boundary of each cell can be variously represented such as a slot offset, an SFN offset, an OFDM symbol offset, and a combination, etc.

[0316] According to various embodiments, a reference time duration can be an SCS for a specific cell (e.g., PCell / PSCell / SCell) and / or a specific signal / channel. For example, a reference SCS (and / or an offset SCS) can be an SCS of SS / PBCH of a SpCell and / or an SCS indicated from a network and / or an SCS of any signal / channel used in a corresponding SCell.

[0317] According to various embodiments, a time offset can be indicated based on a reference duration. For example, when a reference SCS is used as a reference duration, the reference SCS can be one of predetermined values (e.g., 15 kHz / 30 kHz / 60 kHz / 120 kHz / 240 kHz), and a time offset (slot offset, SFN offset, OFDM symbol offset, and combination, etc.) for configuring a time boundary of each cell based on the reference SCS can be indicated. According to various embodiments, in consideration of numerologies varying according to SCS, a time length corresponding to the time offset can vary according to a value of the reference SCS. According to various embodiments, granularity of information related to the time offset can vary according to the reference SCS.

[0318] According to various embodiments, information on a time offset (e.g., information on a slot offset) can be transmitted and received based on a value of a reference SCS in carrier aggregation, and the information on the time offset (e.g., information on a slot offset) can indicate a time offset (e.g., slot offset) between a PCell / PSCell and an SCell, and a UE can determine a time offset of the SCell based on the information on the time offset (e.g., information on a slot offset).

[0319] According to various embodiments, a reference SCS is related to a unit (e.g., per slot / slot unit) indicating a time offset, and a reference time boundary can be related to which cell is applied based on a time boundary offset. For example, when a PCell (and / or a reference cell) is configured as 15 kHz SCS, and an SCell (and / or a target cell) is configured as 30 kHz SCS, since a reference SCS is determined as 30 kHz, a time offset (e.g., slot offset) can be indicated in a unit corresponding to the reference SCS (e.g., indicated as 2). In this case, a UE can acquire / determine a time boundary (e.g., slot boundary) of the SCell based on a time offset (e.g., slot offset) indicated by the application (e.g., shifted by 2 slot lengths with respect to a slot boundary of the PCell configured as 15 kHz SCS) based on 30 kHz SCS, based on a time boundary (e.g., slot boundary) of the PCell configured as 15 kHz SCS. In other words, according to various embodiments, slot granularity indicating a slot offset can vary according to a reference SCS indicated by the slot offset.

[0320] According to various embodiments, the reference SCS can be determined based on a pre-configured / defined method. For example, the reference SCS can be determined from among SCSs of cells indicating a time offset. For example, the time offset can indicate an offset between a PSCell / PSCell and an SCell, and the reference SCS can be determined from among SCSs of the PSCell / PSCell and the SCell. According to various embodiments, a specific method of determining the reference SCS can be provided. For example, the reference SCS can be determined based on a size relationship between SCSs of a PSCell / PSCell and an SCell.

[0321] According to various embodiments, when a slot offset is indicated, integer values -A,..., -1, 0, 1,..., A can be used as an offset index, and A can be a different natural number value according to an SCS. According to various embodiments, the granularity of information on a time offset can be determined according to a reference SCS for the time offset. For example, when a slot offset is indicated, integer values -9, -8, -7,..., -1, 0, 1, 2,..., 9 can be used as an offset index. According to various embodiments, when a slot offset index is indicated for a specific cell, the UE identifies / determines / recognizes slots at points spaced apart by the slot offset index based on a reference slot index of a configured reference cell as a reference slot index of the specific cell.

[0322] According to various embodiments, a UE can receive information related to a time offset between a reference cell / carrier and another cell / carrier. According to various embodiments, the UE can receive signals from a plurality of cells / carriers including the reference cell / carrier and the other cell / carrier, and can determine / decide whether time boundaries of the plurality of cells / carriers match based on information related to a time difference and / or a time offset of the received signals. This is an example of various embodiments, and various embodiments are not limited thereto.

[0323] According to various embodiments, a network (e.g., a base station) can receive information related to a time offset between a reference cell / carrier and another cell / carrier. According to various embodiments, the network can transmit a signal for at least one of a plurality of cells / carriers including the reference cell / carrier and the other cell / carrier. According to various embodiments, information related to one or more signals and / or a time offset can be used to determine / decide whether time boundaries of the plurality of cells / carriers match. This is an example of various embodiments, and various embodiments are not limited thereto.

[0324] Embodiment 1. Carrier aggregation

[0325] For example, in carrier aggregation, when the reception time difference of signals transmitted from each cell is within an error range of 3 µs (intra-band) or (approximately) 33 µs (inter-band), it can be assumed that the time boundary is aligned.

[0326] According to various embodiments, when the slot boundary between cells is not matched (however, the SFN is still matched) and if two signals are received through slot staggering (e.g., N slot duration ± 3 µs) (N is an integer and / or an integer greater than or equal to 0 and / or a natural number) (from different cells) within an error range of 3 µs (intra-band) or (approximately) 33 µs (inter-band), the SFN and / or frame boundary of the two cells can be said to be aligned. In various embodiments, slot staggering can refer to a principle of deriving an uplink slot configuration from a downlink slot configuration. For example, the uplink slot configuration can be derived by shifting the slot number according to the downlink slot configuration by N.

[0327] FIG. 12 FIG. is an example illustrating a frame boundary configuration according to various embodiments.

[0328] Referring to FIG. 12 (a), according to various embodiments, when the slot offset is configured / indicated as 0 (N corresponds to 0 µs) and intra-band carrier aggregation is configured between cell #0 (serving cell / reference cell) and cell #1 (target cell), the UE can assume that the SFN and / or frame boundary (corresponding to frame #0) of cell #1 is aligned with the SFN and / or frame boundary (corresponding to frame #0) of the serving cell offset by 0 slots within an error range.

[0329] Referring to FIG. 12 (b), according to various embodiments, when the slot offset is configured / indicated as 2 (N corresponds to 2000 µs, however, this is an example and the actual length of time occupied by the slot offset can vary according to the SCS / numerology), when intra-band carrier aggregation is configured between cell #0 (serving cell) and cell #1 (target cell), the UE can assume that the SFN and / or frame boundary (corresponding to frame #0) of cell #1 is aligned with the SFN and / or frame boundary (corresponding to frame #0) of the serving cell offset by 2 slots within a tolerance range. According to various embodiments, in a time resource located to the left of the slot boundary of slot 0 of cell #1 (e.g., a time resource corresponding to the length of time of the slot offset 2 within the allowed error range), a different signal can be transmitted and received. For example, according to LTE-NR coexistence, a signal based on the LTE system (e.g., PSS, SSS, etc. of the LTE system) can be transmitted / received in the corresponding time resource.

[0330] According to various embodiments, when offset=N is configured / indicated according to a certain IE and carrier aggregation between two cells (or frequencies) is configured, the UE can assume that the SFN and / or frame boundary of the target cell is aligned with the SFN and / or frame boundary of the serving cell with an offset of N slots. For example, the meaning of alignment can include alignment within a tolerance range according to the aforementioned intra-band carrier aggregation and inter-band carrier aggregation.

[0331] According to various embodiments, when offset=N is configured / indicated and carrier aggregation between two cells (or frequencies) is configured, the UE can acquire the SFN and / or frame boundary of the target cell by applying an offset value of N slots to the SFN and / or frame boundary of the serving cell. For example, the SFN and / or frame boundary of the serving cell can be acquired based on a synchronization procedure for obtaining frequency and time synchronization of the serving cell and / or based on a frame boundary alignment assumption and / or based on a method according to various other embodiments.

[0332] According to various embodiments, when the time boundaries of each cell in carrier aggregation are different (e.g., when a slot offset is applied differently for each cell), in N (a natural number) frequency layers, 1) based on the cells of a certain frequency layer 2) in a certain frequency layer, if a slot offset is applied and deriveSSB-IndexFromCell (e.g., a parameter used in SIB2, SIB4, a measurement object, etc.) is configured to "true", the UE can assume that 1) all cells of the certain frequency layer will maintain a reference time boundary, and 2) the same slot offset is applied to all cells of the certain frequency layer.

[0333] According to various embodiments, transmissions in multiple cells can be aggregated. Unless otherwise specified, the method according to various embodiments can be applied to each serving cell.

[0334] According to various embodiments, for carrier aggregation of cells with unaligned frame boundaries, a slot offset between a PCell / PSCell and an SCell can be determined according to a higher layer parameter of the SCell. According to various embodiments, the slot offset can be indicated based on a numerology of a reference SCS, and the reference SCS can correspond to an SCS of a certain cell. The reference SCS can be determined based on one or more of the methods according to various embodiments.

[0335] Embodiment 2. Dual connectivity

[0336] For example, a DC can be classified into a synchronous DC and an asynchronous DC.

[0337] According to various embodiments, a frequency domain (FD) sync indicator (FD-sync indicator) indicating / informing that synchronization is matched or not matched for each carrier and / or each cell can be used. For example, when the frequency domain sync indicator is indicated as true, it can mean that synchronization is matched for each carrier and / or each cell, and when the frequency domain sync indicator is indicated as false, it can mean that synchronization is not matched for each carrier and / or each cell.

[0338] According to various embodiments, when the frequency domain sync indicator is true, synchronization is matched for each carrier and / or each cell. According to various embodiments, even when the frequency domain sync indicator is true, there can be a difference within a range of a certain level of time boundary (e.g., a slot level / OFDM symbol level, etc.). For example, when a time offset is indicated / configured from the network and / or a time offset is assumed, if a time difference between two signals (received from different carriers and / or cells) is within a certain range based on the time offset, the UE can assume that SFN and / or frame boundary is matched.

[0339] According to various embodiments, when offset=N is configured / indicated according to a certain IE and the frequency domain sync indicator is configured as true, the UE can assume that the SFN and / or frame boundary of the target cell is aligned with the SFN and / or frame boundary of the serving cell with an offset of N slots.

[0340] According to various embodiments, when offset=N is configured / indicated according to a certain IE and the frequency domain sync indicator is configured as true, the UE can acquire the SFN and / or frame boundary of the target cell by applying an offset value of N slots to the SFN and / or frame boundary of the serving cell (reference cell). For example, the SFN and / or frame boundary of the serving cell can be acquired based on a synchronization procedure for acquiring frequency and time synchronization of the serving cell and / or based on a frame boundary alignment assumption and / or according to the method of other various embodiments.

[0341] Embodiment 3. Time offset indication method

[0342] According to various embodiments, in a multi-carrier system, when SpCell and / or SCell are added as a method for configuring / indicating a time offset for each carrier and / or each cell, a time offset can be configured / indicated for each carrier and / or each cell.

[0343] According to various embodiments, when a slot offset is configured differently in SCells in carrier aggregation, a slot offset parameter can be configured in an SCellConfig IE. For example, in the case of Scell addition, a slot offset parameter can be included in SCellConfig. For example, a slot offset can be configured / indicated within a pre-configured integer range. For example, referring back to Table 10, sCellSlotOffset for configuring / indicating a slot offset of an SCell can be included in SCellConfig in CellGroupConfig. For example, a slot offset parameter can be configured / indicated as shown in Table 21. For example, in Table 21, M / N can be a constant integer value.

[0344] [Table 21]

[0345]

[0346] And / or, according to various embodiments, a slot offset can be applied to a SpCell.

[0347] According to various embodiments, a cell that is a reference of a time offset (e.g., a slot offset) of a SpCell can be a primary cell and / or a PCell.

[0348] According to various embodiments, a cell that is a reference of a time offset (e.g., a slot offset) of an SCell can be a SpCell and / or a primary cell and / or a PCell. For example, a cell that is a reference of a time offset of an SCell can be a SpCell included in (or configured / defined / indicated based on) CellGroupConfig. As another example, if a SpCell is not defined in CellGroupConfig, a primary cell and / or a PCell can be a reference cell.

[0349] Method 2

[0350] According to various embodiments, when an offset of a slot level is indicated, it can be indicated in units of 0.5ms / or 1ms.

[0351] Embodiment

[0352] FIG. 13 FIG. 1 is a diagram illustrating an example of a slot structure according to various embodiments.

[0353] In a wireless communication system to which various embodiments are applicable, the size of various fields in the time domain can be expressed based on a time unit T c = 1 / (△f max *N f ) here, △fmax is 480*103Hz, and N f is 4096.

[0354] In a wireless communication system to which various embodiments are applicable, a constant k (k, kappa) can be T s / T c = 64, and T s may be 1 / (Δf ref *N f,ref ), and Δf ref may be 15*103Hz, and N f,ref may be 2048.

[0355] For example, a subframe defined in an NR system can be represented by 30720k of 1ms (= 30720*Ts = 30720 / F s , F s = 1 / 2048 / 15000Hz) time length.

[0356] For example, a 15kHz SCS slot length can be 30720k (1ms) (k (k, kappa) = T s / T c = 64), and each half-slot can be 15360k (15344k + 16k) (0.5ms).

[0357] For example, a 30kHz SCS slot length can be 15360k (15344k + 16k) (0.5ms).

[0358] For example, a 60kHz SCS and / or 120kHz SCS slot length can be defined as a value of a remainder of a time except for 16k in front of each 0.5ms divided by a value of a power of 2, and specifically, a 16k length can be added to a slot positioned in advance by 0.5ms (60kHz SCS slot = [7688k, 7672k], 120kHz SCS slot = [3852k, 3836k, 3836k, 3836k]). For example, a length of 16k can be added to a first slot located in the front in the time domain for a 0.5ms duration.

[0359] For example, a slot index can be defined such that a slot located in front of 0.5ms has an index 0. For example, a slot index can be defined such that an index 0 is assigned to a first slot located in the front in the time domain for a 0.5ms duration, and then a sequential index is assigned.

[0360] According to various embodiments, when the slot offset is applied to a specific carrier in inter-band CA, in order to secure that the slot located before 0.5 ms has index 0, the slot offset can be designated in units of 0.5 ms. According to various embodiments, when the slot offset is applied to a specific carrier in inter-band CA, the slot offset can be designated in units of 0.5 ms so that index 0 can be assigned to the first slot located in the front in the time domain for a 0.5 ms duration.

[0361] For example, in the case of 60 kHz SCS and / or 120 kHz SCS slot, the slot offset value can be indicated as -4, -2, 0, 2, 4,... and / or -8, -4, 0, 4, 8, etc. For example, in the case of 60 kHz SCS and / or 120 kHz SCS slot, the slot offset value can be indicated by one of {-4, -2, 0, 2, 4,...} and / or {-8, -4, 0, 4, 8}.

[0362] According to various embodiments, in particular, when alignment between slot indexes within a frame (10 ms) having the same SFN between carriers is configured to be mismatched, the range of the slot offset can be -5 ms / +5 ms.

[0363] According to various embodiments, the slot offset index and / or the slot offset value can depend on a reference numerology and / or a reference SCS used for indicating the slot offset. According to various embodiments, the reference numerology and / or the reference SCS can be pre-configured and / or can be determined based on a specific numerology and / or a specific SCS of the SCell.

[0364] For example, the range of the slot offset index according to the value of the reference SCS can be as follows:

[0365] - For 15 kHz SCS, the slot offset can be -5, -4, -3, -2, -1, 0, 1, 2, 3, 4. For 15 kHz SCS, the slot offset can be indicated by one of {-5, -4, -3, -2, -1, 0, 1, 2, 3, 4}.

[0366] - For 30 kHz SCS, the slot offset can be -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. For 30 kHz SCS, the slot offset can be indicated by one of {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}.

[0367] - For 60 kHz SCS, the slot offset can be (-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9)*2. For 60 kHz SCS, the slot offset can be indicated by one of {-20, -18, -16, -14, -12, -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18}.

[0368] - For 120 kHz SCS, the slot offset can be (-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9)*4. For 120 kHz SCS, the slot offset can be indicated by one of {-40, -36, -32, -28, -24, -20, -16, -12, -8, -4, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36}.

[0369] Method 3

[0370] According to various embodiments, when an offset at a slot level is indicated, a slot offset and / or shift value can be indicated so as to align every 0.5ms on a slot grid including 16k of the front. According to various embodiments, when an offset at a slot level is indicated, a slot offset and / or shift value can be indicated so as to align in a 0.5ms duration with a slot grid including 16k of the front.

[0371] OFDM symbol generation

[0372] For example, for any physical channel and / or signal except for a physical random access channel (PRACH) and / or a remote interference management reference signal (RIM-RS), a time-continuous signal for an antenna port p and an OFDM symbol l e {0, 1,..., N subfrane,μ slot N slot symbol-1 The SCS configuration μ can be determined to satisfy the following Equation 1 (defined by the following Equation 1).

[0373] [Equation 1]

[0374]

[0375] Here, at the beginning t = 0 of a subframe, N μ u and N μ cp l can be determined to satisfy the following Equation 2 (defined by the following Equation 2).

[0376] [Formula 2]

[0377]

[0378] -△f can refer to Table 1

[0379] -μ can be a subcarrier spacing (SCS) configuration.

