Method and apparatus for transmitting and receiving signals in wireless communication system

Abstract

Disclosed are a method and apparatus for transmitting and receiving signals in a wireless communication system. The method according to an embodiment of the present disclosure may comprise the steps of: receiving first downlink control information (DCI) including information related to whether a transmission mode based on a plurality of transmission configuration indicator (TCI) states is scheduled; additionally receiving second DCI on the basis of the transmission mode being scheduled; and carrying out downlink reception or uplink transmission based on the transmission mode. In this case, a portion of scheduling information for the transmission mode may be included in the first DCI, and the remaining portion may be included in the second DCI.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving signals 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 transmitting and receiving a signal in a wireless communication system.

[0005] The technical problem of the present disclosure is to provide a method and apparatus for performing scheduling based on 2-stage DCI in transmission and reception of signals based on a plurality of transmission and reception points (TRPs) in a wireless communication system.

[0006] 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 can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0007] A method according to one aspect of the present disclosure may include the steps of: receiving a first downlink control information (DCI) including information related to whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; additionally receiving a second DCI based on whether the transmission mode is scheduled; and performing downlink reception or uplink transmission based on the transmission mode. Here, a portion of the scheduling information for the transmission mode may be included in the first DCI, and the remaining portion may be included in the second DCI.

[0008] A method according to an additional aspect of the present disclosure may include: transmitting a first downlink control information (DCI) including information related to whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; additionally transmitting a second DCI based on the transmission mode being scheduled; and performing downlink transmission or uplink reception based on the transmission mode. Here, a portion of the scheduling information for the transmission mode may be included in the first DCI, and the remaining portion may be included in the second DCI.

[0009] According to various embodiments of the present disclosure, a method and apparatus for transmitting and receiving signals in a wireless communication system can be provided.

[0010] According to various embodiments of the present disclosure, a method and apparatus for performing 2-stage DCI-based scheduling in transmission and reception of signals based on multiple transmission and reception points (TRPs) in a wireless communication system can be provided.

[0011] According to various embodiments of the present disclosure, the DCI overhead can be reduced as the single TRP scheduling ratio of the base station is higher than the multiple TRP scheduling ratio and as the number of multiple TRPs increases.

[0012] 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.

[0013] 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.

[0014] Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0015] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0016] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

[0017] FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.

[0018] FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

[0019] 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.

[0020] Figure 7 illustrates a general functional architecture related to functionality-based LCM and model-based LCM.

[0021] Figure 8 illustrates signaling operations for procedures related to AI / ML.

[0022] FIG. 9 illustrates a multi-TRP (Transmission and Reception Point) transmission method in a wireless communication system to which the present disclosure can be applied.

[0023] FIG. 10 is a drawing for explaining the operation of the first device according to an embodiment of the present disclosure.

[0024] FIG. 11 is a drawing for explaining the operation of a second device according to an embodiment of the present disclosure.

[0025] FIG. 12 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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).

[0038] 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).

[0039] Abbreviations for terms that may be used in this disclosure are defined as follows.

[0040] - BM: beam management

[0041] - CQI: Channel Quality Indicator

[0042] - CRI: Channel state information - reference signal resource indicator

[0043] - CSI: Channel State Information

[0044] - CSI-IM: Channel State Information - Interference Measurement

[0045] - CSI-RS: Channel state information - reference signal

[0046] - DMRS: Demodulation Reference Signal

[0047] - FDM: frequency division multiplexing

[0048] - FFT: fast Fourier transform

[0049] - IFDMA: interleaved frequency division multiple access

[0050] - IFFT: inverse fast Fourier transform

[0051] - L1-RSRP: Layer 1 reference signal received power

[0052] - L1-RSRQ: Layer 1 reference signal received quality

[0053] - MAC: Medium Access Control

[0054] - NZP: non-zero power

[0055] - OFDM: orthogonal frequency division multiplexing

[0056] - PDCCH: Physical downlink control channel

[0057] - PDSCH: Physical downlink shared channel

[0058] - PMI: precoding matrix indicator

[0059] - RE: resource element

[0060] - RI: Rank indicator

[0061] - RRC: Radio Resource Control

[0062] - RSSI: Received signal strength indicator

[0063] - Rx: Reception

[0064] - QCL: quasi co-location

[0065] - SINR: signal to interference and noise ratio

[0066] - SSB (or SS / PBCH block): Synchronization signal block (including primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH))

[0067] - TDM: Time Division Multiplexing

[0068] - TRP: transmission and reception point

[0069] - TRS: Tracking Reference Signal

[0070] - Tx: transmission

[0071] - UE: user equipment

[0072] - ZP: Zero Power

[0073] System General

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0080] 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.

[0081] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0082] 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.

[0083] 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.

[0084] μΔf=2 μ ·15 [kHz]CP015 Normal 130 Normal 260 Normal, Extended 3120 Normal 4240 Normal

[0085] Next-generation RAT systems support multiple numerologies (or subcarrier spacings (SCS)) to support various 5G / 6G services. For example, an SCS of 15 kHz supports a wide area in traditional cellular bands; an SCS of 30 kHz / 60 kHz supports dense-urban, lower latency, and wider carrier bandwidth; and an SCS of 60 kHz or higher supports a bandwidth greater than 24.25 GHz to overcome phase noise. Although not described in Table 1, an SCS of 480 kHz / 960 kHz may be additionally supported for 6G systems.

[0086] The frequency bands of next-generation RAT systems are defined by various types of frequency ranges (e.g., FR1, FR2, etc.). For example, FR1 and FR2 can be configured as shown in Table 2 below. Additionally, FR2 can refer to millimeter wave (mmW).

[0087] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing FR1410MHz - 7125MHz 15, 30, 60kHz FR224250MHz - 52600MHz 60, 120, 240kHz

[0088] 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 the uplink and one set of frames for the downlink.

[0089] Additionally, transmission at uplink frame number i from the 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.

[0090] 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.

[0091] μN symb slot N slot frame,μ N slot subframe,μ01410111420221440431480841416016

[0092] μN symb slot N slot frame,μ N slot subframe,μ212404

[0093] 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} slot 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.

[0094] Regarding physical resources in a next-generation RAT system, antenna ports, resource grids, resource elements, resource blocks, and carrier parts may be considered. Below, the physical resources that may be considered in a next-generation RAT system will be examined in detail.

[0095] 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.

[0096] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

[0097] 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 antenna port p. Each element of the resource grid for μ and antenna port p is referred to as a resource element and is uniquely identified by an index pair (k, l'), where 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.

[0098] Point A serves as a common reference point of the resource block grid and is obtained as follows.

[0099] - 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.

[0100] - absoluteFrequencyPointA represents the frequency-position of point A expressed as ARFCN (absolute radio-frequency channel number).

[0101] 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.

[0102]

[0103] 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 to 1, where i is the number of the 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.

[0104]

[0105] N BWP,i start,μ is a common resource block where BWP starts relative to common resource block 0.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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).

[0110] Meanwhile, a base station can configure multiple BWPs 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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).

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] Table 5 shows an example of DCI format in the next-generation RAT system.

[0123] 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

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] Quasi-Co Location (QCL)

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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:

[0136] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0137] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0138] - 'QCL-TypeC': {Doppler shift, average delay}

[0139] - 'QCL-TypeD': {Spatial Rx parameter}

[0140] 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.

[0141] 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'.

[0142] Artificial intelligence (AI) / machine learning (ML) related operations

[0143] AI / ML can be introduced / applied to the next-generation RAT system described in this disclosure.

[0144] Incorporating AI into communications can streamline and improve real-time data transmission. AI can use numerous analytics to determine how complex target tasks should be performed. This means AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handovers, network selection, and resource scheduling can be performed instantly using AI. AI can also play a crucial role in machine-to-machine (M2M), machine-to-human, and human-to-machine communications. Furthermore, AI can facilitate rapid communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-sustaining wireless networks, and machine learning.

[0145] Below, we describe a functional framework for AI / ML operations.

[0146] Below, to explain AI (or AI / ML) more specifically, the terms can be defined as follows.

[0147] - Data collection: Data collected from network nodes, management entities, or terminals as a basis for AI model training, data analysis, and inference.

[0148] - AI Model: A data-driven algorithm that applies AI technology to generate a set of outputs containing predictive information and / or decision parameters based on a set of inputs.

[0149] - AI / ML Training: An online or offline process of training an AI model by learning features and patterns that best represent the data and obtain a trained AI / ML model for inference.

[0150] - AI / ML Inference: The process of making predictions or inducing decisions based on collected data and the AI ​​model using a trained AI model.

[0151] Life Cycle Management (LCM) procedures for AI / ML models (i.e., model training, model deployment, model inference, model monitoring, model updates, etc.) can be divided into functionality-based LCM and model-based LCM. In functionality-based LCM, AI / ML models may not be identified by the network, and the network can direct the activation / deactivation / fallback / switching of AI / ML functionality. In model-ID (identifier)-based LCM, AI / ML models can be identified by the network, and the network / terminal can activate / deactivate / select / switch AI / ML models based on the model ID.

[0152] Figure 7 illustrates a general functional architecture relevant to both Functionality-based LCM and Model-based LCM. Some of the functions or some of the data / information / command flows (i.e., arrows) illustrated in Figure 7 may be omitted.

[0153] Referring to FIG. 7, a general functional framework can be configured to include a data collection function (10), a model training function (20), a management function (30), an inference function (40), and a model storage function (50).

[0154] The Data Collection function (10) is a function that provides input data to the Model Training function (20), Management function (30), and Inference function (40). The Data Collection function (10) can perform data preparation based on raw data and provide input data processed through data preparation. Examples of raw data may include received data / measurement data from terminals or other network entities, inference / output of AI / ML models, etc. The Data Collection function (10) may be performed by a single entity (e.g., terminal, network node, etc.) or may be performed by multiple entities.

[0155] Here, training data (11) refers to data required as input for the AI / ML Model Training function (20). Monitoring data (12) refers to data required as input for the Management (30) of the AI / ML model or AI / ML function. Inference data (13) refers to data required as input for the AI / ML Inference function (30).

[0156] The Model Training function (20) is a function that performs AI / ML model training, validation, and testing, which can generate model performance metrics that can be used as part of the AI / ML model testing procedure. The Model Training function (20) can perform data preparation (e.g., data pre-processing and cleaning, forming, and transformation) based on the Training Data (11) transferred from the Data Collection function (10), if necessary.

[0157] Trained / Updated Model (21): If there is a Model Storage function (50), it is used to pass a trained, validated and tested AI / ML model to the Model Storage function (50) or to pass an updated version of the model to the Model Storage function (50).

[0158] The Management function (30) is a function that supervises the operation of the AI / ML model or AI / ML function. In addition, the Management function (30) may perform decisions to ensure appropriate inference operations based on data received from the Data Collection function (10) (i.e., Monitoring Data (12)) and / or data received from the Inference function (40) (i.e., Inference Output (41)).

[0159] Management Instruction (32) is information required as input to manage the Inference function (40). The relevant information may include selection / (de)activation / switching of an AI / ML model or AI / ML-based function, and may also include fallback to non-AI / ML operations (i.e., not relying on the inference process).

[0160] A Model Transfer / Delivery Request (33) can be used to request model(s) from Model Storage (50).

[0161] A Performance Feedback / Retraining Request (31) refers to information required as input to the Model Training function (20) (e.g., for the purpose of (re)training or updating the model).

[0162] The Inference function (40) is a function that provides output from the process of applying an AI / ML model or AI / ML function using data (i.e., Inference Data (13)) provided by Data Collection (10) as input. Data preparation (e.g., data preprocessing and cleaning, formatting, and transformation) may also be performed based on the Inference Data (13) delivered by Data Collection (10). If necessary, the Inference function (40) may also perform data preparation (e.g., data preprocessing and cleaning, forming, and transformation) based on the Inference Data (13) provided by Data Collection function (10).

[0163] Inference Output (41) is data used in the Management function (30) to monitor the performance of an AI / ML model or AI / ML function. Inference Output (41) may include the inference output of the AI / ML model generated by the Inference function (30), and the details of the inference output may vary depending on the use case.

