Method and device for utilizing on-demand synchronization signal block in wireless communication system

Abstract

Disclosed are a method and a device for reporting channel state information in a wireless communication system. The method performed by a terminal according to an embodiment of the present disclosure may include the steps of: receiving, from a base station, first configuration information related to a plurality of first time intervals for measuring an on-demand synchronization signal block (SSB); performing measurement on at least one SSB within at least one first time interval among the plurality of first time intervals; and transmitting, to the base station, a measurement result for the at least one SSB, wherein each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, and the reference time point is i) an on-demand SSB transmission request time point or ii) a reception time point of control information related to the on-demand SSB.

Description

Method and device for utilizing an on-demand synchronization signal block in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for utilizing an on-demand synchronization signal block (SSB) in a wireless communication system.

[0002] Mobile communication systems were developed to provide voice services while ensuring user activity. However, they have expanded beyond voice to include data services. Currently, explosive growth in traffic is leading to resource shortages and users' demand for higher-speed services, necessitating a more advanced mobile communication system.

[0003] Next-generation mobile communication systems must support explosive data traffic growth, dramatically increasing data rates per user, a vastly increased number of connected devices, ultra-low end-to-end latency, and high energy efficiency. To achieve these goals, various technologies are being studied, including dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] The technical problem of the present disclosure is to provide a method and device for utilizing an on-demand synchronization signal block (SSB) in a wireless communication system.

[0005] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0006] A method performed by a terminal according to one aspect of the present disclosure comprises: receiving, from a base station, first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurement; performing measurement for at least one SSB within at least one first time interval among the plurality of first time intervals; and transmitting a result of the measurement for the at least one SSB to the base station, wherein each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, and the reference time point may be i) a time point of requesting on-demand SSB transmission or ii) a time point of receiving control information related to the on-demand SSB.

[0007] A method performed by a base station according to an additional aspect of the present disclosure comprises: transmitting, to a terminal, first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurement; transmitting at least one on-demand SSB to the terminal; and receiving, from the terminal, a result of measurement for the at least one on-demand SSB, wherein a measurement operation for the at least one on-demand SSB is performed within at least one first time interval among the plurality of first time intervals, each of the at least one first time interval being a time interval after a reference time interval from a reference time point among the plurality of first time intervals, wherein the reference time point may be i) a time point at which an on-demand SSB transmission request is made or ii) a time point at which control information related to the on-demand SSB is received.

[0008] According to various embodiments of the present disclosure, a method and apparatus for utilizing an on-demand synchronization signal block (SSB) in a wireless communication system can be provided.

[0009] According to various embodiments of the present disclosure, there is a technical effect that can support energy saving of a base station due to on-demand SSB transmission by enabling a terminal to connect and receive an additional reference signal (RS) when measuring on-demand SSB.

[0010] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0011] The accompanying drawings, which are incorporated in and are part of the detailed description to aid in understanding the present disclosure, provide embodiments of the present disclosure and, together with the detailed description, describe the technical features of the present disclosure.

[0012] Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0013] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0014] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

[0015] FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.

[0016] FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

[0017] FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the same.

[0018] FIG. 7 illustrates an SSB transmission method of a base station operating multiple frequency bands that can be applied to the present disclosure.

[0019] Figure 8 illustrates an on-demand SSB related procedure applicable to the present disclosure.

[0020] FIG. 9 is a diagram for explaining the operation of a terminal according to one embodiment of the present disclosure.

[0021] FIG. 10 is a diagram for explaining the operation of a base station according to one embodiment of the present disclosure.

[0022] FIG. 11 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.

[0023] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below, together with the accompanying drawings, is intended to explain exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the present disclosure may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present disclosure. However, one of ordinary skill in the art will appreciate that the present disclosure may be practiced without these specific details.

[0024] In some cases, to avoid obscuring the concepts of the present disclosure, known structures and devices may be omitted or illustrated in block diagram form focusing on the core functions of each structure and device.

[0025] In the present disclosure, when a component is said to be "connected," "coupled," or "connected" to another component, this may include not only a direct connection but also an indirect connection in which another component exists between them. Furthermore, the terms "comprises" or "has" in the present disclosure specify the presence of the mentioned features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0026] In this disclosure, terms such as “first,” “second,” etc. are used only to distinguish one component from another and are not used to limit the components, and do not limit the order or importance between the components unless specifically stated otherwise. Accordingly, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0027] The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the scope of the claims. As used in the description of the embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. The term "and / or" as used herein may refer to any one of the associated enumerated items, or is meant to refer to and encompass any and all possible combinations of two or more of them. Furthermore, the use of " / " between words in this disclosure has the same meaning as "and / or" unless otherwise stated.

[0028] The present disclosure describes a wireless communication network or a wireless communication system, and operations performed in the wireless communication network may be performed in a process of controlling the network and transmitting or receiving a signal from a device (e.g., a base station) that manages the wireless communication network, or in a process of transmitting or receiving a signal to or between terminals connected to the wireless network.

[0029] In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal through the channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

[0030] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of a base station. A base station may be expressed as a first communication device, and a terminal may be expressed as a second communication device. A base station (BS) may be replaced by terms such as a 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.In addition, the terminal may be fixed or mobile, and may be replaced with 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, UAV (Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0031] The technology described in this specification can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), and 5G NR.

[0032] The technology described in this specification can be implemented with 6G wireless technology and applied to various 6G systems. For example, the 6G system can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine-type communication (mMTC), artificial intelligence (AI) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0033] For clarity, the description is based on 3GPP communication systems (e.g., LTE-A, NR, 6G), but the technical spirit of the present disclosure is not limited thereto. LTE refers to technology after 3GPP TS (Technical Specification) 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR / 6G may be referred to as a 3GPP system. “xxx” refers to a standard document detail number. LTE / NR / 6G may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present disclosure, reference may be made to matters described in standard documents published prior to the present disclosure. For example, reference may be made to the following documents.

[0034] For 3GPP LTE, see 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), and TS 36.331 (Radio resource control).

[0035] For 3GPP NR, see 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 (Overall description of NR and New Generation-Radio Access Network (NG-RAN)), and TS 38.331 (Radio Resource Control Protocol Specification).

[0036] Abbreviations for terms that may be used in this disclosure are defined as follows.

[0037] - BM: beam management

[0038] - CQI: Channel Quality Indicator

[0039] - CRI: Channel state information - reference signal resource indicator

[0040] - CSI: Channel State Information

[0041] - CSI-IM: Channel State Information - Interference Measurement

[0042] - CSI-RS: Channel state information - reference signal

[0043] - DMRS: Demodulation Reference Signal

[0044] - FDM: frequency division multiplexing

[0045] - FFT: fast Fourier transform

[0046] - IFDMA: interleaved frequency division multiple access

[0047] - IFFT: inverse fast Fourier transform

[0048] - L1-RSRP: Layer 1 reference signal received power

[0049] - L1-RSRQ: Layer 1 reference signal received quality

[0050] - MAC: Medium Access Control

[0051] - NZP: non-zero power

[0052] - OFDM: orthogonal frequency division multiplexing

[0053] - PDCCH: Physical downlink control channel

[0054] - PDSCH: Physical downlink shared channel

[0055] - PMI: precoding matrix indicator

[0056] - RE: resource element

[0057] - RI: Rank indicator

[0058] - RRC: Radio Resource Control

[0059] - RSSI: Received signal strength indicator

[0060] - Rx: Reception

[0061] - QCL: quasi co-location

[0062] - SINR: signal to interference and noise ratio

[0063] - SSB (or SS / PBCH block): Synchronization signal block (including primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH))

[0064] - TDM: Time Division Multiplexing

[0065] - TRP: transmission and reception point

[0066] - TRS: Tracking Reference Signal

[0067] - Tx: transmission

[0068] - UE: user equipment

[0069] - ZP: Zero Power

[0070] System General

[0071] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing radio access technologies (RATs) is emerging. Furthermore, massive machine type communications (MTC), which connects numerous devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs that consider enhanced mobile broadband communication (eMBB), massive MTC (MMTC), and ultra-reliable and low latency communication (URLLC) is being discussed. For convenience, these technologies are referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0072] As mentioned above, the NR system, a successor to LTE (long term evolution), is a new clean-slate mobile communications system characterized by high performance, low latency, and high availability. NR systems can utilize all available spectrum resources, from low-frequency bands below 1 GHz, to intermediate-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz. Based on the underlying technology of the NR system, the 6G mobile communications system (hereinafter referred to as the 6G system) is being developed.

[0073] The 6G system aims to provide (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) low energy consumption for battery-free Internet of Things (IoT) devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be divided into four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity.

[0074] New RAT systems, including NR systems and 6G systems (hereinafter referred to as "next-generation RAT systems"), utilize OFDM transmission schemes or similar transmission schemes. Next-generation RAT systems may follow OFDM parameters different from those of LTE. Alternatively, next-generation RAT systems may follow the existing LTE / LTE-A numerology but support a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell may support multiple numerologies. That is, terminals operating under different numerologies may coexist within a single cell.

[0075] A numerology corresponds to a single subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.

[0076] Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0077] Referring to Fig. 1, the NG-RAN consists of gNBs that provide NG-RA (NG-Radio Access) user plane (i.e., new AS (access stratum) sublayer / PDCP (packet data convergence protocol) / RLC (radio link control) / MAC / PHY) and control plane (RRC) protocol termination for UE. The gNBs are interconnected via Xn interfaces. 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.

[0078] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0079] Next-generation RAT systems can support multiple numerologies. Numerologies can be defined by subcarrier spacing and cyclic prefix (CP) overhead. Multiple subcarrier spacings can be derived by scaling the base (reference) subcarrier spacing by an integer N (or μ). Furthermore, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the numerology used can be selected independently of the frequency band. Furthermore, next-generation RAT systems can support various frame structures corresponding to multiple numerologies.

[0080] Below, we examine OFDM numerologies and frame structures that can be considered in next-generation RAT systems. The various OFDM numerologies supported in next-generation RAT systems can be defined as shown in Table 1 below.

[0081] μΔf=2 μ ·15 [kHz]CP015 Normal 130 Normal 260 Normal, Extended 3120 Normal 4240 Normal

[0082] Next-generation RAT systems support multiple numerologies (or subcarrier spacings (SCS)) to support various 5G / 6G 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, lower latency, and wider carrier bandwidth; and when the SCS is 60 kHz or higher, it supports a bandwidth larger than 24.25 GHz to overcome phase noise. Although not described in Table 1, 6G systems may additionally support an SCS of 480 kHz / 960 kHz. The frequency bands of next-generation RAT systems are defined by various types of frequency ranges (e.g., FR1, FR2, etc.). For example, FR1, FR2 are It can be configured as shown in Table 2 below. In addition, FR2 can mean millimeter wave (mmW).

[0083] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing FR1410MHz - 7125MHz 15, 30, 60kHz FR224250MHz - 52600MHz 60, 120, 240kHz

[0084] Regarding the frame structure in the next-generation RAT system, the sizes of various fields in the time domain are T c =1 / (Δf max ·N f ) is expressed as a multiple of the time unit. Here, Δf max =480·10 3 Hz, and N f =4096. Downlink and uplink transmissions are T f =1 / (Δf max N f / 100)·T c = It is organized into radio frames with a duration of 10ms. Here, each radio frame is T sf =(Δf max N f / 1000)·T c = It consists of 10 subframes with a duration of 1ms. In this case, there may be one set of frames for uplink and one set of frames for downlink. In addition, transmission in uplink frame number i from a terminal is T earlier than the start of the corresponding downlink frame from the terminal. TA =(N TA +N TA,offset )T c It should start before. For the subcarrier spacing configuration μ, slots are n within a subframe. s μ ∈{0,..., N slotsubframe,μ-1} are numbered in increasing order, and n within a radio frame. s,f μ ∈{0,..., N slot frame,μ -1} are numbered in increasing order. One slot is N symb slot It consists of consecutive OFDM symbols, and N symb slot is determined by CP. Slot n in subframe s μ The start of OFDM symbol n in the same subframe s μ N symb slot are aligned temporally with the start of the OFDM signal. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in a downlink slot or uplink slot can be utilized.