[0380] -μ0 can be a maximum μ value among SCS configurations by a higher layer parameter scs-SpecificCarrierList.

[0381] Embodiment 1

[0382] According to various embodiments, a slot having a specific index in an existing slot grid can be shifted to have a slot index of 0. According to various embodiments, a slot having a specific index based on a slot grid before shifting can be shifted to become a slot having a slot index of 0 according to a slot offset and / or a shift value.

[0383] For example, in a 60 kHz SCS slot, it can be assumed that slot indexes 0, 1, 2, 3, 4,..., 39 are sequentially configured in the length order of 7688k, 7672k, 7688k, 7672k,..., 7688k, 7672k. For example, when a slot offset is 1, it can be configured in the length order (illustration, 7672k, 7688k, 7672k, 7688k,..., 7672k, 7688k). In this example, when the slot offset is 1, (about) 7688k can be shifted, and a slot duration of slot index 0 can be changed to 7672k. In this example, +16k can not be applied to a case where a slot index is 0 in an OFDM symbol generation formula. For example, referring to Formula 2, for normal CP, l=0, and l=7*2 μ μ cp ,l can be 144k*2 -μ +16k, in this example, 16k is not added, N μ cp ,l can be 144k*2 - μ .

[0384] According to various embodiments, according to slot shifting, a slot including +16k can be changed from a slot having a slot index of 0 to a slot having a non-zero slot index, and in this case, alignment between a target cell and a reference cell can be achieved.

[0385] Slot offset indication

[0386] ​As described above, in a wireless communication system to which various embodiments are applicable, the size of various fields in the time domain can be based on a time unit T c = 1 / (Δf max *N f ), where Δf max may be 480*103Hz, and N f may be 4096.

[0387] In a wireless communication system to which various embodiments are applicable, a constant k can be T s / T c = 64, and T s may be 1 / (Δf ref *N f,ref ), and Δf ref may be 15*103Hz, and N f,ref may be 2048.

[0388] According to various embodiments, a slot offset can be determined so as to satisfy the following Equation 3.

[0389] [Equation 3]

[0390] u is a subcarrier spacing configuration (u = 0, 1, 2, 3, 4), Δf = 2 u · 15 [kHz]

[0391] T c = 1 / (Δf max · N f ), where Δf max = 480·10 3 Hz, N ff = 4096

[0392] k = T s / T c = 64, where T s = 1 / (Δf ref · N f,ref ), Δf ref = 15·10 3 Hz, and N f,ref = 2048

[0393] T o = N o T c

[0394] N o = 16k·floor((O S + ceiling(2 u-I )-1)·2 l-u )+15344k·OS • 2 1-u where M = 10 · 2 u , O, = -M,..., M

[0395] In Equation 3, T o may relate to a length of time shift in the time domain according to a slot offset, and N o relates to a length of time shift in the time domain, and O s may be associated with a slot offset index and / or a slot offset value indicated by one or more of the methods according to various embodiments. According to various embodiments, a minimum / maximum value and / or granularity of the slot offset index and / or the slot offset value can vary according to the SCS (reference SCS).

[0396] As described above, since 16k is added to the first slot within each 0.5 ms compared to other slots, the amount of shift per slot offset index and / or slot offset value 1 can be 16k+L or L according to the SCS, and N o floor operation part can take this into account.

[0397] FIG. 14 is a diagram illustrating an example of slot shifting according to various embodiments.

[0398] In the description of various embodiments, L may mean, in the case of 120 kHz SCS, a length obtained by dividing a remaining length obtained by subtracting 16k from 0.5 ms into four equal parts, i.e., a length corresponding to the division of the remaining length into four equal parts. For convenience, 2 L , 4 L of 60 kHz SCS, 30 kHz SCS, and 15 kHz SCS can be indicated.

[0399] In the description of various embodiments, L can be a value determined according to the SCS, in the case of 60 kHz SCS, a slot length can be 16k+L (= 16k+2 L ) and / or L (2 L ), and in the case of 30 kHz SCS, a slot length can be 16k+L (= 16k+4 L ), and in the case of 15 kHz SCS, a slot length can be 2*(16k+L) (= 2*(16k+4 L ).

[0400] Referring to FIG. 14In case of 15 kHz SCS, 30 kHz SCS, each slot offset index and / or slot offset value 1 can be shifted by 16k+L, but in case of 60 kHz SCS, it can be shifted by 16k+L or L per slot offset value 1.

[0401] Embodiment 2

[0402] According to various embodiments, a slot can be shifted regardless of an existing slot grid so that a slot index 0 is always 16k. According to various embodiments, a slot having a slot index 0 can always include +16k regardless of a pre-shifted slot grid. For example, referring to Equation 2, in OFDM symbol generation, a slot having a slot index 0 is assumed to include a slot of 16k, and according to various embodiments, a slot having a slot index 0 always includes +16k regardless of a pre-shifted slot grid, and thus, according to various embodiments, a separate method for generating an OFDM symbol can not be needed.

[0403] For example, in a 60 kHz SCS slot, it can be assumed that slot indexes 0, 1, 2, 3, 4,..., 39 are configured in the order of lengths of 7688k, 7672k, 7688k, 7672k,..., 7688k, 7672k. For example, even if a slot offset is 1, lengths can be configured in the order of 7688k, 7672k, 7688k, 7672k,..., 7688k, 7672k. In this example, when the slot offset is 1, (about) 7688k can be shifted, and a slot duration of slot index 0 can be maintained at 7688k.

[0404] Embodiment 3

[0405] According to various embodiments, an end of a symbol can be considered as a boundary and it can be shifted.

[0406] For example, when there are a slot #0, a slot #1,..., a slot #n-1 in a 0.5 ms half subframe, if a length of the slot #0 is 16k+L, lengths of the slot #1,..., and the slot #n-1 are all L, if a slot offset is positive / negative (shifted to the right in a time domain) so that all variable length slots are shifted, a shift length can be shifted n-1 times L length and then shifted by 16k+L length once, and if the slot offset is negative / positive (shifted to the left in the time domain), the shift length can be shifted by 16k+L length once and then shifted n-1 times L length in the order of shifting.

[0407] Embodiment 4

[0408] According to various implementation methods, it can be shifted based on the head of the symbol.

[0409] According to various implementation methods, when shifting to the right n times, it can first shift by a length of 16k+L, and then shift by a length of L n-1 times.

[0410] For example, when there are time slots #0, #1, ..., #n-1 in a 0.5ms half-frame, if the length of time slot #0 is 16k+L, then the lengths of time slots #1, ..., and #n-1 are all L. If the time slot offset is positive / negative (shifted to the right in the time domain) so that all variable-length time slots are shifted, then the shift length is shifted once by 16k+L, and then shifted n-1 times by L. If the time slot offset is negative / positive (shifted to the left in the time domain), then the shift length can be shifted n-1 times by L, and then shifted once by 16k+L.

[0411] The above implementation can be an example of a scheme in which all samples in 0.5ms are shifted to be considered valid samples. According to the above implementation, when shifting by 1 time slot, all n time slots constituting 0.5ms can be shifted by the same length at a specific shift time (shifted by 16k+L sample lengths or shifted by L sample lengths).

[0412] As described above, for example, the length of the 60kHz SCS and / or 120kHz SCS time slots can be defined as the remaining time excluding the 16k preceding each 0.5ms time slot divided by a power of 2 (e.g., 2, 4), and specifically, the 16k length can be added to the time slot preceding the 0.5ms time slot (60kHz SCS time slot = [7688k, 7672k], 120kHz SCS time slot = [3852k, 3836k, 3836k, 3836k]). For example, the 16k length can be added to the first time slot that is first in the time domain during the 0.5ms duration. The shift order described above can be considered by adding the 16k length to the first time slot that is first in the time domain during the 0.5ms duration.

[0413] Method 4

[0414] According to various implementations, the first 16k segments of each 0.5ms interval can be considered as a fixed duration that does not move (an invalid interval from the perspective of the temporary time slot during the shift), and a time slot offset can be applied.

[0415] According to various implementations, a key feature is that the shift distance for each temporary time slot can be different for each time slot. According to various implementations, only time slots of a fixed duration can shift 16k+L samples, while other time slots can shift L samples.

[0416] According to various embodiments, a method of continuing to stay at an original position is described with respect to a portion of a 16k length duration per 0.5ms as a common fixed duration.

[0417] According to various embodiments, once all time slots 0, 1,.., n-1 within 0.5ms can be generated from a temporary time slot of length L, a first time slot can be generated as a slightly longer time slot (16k+L length) by further extending a CP of a first symbol of the temporary time slot by 16k based on a position (0.5ms) of a non-shifted half subframe. According to various embodiments, the remaining temporary time slots can be the time slots without change.

[0418] According to various embodiments, a definition of shifting 1 time slot (left or right) can be as follows.

[0419] For example, upon shifting, once temporary time slots of length L can be shifted by different amounts, and among the shifted temporary time slots, a time slot that passes through a common fixed duration (a front 16k length interval of an original non-shifted 0.5ms half subframe) can be shifted by 16k+L, and a time slot that does not pass through the common fixed duration can be shifted by only L.

[0420] For example, when m time slots need to be shifted, after shifting 1 time slot of a temporary time slot continuously m times according to a method based on various embodiments, a temporary time slot immediately located after a 16k length common fixed duration can extend a CP of a first symbol by 16k to generate an actual time slot of length 16k+L, and the remaining temporary time slots can be the original actual time slots.

[0421] Method 4 - Enhancement

[0422] According to the above principle based on various embodiments, when a time slot length of a shifted cell (e.g., SCell) is less than or equal to a time slot (and / or time slot unit) length of a timing-fixed reference cell (e.g., PCell / PSCell), an explicit operation can be provided.

[0423] Hereinafter, according to various embodiments, in order to provide a clear operation in all cases including a case where a time slot length of a shifted cell is greater than a time slot length of a timing-fixed reference cell, a clearer operation is expressed by using an equation, etc.

[0424] As described below, according to various embodiments, a time slot unit as a unit of indicating a time slot offset can be indicated based on a reference SCS. For example, a time slot having the same length or a shorter length among time slots of a shifted cell (e.g., a target cell) and time slots of a reference cell having fixed timing can be a time slot unit. More detailed information can be referred to a description of a time slot unit according to various embodiments.

[0425] For example, when the slot unit is 1 ms (i.e., the slot unit is greater than 0.5 ms, in this case, it can be the case that the SCS of the shifted cell and the SCS of the reference cell can be SCS = 15 kHz):

[0426] Shifting i slot units (and / or i slot units) can mean shifting by the number of i*2*15360k (= i*32720k) samples. For example, if i is negative, it can mean shifting to the left in the time domain, and if i is positive, it can mean shifting to the right in the time domain.

[0427] In a wireless communication system (e.g., a 5G NR system) to which various embodiments are applicable, a cell having a shorter slot length among two cells is an equivalent expression of a cell having a larger SCS among the two cells (i.e., a shorter slot length can be an equivalent expression of a larger SCS), and the slot lengths of the two cells being the same can be an equivalent expression of the SCSs of the two cells being the same.

[0428] In the description of various embodiments, when the slot unit is less than or equal to 0.5 ms, k (kappa) can be T s / T c = 64, as described above, and N can be defined as the number of slot units within 0.5 ms. In the description of various embodiments, the slot unit and the slot can be used interchangeably.

[0429] For example, shifting i slot units (and / or i slot units) can mean, for L = (15360k - 16k) / N, when P = floor(i / N) (P is a negative integer, 0, or a positive integer), and

[0430] r = (i mod N), (r = 0, 1,..., N-1)

[0431] Then,

[0432] First, the slot index j (0 <= j < K, K is the number of slots in a 10 ms frame of the shifted cell) of the shifted cell (e.g., SCell)

[0433] is changed to,

[0434] Slot index ((j-P) mod K)

[0435] Then, all slots

[0436] If r < N, an additional shift of (-r*L) samples is applied;

[0437] If r >= N, an additional shift of (-(16k+r*L)) samples is applied,

[0438] For example, shifting a negative integer can mean shifting to the left in the time domain, and shifting a positive integer can mean shifting to the right in the time domain.

[0439] For example, in order to represent shifting by i time slot units (and / or i time slot units),

[0440] First, shift the time slot index j (0 <= j < K, K is the number of time slots in a 10 ms frame of the shifted cell) of the cell (e.g., SCell)

[0441] may be changed to

[0442] the time slot index ((j - ceil(i / M)) mod K)

[0443] Then,

[0444] If (ceil(i / M)*M - i) < N, shift by (-(ceil(i / M)*M - i)*L) samples;

[0445] If (ceil(i / M)*M - i) >= N, shift by (-(16k + (ceil(i / M)*M - i)*L)) samples,

[0446] All time slots of the cell can be additionally shifted. For example, shifting a negative integer can mean shifting to the left in the time domain, and shifting a positive integer can mean shifting to the right in the time domain.

[0447] For example, when all time slot boundaries of a cell having a lower SCS can be aligned with time slot boundaries of a cell having a higher SCS, the two cells can be referred to as time slot aligned. According to various embodiments, perfect time slot alignment can be achieved between the shifted cell and the reference cell.

[0448] In a wireless communication system (e.g., a 5G NR system) to which various embodiments are applicable, when time slots are not shifted, but only a time slot length corresponding to a time slot index value m*N (0 <= m*N < K, m is an integer) is longer than lengths of other time slots by 16k, and the lengths of the other time slots are the same, according to the above-described various embodiments, after shifting by i time slot units, only a time slot length corresponding to a time slot index value (m*N - ceil(i / M)) mod K can be longer than lengths of other time slots by 16k, and the lengths of the other time slots can be changed to be the same.

[0449] Example 1

[0450] For example, when the length of a time slot of a shifted cell (e.g., Scell) is the same as the length of a time slot unit (e.g., when the time slot unit is defined to have a time slot length equal to or less than the time slot length of two cells, the time slot length of the shifted cell is less than or equal to the time slot length of the reference cell, etc.):

[0451] Shifting i time slot units can mean

[0452] The time slot index j (0 <= j < K, K is the number of time slots in a 10 ms frame of the shifted cell) of the shifted cell (e.g., Scell)

[0453] is changed to

[0454] The time slot index ((j-i / M) mod K),

[0455] is then completed. For example, additional shifting in a sample unit can not be needed.

[0456] Example 2

[0457] For example, when i time slot units are to be shifted, when the value of i corresponds to an integer multiple of M (M is the number of time slot units within one time slot length of the shifted cell (e.g., Scell)):

[0458] Shifting i time slot units can mean

[0459] The time slot index j (0 <= j < K, K is the number of time slots in a 10 ms frame of the shifted cell (e.g., Scell)) of the shifted cell

[0460] is changed to

[0461] The time slot index ((j-i / M) mod K)

[0462] is then completed. For example, additional shifting in a sample unit can not be needed.

[0463] Example 3

[0464] For example, when M <= N (that is, when the length of a time slot of a shifted cell (e.g., Scell) is equal to or less than 0.5 ms, that is, when the SCS of the shifted cell (e.g., Scell) is greater than 15 kHz, etc.):

[0465] Shifting i time slot units can mean

[0466] First, the time slot index (0 <= j < K, K is the number of time slots in a 10 ms frame of the shifted cell (e.g., Scell)) of the shifted cell

[0467] is changed to

[0468] Slot index ((j - ceil(i / M)) mod K)

[0469] Then,

[0470] All slots of the cell that are shifted by -(ceil(i / M)*M-i*L) samples

[0471] are further shifted. For example, a shift of a negative number can mean a shift to the left in the time domain, and a shift of a positive number can mean a shift to the right in the time domain.

[0472] Hereinafter, a specific example / formula for indicating a slot offset according to various embodiments will be described.

[0473] Slot unit for shifting

[0474] For example, when the number of slot units within 0.5 ms is N (an integer / natural number greater than or equal to 0), a slot offset can be indicated based on

[0475] - a slot of a higher SCS among SCSs between the PCell and the SCell, and / or

[0476] - a slot having a length corresponding to a higher SCS among SCSs of an SSB of the PCell and SCSs of an SSB of the SCell, and / or

[0477] - a slot having a length corresponding to a higher SCS among a lowest SCS among BWPs of the PCell and a lowest SCS among BWPs of the SCell, and / or

[0478] - a slot having a length corresponding to an SCS of an SSB of the PCell, and / or

[0479] - a slot having a length corresponding to an SCS of an SSB of the SCell, etc.

[0480] And various other methods can be considered. That is, according to various embodiments, a reference SCS for indicating a slot unit as a unit for indicating a slot offset can be determined based on the above-described methods.