[0164] The Model Storage function (50) stores a learned / updated model that can be used to perform the Inference function (40). The Model Storage function (50) illustrated in FIG. 7 can be used as a reference point (if any) when applicable to protocol termination, model transmission / delivery, and related processes. Furthermore, the Model Storage function (50) is merely an example and is not intended to limit the storage location of actual AI / ML models, and may be omitted.

[0165] Model Transfer / Delivery (51) is used to transfer AI / ML models to inference functions.

[0166] The level of cooperation can be defined as follows depending on the capability of AI / ML functions between multiple nodes, and variations due to combination of multiple levels or separation of any one level are also possible.

[0167] Cat 0a) No collaboration framework: AI / ML algorithms are purely implementation-based and do not require any changes to the wireless interface.

[0168] Cat 0b) This level corresponds to a framework with a modified wireless interface tailored to efficient implementation-based AI / ML algorithms, but without collaboration.

[0169] Category 1) involves inter-node support to improve the AI / ML algorithms of each node. For example, this applies when a specific node receives support from another node (for training, adaptation, etc.) and vice versa. At this level, model exchange between network nodes is not required.

[0170] Category 2) Joint AI / ML tasks can be performed across multiple nodes. This level requires the exchange of AI / ML model commands or network nodes.

[0171] FIG. 7 is a diagram illustrating an overall functional framework for an AI / ML model, and not all functions and / or all data / information / command signals illustrated in FIG. 7 may be performed within a specific node, but only some of them may be performed.

[0172] AI / ML models can be divided into one-side models and two-side models depending on whether training and / or inference are performed on a single node or jointly / sequentially on multiple nodes.

[0173] A one-side model can refer to an AI / ML model in which inference is performed entirely by a single node (e.g., a terminal or network). Here, AI / ML model training can also be performed entirely by a single node. AI / ML model training and inference can be performed by the same node, or they can be performed by separate nodes.

[0174] A two-side model can refer to an AI / ML model in which joint inference is performed across multiple nodes (e.g., terminals and networks). Joint inference refers to inference being performed jointly across multiple nodes. For example, the first part of the inference may be performed by a first node, and the remaining part by a second node. Two-side models can be categorized into several types depending on the training method of the AI / ML model, as follows:

[0175] - First type: AI / ML models can be trained on a single node. In this case, joint training can be performed. The trained model can then be distributed to other nodes / objects.

[0176] - Second type: Joint training of AI / ML models can be performed on multiple nodes / entities (e.g., networks and terminals). Joint training can mean that model generation (e.g., CSI generation part) and model reconstruction (CSI compression by sub-use case) are trained in the same loop for forward activation and backward gradient. In this type, joint training can include both simultaneous training (i.e., model generation training and model reconstruction training are performed simultaneously) and sequential training (i.e., model reconstruction training is performed after model generation training).

[0177] - Third type: Separate training of AI / ML models can be performed on multiple nodes (e.g., networks and terminals). Separate training may mean that training begins sequentially on one node and continues on other nodes. In this case, the first node first performs the AI / ML model and shares the training data with the second node. The second node can then use the shared training data to perform the AI / ML model. For example, training for the CSI generation part may be performed by the terminal, while CSI reconstruction may be performed by the network.

[0178] The operations described in the present disclosure described below can be explained / interpreted based on the AI / ML model as shown in Fig. 8 below, even without separate mention (i.e., without explicit mention of being by / based on / for the AI / ML model).

[0179] Additionally, unless specifically limited in the description of the present disclosure, the AI / ML model may correspond to a one-side model in which inference is entirely performed by one node or a two-side model in which joint inference is performed by multiple nodes.

[0180] Step 1: In the description of the present disclosure described below, signaling (e.g., information / data / channel / signal, etc.) or a set of signaling between a specific node (e.g., a terminal, a network, etc.) and another node may be interpreted as the signaling or set of signaling of Step 1 used to perform an operation based on an AI / ML model, even if not otherwise mentioned. For example, it may correspond to training data for training (i.e., generation and / or reconstruction) the AI / ML model of FIG. 7, or correspond to inference data used for inference of the AI / ML model, or correspond to feedback for the AI / ML model, etc. If signaling between nodes is not required prior to an operation based on an AI / ML model in the present disclosure, Step 1 may be omitted. If a one-side model is used in the present disclosure, the unidirectional / bidirectional signaling (set) in the present disclosure may correspond to the signaling of Step 1. In addition, when a two-side model is used in the present disclosure, the one-way / two-way signaling in the present disclosure may correspond to one-stage signaling, and also, a repetitive signaling operation may correspond to one-stage signaling.

[0181] For example, in AI / ML model-based beam management (BM), if a base station predicts (i.e., infers) beam(s) with good quality based on an AI / ML model, the base station can receive quality / intensity information for multiple beams from a terminal. Furthermore, if a terminal predicts (i.e., infers) beam(s) with good quality based on an AI / ML model, the terminal can receive multiple beams from the base station.

[0182] Step 2: In the description of the present disclosure described below, an operation (e.g., calculation, selection, prediction, etc.) in a specific node (e.g., terminal, network, etc.) or a joint operation (e.g., calculation, selection, prediction, etc.) in multiple nodes (e.g., terminal, network, etc.) may correspond to a step 2 operation based on one or more functions in the functional framework of the AI / ML model, even if not mentioned separately. For example, it may correspond to training (i.e., generation and / or reconstruction) of the AI / ML model in FIG. 7 or inference of the AI / ML model, etc. When a one-side model is used, an operation performed by a single node in the present disclosure may correspond to a step 2 operation, and also, when a two-side model is used, a joint operation performed by multiple nodes in the present disclosure may correspond to a step 2 operation.

[0183] For example, in an AI / ML model-based BM, the base station can use quality / intensity information for multiple beams received from the terminal as inference data to predict (i.e., infer) beam(s) with good quality based on the AI / ML model. Furthermore, the terminal can measure multiple beams received from the base station and use the measurement results as inference data to predict (i.e., infer) beam(s) with good quality based on the AI / ML model.

[0184] Step 3: In the description of the present disclosure described below, the signaling (e.g., information / data / channel / signal, etc.) or set of signaling between a specific node (e.g., terminal, network, etc.) and another node may be interpreted as a three-step signaling or set of signaling generated due to (as a result of) an operation based on an AI / ML model, even if not otherwise mentioned. For example, it may correspond to an output resulting from inference of the AI / ML model in FIG. 7. If signaling between nodes is not required as a result of an operation based on an AI / ML model in the present disclosure, Step 3 may be omitted. If a one-side model is used in the present disclosure, the one-way / two-way signaling (set) in the present disclosure may correspond to the three-step signaling. In addition, if a two-side model is used in the present disclosure, the one-way / two-way signaling in the present disclosure may correspond to the three-step signaling, and furthermore, a repetitive signaling operation may correspond to the three-step signaling.

[0185] For example, in an AI / ML model-based BM, the base station can transmit to the terminal the beam(s) predicted based on the AI / ML model as candidates so that the terminal can determine the optimal beam. Furthermore, the terminal can report to the base station the beam(s) predicted based on the AI / ML model to request the base station to transmit the candidate beams as candidates for determining the optimal beam.

[0186] Actions related to multiple TRP (M-TRP)

[0187] FIG. 9 illustrates a multi-TRP transmission method in a wireless communication system to which the present disclosure can be applied.

[0188] Referring to Fig. 9(a), it shows a case where a layer group transmitting the same codeword (CW) / transport block (TB) corresponds to different TRPs. In this case, the layer group may refer to a predetermined layer set consisting of one or more layers. In this case, the amount of transmission resources increases due to the large number of layers, which has the advantage of enabling the use of robust channel coding with a low code rate for TB. In addition, since the channels are different from multiple TRPs, improved reliability of the received signal can be expected based on the diversity gain.

[0189] Referring to Fig. 9(b), an example of transmitting different CWs through layer groups corresponding to different TRPs is shown. At this time, it can be assumed that the TBs corresponding to CW #1 and CW #2 in the figure are the same. That is, CW #1 and CW #2 mean that the same TB is converted into different CWs through channel coding, etc. by different TRPs, respectively. Therefore, it can be viewed as an example of repeated transmission of the same TB. In the case of Fig. 9(b), compared to Fig. 9(a), there may be a disadvantage in that the code rate corresponding to the TB is high. However, it has an advantage in that the code rate can be adjusted or the modulation order of each CW can be adjusted by indicating different RV (redundancy version) values ​​for encoded bits generated from the same TB depending on the channel environment.

[0190] According to the method exemplified in Figures 9(a) and 9(b), the same TB is repeatedly transmitted through different layer groups, and since each layer group is transmitted by a different TRP / panel, the data reception probability of the terminal can be increased. This is referred to as an SDM (Spatial Division Multiplexing)-based M-TRP URLLC transmission method. Layers belonging to different layer groups are transmitted through DMRS ports belonging to different DMRS CDM groups.

[0191] In addition, although the above-described multiple TRP related content was explained based on the SDM (spatial division multiplexing) method using different layers, it can be extended and applied to the FDM (frequency division multiplexing) method based on different frequency domain resources (e.g., RB / PRB (set) etc.) and / or the TDM (time division multiplexing) method based on different time domain resources (e.g., slots, symbols, sub-symbols etc.).

[0192] Regarding the techniques for multi-TRP based URLLC scheduled by a single DCI, the following techniques are being discussed.

[0193] 1) Technique 1 (SDM): Time and frequency resource allocation overlap, and n (n<=Ns) TCI states within a single slot.

[0194] 1-a) Technique 1a

[0195] - At each transmission occasion, the same TB is transmitted in one layer or set of layers, and each layer or set of layers is associated with one TCI and one set of DMRS port(s).

[0196] - A single codeword with a single RV is used across all spatial layers or across a set of layers. From the UE perspective, different coded bits are mapped to different layers or sets of layers using the same mapping rule.

[0197] 1-b) Technique 1b

[0198] - At each transmission occasion, the same TB is transmitted in one layer or set of layers, and each layer or set of layers is associated with one TCI and one set of DMRS port(s).

[0199] - A single codeword with one RV is used for each spatial layer or set of layers. The RV(s) corresponding to each spatial layer or set of layers may be the same or different.

[0200] 1-c) Technique 1c

[0201] - At one transmission occasion, the same TB having one DMRS port associated with multiple TCI state indices is transmitted in one layer, or the same TB having multiple DMRS ports that are one-to-one associated with multiple TCI state indices is transmitted in one layer.

[0202] For techniques 1a and 1c above, the same MCS is applied to all layers or a set of all layers.

[0203] 2) Technique 2 (FDM): Frequency resource allocation does not overlap, and there are n (n<=Nf) TCI states in a single slot.

[0204] - Each non-overlapping frequency resource allocation is associated with one TCI state.

[0205] - The same single / multiple DMRS port(s) are associated with all non-overlapping frequency resource allocations.

[0206] 2-a) Technique 2a

[0207] - A single codeword with a single RV is used for all resource allocations. From the UE perspective, common RB matching (mapping of codewords to layers) is applied to all resource allocations.

[0208] 2-b) Technique 2b

[0209] - A single codeword with a single RV is used for each non-overlapping frequency resource allocation. The RVs corresponding to each non-overlapping frequency resource allocation may be the same or different.

[0210] As for technique 2a above, the same MCS is applied to all non-overlapping frequency resource allocations.

[0211] 3) Technique 3 (TDM): Time resource allocation does not overlap, and n (n<=Nt1) TCI states within a single slot.

[0212] - Each transmission occasion of a TB has one TCI and one RV with a time granularity of mini-slots.

[0213] - A common MCS is used for all transmission occasions within a slot, either single or multiple DMRS port(s).

[0214] - RV / TCI can be the same or different at different transmission occasions.

[0215] 4) Technique 4 (TDM): n (n<=Nt2) TCI states in K (n<=K) different slots

[0216] - Each transmission occasion of TB has one TCI and one RV.

[0217] - All transmission occasions across K slots use a common MCS to single or multiple DMRS port(s).

[0218] - RV / TCI can be the same or different at different transmission occasions.

[0219] Downlink multi-TRP (M-TRP) URLLC transmission operation

[0220] DL M-TRP URLLC transmission method refers to a method in which multiple TRPs transmit the same data / DCI using different space (e.g., layer / port) / time / frequency resources. For example, TRP 1 can transmit specific data / DCI in resource 1, and TRP 2 can transmit the specific data / DCI (i.e., the same data / DCI) in resource 2.