[0085] Table 3 shows the number of OFDM symbols per slot in a general CP (N symb slot ), the number of slots per wireless frame (N slot frame,μ ), number of slots per subframe (N slot subframe,μ), and Table 4 shows the number of OFDM symbols per slot in the extended CP, the number of slots per radio frame, and the number of slots per subframe.

[0086] μN symb slot N slot frame,μ N slot subframe,μ01410111420221440431480841416016

[0087] μN symb slot N slot frame,μ N slot subframe,μ212404

[0088] FIG. 2 is an example when μ=2 (SCS is 60 kHz), and referring to Table 3, 1 subframe can include 4 slots. 1 subframe={1,2,4} slots illustrated in FIG. 2 is an example, and the number of slot(s) that can be included in 1 subframe is defined as in Table 3 or Table 4. In addition, a mini-slot can include 2, 4, or 7 symbols, or more or fewer symbols. With respect to physical resources in the next-generation RAT system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. Hereinafter, the physical resources that can be considered in the next-generation RAT system will be described in detail.

[0089] First, with respect to antenna ports, antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be in a QC / QCL (quasi co-located or quasi co-location) relationship if the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on another antenna port is carried. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0090] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

[0091] Referring to Figure 3, the resource grid is N in the frequency domain. RB μ N sc RB It consists of subcarriers, and one subframe is 14·2 μ It is described as an example, but not limited to, that it consists of OFDM symbols. In the next-generation RAT system, the transmitted signal is N RB μ N sc RB One or more resource grids consisting of subcarriers and 2 μ N symb (μ) is described by OFDM symbols. Here, N RB μ ≤N RB max,μ is. The above N RB max,μ represents the maximum transmission bandwidth, which may vary between uplink and downlink as well as between numerologies. In this case, one resource grid may be configured for μ and each antenna port p. Each element of the resource grid for μ and each antenna port p is referred to as a resource element and is uniquely identified by an index pair (k, l'). Here, k=0,...,N RB μ N sc RB -1 is the index in the frequency domain, and l'=0,...,2 μ N symb (μ) -1 indicates the position of the symbol within the subframe. When referring to a resource element in a slot, an index pair (k,l) is used. Here, l=0,...,N symb μ-1. The resource element (k,l') for μ and antenna port p is a complex value a k,l' (p,μ) . If there is no risk of confusion or if a particular antenna port or numerology is not specified, the indices p and μ can be dropped, resulting in a complex value of a k,l' (p) or a k,l' This can be. Also, a resource block (RB) is N in the frequency domain. sc RB =12 is defined as consecutive subcarriers.

[0092] Point A serves as a common reference point of the resource block grid and is obtained as follows.

[0093] - offsetToPointA for the Primary Cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping the SS / PBCH block used by the UE for initial cell selection. It is expressed in resource block units assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2.

[0094] - absoluteFrequencyPointA represents the frequency-position of point A expressed as ARFCN (absolute radio-frequency channel number).

[0095] Common resource blocks (CRBs) are numbered from 0 upwards in the frequency domain for a subcarrier spacing setting μ. The center of subcarrier 0 of CRB 0 for a subcarrier spacing setting μ coincides with 'point A'. Common resource block number n in the frequency domain CRB μ The relationship between the resource elements (k, l) and the subcarrier spacing setting μ is given by the following mathematical expression 1.

[0096]

[0097] In Equation 1, k is defined relative to point A such that k = 0 corresponds to the subcarrier centered at point A. Physical resource blocks are numbered from 0 to N within the bandwidth part (BWP). BWP,i size,μ -Numbered from -1, where i is the number of BWP. Physical resource block n in BWP i PRB and common resource block n CRB The relationship between them is given by the mathematical formula 2 below.

[0098]

[0099] N BWP,i start,μ is a common resource block where BWP starts relative to common resource block 0.

[0100] FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied. FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

[0101] Referring to FIGS. 4 and 5, a slot includes multiple symbols in the time domain. For example, in the case of a normal CP, one slot includes seven symbols, but in the case of an extended CP, one slot includes six symbols.

[0102] A carrier comprises multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) is defined as multiple consecutive (physical) resource blocks in the frequency domain, and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can comprise up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0103] Next-generation RAT systems can support up to 400 MHz per component carrier (CC). If a terminal operating on 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, when considering multiple use cases operating within a single wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing, etc.) may be supported for each frequency band within the CC. Alternatively, each terminal may have different maximum bandwidth capabilities. Considering this, the base station can instruct the terminal to operate only in a portion of the bandwidth of the wideband CC, rather than the entire bandwidth. This portion of bandwidth is conveniently defined as the bandwidth part (BWP). A BWP can be composed of consecutive RBs on the frequency axis and can correspond to a single numerology (e.g., subcarrier spacing, CP length, slot / mini-slot interval).

[0104] Meanwhile, a base station can configure multiple BWPs even within a single CC configured for a terminal. For example, a BWP occupying a relatively small frequency domain can be configured in a PDCCH monitoring slot, while the PDSCH indicated by the PDCCH can be scheduled on a larger BWP.

[0105] Alternatively, if UEs are concentrated in a specific BWP, some UEs can be assigned to different BWPs for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, some spectrum in the middle of the total bandwidth can be excluded and both BWPs can be assigned within the same slot. In other words, the base station can assign at least one DL / UL BWP to UEs associated with a wideband CC.

[0106] The base station can activate at least one DL / UL BWP among the DL / UL BWP(s) configured at a specific point in time (by L1 signaling or MAC CE (Control Element) or RRC signaling, etc.). In addition, the base station can instruct switching to another configured DL / UL BWP (by L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, switching to a designated DL / UL BWP may be performed when a timer value expires based on a timer. In this case, the activated DL / UL BWP is defined as an active DL / UL BWP. However, since the UE may not receive the configuration for the DL / UL BWP when performing the initial access process or before the RRC connection is set up, the DL / UL BWP assumed by the UE in such a situation is defined as the initially active DL / UL BWP.

[0107] FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the same.

[0108] In wireless communication systems, terminals receive information from a base station via the downlink and transmit it to the base station via the uplink. The information transmitted and received between the base station and terminals includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0109] The second node of FIG. 6 supports dynamic spectrum sharing (DSS), which can provide connectivity not only to nodes implementing 6G technology but also to nodes implementing pre-6G wireless communication technologies (e.g., 5G, 4G). That is, the first node of FIG. 6 can implement either 6G technology or pre-6G wireless communication technologies (e.g., 5G, 4G). Furthermore, the first node and / or the second node can support full duplex mode as well as non-overlapping full duplex mode.

[0110] In Fig. 6, for the sake of simplicity of explanation, the first node and the second node are assumed to be a terminal and a base station, respectively, and operations of transmitting and / or receiving data by the terminal (110) and the base station (120) and operations performed prior thereto are illustrated. However, the operations of Fig. 6 are not limited to operations between the terminal and the base station, and may be interpreted as operations between the first node and the second node. In addition, although Fig. 6 illustrates direct wireless signal transmission and reception operations between the terminal (110) and the base station (120), one or more intermediate points may exist between the terminal (110) and the base station (120), and wireless signals may be transmitted and received via one or more intermediate points.

[0111] Referring to FIG. 6, in step 101, the terminal (110) and the base station (120) perform synchronization. For example, the terminal (110) performs an initial cell search operation. Specifically, the terminal (110) can detect a synchronization signal for connection to at least one base station transmitted from the base station (120) according to a predefined rule. Here, the synchronization signal can include a plurality of synchronization signals classified according to structure or purpose (e.g., a first synchronization signal (e.g., a primary synchronization signal), a second synchronization signal (e.g., a secondary synchronization signal), etc.). Through this, the terminal (110) can confirm the boundary of a unit (e.g., a frame, a subframe, a slot, and / or a symbol) constituting a wireless signal transmission of the base station (120) and obtain information (e.g., a cell identifier) ​​about the base station (120).

[0112] In step 103, the terminal (110) obtains system information transmitted from the base station (120). The system information is information related to the properties, characteristics, and / or capabilities of the base station (120) required to access the base station (120) and use the service, and may be classified according to the content (e.g., whether it is essential for access), transmission structure (e.g., channel used, whether provided on-demand), etc., and may be classified into, for example, first system information (e.g., master information block (MIB), primary system information), second system information (e.g., system information block (SIB), secondary system information), etc. If necessary, the terminal (110) may transmit a signal requesting system information before receiving the system information. However, the request and provision of the system information may be performed after the random access procedure described below.

[0113] In step 105, the terminal (110) and the base station (120) perform a random access procedure. The terminal (110) may transmit and / or receive at least one message (e.g., a random access preamble, a random access response (RAR) message, etc.) for the random access procedure based on information related to a channel for the random access procedure of the base station (120) obtained through system information (e.g., a channel position, a channel structure, a structure of a supported preamble, etc.). For example, the terminal (110) may transmit a first message (e.g., a preamble, MSG1) through the channel for the random access procedure, receive a second message (e.g., an RAR message, MSG2), transmit a third message (e.g., MSG3) including information related to the terminal (110) (e.g., identification information) to the base station (120) using scheduling information included in the second message, and receive a fourth message (e.g., MSG4) for contention resolution and / or connection establishment. As another example, the first and third messages may be sent and received as one message, or the second and fourth messages may be sent and received as one message.

[0114] In step 107, the terminal (110) and the base station (120) perform signaling of control information. Here, the control information may be defined in various layers, such as a layer that controls a connection (e.g., a radio resource control (RRC) layer), a layer that handles mapping between logical channels and transport channels (e.g., a media access control (MAC) layer), and a layer that handles physical channels (e.g., a physical (PHY) layer). For example, the terminal (110) and the base station (120) may perform at least one of signaling for establishing a connection, signaling for determining settings related to communication, and signaling for indicating allocated resources.

[0115] In step 109, the terminal (110) and the base station (120) transmit and / or receive data. In other words, the terminal (110) and the base station (120) can process, transmit, and / or receive data based on the signaling of the control information. For example, when transmitting data, the terminal (110) or the base station (120) can perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on the information bits. Conversely, when receiving data, the terminal (110) or the base station (120) can perform at least one of signal extraction from resources, waveform demodulation for each antenna, signal arrangement considering layer mapping, constellation demapping, descrambling, and channel decoding.

[0116] Table 5 shows an example of DCI format in the next-generation RAT system.

[0117] DCI Format Utilization 0_0 Scheduling of PUSCH within a cell 0_1 Scheduling of one or multiple PUSCH within a cell, or indicating cell group (CG: cell group) downlink feedback information to the UE 0_2 Scheduling of PUSCH within a cell 1_0 Scheduling of PDSCH within a DL cell 1_1 Scheduling of PDSCH within a cell 1_2 Scheduling of PDSCH within a cell

[0118] Referring to Table 5, DCI formats 0_0, 0_1, and 0_2 may include resource information related to scheduling of PUSCH (e.g., UL / SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block (TB) related information (e.g., MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid - Automatic Repeat and request) related information (e.g., process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information (e.g., PUSCH power control, etc.), and the control information included in each DCI format may be predefined. DCI format 0_0 is used for scheduling of PUSCH in one cell. Information included in DCI format 0_0 is transmitted after being CRC (cyclic redundancy check) scrambled by C-RNTI (cell radio network temporary identifier, Cell RNTI), CS-RNTI (Configured Scheduling RNTI), or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI). DCI format 0_1 ​​is used to indicate scheduling of one or more PUSCHs in one cell, or configured grant (CG) downlink feedback information to a UE. Information included in DCI format 0_1 ​​is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI (Semi-Persistent CSI RNTI), or MCS-C-RNTI.DCI format 0_2 is used for scheduling PUSCH in a cell. The information contained in DCI format 0_2 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI. Next, DCI formats 1_0, 1_1, and 1_2 may include resource information related to scheduling of PDSCH (e.g., frequency resource allocation, time resource allocation, virtual resource block (VRB)-physical resource block (PRB) mapping, etc.), transport block (TB) related information (e.g., MCS, NDI, RV, etc.), HARQ related information (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., antenna port, transmission configuration indicator (TCI), sounding reference signal (SRS) request, etc.), PUCCH related information (e.g., PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format may be predefined.

