PDCCH Transmission / Reception Method and Apparatus in a Wireless Communication System

Abstract

A method and an apparatus for transmitting and receiving a physical downlink control channel (PDCCH) in a wireless communication system are disclosed. A method for receiving a physical downlink control channel (PDCCH) according to an embodiment of the present disclosure may include receiving an SS / PBCH block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) from a base station, and receiving the PDCCH from the base station at a PDCCH monitoring occasion determined based on a master information block (MIB) in the SS / PBCH block.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and an apparatus for transmitting and receiving a physical downlink control channel (PDCCH) in a wireless communication system.

Background Art

[0002] Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, mobile communication systems have expanded their scope to include data services as well as voice, and currently, due to the explosive increase in traffic, there is a shortage of resources, and users are also demanding faster services. Therefore, a more advanced mobile communication system is desired.

[0003] Requirements for next-generation mobile communication systems are largely the acceptance of explosive data traffic, an epoch-making increase in the transmission rate per user, the acceptance of a significantly increased number of connected devices, very low end-to-end latency, and support for high energy efficiency. To this end, various technologies such as dual connectivity, massive multiple input multiple output (Massive MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking are being studied.

Summary of the Invention

Problems to be Solved by the Invention

[0004] A technical problem of the present disclosure is to provide a method and an apparatus for transmitting and receiving a PDCCH.

[0005] Another technical problem of the present disclosure is to provide a method and apparatus for transmitting and receiving a physical downlink control channel (PDCCH) when the subcarrier spacing of a synchronization signal / physical broadcast channel (SS / PBCH) block and the PDCCH is set to be large.

[0006] Another technical problem of the present disclosure is to provide a method and apparatus for setting the time resources of a control resource set (CORESET) index 0 and a basic (default) physical downlink shared channel (PDSCH) in an SS / PBCH block.

[0007] The technical problem to be achieved in the present disclosure is not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure pertains from the following description.

Means for Solving the Problems

[0008] A method for receiving a PDCCH (physical downlink control channel) in a wireless communication system according to an aspect of the present disclosure, the method performed by a terminal, the method comprising: receiving, from a base station, an SS / PBCH (synchronization signal / physical broadcast channel) block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); and receiving the PDCCH at a PDCCH monitoring occasion determined based on a master information block (MIB) within the SS / PBCH block from the base station. The value of a first parameter used to determine the PDCCH monitoring occasion may be set from among candidate values of the first parameter based on i) information for determining the PDCCH monitoring occasion within the MIB and ii) {subcarrier spacing (SCS) of the SS / PBCH block, SCS of the PDCCH}, and some of the candidate values of the candidate values of the first parameter may be defined to be different from each other depending on whether {SCS of the SS / PBCH block, SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz.

[0009] A method for transmitting a PDCCH (physical downlink control channel) in a wireless communication system according to another aspect of the present disclosure, the method performed by a base station, the method comprising: transmitting, to a terminal, an SS / PBCH (synchronization signal / physical broadcast channel) block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); and transmitting, to the terminal, the PDCCH at a PDCCH monitoring occasion determined based on a master information block (MIB) within the SS / PBCH block. The value of a first parameter used to determine the PDCCH monitoring occasion may be set from among candidate values of the first parameter based on (i) information for determining the PDCCH monitoring occasion within the MIB and (ii) {a subcarrier spacing (SCS) of the SS / PBCH block, an SCS of the PDCCH}, and some of the candidate values of the candidate values of the first parameter may be defined to be different from each other depending on whether {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480,480} kHz or {960,960} kHz.

Advantages of the Invention

[0010] According to an embodiment of the present disclosure, efficient initial connection-related channel transmission and reception in an unlicensed band can be supported.

[0011] According to an embodiment of the present disclosure, by reducing the relative distance between the SS / PBCH block and the PDCCH monitoring opportunity as the sub-carrier spacing of the PDCCH is set larger, efficient initial connection-related channel transmission and reception can be supported.

[0012] The effects obtained from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure pertains from the following description.

Brief Description of Drawings

[0013] The accompanying drawings, which are included as part of the detailed description to assist in understanding the present disclosure, provide embodiments related to the present disclosure and illustrate the technical features of the present disclosure together with the detailed description.

[0014]

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Embodiments for Carrying Out the Invention

[0015] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed below together with the accompanying drawings is for explaining exemplary embodiments of the present disclosure and is not for showing the only embodiments in which the present disclosure can be implemented. The following detailed description includes specific details for providing a complete understanding of the present disclosure. However, it is understood by those skilled in the art that the present disclosure can be implemented without such specific details.

[0016] In some cases, to avoid ambiguity in the concept of the present disclosure, well-known structures and devices may be omitted, or they may be shown in the form of a block diagram centered on the core functions of each structure and device.

[0017] In the present disclosure, when a certain component is "connected", "coupled" or "connected" to another component, this can include not only a direct connection relationship but also an indirect connection relationship in which there are still other components between them. Also, in the present disclosure, the term "comprising" or "having" identifies the presence of the recited features, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or groups thereof.

[0018] In the present disclosure, terms such as "first", "second", etc. are only used for the purpose of distinguishing one component from another and are not used to limit the components. Unless otherwise specifically mentioned, they do not limit the order or importance, etc. between the components. Therefore, within the scope of the present disclosure, the first component in one embodiment can also be referred to as the second component in another embodiment, and similarly, the second component in one embodiment can be referred to as the first component in another embodiment.

[0019] The terms used in the present disclosure are for the purpose of describing specific embodiments and are not for the purpose of limiting the scope of the claims. As used in the description of the embodiments and the appended claims, the singular form is also intended to include the plural form unless specifically stated otherwise in the context. The term "and / or" used in the present disclosure may refer to one of the related listed items or mean to include any and all possible combinations of two or more of them. Also, in the present disclosure, " / " between words has the same meaning as "and / or" unless otherwise stated.

[0020] The present disclosure is described with respect to a wireless communication network or a wireless communication system. The operations performed in the wireless communication network may be performed in the process where a device (e.g., a base station) that governs the wireless communication network controls the network and transmits or receives signals, or may be performed in the process where a terminal coupled to the wireless network transmits or receives signals to / from the network or between terminals.

[0021] In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal on the channel. For example, transmitting a control channel means transmitting control information or a signal on the control channel. Similarly, transmitting a data channel means transmitting data information or a signal on the data channel.

[0022] In the following, the downlink (DL) means communication from the base station to the terminal, and the uplink (UL) means communication from the terminal to the base station. In the downlink, the transmitter may be part of the base station and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station. The base station may be represented as the first communication device, and the terminal may be represented as the second communication device. The base station (BS: Base Station) may be replaced by terms such as fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), access point (AP: Access Point), network (5G network), AI (Artificial Intelligence) system / module, RSU (road side unit), robot, drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc. Also, the terminal (Terminal) may be fixed or mobile, and may be replaced by terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), robot, AI (Artificial Intelligence) module, drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0023] The following techniques may be used in various wireless connection systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA may be implemented by wireless technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA may be implemented by wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA may be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (registered trademark) (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A pro is an 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.

[0024] For the sake of clarity, the description is based on the 3GPP communication system (e.g., LTE-A, NR), but the technical idea of the present disclosure is not limited thereto. LTE means the technology after 3GPP TS (Technical Specification) 36.xxx Release 8. Specifically, the LTE technology after 3GPP TS 36.xxx Release 10 is called LTE-A, and the LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro. 3GPP NR means the technology after TS 38.xxx Release 15. LTE / NR may be called the 3GPP system. "xxx" means the detailed number of the standard document. LTE / NR may be called the 3GPP system. Regarding the background technology, terms, abbreviations, etc. used in the description of the present disclosure, reference can be made to the matters described in the standard documents published before the present disclosure. For example, the following documents can be referred to.

[0025] In 3GPP LTE, reference can be made to TS 36.211 (Physical Channels and Modulation), TS 36.212 (Multiplexing and Channel Coding), TS 36.213 (Physical Layer Procedures), TS 36.300 (General Description), TS 36.331 (Radio Resource Control).

[0026] In 3GPP NR, reference can be made to TS 38.211 (Physical Channels and Modulation), TS 38.212 (Multiplexing and Channel Coding), TS 38.213 (Physical Layer Procedures for Control), TS 38.214 (Physical Layer Procedures for Data), TS 38.300 (General Description of NR and NG-RAN (New Generation-Radio Access Network)), TS 38.331 (Radio Resource Control Protocol Specification).

[0027] The abbreviations of the terms that can be used in the present disclosure are defined as follows.

[0028] - BM: Beam management

[0029] - CQI: Channel Quality Indicator

[0030] - CRI: Channel State Information - Reference Signal Resource Indicator

[0031] - CSI: Channel State Information

[0032] - CSI-IM: Channel State Information - Interference Measurement

[0033] - CSI-RS: Channel State Information - Reference Signal

[0034] - DMRS: Demodulation Reference Signal

[0035] - FDM: Frequency Division Multiplexing

[0036] - FFT: Fast Fourier Transform

[0037] - IFDMA: Interleaved Frequency Division Multiple Access

[0038] - IFFT: Inverse Fast Fourier Transform

[0039] - L1-RSRP: Layer 1 reference signal received power

[0040] - L1-RSRQ: Layer 1 reference signal received quality

[0041] - MAC: medium access control

[0042] - NZP: non-zero power

[0043] - OFDM: orthogonal frequency division multiplexing

[0044] - PDCCH: physical downlink control channel

[0045] - PDSCH: physical downlink shared channel

[0046] - PMI: precoding matrix indicator

[0047] - RE: resource element

[0048] - RI: Rank indicator

[0049] - RRC: radio resource control

[0050] - RSSI: received signal strength indicator

[0051] - Rx: Reception

[0052] - QCL: Quasi co-location

[0053] - SINR: Signal to interference and noise ratio (signal to interference plus noise ratio)

[0054] - SSB (or SS / PBCH block): Synchronization signal block (including primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH))

[0055] - TDM: Time division multiplexing

[0056] - TRP: Transmission and reception point

[0057] - TRS: Tracking reference signal

[0058] - Tx: Transmission

[0059] - UE: User equipment

[0060] - ZP: Zero power

[0061] System Overview

[0062] As more communication devices demand larger communication capacities, the need for improved mobile broadband communication compared to existing radio access technologies (RATs) is on the rise. In addition, massive Machine Type Communications (MTC), which connects a large number of devices and things to provide various services anytime and anywhere, is also one of the major issues considered in next-generation communication. In addition to this, the design of communication systems considering services / terminals sensitive to reliability and latency is also being discussed. Thus, the introduction of next-generation RATs considering enhanced mobile broadband communication (eMBB), massive MTC (mMTC), Ultra-Reliable and Low Latency Communication (URLLC), etc. is being discussed, and in this disclosure, for convenience, this technology is referred to as NR. NR is an expression representing an example of 5G RAT.

[0063] The new RAT system including NR uses an OFDM transmission method or a transmission method similar thereto. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may directly follow the numerology of existing LTE / LTE-A, but can support a larger system bandwidth (e.g., 100 MHz). Alternatively, one cell can also support multiple numerologies. That is, terminals operating with different numerologies may coexist within one cell.

[0064] Numerology corresponds to one subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.

[0065] FIG. 1 illustrates the structure of a wireless communication system to which the present disclosure is applicable.

[0066] Referring to FIG. 1, the NG-RAN is composed of gNBs that provide NG-RA (NG-Radio Access) user plane (user plane, i.e., new AS (access stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and control plane (control plane, RRC) protocol terminations for UEs. The gNBs are interconnected via the Xn interface. The gNBs are also connected to the NGC (New Generation Core) via the NG interface. More specifically, the gNBs are connected to the AMF (Access and Mobility Management Function) via the N2 interface and to the UPF (User Plane Function) via the N3 interface.

[0067] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure is applicable.

[0068] The NR system can support multiple numerologies. Here, the numerology may be defined by the subcarrier spacing and the cyclic prefix (CP: Cyclic Prefix) overhead. At this time, the multiple subcarrier spacings may be derived by scaling the basic (reference) subcarrier spacing by an integer N (or μ). Also, even assuming that a very low subcarrier spacing is not used at a very high carrier frequency, the numerology used may be selected independently of the frequency band. Also, in the NR system, various frame structures based on multiple numerologies may be supported.