[0481] Time sample for slot shifting (Formula 1)

[0482] For example, i slot units can be expressed as i = Q*N + R [slot units] (R < N) ((N: the number of slot units within 0.5 ms, R is an integer from 0 to N-1, and Q is a quotient of i divided by N)). According to various embodiments, the number of samples of a shifted slot can be expressed as follows:

[0483] A. When a criterion for aligning a slot boundary is configured to the end of a slot:

[0484] When shifting is needed in i slot units,

[0485] Right shift: Q*(16k+N*L)+R*L [samples]

[0486] Left shift: Q*(16k+N*L)+(16k+R*L) [samples]

[0487] Here, the length of the slot index M*N can be 16k+L [samples], the length of the slot index M*N+j can be L [samples] (1≤j≤N-1), M can be an arbitrary integer, and L can be (S-16k) / N, and S can be 15360k.

[0488] And / or according to various embodiments, the number of samples in a shifted slot can be indicated as follows:

[0489] B. When the criteria for slot boundary alignment is configured to the start of a slot:

[0490] When shifting is needed in i slot units,

[0491] Right shift: Q*(16k+N*L)+(16k+R*L) [samples]

[0492] Left shift: Q*(16k+N*L)+R*L [samples]

[0493] Time sample for slot shifting (Formula 2)

[0494] In the following, μ={0, 1, 2, 3, 4} can be determined as the SCS (2 μ ) of the slot unit for shifting.

[0495] For example, given a slot offset S offset , according to various embodiments, the number of samples in a shifted slot can be expressed as follows:

[0496] If μ>0, then

[0497] (-M*S+(Q*S+R*L)) [samples]

[0498] Here, S offset can be {-M*N, -M*N+1,..., (M+1)*N-1}, Q can be floor((M*N+S offset ) / N), R can be mod((M*N+S offset ) / N), N can be 2^(μ-1), S can be 15360k, and L can be (S-16k) / N.

[0499] If μ>0, then

[0500] (-M*S+(Q*S))[samples]

[0501] Here, S offset may be {-M*N,...,(M+1)*N-1}, Q may be floor(M*N+S offset ) / N), N may be 2^(μ-1), and S may be 15360k.

[0502] According to various embodiments, a slot shifting method according to a slot offset can be provided. Some terms used in the description of various embodiments can be defined as follows.

[0503] [When the slot unit is 1 ms]

[0504] As described above, according to various embodiments, a slot unit, which is a unit indicating a slot offset, can be indicated based on a reference SCS. For example, a slot having the same length or a shorter length among slots of a shifted cell (e.g., a target cell) and slots of a reference cell having a fixed timing can be a slot unit. More detailed information can be referred to the description of a slot unit according to various embodiments.

[0505] For example, when the slot unit is 1 ms (that is, when the slot unit is greater than 0.5 ms, in this case, both the SCS of the shifted cell and the SCS of the reference cell can be SCS=15 kHz):

[0506] Shifting i slot units (and / or i slot units) can mean shifting by the number of i*2*15360k (=i*32720k) samples. For example, when i is negative, it can mean shifting to the left in the time domain, and when i is positive, it can mean shifting to the right in the time domain.

[0507] In a wireless communication system (e.g., a 5G NR system) to which various embodiments are applicable, a cell having a shorter slot length among two cells can be an equivalent expression of a cell having a larger SCS among the two cells (that is, a shorter slot length can be equivalent to a larger SCS), and a same slot length of two cells can be an equivalent expression of a same SCS of the two cells.

[0508] [When the slot unit is equal to or less than 0.5 ms]

[0509] In the description of various embodiments, when the slot unit is less than or equal to 0.5 ms, k (kappa) can be k=T s / T c= 64, as described above, and N can be defined as the number of slot units within 0.5 ms. In the description of various embodiments, a slot unit and a slot can be used interchangeably.

[0510] For example, according to the method based on various embodiments, the shifting of i slot units (and / or i slot units) can be organized as follows, for L = (15360k - 16k) / N

[0511] When

[0512] Q = floor(i / N), (Q is a negative integer, 0, or a positive integer),

[0513] R = (i mod N), (R = 0, 1,..., N - 1).

[0514] FIG. 15 is a diagram illustrating an example of slot shifting according to various embodiments.

[0515] Referring to FIG. 15 As described above, unlike other slots, the length of 16k is added to the first slot within each 0.5 ms, and thus, in shifting the N slots constituting each 0.5 ms, a difference can occur depending on which slot is aligned at the time of shifting (depending on the reference time position of slot shifting). For example, in the case (a) of shifting while aligning the beginning of the first slot among the N slots constituting each 0.5 ms with the slot boundary of the reference cell, when shifting by 1 slot to the right / left, the added length of 16k can be located to the left with respect to the beginning of the slot of the reference cell. On the other hand, in the case (b) of shifting while aligning the end of the first slot (and / or the beginning of the last slot) among the N slots with the slot boundary of the reference cell, when shifting by 1 slot to the right / left, the added length of 16k can be located to the right with respect to the end of the slot of the reference cell.

[0516] [Method 1]

[0517] According to various embodiments, shifting can be based on shifting alignment of the end of the last slot among the N slots constituting each 0.5 ms and / or based on shifting alignment of the beginning of the first slot among the N slots constituting each 0.5 ms.

[0518] FIG. 16 is a diagram illustrating an example of slot shifting according to various embodiments.

[0519] According to various embodiments, the shifting can be based on the shifting alignment of the end of the last slot constituting N slots of each 0.5 ms and / or based on the shifting alignment of the start of the first slot constituting N slots of each 0.5 ms. According to various embodiments, the reference time position for slot shifting can be the start of the first slot and / or the end of the last slot within 0.5 ms.

[0520] In the description of various embodiments, L may mean a length obtained by dividing a remaining length obtained by subtracting 16k from 0.5 ms into four equal parts, that is, a length in which the remaining length is divided into four equal parts, in the case of 120 kHz SCS. For convenience, 2 L , 4 L of 60 kHz SCS, 30 kHz SCS, and 15 kHz SCS can be indicated.

[0521] According to various embodiments, L can be a value determined according to SCS, for 60 kHz SCS, a slot length is 16k+L(=S=16k+2 L ), and / or L(2 L ), for 30 kHz SCS, a slot length is 16k+L(=S=16k+4 L ), and for 15 kHz SCS, a slot length can be 2*(16k+L(=2*(16k+4 L ).

[0522] Referring to FIG. 16 , the reference unit for slot shifting can be a slot for 15 kHz SCS / a slot for 30 kHz SCS / a slot for 60 kHz SCS / a slot for 120 kHz SCS. According to various embodiments, since the slot length in the time domain varies according to SCS, the actual shifting length in the time domain can vary according to the reference SCS.

[0523] – for example, in the case of a slot for 15 kHz SCS -> ①: (16k+4 L )*2

[0524] – for example, in the case of a slot for 30 kHz SCS -> ①: 16k+4 L

[0525] – for example, in the case of a slot for 60 kHz SCS -> ①: 16k+2 L , ②: 2 L

[0526] – for example, in the case of a slot for 120 kHz SCS -> ①: 16k+L , ②: L

[0527] In FIG. 16 , the length of the slot boundary shown for the slot shift can be expressed as ①, ②, ②, ②.

[0528] According to various embodiments, FIG. 16 the slot shift exemplified in the above can be performed based on a shift alignment of the end of the last slot among N slots constituting each 0.5 ms and / or based on a shift alignment of the beginning of the first slot among N slots constituting each 0.5 ms.

[0529] For example, when shifted to the right in the time domain in a 60 kHz SCS, after shifting by a length corresponding to ① (16k+2 L ), it can be shifted 0 to 1 times by a length corresponding to ② (2 L ).

[0530] For example, when shifted to the left in the time domain in a 60 kHz SCS, after shifting 0 to 1 times by a length corresponding to ② (2 L ), it can be shifted by a length corresponding to ① (16k+2 L ).

[0531] For example, when shifted to the right in the time domain in a 120 kHz SCS, after shifting by a length corresponding to ① (16k+ L ), it can be shifted 0 to 3 times by a length corresponding to ② ( L ).

[0532] For example, when shifted to the left in the time domain in a 120 kHz SCS, after shifting 0 to 3 times by a length corresponding to ② ( L ), it can be shifted by a length corresponding to ① (16k+ L ).

[0533] According to FIG. 17 , a slot including 16k can be located at the front (the foremost) within 0.5 ms. As another example, the length of the slot boundary shown for the slot shift can be shown as ②, ②, ②, ①, etc., in which case a slot including 16k can be located at the rear (the last) within 0.5 ms.

[0534] Hereinafter, a slot boundary alignment method according to a relationship between a slot length of an SCell and a slot length of a PCell will be described in various embodiments.

[0535] A-1

[0536] According to various embodiments, when the slot length of the SCell is less than or equal to the slot length of the PCell (when the slot length of the SCell is less than or equal to the slot length of the PCell), the boundary alignment can be performed based on the end of a slot. For example, aligning the end of the last slot among N slots constituting each 0.5 ms while shifting can be one standard.

[0537] B-1

[0538] According to various embodiments, when the slot length of the SCell is greater than the slot length of the PCell (when the slot length of the SCell exceeds the slot length of the PCell), the boundary alignment can be performed based on the end of a slot. For example, aligning the end of the last slot among N slots constituting each 0.5 ms while shifting can be one standard.

[0539] A-2

[0540] According to various embodiments, when the slot length of the SCell is less than or equal to the slot length of the PCell (when the slot length of the SCell is less than or equal to the slot length of the PCell), the boundary alignment can be performed based on the start of a slot. For example, aligning the start of the first slot among N slots constituting each 0.5 ms while shifting can be one standard.

[0541] B-2

[0542] According to various embodiments, when the slot length of the SCell is greater than the slot length of the PCell (when the slot length of the SCell exceeds the slot length of the PCell), the boundary alignment can be performed based on the start of a slot. For example, aligning the start of the first slot among N slots constituting each 0.5 ms while shifting can be one standard.

[0543] According to various embodiments, when instructed / directed to shift by i slot units (and / or i slot units), when i (after taking the absolute value of i, not expressed as left shift and right shift) is negative, it can be interpreted as left shift, when i is positive, it can be interpreted as right shift, and when i is 0, it can be interpreted as no shift. That is, according to various embodiments, the direction of shift in the time domain can be indicated / configured according to the indicated sign of i.

[0544] According to various embodiments, it can be expressed as i = Q*N + R, where N can be the number of slot units within 0.5 ms, Q can be an integer (negative, 0, positive) value, and R can be a remainder satisfying 0 =< R < N. According to various embodiments, after shifting Q*(16k+N*L) by Q (if Q is negative, it can be shifted to the left, if Q is positive, it can be shifted to the right, and if Q is 0, it can not be shifted), R generates only an additional right shift because the remainder is always R >= 0.

[0545] According to various embodiments, in the case of right shifting R, in all cases of A-1, B-1, A-2, and B-2, the number of samples of the shifted slot is 16k*[1-delta(R)]+R*L), so it can not be necessary to distinguish.

[0546] That is, according to various embodiments, in the cases of A-1, B-1, A-2, and B-2, the total number of samples in the shifted slot can be expressed as one equation Q*(16k+N*L)+(16k*[1-delta(R)]+R*L) (for R=0,1,...,N-1), where if R=0, delta(R)=1 and if R≠0, delta(R)=0.

[0547] According to various embodiments, in the cases of A-1, B-1, A-2, B-2, the total number of samples in the shifted slot can be expressed as follows:

[0548] Q=floor(i / N), (Q is a negative integer, 0, or a positive integer)

[0549] R=(i mod N), (R=0,1,...,N-1)

[0550] According to various embodiments, in the case of normal CP, the number of samples (N shift_samples ) to be shifted can be expressed as follows:

[0551] N shift_samples =Q*(16k+N*L)+(16k*[1-delta(R)]+R*L)

[0552] =floor(i / N)*(16k+N*L)+(16k*[1-delta(i mod N)]+(i mod N)*L)

[0553] = i*L+(floor(i / N)+[1-delta(i mod N)])*16k

[0554] In addition, the above-described various embodiments and effects are the same, but when there is a difference in the formula for calculating Q and R according to i time slot units (here, i = -M,..., M-1), the formula according to the various embodiments will be described. For example, the corresponding formula can be the same as the following Equation 4.

[0555] [Equation 4]

[0556] SCS index for 15kHz, 30kHz, 60kHz, 120kHz: μ = {0, 1, 2, 3}

[0557] Number of slots within 0.5ms N = 2 μ-1

[0558] Slot offset index: i = -M,..., M-1 where M = 5*2 μ / 2

[0559] Slot length:

[0560] If N ≠ 1 / 2,

[0561] 16k + L or L where S = (16k + N*L) for normal CP

[0562] L where S = N*L for extended CP

[0563] If N = 1 / 2,

[0564] 2*S where S = (16k + L) for normal CP

[0565] 2*S where S = L for extended CP

[0566] Number of samples for slot shifting:

[0567] If N ≠ 1 / 2,

[0568] N shift_samples = Q*S + 16k*[1-delta(R)] + R*L for normal CP

[0569] N shift_samples = Q*S + R*L for extended CP

[0570] where Q = floor((M + i) / N) - floor(M / N)

[0571] R = mod((M + i) / N) - mod(M / N)

[0572] delta(R) = 1 if R = 0 and delta(R) = 0 if R ≠ 0

[0573] If N = 1 / 2,

[0574] N shift_samples = Q * S

[0575] where Q = M / N

[0576] The formula according to the above-described various embodiments can be applied to the various embodiments described below and other various embodiments.

[0577] [Method 2]

[0578] FIG. 17 is a diagram exemplifying an example of slot shifting according to various embodiments.

[0579] According to various embodiments, shifting can be made based on alignment of the end of the first slot among N slots constituting each 0.5 ms. According to various embodiments, the reference time position for slot shifting can be the end of the first slot within 0.5 ms.

[0580] In the description of various embodiments, L may mean a length obtained by dividing a remaining length obtained by subtracting 16k from 0.5 ms by four, that is, a length corresponding to the remaining length divided by four. For convenience, 2 L , 4 L of 60 kHz SCS, 30 kHz SCS, and 15 kHz SCS can be indicated.

[0581] In the description of various embodiments, L can be a value determined according to SCS, and in the case of 60 kHz SCS, the slot length can be 16k+L (= 16k+2 L ) and / or L (2 L ), in the case of 30 kHz SCS, the slot length can be 16k+L (= 16k+4 L ), and in the case of 15 kHz SCS, the slot length can be 2*(16k+L) (= 2*(16k+4 L ).

[0582] Referring to FIG. 17 , the reference unit for slot shifting can be a slot for 15 kHz SCS / a slot for 30 kHz SCS / a slot for 60 kHz SCS / a slot for 120 kHz SCS. According to various embodiments, since the slot length in the time domain varies according to SCS, the actual shifting length in the time domain can vary according to the reference SCS.

[0583] – for example, in the case of a slot for 15 kHz SCS -> ①: (16k+4L)*2

[0584] - For example, in case of 30 kHz SCS slot -> ①: 16k+4L

[0585] - For example, in case of 60 kHz SCS slot -> ①: 16k+2L, ②: 2 L

[0586] - For example, in case of 120 kHz SCS slot -> ①: 16k+L, ②: L

[0587] In FIG. 17 , the length of the slot boundary shown for the slot shift can be expressed as ①, ②, ②, ②.

[0588] According to various embodiments, FIG. 18 The slot shift exemplified in can be performed based on a shift alignment of an end of a last slot among N slots constituting each 0.5 ms and / or based on a shift alignment of a start of a first slot among N slots constituting each 0.5 ms and / or based on a shift alignment of an end of a first slot among N slots constituting each 0.5 ms.

[0589] For example, when 60 kHz SCS is a reference SCS, (a) slot shift can be performed based on a shift alignment of an end of a last slot among two slots constituting each 0.5 ms and / or based on a shift alignment of a start of a first slot among two slots constituting each 0.5 ms, and (b) slot shift can be performed based on a shift alignment of an end of a first slot among two slots constituting each 0.5 ms. For example, in case of (a), a +16k difference with respect to a slot boundary before the shift can be located at an end of a first slot among two slots, and in case of (b), a +16k difference with respect to a slot boundary before the shift can be located at a start of a first slot among two slots.

[0590] For example, when 120 kHz SCS is a reference SCS, (c) slot shift can be performed based on a shift alignment of an end of a last slot among 4 slots constituting each 0.5 ms and / or based on a shift alignment of a start of a first slot among 4 slots constituting each 0.5 ms, and (e) slot shift can be performed based on a shift alignment of an end of a first slot among four slots constituting each 0.5 ms. For example, in case of (c), a +16k difference with respect to a slot boundary before the shift can be located at an end of a first slot among 4 slots, and in case of (e), a +16k difference with respect to a slot boundary before the shift can be located at a start of a first slot among four slots.

[0591] On the other hand, for example, (d) can perform slot shifting based on shift alignment based on the end of the last slot among 4 slots constituting each 0.5 ms and / or slot shifting based on shift alignment based on the beginning of the first slot among 4 slots constituting each 0.5 ms and slot shifting combination / mixing based on shift alignment based on the end of the first slot among 4 slots constituting each 0.5 ms.