[0221] That is, when the DL M-TRP URLLC transmission method is set, the terminal can receive the same data / DCI using different space / time / frequency resources. At this time, the terminal can receive an indication from the base station regarding the QCL RS / type (i.e., DL TCI state) used in the space / time / frequency resources for receiving the corresponding data / DCI.

[0222] For example, if the corresponding data / DCI is received from resource 1 and resource 2, the terminal can be instructed by the base station about the DL TCI state used in resource 1 and the DL TCI state used in resource 2. By receiving the corresponding data / DCI through resource 1 and resource 2, high reliability can be achieved. This M-TRP URLLC transmission method can be applied to PDSCH / PDCCH.

[0223] UL M-TRP URLLC transmission method refers to a method in which multiple TRPs receive the same data / UCI from a terminal using different space / time / frequency resources. For example, TRP 1 can receive the same data / UCI from a terminal on resource 1, and TRP 2 can receive the same data / UCI from a terminal on resource 2. In addition, TRP 1 and TRP 2 can share the data / UCI received from the terminal through a backhaul link (connected between TRPs).

[0224] That is, when the UL M-TRP URLLC transmission method is set, the terminal can transmit the same data / UCI to each TRP using different space / time / frequency resources. At this time, the terminal can be instructed by the base station about the Tx beam and Tx power (i.e., UL TCI state) to be used in the space / time / frequency resources for transmitting the same data / UCI. For example, when the same data / UCI is transmitted in resource 1 and resource 2, the terminal can be instructed by the base station about the UL TCI state used in resource 1 and the UL TCI state used in resource 2. This UL M-TRP URLLC can be applied to PUSCH / PUCCH.

[0225] In addition, in describing the present disclosure, when receiving / transmitting data / DCI / UCI through specific space / time / frequency resources, using (or mapping) a specific TCI state (or TCI) may mean, in the case of DL, estimating a channel from a DMRS using a QCL type and QCL RS indicated by the specific TCI state in the specific space / time / frequency resources, and receiving / demodulating data / DCI / UCI with the estimated channel.

[0226] And, when receiving / transmitting data / DCI / UCI through specific space / time / frequency resources, using (or mapping) a specific TCI state (or TCI) may mean, in the case of UL, transmitting / modulating DMRS and data / UCI using a Tx beam and / or Tx power indicated by a specific TCI state in a specific space / time / frequency resource.

[0227] In addition, the UL TCI state may include Tx beam or Tx power information of the terminal. In addition, the base station may set other parameters, such as spatial relation information, for the terminal instead of the TCI state.

[0228] For example, the UL TCI state can be directly indicated to the UE via the UL grant DCI. Alternatively, the UL TCI state can mean spatial relationship information of SRS resources indicated via the SRI (SRS resource indicator) field of the UL grant DCI. Alternatively, the UL TCI state can mean an open loop (OP) Tx power control parameter linked to a value indicated via the SRI field of the UL grant DCI.

[0229] Here, the OL Tx power control parameters may include, for example, j (index for OP parameter(s) Po and alpha (set of up to 32 parameter values ​​per cell), q_d (index of DL RS resources for path loss (PL) measurement (up to 4 measurements per cell), or / and I (closed-loop power control process index (up to 2 processes per cell)).

[0230] In another embodiment of the present disclosure, the M-TRP eMBB transmission method refers to a method in which M-TRP transmits different data / DCI using different space / time / frequency resources. When the M-TRP eMBB transmission method is set, the terminal can receive indications of multiple TCI states from the base station through DCI, and can assume that the data received using the QCL RS indicated by each of the multiple TCI states are different data.

[0231] In addition, since the RNTI for M-TRP URLLC and the M-TRP eMBB RNTI are used separately, the terminal can determine whether a specific transmission / reception is an M-TRP URLLC transmission / reception or an M-TRP eMBB transmission / reception. For example, if the RNTI for URLLC is used and CRC masking is performed on the DCI, the terminal can determine the corresponding transmission as a URLLC transmission. In addition, if the RNTI for eMBB is used and CRC masking is performed on the DCI, the terminal can determine the corresponding transmission as an eMBB transmission. As another example, the base station can set the M-TRP URLLC transmission / reception method or the M-TRP eMBB transmission / reception method to the terminal through new signaling.

[0232] For the convenience of explanation of the present disclosure, it is assumed that two TRPs cooperate with each other to perform transmission / reception operations, but this is not limited thereto. That is, the present disclosure can be expanded to a multi-TRP environment of three or more, and can also be expanded to an environment in which transmission / reception is performed using different panels or beams in the same TRP. A terminal can recognize different TRPs as having different TCI states. When a terminal transmits / receives data / DCI / UCI using TCI state 1, it means that it transmits / receives data / DCI / UCI / from TRP 1 (or to TRP 1).

[0233] The present disclosure can be utilized in situations where M-TRPs perform cooperative transmission of PDCCHs (repeatedly transmitting the same PDCCH or transmitting it in segments). Furthermore, the present disclosure can also be utilized in situations where M-TRPs perform cooperative transmission of PDSCHs or cooperative reception of PUSCHs / PUCCHs.

[0234] Additionally, in describing the present disclosure, the meaning that multiple base stations (i.e., M-TRPs) repeatedly transmit the same PDCCH may mean that the same DCI is transmitted through multiple PDCCH candidates, and is the same as the meaning that multiple base stations repeatedly transmit the same DCI. Here, two DCIs having the same DCI format / size / payload can be viewed as the same DCI.

[0235] Alternatively, if the scheduling results are the same even though the payloads of two DCIs are different, the two DCIs can be considered the same DCI. For example, the time domain resource allocation (TDRA) field of a DCI can relatively determine the slot / symbol positions of data and the slot / symbol positions of A(ACK) / N(NACK) based on the time of reception of the DCI.

[0236] At this time, if the DCI received at point n and the DCI received at point n+1 indicate the same scheduling result to the terminal, the TDRA fields of the two DCIs will be different, and as a result, the DCI payloads will be different. Therefore, even if the payloads of the two DCIs are different, if the scheduling results are the same, the two DCIs can be viewed as the same DCI. Here, the number of repetitions R can be directly indicated by the base station to the terminal or can be mutually agreed upon.

[0237] Alternatively, even if the payloads of two DCIs are different and the scheduling results are not identical, if the scheduling result of one DCI is a subset of the scheduling result of the other DCI, the two DCIs can be considered the same DCI.

[0238] For example, if the same data is TDM-transmitted repeatedly N times, DCI 1 received before the first data indicates (or schedules) data repetition N times, and DCI 2 received before the second data indicates data repetition (scheduling) N-1 times. At this time, the scheduling result (or data) of DCI 2 becomes a subset of the scheduling result (or data) of DCI 1, and both DCIs have scheduling results for the same data. Therefore, in this case as well, the two DCIs can be viewed as the same DCI.

[0239] And, in explaining the present disclosure, multiple base stations (i.e., M-TRPs) dividing and transmitting the same PDCCH may mean transmitting one DCI through one PDCCH candidate, with TRP 1 transmitting some resources defined for the PDCCH candidate and TRP 2 transmitting the remaining resources.

[0240] For example, if TRP 1 and TRP 2 divide and transmit PDCCH candidates corresponding to aggregation levels m1 + m2, the PDCCH candidates are divided into PDCCH candidate 1 corresponding to aggregation level m1 and PDCCH candidate 2 corresponding to aggregation level m2, and TRP 1 can transmit PDCCH candidate 1 and TRP 2 can transmit PDCCH candidate 2. At this time, TRP 1 and TRP 2 can transmit PDCCH candidate 1 and PDCCH candidate 2 using different time / frequency resources. After receiving PDCCH candidate 1 and PDCCH candidate 2, the terminal can generate a PDCCH candidate corresponding to aggregation level m1 + m2 and attempt DCI decoding.

[0241] At this time, the method of dividing the same DCI and transmitting it to multiple PDCCH candidates can be implemented in the following two ways.

[0242] The first method is a method in which a DCI payload (e.g., control information + CRC) is encoded through a single channel encoder (e.g., a polar encoder) and transmitted by dividing it into two TRPs. In other words, the first method means a method in which the coded bits obtained according to the encoding result are divided and transmitted into the two TRPs. Here, the entire DCI payload may be encoded in the coded bits transmitted by each TRP, but this is not limited, and only a portion of the DCI payload may be encoded.

[0243] The second method divides the DCI payload (e.g., control information + CRC) into two DCIs (e.g., DCI 1 and DCI 2), and then encodes each of them using a channel encoder (e.g., a polar encoder). Then, each of the two TRPs can transmit the coded bits corresponding to DCI 1 and the coded bits corresponding to DCI 2 to the terminal.

[0244] That is, the fact that multiple base stations (M-TRPs) divide / repeat the same PDCCH and transmit it over multiple MOs (monitoring occasions) can mean 1) repeatedly transmitting coded bits encoding the entire DCI content of the corresponding PDCCH through each MO for each base station (S-TRP), 2) dividing the coded bits encoding the entire DCI content of the corresponding PDCCH into multiple parts, and transmitting different parts through each MO for each base station (S-TRP), or 3) dividing the DCI content of the corresponding PDCCH into multiple parts, encoding different parts for each base station (S-TRP) (i.e., separate encoding), and transmitting them through each MO.

[0245] Repeated / divided transmission of PDCCH can be understood as transmitting PDCCH multiple times over multiple TOs (transmission occasions).

[0246] Here, TO may refer to a specific time and / or frequency resource unit in which the PDCCH is transmitted. For example, if the PDCCH is transmitted multiple times (in a specific RB) across slots 1, 2, 3, and 4, TO may refer to each slot. As another example, if the PDCCH is transmitted multiple times (in a specific slot) across RB sets 1, 2, 3, and 4, TO may refer to each RB set. As another example, if the PDCCH is transmitted multiple times across different times and frequencies, TO may refer to each time / frequency resource. In addition, the TCI state used for DMRS channel estimation may be set differently for each TO, and TOs with different TCI states may be assumed to have been transmitted by different TRPs / panels.

[0247] Repeated or divided transmission of a PDCCH by multiple base stations means that the PDCCH is transmitted across multiple TOs, and the union of the TCI states set for the TOs consists of two or more TCI states. For example, if a PDCCH is transmitted across TOs 1, 2, 3, and 4, TCI states 1, 2, 3, and 4 may be set for TOs 1, 2, 3, and 4 respectively, which means that TRP i cooperatively transmitted the PDCCH on TO i.

[0248] In describing the present disclosure, when a terminal repeatedly transmits the same PUSCH to multiple base stations (i.e., M-TRP), it may mean that the terminal transmits the same data through multiple PUSCHs, and each PUSCH may be transmitted in an optimized manner on an UL channel of a different TRP.

[0249] For example, a terminal may repeatedly transmit the same data through PUSCH 1 and PUSCH 2. At this time, PUSCH 1 is transmitted using UL TCI state 1 for TRP 1, and link adaptation such as precoder / MCS may also be scheduled with a value optimized for the channel of TRP 1, and the PUSCH may be transmitted. PUSCH 2 is transmitted using UL TCI state 2 for TRP 2, and link adaptation such as precoder / MCS may also be scheduled with a value optimized for the channel of TRP 2, and the PUSCH may be transmitted. At this time, PUSCH 1 and PUSCH 2 that are repeatedly transmitted may be transmitted at different times and may be TDM, FDM, or SDM.

[0250] In addition, in explaining the present disclosure, the fact that a terminal divides the same PUSCH into multiple base stations (i.e., M-TRPs) and transmits it may mean that one data is transmitted through one PUSCH, but resources allocated to the PUSCH are divided and transmitted in an optimized manner on UL channels of different TRPs.

[0251] For example, a terminal can transmit the same data through a 10-symbol PUSCH. At this time, the first 5 symbols of the 10 symbols can be transmitted using UL TCI state 1 for TRP 1, and the terminal can transmit the 5-symbol PUSCH (as TRP 1) by scheduling a value optimized for the channel of TRP 1, such as a precoder / MCS, for link adaptation. The remaining 5 symbols can be transmitted using UL TCI state 2 for TRP 2, and the terminal can transmit the remaining 5-symbol PUSCH (as TRP 2) by scheduling a value optimized for the channel of TRP 2, such as a precoder / MCS, for link adaptation.