[0069] The OFDM numerologies and frame structures that can be considered in the NR system will be described below. The multiple OFDM numerologies supported in the NR system may be defined as shown in Table 1 below.

[0070]

Table 1

[0071] NR supports multiple numerologies (or subcarrier spacings (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands. When the SCS is 30 kHz / 60 kHz, it supports dense-urban areas, lower latency, and wider carrier bandwidths. When the SCS is 60 kHz or higher, it supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0072] The NR frequency band is defined as two types (FR1, FR2) of frequency ranges. FR1 and FR2 may be configured as shown in Table 2 below. Also, FR2 can mean millimeter wave (mmW).

[0073]

Table 2

[0074] In relation to the frame structure in the NR system, the sizes of various fields in the time domain are T c = 1 / (Δf max · N f ) times the time unit. Here, Δf max = 480·10 3 Hz, and Nf = 4096. Downlink and uplink transmissions are based on T f = 1 / (Δf max N f / 100)·T c = A radio frame having an interval of 10 ms. Here, each radio frame has T sf =(Δf max N f / 1000)·T c = Consists of 10 subframes each having an interval of 1 ms. In this case, there may be one set of frames for the uplink and one set of frames for the downlink. Also, the transmission at the uplink frame number i from the terminal must start T TA =(N TA +N TA,offset )T c before the start of the corresponding downlink frame at the terminal. For the subcarrier interval configuration μ, a slot is numbered in increasing order of n s μ ∈ {0,..., N slot subframe,μ -1} within a subframe and in increasing order of n s,f μ ∈ {0,..., N slot frame,μ -1} within a radio frame. One slot is composed of N symb slot consecutive OFDM symbols, and N symb slot is determined by the CP. In a subframe, the start of slot n s μ is the OFDM symbol n s μ N symb slotis aligned in time with the start. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in a downlink slot or an uplink slot can be used.

[0075] Table 3 shows the number of OFDM symbols per slot (N symb slot ), the number of slots per radio frame (N slot frame,μ ), and the number of slots per subframe (N slot subframe,μ ) in the normal CP. Table 4 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0076]

Table 3

[0077]

Table 4

[0078] Figure 2 shows an example when μ = 2 (SCS is 60 kHz). Referring to Table 3, one subframe can include 4 slots. The one subframe = {1, 2, 4} slots shown in Figure 2 is an example, and the number of slots that can be included in one subframe is defined as in Table 3 or Table 4. Also, a mini-slot can include 2, 4, or 7 symbols, or more or fewer symbols.

[0079] In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. may be considered. Hereinafter, the physical resources that can be considered in the NR system will be specifically described.

[0080] First, in relation to the antenna port, the antenna port is defined such that the channel through which the symbol on the antenna port is carried can be inferred from the channels through which other symbols on the same antenna port are carried. When the large-scale properties of the channel through which the symbol on one antenna port is carried can be analogized from the channels through which the symbols on other antenna ports are carried, it can be said that the two antenna ports are in a QC / QCL (quasi co-located or quasi co-location) relationship. Here, the large-scale properties include any one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0081] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure is applicable.

[0082] JPEG0007717257000005.jpg106158

[0083] Point A serves as a common reference point for the resource block grid and is obtained as follows.

[0084] - The offsetToPointA for the primary cell (PCell) downlink indicates the frequency offset between the lowest sub - carrier of the lowest resource block that overlaps with the SS / PBCH block used by the terminal for initial cell selection and point A. It is expressed in units of resource blocks assuming a 15 kHz sub - carrier spacing for FR1 and a 60 kHz sub - carrier spacing for FR2.

[0085] - absoluteFrequencyPointA indicates the frequency - position of point A expressed as in the absolute radio - frequency channel number (ARFCN).

[0086] Common resource blocks are numbered upward from 0 in the frequency domain for a sub - carrier spacing setting μ. The center of sub - carrier 0 of common resource block 0 for a sub - carrier spacing setting μ coincides with 'point A'. The relationship between the common resource block number n in the frequency domain CRB μ and the resource element (k, l) for a sub - carrier spacing setting μ is given as in Equation 1 below.

[0087]

Equation

[0088] In Equation 1, k is defined relative to point A such that k = 0 corresponds to the sub - carrier centered at point A. Physical resource blocks are numbered from 0 to N BWP,i size,μ -1 within a bandwidth part (BWP), and i is the number of the BWP. The relationship between physical resource block n in BWP i PRB and common resource block n CRB is given by Equation 2 below.

[0089] [Number]

[0090] N BWP,i start,μ is a common resource block where the BWP starts relative to common resource block 0.

[0091] FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure is applicable. And FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure is applicable.

[0092] Referring to FIGS. 4 and 5, a slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one slot includes 7 symbols, while in the case of extended CP, one slot includes 6 symbols.

[0093] A carrier wave includes a plurality of sub-carriers in the frequency domain. An RB (Resource Block) is defined as a plurality (e.g., 12) of consecutive sub-carriers in the frequency domain. A BWP (Bandwidth Part) is defined as a plurality of consecutive (physical) resource blocks in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier wave can include up to N (e.g., 5) BWPs at most. Data communication is performed on the activated BWP, and only one BWP may be activated for one terminal. Each element in the resource grid is called a resource element (RE:Resource Element), and one complex symbol may be mapped.

[0094] The NR system may support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with the radio frequency (RF) chip for the entire CC turned on, the terminal battery consumption may increase. Alternatively, considering various use cases operating within one wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing, etc.) may be supported for different frequency bands within the CC. Alternatively, the capabilities of terminals may differ with respect to the maximum bandwidth. Considering this, the base station may instruct the terminal to operate only on a partial bandwidth rather than the entire bandwidth of the wideband CC, and this partial bandwidth is defined as the bandwidth part (BWP) for convenience. The BWP may be composed of consecutive resource blocks (RBs) on the frequency axis and may correspond to one numerology (e.g., subcarrier spacing, cyclic prefix length, slot / minislot duration).

[0095] On one hand, the base station can configure multiple BWPs even within one CC configured for a terminal. For example, in the PDCCH monitoring slot, a BWP that occupies a relatively small frequency region can be configured, and the PDSCH indicated by the PDCCH may be scheduled on a larger BWP than that. Alternatively, when UEs concentrate on a specific BWP, other BWPs may be configured for some terminals for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between adjacent cells, etc., a part of the spectrum of the entire bandwidth can be excluded, and both BWPs can be configured within the same slot. That is, the base station can configure at least one DL / UL BWP for a terminal associated with a wideband CC. The base station can activate at least one of the DL / UL BWPs configured at a specific time (by means of L1 signaling or MAC CE (Control Element) or RRC signaling, etc.). In addition, the base station can instruct switching to other configured DL / UL BWPs (by means of L1 signaling or MAC CE or RRC signaling, etc.). Or, when the timer value expires based on a timer, it may switch to a defined DL / UL BWP. At this time, the activated DL / UL BWP is defined as the active DL / UL BWP. However, during the process of the terminal's initial connection (initial access) or before the RRC connection is set up, etc., the terminal may not be able to receive the configuration for the DL / UL BWP. Therefore, the DL / UL BWP assumed by the terminal in such a situation is defined as the initial active DL / UL BWP.

[0096] FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure is applicable and a general signal transmission / reception method using them.

[0097] In a wireless communication system, a terminal receives information from a base station on the downlink, and the terminal transmits information to the base station on the uplink. The information transmitted and received between the base station and the terminal includes data and various control information, and there are various physical channels according to the type / usage of the information they transmit and receive.

[0098] When the terminal is powered on or newly enters a cell, it performs initial cell search (Initial cell search) operations such as synchronizing with the base station (S601). For this purpose, the terminal receives the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS) from the base station to synchronize with the base station and can obtain information such as the cell identifier (ID: Identifier). After that, the terminal can receive the Physical Broadcast Channel (PBCH) from the base station to obtain in-cell broadcast information. On the other hand, the terminal can receive the Downlink Reference Signal (DL RS) in the initial cell search stage to check the downlink channel state.

[0099] After completing the initial cell search, the terminal receives the Physical Downlink Shared Channel (PDSCH) based on the Physical Downlink Control Channel (PDCCH) and the information carried on the PDCCH, and can obtain more specific system information (S602).

[0100] On one hand, when the terminal first connects to the base station or there is no radio resource for signal transmission, the terminal can perform an arbitrary connection process (random access procedure, RACH: Random Access Procedure) with respect to the base station (steps S603 to S606). For this purpose, the terminal transmits a specific sequence as a preamble on the physical random access channel (physical random access channel, PRACH) (S603 and S605), and can receive a response message for the preamble on the PDCCH and the corresponding PDSCH (S604 and S606). In the case of contention-based RACH, furthermore, a contention resolution procedure can be performed.

[0101] After performing the procedure as described above, the terminal can then perform PDCCH / PDSCH reception (S607) and physical uplink shared channel (PUSCH: Physical Uplink Shared Channel) / physical uplink control channel (PUCCH: Physical Uplink Control Channel) transmission (S608) as a general uplink / downlink signal transmission procedure. In particular, the terminal receives downlink control information (DCI: Downlink Control Information) on the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and the formats are different from each other depending on the purpose of use.

[0102] On the other hand, the control information that the terminal transmits to the base station on the uplink or that the terminal receives from the base station includes downlink / uplink ACK / NACK (Acknowledgement / Non-Acknowledgement) signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), and the like. In the 3GPP LTE system, the terminal can transmit control information such as the above-mentioned CQI / PMI / RI on the PUSCH and / or PUCCH.

[0103] Table 5 shows an example of DCI format in the NR system.

[0104]

Table 5

[0105] Referring to Table 5, DCI formats 0_0, 0_1, and 0_2 can include resource information related to PUSCH scheduling (for example, UL / SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block (TB) related information (for example, MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid-Automatic Repeat and request) related information (for example, process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (for example, DMRS sequence initialization information, antenna port, CSI request, etc.), and power control information (for example, PUSCH power control, etc.). The control information included in each DCI format may be defined in advance.

[0106] DCI format 0_0 is used for PUSCH scheduling in one cell. The information included in DCI format 0_0 is transmitted after being CRC (cyclic redundancy check) scrambled by C-RNTI (Cell RNTI:Cell Radio Network Temporary Identifier) or CS-RNTI (Configured Scheduling RNTI) or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI).

[0107] DCI format 0_1 is used to schedule one or more PUSCHs in one cell, or to instruct the terminal with downlink feedback information of a configured grant (CG). The information included in DCI format 0_1 is transmitted after being CRC scrambled by a C-RNTI or a CS-RNTI or an SP-CSI-RNTI (Semi-Persistent CSI RNTI) or an MCS-C-RNTI.

[0108] DCI format 0_2 is used to schedule PUSCH in one cell. The information included in DCI format 0_2 is transmitted after being CRC scrambled by a C-RNTI or a CS-RNTI or an SP-CSI-RNTI or an MCS-C-RNTI.

[0109] Next, DCI formats 1_0, 1_1, and 1_2 can include resource information related to PDSCH scheduling (such as frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.), transmission block (TB) related information (such as MCS, NDI, RV, etc.), HARQ related information (such as process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (such as antenna port, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), PUCCH related information (such as PUCCH power control, PUCCH resource indicator, etc.). The control information included in each DCI format may be defined in advance.

[0110] DCI format 1_0 is used for scheduling the PDSCH in one DL cell. The information included in DCI format 1_0 is transmitted after being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.

[0111] DCI format 1_1 is used for scheduling the PDSCH in one cell. The information included in DCI format 1_1 is transmitted after being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.

[0112] DCI format 1_2 is used for scheduling the PDSCH in one cell. The information included in DCI format 1_2 is transmitted after being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.

[0113] SSB (Synchronization Signal Block) Transmission and Related Operations

[0114] Based on the synchronization signal block (SSB), the terminal can perform cell search, system information acquisition, beam alignment for initial connection, DL measurement, etc. The SSB may be referred to as the SS / PBCH (Synchronization Signal / Physical Broadcast channel) block.

[0115] FIG. 7 illustrates the SSB structure in a wireless communication system to which the present disclosure is applicable.