[0592] A-1

[0593] According to various embodiments, when the slot length of the SCell is equal to or smaller than the slot length of the PCell, a method of performing boundary alignment based on the end of a slot can be provided, and alignment by shifting the end of the first slot among N slots constituting each 0.5 ms can be referred to.

[0594] B-1

[0595] According to various embodiments, when the slot length of the SCell is greater than the slot length of the PCell, a method of performing boundary alignment based on the end of a slot can be provided, and alignment by shifting the end of the first slot among N slots constituting each 0.5 ms can be referred to.

[0596] According to various embodiments, when instructed / instructed to shift i slot units (and / or i slot units), if i (after taking the absolute value of i, not expressed as left shift and right shift) is negative, it can be interpreted as left shift, if i is positive, it can be interpreted as right shift, and if i is 0, it can be interpreted as no shift. That is, according to various embodiments, the direction of shift in the time domain can be indicated / configured according to the indication sign of i.

[0597] According to various embodiments, it can be expressed as i = Q*N + R, where N can be the number of slot units within 0.5 ms, Q can be the quotient when i is divided by N and has an integer (negative, 0, positive) value, and R can be a remainder satisfying 0 =< R < N. According to various embodiments, after shifting by Q*(16k+N*L) in Q (if Q is negative, it can be shifted to the left, if Q is positive, it can be shifted to the right, and if Q is 0, it can not be shifted), because the remainder is always R >= 0, R only generates an additional right shift.

[0598] According to various embodiments, right shift R can be:

[0599] - R*L in the case of A-1.

[0600] - In case of B-1, when M is the number of slots corresponding to the slot length of the SCell (strictly speaking, the ratio of the PCell SCS (2^mμ_p) to the SCell SCS (2^mμ_s) since the slot length of the SCell is long, that is, M = 2^(mμ_p) / 2^(mμ_s)), if 0 <= R <= (N-M), it can be R*L, and if (N-M) < R < N, it can be 16k+R*L.

[0601] In summary, according to various embodiments, the total number of samples to be shifted

[0602] can be expressed as:

[0603] - In case of A-1, Q*(16k+N*L)+R*L

[0604] - In case of B-1, if 0 <= R <= (N-M), it is Q*(16k+N*L)+R*L, and if (N-M) < R < N, it is Q*(16k+N*L)+(16k+R*L); (M = 2^(mμ_p) / 2^(mμ_s))

[0605] For example, the above equation can be expressed in another form as follows.

[0606] Q = floor(i / N), (Q is a negative integer, 0, or a positive integer)

[0607] R = (i mod N), (R = 0, 1,..., N-1)

[0608] According to various embodiments, in case of normal CP, the number of samples (N shift_samples ) to be shifted can be expressed as follows:

[0609] (1) In case of A-1:

[0610] N shift_samples = Q*(16k+N*L)+R*L

[0611] = floor(i / N)*(16k+N*L)+(i mod N)*L

[0612] = i*L+floor(i / N)*16k

[0613] (2) In case of B-1:

[0614] N shift_samples = Q*(16k+N*L)+R*L if 0 <= R <= N-M

[0615] = floor(i / N) * (16k + N*L) + (i mod N) * L

[0616] = i*L + floor(i / N) * 16k

[0617] N shift_samples = Q * (16k + N*L) + (16k + R*L) if (N-M) < R < N

[0618] = floor(i / N) * (16k + N*L) + (i mod N) * L

[0619] = i*L + (floor(i / N) + 1) * 16k

[0620] (M = 2(mup - mus))

[0621] On the other hand, the above various embodiments can be the number of samples to be shifted with respect to a slot having a normal CP (normal slot). For example, in the case of a slot having an extended CP (extended slot), there can be no portion corresponding to 16k of the normal slot.

[0622] For example, N_ext is the number of extended slot units within 0.5 ms, L_ext is the number of samples constituting an extended slot unit, and it is said that the slot unit of the extended slot can be defined on the same principle as in the case of the normal slot.

[0623] According to various embodiments, the total number of samples to be shifted can always be expressed as one formula as follows:

[0624] N shift_samples = Q * N_ext * L_ext + R * L_ext

[0625] According to various embodiments, in the case of an extended CP, the number of samples to be shifted (N shift_samples ) can be expressed as follows:

[0626] N shift_samples = Q * N_ext * L_ext + R * L_ext

[0627] = floor(i / N_ext) * N_ext * L_ext + (i mod N) * L_ext

[0628] = i * L_ext

[0629] FIG. 18 FIG. is a diagram illustrating an example of slot shifting according to various embodiments.

[0630] According to various implementation methods, information about time slot offset can be sent / received based on the value of the reference SCS in carrier aggregation, and the information about time slot offset can indicate the time slot offset between PCell / PSCell and SCell. The UE can determine the time offset of SCell based on the information about time slot offset.

[0631] According to various implementations, the reference SCS can be associated with a unit indicating the time offset, and the reference time boundary can be associated with which cell's time boundary is applied as the time offset based on the reference time boundary.

[0632] For example, refer to FIG. 18 (a) and FIG. 18 (c) The reference cell is configured with a 120kHz SCS, and the SCell is configured with a 60kHz SCS. When the reference SCS is determined to be 60kHz, the slot offset can be indicated according to the unit corresponding to the reference SCS. For example, the UE can obtain / determine the slot boundary of the target cell based on the slot boundary of the reference cell configured with a 120kHz SCS, or based on slot shifts performed in the order of 16k+L->L or L->16k+L by applying the indicated slot offset based on the 60kHz SCS.

[0633] For example, refer to FIG. 18 (b) and Embodiment A In (d), the reference cell is configured with a 120kHz SCS, and the SCell is configured with a 60kHz SCS. When the reference SCS is determined to be 120kHz SCS, the slot offset can be indicated according to the unit corresponding to the reference SCS. For example, the UE can obtain / determine the slot boundary of the target cell based on the slot boundary of the reference cell configured with a 120kHz SCS, or based on slot shifts performed in the order of 16k+L->L or L->16k+L by applying the indicated slot offset based on the 120kHz SCS.

[0634] For example, the start of time slot 0 for the target cell can coincide with the start of time slot N for the reference cell. For example, N can be determined based on the time slot offset and the reference SCS.

[0635] Symbol alignment

[0636] Methods for implementing symbol alignment according to various implementation methods will be described.

[0637] For example, if time slot alignment is achieved, there can be methods for achieving symbol alignment and methods for not achieving symbol alignment in this case.

[0638] For example, when the time slot length of the shifted cell is longer (compared to the time slot length of the reference cell), when the time slot index is shifted by -ceil(i / M) and remains unchanged until re-indexing, then the sample shift is additionally performed by a fraction of -r*L or -(16k+r*L):

[0639] Method a) and method b) and the like can be performed,

[0640] - Method a) a method of making the CP of the middle symbol in a time slot longer than the CP of the other symbols by fixing the 16k sample part to the original position

[0641] - Method b) a method of making the CP length of the first symbol (CP of the symbol located after 0.5 ms, wherein the first symbol is in the time slot of the cell of 15 kHz SCS) longer than the CP of the other symbols by shifting the 16k sample part to the first symbol of the time slot

[0642] And for example, for method b), there can be two options as follows.

[0643] For example, after the time slot index is re-indexed, for the shifted cell, the original time slot 0 (time slot with index 0) can become time slot (-ceil(i / M)) (time slot with index (-ceil(i / M))), and the original time slot (ceil(i / M)) (time slot with index (ceil(i / M))) can be changed to time slot 0, in addition, when the long symbol in the sample is shifted to the first symbol:

[0644] -(1) The changed time slot 0 can be aligned with the time slot boundary of the reference cell. And / or;

[0645] -(2) The changed time slot (-ceil(i / M)) (i.e., the original time slot 0) can be aligned with the time slot boundary of the reference cell.

[0646] In order to discuss method a), method b), and / or time slot alignment, symbol alignment, and the like according to various embodiments, some concepts can be summarized.

[0647] For example, samples can be combined to form symbols, 14 symbols can be combined to form a time slot, and time slots can be combined to form a frame.

[0648] For example, unlike the case of fixed timing, when timing shift occurs, these samples, symbols, time slots, frames, and the like can be interpreted as two different concepts:

[0649] - Concept 1: For example, each sample group configured with zero timing shift can be a symbol itself, each symbol group consisting of 14 symbols can be a slot itself, and each slot group can be a frame itself. For example, symbol indices of 0, 1,..., 13 can be assigned from the first symbol to each symbol group. For example, in this case, shifting i slots can mean that all symbols corresponding to the slots are shifted by a length corresponding to 14*i symbols, and all samples corresponding to the symbols are shifted by the length.

[0650] - Concept 2: For example, an upper layer group can just be a container including a group of sub-elements. That is, for example, in the relationship between samples and symbols, samples can be elements, and symbols can be containers including a group of sample elements. For example, in the relationship between symbols and slots, symbols can be elements, slots can be containers including a group of symbol elements. For example, in the relationship between slots and frames, slots can be containers including elements, and frames can include a group of slot elements. For example, each symbol group can consist of 14 symbols, and symbol indices of 0, 1,..., 13 can be assigned from the first symbol of the slot. For example, in this case, shifting i slots can mean that symbols corresponding to the slots are left as they are in their original timing, and after a container called only a slot that can accommodate 14 symbols is shifted by 14*i symbols at the symbol granularity, 14 symbols located within the start and end boundaries of the container are put into a new container and belong to the slot. For example, at this time, the slot index of the corresponding container can be assigned to the 14 symbols included in the shifted container by re-indexing the symbol indices of 0, 1,..., 13 from the first symbol in the container. For example, this can be a method for shifting only the slots corresponding to the container without shifting the timing of the symbols and samples at all in preparation for shifting to 0, and can correspond to method a).

[0651] When the length of the shifted cell is equal to or less than the length of the slot unit, the method according to the various embodiments described above can be clearly applied. Hereinafter, various embodiments including a general case in which the length of the shifted cell is greater than the slot unit will be described.

[0652] In the description of various embodiments, similar to defining a slot determined by a reference SCS as a slot unit, a symbol determined by the same reference SCS can be defined as a symbol unit.

[0653] According to various embodiments, for non-shifted timing, a first symbol unit occurring every 0.5 ms can have a CP length of 16k longer than other symbol units. For example, a first symbol unit in the time domain every 0.5 ms can have a CP length of 16k longer than other symbol units.

[0654] According to various embodiments, when the slot unit is 1 ms (the length of the slot corresponds to SCS = 15 kHz, i.e., greater than 0.5 ms) and / or when the slot unit is greater than the shifted slot length, shifting i slot units can mean that all samples are shifted by 14*i symbol units.

[0655] For example, in the case contrary to the above example (that is, the length of the slot unit is less than or equal to 0.5 ms, and the length of the slot unit is equal to or less than the slot length of the shifted cell), it can be assumed that M is the number of slot units included in one slot of the shifted cell. According to various embodiments, shifting i slot units can mean that "slot containers" are shifted by 14*i symbol units in a symbol unit granularity, in which samples and / or symbol units (i.e., elements) are fixed in the original timing. According to various embodiments, each of the shifted containers can exactly include 14*M symbol units.

[0656] According to the method a) based on various embodiments, 14 "symbol containers" can be generated by combining M symbol units from the first symbol unit in the "slot container" to integrate them into one symbol. For example, the slot index of the "slot container" can be assigned to the 14 symbols obtained by integrating in this way, and can be re-indexed in a manner in which symbol indices 0, 1,..., 13 are assigned from the first symbol.

[0657] According to the method a) based on various embodiments, both slot alignment and symbol alignment can be perfectly maintained in the shifted cell with respect to the timing of the reference cell, and the symbol having a longer CP than the other symbols in the slot can not be the symbol corresponding to the symbol index 0.

[0658] According to the method a) based on various embodiments, shifting i slot units can mean that samples and / or symbols (i.e., elements) are fixed in the original timing without shifting, and "slot containers" and "symbol containers" are shifted by 14*i symbol units (symbols determined by the reference SCS) in a symbol unit granularity. For example, the "symbol container" of the shifted cell can be a container including M consecutive symbol units, and the "slot container" can be a container including 14*M symbol units.

[0659] According to various embodiments, M symbol units belonging to the "symbol container" can be integrated to form one symbol (element) after being shifted. For example, 14 symbols (elements) consisting of 14*M symbol units in the "slot container" can constitute one slot after being shifted.

[0660] According to various embodiments, for the overall method according to Concept 2, as the slot container and / or symbol container is shifted, the length of the elements belonging to the container can change by 16k samples, so the length of the container is variable, but the slot index and / or symbol index assigned to the slot container and / or symbol container before the shift can be maintained even after the shift.

[0661] According to various embodiments, the samples, symbols, slots, and frame elements can be fixed in their original timing, and since only the containers are shifted, the size of the container is slightly variable ((about) ±16k) so that it exactly matches the length of the new elements belonging to the container, the concept can be implemented by the concept of shifting only the indices of the symbols, slots, and frames at the time of shifting.

[0662] The method a) of shifting the containers referred to as frames and / or the containers referred to as slots and / or the containers referred to as symbols according to various embodiments is described below based on the index shift concept:

[0663] According to various embodiments, when the number of slots of a cell (e.g., SCell) to be shifted within a 10 ms frame is K and the number of slot units corresponding to one slot of the cell to be shifted is M, in a frame based on a non-shifted fixed time, there can be K*M slot units of slot unit indices s=0, 1,..., K*M-1 starting from the first slot unit.

[0664] According to various embodiments, since there are 14 symbol units (which have symbol unit indices 0, 1,..., 13) in each slot unit, there can be 14*K*M symbol units in one frame. According to various embodiments, the symbol unit virtual indices n=0, 1,..., 14K*M-1 can be assigned to the symbol units from the first symbol unit.

[0665] According to various embodiments, the cell timing offset i slot units can be implemented as follows:

[0666] - First, the slot unit index j can be changed to floor(((j-i) mod(K*M)) / M)

[0667] -- Then, the K*M slot units in one frame can have one of the indices from 0 to K-1 by index change, and the consecutive M slot units can have the same index.

[0668] -- The M consecutive slot units having the same index can be integrated to form one slot, and the index (e.g., the same index assigned to the consecutive M slot units) can be assigned as the slot index of the slot.

[0669] -- Next, the symbol unit virtual index n can be changed to floor(((n-14*i)mod(14*K*M)) / M)

[0670] -- Then, 14*K*M symbol units in one frame can have values having one of indexes from 0 to (14*K-1) by index change, and M consecutive symbol units can have the same index.

[0671] -- M consecutive symbol units having the same index are integrated to be one symbol, and (index mod 14) calculated / obtained from the corresponding index (the same index assigned to the consecutive M symbol units) can be assigned as a symbol index of the symbol.

[0672] - Finally, a shifted frame consists of consecutive K slots starting from a slot having a new slot index 0, and a shifted slot can consist of 14 consecutive symbols starting from a symbol having a new symbol index 0.

[0673] According to the method b) based on various embodiments, a symbol unit element and a container (that is, a symbol unit itself determined by a reference SCS and a corresponding "symbol unit (called) container") are shifted (for example, a negative shift can mean a shift to the left by a symbol unit granularity (in the time domain)) -14*(ceil(i / M)*M-i) symbol units, in which a "slot container" is shifted, and then 14 symbols can be generated based on 14*M symbol unit containers contained in the shifted "slot container" starting from the first symbol unit container being bundled in groups of M to integrate them into one symbol.

[0674] According to various embodiments, a slot index of a "slot container" can be given to a symbol obtained / obtained by integration, and can be re-indexed in a manner of assigning symbol indexes 0, 1,..., 13 from the first symbol.

[0675] According to the method b) based on various embodiments, in order to prepare a shifted cell for the timing of a reference cell, symbol alignment can not be normally maintained / implemented, but slot alignment can be perfectly maintained / implemented, and the principle of always keeping a symbol in which a CP is longer than other symbols in a slot as symbol 0 (a symbol having an index of 0) can also be maintained.

[0676] According to the method of integrating into a slot and / or symbol length of a shifted cell (for example, an SCell) after only shifting the indexes of the slot unit and the symbol unit according to various embodiments, because the SCell frame structure is different from TS 38.211 or the like, there can be a problem in lower level compatibility and / or capability when a UE is configured for slot alignment with another PCell and / or a slot shifted SCell is configured as a PCell, and it can be necessary to be supplemented.

[0677] For example, for a UE supporting a wireless communication system to which various embodiments are applicable (e.g., NR Rel. 16), an indication that a frame structure has changed can be signaled through slot offset signaling itself even when carrier aggregation is not configured, and the UE supporting the wireless communication system to which various embodiments are applicable can interpret the corresponding signaling as the above-mentioned meaning. For example, the UE supporting the wireless communication system to which various embodiments are applicable can interpret the slot offset signaling as an indication that the frame structure has changed.

[0678] In addition, for example, information about how many symbol / slot units are shifted compared to a non-carrier aggregation cell and / or a PCell and / or a PSCell and / or without shifting and / or compared to a basic frame structure can be signaled.