[0119] DCI format 1_0 is used for scheduling PDSCH in a DL cell. The information contained in DCI format 1_0 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0120] DCI format 1_1 is used for scheduling PDSCH in a single cell. The information contained in DCI format 1_1 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0121] DCI format 1_2 is used for scheduling PDSCH in a single cell. The information contained in DCI format 1_2 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0122] Quasi-Co Location (QCL)

[0123] Antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be in a QC / QCL (quasi co-located or quasi co-location) relationship if the properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on another antenna port is carried.

[0124] Here, the channel characteristics include one or more of delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay, and spatial Rx parameter. Here, the spatial Rx parameter refers to a spatial (reception) channel characteristic parameter such as angle of arrival.

[0125] A terminal may be configured with a list of up to M TCI-State settings in the upper layer parameter PDSCH-Config to decode PDSCHs based on detected PDCCHs having DCI intended for the terminal and a given serving cell. M depends on the UE capability.

[0126] Each TCI-State contains parameters for establishing a quasi co-location relationship between one or two DL reference signals and the DM-RS port of the PDSCH.

[0127] The quasi-colocation relationship is established by the upper-layer parameters qcl-Type1 for the first DL RS and qcl-Type2 (if set) for the second DL RS. For two DL RSs, the QCL types are not the same, regardless of whether the references are the same DL RS or different DL RSs.

[0128] The quasi co-location type corresponding to each DL RS is given by the higher layer parameter qcl-Type of QCL-Info, and can take one of the following values:

[0129] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0130] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0131] - 'QCL-TypeC': {Doppler shift, average delay}

[0132] - 'QCL-TypeD': {Spatial Rx parameter}

[0133] For example, if a target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port(s) can be instructed / configured to be QCL with a specific TRS from a QCL-Type A perspective and with a specific SSB from a QCL-Type D perspective. A terminal that has received such an instruction / configuration can receive the corresponding NZP CSI-RS using the Doppler and delay values ​​measured at the QCL-TypeA TRS, and apply the reception beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception.

[0134] The UE can receive an activation command by MAC CE signaling, which is used to map up to eight TCI states to codepoints in the DCI field 'Transmission Configuration Indication'.

[0135] CSI framework

[0136] In relation to setting and reporting of channel state information (CSI), at least one of the following CSI frameworks may be applied.

[0137] (CSI Framework Method 1) Multiple CSI-RS resource sets are linked for one channel measurement resource (CMR) (e.g., a resource configurable by the resourcesForChannelMeasurement parameter) or one interference measurement resource (IMR) (e.g., a resource configurable by the csi-IM-ResourcesForInterference parameter or the nzp-CSI-RS-ResourcesForInterference parameter) within a CSI reporting configuration (e.g., CSI-ReportConfig). For example, CSI-RS resource set #1 and CSI-RS resource set #2 may be linked for CMR, and CSI-RS resources belonging to CSI-RS resource set #1 may be configured with 16 antenna ports (APs), and CSI-RS resources belonging to CSI-RS resource set 2 may be configured with 8 antenna ports (APs).

[0138] (CSI Framework Method 2) When there is one CSI-RS resource set linked to one CMR or one IMR within a CSI reporting configuration, the CSI-RS resource set is configured with one or more CSI-RS resources having different properties such as the number of APs and / or power offset. For example, for CSI-RS resource set #1 configured as CMR, CSI-RS resource #1 belonging to CSI-RS resource set #1 may be configured with 16 antenna ports (APs) (or power offset #1 value may be set), and CSI-RS resource #2 belonging to the same CSI resource set may be configured with 8 antenna ports (APs) (or power offset #2 value may be set).

[0139] (CSI Framework Method 3) When there is a CSI-RS resource set linked to a CMR or an IMR within the CSI reporting configuration, some or all of the CSI-RS resource(s) within the CSI-RS resource set may be configured with multiple AP numbers and / or power offsets. For example, for CSI-RS resource set #1 configured with CMR, CSI-RS resource #1 belonging to CSI-RS resource set #1 may be configured with a maximum of 16 antenna ports (APs), and CSI reporting utilizing some of the AP(s) may be configured, or CSI-RS resource #2 belonging to the same CSI-RS resource set may be configured with multiple power offset values, and CSI reporting utilizing all or part of the power offsets may be configured.

[0140] Under the CSI framework described above, a CSI reporting method can be defined through at least one of the following options.

[0141] (Option 1) CSIs considering multiple AP counts and / or multiple power offset values ​​set in a single CSI report may all be included in a single CSI report. Alternatively, CSIs considering multiple AP counts and / or multiple power offsets may be included in a single CSI report through configuration / instruction of the base station (wherein the AP counts and / or power offsets set / instructed by the base station may be part of the AP counts and / or power offset values ​​set in the corresponding CSI report).

[0142] (Option 2) Even if multiple AP counts and / or multiple power offset values ​​are set in one CSI report, CSIs considering a single AP count and / or a single power offset can be included in one CSI report through the configuration / instruction of the base station.

[0143] (Option 3) Even if multiple AP counts and / or multiple power offset values ​​are set in one CSI report, CSIs considering some AP counts and / or some power offsets may be included in one CSI report through the terminal's judgment / decision (using criteria set in advance by the base station or pre-defined).

[0144] L(>1) sub-configurations can be configured within a CSI-ReportConfig, and each sub-configuration can correspond to one spatial or power domain adaptation pattern.

[0145] Here, the spatial domain adaptation pattern may correspond to a specific number of antenna ports (or antenna port on / off pattern), or may correspond to a specific CSI-RS power value (e.g., a CSI-RS power value determined by the powerControlOffsetSS parameter, which is a power offset value between SSS and CSI-RS, because if some antenna elements corresponding to one antenna port are turned off, it may affect the CSI-RS power value).

[0146] If the method of CSI framework method 2 is applied, when the number of A1 APs (or P1 power value) is set for CSI-RS index #n1 belonging to a resource set and the number of A2 APs (or P2 power value) is set for CSI-RS index #n2 belonging to the same resource set, the sub-configuration index #s1 is set to be linked with CSI-RS index #n1 and the sub-configuration index #s2 is set to be linked with CSI-RS index #n2, so that a different spatial domain adaptation pattern can be set for each sub-configuration. If the method of CSI framework method 3 is applied, when the number of A1 APs (or P1 / P2 power values) is set for CSI-RS index #n1 belonging to the resource set, the number of A1 APs (or P1 power values ​​or delta1 from the P1 power values) is linked to sub-configuration index #s1, and the number of A2 APs (or P2 power values ​​or delta2 from the P1 power values) that is less than A1 constituting CSI-RS index #n1 is linked to sub-configuration index #s2, so that a different spatial domain adaptation pattern can be set for each sub-configuration.

[0147] Additionally, the power domain adaptation pattern may mean that the power offset value (e.g., the power offset value determined by the powerControlOffset parameter, which is the power offset value between the PDSCH and the CSI-RS, the powerControlOffsetSS parameter, which is the power offset value between the SSS and the CSI-RS, etc.) changes.

[0148] If the method of CSI framework method 2 is applied, when the CSI-RS index #n1 belonging to a resource set is set to a P1 power value and the CSI-RS index #n2 belonging to the same resource set is set to a P2 power value, the sub-setting index #s1 is set to be linked with the CSI-RS index #n1 and the sub-setting index #s2 is set to be linked with the CSI-RS index #n2, so that the power domain adaptation pattern can be set differently for each sub-setting.

[0149] If the method of CSI framework method 3 is applied, when the P1 power value (and the P2 power value) are set for the CSI-RS index #n1 belonging to the resource set, the P1 power value is linked to the sub-configuration index #s1 and the P2 power value (or the delta from the P1 power value) is linked to the sub-configuration index #s2, so that the power domain adaptation pattern can be set differently for each sub-configuration. A CSI report composed of CSIs corresponding to N (N value greater than or equal to L and less than or equal to 1) sub-configurations among the L sub-configurations (by utilizing one of the methods of option 1, option 2, and option 3 described above) can be fed back to the base station.

[0150] As described above, one or more sub-settings may be set within a single CSI reporting setting, and within each sub-setting, one or a combination of the following settings may be set.

[0151] - A list of IDs of one or more CSI-RS resource(s).

[0152] - Antenna port subset indication consisting of a bitmap

[0153] - Additional power offset delta from the EPRE offset between PDSCH and CSI-RS set within the CSI-RS resource configuration.

[0154] For convenience of explanation, a CSI reporting configuration that includes a sub-configuration in which an ID list of one or more CSI-RS resource(s) is set is referred to as type 2 SD (spatial domain) adaptation. A CSI reporting configuration that includes a sub-configuration in which an antenna port subset indication consisting of a bitmap is set is referred to as type 1 SD adaptation. A CSI reporting configuration that includes a sub-configuration in which an additional power offset delta value is set is referred to as power domain (PD) adaptation. One or more ID lists of CSI-RS resource(s) and / or power offset delta values ​​may be set for sub-configuration(s) belonging to a CSI reporting configuration, in which case it is referred to as type 2 SD+PD adaptation. A bitmapped antenna port subset indication and / or power offset delta values ​​may be set for sub-configuration(s) belonging to a CSI reporting configuration, in which case it is referred to as type 1 SD+PD adaptation.

[0155] For type 1 SD or PD or type 1 SD+PD adaptation, each CSI-RS resource can be associated with all sub-configurations configured within one CSI reporting configuration, respectively, and for type 2 SD, each CSI-RS resource can be associated with only a single sub-configuration among multiple sub-configurations within one CSI reporting configuration. For type 2 SD+PD adaptation, list #1 of CSI-RS resource(s) configured in a sub-configuration within the same CSI reporting configuration and list #2 of CSI-RS resource(s) configured in another sub-configuration may be identical to or disjoint from each other.

[0156] Meanwhile, when L sub-configurations are configured within a CSI reporting configuration, the UE can report CSI information corresponding to each of the L sub-configurations to the base station via a PUSCH / PUCCH. Among the L sub-configurations, only N (N is 1 or more and less than L) sub-configurations(es) can be activated or triggered via MAC-CE or DCI, in which case the UE can report CSI information corresponding to each of the N sub-configurations to the base station via a PUSCH / PUCCH. Specifically, for a CSI reporting configuration in which semi-persistent CSI reporting on PUCCH is configured, N sub-configurations(es) among the L sub-configurations configured via MAC-CE can be activated, and for a CSI reporting configuration in which semi-persistent CSI reporting on PUSCH or aperiodic CSI reporting is configured, N sub-configurations(es) among the L sub-configurations configured via DCI can be triggered.

[0157] Network Energy Saving (NES)

[0158] Energy conservation at base stations is a key consideration in wireless communication systems, as it can contribute to building eco-friendly networks by reducing carbon emissions and reducing operational expenditures (OPEX) for telecommunications companies. In particular, the introduction of next-generation wireless communications requires higher transmission rates, necessitating base stations to be equipped with more antennas and provide services across wider bandwidths and frequency bands.

[0159] Because of this, the energy cost of the base station increases excessively, so the base station needs to apply energy-saving methods.

[0160] A base station may operate technologies such as controlling on / off for a certain duration in the time axis for NES purposes, controlling transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency-axis resources, controlling transmission power, or turning on / off antenna ports and / or TRPs in the spatial domain. A state in which such technologies (defined / referred to as NES_tech for convenience of explanation) are applied may be defined / referred to as NES mode or NES state.

[0161] The base station may inform the terminal of which NES technology(s) are applied for each NES technology (or corresponding group) (Method 1), or may pre-set the corresponding NES technology(s) (or corresponding group)(s) for each code-point of a specific indicator (for example, the indicator may be indicated by DCI or MAC CE, etc., or may be an indicator set by upper layer signaling) (Method 2).