[0116] Referring to FIG. 7, the SSB is composed of the PSS, SSS, and PBCH. The SS / PBCH block is composed of 4 consecutive OFDM symbols, and the PSS, PBCH, SSS / PBCH, and PBCH are transmitted for each OFDM symbol. The PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and the PBCH is composed of 3 OFDM symbols and 576 subcarriers. Polar coding and QPSK (Quadrature Phase Shift Keying) are applied to the PBCH. The PBCH is composed of data REs and DMRS (Demodulation Reference Signal) REs for each OFDM symbol. There are 3 DMRS REs for each RB, and there are 3 data REs between the DMRS REs.

[0117] The cell search will be described below.

[0118] Cell search means the process by which a terminal acquires time / frequency synchronization of a cell and detects the cell ID (Identifier) of the cell (e.g., Physical layer Cell ID (PCID)). The PSS is used to detect the cell ID within a cell ID group, and the SSS is used to detect the cell ID group. The PBCH is used for SSB (time) index detection and half-frame detection.

[0119] The cell search process of the terminal may be organized as shown in Table 6 below.

[0120]

Table 6

[0121] There are 336 cell ID groups, and there are 3 cell IDs for each cell ID group. There are a total of 1008 cell IDs, and the cell ID may be defined by Equation 3 below.

[0122]

Equation

[0123] Here, N ID cell represents a cell ID (e.g., PCID). N ID (1) represents a cell ID group and is provided / obtained by the SSS. N ID (2) represents a cell ID within the cell ID group and is provided / obtained by the PSS.

[0124] The PSS sequence d PSS (n) may be defined to satisfy the following Equation 4.

[0125]

Equation

[0126] The SSS sequence d SSS (n) may be defined to satisfy the following Equation 5.

[0127]

Equation

[0128] FIG. 8 illustrates SSB transmission in a wireless communication system to which the present disclosure is applicable.

[0129] The SSB is transmitted periodically according to the SSB periodicity. The basic SSB period assumed by the terminal during initial cell search is defined as 20 ms. After cell connection, the SSB period may be set to one of {5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms} by the network (e.g., the base station). An SSB burst set is configured at the start part of the SSB period. The SSB burst set is composed of a 5 ms time window (i.e., a half frame), and the SSB may be transmitted up to L times within the SS burst set. The maximum number of transmissions L of the SSB may be given as follows according to the frequency band of the carrier wave. One slot may contain up to 2 SSBs.

[0130] - For a frequency range up to 3 GHz, L = 4

[0131] - For a frequency range from 3 GHz to 6 GHz, L = 8

[0132] - For a frequency range from 6 GHz to 52.6 GHz, L = 64

[0133] The time position of the SSB candidate within the SS burst set may be defined as follows by the SCS. The time position of the SSB candidate is indexed from 0 to L - 1 in time order within the SSB burst set (SSB index).

[0134] - Case A - 15 kHz SCS: The index of the start symbol of the candidate SSB is given as {2, 8} + 14 * n. When the carrier frequency is 3 GHz or less, n = 0, 1. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1, 2, 3.

[0135] - Case B - 30 kHz SCS: The index of the start symbol of the candidate SSB is given as {4, 8, 16, 20} + 28 * n. When the carrier frequency is 3 GHz or less, n = 0. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1.

[0136] - Case C - 30kHz SCS: The index of the starting symbol of the candidate SSB is given by {2,8}+14*n. When the carrier frequency is 3 GHz or less, n = 0, 1. When the carrier frequency is 3 GHz to 6 GHz, n = 0, 1, 2, 3.

[0137] - Case D - 120kHz SCS: The index of the starting symbol of the candidate SSB is given by {4,8,16,20}+28*n. When the carrier frequency is greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

[0138] - Case E - 240kHz SCS: The index of the starting symbol of the candidate SSB is given by {8,12,16,20,32,36,40,44}+56*n. When the carrier frequency is greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0139] FIG. 9 illustrates that a terminal acquires information related to downlink time synchronization in a wireless communication system to which the present disclosure is applicable.

[0140] The terminal can achieve DL synchronization by detecting an SSB. The terminal can identify the structure of the SSB burst set based on the detected SSB index, thereby detecting symbol / slot / half-frame boundaries. The number of the frame / half-frame to which the detected SSB belongs may be identified using SFN information and half-frame indication information.

[0141] Specifically, the terminal can acquire 10-bit SFN (System Frame Number) information from the PBCH (s0~s9). Among the 10-bit SFN information, 6 bits are obtained from the MIB (Master Information Block), and the remaining 4 bits are obtained from the PBCH TB (Transport Block).

[0142] Next, the terminal can obtain 1-bit half-frame indication information (c0). When the carrier frequency is 3 GHz or less, the half-frame indication information may be implicitly signaled using PBCH DMRS. PBCH DMRS indicates 3-bit information by using one of eight PBCH DMRS sequences. Therefore, when L = 4, out of the 3 bits that can be indicated using eight PBCH DMRS sequences, the 1 bit remaining after indicating the SSB index may be used for half-frame indication purposes.

[0143] Finally, the terminal can obtain the SSB index based on the DMRS sequence and the PBCH payload. The SSB candidates are indexed 0 to L - 1 in chronological order within the SSB burst set (i.e., half-frame). When L = 8 or 64, the 3 least significant bits (LSB) of the SSB index may be indicated using eight different PBCH DMRS sequences (b0 to b2). When L = 64, the 3 most significant bits (MSB) of the SSB index are indicated by the PBCH (b3 to b5). When L = 2, the 2 LSBs of the SSB index may be indicated using four different PBCH DMRS sequences (b0, b1). When L = 4, out of the 3 bits that can be indicated using eight PBCH DMRS sequences, the 1 bit remaining after indicating the SSB index may be used for half-frame indication purposes (b2).

[0144] The following describes system information acquisition.

[0145] FIG. 10 illustrates the system information acquisition process.

[0146] The terminal can obtain access stratum / non-access stratum information through the system information (SI) acquisition process. The SI acquisition process may be applied to terminals in the RRC_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state.

[0147] SI is divided into a Master Information Block (MIB) and a plurality of System Information Blocks (SIBs). SI other than the MIB may be referred to as Remaining Minimum System Information (RMSI) and Other System Information (OSI). RMSI corresponds to SIB1, and OSI refers to SIBs other than SIB1, i.e., SIB2 and above. For detailed matters, the following can be referred to.

[0148] The MIB includes information / parameters related to the reception of SIB1 (SystemInformationBlockType1) and is transmitted via the PBCH of the SS / PBCH block. The information of the MIB may include fields as shown in Table 7.

[0149] Table 7 exemplifies a part of the MIB.

[0150]

Table 7

[0151] Table 8 exemplifies the description of the MIB fields exemplified in Table 7.

[0152]

Table 8

[0153] At the initial cell selection, the terminal assumes that half-frames with SSB are repeated at a period of 20 ms. The terminal can confirm the existence of a CORESET (Control Resource Set) for the Type0-PDCCH common search space (common search space) based on the MIB. The Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit PDCCHs that schedule SI messages. When the Type0-PDCCH common search space exists, the terminal can determine (i) a plurality of consecutive RBs and one or more consecutive symbols that constitute the CORESET, and (ii) a PDCCH opportunity (i.e., the time-domain position for PDCCH reception) based on the information in the MIB (e.g., pdcch-ConfigSIB1). Specifically, pdcch-ConfigSIB1 is 8-bit information, (i) is determined based on the 4 MSB (Most Significant Bit) bits (see 3GPP TS 38.213 Tables 13-1 to 13-10), and (ii) is determined based on the 4 LSB (Least Significant Bit) bits (see 3GPP TS 38.213 Tables 13-11 to 13-15).

[0154] As an example, the information indicated by the 4 MSB bits of pdcch-ConfigSIB1 is exemplified as follows.

[0155] The setting of the CORESET for the Type0-PDCCH common search space is:

[0156] i) A plurality of tables are defined by the subcarrier spacing and the channel minimum bandwidth.

[0157] ii) Indicates the multiplexing pattern between the SS / PBCH block and the PDCCH / PDSCH.

[0158] - Pattern 1: All SCS combinations for FR1 and all SCS combinations for FR2

[0159] - Pattern 2: Different SCS combinations for FR2 (excluding the combination of 60 kHz for the first DL BWP and 240 kHz SCS for the SS / PBCH block)

[0160] - Pattern 3: The same SCS combination for FR2 (in the case of 120 kHz SCS)

[0161] iii) Indicate the number of PRBs and the number of OFDM symbols for the CORESET.

[0162] - N RB CORESET : The number of RBs (i.e., {24, 48, 96})

[0163] - N Symb CORESET : The number of symbols (i.e., {1, 2, 3})

[0164] iv) Indicate the offset (number of RBs) between the first RB of the SS / PBCH block and the first RB of the RMSI CORESET.

[0165] - The range of the offset (number of RBs) is determined by the number of PRBs and the sync raster.

[0166] - Design to align the center of the SS / PBCH block and the center of the RMSI CORESET as close as possible.

[0167] When there is no Type0-PDCCH common search space, pdcch-ConfigSIB1 provides information about the frequency position where the SSB / SIB1 exists and the frequency range where the SSB / SIB1 does not exist.

[0168] In the initial cell selection, the UE can assume that half-frames in which SS / PBCH blocks exist occur with a period of two frames. At the time of detecting an SS / PBCH block, for FR1 (Sub-6GHz; 450~6000MHz), if k SSB ≤23, and for FR2 (mm-Wave, 24250~52600MHz), if k SSB ≤11, the UE determines that there exists a control resource set for the Type0-PDCCH common search space. For FR1, if k SSB >23, and for FR2, if k SSB >11, the UE determines that there does not exist a control resource set for the Type0-PDCCH common search space. k SSB indicates the frequency / sub-carrier offset between sub-carrier 0 of the SS / PBCH block and sub-carrier 0 of the common resource block for the SSB. In FR2, only up to 11 values can be applied. k SSB may be signaled in the MIB. SIB1 includes information related to the availability and scheduling (e.g., transmission period, SI window size) of the remaining SIBs (hereinafter, SIBx, where x is an integer greater than or equal to 2). For example, SIB1 can inform whether SIBx is broadcast periodically or provided on-demand in response to a terminal request. When SIBx is provided on-demand, SIB1 may include information necessary for the terminal to make an SI request. SIB1 is transmitted via the PDSCH, the PDCCH that schedules SIB1 is transmitted in the Type0-PDCCH common search space, and SIB1 is transmitted via the PDSCH indicated by the PDCCH.

[0169] SIBx is included in the SI message and transmitted via the PDSCH. Each SI message is transmitted within a time window (i.e., SI-window) that occurs periodically.

[0170] PDCCH Transmission / Reception Method

[0171] - PUSCH: Physical Uplink Shared Channel

[0172] - RRM: Radio resource management

[0173] - SCS: Sub-carrier spacing

[0174] - RLM: Radio link monitoring

[0175] - DCI: Downlink Control Information

[0176] - CAP: Channel Access Procedure

[0177] - Ucell: Unlicensed cell

[0178] - TBS: Transport Block Size

[0179] - TDRA: Time Domain Resource Allocation

[0180] - SLIV: Starting and Length Indicator Value (This is an indication value for the starting symbol index and the number of symbols within a slot of PDSCH and / or PUSCH. It may be set as a component of an entry that constitutes the TDRA field in the PDCCH that schedules the PDSCH and / or PUSCH.)

[0181] - BWP: Bandwidth Part (It may be composed of contiguous resource blocks (RBs) on the frequency axis. It may correspond to one numerology (e.g., SCS, CP length, slot / mini-slot duration, etc.). Also, multiple BWPs may be configured for one carrier (the number of BWPs per carrier may also be limited), but the number of activated BWPs may be limited to a part (e.g., 1) per carrier.)

[0182] - CORESET: Control Resource Set (It means the time-frequency resource area where PDCCH can be transmitted, and the number of CORESETs per BWP may be limited.)

[0183] - REG: Resource element group

[0184] - SFI: Slot Format Indicator (It is an indicator that indicates the symbol-level DL / UL direction within a specific slot and is transmitted by group common PDCCH.)