[0252] In the above example, a method of dividing one PUSCH into time resources and performing TDM for transmission toward TRP 1 and transmission toward TRP 2 was described, but the present disclosure is not limited thereto, and a terminal can divide the same PUSCH and transmit it to multiple base stations by using the FDM / SDM method.

[0253] A terminal can repeatedly transmit a PUCCH to multiple base stations (similar to PUSCH transmission) or divide and transmit the same PUCCH.

[0254] And, when multiple TOs are indicated to a UE in order to repeatedly transmit or divide PDCCH / PDSCH / PUSCH / PUCCH, each TO can transmit UL toward a specific TRP or receive DL from a specific TRP. At this time, the UL TO transmitted toward TRP 1 (or TO of TRP 1) may mean a TO that uses the first value among two spatial relations, two UL TCIs, two UL power control parameters, or two PL (pathloss)-RSs indicated to the UE. And, the UL TO transmitted toward TRP 2 (or TO of TRP 2) means a TO that uses the second value among two spatial relations, two UL TCIs, two UL power control parameters, and two PL-RSs indicated to the UE.

[0255] Similarly, in DL transmission, the DL TO transmitted by TRP 1 (or TO of TRP 1) may mean a TO that uses the first value among the two DL TCI states indicated to the terminal (for example, when two TCI states are set in CORESET), and the DL TO transmitted by TRP 2 (or TO of TRP 2) may mean a TO that uses the second value among the two DL TCI states indicated to the terminal (for example, when two TCI states are set in CORESET).

[0256] The present disclosure can be extended to various channels, such as PUSCH / PUCCH / PDSCH / PDCCH. Furthermore, the present disclosure can be extended to both cases where the channels are repeatedly transmitted on different space / time / frequency resources and cases where the channels are transmitted in segmented manner.

[0257] In addition, from the perspective of DCI transmission, the M-TRP transmission method can be divided into i) M-TRP transmission method based on M-DCI (multiple DCI) in which each TRP transmits a different DCI, and ii) M-TRP transmission method based on S-DCI (single DCI) in which one TRP transmits a DCI. For example, in the case of S-DCI, all scheduling information for data transmitted by an M-TRP must be transmitted through a single DCI, so it can be used in an ideal BH (ideal BackHaul) environment in which dynamic cooperation between two TRPs is possible.

[0258] Enhanced M-TRP transmission and reception

[0259] In relation to M-TRP transmission and reception in Rel-16 NR standardization, PDSCH transmission and reception according to S-DCI-based M-TRP transmission method and M-DCI-based M-TRP transmission method are supported.

[0260] First, we will look at the S-DCI-based M-TRP PDSCH transmission method.

[0261] S-DCI-based M-TRP PDSCH transmission can use one of SDM / FDM / TDM methods. In the case of SDM, the base station transmits one TB using multiple layers, and transmits layers belonging to different DMRS CDM groups using different transmit beams (i.e., QCL RS or TCI states). This can increase the number of layers compared to the existing S-TRP transmission method, thereby improving transmission capacity. In addition, when one TB is transmitted using multiple layers, some layers are transmitted to TRP 1 and the remaining layers are transmitted to TRP 2, which can improve channel reliability due to diversity gain.

[0262] For FDM, two schemes, scheme 2a and 2b, are supported. Here, scheme 2a transmits one TB to multi-RBs, but transmits RBs belonging to different RB groups with different Tx beams (i.e., QCL RS or TCI states). Scheme 2b transmits the same TB to different RB groups, but transmits RBs belonging to different RB groups with different Tx beams (i.e., QCL RS or TCI states). For TDM, two schemes, scheme 3 and 4, are supported. Here, scheme 4 (i.e., inter-slot TDM) repeatedly transmits the same TB in multiple slots, but transmits slots belonging to different slot groups with different Tx beams (i.e., QCL RS or TCI states). On the other hand, Scheme 3 (i.e., intra-slot TDM) repeatedly transmits the same TB in multiple OFDM symbol groups, but transmits some OFDM symbol groups and the remaining OFDM symbol groups with different Tx beams (i.e., QCL RS or TCI state).

[0263] Next, we will look at the M-DCI-based M-TRP PDSCH transmission method.

[0264] M-DCI based MTRP PDSCH transmission is a method in which each TRP schedules and transmits PDSCH through DCI. That is, TRP 1 transmits PDSCH 1 through DCI 1, and TRP 2 transmits PDSCH 2 through DCI 2. When PDSCH 1 and PDSCH 2 overlap in the same frequency / time resource, two PDSCHs are received for the same RE, which increases resource efficiency and increases transmission capacity. To this end, the concept of a CORESET pool, which refers to a group of multiple CORESETs, was introduced. For example, TRP 1 transmits a PDCCH through a CORESET belonging to CORESET pool 0, and also transmits the PDSCH scheduled by the PDCCH. TRP 2 transmits a PDCCH through a CORESET belonging to CORESET pool 1, and also transmits the PDSCH scheduled by the PDCCH.

[0265] Even for PUSCH, specific TRPs can schedule PUSCH transmissions to UEs via CORESETs within each COERSET pool. For example, some PUCCH resources may be scheduled by TRP 1, while the remaining PUCCH resources may be scheduled by TRP 2. UEs can transmit independent PUSCH / PUCCHs for each of TRPs 1 and 2.

[0266] In addition, the terminal may recognize the PUSCH (or PUCCH) scheduled by the DCI received based on different CORESETs (or CORESETs belonging to different CORESET groups) as a PUSCH (or PUCCH) transmitted to different TRPs or as a PUSCH (or PUCCH) of different TRPs. In addition, the method for UL transmission (e.g., PUSCH / PUCCH) transmitted to different TRPs can be equally applied to UL transmission transmitted to different panels belonging to the same TRP.

[0267] In addition, the CORESET group ID (or COERSET pool index having the same meaning) described / mentioned in the present disclosure may mean an index / identification information (e.g., ID) for distinguishing the CORESET for each TRP / panel. And the CORESET group may mean a group / union of CORESETs distinguished by an index / identification information (e.g., ID) / CORESET group ID for distinguishing the CORESET for each TRP / panel. For example, the CORESET group ID may be specific index information defined in the CORESET configuration. That is, the CORESET group may be set / indicated / defined by an index defined in the CORESET configuration for each CORESET. And / or, the CORESET group ID may mean an index / identification information / indicator for distinguishing / identifying the CORESETs set / associated with each TRP / panel.

[0268] The CORESET group ID described / mentioned in the present disclosure may be expressed by being replaced with a specific index / specific identification information / specific indicator for distinguishing / identifying the CORESETs set / associated with each TRP / panel. The information may be set / indicated through higher layer signaling (e.g., RRC signaling, MAC-CE, etc.) and / or physical layer signaling (e.g., DCI). For example, PDCCH detection may be set / indicated to be performed for each TRP / panel in units of the corresponding CORESET group, and UCI (e.g., CSI, HARQ-ACK / NACK, SR, etc.) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) may be set / indicated to be managed / controlled separately for each TRP / panel in units of the corresponding CORESET group. And / or, HARQ ACK / NACK (process / retransmission) for PDSCH / PUSCH, etc. scheduled for each TRP / panel by CORESET group unit can be managed.

[0269] For example, the upper layer parameter ControlResourceSet information element (IE) is used to configure a time / frequency control resource set (CORESET). The CORESET may be related to detection / reception of downlink control information. The ControlResourceSet IE may include a CORESET-related ID (e.g., controlResourceSetID) / a CORESET pool index for the CORESET (e.g., CORESETPoolIndex) / time / frequency resource configuration of the CORESET / TCI information related to the CORESET, etc. For example, the index of the CORESET pool (e.g., CORESETPoolIndex) may be set to 0 or 1. In the description above in the present disclosure, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (e.g., CORESETPoolIndex). The above-described ControlResourceSet (i.e., CORESET) can be set via higher layer signaling (e.g., RRC signaling).

[0270] Additionally, with respect to M-TRP transmission and reception in Rel-17 NR standardization, M-TRP PDCCH / PDSCH SFN transmission, S-DCI-based M-TRP PUSCH repeated transmission, and single PUCCH resource-based M-TRP PUCCH repeated transmission are supported. These transmission techniques repeatedly transmit the same contents (i.e., DCI / UL TB / UCI, etc.) with improved URLLC target for increased reliability. Here, M-TRP PDCCH repeated transmission is performed based on TDM or FDM, M-TRP PDCCH / PDSCH SFN transmission is performed in the same time / frequency / layer, S-DCI-based M-TRP PUSCH repeated transmission is performed based on TDM, and single PUCCH resource-based M-TRP PUCCH repeated transmission is performed based on TDM.

[0271] First, we will look at the S-DCI-based M-TRP PDCCH repetition transmission method.

[0272] In the NR Rel-17 standardization, multiple CORESETs with different TCI states (i.e., different QCL RSs) are configured for the UE for repeated M-TRP PDCCH transmission, and multiple SS (Search Space) sets are configured, each linked to the corresponding CORESETs. The base station can instruct / configure the UE that the SS set connected to one CORESET and the SS set connected to another CORESET are linked for repeated transmission. Through this, the UE can be informed that the PDCCH candidates of the corresponding SS set are being repeatedly transmitted.

[0273] For example, two CORESETs, CORESET 0 and CORESET 1, may be set for a terminal, CORESET 0 and CORESET 1 may be connected to SS set 0 and SS set 1, respectively, and SS set 0 and SS set 1 may be linked. The terminal may recognize that the same DCI has been repeatedly transmitted in the PDCCH candidate of SS set 0 and the PDCCH candidate of SS set 1, and may recognize that a specific PDCCH candidate of SS set 0 and a specific PDCCH candidate of SS set 1 are a pair set for repeatedly transmitting the same DCI based on a specific rule. The two PDCCH candidates are referred to as linked PDCCH candidates, and the terminal may successfully decode the corresponding DCI if it properly receives either of the two PDCCH candidates. However, when receiving a PDCCH candidate of SS set 0, the terminal may use the QCL RS (i.e., DL beam) of the TCI state of COERSET 0 connected to SS set 0, and when receiving a PDCCH candidate of SS set 1, the terminal may use the QCL RS (i.e., DL beam) of the TCI state of COERSET 1 connected to SS set 1. Accordingly, the terminal receives linked PDCCH candidates using different beams.

[0274] Next, we will look at the M-TRP SFN PDCCH / PDSCH transmission method.

[0275] M-TRP is a type of PDCCH repetition transmission, in which multiple TRPs can repeatedly transmit the same DCI through the same time / frequency / DMRS port. This transmission method can be referred to as SFN PDCCH transmission. However, for SFN PDCCH transmission, instead of configuring multiple CORESETs with different TCI states, the base station configures multiple TCI states in a single CORESET. When a terminal receives a PDCCH candidate through an SS set connected to a single CORESET, it can perform channel estimation of the PDCCH DMRS using all of the multiple TCI states and attempt decoding.

[0276] In addition, when the above-described M-TRP PDSCH is repeatedly transmitted, the two TRPs repeatedly transmit the corresponding channel on different resources. However, if the two TRPs use the same resource, that is, if the same channel is repeatedly transmitted through the same frequency / time / layer (i.e., DMRS port), the reliability of the corresponding channel can be improved. In this case, the repeatedly transmitted same channel is not distinguished in terms of resources, so it is received by being combined during transmission (i.e., over the air), and thus can be recognized as a single channel (e.g., a composite channel) from the perspective of the receiving end (e.g., a terminal). For SFN PDSCH transmission, two DL TCI states for PDSCH DMRS reception can be set for the terminal.

[0277] Next, we will look at the S-DCI-based M-TRP PUSCH repetitive transmission scheme.

[0278] In NR Rel-17 standardization, the base station configures two SRS sets for the UE for S-DCI-based M-TRP PUSCH transmission, and each set is used to indicate the UL Tx port and UL beam / QCL information for TRP 1 and TRP 2, respectively. In addition, the base station can indicate SRS resources for each SRS resource set through two SRI fields included in one DCI, and can indicate up to two PC parameter sets. For example, the first SRI field can indicate the SRS resources and PC parameter set defined in SRS resource set 0, and the second SRI field can indicate the SRS resources and PC parameter set defined in SRS resource set 1. The UE can be indicated the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 1 through the first SRI field, and through this, the UE performs PUSCH transmission in the TO corresponding to SRS resource set 0. Similarly, the terminal can be instructed with the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 2 through the second SRI field, through which the terminal performs PUSCH transmission in the TO corresponding to SRS resource set 1.