[0162] For example, in case of method 1, if at least one NES_technology is applied, the terminal can define the state as NES mode or NES state, or it can be referred to as a different NES mode or different NES state depending on which NES_technology is applied. In contrast, in case of method 2, for example, when there is a 1-bit indicator, when '0' does not correspond to a corresponding NES_technology and '1' corresponds to one or more NES_technology, the terminal can define the state as NES mode or NES state when it receives '1' from the indicator. As another example, when there is a 2-bit indicator, if '00' has no corresponding NES_technology, '01' has one or more NES_technology_As associated, '10' has one or more NES_technology_Bs associated, and '11' has one or more NES_technology_Cs associated, the terminal can define the state as NES mode or NES state when it receives a code-point other than '00' from the indicator. On the other hand, if the terminal receives '01', it is defined as NES state #1, if it receives '10', it is defined as NES state #2, if it receives '11', it is defined as NES state #3, and so on. Based on this, it can be distinguished whether it is an NES state or not or which NES state it is for each code-point.

[0163] A base station can turn on or off certain spatial elements or adjust the power value for a downlink signal / channel for the purpose of NES. In the present disclosure, spatial elements may mean antenna ports, active transceiver chains, panels, or TRPs. In order to dynamically apply various NES techniques in the spatial domain and power domain, the base station can link CSI-RS resources (sets) having different antenna ports for a single CSI reporting setting (e.g., CSI-ReportConfig), or can link multiple power offsets (e.g., powerControlOffset parameter, which is a power offset value between PDSCH and CSI-RS, powerControlOffsetSS parameter, which is a power offset value between SSS and CSI-RS, etc.).

[0164] Operation and measurement methods for on-demand SSB (synchronization signal block)

[0165] From the perspective of a base station operating multiple frequency bands, even when the number of terminals served is small or the traffic load is relatively low, the amount of energy consumed by periodically transmitting SSB and / or system information, etc. may be large.

[0166] In the description of the present disclosure, frequency band may be replaced with band, carrier, serving cell, or BWP.

[0167] FIG. 7 illustrates an SSB transmission method of a base station operating multiple frequency bands that can be applied to the present disclosure.

[0168] Referring to FIG. 7, a base station operating on three frequency bands may periodically transmit (legacy) SSB only on some frequency bands (e.g., F1 in FIG. 7). Conversely, the base station may transmit simplified (or modified) SSB (S-SSB) on the remaining frequency bands (e.g., F2 in FIG. 7) or may not transmit SSB on other frequency bands (e.g., F3 in FIG. 7). Through this, the base station may achieve energy conservation.

[0169] In this regard, a terminal operating in F2 or F3 can request SSB transmission from a base station in the corresponding frequency band. The SSB transmitted based on this request may be referred to as on-demand SSB. This on-demand SSB may be (legacy) SSB or S-SSB.

[0170] The frequency band where the base station periodically transmits SSB may correspond to a non-NES frequency band, and other frequency bands may correspond to NES frequency bands. For convenience of explanation, a cell where SSB may not be transmitted (e.g., the aforementioned NES frequency band), such as F2 or F3, may be referred to as an SSB-less cell. For example, from the terminal's perspective, an SSB-less cell may be a PCell, PSCell, or SCell.

[0171] The present disclosure specifically proposes methods for operating on-demand SSB in an SSB-less cell, (configuration) information related thereto, and performing measurements for on-demand SSB.

[0172] In relation to the method proposed in the present disclosure, the operation of a terminal in a (RRC) connected mode / state (hereinafter, CONNECTED terminal) and the operation of a terminal in an idle or inactive mode / state (hereinafter, IDLE / INACTIVE terminal) may be considered.

[0173] For example, with respect to the method related to on-demand SSB in an SSB-less cell described in the present disclosure, a CONNECTED terminal may be based on a CA (carrier aggregation) operation (e.g., a CA operation supported in a 5G / 6G-based wireless communication system, etc.). In this case, the SSB-less cell may correspond to a PCell, a PSCell, or a SCell for the CA operation. In addition, an IDLE / INACTIVE terminal may be based on a NES operation (e.g., a NES operation supported in a 5G / 6G-based wireless communication system, etc.). In this case, an SSB-less cell may correspond to a cell to which the NES operation is applied (e.g., an NES cell). Alternatively, on-demand SSB may be operated in a cell to which the NES operation is not applied (e.g., a non-NES cell).

[0174] In connection with the proposed method in the present disclosure, an IDLE / INACTIVE terminal can (re)select a cell to determine the first cell as a serving cell and obtain system information from the first cell. In addition, a CONNECTED terminal can obtain system information from the first cell or obtain system information by receiving DCI, MAC-CE, or terminal-specific message transmitted by a base station.

[0175] At this time, the terminal can confirm that the second cell / TRP supports and / or operates the SSB-less cell / TRP operation and / or the on-demand SSB operation through the acquired system information of the first cell (e.g., MIB, SIB1, or other SIB) or the DCI / MAC-CE / terminal-only message. For this purpose, information (e.g., an indicator) indicating that the second cell / TRP supports the SSB-less cell / TRP operation and / or the on-demand SSB operation may be included in the system information or the DCI / MAC-CE / terminal-only message of the first cell. Additionally or alternatively, a UL resource (e.g., PRACH resource / preamble, etc.) setting for requesting on-demand SSB for the second cell / TRP may be included. Additionally or alternatively, a reference signal (RS) setting mapped to the second cell / TRP or a reference signal (RS) setting mapped to a specific on-demand SSB of the second cell / TRP or a reference signal (RS) setting in a quasi-co-location (QCL) relationship may be included.

[0176] In connection with the proposed method in the present disclosure, a reference signal (RS) may be a reference signal (RS) for a first cell / TRP or a second cell / TRP, and may be a reference signal (RS) mapped to a specific SSB (or a specific SSB index) of the first cell / TRP or the second cell / TRP. A plurality of reference signals (RS) may be configured as a set of reference signals (RS), and each reference signal (RS) in the set may be indicated by a different reference signal (RS) index. Different reference signal (RS) indices may be mapped or connected in a QCL relationship to different SSB indices of the first cell / TRP or the second cell / TRP.

[0177] When a reference signal (RS) is set for the second cell / TRP, a terminal supporting NES can perform layer 1 or layer 3-based measurement targeting the reference signal (RS). At this time, the reference signal (RS) may be an SSB, CSI-RS, or a separate new reference signal (RS) of the first cell / TRP or the second cell / TRP.

[0178] In this regard, the terminal may trigger the above-described measurement when one or more of the following conditions are satisfied.

[0179] - Condition 1. If the terminal supports SSB-less cell / TRP operation and / or on-demand SSB operation for NES.

[0180] - Condition 2. If a message indicating a transition from CONNECTED mode to IDLE / INACTIVE mode (e.g., RRC release message) sets / instructs the above-mentioned measurement.

[0181] - Condition 3. If the system information acquired by the terminal from the serving cell sets / instructs the aforementioned measurement.

[0182] - Condition 4. If the SSB (or CSI-RS) measurement value for the first cell / TRP is below the threshold value.

[0183] - Condition 5. If the frequency priority for the second cell / TRP is higher than the frequency priority for the first cell / TRP.

[0184] - Condition 6. If the RACH process fails in the first cell / TRP

[0185] - Condition 7. If a radio link failure or beam failure occurs in the first cell / TRP.

[0186] - Condition 8. When a command is received from the first cell / TRP instructing to perform measurements in the manner described above (for example, the command may be received via an RRC message, MAC-CE, or DCI).

[0187] The terminal performs an UL transmission (e.g., a PRACH transmission) requesting an on-demand SSB for a second cell / TRP according to UL resource configuration in the first cell / TRP or the second cell / TRP, and thereafter, the terminal can receive the requested on-demand SSB in the second cell / TRP. At this time, a specific UL resource (e.g., a specific PRACH resource / preamble) can be mapped to one or more specific on-demand SSB indices, and different UL resource(s) can be mapped to different on-demand SSB indices. In addition, a specific UL resource can be mapped to one, multiple, or all of MIB, SIB1, SIBx (wherein, x>1 is an integer), and on-demand SSB, and based on this, the terminal can be configured to request one, multiple, or all of them.

[0188] Alternatively, the terminal may trigger the RACH to request an on-demand SSB, and may request one, multiple, or all of MIB, SIB1, SIBx (wherein x is an integer > 1), and on-demand SSB via RACH MSG3 or RACH MSGA. For example, the RACH MSG3 or RACH MSGA may transmit a UCI / MAC-CE / RRC message, and the UCI / MAC-CE / RRC message may include information (e.g., an indicator) requesting one, multiple, or all of MIB, SIB1, SIBx (wherein x is an integer > 1), and on-demand SSB. For example, the UCI / MAC-CE / RRC message may include information (e.g., an indicator) requesting an on-demand SSB, or may include SSB index(es) corresponding to the SSB(s) to be requested. Additionally, the UCI / MAC-CE / RRC message may include information indicating MIB (e.g., an indicator), information indicating SIB1 (e.g., an indicator), and information indicating SIBx (wherein x is an integer > 1). The UCI / MAC-CE / RRC message may include bitmap information composed of bits for each of the pieces of information, and multiple bit strings may be composed by connecting each piece of information.

[0189] The IDLE / INACTIVE terminal described above can perform UL transmission requesting on-demand SSB if one or more of the following conditions are satisfied.

[0190] - Condition A. A condition in which the measured value of the reference signal (RS) mapped to the second cell / TRP is higher than or equal to the offset value of the measured value of the reference signal (RS) for the first cell / TRP (e.g., cell defining SSB).

[0191] - Condition B. A condition in which the measured value of the reference signal (RS) mapped to the second cell / TRP is greater than or equal to the threshold value.

[0192] - Condition C. A condition where the measured value of the reference signal (RS) (e.g., cell defining SSB) for the first cell / TRP is below the threshold value.

[0193] - Condition D. A condition in which the frequency of the reference signal (RS) mapped to the second cell / TRP or the frequency for the second cell / TRP has a higher priority than the frequency for the first cell / TRP.

[0194] - Condition E. The second cell / TRP and the first cell / TRP belong to the same PLMN or an equivalent PLMN.

[0195] - Condition F. A condition in which the second cell is determined to be a suitable cell for the terminal based on system information about the second cell / TRP obtained from the first cell / TRP.

[0196] In this regard, the IDLE / INACTIVE terminal can receive on-demand SSB and MIB, SIB1, and SIBx for the second cell, and perform cell reselection from the first cell to the second cell.

[0197] Additionally or alternatively, an IDLE / INACTIVE terminal may receive SIB1 to acquire RACH configuration for the first cell or the second cell, and perform a RACH process for the first cell or the second cell to transition to CONNECTED mode. At this time, the PCell or PSCell of the terminal may be the first cell or the second cell. Thereafter, before or after transitioning to CONNECTED mode, the terminal may configure the second cell (or the first cell) as an SCell in addition to the first cell (or the second cell), which is the PCell or PSCell.

[0198] Additionally or alternatively, an IDLE / INACTIVE / CONNECTED terminal may request and receive all of the on-demand SSB, MIB, SIB1, and SIBx simultaneously via the aforementioned UL transmission, or may request and receive one or some of them. Alternatively, the terminal may first request the on-demand SSB, and then perform a separate UL transmission requesting the MIB, SIB1, and SIBx. Alternatively, the terminal may first request the on-demand SSB and MIB, and then perform a separate UL transmission requesting the SIB1 and SIBx.

[0199] Accordingly, the terminal may receive all of them together in a single request, sequentially request the on-demand SSB and MIB, SIB1, and SIBx, or sequentially receive them, or request and receive only some of them. For example, if the second cell is configured as a SCell, the terminal may request and receive only the on-demand SSB, and if necessary, may request and receive the on-demand SSB and MIB simultaneously in a single UL transmission. As another example, if the second cell is configured as a PSCell, the terminal may request and receive the on-demand SSB and MIB simultaneously and receive the on-demand SSB and MIB. As another example, if the second cell is configured as a PCell, the terminal may request and receive the on-demand SSB and MIB / SIB1 simultaneously or sequentially, receive the on-demand SSB and MIB / SIB1, and then request and receive SIBx according to the on-demand SI (system information) setting of SIB1.

[0200] In the proposed method of the present disclosure, the first cell / TRP and the second cell / TRP may be the same or different. Furthermore, the first TRP and the second TRP may belong to the same or different cells.

[0201] The embodiments described below are distinguished only for the sake of clarity of explanation, and a part / entire configuration of one embodiment may be applied in combination / combination with a part / entire configuration of another embodiment, or may be applied independently.