[0185] - COT: Channel occupancy time

[0186] - SPS: Semi-persistent scheduling

[0187] - PLMN ID: Public Land Mobile Network identifier

[0188] As more communication devices require larger communication capacities, the efficient utilization of limited frequency bands has become an increasingly important need in the next-generation wireless communication system. Cellular communication systems such as the LTE / NR system are also considering solutions to utilize unlicensed bands such as the 2.4 GHz band mainly used by existing Wi-Fi systems or newly attracting attention, such as the 5 GHz and 60 GHz bands, for traffic offloading. Basically, since unlicensed bands assume a method of wireless transmission and reception by competition between communication nodes, each communication node is required to perform channel sensing before transmitting a signal to confirm that no other communication node is transmitting a signal. For convenience, such an operation is called LBT (listen before talk) or a channel access procedure (CAP: channel access procedure). In particular, the operation of confirming whether another communication node is transmitting a signal is defined as carrier sensing (CS), and the case where it is determined that no other communication node is transmitting a signal is defined as when clear channel assessment (CCA) is confirmed. In the following description, LBT may be replaced by CAP. The eNB / gNB or UE of the LTE / NR system must also perform LBT for signal transmission in the unlicensed band (for convenience, referred to as the U-band). Similarly, when the eNB / gNB or UE of the LTE / NR system transmits a signal, other communication nodes such as Wi-Fi (or WiGig (Wireless Gigabit Alliance) such as 802.11ad / ay) must also perform LBT and must not cause interference. For example, in the Wi-Fi standard (802.11ac), the CCA threshold is defined as -62 dBm for non-Wi-Fi signals and -82 dBm for Wi-Fi signals. This means that the STA and AP do not transmit signals so as not to cause interference, for example, when a non-Wi-Fi signal is received with a power of -62 dBm or more.

[0189] The 3GPP Rel-15 (release-15) NR system defines operations in the frequency band below 52.6 GHz. Discussions are underway for future releases to operate the NR system in licensed and / or unlicensed bands of the 60 / 70 GHz band (specifically, the frequency band above 52.6 GHz, or the frequency band from 52.6 GHz to 71 GHz). In the present disclosure, for convenience, this band is referred to as frequency range 2-2 (FR 2-2), and an initial connection method including SS / PBCH block (block) transmission and reception, and SIB1 PDCCH / PDSCH transmission and reception on the FR 2-2 frequency band is proposed.

[0190] In the Rel-15 NR system, the mmWave band (e.g., above 7.125 or 24.25 GHz, up to 52.6 GHz) is defined as FR2 (frequency range 2), and the sub-carrier spacing (SCS) of the SS / PBCH block in this band may be 120 or 240 kHz.

[0191] FIG. 11 illustrates the transmission of an SS / PBCH block in a wireless communication system to which the present disclosure is applicable.

[0192] In FIG. 11, the SS / PBCH block transmission for each SCS in FR2 is illustrated at the symbol level on the time axis (time domain).

[0193] Specifically, as shown in FIG. 11, up to 4 or 8 SS / PBCH blocks may be transmitted within 0.25 msec (e.g., 2 slots based on 120 kHz SCS, 4 slots based on 240 kHz SCS).

[0194] Referring to FIG. 11, for example, based on the 120 kHz SCS, the SS / PBCH block (candidate) index n may be transmitted in symbols 4 / 5 / 6 / 7 of the first slot, and the SS / PBCH block (candidate) index n+1 may be transmitted in symbols 8 / 9 / 10 / 11 of the first slot. Then, the SS / PBCH block (candidate) index n+2 may be transmitted in symbols 2 / 3 / 4 / 5 of the second slot, and the SS / PBCH block (candidate) index n+3 may be transmitted in symbols 6 / 7 / 8 / 9 of the second slot.

[0195] Also, for example, based on the 240 kHz SCS, the SS / PBCH block (candidate) index n may be transmitted in symbols 8 / 9 / 10 / 11 of the first slot, the SS / PBCH block (candidate) index n+1 may be transmitted in symbols 12 / 13 of the first slot and symbols 0 / 1 of the second slot, the SS / PBCH block (candidate) index n+2 may be transmitted in symbols 2 / 3 / 4 / 5 of the second slot, and the SS / PBCH block (candidate) index n+3 may be transmitted in symbols 6 / 7 / 8 / 9 of the second slot. Then, the SS / PBCH block (candidate) index n+4 may be transmitted in symbols 4 / 5 / 6 / 7 of the third slot, the SS / PBCH block (candidate) index n+5 may be transmitted in symbols 8 / 9 / 10 / 11 of the third slot, the SS / PBCH block (candidate) index n+6 may be transmitted in symbols 12 / 13 of the third slot and symbols 0 / 1 of the fourth slot, and the SS / PBCH block (candidate) index n+7 may be transmitted in symbols 2 / 3 / 4 / 5 of the fourth slot.

[0196] FIG. 12 illustrates the transmission of SS / PBCH blocks in a wireless communication system to which the present disclosure is applicable.

[0197] FIG. 11 above shows the SS / PBCH block transmission at the symbol level on the time axis (time domain) for each SCS, and FIG. 12 shows the SS / PBCH block transmission at the slot level on the time axis for each SCS.

[0198] Figure 12(b) is an enlarged view of part A (the first half 2.5 msec) in Figure 12(a), and Figure 12(b) is an enlarged view of part B (the second half 2.5 msec) in Figure 12(a).

[0199] In the present disclosure, for convenience of explanation, it is assumed that a window (for convenience, referred to as S_window) in which an SS / PBCH block can be transmitted is a 5 msec window (see Figure 12(a)). However, the duration of the window may be set by the base station to other values (for example, 0.5 msec, 1 / 2 / 3 / 4 msec, etc.).

[0200] Referring to Figure 12(a), there are a total of 40 slots (for example, slots 0 to 39) within a 5 msec window based on a 120 kHz SCS, and an SS / PBCH block may be transmitted in 8 consecutive slots. There is a 2-slot gap (for example, slots 8 to 9) between the 8 consecutive slots (for example, slots 0 to 7, 10 to 17). Here, out of the 8 consecutive slots (for example, slots 0 to 7) in which an SS / PBCH block can be transmitted, up to 4 SS / PBCH blocks may be transmitted in 2 slots (for example, slots 0 to 1 / 2 to 3 / 4 to 5 / 6 to 7) like the 120 kHz in Figure 11.

[0201] Similarly, there are a total of 80 slots (for example, slots 0 to 79) within a 5 msec window based on a 240 kHz SCS, and an SS / PBCH block may be transmitted in 16 consecutive slots. There is a 4-slot gap (for example, slots 16 to 19) between the 16 consecutive slots (for example, slots 0 to 15 / 20 to 35). Here, out of the 16 consecutive slots (for example, slots 0 to 15) in which an SS / PBCH block can be transmitted, up to 8 SS / PBCH blocks may be transmitted in 4 slots (for example, slots 0 to 3 / 4 to 7 / 8 to 11 / 12 to 15) like the 240 kHz in Figure 11.

[0202] That is, the number of maximum SS / PBCH block (candidate) indexes allowed with 120 kHz and 240 kHz SCS may be limited to 64, and out of the maximum 64, which SS / PBCH block actually corresponds to which index may be set by cell-specific or UE-specific RRC signalling.

[0203] Even if the NR system is extended to be operable in FR 2-2, the SCS for the SS / PBCH block may apply 120 kHz SCS, similar to that defined in the existing Rel-15 NR FR2. Further, considering wideband operation reaching a 2 GHz bandwidth (roughly 2.16 GHz), 480 kHz and 960 kHz may also be further considered for the SCS for the SS / PBCH block. Here, in the present disclosure, a method for scheduling the transmission pattern of the SS / PBCH block, system information (data), the PDCCH monitoring position setting for scheduling system information (data) (that is, the setting of the monitoring occasion of CORESET#0 using the type0-PDCCH common search space (CSS) set), the system information (data) scheduling method, etc. will be proposed.

[0204] Aspects such as a method for a terminal to obtain serving cell timing, a method for a terminal to acquire a quasi-co-location (QCL) relationship between SS / PBCH blocks, or a method for notifying a terminal of the index of the actually transmitted SS / PBCH block (candidate) among up to 64 SS / PBCH blocks may also be described. In the present disclosure, two SS / PBCH blocks being in a QCL relationship means that the terminal can assume that the two SS / PBCH blocks have the same (large-scale) channel properties (e.g., average gain, Doppler shift, Doppler spread, average delay, delay spread, spatial Rx parameter (i.e., receive beam), etc.).

[0205] Embodiment 1: When {SS / PBCH block SCS, CORESET index 0 SCS} = {120, 120} kHz, propose the time-axis resource setting of CORESET index 0 corresponding to each SS / PBCH block and the basic (default) physical downlink shared channel (PDSCH) time domain resource allocation (TDRA) value.

[0206] FIG. 13 is a diagram illustrating the setting of CORESET index 0 according to an embodiment of the present disclosure.

[0207] For the CORESET index 0 and the type0-PDCCH search space (SS) set as shown in FIG. 13, it may be set by the PBCH. The slot index n value may be all or part of the n values that result in a 0 value when taking modulo 2 operation (e.g., n = 0, 2, 4, 6,...).

[0208] The CORESET index 0 corresponding to the SS / PBCH block k (symbols 4 / 5 / 6 / 7 in slot n in Fig. 13) may be set to symbols 0 / 1 in slot n. The CORESET index 0 corresponding to the SS / PBCH block k+1 (symbols 8 / 9 / 10 / 11 in slot n in Fig. 13) may be set to symbols 2 / 3 in slot n. Further, a 1-symbol CORESET instead of a 2-symbol CORESET may be set. For example, the 1-symbol CORESET index 0 corresponding to the SS / PBCH block k may be set to symbol 0 or 1 in slot n. Also, the 1-symbol CORESET index 0 corresponding to the SS / PBCH block k+1 may be set to symbol 1 or 2 in slot n.

[0209] The CORESET index 0 corresponding to the SS / PBCH block k+2 (symbols 2 / 3 / 4 / 5 in slot n+1 in Fig. 13) may be set to symbols 12 / 13 in slot n. The CORESET index 0 corresponding to the SS / PBCH block k+3 (symbols 6 / 7 / 8 / 9 in slot n+1 in Fig. 13) may be set to symbols 0 / 1 in slot n+1. Further, a 1-symbol CORESET instead of a 2-symbol CORESET may be set. For example, the 1-symbol CORESET index 0 corresponding to the SS / PBCH block k+2 may be set to symbol 12 or 13 in slot n. Also, the 1-symbol CORESET index 0 corresponding to the SS / PBCH block k+3 may be set to symbol 13 in slot n or symbol 0 in slot n+1.

[0210] The method may be applicable when the multiplexing pattern between the SS / PBCH block (SSB) and the CORESET is a TDM pattern (i.e., SS / PBCH block and CORESET multiplexing pattern 1) and / or an FDM pattern (i.e., SS / PBCH block and CORESET multiplexing pattern 3). Thereby, (even when it is a TDM pattern) by transmitting the SS / PBCH block and the corresponding CORESET index 0 in the same (continuous) burst (for example, by continuously transmitting the SS / PBCH block and the corresponding CORESET index 0), it can be advantageous especially when the channel should be occupied at a predetermined time after CAP completion, such as in an unlicensed band.

[0211] As shown in Table 9 and Table 10 below excerpted from 3GPP TS 38.214 document, before receiving UE-specific RRC signaling, the terminal utilizes the default table to confirm the time-axis resource allocation. For example, referring to Table 9, when the RNTI of the PDCCH is the SI-RNTI for receiving SIB1 or RMSI, etc., if it is the SS / PBCH block and CORESET multiplexing pattern 1 (i.e., TDM between the SS / PBCH block and CORESET index 0), the TDRA (time domain resource allocation) for the corresponding PDSCH follows the default A parameter set, which is as shown in Table 10 below (hereinafter, the default TDRA table).

[0212] The TDRA method proposed in this embodiment may be applicable only to the PDSCH scheduled by CORESET index 0 before receiving the SLIV-related RRC signaling. More characteristically, (before receiving the SLIV-related RRC signaling) it may be applicable only to the PDSCH carrying system information (or paging message or random access response message).

[0213] Table 9 shows the applicable PDSCH time domain resource allocation defined in 3GPP TS 38.214.

[0214]

Table 9

[0215] Table 10 illustrates the basic (default) PDSCH time domain resource allocation A for normal cyclic prefix (CP) defined in 3GPP TS 38.214.