[0279] Next, we examine a single PUCCH resource-based M-TRP PUCCH repetition transmission scheme.

[0280] In NR Rel-17 standardization, for M-TRP PUCCH transmission based on a single PUCCH resource, a base station can activate / configure two spatial relation info (if FR1, activate / configure two PC parameter sets) for a single PUCCH resource to a UE. When UL UCI is transmitted through the PUCCH resource, each spatial relation info is used to indicate spatial relation info toward TRP 1 and TRP 2 to the UE. For example, through the value indicated in the first spatial relation info, the UE is instructed with Tx beam / PC parameter(s) toward TRP 1, and the UE performs PUCCH transmission at the TO corresponding to TRP 1 using the information. Similarly, through the value indicated in the second spatial relation info, the UE is instructed with Tx beam / PC parameter(s) toward TRP 2, and the UE performs PUCCH transmission at the TO corresponding to TRP 2 using the information.

[0281] In addition, for M-TRP PUCCH repeated transmission, the configuration method has been improved so that two new spatial relation info can be configured for a PUCCH resource. That is, if PC (power control) parameters such as PLRS, Alpha, P0, and Closed loop index are configured for each spatial relation info, a spatial relation RS can be configured. Consequently, PC information and spatial relation RS information corresponding to two TRPs can be configured through two spatial relation info. Through this, the terminal transmits a UCI (i.e., CSI, ACK / NACK, SR, etc.) PUCCH using the first spatial relation info in the first TO, and transmits the same UCI PUCCH using the second spatial relation info in the second TO. In the present disclosure, a PUCCH resource with two spatial relation info configured is referred to as an M-TRP PUCCH resource, and a PUCCH resource with one spatial relation info configured is referred to as an S-TRP PUCCH resource.

[0282] Additionally, in NR wireless communication systems, multi-TB PUSCH / PDSCH scheduling based on S-DCI may be considered. For example, in ultra-high frequency bands (e.g., beyond 5.26 GHz, FR2 band) of NR wireless communication systems (e.g., Rel-17-based NR systems), a method in which a single DCI simultaneously schedules multiple PUSCHs / PDSCHs may be supported.

[0283] As a specific example, multiple time resources (e.g., TDRA, TO (Transmission Occasion)) can be indicated at once through the time resource allocation field (e.g., TDRA field) of the DCI that schedules the PUSCH. In this case, different TBs can be transmitted for each TO through the PUSCH. The values ​​of the frequency resource allocation field (e.g., FDRA field), the Modulation and Coding Scheme (MCS) field, the transmitted precoding matrix indicator (TPMI) field, and / or the SRS resource Indicator (SRI) field of the DCI can be commonly applied to multiple TBs to be scheduled. In addition, the new data indicator (NDI) and the redundancy version (RV) for each TB are individually indicated through the DCI, and the HARQ number is indicated by a single value, but can sequentially increase in the order of the TOs based on the initial TO.

[0284] Additionally, in relation to the NR wireless communication system, a method in which a terminal simultaneously transmits multiple channels / RSs of the same type or multiple channels / RSs of different types may be considered.

[0285] Existing terminals have limitations in transmitting multiple channels / RSs at a single point in time. For example, a terminal can simultaneously transmit multiple SRS resources from different SRS resource sets for UL beam management, but cannot simultaneously transmit multiple PUSCHs. In contrast, future advanced terminals may consider relaxing these limitations and simultaneously transmitting multiple channels / RSs using multiple transmission panels. Such terminals may be referred to as STxMP (simultaneous transmission across multi-panel) terminals.

[0286] For example, a method may be applied in which two PUSCHs corresponding to two UL TBs (i.e., a first PUSCH and a second PUSCH) are scheduled in the same RE (resource element), a first spatial information RS and a first power control (PC) parameter set are set for the first PUSCH, and a second spatial information RS and a second PC parameter set are set for the second PUSCH. That is, a first UL TCI state may be set for the first PUSCH, and a second UL TCI state may be set for the second PUSCH. In this case, the UE may transmit the first PUSCH using a first Tx spatial filter (e.g., a first panel) corresponding to the first UL TCI state, and transmit the second PUSCH using a second Tx spatial filter (e.g., a second panel) corresponding to the second UL TCI state.

[0287] In this regard, when the base station schedules the PUSCH through DCI, the base station can instruct the terminal on which of the STxMP scheme, single panel-based scheme, or M-TRP-based PUSCH repetition transmission scheme to apply as the corresponding PUSCH transmission scheme. Here, the STxMP scheme is possible if the terminal supports STxMP capability, and the STxMP mode needs to be enabled in advance for the terminal through RRC signaling, etc. To this end, the existing SRS resource set indication field may be redefined, or a new DCI field may be introduced.

[0288] Additionally, with respect to the aforementioned STxMP transmission method, two methods can be considered: the SFN (single frequency network) method and the SDM (spatial division multiplexing) method.

[0289] Specifically, the SFN method transmits the same channel transmitted by one panel to other panels. Since the UL channels of each panel may differ, UL transmission can be performed using different precoders, different transmit powers, and different transmission beams (e.g., spatial relationship RSs indicated by the UL TCI status) for each panel.

[0290] The SDM method is a method that can be applied to transmission based on ranks greater than or equal to 2, and is a method in which some layers among multi-layers are transmitted on one panel and the remaining layers are transmitted on another panel. For example, in the case of the SDM method for 2-layer transmission, the first layer may be transmitted on the first panel, and the second layer may be transmitted on the second panel. In this case, since the UL channels of each panel may be different, UL transmission may be performed using different precoders, different transmit powers, and different transmit beams (e.g., spatial relationship RSs indicated by the UL TCI state) for each panel.

[0291] The panels described in this disclosure may be applied by replacing them with other resources / terms corresponding to the panels.

[0292] For example, different panels may be mapped to and used for different SRS resource sets or SRS resources. As a specific example, a first panel may be mapped to SRS resource set 0, and a second panel may be mapped to SRS resource set 1. In this case, the SRS resource(s) belonging to SRS resource set 0 may be associated with the (transmit) antenna port of the first panel, and the SRS resource(s) belonging to SRS resource set 1 may be associated with the (transmit) antenna port of the second panel.

[0293] In addition, in NR wireless communication systems, not only the DL TCI state but also the UL TCI state can be indicated together through DL DCI (e.g., DCI format 1_1 / 1_2, etc.), and only the UL TCI state can be indicated without indicating the DL TCI state. Through this, the method(s) used for UL spatial information (e.g., UL beam) and PC (power control) setting in existing NR wireless communication systems (e.g., NR systems in Rel-15 / 16) can be replaced / extended and applied as a method for indicating the UL TCI state.

[0294] As a concrete example, one UL TCI state can be indicated through the TCI field of DL DCI, and the UL TCI state can be applied to all PUSCHs / PUCCHs after a certain period of time (e.g., beam application time). In addition, the UL TCI state can be applied to some or all SRS resource sets.

[0295] In this regard, a method of indicating multiple UL TCI states (and / or DL ​​TCI states) through the TCI field of DL DCI may also be considered.

[0296] S-TRP / M-TRP scheduling based on 2-stage DCI

[0297] For M-TRP scheduling using a single DCI (e.g., S-DCI-based MTRP scheduling), the DCI overhead is high, and scheduling constraints may occur as M-TRPs share some DCI fields.

[0298] Regarding DCI overhead, in the existing M-TRP-based PDSCH / PUSCH transmission scheme, DCI is designed to enable dynamic scheduling for S-TRP / M-TRP, and the DCI size can be determined according to the amount of M-TRP scheduling information with high DCI overhead. For example, in an NR wireless communication system, M-TRP transmission and reception between up to two TRPs is possible, and for this purpose, the fields described below are additionally defined in the DCI for M-TRP (e.g., the second TRP).

[0299] For example, in UL DCI, i.e., PUSCH scheduling DCI (e.g., DCI format 0_1), a second TPMI field (up to 6 bits), a second SRI field (up to 2 bits), an SRS resource set indication field (2 bits), a second PTRS field (2 bits), a second TPC command field for PUSCH (2 bits), etc. may be additionally defined (e.g., a total of 14 bits). These fields may be used for transmission and reception of a second TRP (or second panel) participating in cooperation when an M-TRP (or STxMP) transmission scheme is used. Specifically, in the SRS resource set indication field, a value of 00 / 01 may be indicated to dynamically switch an S-TRP (or single panel) transmission and reception operation in which one TRP is selected, and a value of 10 may be indicated to dynamically switch an M-TRP (or STxMP) transmission and reception operation. At this time, if the S-TRP operation is selected, the fields added for the aforementioned second TRP are not used, so the DCI overhead increases unnecessarily.

[0300] For another example, in DL DCI, i.e., PDSCH scheduling DCI (e.g., DCI format 1_1), a TCI selection field (2 bits), a second TPC command field (2 bits) for PUCCH, etc. may be additionally defined (e.g., a total of 4 bits). These fields may be used for transmission and reception of the second TRP participating in cooperation when the M-TRP transmission method is used. Specifically, in the TCI selection field, a value of 00 / 01 may be indicated to dynamically switch an S-TRP transmission and reception operation in which one TRP is selected, and a value of 10 may be indicated to dynamically switch an M-TRP transmission and reception operation. In this case, when the S-TRP operation is selected, the fields added for the aforementioned second TRP are not used, so that the DCI overhead unnecessarily increases.

[0301] The aforementioned M-TRP related fields were designed assuming two TRPs / panels, but if the number of M-TRPs increases in the future, scheduling information for the third TRP / panel, the fourth TRP / panel, etc. must also be additionally transmitted, so the DCI overhead may increase further.

[0302] Additionally, since M-TRPs share some DCI fields, the following scheduling constraints may arise:

[0303] For example, in the case of MCS, there is a constraint that M-TRPs performing NCJT transmission are set to the same MCS through a single MCS field. Although the quality of the DL channel (e.g., SINR) may be different for each M-TRP, the constraint prevents an MCS optimized for each DL channel from being set. The same problem also occurs in the case of SDM STxMP terminals. There is a constraint that panels performing SDM STxMP transmission are set to the same MCS through a single MCS field. Although the quality of the UL channel (e.g., SINR) may be different for each panel, the constraint prevents an MCS optimized for each UL channel from being set.

[0304] For another example, in the case of DMRS, M-TRPs performing NCJT transmissions divide the ports indicated through a single DMRS field based on a set of rules. Therefore, the DMRS port optimized for each TRP's situation (e.g., DMRS port distribution considering MU-MIMO scheduling) may not be available. The same problem also occurs in the case of SDM STxMP terminals. Panels divide the ports indicated through a single DMRS field based on a set of rules. Therefore, the DMRS port optimized for each panel's situation (e.g., DMRS port distribution considering MU-MIMO scheduling) may not be available.

[0305] For another example, in the case of TDRA, the first slot for the first transmission occasion (TO) is determined through TDRA, and M-TRPs participating in DL TD repetition transmission must transmit and receive channels in subsequent consecutive slots / symbols. If some slots are not suitable for repetition transmission (e.g., due to collision with UL slots or SSB transmission slots), transmission in the corresponding slots may be dropped, or even if transmission is performed, the number of OFDM slots may be adjusted, etc. In addition, even if the terminal performs UL TD repetition transmission, the same problem may occur for the PUSCH / PUCCH that is repeatedly transmitted.

[0306] For another example, in the case of FDRA, M-TRPs participating in DL FD repeat transmissions must divide their allocated RBs in a rule-based manner to transmit PDSCHs. While each M-TRP may have different RBs with good DL channel quality (e.g., SINR), this constraint prevents the optimal RB allocation for each DL channel.

[0307] Additionally, if these fields are later added to the DCI by separating them specifically from the TRP for scheduling flexibility, the problem of increased DCI overhead as described above may arise.

[0308] In order to solve the aforementioned problems, the present disclosure proposes a method for performing M-TRP scheduling based on a two-step DCI.