[0202] Example 1

[0203] Embodiment 1 relates to a method for performing radio resource management (RRM) measurement based on information related to transmission time of on-demand SSB.

[0204] The terminal can request an on-demand SSB for the second cell / TRP through an uplink transmission (e.g., RACH transmission, etc.). Accordingly, the terminal can receive an on-demand SSB for the second cell / TRP from the base station and perform measurement on the received on-demand SSB. If the measurement result for the on-demand SSB is above a certain level (e.g., if the measurement result for the on-demand SSB is above a threshold (predefined or set by the base station)), the terminal can determine that the on-demand SSB for the second cell / TRP has been received from the base station.

[0205] Assume that the terminal performs on-demand SSB measurement according to the configuration / instruction (via RRC message, DCI, or MAC-CE) of the base station. In this case, after receiving an on-demand SSB request or a DCI indicating that on-demand SSB is to be transmitted (e.g., DCI CRC-scrambled by SI-RNTI, DCI CRC-scrambled by P-RNTI) or / and an RRC message (e.g., system information, paging, etc.), the terminal may attempt to measure the on-demand SSB according to the configuration / instruction of the base station.

[0206] Below, we describe the RRM measurement and reporting methods for on-demand SSB. The RRM measurement and reporting methods for on-demand SSB described below can be applied to both L3-based and L1-based measurement and reporting.

[0207] Example 1-1

[0208] Example 1-1 relates to a method for measuring RRM of an on-demand SSB.

[0209] As an example of the present disclosure, it is assumed that an on-demand SSB is measured for a period longer than a specific T2 time interval with a measurement quality that is at least or exceeds a certain level (i.e., an on-demand SSB is received with a measurement quality that is at least a certain level for a period longer than a specific T2 time interval). The terminal / base station may apply a filter coefficient k to the first parameter in Equation 3 for L3 filtering.

[0210]

[0211] M in Equation 3 N means the most recently received measurement result from the physical layer, F N means updated filtered measurement results used for measurement reporting or evaluation of measurement criteria, F N-1 means the previously (old) filtered measurement result, and a is 1 / 2 (k / 4) . When the first measurement result is received from the physical layer, F0 can be set to M1, and k means the filter coefficient for the corresponding measurement quantity received by the layer 3 filtering and quantity setting information related to the measurement quantity.

[0212] If the measurement quality of the on-demand SSB is below or below a certain level and / or the on-demand SSB is measured for a shorter time period than a specific T2, the terminal / base station may not apply the filter coefficient (i.e., a=1) or may apply a second parameter to the filter coefficient k.

[0213] For example, the average of the measurement quality values ​​of at least one (on-demand) SSB index having a measurement quality value above a certain threshold may be defined / set as a measurement quality above a certain level described above. As another example, the measurement quality above a certain level may correspond to the best SSB index measured from at least one on-demand SSB (or, the measurement quality associated with the best SSB index).

[0214] As an example of the present disclosure, a base station may set a periodic time interval for measuring on-demand SSB for a terminal. If a periodic time interval for measuring on-demand SSB is set for a terminal, the terminal may measure on-demand SSB during the set periodic time interval (after an on-demand SSB measurement attempt).

[0215] Additionally or alternatively, the base station may set a time for the terminal to start on-demand SSB measurements. If T3 is set for the terminal as the time to start on-demand SSB measurements, the terminal may start on-demand SSB measurements after T3 has elapsed after an on-demand SSB request or after receiving a DCI (e.g., SI-RNTI DCI, P-RNTI DCI, etc.) or an RRC message (e.g., system information, paging information, etc.) indicating that on-demand SSB is to be transmitted.

[0216] A base station can request on-demand SSB measurement by transmitting a DCI or MAC CE to the terminal. If a measurement or / and reporting request is made via the DCI or MAC CE, the terminal can initiate on-demand SSB measurement. Furthermore, if a measurement or / and reporting request is made via the DCI or MAC CE, the terminal can report the on-demand SSB measurement results.

[0217] Additionally or alternatively, the terminal may periodically report on-demand SSB measurement results. At this time, the terminal may receive configuration information related to the reporting cycle of on-demand SSB measurement results from the base station and apply the reporting cycle to the on-demand SSB measurement results reporting.

[0218] Additionally or alternatively, the terminal may report on-demand SSB measurement results to the base station only when specific events are met. The types and / or conditions of specific events may be predefined, but may also be configured by the base station.

[0219] Additionally or alternatively, if on-demand SSB measurement results are available, the terminal may transmit the on-demand SSB measurement results to the base station only once.

[0220] Example 1-2

[0221] Example 1-2 relates to a method for reporting RRM measurements of on-demand SSB.

[0222] As an example of the present disclosure, it is assumed that an on-demand SSB is received for a longer period than a specific T1 time interval with a measurement quality higher than a certain level (i.e., an on-demand SSB is received with a measurement quality higher than a certain level for a specific T1 time interval). In this case, the terminal may transmit / report the measurement result for the on-demand SSB to the base station according to the configuration of the base station. Additionally or alternatively, when the condition of a specific event (e.g., an A5 event, an A6 event, etc.) is satisfied, the terminal may trigger the specific event and then transmit / report the measurement result for the on-demand SSB to the base station (e.g., an event-triggered reporting operation).

[0223] Otherwise (e.g., if the measurement quality of the on-demand SSB is below or below a certain level and / or the on-demand SSB is measured for a period shorter than a certain T2 time interval), the terminal may operate according to at least one of the options described below until the on-demand SSB is received for a period longer than a certain T1 time interval with a measurement quality above the certain level.

[0224] Option A: The terminal may only report periodic (on-demand SSB) measurement results (e.g., report measurement results periodically) or may not perform event-triggered reporting operations.

[0225] Option B: The terminal may perform only event-triggered actions and may not perform periodic (on-demand SSB) measurement result reporting.

[0226] Option C: The terminal may not perform both periodic (on-demand SSB) measurement result reporting and event-triggered reporting.

[0227] Option D: Assume that periodic measurement result reporting is configured for the terminal (e.g., configuration information related to periodic reporting of on-demand SSB measurement results is transmitted from the base station to the terminal). The terminal can perform the periodic measurement result reporting operation in the first cycle until the on-demand SSB is received for a longer period than a specific T1 time interval with a measurement quality level or higher. Then, the terminal can perform the periodic measurement result reporting operation in the second cycle after the on-demand SSB is received for a longer period than a specific T1 time interval with a measurement quality level or higher.

[0228] Option E: Assume that an event-triggered reporting operation is configured for the terminal (e.g., configuration information for an event related to reporting of on-demand SSB measurement results is transmitted from the base station to the terminal). In this case, the terminal may report the measurement results to the base station using a time-to-trigger of a first length until the on-demand SSB is received for a longer period of time than a specific T1 time interval with a measurement quality level or higher. Then, the terminal may report the measurement results to the base station using a time-to-trigger of a second length after the on-demand SSB is received for a longer period of time than a specific T1 time interval with a measurement quality level or higher.

[0229] Here, the action of reporting a measurement result by applying a time-to-trigger of a specific length may include i) an action of reporting a measurement result after triggering an event when a condition related to the event is satisfied within a time period of a specific length, or / and ii) an action of reporting a measurement result during a time period of a specific length as the event is triggered.

[0230] As an example of the present disclosure, a base station may set a periodic time interval for reporting on-demand SSB measurement results for a terminal. If a periodic time interval for reporting on-demand SSB measurement results is set for a terminal, the terminal may report on-demand SSB measurement results to the base station during the set periodic time interval (after an on-demand SSB measurement attempt). In this case, the terminal may periodically report on-demand SSB measurement results during the periodic time interval. Additionally or alternatively, the terminal may perform an event-based reporting operation during the periodic time interval.

[0231] Additionally or alternatively, the base station may set a start time for the UE to be able to report on-demand SSB measurement results. If the start time T4 for the UE to be able to report on-demand SSB measurement is set, the UE may be able to report on on-demand SSB measurements if T4 has elapsed since the UE has requested an on-demand SSB or received a DCI (e.g., SI-RNTI DCI, P-RNTI DCI, etc.) or an RRC message (e.g., system information, paging information, etc.) indicating that on-demand SSB is to be transmitted. That is, if T4 has not elapsed since the UE has requested an on-demand SSB or received a DCI or an RRC message indicating that on-demand SSB is to be transmitted, the UE may not perform periodic measurement result reporting or event-triggered reporting.

[0232] A base station can request on-demand SSB measurement results reporting by transmitting a DCI or MAC CE to a terminal. If a measurement or / and reporting request is made via the DCI or MAC CE, the terminal can report on-demand SSB measurement results to the base station. Furthermore, if a measurement or / and reporting request is made via the DCI or MAC CE, the terminal can report on-demand SSB measurement results.

[0233] Additionally or alternatively, the terminal may periodically report on-demand SSB measurement results. At this time, the terminal may receive configuration information related to the reporting cycle of on-demand SSB measurement results from the base station and apply the reporting cycle to the on-demand SSB measurement results reporting.

[0234] Additionally or alternatively, the terminal may report on-demand SSB measurement results to the base station only when specific events are met. The types and / or conditions of specific events may be predefined, but may also be configured by the base station.

[0235] Additionally or alternatively, if on-demand SSB measurement results are available, the terminal may transmit the on-demand SSB measurement results to the base station only once.

[0236] Example 2

[0237] The present embodiment relates to a method for determining whether an SSB-less cell / TRP and / or an on-demand SSB is in operation based on the measurement results of a specific reference signal (RS).

[0238] The terminal can measure reference signals (RS) for the first cell / TRP or the second cell / TRP, and determine that the second cell / TRP corresponds to an SSB-less cell / TRP and / or operates on-demand SSB based on whether the measured values ​​(e.g., RSRP, RSRQ, RSSI, etc.) are above or below a specified threshold. If on-demand SSB is in operation, the terminal can request on-demand SSB, and if on-demand SSB is not in operation, the terminal may not request on-demand SSB.

[0239] At this time, the overall measurement value for the reference signal (RS) may be determined as an average value for the measurement values ​​for each reference signal (RS) index within the reference signal (RS) set constituting the reference signals (RS), or may be determined as a best value (or worst value) for the measurement values ​​for each reference signal (RS) index within the reference signal (RS) set. In addition, the aforementioned threshold value may be set through the system information of the first cell and / or a terminal-only message. In the case of an IDLE / INACTIVE terminal, the terminal-only message may be an RRC release message.

[0240] Specifically, the terminal can perform the following actions:

[0241] If the total measurement value described above is above or below the threshold value, the terminal can determine that on-demand SSB for the second cell / TRP is in operation or not in operation for all SSB indices.

[0242] For example, if the measurement value is greater than or equal to a threshold, the terminal may determine that on-demand SSB for the second cell / TRP is in operation. Accordingly, if on-demand SSB transmission is not detected, the terminal may request on-demand SSB, and if detected, the terminal may not request on-demand SSB. Alternatively, if the measurement value is greater than or equal to the threshold, the terminal may determine that SSB for the second cell / TRP is being transmitted and there is no need to request on-demand SSB.

[0243] For another example, if the measurement value is below the threshold, the terminal may determine that on-demand SSB for the second cell / TRP is not in operation. Therefore, the terminal may not request on-demand SSB. Alternatively, if the measurement value is below the threshold, the terminal may determine that SSB for the second cell / TRP is not being transmitted and may request on-demand SSB.

[0244] Additionally or alternatively, if an individual measurement value of a particular reference signal (RS) index is above or below a threshold value, the terminal may determine that on-demand SSB is in operation or not in operation for the SSB index mapped to the particular reference signal (RS) index for the second cell / TRP.

[0245] For example, if an individual measurement value of a specific reference signal (RS) index is greater than or equal to a threshold value, the terminal may determine that on-demand SSB is in operation for an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP. Accordingly, if an on-demand SSB transmission is not detected, the terminal may request on-demand SSB for the corresponding SSB index, and if an on-demand SSB transmission is detected, the terminal may not request on-demand SSB for the corresponding SSB index. Alternatively, if an individual measurement value of a specific reference signal (RS) index is greater than or equal to the threshold value, the terminal may determine that SSB is being transmitted for the SSB index mapped to the specific reference signal (RS) for the second cell / TRP and that there is no need to request on-demand SSB for the corresponding SSB index.