[0216]

Table 10

[0217] In the basic TDRA table (i.e., Table 10), the RRC parameter dmrs-TypeA-position may be signaled on the PBCH. If dmrs-TypeA-position = 2, it means that the first DM-RS symbol of PDSCH mapping type A is the third symbol within the slot, and if dmrs-TypeA-position = 3, it can mean that the first DM-RS symbol of PDSCH mapping type A is the fourth symbol within the slot. Basically, for PDSCH mapping type B, the first symbol of PDSCH is a DM-RS symbol. The fact that K0 is 0 means that the PDSCH and the PDCCH scheduling the PDSCH are located in the same slot. S and L respectively mean the starting symbol index and the number of consecutive symbols of PDSCH within the slot.

[0218] When transmitting an SS / PBCH block as shown in FIG. 13 and the corresponding CORESET index 0, it may be more advantageous (especially when considering the case where the channel should be occupied at a predetermined time after CAP completion, such as in an unlicensed band) to schedule the PDSCH scheduled by the PDCCH within the CORESET to also belong to the same (continuous) burst (e.g., when transmitting the SS / PBCH block and the corresponding CORESET index 0, the PDSCH scheduled by the PDCCH within the CORESET is also transmitted continuously). To support this, on the basic TDRA table (i.e., FIG. 10), all or part of the following {K0, S, L} values may be signaled (e.g., by RRC signaling, etc.). For example, when operating in a licensed band, the basic TDRA table (i.e., FIG. 10) may be used as it is.

[0219] On the other hand, when operating in an unlicensed band, among the basic TDRA table (i.e., FIG. 10), when transmitting the SS / PBCH block and the corresponding CORESET index 0, the {K0, S, L} of the row index corresponding to the PDSCH TDRA that does not belong to the same (continuous) burst (e.g., the PDSCH TDRA that is not scheduled continuously) may be replaced or analyzed to be replaced with the following {K0, S, L}.

[0220] Alternatively, when not in the FR 2-2 band, the basic TDRA table (i.e., FIG. 10) may be used as it is. On the other hand, in the FR 2-2 band, it may be analyzed that some row indices of the existing basic TDRA table (i.e., FIG. 10) are replaced or will be replaced with the following {K0, S, L}.

[0221] - {0, 4, 4} (e.g., for SSB k): For example, it may be applied (replaced) when the dmrs-TypeA-Position value is both 2 and 3 at index 7 in Table 10. And / or, it may be applied (replaced) when it is another index value (e.g., 9 or 10).

[0222] - {0,8,4} (for example, for SSB k+1)

[0223] - {1,2,4} (for example, for SSB k+2): For example, in the case of index 14 in Table 10, the S and L values are the same, but only the K0 value is different. Therefore, in the case of index 14, the {1,2,4} value may be applied (alternatively).

[0224] - {0,6,4} (for example, for SSB k+3): For example, it may be applied (alternatively) when the dmrs-TypeA-Position value is both 2 and 3 at index 7 in Table 10. And / or, it may be applied (alternatively) when it is another index value (for example, 9 or 10).

[0225] On the other hand, when the RNTI of PDCCH is the SI-RNTI for receiving SIB1 or RMSI, etc., if the SS / PBCH block and CORESET multiplexing pattern 3 (that is, the same numerology FDM between the SS / PBCH block and CORESET index 0) is used, the TDRA (time domain resource allocation) for the corresponding PDSCH follows the basic C parameter set, which is as shown in Table 11 below (hereinafter, the basic TDRA table C).

[0226] The TDRA method proposed in this embodiment may be applied only to the PDSCH scheduled at CORESET index 0 before receiving the SLIV-related RRC signaling. More characteristically, (before receiving the SLIV-related RRC signaling), it may be applied only to the PDSCH carrying system information (or paging message or random access response message).

[0227] Table 11 illustrates the basic (default) PDSCH time domain resource allocation C defined in 3GPP TS 38.214.

[0228]

Table 11

[0229] In the basic TDRA Table C (i.e., Table 11), the RRC parameter dmrs-TypeA-position may be signaled by the PBCH. If dmrs-TypeA-position = 2, it can be meant that the first DM-RS symbol of PDSCH mapping type A is the third symbol in the slot; if dmrs-TypeA-position = 3, it can be meant that the first DM-RS symbol of PDSCH mapping type A is the fourth symbol in the slot. Basically, for PDSCH mapping type B, the first symbol of the PDSCH is a DM-RS symbol. The fact that K0 is 0 means that the PDSCH and the PDCCH scheduling the PDSCH are located in the same slot. S and L respectively mean the starting symbol index of the PDSCH in the slot and the number of consecutive symbols.

[0230] As shown in FIG. 13 above, when transmitting the SS / PBCH block and the corresponding CORESET index 0, it can be advantageous (especially when considering the case where the channel should be occupied at a predetermined time after CAP completion, such as in an unlicensed band) to schedule the PDSCH scheduled by the PDCCH in the CORESET to also belong to the same (continuous) burst (e.g., to be transmitted continuously). To support this, on the basic TDRA table (i.e., Table 11), all or some of the following {K0, S, L} values may be signaled (e.g., by RRC signaling, etc.). For example, when operating in a licensed band, the basic TDRA Table C (i.e., Table 11) may be used as it is.

[0231] On one hand, when operating in the unlicensed band, among the basic TDRA tables (i.e., Table 11), when transmitting the SS / PBCH block and the corresponding CORESET index 0, it may be analyzed that the {K0, S, L} of the row index corresponding to the PDSCH TDRA that does not belong to the same (continuous) burst (e.g., the PDSCH TDRA that is not scheduled continuously) is replaced by the following {K0, S, L}.

[0232] Alternatively, when not in the FR 2-2 band, the basic TDRA table C (i.e., Table 11) may be used as it is. On the other hand, in the case of the FR 2-2 band, it may be analyzed that some row indexes of the existing basic TDRA table C (i.e., Table 11) are replaced by the following {K0, S, L}.

[0233] - {0, 4, 4} (e.g., for SSB k)

[0234] - {0, 8, 4} (e.g., for SSB k + 1)

[0235] - {1, 2, 4} (e.g., for SSB k + 2): For example, when the index is 8, the S and L values are the same, but only the K0 value is different. So, when the index is 8, the {1, 2, 4} value may be applied (replaced). Alternatively, when the index is 6 or 7 in the reserved state, the {1, 2, 4} value may be applied (replaced).

[0236] - {0, 6, 4} (e.g., for SSB k + 3)

[0237] The method proposed in the above-described Example 1 may also be applied when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz and / or when {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz. That is, when the SS / PBCH block pattern as shown in FIG. 13 above is also applicable to 480 and / or 960 kHz SCS, the time-axis resource setting of CORESET index 0 and the setting method of the basic TDRA table may be applied as in the method proposed in the above-described Example 1.

[0238] Example 2: When {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, particularly when TDM is performed between the SS / PBCH block and CORESET index 0, a proposal is made for the type0-PDCCH CSS set setting.

[0239] In the existing Rel-15 NR system, for FR2, when TDM is performed between the SS / PBCH block and CORESET index 0, the monitoring occasion of the type0-PDCCH CSS set is determined as follows.

[0240] For operation without shared spectrum channel access and for the SS / PBCH block and CORESET multiplexing pattern 1, the UE monitors the PDCCH within the Type0-PDCCH CSS set over two consecutive slots starting from slot n0. For the SS / PBCH block with index i, the UE determines the index of slot n0 as n0 = (O·2 μ + floor(i·M)) mod N slot frame,μ as such. Here, if floor((O·2 μ((i·M)+floor) / N slot frame,μ If )mod2 = 0, then n0 is the SFN C System Frame Number (SFN) SFN that satisfies mod2 = 0 C is determined within a frame having. Or, if floor((O·2 μ ((i·M)+floor) / N slot frame,μ )mod2 = 1, then n0 is the SFN C is determined within a frame having an SFN that satisfies mod2 = 1. M and O are provided by Table 12 (for FR1) and Table 13 (for FR2), and are based on SCS μ ∈ {0,1,2,3} for PDCCH reception within the CORESET. The index for the first symbol of the CORESET within slots n0 and n0 + 1 is the first symbol index provided by Table 12 (for FR1) and Table 13 (for FR2).

[0241] For operations involving shared spectrum channel access, and for SS / PBCH block and CORESET multiplexing pattern 1, the UE monitors the PDCCH within the Type0-PDCCH CSS set over slots including a Type0-PDCCH monitoring opportunity associated with an SS / PBCH block that is QCL with the SS / PBCH block providing the CORESET for the Type0-PDCCH CSS set, in relation to average gain, QCL "typeA" and "typeD" characteristics. For JPEG0007717257000018.jpg536, two consecutive slots starting from slot n0 include an associated Type0-PDCCH monitoring opportunity. The UE determines the index of slot n0 as in JPEG0007717257000019.jpg5115. Here, if JPEG0007717257000020.jpg5148, then n0 is the SFNC The system frame number (SFN) that satisfies mod2 = 0, SFN C is determined within a frame having. Or, if JPEG0007717257000021.jpg5147, then n0 is the SFN C is determined within a frame having an SFN that satisfies mod2 = 1. M and O are provided by Table 12 and are based on SCS μ ∈ {0,1} for PDCCH reception within the CORESET. The index for the first symbol of the CORESET within slots n0 and n0 + 1 is the first symbol index provided by Table 12. N SSB QCL When N = 1, the UE does not expect to be set with M = 1 / 2 or M = 2.

[0242] Table 12 illustrates the parameters for PDCCH monitoring opportunities for a Type0-PDCCH CSS set when {SS / PBCH block SCS, CORESET index 0 SCS} = {X,X} kHz (X is any one of {15, 30, 60, 120}) in the SS / PBCH block and CORESET multiplexing pattern 1 and FR1 defined in 3GPP TS 38.214.

[0243]

Table 12

[0244] Table 13 illustrates the parameters for PDCCH monitoring opportunities for a (XType0-PDCCH CSS set when {SS / PBCH block SCS, CORESET index 0 SCS} = {X,X} kHz (X is any one of {15, 30, 60, 120}) in the SS / PBCH block and CORESET multiplexing pattern 1 and FR2 defined in 3GPP TS 38.214.

[0245]

Table 13

[0246] As described above, the time-axis (i.e., in the time domain) distance between the slot index including the SS / PBCH block index 0 and the slot index including the monitoring occasion of the CORESET index 0 corresponding to the SS / PBCH block index 0 may be approximately Omsec. And the O value may be indicated by Table 13. The O value can mean the distance (interval, offset) in the time domain between the slots (indexes) including the PDCCH monitoring occasion. The time taken to transmit all 64 SS / PBCH block indexes may be approximately 5 msec at 120 kHz SCS, whereas it may be approximately 1 msec at 480 kHz SCS. That is, as the SCS increases, the time taken to transmit all the SS / PBCH block (candidate) indexes can become shorter. Considering this, an O value that is smaller as the SCS increases may be required. That is, by allowing a smaller O value setting and reducing the relative distance between the SS / PBCH block and the CORESET index 0, efficient initial access-related channel transmission and reception can be enabled.

[0247] Specifically, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, a common scaling factor K (e.g., K = 1 / 2, 1 / 4, or 1 / 5) value may be applied to the O value in Table 13.

[0248] For example, if K = 0.5, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, the O values for each index may be as shown in Table 14 below (or may be analyzed as shown in Table 14 below).

[0249] Here, Table 14 exemplifies the case where a scaling factor is applied to all row indices for convenience of explanation. However, the scaling factor may be applied only to some row indices (for example, row indices 2, 3, and 7 where the O value is 2.5), and the O values on the remaining some row indices may be maintained the same as in Table 13 above.

[0250] Table 14 exemplifies the parameters for PDCCH monitoring opportunities for a Type0-PDCCH CSS set according to an embodiment of the present disclosure (for example, in SS / PBCH block and CORESET multiplexing pattern 1 and FR 2-2).

[0251]

Table 14

[0252] Referring to Table 14, the O value may be determined based on the information for determining the PDCCH monitoring opportunity within the MIB (that is, the index in Table 14 above) and {SS / PBCH block SCS, CORESET index 0 SCS}. As described above, for example, the PDCCH configuration information within the MIB (for example, pdcch-ConfigSIB1) may include the information for determining the PDCCH monitoring opportunity (information regarding the index), a plurality of consecutive RBs constituting the CORESET of the Type0-PDCCH CSS set, and information regarding one or more consecutive symbols.

[0253] As shown in Table 14, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz and {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, all or part of the candidate O values in Table 13 may be defined by applying a common scaling factor to the candidate O values when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}).