[0309] Specifically, in the proposed method of the present disclosure, the base station and the terminal can divide an existing DCI (e.g., one DCI in S-DCI-based M-TRP scheduling) into a first DCI and a second DCI. Here, the first DCI can be transmitted and received including S-TRP scheduling information, and the second DCI can be transmitted and received including M-TRP scheduling information. For example, in relation to scheduling for multiple TRPs, scheduling information for the first TRP can be included in the first DCI, and scheduling information for the remaining TRPs (e.g., the second TRP, the third TRP, the fourth TRP, etc.) can be included in the second DCI.

[0310] The S-TRP scheduling information and M-TRP scheduling information described in the present disclosure may be applied as replacements for single-panel scheduling information and multi-panel scheduling information, respectively, for UL transmission. For example, in relation to scheduling for multiple panels, scheduling information for the first panel may be included in the first DCI, and scheduling information for the remaining panels (e.g., the second panel, the third panel, the fourth panel, etc.) may be included in the second DCI.

[0311] When the base station indicates S-TRP transmission (or single panel transmission), the base station transmits only the first DCI, and the terminal can obtain scheduling information for the scheduled channel (e.g., PDSCH / PUSCH) by decoding only the first DCI. In contrast, when the base station indicates M-TRP transmission (or STxMP transmission), the base station transmits both the first DCI and the second DCI, and the terminal can obtain scheduling information for the scheduled channel (e.g., PDSCH / PUSCH) by decoding both the first DCI and the second DCI.

[0312] Through the proposed method of the present disclosure, in the case of S-TRP transmission / scheduling, only the first DCI can be transmitted and received, thereby reducing DCI overhead, and in the case of M-TRP transmission / scheduling, both the first DCI and the second DCI can be transmitted and received, thereby indicating all information required for M-TRP transmission through the DCI. The higher the S-TRP scheduling ratio of the base station is than the M-TRP scheduling ratio, the greater the DCI overhead reduction effect, and as the number of M-TRPs increases, the size of the second DCI increases, thereby increasing the DCI overhead reduction effect.

[0313] Considering the S-TRP scheduling ratio, the number of M-TRPs, etc., the base station can determine whether it is advantageous to use a single DCI like the existing method for M-TRP scheduling or to use a two-stage DCI according to the proposed method of the present disclosure. In this case, the base station can set / instruct the terminal which of the two methods to use through signaling such as MAC-CE / RRC / DCI.

[0314] Hereinafter, with respect to the two-stage DCI according to the proposed method of the present disclosure, scheduling information included in the first DCI (e.g., S-TRP / single panel scheduling information) and scheduling information included in the second DCI (e.g., M-TRP / multi-panel scheduling information) are specifically described.

[0315] Scheduling information included in the first DCI

[0316] When considering only S-TRP (or single panel) transmission in existing NR wireless communication systems, the scheduling information of DL DCI (e.g., DCI format 1_1) and UL DCI (e.g., DCI format 0_1) is at most about 70 bits for DL ​​DCI and at most about 80 bits for UL DCI, where a 24-bit CRC can be added to determine the DCI size. Since this is a value calculated based on the maximum number of fields and the maximum field size, the actual DCI size used may be smaller than this.

[0317] The first DCI may include various DCI fields set for S-TRP (or single panel) transmission (of an existing NR wireless communication system), and may additionally indicate information on whether a channel scheduled using the first DCI is S-TRP transmission or M-TRP transmission. If M-TRP transmission is indicated, the first DCI may indicate information on the number of M-TRPs and transmission techniques. For example, the transmission techniques that can be indicated may include CJT (Coordinated Joint Transmission), SFN (Single Frequency Network), NCJT (non-CJT), TD / FD repetition (Time Domain / Frequency Domain Repetition), SFN STxMP (Single Frequency Network Simultaneous Transmission from Multiple Points), SDM STxMP (Spatial Division Multiplexing Simultaneous Transmission from Multiple Points), etc.

[0318] When S-TRP transmission is indicated, the terminal can obtain all scheduling information for the channel (e.g., PUSCH / PDSCH) on which S-TRP is transmitted through the first DCI and does not receive the second DCI. Even in this case, the terminal can dynamically select one TRP / panel through dynamic TRP selection (DPS) or dynamic panel selection, since the terminal can select one QCL RS (or spatial relationship RS) (per QCL type) to be used for transmission and reception of the scheduled channel using the TCI selection field or the TCI field in the first DCI.

[0319] When M-TRP transmission is indicated, the terminal can obtain scheduling information for the first TRP participating in the M-TRP transmission through the first DCI, and can obtain scheduling information for the remaining TRPs through the second DCI. In addition, the terminal can obtain common information shared by the M-TRPs (e.g., the first TRP and the remaining TRPs) through the first DCI. For example, when using the same frequency / time resources, the RA field information in the first DCI can be commonly applied to all M-TRP transmissions and receptions.

[0320] When the number of M-TRPs (or the number of transmission panels) is indicated through the first DCI (or when the base station indicates the number of M-TRPs to the terminal through another signal), the number / size of fields of the second DCI may be determined according to the number of M-TRPs. For example, when the number of TRPs is 2, various fields (e.g., various fields described in relation to the above-mentioned problem) may be added one by one for the second TRP, but when the number of TRPs is 3, one field each may be added for the second TRP and the third TRP. Alternatively, the number of fields may be maintained as is, and the field sizes may be increased so that information for both the second TRP and the third TRP can be provided through one field.

[0321] When the M-TRP technique (or STxMP technique) is indicated through the first DCI (or when the base station indicates the M-TRP technique to the UE through another signal), the number / size of fields of the second DCI can be determined according to the M-TRP technique. This is because the M-TRP scheduling information required for each M-TRP technique is different. For example, in case of M-TRP SFN transmission and M-TRP CJT transmission, since the M-TRPs (e.g., the first TRP and the remaining TRPs) transmit the same layer, the UE only needs the DMRS information of the first DCI, and the second DCI does not need to include the DMRS information. In addition, since the M-TRPs transmit the same codeword, they can share the same MCS / HARQ information (e.g., number of HARQs / NDI / RV, etc.). Therefore, the information exists only in the first DCI, and does not exist in the second DCI. In case of M-TRP NCJT transmission, since M-TRPs (e.g., the first TRP and the remaining TRPs) transmit different layers, the terminal needs DMRS information of the first DCI (e.g., DMRS information for the first TRP) and DMRS information of the second DCI (e.g., DMRS information for the second TRP / third TRP / fourth TRP, etc.). In addition, if the M-TRPs transmit different codewords, MCS / HARQ information (e.g., NDI / RV, etc.) needs to be transmitted in each of the first DCI and the second DCI.

[0322] When the STxMP technique and the number of panels are indicated, the number / size of fields of the second DCI can be determined similarly to the above. For example, in the case of SDM STxMP, since different PTRSs can be transmitted for each panel, the second DCI needs to include a PTRS field (e.g., PTRS information for the second panel / third panel / fourth panel, etc.). In contrast, in the case of SFN STxMP, since all TRPs / panels must transmit the same (SFN) PTRS, only the PTRS field of the first DCI is required, and the PTRS field of the second DCI may be unnecessary. In addition, if different codeword / MCS / NDI / RS values ​​can be set for each panel in SDM STxMP, the second DCI needs to include MCS / NDI / RV fields for each panel (e.g., MCS / NDI / RV information for the second panel / third panel / fourth panel, etc.). In contrast, for SFN STxMP, since all TRPs / panels must transmit the same codeword, only the MCS / NDI / RV fields of the first DCI are required, and the MCS / NDI / RV fields of the second DCI may be unnecessary.

[0323] Information regarding the presence and number of M-TRP transmissions may be indicated via the (existing) TCI selection field or the (existing) TCI field of the first DCI. For example, if the number of TCI states indicated via the TCI selection field is n, this may mean that the number of TRPs participating in M-TRP transmission is n, and if n is 1, the terminal may assume S-TRP transmission.

[0324] Information about the M-TRP technique may be indicated via a separate field within the first DCI, or may be indicated together in the (existing) TCI Selection field / TCI field.

[0325] For example, information about whether M-TRP is transmitted, the number of M-TRPs, and the M-TRP technique can be indicated through the TCI field of the first DCI as shown in Table 6.

[0326] Table 6 shows an example of the TCI field of the first DCI in the two-step DCI method.

[0327] TCI Field Code Point Value Number of M-TRPs M-TRP Techniques 000 TCI state 11 S-TRP transmission from TRP 1 001 TCI state 21 S-TRP transmission from TRP 2 010 TCI state 1, 2, 3 CJT transmission from TRP 1, 2, 3 011 TCI state 1, 2, 4 CJT transmission from TRP 1, 2 NCJT transmission from TRP 4 100 Reserved 101 Reserved 110 Reserved 111 Reserved

[0328] In Table 6, the M-TRP technique can be determined by directly jointly encoding the TCI codepoint. However, this may increase DCI overhead, so it may be determined implicitly. For example, the terminal may receive a TCI group configuration from the base station in advance, and the M-TRP technique may be determined based on the TCI group configuration.

[0329] Table 7 shows an example of TCI group settings.

[0330] TCI Group SettingsTCI Group 1 = {TCI Subgroups 1, 2}TCI Subgroup 1 = {TCI States 1, 2, 3}TCI Subgroup 2 = {TCI States 4, 5, 6}TCI Group 2 = {TCI Subgroups 3, 4}TCI Subgroup 3 = {TCI States 7, 8, 9}TCI Subgroup 4 = {TCI States 10, 11, 12}

[0331] In Table 7, we assume that TRPs belonging to TRP group 1 and TRPs belonging to TRP group 2 are connected by a non-ideal backhaul link that cannot perform dynamic coordination (i.e., only semi-static coordination is possible). Furthermore, we assume that TRPs in the same TCI subgroup can perform coherent joint transmission, and that non-coherent transmission (i.e., SFN or NCJT) is possible between TRPs in different TCI subgroups. Furthermore, for convenience of explanation, we assume that TCI state i is mapped 1:1 to TRP i.

[0332] TCI code point 000 indicates one TCI state, in which case TRP 1 corresponding to TCI state 1 can perform S-TRP transmission for the scheduled channel. TCI code point 001 indicates one TCI state, in which case TRP 2 corresponding to TCI state 2 can perform S-TRP transmission for the scheduled channel. TCI code point 010 indicates three TCI states, in which case TRP 1, 2, and 3 corresponding to TCI states 1, 2, and 3 can perform M-TRP transmission for the scheduled channel. In this case, since TCI states 1, 2, and 3 belong to the same TCI subgroup, TRP 1, 2, and 3 can perform CJT transmission. TCI code point 011 indicates three TCI states, in which case TRPs 1, 2, and 4 corresponding to TCI states 1, 2, and 4 can perform M-TRP transmissions for scheduled channels. At this time, since TCI states 1 and 2 belong to the same TCI subgroup, TRPs 1 and 2 can perform CJT transmissions, and since TCI state 4 belongs to a different TCI subgroup, TRP 4 can perform NCJT transmissions through different layers from TRPs 1 and 2. That is, in this case, some layers of one PDSCH can be used for CJT transmissions of TRPs 1 and 2, and other layers can be used for NCJT transmissions of TRP 4.

[0333] Additionally or alternatively, information on whether or not to transmit M-TRPs may be indicated via the first DCI, and information on the number and scheme of M-TRPs may be indicated via the second DCI. In this case, the size of the second DCI may be determined as the maximum size considering both the number and scheme of M-TRPs that can be indicated. If the actual number and scheme of M-TRPs indicated are smaller than the maximum size, the DCI needs to be transmitted and received to be adjusted to the maximum size through zero padding. If the size of the second DCI is variable, the terminal must perform blind decoding by assuming multiple sizes, which may increase overhead for blind decoding. The base station may limit the number and scheme of M-TRPs that can be indicated to the terminal via an RRC or MAC CE signal.

[0334] The size of the second DCI can be determined as the maximum size considering both the number of indicative M-TRPs and the technique, and whether to use a specific field or a field associated with a specific TRP can be determined using an n-bit bitmap included in the second DCI. For example, in the case of a 3-bit bitmap, whether to use a scheduling field corresponding to the second / third / fourth TRP can be determined using the first / second / third bit. As a specific example, it can be defined that a bit value set to 0 indicates not to use the related field, and a bit value set to 1 indicates to use the related field. To this end, the second DCI has scheduling fields corresponding to the second / third / fourth TRPs, and whether to use the corresponding field can be determined through the bitmap. The bitmap may be included in the second DCI, or not, and in this case, it can be used to determine whether to use a specific field existing in the second DCI or a field associated with a specific TRP.