[0246] For another example, if an individual measurement value of a specific reference signal (RS) index is less than or equal to a threshold, the terminal may determine that on-demand SSB is not in operation for an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP. Accordingly, the terminal may not request on-demand SSB for the corresponding SSB index. Alternatively, if an individual measurement value of a specific reference signal (RS) index is less than or equal to a threshold, the terminal may determine that SSB is not being transmitted for an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP and may request on-demand SSB for the corresponding SSB index.

[0247] Additionally or alternatively, if the overall measurement value described above is greater than or less than a threshold value, the terminal may determine whether or not SSB for the second cell / TRP is transmitted for all SSB indices. For example, if the measurement value is greater than or equal to the threshold value, the terminal may determine that SSB for the second cell / TRP is being transmitted and that there is no need to request on-demand SSB. For another example, if the measurement value is less than or equal to the threshold value, the terminal may determine that SSB for the second cell / TRP is not being transmitted and that on-demand SSB can be requested (e.g., if on-demand SSB is configured).

[0248] Additionally or alternatively, if an individual measurement value of a specific reference signal (RS) index is greater than or equal to a threshold value, the terminal may determine that an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP is transmitted or not transmitted. For example, if an individual measurement value of a specific reference signal (RS) index is greater than or equal to the threshold value, the terminal may determine that an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP is being transmitted. Accordingly, the terminal may determine that there is no need to request on-demand SSB for the corresponding SSB index. For another example, if an individual measurement value of a specific reference signal (RS) index is less than or equal to the threshold value, the terminal may determine that an SSB index mapped to the specific reference signal (RS) index for the second cell / TRP is not being transmitted. Accordingly, the terminal may determine that it is possible to request on-demand SSB for the corresponding SSB index (e.g., if on-demand SSB is configured).

[0249] Upon receiving an on-demand SSB request from a terminal, a base station may operate to transmit SSB(s) for the corresponding SSB index for the second cell / TRP or for the entire SSB index so that the terminal can receive them. At this time, the on-demand SSB transmission may be performed at a resource location where existing (e.g., legacy) SSBs are transmitted, or may be configured to be performed on a separate resource (e.g., at a specific opportunity).

[0250] Example 3

[0251] This embodiment relates to a method for determining radio resource management (RRM) based on the measurement results of a specific reference signal (RS).

[0252] When setting up RRM measurement for the second cell / TRP, the base station can set the SSB or reference signal (RS) for the first cell / TRP as a measurement object. At this time, the RRM measurement setting for the first cell / TRP can also set the same SSB or reference signal (RS) as a measurement object. In other words, the first cell / TRP measurement and the second cell / TRP measurement can be set up as the same measurement object. In other words, the same measurement object can be set for the measurement for the first cell / TRP and the measurement for the second cell / TRP.

[0253] At this time, the measurement report message transmitted by the base station to the terminal may include the first cell / TRP measurement report settings (e.g., report cycle, measurement event, time to trigger, etc.), and the second cell / TRP measurement report may instruct (the terminal) to refer to the first cell / TRP measurement report settings. A terminal that receives such a message may apply the first cell / TRP measurement report settings to the second cell / TRP measurement report. That is, the terminal may perform a measurement report for the second cell / TRP based on the first cell / TRP measurement report settings.

[0254] In this regard, when the terminal periodically performs the first cell / TRP measurement report and the second cell / TRP measurement report according to the settings of the base station, or performs the first cell / TRP measurement report and the second cell / TRP measurement report according to a specific event (e.g., A1, A2, A3, etc.), the first cell / TRP measurement report and the second cell / TRP measurement report are triggered simultaneously, so that the terminal can report the first cell / TRP measurement report and the second cell / TRP measurement report as a single message at the same reporting time. At this time, a message that transmits / forwards the first cell / TRP measurement report and the second cell / TRP measurement report based on the measurement results set as the same measurement target may include information on only one measurement report among the first cell / TRP measurement report and the second cell / TRP measurement report. For example, the terminal may include only the first cell / TRP measurement report, which is a PCell / PSCell, in the message, and may not include the second cell / TRP measurement report, which is an SCell. In this regard, the terminal may configure and transmit the message so that the second cell / TRP measurement report, which is SCell, indicates the first cell / TRP measurement report.

[0255] This method can be efficient in reporting one measurement result among different reference signals (RSs) set as the same measurement target. Furthermore, since multiple reference signals are set as the same measurement target, there is no need to provide separate measurement reporting settings for on-demand SSB, which can be efficient in terms of signaling and / or operation.

[0256] Example 4

[0257] This embodiment relates to a RACH method for cells / TRPs associated with on-demand SSB.

[0258] In connection with the method proposed in the present disclosure, the terminal can perform RACH for a cell / TRP associated with on-demand SSB, for example, a second cell / TRP.

[0259] For example, the UE may perform RACH for reasons such as PDCCH order, UL time alignment, scheduling request (SR), or mobility. Alternatively, the UE may perform RACH to request on-demand SSB or system information for the second cell / TRP.

[0260] Additionally, if the beam failure instance indicator for the second cell / TRP is greater than or equal to the maximum value, the UE may report a BSR MAC CE or a PUCCH SR (e.g., if the second cell / TRP is a SCell) or trigger a RACH (e.g., if the second cell / TRP is a PCell / PSCell). In this case, the BSR MAC CE, PUCCH SR, or RACH transmission for the second cell / TRP may be performed in the first cell / TRP, the second cell / TRP, or the third cell / TRP. In addition, for the BSR MAC CE transmission, the UE may perform PRACH resource transmission of the first cell / TRP, the second cell / TRP, or the third cell / TRP, and transmit the BSR MAC CE through a RACH MSG3 or MSGA message accordingly.

[0261] In this regard, the first cell may be a PCell / PSCell, and the second cell and the third cell may be SCells. Alternatively, the second cell may be a PCell / PSCell, and the first cell and the third cell may be SCells. In addition, the first TRP, the second TRP, and the third TRP may be the same PCell / PSCell or SCell, or two or three of the first TRP, the second TRP, and the third TRP may belong to the same or different PCell / PSCell or SCell. In addition, for the aforementioned RACH operation, the first cell / TRP or the third cell / TRP may be set as a reference cell / TRP for the second cell / TRP.

[0262] If RACH is performed using PRACH resources of the second cell / TRP based on the reasons for the second cell / TRP as described above, the terminal may perform the following operations.

[0263] If an SSB (or CSI-RS) for a cell / TRP (e.g., a second cell / TRP) belonging to a PRACH resource is being transmitted, the terminal can measure the SSB (or CSI-RS) and select a PRACH resource based on the SSB and perform transmission.

[0264] Additionally or alternatively, if the SSB (or CSI-RS) for a cell / TRP (e.g., a second cell / TRP) belonging to a PRACH resource is available but is not being transmitted during the DTX inactive period, the UE may measure the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP or the reference signal (RS) in the present disclosure during the DTX inactive period, and select a PRACH resource based thereon to perform transmission.

[0265] Additionally or alternatively, if the SSB (or CSI-RS) for a cell / TRP (e.g., a second cell / TRP) belonging to a PRACH resource is not available and is not being transmitted based on whether it is an on-demand SSB or SSB-less cell / TRP, the UE may measure the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP or the reference signal (RS) in the present disclosure, and select a PRACH resource based thereon to perform transmission.

[0266] Additionally or alternatively, if the SSB (or CSI-RS) for a cell / TRP (e.g., a second cell / TRP) belonging to a PRACH resource is not available and is not being transmitted based on whether it is an on-demand SSB or SSB-less cell / TRP, the UE may request an on-demand SSB (or CSI-RS) for the second cell / TRP (if the DCI triggering the RACH triggers an on-demand SSB request), and then measure the requested on-demand SSB (or CSI-RS), and select a PRACH resource based on the measured SSB, and perform transmission.

[0267] Additionally or alternatively, if the SSB (or CSI-RS) for a cell / TRP (e.g., the second cell / TRP) belonging to the PRACH resource is not available and not being transmitted based on whether it is an on-demand SSB or SSB-less cell / TRP (if the DCI triggering the RACH triggers on-demand SSB without a separate on-demand SSB request), the UE may measure the on-demand SSB (or CSI-RS) for the second cell / TRP and select a PRACH resource based on the measurement, and perform transmission.

[0268] For the above-described operations, the terminal can set a mapping relationship by beam index for the SSB (or CSI-RS) of the second cell / TRP and the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP. For example, the base station can set the SSB index #k of the first cell / TRP or the third cell / TRP to be mapped to the SSB index #m of the second cell / TRP in a QCL relationship, and can transmit the setting to the terminal through system information or a terminal-specific message. Based on this, if the measured value for the SSB index #k of the first cell / TRP or the third cell / TRP is equal to or greater than a threshold value, the terminal can select a PRACH resource / preamble for the SSB index #m of the second cell / TRP and perform transmission.

[0269] Additionally or alternatively, (if no separate mapping setting is made) the terminal may select a PRACH resource assuming that the beam index-wise directions for the SSB (or CSI-RS) for the second cell / TRP and the SSB (or CSI-RS) for the first cell / TRP or the third cell / TRP are the same. For example, the SSB index #k of the second cell / TRP and the SSB index #k of the first cell / TRP or the third cell / TRP may be assumed to have a QCL relationship with each other. Based on this, if the measured value for the SSB index #k of the first cell / TRP or the third cell / TRP is equal to or greater than a threshold value, the terminal may select a PRACH resource / preamble for the SSB index #k of the second cell / TRP to perform transmission.

[0270] On the other hand, when performing RACH with PRACH resources of the first cell / TRP or the third cell / TRP based on the reasons for the second cell / TRP as described above, the terminal may perform the following operations.

[0271] A case may be considered where there is an SSB (or CSI-RS) for the second cell / TRP, or there is no SSB (or CSI-RS) for the second cell / TRP and there is an SSB (or CSI-RS) for a cell / TRP (e.g., the first cell / TRP or the third cell / TRP) belonging to the PRACH resource, or there is an SSB (or CSI-RS) for the second cell / TRP but there is an SSB (or CSI-RS) for a cell / TRP (e.g., the first cell / TRP or the third cell / TRP) belonging to the PRACH resource.

[0272] In this regard, if an SSB (or CSI-RS) for the second cell / TRP is being transmitted, the terminal measures the SSB (or CSI-RS) and, based on this, selects a PRACH resource as the PRACH resource of the first cell / TRP or the third cell / TRP to perform transmission.

[0273] Additionally or alternatively, if the SSB (or CSI-RS) for the second cell / TRP is available but is not being transmitted during the DTX inactive interval, the UE may measure the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP or the reference signal (RS) in the present disclosure during the DTX inactive interval (or always regardless of DTX activation / deactivation), and select a PRACH resource based thereon to perform transmission.

[0274] Additionally or alternatively, if the SSB (or CSI-RS) for the second cell / TRP (based on whether it is an on-demand SSB or SSB-less cell / TRP) is not available and is not being transmitted, the UE may measure the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP or the reference signal (RS) in the present disclosure, and select a PRACH resource based thereon to perform transmission. If the RACH is triggered via DCI, and the DCI does not indicate an on-demand SSB trigger, the UE may measure the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP or the reference signal (RS) in the present disclosure, and select a PRACH resource based thereon to perform transmission.

[0275] For the above-described operations, the terminal can set a mapping relationship by beam index for the SSB (or CSI-RS) of the second cell / TRP and the SSB (or CSI-RS) of the first cell / TRP or the third cell / TRP. For example, the base station can set the SSB index #k of the first cell / TRP or the third cell / TRP to be mapped to the SSB index #m of the second cell / TRP in a QCL relationship, and can transmit the setting to the terminal through system information or a terminal-specific message. Based on this, if the measured value for the SSB index #k of the second cell / TRP is equal to or greater than a threshold value, the terminal can select a PRACH resource / preamble for the SSB index #m of the first cell / TRP or the third cell / TRP and perform transmission.