[0254] On the other hand, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, different scaling factor K values may be applied to the O values in Table 13 according to the SCS.

[0255] For example, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz, a scaling factor K1 (e.g., K1 = 0.5, or K1 = 0.25) value may be applied to all the O values in Table 13. However, when {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, a scaling factor K2 (e.g., K2 = K1 / 2) value may be applied to all the O values in Table 13.

[0256] Or, the scaling factor K (i.e., K1 for 480 kHz SCS and K2 for 960 kHz SCS) may be applied only to some row indices (e.g., row indices 2, 3, 7 where the O value is 2.5), and the O values for the remaining part of the row indices may be maintained the same as in Table 13.

[0257] In other words, depending on whether the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined by applying different scaling factors to the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (X is any one of {15, 30, 60, 120}). For example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.5. As another example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.25.

[0258] That is, depending on whether the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined to be different from each other. Here, all or part of the candidate O values may be defined to be smaller when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz than when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz. Or, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined to be inversely proportional to the {SCS of the SS / PBCH block, SCS of the PDCCH}. For example, for row indices 2, 3, and 7, a specific candidate O value may be defined as 1.25 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz and 0.625 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz.

[0259] Or, when {SS / PBCH block SCS,CORESET index 0 SCS} = {480,480} kHz or {SS / PBCH block SCS,CORESET index 0 SCS} = {960,960} kHz, for some O values in Table 13 above (for example, row indices 2, 3, 7 where the O value is 2.5), as described above, i) different scaling factor K1, K2 values for each SCS, or ii) a common scaling factor K value regardless of SCS is applied, and some O values may be replaced with specific values.

[0260] For example, in the previous Table 13, when the O value is 2.5 and / or 5, a scaling factor (for example, i) K = 0.5 common for 480 / 960 kHz SCS, or ii) K1 = 0.5 for 480 kHz SCS and K2 = 0.25 for 960 kHz SCS) is applied, and when the O value is 7.5, it may be replaced with 5. In this case, the O value for each index may be as shown in Table 15 below (or may be analyzed as follows).

[0261] Table 15 illustrates the parameters for PDCCH monitoring opportunities for a Type0-PDCCH CSS set according to an embodiment of the present disclosure (for example, in SS / PBCH block and CORESET multiplexing pattern 1 and FR 2-2).

[0262]

Table 15

[0263] Referring to Table 15, the O value may be determined based on the information for determining the PDCCH monitoring opportunity in the MIB (i.e., the index of Table 14) and {SS / PBCH block SCS, CORESET index 0 SCS}. As described above, for example, the PDCCH configuration information in the MIB (e.g., pdcch-ConfigSIB1) may include the information for determining the PDCCH monitoring opportunity (information regarding the index), the plurality of consecutive RBs constituting the CORESET of the Type0-PDCCH CSS set, and information regarding one or more consecutive symbols.

[0264] In Table 15, an example is illustrated where a scaling factor common to some O values (e.g., K = 0.5 for 480 / 960 kHz) is applied, and some O values are replaced with specific values (e.g., 5). However, as described above, different scaling factors (e.g., K1 = 0.5 for 480 kHz SCS, K2 = 0.25 for 960 kHz) may be applied to some O values according to the SCS.

[0265] In other words, depending on whether {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz, all or part of the candidate O values may be defined by applying different scaling factors to the values when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}). For example, when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz, all or part of the candidate O values may be defined as the values when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz multiplied by 0.5. As another example, when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz, all or part of the candidate O values may be defined as the values when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz multiplied by 0.25.

[0266] That is, depending on whether {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz, all or part of the candidate O values may be defined to be different from each other. Here, all or part of the candidate O values may be defined to be smaller when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz than when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz. Alternatively, when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz, all or part of the candidate O values may be defined to be inversely proportional to {the SCS of the SS / PBCH block, the SCS of the PDCCH}.

[0267] As yet another example, for the set of O values {0, 2.5, 5, 7.5} signaled in Table 13 above, one of the following option methods may be used: i) substitution (e.g., the O = 2.5 in row index 2 of Table 13 is changed to another value (e.g., 2.5 / K)), or ii) interpretation (e.g., the O = 2.5 value itself in row index 2 of Table 13 is not changed, but when row index 2 is indicated, the actual O value is interpreted as another value (e.g., 2.5 / K)).

[0268] - Option 1 (Opt 1): {0, 2.5 / K, 5 / K, 5}

[0269] The 7.5 in Table 13 above may be replaced or analyzed with 5 (which is the half frame boundary). And the 2.5 and 5 in Table 13 may be replaced or analyzed with 2.5 / K and 5 / K respectively. Here, the scaling factor K value may be common (such as K = 2, 4, or 5 etc.) regardless of the SCS, or may have different values for different SCSs (for example, K = K1 for 480kHz SCS, K = K2 = K1*2 for 960kHz SCS, where K1 = 2 or 4 or 5). Or, in this option, the O value for each row index in Table 13 may be replaced or analyzed with one of the values in {0, 2.5 / K, 5 / K, 5}.

[0270] - Opt 2: {0, 2.5 / K, 5, 7.5 / K}

[0271] (Which is the half frame boundary) The 0 and 5 in Table 13 are maintained, and the 2.5 and 7.5 in Table 13 may be replaced or analyzed with 2.5 / K and 7.5 / K respectively. Here, the scaling factor K value may be common (such as K = 2, 4, or 5 etc.) regardless of the SCS, or may have different values for different SCSs (for example, K = K1 for 480kHz SCS, K = K2 = K1*2 for 960kHz SCS, where K1 = 2 or 4 or 5). Or, in this option, the O value for each row index in Table 13 may be replaced or analyzed with one of the values in {0, 2.5 / K, 5, 7.5 / K}.

[0272] - Opt3: {P*0, P*1 / 4, P*1 / 2, P*3 / 4}

[0273] In the existing Table 13, P = 10. However, when the SCS is 480 / 960 kHz, the P value may change. Here, the P value may be common (P = 5, 2.5, etc.) regardless of the SCS, or may have different values for different SCSs (for example, P = P1 for 480 kHz SCS, P = P2 = P1 / 2 for 960 kHz SCS, P1 = 2.5 or 5 or 1.25). If, for example, P = 2.5 for 480 kHz SCS and P = 1.25 for 960 kHz SCS, the set of O values {0, 2.5, 5, 7.5} signaled in Table 13 may be replaced or analyzed as {0, 0.625, 1.25, 1.875} for 480 kHz SCS and {0, 0.3125, 0.625, 0.9375} for 960 kHz SCS. Alternatively, in this option, the O value for each row index in Table 13 may be replaced or analyzed with one of the values {P*0, P*1 / 4, P*1 / 2, P*3 / 4}. In this option, one of the four proposed values (for example, P*3 / 4) may be replaced with 5.

[0274] - Opt 4: {0, M / K, 5, N / K}

[0275] 0 and 5 in Table 13 are maintained, and 2.5 and 7.5 in Table 13 may be replaced or analyzed with M / K and N / K, respectively. With 0 and 5, which are half-frame boundaries, maintained, the values between them may be specified as M and N. For example, {M, N} may be one of {1.25, 2.5}, {0.5, 1}, {1.5, 3}, {1.5, 3.5}, {1.75, 3.5}, {1, 3}, {2, 3}. Here, the scaling factor K value may be common (K = 1, 2, 4, or 5, etc.) regardless of the SCS, or may have different values for different SCSs (for example, K = K1 for 480 kHz SCS, K = K2 = K1*2 for 960 kHz SCS, K1 = 1 or 2 or 4 or 5). Alternatively, in this option, the O value for each row index in Table 13 may be replaced or analyzed with one of the values {0, M / K, 5, N / K}.

[0276] - Option 5: {0, 0.25 / K, 0.5 / K, 1 / K}

[0277] When K = 1 and it is 480 kHz SCS, the O value may be specified as 0.25 (or 0.5 or 1) so that CORESET #0 can be transmitted in the slot immediately after transmitting 16 (or 32 or 64) SS / PBCH blocks. Here, the scaling factor K value may be common (such as K = 1, 2, 4, or 5) regardless of the SCS, or may have different values for different SCSs (for example, K = K1 for 480 kHz SCS, K = K2 = K1 * 2 for 960 kHz SCS, K1 = 1 or 2 or 4 or 5). Here, characteristically, the K value may be 1 for 480 kHz SCS and 2 for 960 kHz SCS. Alternatively, in this option, the O value for each row index in Table 13 may be replaced or analyzed with one of the values in {0, 0.25 / K, 0.5 / K, 1 / K}.

[0278] The O value adjusted by the corresponding method may replace the O value on the existing row index as exemplified above, and the adjusted O value may be further signaled with a reserved index.

[0279] FIG. 14 is a diagram illustrating a signaling procedure between a base station and a terminal for a PDCCH transmission / reception method according to an embodiment of the present disclosure.

[0280] In FIG. 14, a signaling procedure between a terminal (UE: user equipment) and a base station (BS: base station) based on the previously proposed method (for example, any one or a combination of Examples 1 and 2 and detailed examples thereof) is illustrated. The illustration in FIG. 14 is for convenience of explanation and does not limit the scope of the present disclosure. Some of the steps illustrated in FIG. 14 may be omitted depending on the situation and / or settings. Also, in FIG. 14, the base station and the terminal are merely one example and may be implemented by the devices illustrated in FIG. 17 below. For example, the processor 102 / 202 in FIG. 17 can be controlled to transmit and receive channels / signals / data / information, etc. using the transceiver 106 / 206, and can also be controlled to store the transmitted or received channels / signals / data / information, etc. in the memory 104 / 204.

[0281] Also, in the operation between the base station and the terminal in FIG. 14, the above-described content may be referred to / used even without specific mention.

[0282] The base station may be a general term for an object that transmits and receives data with the terminal. For example, the base station may be a concept including one or more TPs (Transmission Points), one or more TRPs (Transmission and Reception Points), etc. Also, the TP and / or TRP may include a panel of the base station, a transmission and reception unit, etc. Further, "TRP" may be alternatively applied by expressions such as a panel, an antenna array, a cell (e.g., macro cell / small cell / pico cell, etc.), a TP (transmission point), a base station (base station, gNB, etc.). As described above, the TRP may be classified by information (e.g., index, ID) regarding the CORESET group (or, CORESET pool). As an example, when one terminal is set to transmit and receive with a plurality of TRPs (or, cells), this may mean that a plurality of CORESET groups (or, CORESET pools) are set for one terminal. The setting for such a CORESET group (or, CORESET pool) may be performed by upper layer signaling (e.g., RRC signaling, etc.).

[0283] Referring to FIG. 14, for convenience of explanation, the signaling between one base station and the terminal is considered, but it goes without saying that the signaling method may be extended and applied to the signaling between a plurality of TRPs and a plurality of UEs. In the following description, the base station may be interpreted as one TRP. Or, the base station may include a plurality of TRPs, or may be one cell including a plurality of TRPs.

[0284] Referring to FIG. 14, the terminal receives an SS / PBCH block (or SSB) including PSS, SSS, and PBCH from the base station (S1401). That is, the base station transmits an SS / PBCH block (or SSB) including PSS, SSS, and PBCH to the terminal.

[0285] Here, the MIB may be transmitted to the terminal in the SS / PBCH block (or PBCH within the SS / PBCH block).

[0286] The terminal can check whether there is a CORESET for Type0-PDCCH CSS based on the MIB in the SS / PBCH block (or PBCH within the SS / PBCH block). Type0-PDCCH CSS is a type of PDCCH search space and may be used to transmit PDCCH for scheduling SI messages. When there is a Type0-PDCCH CSS, the terminal can determine (i) a plurality of consecutive RBs and one or more consecutive symbols constituting the CORESET, and / or (ii) a PDCCH opportunity (i.e., a time domain position for PDCCH reception) based on the information in the MIB (e.g., pdcch-ConfigSIB1). For example, specifically, pdcch-ConfigSIB1 is 8-bit information, (i) may be determined based on the 4 most significant bits (MSB), and (ii) may be determined based on the 4 least significant bits (LSB).

[0287] Here, the CSS set set by the MIB and the monitoring opportunity of the PDCCH within the CORESET of the CSS set may be determined. Also, the SS / PBCH block and the CORESET may be multiplexed and transmitted in the time domain.