[0335] Additionally or alternatively, information regarding the presence and number of M-TRP transmissions may be indicated via the first DCI, and information regarding the M-TRP technique may be indicated via the second DCI. In this case, the size of the second DCI may be determined to be the maximum size considering all indicative M-TRP techniques.

[0336] Additionally or alternatively, when M-TRP transmission is indicated in the first DCI, some fields of the first DCI (e.g., TPMI, SRI, SRS resource set indicator, DMRS, PTRS) may be overridden and used to indicate M-TRP-related information, such as indications of the M-TRP technique and number. Some of the overridden fields of the first DCI may be indicated through fields of the second DCI. This allows the field size of the first DCI not to increase for indications of the M-TRP technique and number.

[0337] Scheduling information included in the second DCI

[0338] First, the second DCI for PUSCH scheduling is described.

[0339] When the number of STxMP panels is 2, the second DCI for PUSCH scheduling may include information such as a second TPMI field (up to 6 bits), a second SRI field (up to 2 bits), an SRS resource set indication field (2 bits), a second PTRS field (2 bits), a second TPC command field (2 bits) for PUSCH, a second DMRS port field (6 bits), [MCS field (5 bits), RV field (2 bits), NDI field (1 bit)] for a second codeword, and an open-loop power control parameter set indication field (2 bits). The number of bits of the information is calculated based on an NR wireless communication system and is approximately 30 bits in total, but may be different in a next-generation wireless communication system. In addition, as described in the content related to the S-TRP scheduling information of the first DCI, some information may or may not be included depending on the indicated STxMP technique. Additionally, if a TRP / panel specific RA field is introduced for TD / FD M-TRP / STxMP repetition, etc., the second DCI may additionally include a TDRA field (6 bits) and an FDRA field (n bits).

[0340] When the number of SRxMP panels is three or more, the size of the second DCI for PUSCH scheduling can increase further. For example, as described above, if there are two panels and a total of 30 bits of information are required, if there are N panels, a simple expansion requires 30*(N-1) bits of information.

[0341] Next, the second DCI for PDSCH scheduling is described.

[0342] When the number of M-TRPs is 2, the second DCI for PDSCH scheduling may include information such as an RCI selection field (2 bits), a DMRS field (8 bits), a second TPC command field (2 bits) for PUCCH, [MCS field (5 bits), RV field (2 bits), NDI field (1 bit)] for the second codeword, etc. The number of bits of the information is calculated based on the NR wireless communication system, which is approximately 20 bits in total, but may be different in the next-generation wireless communication system. In addition, as described in the S-TRP scheduling information related content of the first DCI, some information may or may not be included depending on the indicated M-TRP technique. Additionally, when a TRP specific RA field is introduced for TD / FD M-TRP repetition, etc., the second DCI may additionally include a TDRA field (6 bits) and an FDRA field (n bits).

[0343] If the number of panels is three or more, the size of the second DCI for PUSCH scheduling can increase further. For example, as described above, if there are two panels and a total of 20 bits of information are required, then if there are N panels, a simple expansion would require 20*(N-1) bits of information.

[0344] Additionally, the size of the second DCI can be reduced as follows:

[0345] To reduce the payload size of the second DCI, some fields may have dependencies on fields of the first DCI. For example, the subset that the information of the second DCI can indicate may be limited / determined based on information of the first DCI, or offset information based on information of the first DCI may be indicated in the second DCI.

[0346] As a specific example, the DMRS field, MCS field, TCI selection field, SRS resource set indication field, FDRA field, TDRA field, etc. of the second DCI described below can be set with such dependencies.

[0347] For the DMRS field of the second DCI, the field can only indicate DMRS for the remaining CDM groups, excluding the CDM group of the DMRS port indicated by the first DCI. This is to allocate DMRS ports of different CDM groups to the two TRPs, since if the TRPs are not synchronized, even if the DMRS ports are allocated based on the orthogonal cover codes (OCCs) of the two TRPs, they cannot be orthogonally separated.

[0348] For the MCS field of the second DCI, the field may indicate an offset value based on the MCS indicated by the first DCI. In addition, if the MCS of the first DCI is always set to a value greater than the MCS of the second DCI, the MCS offset range for the second DCI may be limited to 0 to a negative value.

[0349] For the TCI selection field of the second DCI, the codepoint of the TCI selection field may be defined differently depending on the TCI state for the S-TRP (e.g., the first TRP) applied to the scheduled channel of the first DCI. For example, when the first TRP is set to TCI state 1, the TCI selection field of the second DCI may be configured with M-TRPs that can cooperate with the TRP corresponding to the TCI state 1 (e.g., with TCI states corresponding to the corresponding M-TRPs). In addition, when the first TRP is set to TCI state 2, the TCI selection field of the second DCI may be configured with M-TRPs that can cooperate with the TRP corresponding to the TCI state 2 (e.g., with TCI states corresponding to the corresponding M-TRPs).

[0350] For the SRS resource set indication field of the second DCI, the codepoint of the SRS resource set indication field may be defined differently depending on the SRS resource set for a single panel (e.g., the first panel) applied to the scheduled channel of the first DCI. For example, if the first panel is set to SRS resource set 0, the SRS resource set indication field of the second DCI may be configured with multiple panels that can cooperate with the panel corresponding to SRS resource set 0 (e.g., with SRS resource sets corresponding to the panels). In addition, if the first panel is set to SRS resource set 1, the SRS resource set indication field of the second DCI may be configured with multiple panels that can cooperate with the panel corresponding to SRS resource set 1 (e.g., with SRS resource sets corresponding to the panels).

[0351] For the TDRA field / FDRA field of the second DCI, the field may indicate an offset value based on the RA indicated by the first DCI. For example, if a resource for an M-TRP can start from a symbol / RB that is offset from the starting OFDM symbol or starting RB of the resource indicated by the first DCI, the size of the resource (e.g., symbol interval or number of RBs) may be set by adding or subtracting an offset value based on the size of the resource indicated by the first DCI.

[0352] In addition, with respect to the size of the second DCI mentioned above, after determining / defining multiple candidates in advance for the amount of information / field / size of the second DCI, the base station can set / instruct the terminal on which candidate to use. For example, size #1 can be set to a large size that provides fields (e.g., MCS / DMRS / TDRA / FDRA, etc.) that are completely independent from the first DCI for M-TRPs (e.g., second TRP / third TRP / fourth TRP, etc.), and size #2 can be set to a small size that has a dependency on the first DCI. Through this, the base station can determine the size of the second DCI by considering the trade-off between DCI overhead and scheduling flexibility, and instruct the terminal on the information thereon.

[0353] Additionally, the method of setting / instructing / determining the PDCCH resource of the second DCI may be as follows.

[0354] Some or all of the PDCCH resource information of the second DCI may be determined based on the PDCCH resource of the first DCI. For example, the CCE (control channel element) resource location, aggregation level, PDCCH candidate number, PDCCH monitoring opportunity, search space set, CORESET, etc. of the second DCI may be determined based on the decoded CCE resource location, aggregation level, PDCCH candidate number, PDCCH monitoring opportunity, search space set, CORESET, etc. of the second DCI. A linkage for the corresponding information between two DCIs (e.g., the first DCI and the second DCI) may be set for the terminal, the first DCI and the second DCI may be restricted to have the same value, or the PDCCH resource information of the second DCI may be determined through offset information based on the PDCCH resource information of the first DCI. Accordingly, the terminal can recognize the presence or absence of the second DCI and PDCCH resources after detecting the first DCI, and can decode the second DCI without blind decoding.

[0355] Additionally, the method of setting / defining the CRC bits of the second DCI may be as follows.

[0356] The final size of the second DCI can be determined by adding CRC bits to the M-TRP scheduling information. In existing NR wireless communication systems, the CRC bits of the DCI are 24 bits, which accounts for a large portion of the DCI size. To reduce the size of the second DCI, a reduced CRC bit size (e.g., a CRC bit size smaller than 24 bits) can be introduced, and the second DCI may not have a CRC bit through the method described below.

[0357] For example, if the PDCCH resource of the second DCI is determined based on the PDCCH resource information of the first DCI as described above in the S-TRP scheduling information of the first DCI, the terminal can detect the presence or absence of the second DCI and the PDCCH resource after detecting the first DCI. Through this, the terminal can decode the second DCI (e.g., the second DCI having the CRC) without blind decoding and perform transmission and reception of the scheduled channel.

[0358] Even if decoding of the second DCI for downlink fails, the terminal can receive the scheduled channel (e.g., PDSCH) and report NACK information. Since the terminal does not have a CRC, it does not know whether decoding of the second DCI failed. However, it has the decoding result (e.g., DCI payload) and can interpret the DCI based on the decoding result to transmit and receive the scheduled channel. If decoding of the DCI fails, the terminal may transmit and receive the channel using scheduling information other than the scheduling information originally intended by the base station, and thus, PDSCH reception may not be possible and NACK information may be reported.

[0359] However, the terminal should not perform the operation of combining the next retransmitted signal according to the HARQ process and the previously failed decoding signal (stored in the terminal buffer) to obtain coding gain as before. This is because the PDSCH signal that has failed decoding is received using the information of the inappropriate second DCI, and therefore, when combined with the retransmitted signal, the decoding performance is further reduced. For this reason, the scheduled channel of the second DCI without a CRC should not be combined during HARQ retransmission and is not stored in the terminal buffer.

[0360] Conversely, even if decoding of the second DCI for uplink fails, the terminal may transmit a channel (e.g., PUSCH) scheduled with inappropriate scheduling information, resulting in unnecessary UL interference and unnecessary consumption of terminal processing / transmission power. Therefore, the aforementioned CRC-less second DCI method can be used only for DL ​​DCI.

[0361] Additionally, for polar codes used for PDCCH transmission, decoding performance (e.g., BLER) can be improved by utilizing CRC. If a reduced CRC or CRC-less second DCI according to the aforementioned proposed method is applied, the decoding performance of the second DCI may degrade. To address this, reliability can be improved by setting the PDCCH aggregation level of the second DCI higher or by repeating the PDCCH.

[0362] Additionally, the method of setting / defining / applying the QCL assumption of the second DCI may be as follows.

[0363] Since the PDCCH resources / field configuration / size, etc. of the second DCI have dependencies with the first DCI, the terminal can receive the second PDCCH transmitting the second DCI at or after the time of receiving the first PDCCH transmitting the first DCI. At this time, the two cases described below (hereinafter, Case 1 and Case 2) can be considered depending on the reception time difference between the first PDCCH and the second PDCCH. In this regard, the threshold for the time difference can be defined by standards, etc., set / instructed to the terminal by the base station, or reported to the base station by the terminal.

[0364] - Case 1. (If the time difference is short or less than or equal to the threshold value) The terminal can detect the first PDCCH after buffering the second PDCCH, and decode the second DCI after decoding the first DCI.

[0365] - Case 2. (If the time difference is long or greater than the threshold value) The terminal can detect the first PDCCH without buffering the second PDCCH, and decode the second DCI from the second PDCCH after decoding the first DCI.

[0366] In case 1, the QCL assumption for buffering the second PDCCH can be set semi-statically or statically. For example, the same QCL assumption as the first PDCCH is used / applied for reception, in which case the first DCI and the second DCI can only be transmitted on the same TRP / beam. Alternatively, the TCI state (or QCL RS) for the second PDCCH / SS / CORESET can be separately preset, and the second PDCCH can be buffered using the corresponding TCI state, or a default QCL assumption can be defined / applied. For example, the default QCL assumption can mean an operation of buffering using the QCL assumption set in CORESET 0.

[0367] In case 2, the QCL assumption for the second PDCCH can be dynamically set. For example, if the base station transmits information about the TRP / beam / TCI state / QCL assumption (e.g., QCL RS or QCL type) for transmitting the second DCI through the first DCI, the terminal can receive the second PDCCH / DCI based on this. Here, if the TCI state for the scheduled channel of the second DCI is indicated in the first DCI, the terminal can use the corresponding TCI state to receive the second PDCCH. If there are multiple indicated TCI states, the terminal can use the first or last TCI state among them to receive the second PDCCH. This is because the time difference between the first DCI and the second DCI is sufficient to receive the second DCI after completing decoding for the first DCI.