[0276] Additionally or alternatively, (if no separate mapping setting is made) the terminal may select a PRACH resource assuming that the beam index-wise directions for the SSB (or CSI-RS) for the second cell / TRP and the SSB (or CSI-RS) for the first cell / TRP or the third cell / TRP are the same. For example, the SSB index #k of the second cell / TRP and the SSB index #k of the first cell / TRP or the third cell / TRP may be assumed to have a QCL relationship with each other. Based on this, if the measured value for the SSB index #k of the second cell / TRP is equal to or greater than a threshold value, the terminal may select a PRACH resource / preamble for the SSB index #k of the first cell / TRP or the third cell / TRP to perform transmission.

[0277] Hereinafter, a method of operating an SSB-less cell and an on-demand SSB applicable to the method proposed in the present disclosure (e.g., Embodiment 1, Embodiment 1-1, Embodiment 1-2, Embodiment 2, Embodiment 3 and / or Embodiment 4) is described.

[0278] A base station can configure / indicate for a serving cell that it is an SSB-less cell and / or that on-demand SSB is in operation via RRC message, MAC-CE, and / or DCI (cell-common, cell-specific, terminal group-common, or terminal-specific). If a terminal recognizes for a serving cell that it is an SSB-less cell and / or that on-demand SSB is in operation through receipt of the configuration / indication, it can not expect to receive SSB through the serving cell and can transmit a UL signal / channel configured for on-demand SSB use for an SSB request in the serving cell.

[0279] Specifically, for SCell, such information may be conveyed via RRC signaling and / or SCell activation MAC-CE for configuring and / or adding SCells. For example, when configuring and / or adding a SCell via RRC signaling, the UE may be notified that the SCell is an SSB-less cell and that on-demand SSB is in operation. For another example, when configuring and / or adding a SCell via RRC signaling, the UE may be notified that the SCell is an SSB-less cell and that on-demand SSB may be in operation, and information about whether the SCell is actually an SSB-less cell and / or that on-demand SSB is in operation may be indicated via MAC-CE.

[0280] When an SCell is activated based on the signaling described above and is configured / indicated to be an SSB-less cell and / or to have on-demand SSB operation, SSB may be transmitted on the SCell for a period of time T (e.g., the T value may be predefined or may be a value set by the base station). Alternatively, whether SSB will be transmitted for the period of time T may be predefined or may be explicitly configured / indicated by RRC signaling or (SCell activation) MAC-CE.

[0281] In this regard, it may be necessary to set up a reference cell (ref-cell) corresponding to the SSB-less cell, and one or more candidates for the reference cell may be set up, and which cell is actually the reference cell may be set up / indicated through RRC signaling or MAC-CE (indicating activation) that sets up or adds the corresponding SSB-less cell.

[0282] Additionally or alternatively, different cells may be linked depending on the function of the reference cell. For example, cell #A may be configured / designated as a reference cell for timing synchronization and AGC setting of an SSB-less cell, cell #B may be configured / designated as a reference cell for UL power control (or path loss estimation), and cell #C may be configured / designated as a reference cell for measuring RRM instead. Alternatively, multiple reference cells may be configured / designated for the same function.

[0283] For example, when 2 TAs (timing advances) are configured for an SSB-less SCell (e.g., in a multi-TRP situation or IAB operation), a reference cell for timing sync (and AGC setting) corresponding to each TA can be configured / indicated separately. For another example, a reference cell (and a DL signal / channel transmitted from the reference cell) for UL power control (or path-loss estimation) can be configured differently depending on the UL signal / channel on the SSB-less SCell. For another example, different reference cells (and DL signals / channels transmitted from the reference cell) can be configured differently depending on the measurement type. As a specific example, for RSRP, SSB on cell #1 can be configured as a reference, and for L1-SINR, SSB or CSI-RS resource on cell #2 (or cell #1) can be configured as a reference.

[0284] Additionally or alternatively, one or more reference cells may be linked / configured / indicated for an SSB-less cell. In this case, a priority order may be required for which of the linked reference cells will acquire timing synchronization, AGC setting, UL power control (or path-loss estimation), beam management-related measurements, and / or RRM measurement functions. The priority order may be explicitly set / indicated, or even if the reference cell has a higher priority order, if the reference cell is inactive or in dormant BWP operation, the cell corresponding to the next priority order may be replaced as the reference cell.

[0285] Such priority ordering can also be set / defined at the signal / channel level rather than the cell level. For example, the SSB of the PCell, the CSI-RS (e.g., TRS) of the PCell, and the CSI-RS (e.g., TRS) of the SCell can be set as references for timing synchronization (and / or path-loss estimation) of the SSB-less SCell, and the SSB of the PCell can be set / indicated to have the highest priority and the CSI-RS of the SCell can be set / indicated to have the lowest priority, or a rule can be defined in advance.

[0286] A common reference cell may be configured / indicated for multiple SSB-less SCells, and for this purpose, the SSB-less SCells may be grouped. For example, when SCell indices #0 / 1 / 2 are all configured / indicated as SSB-less SCells and belong to the same group, the reference cells corresponding to the SCells belonging to the same group may be common. In particular, when a reference cell is configured / indicated for one of the SCells belonging to the same group, this may mean that the corresponding reference cell is automatically configured / indicated as the reference cell for other SCells in the same group.

[0287] Even if a reference cell corresponding to a specific SSB-less SCell (or the group to which the SCell belongs) is not configured, a default reference cell can be determined by a rule. If the SSB-less SCell belongs to a master cell group (MCG), the default reference cell can be the PCell, and if it belongs to a secondary cell group (SCG), the default cell can be the PSCell. Alternatively, if the SSB-less SCell does not belong to a primary timing advance group (pTAG) but to a secondary timing advance group (sTAG), any non-SSB-less SCell belonging to the same sTAG can be the default reference cell. Alternatively, the serving cell with the lowest / highest cell index can be the default reference cell.

[0288] To minimize system performance degradation due to SSB-less cell operation, SSB-less cell operation may not be allowed for PCell / PSCell / PUCCH-SCell (e.g., SCell on which PUCCH transmission is configured) / PUCCH-sSCell (e.g., SCell on which PUCCH transmission is enabled due to PUCCH cell switching) on ​​which PUCCH can be transmitted. In addition, for a similar purpose, SCells configured / designated as reference cells for SSB-less cells may not be allowed to be deactivated or operate in dormant BWP.

[0289] The terminal may be configured with some or all of the following information for on-demand SSB that can be transmitted on an SSB-less cell, and may be configured differently for each BWP configured in the SSB-less cell or commonly for all BWPs. Multiple candidate values ​​may be defined / configured in advance for one of the following pieces of information, and one of the values ​​may be configured / indicated via RRC signaling for configuring / adding an SSB-less cell or MAC-CE (for SCell activation).

[0290] - Period of on-demand SSB: This may mean the (minimum) time interval at which the same SSB (candidate) index is transmitted. If the period is not set, a default value (e.g., 20 msec) may be predefined, or the SSB period set in the reference cell may be applied as the period of on-demand SSB on the SSB-less cell.

[0291] - Transmission duration of on-demand SSB: The transmission duration can mean the period from when on-demand SSB starts to when it ends on an SSB-less cell. For example, when on-demand SSB is transmitted P times with a cycle of X msec starting from slot #n on an SSB-less cell, and SSB is no longer transmitted and can be turned off from slot #n+k, then k slots (or the absolute time corresponding to k slots or P) can be defined as the period.

[0292] - Pattern information of on-demand SSB: If the time / frequency structure between legacy SSB and on-demand SSB may be different, information about the pattern of such compressed / simplified SSB may be set.

[0293] - Power value of on-demand SSB: If path loss estimation, CSI reporting, etc. need to be performed via the SSB, the power value of the SSB may be required. If the power value is not set, the predefined default value is applied, or the SSB power value set in the GTT cell can be increased and applied. In addition, if the relative EPRE value between PSS / SSS / PBCH can be different from the existing SSB, the relative EPRE value can also be additionally set.

[0294] - Location of frequency resources (e.g. center frequency) where on-demand SSB is transmitted

[0295] - Information on whether the on-demand SSB is a NCD-SSB (non-cell defining-SSB) or CD-SSB (cell defining-SSB).

[0296] If multiple reference cells can be set for an SSB-less cell, the aforementioned information corresponding to each reference cell can be set separately.

[0297] Additionally, the above-described information can also be set for SSB transmitted for a certain time T after SCell activation, as in the above-described embodiment 1.

[0298] Figure 8 illustrates an on-demand SSB related procedure applicable to the present disclosure.

[0299] Referring to FIG. 8, the base station can set up an SSB-less cell, a reference cell, and / or an on-demand SSB, etc. based on the methods described above in the present disclosure (S810).

[0300] After performing timing information and / or path loss estimation based on the reference cell (S820), the terminal may select and transmit one of the configured on-demand SSB signals (S830). Here, the on-demand SSB signal may refer to a UL signal / channel for requesting on-demand SSB.

[0301] After receiving the on-demand SSB signal, the base station can transmit a corresponding SSB signal (S840).

[0302] FIG. 9 and FIG. 10 illustrate terminal operations and base station operations for performing measurements in consideration of on-demand SSB according to embodiments of the present disclosure described above.

[0303] FIG. 9 is a diagram for explaining the operation of a terminal according to one embodiment of the present disclosure.

[0304] The terminal can transmit first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurement to the base station (S910).

[0305] Here, the first time interval may collectively refer to a time window in which the terminal can measure on-demand SSB, and may also be expressed as a first period or a first time interval, etc. For example, the first configuration information may include at least one of the number of a plurality of first time intervals, the interval between each of the plurality of first time intervals, or the length of each of the plurality of first time intervals.

[0306] In addition, the terminal may receive the first configuration information from the base station through a system information block or a radio resource control (RRC) message, but is not limited thereto.

[0307] The terminal can perform measurement for at least one on-demand SSB within at least one first time period among a plurality of first time periods (S920).

[0308] Specifically, the terminal can transmit an uplink channel (e.g., a (physical) random access channel, etc.) to the base station to request transmission of an on-demand SSB. The terminal can receive at least one on-demand SSB from the base station based on the uplink channel. The terminal can perform a measurement operation for at least one on-demand SSB within at least one first time interval among a plurality of first time intervals set by the first configuration information.

[0309] Here, at least one first time interval may include a time interval after a reference time interval from a reference point in time among a plurality of first time intervals. That is, the terminal may perform measurements for on-demand SSB only within at least one first time interval after a reference time interval from a reference point in time among a plurality of first time intervals.

[0310] The reference time interval can be predefined or set by the base station. Configuration information for the reference time interval can be transmitted from the base station to the terminal along with the first configuration information, but is not limited thereto. The terminal can receive configuration information for the reference time interval from the base station through separate higher-layer signaling (e.g., SIB, RRC message, etc.).

[0311] For example, if a point in time after a reference time interval overlaps with a specific first time interval based on a reference time point, the specific first time interval may also be included in at least one first time interval in which measurement for on-demand SSB can be performed. That is, the terminal may perform measurement for on-demand SSB during a time after a point in time after the reference time interval based on the reference time point among the specific first time intervals. However, this is only one embodiment, and the terminal may perform measurement for on-demand SSB within the first time interval(s) after the specific first time interval.

[0312] Here, the reference point in time may be i) the point in time of requesting on-demand SSB transmission or ii) the point in time of receiving control information related to on-demand SSB.

[0313] The on-demand SSB transmission request time may include the time when the terminal transmits the uplink channel to request on-demand SSB transmission or the time when the base station receives the uplink channel.

[0314] For example, control information related to on-demand SSB may include at least one of control information including information related to the start of on-demand SSB transmission, control information related to a measurement instruction for on-demand SSB, or control information related to an instruction for reporting on-demand SSB measurement results.

[0315] For example, before receiving an on-demand SSB, the terminal may receive control information related to the on-demand SSB, which includes information regarding the start of the on-demand SSB transmission. The terminal may confirm that the on-demand SSB is being transmitted from the base station through the control information. The control information including information regarding the start of the on-demand SSB transmission may include information regarding whether the on-demand SSB transmission has started and information regarding the start of the on-demand SSB transmission.