[0288] The terminal receives a PDCCH from the base station at a PDCCH monitoring occasion determined based on the MIB in the SS / PBCH block (S1402). That is, the base station transmits a PDCCH to the terminal at a PDCCH monitoring occasion determined based on the MIB in the SS / PBCH block.

[0289] Here, i) information for determining the PDCCH monitoring occasion in the MIB (for example, an index in a table defined by the method proposed in the present disclosure, such as Table 14, Table 15, etc.), and ii) the value of the first parameter (i.e., the O value) used to determine the PDCCH monitoring occasion based on the SCS of the SS / PBCH block and the SCS of the PDCCH may be set from among the candidate values of the first parameter. For example, among the plurality of tables (such as Table 14, Table 15, etc.) defined by the method proposed in the present disclosure, it may be determined which table is applicable based on the SCS of the SS / PBCH block and the SCS of the PDCCH. Then, based on the information (such as an index) for determining the PDCCH monitoring occasion set in the MIB, a specific row in the table (such as Table 14, Table 15) defined by the method proposed in the present disclosure may be set for the terminal. And the PDCCH monitoring occasion may be determined based on the parameters of the row. Here, in particular, the first parameter (i.e., the O value) (i.e., the first parameter (i.e., the O value) defined in the table (such as Table 14, Table 15) defined by the method proposed in the present disclosure) may have one value belonging to the row determined by the index set for the terminal from among the candidate values.

[0290] Here, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, candidate values for the first parameter may be defined by the method proposed in the present disclosure.

[0291] Here, according to the previous embodiment, the candidate values (i.e., candidate O values) of the first parameter may be defined such that all or part of {the SCS of the SS / PBCH block, the SCS of the PDCCH} are different from each other depending on whether it is {480, 480} kHz or {960, 960} kHz. For example, all or part of the candidate values (i.e., candidate O values) of the first parameter may be defined to be smaller when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz than when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz. Or, when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz, all or part of the candidate values (i.e., candidate O values) of the first parameter may be defined to be inversely proportional to {the SCS of the SS / PBCH block, the SCS of the PDCCH}. For example, when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}) (e.g., Table 13), for the row indexes 2, 3, and 7 where the O value is 2.5, it may be defined as 1.25 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz and defined as 0.625 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz.

[0292] In other words, depending on whether the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined by applying different scaling factors to the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.5. As another example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.25.

[0293] For example, the scaling factor (e.g., i) K = 0.5 common to 480 / 960 kHz SCS, or ii) K1 = 0.5 for 480 kHz SCS and K2 = 0.25 for 960 kHz SCS) may be applied only when the O value is 2.5 and / or 5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, for row indices 2, 3, 7 where the O value is 2.5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (e.g., Table 13), it may be defined as 1.25 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz (i.e., the scaling factor K1 = 0.5 is applied), and may be defined as 0.625 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz (i.e., the scaling factor K1 = 0.25 is applied).

[0294] Here, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}), the candidate values for the first parameter may correspond to the previous Table 13.

[0295] On the other hand, although not shown in the figure, the {SCS of the SS / PBCH block, SCS of the PDCCH} may be set by upper layer signaling from the base station.

[0296] The terminal can receive / detect DCI via the PDCCH received in the PDCCH monitoring opportunity determined by the method described above. Then, the terminal can receive system information via the PDSCH scheduled by the DCI.

[0297] FIG. 15 is a diagram illustrating the operation of a terminal for a PDCCH transmission / reception method according to an embodiment of the present disclosure.

[0298] In FIG. 15, the operation of the terminal based on the previously proposed method (for example, any one or a combination of Embodiment 1, 2, and detailed embodiments thereof) is illustrated. The illustration in FIG. 15 is for convenience of explanation and does not limit the scope of the present disclosure. Some steps illustrated in FIG. 15 may be omitted depending on the situation and / or settings. Also, in FIG. 15, the terminal is only one example and may be implemented by the device illustrated in FIG. 17 below. For example, the processor 102 / 202 in FIG. 17 can be controlled to transmit / receive channels / signals / data / information, etc. (for example, RRC signaling, MAC CE, DCI for UL / DL scheduling, SRS, PDCCH, PDSCH, PUSCH, PUCCH, etc.) using the transceiver 106 / 206, and can also be controlled to store the transmitted or received channels / signals / data / information, etc. in the memory 104 / 204.

[0299] The terminal receives an SS / PBCH block (or, SSB) including the PSS, SSS, and PBCH from the base station (S1501).

[0300] Here, the MIB may be transmitted to the terminal in the SS / PBCH block (or the PBCH within the SS / PBCH block).

[0301] Based on the MIB within the SS / PBCH block (or the PBCH within the SS / PBCH block), the terminal can check whether there is a CORESET for Type0-PDCCH CSS. Type0-PDCCH CSS is a type of PDCCH search space and may be used to transmit the PDCCH for scheduling SI messages. When there is a Type0-PDCCH CSS, the terminal can determine (i) a plurality of consecutive RBs and one or more consecutive symbols constituting the CORESET, and / or (ii) the PDCCH opportunity (i.e., the time domain position for PDCCH reception) based on the information (e.g., pdcch-ConfigSIB1) within the MIB. For example, specifically, pdcch-ConfigSIB1 is 8-bit information, (i) may be determined based on the 4 MSB (Most Significant Bit) bits, and (ii) may be determined based on the 4 LSB (Least Significant Bit) bits.

[0302] Here, the CSS set set by the MIB and the monitoring opportunity of the PDCCH within the CORESET of the CSS set may be determined. Also, the SS / PBCH block and the CORESET may be transmitted multiplexed in the time domain.

[0303] The terminal receives the PDCCH from the base station at the PDCCH monitoring occasion determined based on the MIB within the SS / PBCH block (S1502).

[0304] Here, i) information for determining PDCCH monitoring opportunities within the MIB (e.g., an index in a table defined by the method proposed in the present disclosure such as Table 14, Table 15, etc.), and ii) based on the SCS of the SS / PBCH block and the SCS of the PDCCH, the value of the first parameter (i.e., O value) used for determining the PDCCH monitoring opportunity may be set from among the candidate values of the first parameter. For example, based on the SCS of the SS / PBCH block and the SCS of the PDCCH, it may be determined which table among a plurality of tables (e.g., Table 14, Table 15, etc.) defined by the method proposed in the present disclosure is applicable. Then, a specific row may be set for the terminal in a table (e.g., Table 14, Table 15) defined by the method proposed in the present disclosure based on the information (e.g., index) for determining the PDCCH monitoring opportunity set within the MIB. And the PDCCH monitoring opportunity may be determined based on the parameters of the row. Here, in particular, the first parameter (i.e., O value) (i.e., the first parameter (i.e., O value) defined in a table (e.g., Table 14, Table 15) defined by the method proposed in the present disclosure) may have one value belonging to the row determined by the index set for the terminal from among the candidate values.

[0305] Here, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, candidate values for the first parameter may be defined by the method proposed in the present disclosure.

[0306] Here, according to the previous embodiment, the candidate values (i.e., candidate O values) of the first parameter may be defined such that all or part of them are different from each other depending on whether the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz and 480 kHz or 960 kHz and 960 kHz. For example, all or part of the candidate values (i.e., candidate O values) of the first parameter may be defined to be smaller when the SCS of the SS / PBCH block and the SCS of the PDCCH are 960 kHz and 960 kHz than when they are 480 kHz and 480 kHz. Alternatively, when the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz or 960 kHz, all or part of the candidate values (i.e., candidate O values) of the first parameter may be defined to be inversely proportional to the SCS of the SS / PBCH block and the SCS of the PDCCH. For example, for the row indices 2, 3, and 7 where the O value is 2.5 when the SCS of the SS / PBCH block and the SCS of the PDCCH are X kHz (X is any one of 15, 30, 60, 120) (e.g., Table 13), it may be defined as 1.25 when the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz and 480 kHz, and defined as 0.625 when the SCS of the SS / PBCH block and the SCS of the PDCCH are 960 kHz and 960 kHz.

[0307] In other words, depending on whether the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined by applying different scaling factors to the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.5. As another example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.25.

[0308] For example, the scaling factor (e.g., i) K = 0.5 common to 480 / 960 kHz SCS, or ii) K1 = 0.5 for 480 kHz SCS and K2 = 0.25 for 960 kHz SCS) may be applied only when the O value is 2.5 and / or 5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, for row indices 2, 3, 7 where the O value is 2.5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (e.g., Table 13), it may be defined as 1.25 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz (i.e., the scaling factor K1 = 0.5 is applied), and may be defined as 0.625 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz (i.e., the scaling factor K1 = 0.25 is applied).

[0309] Here, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}), the candidate values for the first parameter may correspond to the previous Table 13.

[0310] On the other hand, although not shown in the figure, the {SCS of the SS / PBCH block, SCS of the PDCCH} may be set by upper layer signaling by the base station.

[0311] The terminal can receive / detect DCI via the PDCCH received at the PDCCH monitoring opportunity determined by the method described above. Then, the system information can be received via the PDSCH scheduled by the DCI.

[0312] FIG. 16 is a diagram illustrating the operation of a base station for a PDCCH transmission / reception method according to an embodiment of the present disclosure.

[0313] In FIG. 16, the operation of the base station based on the previously proposed method (for example, any one or a combination of Embodiment 1, 2, and detailed embodiments thereof) is illustrated. The illustration in FIG. 16 is for convenience of explanation and does not limit the scope of the present disclosure. Some steps illustrated in FIG. 16 may be omitted depending on the situation and / or settings. Also, the base station in FIG. 16 is only an example and may be implemented by the device illustrated in FIG. 17 below. For example, the processor 102 / 202 in FIG. 17 can be controlled to transmit / receive channels / signals / data / information, etc. (for example, RRC signaling, MAC CE, DCI for UL / DL scheduling, SRS, PDCCH, PDSCH, PUSCH, PUCCH, etc.) using the transceiver 106 / 206, and can also be controlled to store the transmitted or received channels / signals / data / information, etc. in the memory 104 / 204.

[0314] The base station transmits an SS / PBCH block (or, SSB) including the PSS, SSS, and PBCH to the terminal (S1601).

[0315] Here, the MIB may be transmitted to the terminal in the SS / PBCH block (or the PBCH within the SS / PBCH block).

[0316] The base station can configure a CORESET for the Type0-PDCCH CSS based on the MIB in the SS / PBCH block (or the PBCH within the SS / PBCH block). The Type0-PDCCH CSS is a type of PDCCH search space and may be used to transmit the PDCCH that schedules the SI message. Also, the base station can use the information in the MIB (e.g., pdcch-ConfigSIB1) to configure (i) a plurality of consecutive RBs and one or more consecutive symbols that constitute the CORESET, and / or (ii) the PDCCH opportunity (i.e., the time-domain position for PDCCH reception). For example, specifically, pdcch-ConfigSIB1 is 8-bit information, (i) may be determined based on the 4 most significant bits (MSB), and (ii) may be determined based on the 4 least significant bits (LSB).

[0317] Here, the CSS set configured by the MIB and the monitoring opportunity of the PDCCH within the CORESET of the CSS set may be determined. Also, the SS / PBCH block and the CORESET may be multiplexed and transmitted in the time domain.

[0318] The base station transmits the PDCCH to the terminal at the PDCCH monitoring occasion determined based on the MIB in the SS / PBCH block (S1602).

[0319] Here, i) information for determining PDCCH monitoring opportunities within the MIB (e.g., an index in a table defined by the method proposed in the present disclosure such as Table 14, Table 15, etc.), and ii) based on the SCS of the SS / PBCH block and the SCS of the PDCCH, the value of the first parameter (i.e., the O value) used for determining the PDCCH monitoring opportunity may be set from among the candidate values of the first parameter. For example, among a plurality of tables (e.g., Table 14, Table 15, etc.) defined by the method proposed in the present disclosure, which table is applicable may be determined based on the SCS of the SS / PBCH block and the SCS of the PDCCH. Then, a specific row may be set for the terminal in a table (e.g., Table 14, Table 15) defined by the method proposed in the present disclosure based on the information (e.g., index) for determining the PDCCH monitoring opportunity set within the MIB. And the PDCCH monitoring opportunity may be determined based on the parameters of the row. Here, in particular, the first parameter (i.e., the O value) (i.e., the first parameter (i.e., the O value) defined in the table (e.g., Table 14, Table 15) defined by the method proposed in the present disclosure) may have one value belonging to the row determined by the index set for the terminal from among the candidate values.