[0368] As a result, not only the scheduled channel of the second DCI but also the second DCI itself can be transmitted by the second TRP. Here, the second TRP may correspond to a third TRP rather than the first TRP that transmits the scheduled channel of the first DCI. Through this, there is a technical effect in that the corresponding TRP can control information about precoding / power control for not only the second PDSCH but also the second PDCCH by performing cooperative transmission from the PDCCH stage. Additionally, each DCI can individually indicate information about resource allocation (RA), through which an operation similar to the existing M-DCI-based M-TRP transmission can be performed. For example, since the scheduled PDSCH of the first DCI and the first DCI are both transmitted by the first TRP, and the scheduled PDSCH of the second DCI and the second DCI are both transmitted by the second TRP, an operation similar to the existing M-DCI-based M-TRP transmission can be performed. However, unlike the existing M-DCI-based M-TRP transmission, the proposed method described above can reduce blind decoding overhead because blind decoding for the second DCI is not performed, and DCI overhead can be reduced because some common scheduling information is indicated through the first DCI.

[0369] With respect to the proposed method described above, the QCL assumption may be a type D QCL RS for determining the reception beam of the terminal, and may broadly include a type A QCL RS. In addition, for case 1, when the second DCI is received using a semi-static / static method for the type D QCL RS and channel estimation is performed with the DMRS of the second DCI, the terminal may decode the second DCI using the type A QCL RS indicated by the first DCI.

[0370] In Case 2, if the time interval becomes very large, the optimal number of M-TRPs and / or the optimal M-TRP technique at the time of transmitting the first DCI may be different from the optimal number of M-TRPs and / or the optimal M-TRP technique at the time of transmitting the second DCI. Considering this, a method of overriding the number of M-TRPs and the M-TRP technique indicated in the first DCI may be applied in the second DCI. For example, even if the number of M-TRPs and the M-TRP technique indicated in the first DCI are indicated, the second DCI may indicate the number of M-TRPs and the M-TRP technique again, in which case the terminal may apply the value / information indicated by the second DCI.

[0371] FIG. 10 and FIG. 11 illustrate the operation of a first device (e.g., a terminal) and the operation of a second device (e.g., a base station) performing S-TRP / M-TRP transmission and reception based on two-step DCI according to the embodiments of the present disclosure described above.

[0372] FIG. 10 is a drawing for explaining the operation of the first device according to an embodiment of the present disclosure.

[0373] Referring to FIG. 10, a first device may receive a first DCI including information related to whether a transmission mode (e.g., M-TRP transmission) based on a plurality of TCI states is scheduled (S1010).

[0374] If the transmission mode is scheduled, the first device can additionally receive the second DCI (S1020).

[0375] In this regard, a part of the scheduling information for the corresponding transmission mode may be included in the first DCI of step S1010, and the remaining part may be included in the second DCI of step S1020.

[0376] Based on the first DCI and the second DCI, the first device can perform downlink reception / uplink transmission based on the corresponding transmission mode (S1030).

[0377] In contrast, if the transmission mode is not scheduled, the first device may perform downlink reception or uplink transmission based only on scheduling information included in the first DCI.

[0378] For example, based on embodiments of the present disclosure, the first DCI and the second DCI may be configured as follows.

[0379] According to the present disclosure, when the transmission mode is scheduled in N TCI states, the first DCI may include scheduling information related to one TCI state, and the second DCI may include scheduling information related to the remaining N-1 TCI states. In this case, the scheduling information related to the remaining N-1 TCI states may be individually configured for each TCI state within the second DCI.

[0380] In addition, according to the present disclosure, at least one of first information on the number of TCI states for the corresponding transmission mode or second information on the transmission scheme for the corresponding transmission mode may be indicated by the first DCI. Here, at least one of the first information or the second information may be indicated based on a TCI state-related field (e.g., a TCI selection field, a TCI field, etc.) included in the first DCI. In this regard, when a setting for a TCI group is preset / indicated for the first device or a setting for a TCI group is confirmed by the first device, the second information may be indicated based on the TCI state-related field and the setting for the TCI group. In addition, the size of the second DCI may be determined based on at least one of the first information or the second information.

[0381] Additionally, according to the present disclosure, at least one of first information about the number of TCI states for the corresponding transmission mode or second information about the transmission technique for the corresponding transmission mode may be indicated by the second DCI. In this case, the size of the second DCI may be determined based on the maximum number of indicable TCI states and the number of indicable transmission techniques. If the maximum number of indicable TCI states is m, the second DCI may include m-bit bitmap information for indicating whether to use scheduling information for m TCI states.

[0382] Additionally, according to the present disclosure, the scheduling information of the second DCI may have a dependency with the scheduling information of the first DCI. For example, the scheduling information included in the second DCI may be indicated within a range indicated by the scheduling information included in the first DCI, or may be indicated as offset information based on the scheduling information included in the first DCI.

[0383] Additionally, according to the present disclosure, the PDCCH resource for receiving the second DCI can be determined based on information about the PDCCH resource on which the first DCI is received.

[0384] Additionally, according to the present disclosure, the second DCI may include a CRC portion having a smaller number of CRC bits than the first DCI, or may not include a CRC portion.

[0385] Additionally, according to the present disclosure, the QCL assumption for the 2 DCIs may be set based on the reception time difference between the PDCCH for the first DCI and the PDCCH for the second DCI. For example, based on a comparison between the reception time difference and a threshold, the QCL assumption for the second DCI may be set semi-statically or statically, or may be set dynamically via the first DCI.

[0386] The method described in the example of FIG. 10 can be performed by the first device (100) of FIG. 12. That is, the first apparatus of FIG. 10 can be implemented as the first device (100). For example, one or more processors (102) of the first device (100) of FIG. 12 can be configured to receive a first DCI including information related to whether a transmission mode based on a plurality of TCI states is scheduled, additionally receive a second DCI based on the transmission mode being scheduled, and perform downlink reception or uplink transmission based on the transmission mode.

[0387] Furthermore, one or more memories (104) of the first device (100) may store instructions for performing the method described in the example of FIG. 10 or the examples described above when executed by one or more processors (102).

[0388] FIG. 11 is a drawing for explaining the operation of a second device according to an embodiment of the present disclosure.

[0389] Referring to FIG. 11, the second device may transmit a first DCI including information related to whether a transmission mode (e.g., M-TRP transmission) based on multiple TCI states is scheduled (S1110).

[0390] If the transmission mode is scheduled, the second device may additionally transmit a second DCI (S1120).

[0391] In this regard, a part of the scheduling information for the corresponding transmission mode may be included in the first DCI of step S1110, and the remaining part may be included in the second DCI of step S1120.

[0392] Based on the first DCI and the second DCI, the second device can perform downlink transmission / uplink reception based on the corresponding transmission mode (S1130).

[0393] Specific features such as configuration / setting / instruction of specific information included in the first DCI and the second DCI, setting of the size of the second DCI, PDCCH resources for reception of the first DCI / the second DCI, CRC portion for the first DCI / the second DCI, QCL assumption for the first DCI / the second DCI, etc. are the same as the description referring to FIG. 10, so redundant descriptions are omitted.

[0394] The method described in the example of FIG. 11 can be performed by the second device (200) of FIG. 12. That is, the second apparatus of FIG. 11 can be implemented as the second device (200). For example, one or more processors (202) of the second device (200) of FIG. 12 can be configured to transmit a first DCI including information related to whether a transmission mode based on a plurality of TCI states is scheduled, additionally transmit a second DCI based on the transmission mode being scheduled, and perform downlink transmission or uplink reception based on the transmission mode.

[0395] Furthermore, one or more memories (204) of the second device (200) may store instructions for performing the method described in the example of FIG. 11 or the examples described above when executed by one or more processors (202).

[0396] Additionally, in the proposed methods of the present disclosure, ' / ' can be interpreted as 'and', 'or', or 'and / or' depending on the context.

[0397] Additionally, the 'beam' described in the proposed methods of the present disclosure may mean a source RS for a spatial filter or a spatial relation, and may be interpreted as a QCL (type-D) RS, a (DL / UL / joint) TCI state, or a spatial relation RS (in case of UL).

[0398] General devices to which the present disclosure may be applied

[0399] FIG. 12 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.

[0400] Referring to FIG. 12, 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).

[0401] 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.

[0402] 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).

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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 a first downlink control information (DCI) including information related to whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; A step of additionally receiving a second DCI based on the above transmission mode being scheduled; and Including a step of performing downlink reception or uplink transmission based on the above transmission mode, A method wherein a portion of the scheduling information for the above transmission mode is included in the first DCI, and the remaining portion is included in the second DCI.

2. In paragraph 1, Based on the above transmission mode being scheduled into N TCI states, The above first DCI includes scheduling information related to one TCI state, A method wherein the second DCI includes scheduling information related to the remaining N-1 TCI states.

3. In paragraph 2, A method wherein scheduling information related to the remaining N-1 TCI states is individually configured for each TCI state within the second DCI.

4. In paragraph 1, A method wherein at least one of first information about the number of TCI states for the transmission mode or second information about a transmission scheme for the transmission mode is indicated by the first DCI.

5. In paragraph 4, A method wherein at least one of the first information or the second information is indicated based on a TCI status related field included in the first DCI.

6. In paragraph 5, A method wherein the second information is indicated based on the TCI status related field and the settings for the TCI group, based on the settings for the TCI group being preset or confirmed.

7. In paragraph 4, A method wherein the size of the second DCI is determined based on at least one of the first information or the second information.

8. In paragraph 1, A method in which at least one of first information about the number of TCI states for the transmission mode or second information about a transmission scheme for the transmission mode is indicated by the second DCI.

9. In paragraph 8, A method wherein the size of the second DCI is determined based on the maximum number of indicative TCI states and the number of indicative transmission techniques.

10. In paragraph 9, A method wherein the second DCI includes m-bit bitmap information for indicating whether to use scheduling information for m TCI states, based on the maximum number of TCI states that can be indicated above being m.

11. In paragraph 1, A method in which the scheduling information included in the second DCI is indicated within a range indicated by the scheduling information included in the first DCI, or is indicated by offset information based on the scheduling information included in the first DCI.

12. In paragraph 1, A method in which a PDCCH (physical downlink control channel) resource for receiving the second DCI is determined based on information about the PDCCH resource through which the first DCI is received.

13. In paragraph 1, A method wherein the second DCI includes a CRC (cyclic redundancy check) portion having a smaller number of CRC bits than the first DCI or does not include a CRC portion.

14. In paragraph 1, A method wherein the quasi-co location (QCL) assumption for the second DCI is set based on the reception time difference between the PDCCH for the first DCI and the PDCCH for the second DCI.

15. In paragraph 14, A method wherein, based on a comparison between the reception time difference and the threshold, the QCL assumption for the second DCI is set to be semi-static or static, or dynamically set via the first DCI.

16. In paragraph 1, A method comprising the step of performing downlink reception or uplink transmission based on scheduling information included in the first DCI, based on the above transmission mode being unscheduled.

17. 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 a first downlink control information (DCI) including information regarding whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; Based on the above transmission mode being scheduled, a second DCI is additionally received; Set to perform downlink reception or uplink transmission based on the above transmission mode, A device wherein a portion of the scheduling information for the above transmission mode is included in the first DCI, and the remaining portion is included in the second DCI.

18. A step of transmitting a first downlink control information (DCI) including information related to whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; A step of additionally transmitting a second DCI based on the above transmission mode being scheduled; and Including a step of performing downlink transmission or uplink reception based on the above transmission mode, A method wherein a portion of the scheduling information for the above transmission mode is included in the first DCI, and the remaining portion is included in the second DCI.

19. 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 a first downlink control information (DCI) including information regarding whether a transmission mode is scheduled based on a plurality of transmission configuration indicator (TCI) states; Based on the above transmission mode being scheduled, a second DCI is additionally transmitted; Set to perform downlink transmission or uplink reception based on the above transmission mode, A device wherein a portion of the scheduling information for the above transmission mode is included in the first DCI, and the remaining portion is included in the second DCI.

20. 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 for performing a method according to any one of claims 1 to 16 based on execution by said one or more processors.

21. One or more non-transitory computer-readable media storing one or more instructions that are executed by one or more processors to control the performance of a method according to any one of claims 1 to 16.

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