[0679] For example, the information can be indicated in an SIB (e.g., SIB1) and / or a UE-specific RRC signal with SFI (slot format index / slot format indicator) related information. And / or, for example, considering the payload of an SIB and / or a UE-specific RRC signal, etc., a binary 1-bit flag can be utilized to know / indicate whether it is a basic frame structure, and when the UE knows through the flag that the (frame) structure is not a basic structure, it can know the frame structure based on reading the RRC signaling (by decoding the RRC signaling / according to the RRC signaling) and obtaining a shift length value.

[0680] For example, there can be a question about whether the system / UE will not operate due to no signaling (related to the structure), and there is a 0.52 µs understanding difference between CP transceivers.

[0681] For example, due to the CP, there can be a problem that causes a decrease in coverage and a decrease in performance, but whether or not to perform the operation itself can vary for each case. For example, if the problems that occur in the case of no signaling are ranked in order of severity, it can be as follows:

[0682] -1) For time offset-based shifting, if it is limited to shifting 0.5 ms, there can be no problem in all cases. For example, in this case, slot alignment and symbol alignment can be maintained, and a limited granularity of 0.5 ms can be implemented.

[0683] -2) In the case of method b) according to various embodiments, (since channel estimation and / or beamforming are independently performed in units of slots), there can be no problem in the operation itself (a problem of not operating). For example, in this case, slot alignment can be maintained, and a fine granularity in units of slot units can be implemented.

[0684] -3) In method a) according to various embodiments, when the index is changed only in time slot units, (that is, when the long symbol is always located in front in a symbol unit), (since channel estimation and / or beamforming are independently performed in time slot units), there can be no problem in the operation itself (whether or not the problem of non-operation). For example, in this case, when the time slot length of a shifted cell (e.g., SCell) is less than or equal to the time slot length of a reference cell (e.g., PCell / PSCell) and / or when the time slot of the shifted cell is longer than the time slot of the fixed unit, there can be a case where shifting is allowed only in a time slot length unit of the shifted cell by imposing a restriction on the shiftable grid. In this case, time slot alignment can be maintained and (slightly) limited granularity per time slot can be achieved.

[0685] -4) In method a) according to various embodiments, when the time slot of the shifted cell is longer than the time slot of the fixed cell, when the index is changed in a time slot unit, the structure is changed according to a symbol unit within the time slot, and since there is no restriction on the shiftable grid, there can be a time slot in which 0.52 µs is placed in the middle of the time slot. For example, in this case, the amount of phase change in the time slot is different from the case of the basic structure, and since the channel changes quickly in the time slot, there can be a result of applying / allocating two different channels in which the boundary is located somewhere in the middle symbol of the time slot. That is, for example, one channel estimation value and one beamforming value can not be estimated for the time slot. For example, in this case, although the impact on network / UE operation can vary depending on the implementation of the channel estimator, until the structure information is known or indicated by signaling, channel estimation needs to be performed in a symbol unit, not in a time slot unit, and the performance of the corresponding time slot is definitely degraded. For example, in this case, time slot alignment and symbol alignment can be maintained, and fine granularity in a time slot unit can be achieved.

[0686] Signaling (structure related) according to various embodiments can be complementary to the above 4). For example, although in the case of 1)-3) (structure related), signaling can or can not be transmitted / received between the network and the UE, in the case of 4) (structure related), it can be necessary to transmit / receive signaling between the network and the UE.

[0687] Greater SCS time slot shifting unit

[0688] According to various embodiments, a greater SCS time slot shifting unit can be indicated in an N times unit (e.g., N is a value obtained by dividing the larger value of the PCell / PSCell SCS and the SCell SCS by the smaller value).

[0689] And / or, according to various embodiments, a larger SCS slot shift unit can be indicated in units of N (e.g., N is a value obtained by dividing the SCS of the shifted slot by 30kHz SCS) regardless of any SCS, to always fit the unit of 0.5ms.

[0690] And / or, according to various embodiments, when the SCS of the PCell / PSCell and the SCell is greater than 30kHz (e.g., 60kHz, 120kHz), a larger SCS slot shift unit can be indicated in units of N (e.g., N is the SCS of the shifted slot divided by 30kHz SCS) to fit the unit of 0.5ms. For example, when the shifted slot corresponds to 60kHz SCS, it can be indicated as a multiple of 2, and when the shifted slot corresponds to 120kHz SCS, it can be indicated as a multiple of 4.

[0691] Definition of slot offset

[0692] According to various embodiments, for inter-band carrier aggregation, carrier aggregation with unaligned frame boundary with slot alignment and partial SFN alignment can be provided. Specific operation examples of CA operation with frame boundary unalignment according to various embodiments can be as follows:

[0693] - For example, in carrier aggregation with unaligned frame boundary with slot alignment and partial SFN alignment, the slot offset can be configured / indicated by explicit RRC signaling to the UE.

[0694] - For example, the slot offset for a CC (and / or serving cell) can be defined for the PCell / PSCell timing, and the slot offset can be the slot offset between the PCell / PSCell and the SCell, and the slot granularity (and / or the reference SCS used to indicate the slot offset) can be defined / determined as follows.

[0695] - Alt.1: the maximum SCS among the lowest SCS among all configured SCS (corresponding to DL / UP BWP) of the PCell / PSCell and the lowest SCS among all configured SCS (corresponding to DL / UP BWP) in the CC. That is, the maximum SCS among the lowest SCS among the configured SCS for each of the PCell / PSCell and the SCell (the maximum among the lowest SCS among the configured SCS for the PCell / PSCell and the SCell).

[0696] --- Alt.2: 15 kHz when CC is FR1, and 60 kHz when CC is FR2

[0697] --- Alt.3: 60 kHz when CC is FR1, and 120 kHz when CC is FR2

[0698] --- Alt.4: 120 kHz

[0699] The Alts. (alternatives) according to various embodiments are examples of various embodiments, and the slot granularity (and / or the reference SCS for indicating the slot offset) can be defined / determined by other methods according to various other embodiments.

[0700] For example, the offset (e.g., slot offset) can always be signaled when it is not 0 for a UE indicated as supporting the relevant function.

[0701] For example, one slot shift right and one slot shift left can correspond to different samples.

[0702] For example, the offset range can be limited to ±76800Ts.

[0703] The method of Alt.1 of defining / determining the slot granularity for the offset indication according to various embodiments can be described in more detail as follows:

[0704] - A single value indicating the slot offset with slot granularity can be indicated as an RRC parameter for a given SCell.

[0705] - In the case of the slot offset N, the start of slot #0 of the CC (e.g., SCell) with a lower SCS (in the case of the same SCS, PCell / PScell) can coincide with slot #(qN mod M) of the CC (e.g., PCell / PScell) with a higher SCS (in the case of the same SCS, SCell).

[0706] -- q can be defined as follows.

[0707] --- q = -1 when the SCS of the PCell / PSCell is less than or equal to (less than or equal to) the SCS of the SCell.

[0708] --- In other cases, q = 1.

[0709] -- M can be the number of slots per frame of the CC with a higher SCS. For example, M can vary according to the SCS (reference SCS)

[0710] .

[0711] More specific operation examples of the carrier aggregation operation with misaligned frame boundaries according to the various embodiments can be as follows.

[0712] FIG. 19

[0713] According to the various embodiments, when the time slot offset is indicated, the time slot shifting method can have two solutions:

[0714] - First solution: 16k can always be located in front of time slot number #0 of the SCell.

[0715] - Second solution: The location of 16k can be changed so that the time slot boundary alignment can be maintained.

[0716] Referring back to Equation 1 and Equation 2 related to the OFDM symbol generation in the wireless communication system to which the various embodiments are applicable, 16k can be located in front of the first OFDM symbol in a subframe, and accordingly, when the time slot index of the SCell is shifted, the first solution that 16k is always located in front of time slot number #0 of the mobile cell can be considered.

[0717] In consideration of the fact that there is no restriction on the location of 16k that must be maintained in the wireless communication system to which the various embodiments are applicable, the second solution that the location of 16k can be changed to be in front of a time slot other than time slot number #0 of the mobile cell can be considered for strict time slot alignment.

[0718] FIG. 19 FIG. 1 is a diagram illustrating an example of time slot shifting according to the various embodiments.

[0719] Referring to FIG. 19 (a), an example of the first solution according to the various embodiments is illustrated. For example, 16k can always be located in time slot number #0 of the mobile cell even in the case of time slot shifting. For example, when qN=-2, the time slots of the SCell can be shifted by 2 time slots to the right in the time domain based on the time slots of the PCell / PSCell, and the start of time slot #0 of the PCell / PSCell can be shifted to align with the start of time slot #79 of the SCell.

[0720] Referring to FIG. 20 (b), an example of the first solution according to the various embodiments is illustrated. For example, 16k can be located in a time slot other than time slot number #0 of the SCell according to the change of the time slot index based on time slot shifting. For example, when qN=-2, the time slots of the SCell can be shifted by 2 time slots to the right in the time domain based on the time slots of the PCell / PSCell, and thus, 16k can be located in front of time slot number #2.

[0721] In a first solution according to various embodiments, the number of shifted samples can be determined based on Table 22. A more detailed description can also refer to the description of various embodiments described above.

[0722] [Table 22]

[0723]

[0724] In a second solution according to various embodiments, the slot index shift (re-numbering) and the number of shifted samples can be determined based on Table 23. A more detailed description can also refer to the description of various embodiments described above.

[0725] [Table 23]

[0726]

[0727] FIG. 21 is a diagram illustrating an example of slot shifting according to various embodiments.

[0728] FIG. 22 is a diagram illustrating an example of slot shifting according to various embodiments.

[0729] FIG. 20 to FIG. 22 is a diagram illustrating an example of slot shifting according to various embodiments.

[0730] FIG. 20 to FIG. 22 An example of slot shifting according to the first solution based on various embodiments can be illustrated.

[0731] Referring to FIG. 23 , according to the first solution based on various embodiments, when one or more of the SCS of the PCell / PSCell and the SCS of the SCell is less than or equal to (or less than) 30 kHz, the slot boundary can always be maintained (aligned) even through slot shifting. In addition, according to the first solution based on various embodiments, when both the SCS of the PCell / PSCell and the SCS of the SCell exceed 30 kHz, the slot boundary between the PCell / PSCell and the SCell can not be aligned. For example, one of the beginning of slot #0 of the SCell and the end of slot #0 can not be aligned with the beginning / end of the slot of the PCell / PSCell.

[0732] FIG. 23 is a diagram illustrating an example of slot shifting according to various embodiments.

[0733] FIG. 23 An example of slot shifting according to the second solution based on various embodiments can be illustrated.

[0734] Referring to Embodiment BAccording to a second solution based on various embodiments, allowing 16k location to be changed according to slot shift, so that slot boundaries can be aligned in all cases.

[0735] According to various embodiments, when a shifted slot has a longer slot duration (e.g., a slot corresponding to 15 kHz SCS and 30 kHz SCS), even if 16k is located in the first OFDM symbol of a subframe, the slot boundary between PCell / PSCell and SCell can be aligned.

[0736] According to various embodiments, when a shifted slot has a shorter slot period (e.g., a slot corresponding to 60 kHz SCS), when 16k location is allowed to be changed according to slot shift, the slot boundary between PCell / PSCell and SCell can be aligned.

[0737] In this regard, if both the SCS of PCell / PSCell and the SCS of SCell exceed 30 kHz, the second solution according to various embodiments can be a more preferred solution, however, various embodiments are not limited thereto, and even when both the SCS of PCell / PSCell and the SCS of SCell exceed 30 kHz, the first solution according to various embodiments can be applied.

[0738] Embodiment 1

[0739] According to various embodiments, when a given slot offset is given and the SCS of two cells is the same, the slot boundary of SCell can be aligned with the start of slot #0 of PCell / PSCell.

[0740] For example, assuming that cell 1 is PCell, cell 2 is SCell, the SCS of the two cells is the same, and 1 slot offset is placed in cell 2 compared to cell 1, the system can shift the timing of cell 2 to the right by L samples with respect to cell 1.

[0741] For example, when the network indicates 1 offset to the UE, the UE can align the slot boundary according to the same assumption that the timing of cell 2 is shifted to the right by L samples with respect to cell 1.

[0742] For example, from the perspective of cell 2, it can be seen that the slot boundary of cell 1 is shifted to the left by L samples in the time domain.

[0743] For example, assuming in the above case that both cell 1 and cell 2 are PCells for two UEs, if the above assumption for the slot offset applies to the UE for which cell 2 is a PCell as well, when the timing of cell 1 is shifted 16k+L samples to the left with respect to cell 2, the slot boundaries are aligned, and if the system applies the slot offset based on how cell 1 appears to be shifted L samples to the left, its UE for which cell 2 is a PCell can identify a different point in time than the slot boundary operated by the system as a slot boundary, and thus can need a solution for this.

[0744] Method 1

[0745] According to various embodiments, a specific cell serving as a reference for a slot boundary can be defined, and an offset can be defined / indicated based on the timing of the cell. For example, a cell-specific PCell / PSCell (and / or a network-specific PCell / PSCell and / or a system-specific PCell / PSCell) can be defined instead of a UE-specific PCell / PSCell, regardless of whether it is a PCell / PSCell or a SCell, and a shift can be defined / indicated based on the timing of the cell-specific PCell / PSCell.

[0746] Embodiment 1

[0747] For example, a slot offset between an SCell serving as a reference for a slot boundary and a cell can be indicated. For example, a slot offset between a cell-specific PCell / PSCell and an SCell can be indicated.

[0748] For example, since a slot offset can be generated between a PCell / PSCell and a cell serving as a reference for a slot boundary, a slot offset for the PCell / PSCell can be indicated. For example, since a slot offset can also be generated between a cell-specific PCell / PSCell and a (UE-specific) PCell / PSCell, a slot offset for the (UE-specific) PCell / PSCell can be indicated.

[0749] For example, a specific cell serving as a reference for a slot boundary can be named as an Rcell (reference cell), a PTcell (primary timing cell), a TPcell (timing primary cell), a timing (reference) PCell, a Tcell with reference timing 0 (Tcell with reference timing 0), etc.

[0750] Method 2

[0751] According to various embodiments, a signal and / or an alignment indicator (slot alignment indicator / slot indicator) indicating how to align a slot boundary can be introduced.

[0752] For example, according to a slot boundary used in the system, the network selects a slot boundary alignment method and indicates / configures the method to a receiver (e.g., a UE, an IAB DU (integrated access and backhaul distributed unit), an IAB MT (integrated access and backhaul mobile terminal), etc.).

[0753] For example, the receiver can receive the method according to the instruction / configuration to align the slot boundary.

[0754] Embodiment 2

[0755] For example, the following two slot boundary alignment methods can be configured / indicated by an indicator. For example, the indicator can configure / indicate one of the following two slot boundary alignment methods:

[0756] -1) Whether the start of slot 0 of the PCell / PSCell is aligned with the slot boundary of the SCell

[0757] -2) Whether the end of slot 0 of the PCell / PSCell is aligned with the slot boundary of the SCell

[0758] For example, the slot boundary alignment method according to 1) can be represented by the equation shown in Table 24.

[0759] [Table 24]

[0760]

[0761] Embodiment 3

[0762] For example, when a UE-specific PCell / PSCell and an SCell are configured, the indication can be made for each UE. For example, when the PCell informs of the slot offset of the SCell, the indicator can be transmitted as additional information (e.g., PBCH, SIB1, RRC, etc.).

[0763] Embodiment 4

[0764] For example, if the SCS of two cells is the same, at least one of embodiment 1 and / or embodiment 2 can be applied, and when the SCS of two cells is different, the size relationship between the SCS of two cells can be based on.

[0765] For example, when the slot offset of the SCell with respect to the PCell / PSCell is given as N (N is an integer):

[0766] - If the SCS of the PCell / PSCell is the same as the SCS of the SCell,

[0767] -- If the alignment indicator is configured to start alignment, the UE can assume that the start of slot 0 of the PCell / PSCell is aligned with the start of slot (-N mod M) of the SCell,

[0768] -- If the alignment indicator is configured to end alignment, the UE can assume that the end of slot 0 of the PCell / PSCell is aligned with the end of slot (-N mod M) of the SCell.

[0769] - Otherwise,

[0770] -- The UE can assume that the start of slot 0 of the cell with lower SCS is aligned with the start of slot (qN mod M) of the cell with higher SCS.

[0771] For example, M can be the number of slots in a frame in the (higher) SCS.

[0772] For example, the slot boundary alignment method according to Embodiment 3 can be expressed by the equation shown in Table 25.

[0773] [Table 25]

[0774]

[0775] Embodiment 5

[0776] For example, the above method of the PCell / PSCell always being the reference timing and indicating the slot offset alignment method can be applied regardless of the size relationship between the SCSs of the two cells (i.e., the size relationship between the slot lengths of the two cells).