[0316] Additionally or alternatively, the terminal may perform a measurement operation for the on-demand SSB after receiving control information related to a measurement instruction for the on-demand SSB.

[0317] In addition, control information related to on-demand SSB can be transmitted from the base station to the terminal via downlink control information (DCI), medium access control (MAC) control element (CE), or RRC message.

[0318] As an example of the present disclosure, a terminal may receive a signal related to the suspension of SSB measurement from a base station and may stop the SSB measurement operation based on the signal. The signal may be transmitted from the base station to the terminal via at least one of an RRC message, MAC CE, and DCI.

[0319] The terminal can transmit the results of measurement for at least one on-demand SSB to the base station (S930).

[0320] As an example of the present disclosure, a terminal may receive second configuration information related to reporting of measurement results for at least one on-demand SSB from a base station. For example, the terminal may receive, but is not limited to, upper layer signaling (e.g., SIB, RRC message, etc.) from the base station that includes the first configuration information and the second configuration information. The terminal may receive the second configuration information from the base station through separate upper layer signaling.

[0321] For example, the second configuration information may include at least one of at least one second time interval for reporting measurement results (e.g., measurement results for on-demand SSB), a length of the at least one second time interval, or an interval of each of the at least one second time interval.

[0322] Additionally or alternatively, the terminal may receive control information related to an instruction for reporting on-demand SSB measurement results from the base station (e.g., information on a second time interval for reporting on-demand SSB measurement results among at least one second time interval, information indicating to report on-demand SSB measurement, etc.).

[0323] The terminal may transmit the measurement results to the base station during at least one second time period via control information related to the second configuration information and / or an instruction for reporting on-demand SSB measurement results.

[0324] As an example of the present disclosure, based on the measurement value of at least one on-demand SSB being greater than or equal to a first threshold, the length of at least one second time interval for which the terminal reports the measurement result may be a first value. Based on the measurement value of at least one on-demand SSB being less than the first threshold, the length of at least one second time interval for which the terminal reports the measurement result may be a second value. Here, the first value may be greater than the second value, but is not limited thereto. The first value may be less than the second value.

[0325] Additionally, information related to the first value, the second value, or / and the first threshold value may be included in the second setting information or set through separate setting information, but may also be predefined.

[0326] In another example of the present disclosure, based on an event triggered related to measurement of at least one on-demand SSB (e.g., based on a condition associated with the event being satisfied), the terminal may transmit the results of the measurement of at least one on-demand SSB to the base station. That is, the terminal may perform an event-triggered reporting operation related to the measurement results of the on-demand SSB.

[0327] The method described in the example of FIG. 9 can be performed by the first device (100) of FIG. 11. For example, one or more processors (102) of the first device (100) of FIG. 11 can receive first configuration information related to a plurality of first time periods for on-demand SSB measurements from a base station through one or more transceivers (106). The one or more processors (102) can perform measurements for at least one on-demand SSB within at least one first time period among the plurality of first time periods. The one or more processors (102) can transmit the results of the measurements for the at least one on-demand SSB to the base station through one or more transceivers (106).

[0328] Furthermore, one or more memories (104) of the first device (100) may store commands for performing the method described in the example of FIG. 11 or the examples described below when executed by one or more processors (102).

[0329] FIG. 10 is a diagram for explaining the operation of a base station according to one embodiment of the present disclosure.

[0330] The base station can transmit first configuration information related to a plurality of first time periods for on-demand SSB measurement to the terminal (S1010).

[0331] Specifically, the base station may transmit first configuration information related to a time period for performing measurement operations for on-demand SSB to the terminal via upper layer signaling. The configuration of the first configuration information has been described with reference to FIG. 9, so a redundant description will be omitted.

[0332] The base station can transmit at least one on-demand SSB to the terminal (S1020).

[0333] Specifically, the base station can receive an uplink channel for an on-demand SSB request from a terminal. The terminal can transmit at least one on-demand SSB in response to the uplink channel.

[0334] The base station can receive the results of measurement for at least one on-demand SSB from the terminal (S1030).

[0335] For example, the base station may transmit control information related to measurement for at least one on-demand SSB and / or control information related to reporting of measurement results for at least one on-demand SSB to the terminal. The base station may receive the results of measurement for at least one on-demand SSB from the terminal during a set time period.

[0336] The method described in the example of FIG. 10 can be performed by the second device (200) of FIG. 11. For example, one or more processors (202) of the second device (200) of FIG. 11 can transmit first configuration information related to a plurality of first time periods for on-demand SSB measurements to the terminal via one or more transceivers (202). The one or more processors (202) can receive at least one on-demand SSB from the terminal via one or more transceivers (206). The one or more processors (202) can receive the results of the measurement for at least one on-demand SSB from the terminal via one or more transceivers (206).

[0337] Furthermore, one or more memories (204) of the second device (200) may store instructions for performing the method described in the example of FIG. 10 or the examples described below when executed by one or more processors (202).

[0338] General devices to which the present disclosure may be applied

[0339] FIG. 11 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.

[0340] Referring to FIG. 11, the first device (100) and the second device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G).

[0341] A first device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present disclosure.

[0342] For example, the processor (102) may process information in the memory (104) to generate first information / signal and then transmit a wireless signal including the first information / signal through the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal through the transceiver (106) and then store information obtained from signal processing of the second information / signal in the memory (104).

[0343] The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts 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 a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may 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 used interchangeably with an RF (Radio Frequency) unit. In the present disclosure, a device may also mean a communication modem / circuit / chip.

[0344] The second device (200) includes one or more processors (202), 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 memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present disclosure. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). In addition, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts 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 a wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may 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 used interchangeably with an RF unit. In the present disclosure, a device may also mean a communication modem / circuit / chip.

[0345] Hereinafter, the hardware elements of the device (100, 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, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in the present disclosure, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in the present disclosure.

[0346] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this disclosure may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this disclosure may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0347] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0348] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts 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., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of the present disclosure, from one or more other devices. For example, one or more transceivers (106, 206) can 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. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled 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, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts 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) can convert received user data, control information, 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 by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0349] The embodiments described above are combinations of components and features of the present disclosure in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form embodiments of the present disclosure by combining some components and / or features. 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 another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form embodiments or incorporated as new claims through post-application amendments.

[0350] It will be apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential characteristics thereof. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present disclosure are intended to be included within the scope of the present disclosure.

[0351] The scope of the present disclosure includes software or machine-executable instructions (e.g., an operating system, an application, firmware, a program, etc.) that cause operations according to the methods of various embodiments to be executed on a device or a computer, and a non-transitory computer-readable medium having such software or instructions stored thereon and executable on the device or computer. Instructions that can be used to program a processing system to perform the features described in the present disclosure can be stored on / in a storage medium or a computer-readable storage medium, and a computer program product including such a storage medium can be used to implement the features described in the present disclosure. 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 optionally includes one or more storage devices remotely located from the processor(s). The memory or, alternatively, the non-volatile memory device(s) within the memory comprise a non-transitory computer-readable storage medium. The features described in this disclosure may be incorporated into software and / or firmware stored on any of the machine-readable media, which may control the hardware of the processing system and allow the processing system to interact with other mechanisms that utilize results according to embodiments of the present disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0352] Here, the wireless communication technology implemented in the device (100, 200) of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented with standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the device (100, 200) of the present disclosure may perform communication based on LTE-M technology. At this time, for example, 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, LTE-M technology can be implemented by at least 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-described names. Additionally or alternatively, the wireless communication technology implemented in the device (100, 200) of the present disclosure can include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names. For example, ZigBee technology can create personal area networks (PAN) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

[0353] The method proposed in this disclosure is explained with a focus on examples applied to 3GPP LTE / LTE-A, 5G, and 6G systems, but can be applied to various wireless communication systems in addition to 3GPP LTE / LTE-A, 5G, and 6G systems.

Claims

1. A step of receiving, by a terminal, first configuration information related to a plurality of first time periods for on-demand synchronization signal block (SSB) measurement from a base station; A step of performing, by the terminal, a measurement for at least one on-demand SSB within at least one first time period among the plurality of first time periods; and A step of transmitting the result of measurement for at least one on-demand SSB to the base station by the terminal, Each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, The above reference point is, i) the point in time of requesting on-demand SSB transmission or ii) the point in time of receiving control information related to on-demand SSB.

2. In paragraph 1, A method wherein the first setting information includes at least one of the number of the plurality of first time intervals, the interval between each of the plurality of first time intervals, or the length of each of the plurality of first time intervals.

3. In paragraph 1, A method in which the above first setting information is transmitted to the terminal via a system information block or a radio resource control (RRC) message.

4. In paragraph 1, The above reference time interval is a method that is predefined or set by the base station.

5. In paragraph 1, Second configuration information related to reporting of measurement results for at least one on-demand SSB is transmitted from the base station to the terminal, A method according to claim 1, wherein the second setting information comprises at least one of: at least one second time interval for reporting the measurement result, the length of the at least one second time interval, or the interval of each of the at least one second time interval.

6. In paragraph 1, A method in which control information related to the above-described on-demand SSB is transmitted to the terminal via downlink control information, a medium access control (MAC) control element (CE), or an RRC message.

7. In paragraph 1, A method wherein the control information related to the on-demand SSB comprises at least one of control information including information related to the start of the on-demand SSB transmission, control information related to a measurement instruction for the on-demand SSB, or control information related to an instruction for reporting the on-demand SSB measurement results.

8. In paragraph 7, A method wherein control information including information related to the start of the on-demand SSB transmission includes information related to whether the on-demand SSB transmission is started and information related to the start of the on-demand SSB transmission.

9. In paragraph 5, Based on the measurement value of at least one on-demand SSB being greater than or equal to a first threshold value, the length of the at least one second time interval is a first value, Based on the measurement value of at least one on-demand SSB being less than the first threshold value, the length of the at least one second time interval is a second value, A method wherein the first value is greater than the second value.

10. In paragraph 1, A method wherein a result of a measurement for the at least one on-demand SSB is transmitted to the base station based on an event related to measurement for the at least one on-demand SSB being triggered.

11. In the terminal, the terminal: one or more transceivers; and comprising one or more processors connected to said one or more transceivers, One or more of the above processors: Receive first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurements from a base station through the one or more transceivers; Performing a measurement for at least one on-demand SSB within at least one first time interval among the plurality of first time intervals; and The result of the measurement for the at least one on-demand SSB is set to be transmitted to the base station through the one or more transceivers, Each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, The above reference point is a terminal, i) when an on-demand SSB transmission request is made or ii) when control information related to on-demand SSB is received.

12. A step of transmitting first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurement to a terminal by a base station; a step of transmitting at least one on-demand SSB to the terminal by the base station; and A step of receiving the result of measurement for at least one on-demand SSB from the terminal by the base station, A measurement operation for the at least one on-demand SSB is performed within at least one first time period among the plurality of first time periods, Each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, The above reference point is, i) the time of requesting on-demand SSB transmission or ii) the time of receiving control information related to on-demand SSB.

13. In the base station, the base station: one or more transceivers; and comprising one or more processors connected to said one or more transceivers, One or more of the above processors: Transmitting first configuration information related to a plurality of first time intervals for on-demand synchronization signal block (SSB) measurement to a terminal via the one or more transceivers; Transmitting at least one on-demand SSB to the terminal via the one or more transceivers; and The result of the measurement for the at least one on-demand SSB is set to be received from the terminal through the one or more transceivers, A measurement operation for the at least one on-demand SSB is performed within at least one first time period among the plurality of first time periods, Each of the at least one first time interval is a time interval after a reference time interval from a reference time point among the plurality of first time intervals, The above reference point is a device, i) a point in time when an on-demand SSB transmission request is made or ii) a point in time when control information related to on-demand SSB is received.

14. In a processing device configured to control a station (STA) in a wireless local area network (WLAN) system, the processing device: one or more processors; and A processing device comprising one or more computer memories operatively connected to said one or more processors and storing instructions that, when executed by said one or more processors, perform a method according to any one of claims 1 to 10.

15. One or more non-transitory computer-readable media storing one or more instructions, A computer-readable medium, wherein the one or more commands are executed by one or more processors to control a device in a wireless LAN system to perform a method according to any one of claims 1 to 10.

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