[0320] Here, when {SS / PBCH block SCS, CORESET index 0 SCS} = {480, 480} kHz or {SS / PBCH block SCS, CORESET index 0 SCS} = {960, 960} kHz, candidate values for the first parameter may be defined by the method proposed in the present disclosure.

[0321] Here, according to the previous embodiments, the candidate values of the first parameter (i.e., candidate O values), in whole or in part, may be defined to be different from each other depending on whether the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz and 480 kHz or 960 kHz and 960 kHz. For example, the candidate values of the first parameter (i.e., candidate O values), in whole or in part, may be defined to be smaller when the SCS of the SS / PBCH block and the SCS of the PDCCH are 960 kHz and 960 kHz than when they are 480 kHz and 480 kHz. Alternatively, when the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz or 960 kHz, the candidate values of the first parameter (i.e., candidate O values), in whole or in part, may be defined to be inversely proportional to the SCS of the SS / PBCH block and the SCS of the PDCCH. For example, for row indices 2, 3, and 7 where the O value is 2.5 when the SCS of the SS / PBCH block and the SCS of the PDCCH are X kHz (X is any one of 15, 30, 60, 120) (e.g., Table 13), it may be defined as 1.25 when the SCS of the SS / PBCH block and the SCS of the PDCCH are 480 kHz and 480 kHz, and defined as 0.625 when the SCS of the SS / PBCH block and the SCS of the PDCCH are 960 kHz and 960 kHz.

[0322] In other words, depending on whether the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz or {960,960} kHz, all or part of the candidate O values may be defined by applying different scaling factors to the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.5. As another example, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz, all or part of the candidate O values may be defined as the values when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz multiplied by 0.25.

[0323] For example, the scaling factor (e.g., i) K = 0.5 common to 480 / 960 kHz SCS, or ii) K1 = 0.5 for 480 kHz SCS and K2 = 0.25 for 960 kHz SCS) may be applied only when the O value is 2.5 and / or 5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (where X is any one of {15, 30, 60, 120}). For example, for row indices 2, 3, and 7 where the O value is 2.5 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X,X} kHz (e.g., Table 13), it may be defined as 1.25 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {480,480} kHz (i.e., the scaling factor K1 = 0.5 is applied), and may be defined as 0.625 when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {960,960} kHz (i.e., the scaling factor K1 = 0.25 is applied).

[0324] Here, when the {SCS of the SS / PBCH block, SCS of the PDCCH} is {X, X} kHz (X is any one of {15, 30, 60, 120}), the candidate values for the first parameter may correspond to Table 13 above.

[0325] On the other hand, although not shown in the figure, the base station can set the {SCS of the SS / PBCH block, SCS of the PDCCH} for the terminal by upper layer signaling.

[0326] The base station can transmit DCI to the terminal via the PDCCH. Also, the PDSCH can be scheduled using the DCI, and system information can be transmitted to the terminal via the PDSCH.

[0327] General Devices Applicable to the Present Disclosure

[0328] FIG. 17 illustrates a block configuration diagram of a wireless communication device according to an embodiment of the present disclosure.

[0329] Referring to FIG. 17, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals using various wireless connection technologies (e.g., LTE, NR).

[0330] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or the transceiver 106, and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. For example, after the processor 102 processes the information in the memory 104 to generate a first information / signal, the processor 102 may transmit a wireless signal including the first information / signal from the transceiver 106. Also, after the processor 102 receives a wireless signal including a second information / signal from the transceiver 106, the processor 102 may store the information obtained from the signal processing of the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and can store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions to perform part or all of the processes controlled by the processor 102 or to execute the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 may be connected to the processor 102 and can transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be alternatively referred to as an RF (Radio Frequency) unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

[0331] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 controls the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. For example, after processing the information in the memory 204 to generate third information / signals, the processor 202 may transmit a wireless signal including the third information / signals from the transceiver 206. Also, after receiving a wireless signal including fourth information / signals from the transceiver 206, the processor 202 may store the information obtained from the signal processing of the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and can store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions to perform part or all of the processes controlled by the processor 202 or to execute the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 206 may be connected to the processor 202 and can transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be alternatively referred to as an RF unit. In the present invention, the wireless device may mean a communication modem / circuit / chip.

[0332] 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 may be implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (for example, functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (Service Data Units) according to the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure. One or more processors 102 and 202 may generate a signal (for example, a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in the present disclosure, and provide it to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (for example, a baseband signal) from one or more transceivers 106 and 206, and obtain a PDU, an SDU, a message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure.

[0333] One or more processors 102, 202 can be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be embodied by hardware, firmware, software, or a combination thereof. As an example, one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices), or one or more FPGAs (Field Programmable Gate Arrays) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure may be embodied using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, and the like. The firmware or software configured to execute the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure may be included in the one or more processors 102, 202, stored in the one or more memories 104, 204, and driven by the one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure may be embodied by firmware or software in the form of code, instruction words, and / or a set of instruction words.

[0334] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and can store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories 104, 204 may be constituted by a ROM, a RAM, an EPROM, a flash memory, a hard drive, a register, a cache memory, a computer-readable storage medium, and / or a combination thereof. The one or more memories 104, 204 may be located inside and / or outside the one or more processors 102, 202. Also, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 by various techniques such as wired or wireless connections.

[0335] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc. mentioned in the methods and / or operation sequence diagrams of the present disclosure to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and one or more transceivers 106, 206 may be configured to transmit and receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in the present disclosure via one or more antennas 108, 208. In the present disclosure, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, wireless signals / channels, etc. processed using one or more processors 102, 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106, 206 can include (analog) oscillators and / or filters.

[0336] The embodiments described above are those in which the components and features of the present disclosure are combined in a predetermined form. Each component or feature should be considered as optional unless specifically mentioned. Each component or feature may be implemented in a form that does not combine with other components or features. Also, it is possible to combine some components and / or features to constitute embodiments of the present disclosure. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in other embodiments, or may be replaced with corresponding components or features of other embodiments. It is obvious that claims without an explicit citation relationship in the claims can be combined to constitute embodiments, or can be included as new claims by amendment after filing.

[0337] It is obvious to those skilled in the art that the present disclosure can be embodied in other specific forms without departing from the essential features of the present disclosure. Therefore, the above detailed description should not be construed as restrictive in any way and should be considered exemplary. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and any modifications within the equivalent scope of the present disclosure are included in the scope of the present disclosure.

[0338] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that cause the operations of the methods of various embodiments to be executed on a device or computer, and non-transitory computer-readable media on which such software or instructions are stored and executable on a device or computer. Instructions available for programming a processing system to execute the features described in the present disclosure may be stored on or in a storage medium or computer-readable storage medium, and the features described in the present disclosure may be implemented using a computer program product including such a storage medium. The storage medium can include, but is not limited to, high-speed random access memory such as DRAM, SRAM, DDR RAM, or other random access solid-state memory devices, and can include non-volatile memory such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory can optionally include one or more storage devices located remotely from the processor. The memory or alternatively the non-volatile memory device within the memory includes a non-transitory computer-readable storage medium. The features described in the present disclosure may be stored on any one of the machine-readable media, control the hardware of the processing system, and be integrated with software and / or firmware that enables the processing system to interact with other mechanisms that utilize the results according to the embodiments of the present disclosure. Such software or firmware can include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0339] Here, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure can include Narrowband Internet of Things (NB-IoT) for low-power communication in addition to LTE, NR, and 6G. At this time, for example, the NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices (XXX, YYY) of the present disclosure can communicate based on LTE-M technology. At this time, as an example, the LTE-M technology may be an example of LPWAN technology and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, the LTE-M technology may be implemented by at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices (XXX, YYY) of the present disclosure can include at least any one of ZigBee (registered trademark), Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-mentioned names. As an example, the ZigBee technology can generate PAN (personal area networks) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and may be called by various names.

Industrial Applicability

[0340] Although the method proposed in this disclosure has been mainly described with examples applicable to 3GPP LTE / LTE-A and 5G systems, it is applicable to various wireless communication systems in addition to 3GPP LTE / LTE-A and 5G systems.

Claims

The step in which a terminal receives an SS / PBCH (synchronization signal / physical broadcast channel) block including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel); The step in which the terminal receives a PDCCH (physical downlink control channel) at a PDCCH monitoring opportunity determined based on an MIB (master information block) within the SS / PBCH block; and the method includes: Based on {the SCS (subcarrier spacing) of the SS / PBCH block, the SCS of the PDCCH}, the value of a first parameter for the PDCCH monitoring opportunity is determined; The value of the first parameter is compared with the value of the first parameter defined as 2.5 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {120, 120} kHz; When {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz, it is defined as 1.25; When {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz, it is defined as 0.

625.

2. Some candidate values of the first parameter are defined to be smaller when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz than when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz. The method according to claim 1.

3. Based on {the SCS of the SS / PBCH block, the SCS of the PDCCH} being {480, 480} kHz or {960, 960} kHz, some candidate values of the first parameter are defined to be inversely proportional to {the SCS of the SS / PBCH block, the SCS of the PDCCH}. The method according to claim 1 or 2.

4. Depending on whether {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz or {960, 960} kHz, some candidate values of the first parameter are defined by applying different scaling factors to the corresponding values when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {X, X} kHz (X is one of {15, 30, 60, 120}), the method according to claim 1 or 2.

5. Based on {the SCS of the SS / PBCH block, the SCS of the PDCCH} being {480, 480} kHz, the scaling factor is 0.5, the method according to claim 4.

6. Based on {the SCS of the SS / PBCH block, the SCS of the PDCCH} being {960, 960} kHz, the scaling factor is 0.25, the method according to claim 4.

7. The monitoring opportunity of the PDCCH is determined within the CSS (common search space) set set by the MIB and the CORESET (control resource set) of the CSS set, the method according to claim 1 or 2.

8. The SS / PBCH block and the CORESET are multiplexed and transmitted in the time domain, the method according to claim 7.

9. At least one transceiver for transmitting and receiving radio signals, At least one processor for controlling the at least one transceiver, The at least one processor is Receiving an SS / PBCH (synchronization signal / physical broadcast channel) block including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel), Configured to receive a PDCCH (physical downlink control channel) at a PDCCH monitoring opportunity determined based on the MIB (master information block) in the SS / PBCH block, Based on {the subcarrier spacing (SCS) of the SS / PBCH block, the SCS of the PDCCH}, the value of a first parameter for the PDCCH monitoring occasion is determined. For the value of the first parameter defined as 2.5 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {120, 120} kHz, the value of the first parameter is defined as 1.25 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz, and is defined as 0.625 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz, a terminal. **Claim 10**: A base station transmitting an SS / PBCH (synchronization signal / physical broadcast channel) block including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel); the base station transmitting a PDCCH (physical downlink control channel) in a PDCCH monitoring occasion determined based on an MIB (master information block) in the SS / PBCH block. Based on {the subcarrier spacing (SCS) of the SS / PBCH block, the SCS of the PDCCH}, the value of a first parameter for the PDCCH monitoring occasion is determined. For the value of the first parameter defined as 2.5 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {120, 120} kHz, the value of the first parameter is defined as 1.25 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {480, 480} kHz, and is defined as 0.625 when {the SCS of the SS / PBCH block, the SCS of the PDCCH} is {960, 960} kHz, a method. **Claim 11**: At least one transceiver for transmitting and receiving radio signals; At least one processor for controlling the at least one transceiver, The at least one processor is configured to: Transmit a synchronization signal / physical broadcast channel (SS / PBCH) block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); Transmit a physical downlink control channel (PDCCH) at a PDCCH monitoring opportunity determined based on a master information block (MIB) within the SS / PBCH block; Based on {subcarrier spacing (SCS) of the SS / PBCH block, SCS of the PDCCH}, a value of a first parameter for the PDCCH monitoring opportunity is determined; The value of the first parameter is relative to a value of the first parameter defined as 2.5 when {SCS of the SS / PBCH block, SCS of the PDCCH} is {120, 120} kHz; Is defined as 1.25 when {SCS of the SS / PBCH block, SCS of the PDCCH} is {480, 480} kHz; A base station, which is defined as 0.625 when {SCS of the SS / PBCH block, SCS of the PDCCH} is {960, 960} kHz.

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