[0777] For example, the boundary of the cell with long slots (compared to the other cell) can always be aligned with the boundary of the other cell, but in order to prevent the boundary of the cell with short slots (compared to the other cell) from being shifted to be located in the middle of the slot of the other cell, in this case, the allowed value of the slot shift can be limited to an integer multiple of the slot length of the cell with smaller SCS.

[0778] Embodiment 1

[0779] For example, when an indicator is needed, the indicator can be used to indicate the value of q. For example, the q value can be indicated by the alignment indicator.

[0780] Method 3

[0781] According to various embodiments, a frequency point (reference point / reference frequency point) for determining a reference cell / target cell can be defined / configured. According to various embodiments, at the start of slot 0 of a cell having a lower frequency point among two cells, a slot boundary (start) of a cell having a higher frequency point among the two cells can be aligned.

[0782] For example, whether PCell / PScell or SCell, at the start of slot 0 of a cell having a lower center frequency among two cells, a slot boundary (start) of a cell having a higher center frequency among the two cells can be aligned.

[0783] For example, whether PCell / PScell or SCell, at the start of slot 0 of a cell having a lower ARFCN among two cells, a slot boundary (start) of a cell having a higher ARFCN among the two cells can be aligned.

[0784] For example, whether PCell / PScell or SCell, at the start of slot 0 of a cell having a lower point A among two cells, a slot boundary (start) of a cell having a higher point A among the two cells can be aligned.

[0785] For example, when the SCS of two cells is the same, the above-described method can be applied, and when the SCS of two cells is different, according to a size relationship between the SCS of the two cells (i.e., a size relationship between the lengths of slots of the two cells), for example, the start of slot 0 of a cell having a longer slot length can be shifted so that the start of a slot boundary of a cell having a shorter slot length can be aligned.

[0786] For example, the slot boundary alignment method according to Method 3 can be expressed by the equation shown in Table 26.

[0787] [Table 26]

[0788]

[0789] Method 4

[0790] According to various embodiments, a frequency point (reference point / reference frequency point) for determining a reference cell / target cell can be defined / configured. According to various embodiments, at the start of slot 0 of a cell having a lower frequency point among two cells, a slot boundary (start) of a cell having a higher frequency point among the two cells can be aligned.

[0791] For example, at the beginning of slot 0 of the cell with the higher center frequency among the two cells, the beginning of the slot boundary of the cell with the lower center frequency among the two cells can be aligned, whether PCell / PScell or SCell.

[0792] For example, at the beginning of slot 0 of the cell with the higher ARFCN among the two cells, the beginning of the slot boundary of the cell with the lower ARFCN among the two cells can be aligned, whether PCell / PScell or SCell.

[0793] For example, at the beginning of slot 0 of the cell with the higher point A among the two cells, the beginning of the slot boundary of the cell with the lower point A among the two cells can be aligned, whether PCell / PScell or SCell.

[0794] For example, when the SCS of the two cells is the same, the above method can be applied, and when the SCS of the two cells is different, according to the size relationship between the SCS of the two cells (that is, the size relationship between the slot lengths of the two cells), for example, the beginning of slot 0 of the cell with the longer slot length can be shifted to align the beginning of the slot boundary of the cell with the shorter slot length. (And / or, for example, the beginning of slot 0 of the cell with the lower SCS can be shifted so that the beginning of the slot boundary of the cell with the higher SCS is aligned.)

[0795] For example, the slot boundary alignment method according to Method 4 can be represented by the formula shown in Table 27.

[0796] [Table 27]

[0797]

[0798] Method 5

[0799] According to various embodiments, as a modification example of Method 1, a slot offset indicator of each cell with respect to a reference timing (for example, each cell's own slot offset indicator) can be introduced.

[0800] For example, instead of the relative shift concept of SCell based on PCell / PSCell by N slots, for each cell, it can be indicated (through MIB / SIB1 / RRC, etc.) how many slots it is shifted from the virtual reference timing 0. At this time, for example, the beginning of slot #0 of the cell indicated as not shifted (that is, shifted by 0 slots) can be shifted so as to align with the beginning of the slot boundary of the other cell.

[0801] Embodiment 2

[0802] For example, when there are cell 1 and cell 2 in the system, it can be assumed that cell 1 is shifted by 0 slots (0 slot shift) and cell 2 is itself indicated to be shifted by N slots (N slot shift).

[0803] For example, it can be assumed that for UE 1, cell 1 is configured as PCell / PSCell and cell 2 is configured as SCell, and for UE 2, cell 2 is configured as PCell / PSCell and cell 1 is configured as SCell.

[0804] For example, for UE 1, since the PCell / PSCell is shifted by 0 slots and the SCell is shifted by N slots, UE 1 can assume / determine / identify that the SCell is shifted by N slots (shifted right by N slots) such that the start of slot (-N mod M) of the SCell aligns with the start of slot 0 of the PCell / PSCell.

[0805] On the other hand, for example, for UE 2, since the SCell is shifted by 0 slots and the PCell / PSCell is shifted by N slots, UE 2 can assume / determine / identify that the SCell is shifted by -N slots (shifted left by N slots) such that slot (-N mod M) of the PCell / PSCell aligns at the start of slot 0 of the SCell. For example, in the case of UE 2, the start of slot 0 of the PCell / PSCell can not always align with the start of slot (N mod M) of the SCell, and for example, there can be a difference of 16k on the slot boundary.

[0806] For example, in embodiment 1, when shifted by N slots, the shifted cell to be shifted can be predefined / determined as a reference slot unit (e.g., a slot corresponding to 120 kHz SCS).

[0807] Embodiment 3

[0808] For example, when the SCS of the two cells is the same, embodiment 1 can be applied, and when the SCS of the two cells is different (i.e., when the slot length of the two cells is different), it can be based on the size relationship between the SCS of the two cells (i.e., the size relationship between the slot length of the two cells). For example, the start of slot 0 of the cell with the longer slot can be shifted to align with the start of the slot boundary of the cell with the shorter slot.

[0809] Method 7-a)

[0810] For example, the method 5 according to various embodiments can also be applied to a slot shifting method based on slot index shifting (slot renumbering) according to the above-described various embodiments. For example, the UE can thereby know how the frame structure is changed.

[0811] For example, for a cell indicated as not shifted (i.e., shifted by 0 slots), the frame structure defined in a wireless communication system (e.g., an NR system) to which various embodiments are applicable is maintained, and for a cell shifted by N slots, samples corresponding to 16k can exist in a frame at a location other than the beginning of slot 0.

[0812] Method 6

[0813] According to various embodiments, at the beginning of slot 0 of a cell having a larger bandwidth among two cells, the beginning of the slot boundary of the other cell can be aligned.

[0814] For example, whether it is a PCell / PScell or an SCell, by comparing the SCS of the BWP of two cells, if the minimum SCS value (lowest SCS) of the two cells is the same, at the beginning of slot 0 of a cell having a second smallest SCS value (second lowest SCS) (that is, having a longer slot), the beginning of the slot boundary of the other cell can be aligned. For example, when the value of the second smallest SCS is also the same, the size of the third smallest SCS is compared, and when the value of the third smallest SCS is also the same, the size of the fourth smallest SCS is compared, so that the SCS values can be compared until they are different. If all are the same, other frequency points (e.g., center frequency, point A, bandwidth, etc.) can be further compared.

[0815] Method 7

[0816] According to various embodiments, when a relative slot timing offset of N (N is an integer) of an SCell given based on the timing of a PCell / PSCell is given, if N>0 (right shift of the SCell), the beginning of the slot boundary of the SCell can be aligned with the beginning of slot #0 of the PCell / PSCell, and if N<0 (left shift of the SCell), the end of the slot boundary of the SCell can be aligned at the end of slot #0 of the PCell / PSCell.

[0817] The method 7 according to various embodiments can be particularly effective when the SCS of two cells is the same. For example, if the SCS or slot length of two cells is different, considering that the boundary of a cell having a longer slot (compared to the other cell) always coincides with the boundary of the other cell, but the boundary of a cell having a shorter slot (compared to the other cell) is located in the middle of the slot of the other cell, the value of the allowed slot shift can be limited to an integer multiple of the slot length of the cell having a smaller SCS.

[0818] For example, when the SCSs of the two cells are the same, the method according to the above various embodiments can be applied. When the SCSs of the two cells are different (i.e., when the two cells have different slot lengths), the slot boundary (of the beginning) of the cell with the shorter slot can be shifted to align with the beginning of slot #0 of the cell with the longer slot, based on the size relationship between the SCSs of the two cells (i.e., the size relationship between the slot lengths of the two cells).

[0819] For example, when the SCSs of the two cells are different, the slot boundary (of the beginning) of the cell with the shorter slot can be aligned with the beginning of slot #0 of the cell with the longer slot. For example, when the SCSs of the two cells are the same, if N > 0 (or N = 0), the beginning of slot #0 of the PCell / PSCell can be aligned with the beginning of slot #0 (-N mod M) of the SCell. For example, when the SCSs of the two cells are the same, if N < 0, the end of slot #0 of the PCell / PSCell can be aligned with the end of slot #(-N mod M) of the SCell.

[0820] For example, M is the number of slots in one frame when the SCSs of the two cells are the same, and it can be the number of slots in one frame in the cell with the larger SCS value (with the shorter slot length) when the SCSs of the two cells are different.

[0821] For example, the slot boundary alignment method according to Method 7 can be expressed by the equation shown in Table 28.

[0822] [Table 28]

[0823]

[0824] For example, the slot boundary alignment method according to Method 7 can be expressed by the more general equation shown in Table 29.

[0825] [Table 29]

[0826]

[0827] FIG. 24

[0828] According to various embodiments, given a relative slot timing offset N (N is an integer) of an SCell based on the timing of a PCell / PSCell, if N<0 (left shift of the SCell), the beginning of the slot boundary of the SCell can be aligned with the beginning of slot #0 of the PCell / PSCell, and if N>0 (right shift of the SCell), the end of the slot boundary of the SCell can be aligned at the end of slot #0 of the PCell / PSCell.

[0829] The method 7-a) according to various embodiments can be particularly effective when the SCS of two cells is the same. For example, if the SCS or slot length of two cells is different, considering that the boundary of a cell having a longer slot (compared to the other cell) is always consistent with that of the other cell, but the boundary of a cell having a shorter slot (compared to the other cell) is located in the middle of the slot of the other cell, the value of the allowed slot shift can be limited to an integer multiple of the slot length of the cell having a smaller SCS.

[0830] For example, the slot boundary alignment method according to the method 7-a) can be represented by the general formula shown in Table 30.

[0831] [Table 30]

[0832]

[0833] According to the method 7 and / or the method 7-a) based on various embodiments, when two cells have the same SCS, since the number of samples of the right (and / or left) shifted SCell for a given positive (and / or negative) slot offset N is equal to the number of samples of the left (and / or right) shifted SCell with respect to -N, when the network operates with a slot offset N with respect to two cells (e.g., cell 1 and cell 2), UE 1 for which cell 1 is a PCell / PSCell and UE 2 for which cell 2 is a PCell / PSCell can accurately know the shift length maintained by the network without a contradictory number of samples.

[0834] According to the method 7 and / or the method 7-a) based on various embodiments, the left / right shift length can be symmetrical (the same) when the absolute value of a given N is the same.

[0835] That is, the left / right shift length is symmetrical when the absolute value of a given N is the same.

[0836] Since signals are transmitted and received between the network and the UE, it can be very important to accurately configure the timing assumed by the network and the UE. Taking a frame structure of a wireless communication system to which various embodiments are applicable as an example, specifically, when SCS values of two cells are 60kHz / 60kHz and 120kHz / 120kHz, respectively, it can be more effectively applied to the method 7 and / or the method 7-a according to various embodiments. For example, when SCS values of two cells are 60kHz / 60kHz and 120kHz / 120kHz, respectively, the method 7 and / or the method 7-a according to various embodiments can be applied in a limited manner.

[0837] Network initial access and communication procedure

[0838] The UE according to various embodiments can perform a network access procedure in order to perform the procedures and / or methods described / proposed above. For example, the UE can receive and store system information and configuration information required to perform the procedures and / or methods described / proposed above while performing access to a network (e.g., a base station). The configuration information required by various embodiments can be received through higher layer (e.g., RRC layer; medium access control (MAC) layer, etc.) signaling.

[0839] FIG. 24 is a diagram briefly illustrating an initial network access and subsequent communication procedure according to various embodiments. In an NR system to which various embodiments are applicable, a physical channel and a reference signal can be transmitted using beamforming. When signal transmission based on beamforming is supported, a beam management procedure can be involved in order to align beams between a base station and a UE. In addition, signals proposed in various embodiments can be transmitted / received using beamforming. In a radio resource control (RRC) idle mode, beam alignment can be performed based on an SSB (or SS / PBCH block). On the other hand, in an RRC CONNECTED mode, beam alignment can be performed based on a CSI-RS (in DL) and an SRS (in UL). Furthermore, when signal transmission based on beamforming is not supported, operations related to beams can be omitted in the following description.

[0840] As FIG. 25As shown, a base station (e.g., a BS) can periodically transmit an SSB (2702). Here, the SSB includes a PSS / SSS / PBCH. The SSB can be transmitted using beam sweeping. Thereafter, the base station can transmit remaining minimum system information (RMSI) and other system information (OSI) (2704). The RMSI can include information (e.g., PRACH configuration information) required for the UE to initially access the base station. Further, the UE identifies a best SSB after performing SSB detection. Thereafter, the UE can transmit a RACH preamble (message 1, Msg1) to the base station by using a PRACH resource linked / corresponding to an index (i.e., a beam) of the best SSB (2706). The beam direction of the RACH preamble is related to the PRACH resource. The association between the PRACH resource (and / or the RACH preamble) and the SSB (index) can be configured through system information (e.g., RMSI). Thereafter, as part of the RACH procedure, the base station can transmit a random access response (RAR) (Msg2) in response to the RACH preamble (2708), and the UE can transmit a Msg3 (e.g., an RRC connection request) using an UL grant in the RAR (2710), and the base station can transmit a contention resolution message (Msg4) (2712). The Msg4 can include an RRC connection setup.

[0841] When an RRC connection is established between the base station and the UE through the RACH procedure, subsequent beam alignment can be performed based on an SSB / CSI-RS (in the DL) and an SRS (in the UL). For example, the UE can receive the SSB / CSI-RS (2714). The UE can generate a beam / CSI report using the SSB / CSI-RS. Further, the base station can request the beam / CSI report from the terminal through a DCI (2716). In this case, the UE can generate a beam / CSI report based on the SSB / CSI-RS and transmit the generated beam / CSI report to the base station through a PUSCH / PUCCH (2718). The beam / CSI report can include a beam measurement result, information about a preferred beam, etc. The base station and the UE can switch beams based on the beam / CSI report (2720a, 2720b).

[0842] Thereafter, the UE and the base station can perform the processes and / or methods described / proposed above. For example, according to various embodiments, the UE and the base station can process information in a memory and transmit a radio signal or process a received radio signal and store it in a memory based on configuration information obtained during a network access procedure (e.g., a system information acquisition procedure, an RRC connection procedure through a RACH, etc.). Here, the radio signal can include at least one of a PDCCH, a PDSCH, and an RS (reference signal) for a downlink, and can include at least one of a PUCCH, a PUSCH, and an SRS for an uplink.

[0843] Also, the UE and the base station can perform the processes and / or methods described / proposed above as at least a part of the initial access procedure described above.

[0844] DRX (Discontinuous Reception) operation

[0845] RRC_CONNECTED DRX is a diagram illustrating a DRX operation according to various embodiments.

[0846] The UE according to various embodiments can perform a DRX operation while performing the processes and / or methods described / proposed above. A UE configured with DRX can reduce power consumption by discontinuously receiving a DL signal. DRX can be performed in an RRC (Radio Resource Control)_IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state. In the RRC_IDLE state and the RRC_INACTIVE state, DRX is used to discontinuously receive a paging signal.

[0847] FIG. 25

[0848] In the RRC_CONNECTED state, DRX is used for discontinuous reception of a PDCCH. For convenience, the DRX performed in the RRC_CONNECTED state is referred to as RRC_CONNECTED DRX.

[0849] Referring to RRC_IDLE DRXof (a), a DRX cycle consists of an on-duration and an opportunity for DRX. The DRX cycle defines a time interval in which the on-duration is periodically repeated. The on-duration indicates a time period in which the UE monitors for reception of PDCCH. When DRX is configured, the UE performs PDCCH monitoring during the on-duration. If PDCCH is successfully detected during PDCCH monitoring, the UE operates an inactivity timer and remains in a wake-up state. On the other hand, if PDCCH is not successfully detected during PDCCH monitoring, the UE enters a sleep state after the on-duration ends. Thus, when DRX is configured, PDCCH monitoring / reception can be discontinuously performed in time domain when performing the procedures and / or methods described / proposed above. For example, when DRX is configured, PDCCH reception occasions (e.g., slots with PDCCH search space) can be discontinuously configured according to the DRX configuration in various embodiments. On the other hand, when DRX is not configured, PDCCH monitoring / reception can be continuously performed in time domain when performing the procedures and / or methods described / proposed above. For example, when DRX is not configured, PDCCH reception occasions (e.g., slots with PDCCH search space) can be continuously configured in various embodiments. Also, PDCCH monitoring can be limited within a time interval configured as a measurement gap, regardless of whether DRX is configured or not.

[0850] Table 31 shows procedures of a UE related to DRX (RRC_CONNECTED state). Referring to Table 31, DRX configuration information is received through higher layer (e.g., RRC) signaling, and whether DRX is on / off is controlled by a DRX command of a MAC layer. If DRX is configured, the UE can discontinuously perform PDCCH monitoring when performing the procedures and / or methods proposed / described in various embodiments.

[0851] [Table 31]

[0852]

[0853] Here, the MAC-CellGroupConfig includes configuration information necessary for configuring MAC (Medium Access Control) parameters for a cell group. The MAC-CellGroupConfig can further include configuration information related to DRX. For example, the MAC-CellGroupConfig can include the following information to define DRX.

[0854] - Value of drx-OnDurationTimer: defines the length of the start duration of the DRX cycle

[0855] - Value of drx-InactivityTimer: defines the length of the duration for which the UE remains awake after detecting a PDCCH occasion of a PDCCH indicating initial UL or DL data.

[0856] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum duration from reception of a DL initial transmission until reception of a DL retransmission.

[0857] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum duration from reception of a UL initial transmission grant until reception of a UL retransmission grant.

[0858] - drx-LongCycleStartOffset: defines the length of time and starting point of the DRX cycle.

[0859] - drx-ShortCycle (optional): defines the duration of the short DRX cycle.

[0860] Here, if any of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerDL is in operation, the UE performs PDCCH monitoring at each PDCCH occasion while remaining in the awake state.

[0861] FIG. 25

[0862] In RRC_IDLE state and RRC-INACTIVE state, DRX is used for discontinuous reception of paging signals. For convenience, the DRX performed in RRC_IDLE (or RRC_INACTIVE) state is referred to as RRC_IDLE DRX.

[0863] Therefore, when DRX is configured, PDCCH monitoring / reception can be performed discontinuously in time domain when performing the above-described / proposed procedures and / or methods.

[0864] Reference FIG. 26(b), the DRX can be configured for discontinuous reception of the paging signal. The UE can receive the DRX configuration information from the base station through higher layer (e.g., RRC) signaling. The DRX configuration information can include a DRX cycle, a DRX offset, and configuration information for a DRX timer. The UE repeats an on-duration and a sleep duration according to the DRX cycle. The UE can operate in a wake-up mode during the on-duration and can operate in a sleep mode during the sleep duration. In the wake-up mode, the UE can monitor a paging occasion (PO) to receive a paging message. The PO means a time resource / duration (e.g., subframe, slot) in which the UE expects to receive the paging message. The PO monitoring includes monitoring a PDCCH (hereinafter, paging PDCCH) scrambled with a P-RNTI (or MPDCCH, NPDCCH) from the PO. The paging message can be included in the paging PDCCH or a PDSCH scheduled by the paging PDCCH. One or more POs are included in a paging frame (PF), and the PF can be periodically configured based on a UE ID. Here, the PF corresponds to one radio frame, and the UE ID can be determined based on an international mobile subscriber identity (IMSI) of the UE. When the DRX is configured, the UE monitors only one PO per DRX cycle. When the UE receives a paging message indicating its ID and / or a system information change in the PO, the UE can perform a RACH procedure to initialize (or reset) a connection with the base station, or can receive (or acquire) new system information from the base station. Accordingly, in performing the above-described / proposed procedures and / or methods, the PO monitoring can be discontinuously performed in the time domain for the RACH for the connection with the base station or for receiving (or acquiring) the new system information from the base station.

[0865] The above-described initial access procedure and / or DRX operation can be combined with the above-described contents of parts 1 to 2 to constitute other various embodiments, and it can be clearly understood by one of ordinary skill in the art.

[0866] FIG. 27 FIG. 1 is a diagram briefly illustrating an operation method of a UE and a base station according to various embodiments.

[0867] FIG. 28 FIG. 2 is a flowchart illustrating an operation method of a UE according to various embodiments.

[0868] FIG. 26 to FIG. 28 FIG. 3 is a flowchart illustrating an operation method of a base station according to various embodiments.

[0869] Referring to 3. Device configuration example for implementing various embodiments In operation 2601 and 2801 according to various embodiments, the base station can acquire / generate / configure information related to a slot offset. For example, the information related to the slot offset can be information related to carrier aggregation.

[0870] In operation 2603, 2703, and 2803 according to various embodiments, the base station can transmit information related to the slot offset, and the UE can receive the information.

[0871] In operation 2605 and 2705 according to various embodiments, the UE can determine the slot offset. For example, the UE can determine the slot offset between the first cell and the second cell based on the information related to the slot offset.

[0872] In operation 2607, 2707, and 2807 according to various embodiments, communication can be performed between the UE and the base station. For example, the communication can be performed based on the carrier aggregation related to the slot offset. For example, the communication can include one or more of the transmission / reception of the PDSCH and / or the transmission / reception of the PUSCH.

[0873] According to various embodiments, the information related to the slot offset can be information based on a reference SCS. For example, the reference SCS can be used for the slot offset. For example, the reference SCS can be determined based on and / or based on a preconfigured condition. For example, the preconfigured condition can be a preconfigured condition for defining / configuring / obtaining the reference SCS.

[0874] According to various embodiments, based on the DRX configured, the PDCCH for one or more of the PDSCH and / or the PUSCH can be transmitted / received in an on duration related to the DRX. For example, when the base station configures the DRX for the UE, the PDCCH for one or more of the PDSCH and / or the PUSCH can be transmitted in the on duration related to the DRX. For example, when the DRX is configured, the UE can monitor the PDCCH for one or more of the PDSCH and / or the PUSCH in the on duration related to the DRX.

[0875] For example, the slot offset can be a slot offset between the first cell and the second cell that does not align a frame boundary. For example, the frame boundary of the first cell and the frame boundary of the second cell can not align in the time domain. For example, even though the frame boundary of the first cell and the frame boundary of the second cell do not align, the slot boundary of the first cell and the slot boundary of the second cell can align.

[0876] More specific operations of the UE and / or the base station according to the above various embodiments can be described and performed based on the contents of the above-described parts 1 to 2.

[0877] Since the examples of the proposed method described above can also be included as one of various embodiments, it is clear that they can be considered as a proposed method. In addition, the proposed method described above can be implemented independently, or in the form of a combination (or integration) of part of the proposed method. A rule can be defined so that the base station informs the UE of information about whether to apply the proposed method (or information about the rule of the proposed method) through a pre-defined signal (e.g., a physical layer signal or a higher layer signal).

[0878] FIG. 29

[0879] 3.1. Configuration example of an apparatus to which various embodiments are applied

[0880] FIG. 29 is a diagram illustrating an apparatus to which various embodiments can be implemented.

[0881] FIG. 29 The apparatus shown in FIG. 1 can be a user equipment (UE) and / or a base station (e.g., eNB or gNB) adapted to perform the above-described mechanisms, or any apparatus performing the same operations.

[0882] Referring to FIG. 29 , the apparatus can include a digital signal processor (DSP) / microprocessor 210 and a radio frequency (RF) module (transceiver) 235. The DSP / microprocessor 210 is electrically connected to the transceiver 235 to control the transceiver 235. The apparatus includes a power management module 205, a battery 255, a display 215, a keypad 220, a SIM card 225, a memory device 230, an antenna 240, a speaker 245, and an input device 250.

[0883] Specifically, FIG. 29 A UE including a receiver 235 configured to receive a request message from a network and a transmitter 235 configured to transmit timing transmission / reception timing information to the network can be shown. Such a receiver and transmitter can constitute the transceiver 235. The UE can further include a processor 210 connected to the transceiver 235.

[0884] In addition, FIG. 29 A network apparatus including a transmitter 235 configured to transmit a request message to a UE and a receiver 235 configured to receive transmission / reception timing information from the UE can also be shown. The transmitter and receiver can constitute the transceiver 235. The network further includes a processor 210 connected to the transmitter and receiver. The processor 210 can calculate a latency based on the transmission / reception timing information.

[0885] Accordingly, the processor included in the UE (or the communication device included in the UE) and the processor included in the base station (or the processor of the communication device included in the base station) according to various embodiments can control the memory and can operate as follows.

[0886] According to various embodiments, the one or more processors included in the UE can determine a slot offset between the first cell and the second cell based on the information related to the slot offset. For example, the slot offset can be a slot offset between the first cell and the second cell that is misaligned with a frame boundary.

[0887] According to various embodiments, the one or more processors included in the UE can perform communication. For example, the communication can be performed based on carrier aggregation with the slot offset. For example, the communication can include one or more of receiving a PDSCH and / or transmitting a PUSCH.

[0888] According to various embodiments, the information related to the slot offset can be information based on a reference SCS. For example, the reference SCS can be used for the slot offset. For example, the reference SCS can be determined based on and / or based on a pre-configuration condition. For example, the pre-configuration condition can be a pre-configuration condition for defining / configuring / obtaining the reference SCS.

[0889] According to various embodiments, based on the DRX configuration, a PDCCH for one or more of a PDSCH and / or a PUSCH can be monitored in an ON period related to the DRX.

[0890] For example, the slot offset can be a slot offset between the first cell and the second cell that is misaligned with a frame boundary. For example, a frame boundary of the first cell and a frame boundary of the second cell can be misaligned in a time domain. For example, even though the frame boundary of the first cell and the frame boundary of the second cell are misaligned in the time domain, a slot boundary of the first cell and a slot boundary of the second cell can be aligned.

[0891] According to various embodiments, the one or more processors included in the base station (or, the one or more processors of the communication device included in the base station) can obtain / generate / set information related to a slot offset between the first cell and the second cell. For example, the information related to the slot offset can be used for carrier aggregation.

[0892] According to various embodiments, the one or more processors included in the base station can transmit the information related to the slot offset.

[0893] According to various embodiments, one or more processors included in a base station can perform communication. For example, the communication can be performed based on a carrier aggregation related to a slot offset. For example, the communication can include one or more of a transmission of a PDSCH and / or a reception of a PUSCH.

[0894] According to various embodiments, the information related to the slot offset can be information based on a reference SCS. For example, the reference SCS can be used for the slot offset. For example, the reference SCS can be determined based on satisfying a pre-configuration condition and / or based on a pre-configuration condition. For example, the pre-configuration condition can be a pre-configuration condition for defining / configuring / obtaining the reference SCS.

[0895] According to various embodiments, based on the DRX being configured, a PDCCH for one or more of a PDSCH and / or a PUSCH can be transmitted in an ON period related to the DRX.

[0896] For example, the slot offset can be a slot offset between a first cell and a second cell that are misaligned in a frame boundary. For example, a frame boundary of the first cell and a frame boundary of the second cell can be misaligned in a time domain. For example, even though the frame boundary of the first cell and the frame boundary of the second cell are misaligned, a slot boundary of the first cell and a slot boundary of the second cell can be aligned.

[0897] More specific operations of the processors included in the base station and / or the UE according to the above-described various embodiments can be described and performed based on the above-described first to second parts.

[0898] In addition, various embodiments can be combined with / combined each other as long as they are not mutually incompatible. For example, a base station and / or a UE (or processors in the base station and / or the UE) according to various embodiments can perform combined / combined operations thereof, unless the embodiments are incompatible.

[0899] 3.2. Example of a communication system to which various embodiments are applied

[0900] Having described various embodiments, focus is on a data transmission / reception relationship between a base station and a UE in a wireless communication system. However, various embodiments are not limited thereto. For example, various embodiments can also relate to the following technical configurations.

[0901] Although not limited thereto, descriptions, functions, procedures, suggestions, methods, and / or operation flowcharts according to various embodiments can be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0902] Hereinafter, examples will be illustrated in more detail with reference to the accompanying drawings. In the following drawings / description, the same reference numerals can represent the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise specified.

[0903] FIG. 29 A communication system applied to various embodiments is exemplified.

[0904] Referring to 3.2.1 Example of wireless device applying various embodiments , a communication system 1 applied to various embodiments includes wireless devices, base stations, and networks. Here, a wireless device means a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and can be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless devices include a robot 100a, vehicles 100b-1, 100b-2, an extended reality (XR) device 100c, a handheld device 100d, and a home appliance 100e, an Internet of Things (IoT) device 100f, and an AI device / server 400. For example, the vehicles can include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of inter-vehicle communication, etc. Here, the vehicles can include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device includes an AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) device, and can be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) provided in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. The portable device can include a smartphone, a smartpad, a wearable device (e.g., a smartwatch, smartglasses), a computer (e.g., a laptop), etc. The home appliance can include a television, a refrigerator, a washing machine, etc. The IoT device can include a sensor, a smartmeter, etc. For example, the base stations and the networks can be implemented as wireless devices, and a specific wireless device 200a can operate as a base station / network node with respect to other wireless devices.

[0905] The wireless devices 100a to 100f can be connected to the network 300 through the base station 200. Artificial intelligence (AI) technology can be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f can be connected to the AI server 400 through the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other through the base station 200 / network 300, but can also directly communicate (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). In addition, IoT devices (e.g., sensors) can directly communicate with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0906] The wireless communication / connection 150a, 150b, 150c can be performed between the wireless devices 100a to 100f and the base station 200 and between the base stations 200. Here, the wireless communication / connection can be performed through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and inter-base station communication 150c (e.g., relay, IAB (integrated access backhaul)). Through the wireless communication / connection 150a, 150b, and 150c, the wireless devices and the base stations / wireless devices and the base stations can transmit / receive radio signals to / from each other. For example, the wireless communication / connection 150a, 150b, and 150c can transmit / receive signals through various physical channels. To this end, based on various proposals of various embodiments, at least a part of various configuration information configuration procedures, various signal processing procedures (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation procedures, etc. can be performed.

[0907] FIG. 31

[0908] ​ A wireless device to which various embodiments are applied is exemplified.

[0909] Referring to FIG. 31 , the first wireless device 100 and the second wireless device 200 can transmit / receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, the {first wireless device 100, second wireless device 200} can correspond to the {wireless device 100x, base station 200} and / or the {wireless device 100x, wireless device 100x} of the above-described various embodiments. FIG. 30

[0910] ​The first wireless device 100 includes one or more processors 102 and one or more memories 104, and can further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or the transceiver 106 and can be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 102 can process information in the memory 104 to generate first information / signal, and then transmit a wireless signal including the first information / signal through the transceiver 106. Also, the processor 102 can receive a radio signal including second information / signal through the transceiver 106, and then store information obtained by processing the signal from the second information / signal in the memory 104. The memory 104 can be connected to the processor 102 and can store various information related to the operation of the processor 102. For example, the memory 104 can store software code including instructions for implementing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the document. Here, the processor 102 and the memory 104 can be a part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 can be coupled to the processor 102 and can transmit and / or receive a wireless signal via the one or more antennas 108. The transceiver 106 can include a transmitter and / or a receiver. The transceiver 106 can be used interchangeably with a radio frequency (RF) unit. In various embodiments, the wireless device can refer to a communication modem / circuit / chip.

[0911] The second wireless device 200 includes one or more processors 202, one or more memories 204, and can further include one or more transceivers 206 and / or one or more antennas 208. The processor(s) 202 control the memory(ies) 204 and / or the transceiver(s) 206 and can be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor(s) 202 can process information in the memory(ies) 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal through the transceiver(s) 206. Also, the processor(s) 202 can receive a wireless electric signal including fourth information / signal through the transceiver(s) 206, and then store information obtained by processing the signal from the fourth information / signal in the memory(ies) 204. The memory(ies) 204 can be connected to the processor(s) 202 and can store various information related to the operation of the processor(s) 202. For example, the memory(ies) 204 can store software code including instructions for performing some or all of the processes controlled by the processor(s) 202 or for implementing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the document. Here, the processor(s) 202 and the memory(ies) 204 can be a part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver(s) 206 can be coupled to the processor(s) 202 and can transmit and / or receive a wireless signal via the one or more antennas 208. The transceiver(s) 206 can include a transmitter and / or a receiver. The transceiver(s) 206 can be used interchangeably with RF unit(s). In various embodiments, a wireless device can refer to a communication modem / circuit / chip.

[0912] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers can be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 can implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 can generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein. One or more processors 102, 202 can generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed herein. One or more processors 102 and 202 generate and provide signals (e.g., baseband signals) including the PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed herein to one or more transceivers 106 and 206. One or more processors 102, 202 can receive signals (e.g., baseband signals) from one or more transceivers 106, 206 and can obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein.

[0913] One or more processors 102, 202 can be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102, 202 can be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) can be included in one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present document can be implemented using firmware or software, and the firmware or software can be implemented as including modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed herein can be included in one or more processors 102, 202, or can be stored in one or more memories 104, 204 and driven by one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of codes, instructions, and / or instruction sets.

[0914] One or more memories 104, 204 can be coupled to the one or more processors 102, 202 and can store various forms of data, signals, messages, information, programs, codes, instructions, and / or instructions. The one or more memories 104, 204 can include ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 can be internal and / or external to the one or more processors 102, 202. Also, the one or more memories 104, 204 can be coupled to the one or more processors 102, 202 by various technologies such as wired connections or wireless connections.

[0915] The one or more transceivers 106, 206 can transmit user data, control information, radio signals / channels, etc. mentioned in the methods and / or operational flowcharts herein to one or more other apparatuses. The one or more transceivers 106, 206 can receive user data, control information, radio signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed herein from one or more other apparatuses. For example, the one or more transceivers 106, 206 can be coupled to the one or more processors 102, 202 and can transmit and receive wireless signals. For example, the one or more processors 102, 202 can control the one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other apparatuses. Also, the one or more processors 102, 202 can control the one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other apparatuses. Furthermore, the one or more transceivers 106, 206 can be coupled to the one or more antennas 108, 208 and can be configured to transmit and receive user data, control information, radio signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts through the one or more antennas 108, 208. In the present document, the one or more antennas can be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using the one or more processors 102, 202. The one or more transceivers 106, 206 can convert user data, control information, radio signals / channels, etc. processed using the one or more processors 102, 202 from baseband signals to RF band signals. To this end, the one or more transceivers 106, 206 can include (analog) oscillators and / or filters.

[0916] According to various embodiments, one or more memories (e.g., 104 or 204) can store instructions or a program, and the instructions or the program, when executed, can cause one or more processors operatively coupled with the one or more memories to perform operations according to various embodiments or implementation.

[0917] According to various embodiments, a computer-readable (storage) medium can store one or more instructions or a computer program, and the one or more instructions or the computer program, when executed by one or more processors, can cause the one or more processors to perform operations according to various embodiments or implementation.

[0918] According to various embodiments, a processing device or apparatus can include one or more processors and one or more computer memories connectable to the one or more processors. The one or more computer memories can store instructions or a program, and the instructions or the program, when executed, can cause one or more processors operatively coupled with the one or more memories to perform operations according to various embodiments or implementation.

[0919] 3.2.2. Use Examples of Wireless Devices to Which Various Embodiments are Applied

[0920] FIG. 32 Another example of a wireless device to which various embodiments can be applied is illustrated. The wireless device can be implemented in various forms according to the use examples / services (refer to FIG. 30 ).

[0921] Referring to FIG. 32 , the wireless devices 100 and 200 can correspond to the wireless devices 100 and 200 of FIG. 31 , and can be composed of various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 can include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit can include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 can include one or more processors 102, 202 and / or one or more memories 104, 204 of FIG. 31 . For example, the transceiver 114 can include a communication circuit 112 and a communication antenna 116 of FIG. 31The one or more transceivers 106, 206 and / or the one or more antennas 108, 208. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 140, and controls the general operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on programs / codes / commands / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., another communication device) through the communication unit 110 through a wireless / wired interface, or can store information received from the outside (e.g., another communication device) through the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0922] The additional elements 140 can be variously configured according to the type of the wireless device. For example, the additional elements 140 can include at least one of a power supply unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device can be implemented in the form of a robot (100a), a vehicle (100b-1, 100b-2), an XR device (100c), a portable device (100d), a home appliance (100e), an IoT device (100f), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medical device, a financial technology device (or a financial device), a security device, a climate / environment device, an AI server / device (400), a base station (200), and a network node. According to a use example / service, the wireless device can be mobile or used in a fixed location. FIG. 30 FIG. 30 FIG. 30 FIG. 30 FIG. 30 FIG. 30 FIG. 30 FIG. 32

[0923] In FIG. 32 ​​​​​​​​In the embodiments, various elements, components, units, and / or modules in the wireless devices 100 and 200 can all be interconnected by a wired interface, or at least some of them can be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected through a wire, and the control unit 120 and the first unit (e.g., 130, 140) can be wirelessly connected to the communication unit 110 through the communication unit 110. In addition, each element, component, unit, and / or module within the wireless devices 100, 200 can further include one or more elements. For example, the control unit 120 can be configured with one or more processor groups. For example, the control unit 120 can be configured as a group of communication control processors, application processors, electronic control units (ECUs), graphic processing processors, memory control processors, etc. As another example, the memory unit 130 can include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory, and / or a combination thereof.

[0924] Hereinafter, embodiments will be described in greater detail 3.2.3. Examples of Portable Devices to Which Various Embodiments are Applied with reference to the accompanying drawings.

[0925] FIG. 33

[0926] FIG. 33 A portable device to which various embodiments are applicable is exemplified. The portable device can include a smartphone, a smartpad, a wearable device (e.g., a smartwatch, smartglasses), and a portable computer (e.g., a laptop computer). The portable device can be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0927] Referring to FIG. 32 , the portable device 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. The antenna unit 108 can be configured as a part of the communication unit 110. The blocks 110 to 130 / 140a to 140c correspond to the blocks 110 to 130 / 140 of 3.2.4. Examples of Vehicles or Self-Driving Vehicles to Which Various Embodiments are Applied , respectively.

[0928] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations. The control unit 120 can control the components of the portable device 100 to perform various operations. The control unit 120 can include an application processor (AP). The memory unit 130 can store data / parameters / programs / codes / commands required to drive the portable device 100. Also, the memory unit 130 can store input / output data / information. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support a connection between the portable device 100 and another external device. The interface unit 140b can include various ports (e.g., audio input / output ports and video input / output ports) for connection with external devices. The input / output unit 140c can receive or output image information / signals, audio information / signals, data, and / or information input from a user. The input / output unit 140c can include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0929] For example, in the case of data communication, the input / output unit 140c can obtain information / signals (e.g., touch, text, voice, image, video) input from a user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into wireless signals and directly transmit the converted wireless signals to another wireless device or a base station. Also, after receiving radio signals from another wireless device or a base station, the communication unit 110 can restore the received radio signals to original information / signals. After storing the restored information / signals in the memory unit 130, it can be output in various forms (e.g., text, voice, image, video, haptic) through the input / output unit 140c.

[0930] FIG. 34

[0931] FIG. 34 A vehicle or an autonomous driving vehicle to which various embodiments are applied is exemplified. The vehicle or the autonomous driving vehicle can be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, etc.

[0932] Referring to FIG. 32 The vehicle or the autonomous vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, and a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be configured as a part of the communication unit 110. The blocks 110 / 130 / 140a-140d are respectively the same as those of the portable device 100 described above. FIG. 34corresponds to the block 110 / 130 / 140.

[0933] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) with other vehicles, base stations (e.g., base stations, roadside base stations, etc.), servers, etc. The control unit 120 can control elements of the vehicle or the autonomous driving vehicle 100 to perform various operations. The control unit 120 can include an electronic control unit (ECU). The driving unit 140a can cause the vehicle or the autonomous driving vehicle 100 to travel on the ground. The driving unit 140a can include an engine, a motor, a power train, a wheel, a brake, a steering device, etc. The power supply unit 140b supplies power to the vehicle or the autonomous driving vehicle 100, and can include a wired charging circuit / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle states, surrounding environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward movement / rearward movement sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination level sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement a technology for maintaining a travel lane, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomous driving along a predetermined route, and a technology for automatically setting a route when a destination is set.

[0934] As an example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and a driving method based on the obtained data. The control unit 120 can control the driving unit 140a to move the vehicle or the autonomous driving vehicle 100 along the autonomous driving path according to the driving method (e.g., speed / direction adjustment). During autonomous driving, the communication unit 110 can obtain the latest traffic information data from an external server aperiodically / periodically, and can acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c can obtain vehicle states and surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and the driving method based on the newly obtained data / information. The communication unit 110 can transmit information about a vehicle position, an autonomous driving route, a driving method, etc. to an external server. The external server can predict traffic information data in advance using an AI technology, etc. based on information collected from vehicles or autonomous driving vehicles, and can provide the predicted traffic information data to the vehicles or the autonomous driving vehicles.

[0935] In summary, various embodiments can be implemented by a specific apparatus and / or a UE.

[0936] For example, the specific device can be a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, an unmanned aerial vehicle (UAV), an AI (Artificial Intelligence) module, a robot, an AR (Augmented Reality) device, a VR (Virtual Reality) device, or other devices.

[0937] For example, the UE can be a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a global system for mobile communication (GSM) phone, a WCDMA (Wideband CDMA) phone, a mobile broadband system (MBS) phone, a smart phone, or a multi-mode multi-band (MM-MB) terminal.

[0938] Here, the smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and can refer to a terminal in which a data communication function as a function of a personal portable terminal such as schedule management, facsimile transmission and reception, and Internet access is integrated into a mobile communication terminal. In addition, the multi-mode multi-band terminal refers to a terminal that can operate in both a portable Internet system and other mobile communication systems (e.g., a CDMA (Code Division Multiple Access) 2000 system, a WCDMA (Wideband CDMA) system, etc.) by embedding a multi-modem chip.

[0939] In addition, the UE can be a notebook PC, a handheld PC, a tablet PC, an ultrabook, a tablet PC, a digital broadcast terminal, a PMP (Portable Multimedia Player), a navigation, a wearable device (e.g., a watch-type terminal (smart watch), a glasses-type terminal (smart glasses), or a head-mounted display (HMD)). For example, the drone can be a flying vehicle without a person, and fly by a wireless control signal. For example, the HMD can be a display device worn on the head. For example, the HMD can be used to implement VR or AR.

[0940] Wireless communication techniques to implement various embodiments can include LTE, NR, and 6G, and Narrow Band Internet of Things (NB-IoT) for low power communication. At this time, for example, the NB-IoT technique can be an example of an LPWAN (Low Power Wide Area Network) technique, and can be implemented according to standards such as LTE Cat (Category) NB1 and / or LTE Cat NB2, but is not limited to the above names. Additionally or alternatively, the wireless communication techniques implemented in the wireless device according to various embodiments can perform communication based on an LTE-M technique. In this case, as an example, the LTE-M technique can be an example of an LPWAN technique, and can be referred to as various names such as enhanced machine type communication (eMTC), etc. For example, the LTE-M technique is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-band limited), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) can be implemented according to at least one of various standards such as LTE M, and is not limited to the above names. Additionally or alternatively, in consideration of low power communication, the wireless communication techniques implemented in the wireless device according to various embodiments can include at least one of ZigBee, Bluetooth, and low power wide area network (LPWAN), but are not limited to the above names. For example, the ZigBee technique can generate a PAN (Personal Area Network) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and can be referred to by various names.

[0941] Various embodiments can be implemented through various means. For example, various embodiments can be implemented in hardware, firmware, software, or a combination thereof.

[0942] In the case of implementation through hardware, the method according to various embodiments can be implemented by one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, micro-controllers, microprocessors, etc.

[0943] In the case of implementation through firmware or software, the method according to various embodiments can be implemented in the form of modules, procedures, or functions for performing the above-described functions or operations. For example, software code can be stored in a memory and driven by a processor. The memory can be located inside or outside the processor, and can exchange data with the processor through various known means.

[0944] The various embodiments can be implemented in any of numerous ways. Example implementations of various aspects of the disclosure are described in more detail below. It should be noted that the implementations described below are illustrative only since numerous modifications and adaptations thereof will be apparent to those of ordinary skill in the art. Specifically, the various implementations described herein can be implemented in hardware, software, or a combination thereof. Various aspects of the disclosure can be implemented in one or more computer programs or code that include algorithmic instructions for implementing various methods or functions. The program code can be stored in one or more machine-readable medium(s) associated with one or more computing devices. The various implementations described herein can be implemented as a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. Further, the structures and / or functionality presented herein are sufficiently flexible to be utilized within a variety of different programmable elements and / or computer systems utilizing a variety of operating systems or architectures. For example, the various aspects presented herein can be implemented in a distributed computing system or a cloud computing system. The various implementations presented herein can be implemented as one or more computer programs or code that include algorithmic instructions for implementing various methods or functions. The program code can be stored in one or more machine-readable medium(s) associated with one or more computing devices. The various implementations presented herein can be implemented as a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. Further, the structures and / or functionality presented herein are sufficiently flexible to be utilized within a variety of different programmable elements and / or computer systems utilizing a variety of operating systems or architectures. For example, the various aspects presented herein can be implemented in a distributed computing system or a cloud computing system.

[0945] Industrial Applicability

[0946] The various embodiments can be applied to various wireless access systems. As an example of the various wireless access systems, there are 3rd Generation Partnership Project (3GPP) or 3GPP2 systems. The various embodiments can be applied to not only the various wireless access systems but also all technical fields to which the various wireless access systems are applied. In addition, the proposed method can be applied to a millimeter wave communication system using a very high frequency band.

Claims

1.A base station, the base station comprising: a memory; and at least one processor connected to the memory; wherein the at least one processor is configured to: transmit, to a user equipment (UE), radio resource control (RRC) signaling including information related to a slot offset between a first cell and a second cell in a misaligned frame boundary; and communicate with the UE in the first cell and the second cell related to the misaligned frame boundary, wherein a granularity of the slot offset between the first cell and the second cell is based on a reference subcarrier spacing (SCS) for the slot offset, wherein a start of a slot 0 for the first cell coincides with a start of a slot N for the second cell, and the N is an integer based on the slot offset and the reference SCS, and wherein the reference SCS is a maximum value among a minimum SCS among at least one SCS configured for the first cell and a minimum SCS among at least one SCS configured for the second cell. 2.The base station of claim 1, wherein the RRC signaling includes information for configuring the second cell. 3.The base station of claim 1, wherein the information related to the slot offset includes information on an integer value related to the slot offset, and the integer value related to the slot offset is selected from a pre-configured set of {−A, …, A}, and the A is an integer related to the reference SCS. 4.The base station of claim 3, wherein the A increases based on an increase of the reference SCS, and the A decreases based on a decrease of the reference SCS. 5.The base station of claim 1, wherein based on (i) a determination that the second cell is shifted in a time domain relative to the first cell in a first direction, and (ii) at least one of a SCS used in the first cell and a SCS used in the second cell exceeds 30 kHz: based on the slot offset, a slot 0 of the second cell is identified as shifted based on being shifted in the time domain in the first direction by M*L after being shifted in the time domain in the first direction by a time length corresponding to 16kappa+L compared to before the slot offset is applied, and based on (i) a determination that the second cell is shifted in a time domain relative to the first cell in a second direction, and (ii) at least one of the SCS used in the first cell and the SCS used in the second cell exceeds 30 kHz: based on the slot offset, the slot 0 of the second cell is identified as shifted based on being shifted in the time domain in the second direction by a time length corresponding to 16kappa+L after being shifted in the time domain in the second direction by M*L compared to before the slot offset is applied, and The kappa is 64, the M is an integer greater than or equal to 0 determined based on the slot offset, and the L relates to a slot length of each of at least one slot other than the slot 0 within a 0.5 ms duration of the first cell or the second cell. 6.The base station of claim 1, wherein, the first cell is a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell is a secondary cell (SCell). 7.The base station of claim 1, wherein, a physical downlink shared channel (PDSCH) is transmitted by the base station to the UE based on communicating with the base station in the first cell and the second cell, and wherein a physical downlink control channel (PDCCH) for the PDSCH is transmitted by the base station to the UE within an on duration associated with a discontinuous reception (DRX) based on the DRX being configured. 8.A method performed by a user equipment (UE), the method comprising: receiving, from a base station, radio resource control (RRC) signaling including information related to a slot offset between a first cell and a second cell in a misaligned frame boundary; determining the slot offset between the first cell and the second cell based on the information related to the slot offset; and communicating with the base station in the first cell and the second cell related to the misaligned frame boundary, wherein a granularity of the slot offset is based on a reference sub-carrier spacing (SCS) for the slot offset, wherein a start of a slot 0 for the first cell coincides with a start of a slot N for the second cell, and the N is an integer based on the slot offset and the reference SCS, and wherein the reference SCS is a maximum of a minimum of at least one SCS configured for the first cell and a minimum of at least one SCS configured for the second cell. 9.A user equipment (UE), the UE comprising: a memory; and at least one processor connected to the memory; wherein the at least one processor is configured to: receive, from a base station, radio resource control (RRC) signaling including information related to a slot offset between a first cell and a second cell in a misaligned frame boundary; determine the slot offset between the first cell and the second cell based on the information related to the slot offset; and communicate with the base station in the first cell and the second cell related to the misaligned frame boundary, wherein a granularity of the slot offset is based on a reference sub-carrier spacing (SCS) for the slot offset, wherein a start of a slot 0 for the first cell coincides with a start of a slot N for the second cell, and the N is an integer based on the slot offset and the reference SCS, Among them, the reference SCS is the maximum value of the minimum SCS among at least one SCS configured for the first cell and the minimum SCS among at least one SCS configured for the second cell. Among them, the reference SCS is the maximum value of the minimum SCS among at least one SCS configured for the first cell and the minimum SCS among at least one SCS configured for the second cell.

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