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

Abstract

A method and apparatus for transmitting and receiving a PUSCH in a wireless communication system are disclosed. According to one embodiment of the present disclosure, the method comprises the steps of: receiving configuration information related to PUSCH transmission from a base station, the configuration information including first information for setting a maximum number of layers for a first panel and second information for setting a maximum number of layers for a second panel with respect to multi-panel PUSCH transmission; receiving DCI from a base station, the DCI including an SRS resource set indicator field, a first precoding related field, and a second precoding related field; and transmitting the multi-panel PUSCH to the base station based on the value of the SRS resource set indicator field in the DCI.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving a PUSCH (Physical Uplink Shared Channel) in the wireless communication system. Background Art

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

[0003] The overall requirement for next-generation mobile communication systems is to support the accommodation of explosive data services, significantly increase the transmission rate per user, accommodate a significantly increased number of connected devices, provide very low end-to-end latency, and achieve high energy efficiency. To this end, various technologies have been studied, including dual connectivity, massive multiple-input multiple-output (Massive MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking. Summary of the Invention

[0004] Technical issues

[0005] The technical purpose of the present disclosure is to provide a method and apparatus for transmitting and receiving a PUSCH (Physical Uplink Shared Channel).

[0006] In addition, an additional technical objective of the present disclosure is to provide a method and apparatus for scheduling PUSCH transmission through multiple panels.

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

[0008] Technical Solution

[0009] According to one aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system may include: receiving configuration information related to PUSCH (Physical Uplink Shared Channel) transmission from a base station, wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; receiving downlink control information (DCI) from the base station, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding-related field, and a second precoding-related field; and transmitting the multi-panel PUSCH transmission to the base station based on a value of the SRS resource set indicator field of the DCI. The size of the first precoding-related field is determined to be greater than or equal to a maximum value of a value of the first information and a value of the second information, and the size of the second precoding-related field is determined based on the value of the first information or the value of the second information.

[0010] According to another aspect of the present disclosure, a method performed by a base station may include: transmitting configuration information related to PUSCH (Physical Uplink Shared Channel) transmission to a user equipment (UE), wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; transmitting downlink control information (DCI) to the UE, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding-related field, and a second precoding-related field; and receiving multi-panel PUSCH transmission from the UE based on a value of the SRS resource set indicator field of the DCI. The size of the first precoding-related field is determined to be greater than or equal to a maximum value of a value of the first information and a value of the second information, and the size of the second precoding-related field is determined based on the value of the first information or the value of the second information.

[0011] Technical Effects

[0012] According to an embodiment of the present disclosure, when PUSCH transmission is performed through multiple panels, the number of layers used for PUSCH transmission can be independently supported for each panel.

[0013] In addition, according to the embodiments of the present invention, the signaling overhead for downlink control information for scheduling PUSCH transmission through multiple panels can be reduced.

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

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

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

[0017] Figure 2 FIG2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0018] Figure 3 FIG2 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

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

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

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

[0022] Figure 7 is a diagram illustrating a signaling procedure between a network and a UE for a PUSCH transmission and reception method according to an embodiment of the present disclosure.

[0023] Figure 8 is a diagram illustrating operations of a UE for a PUSCH transmission and reception method according to an embodiment of the present disclosure.

[0024] Figure 9 is a diagram illustrating an operation of a base station for a PUSCH transmission and reception method according to an embodiment of the present disclosure.

[0025] Figure 10 A block diagram of a wireless communication device according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed with the accompanying drawings is intended to describe exemplary embodiments of the present disclosure and is not intended to represent the only embodiment in which the present disclosure may be implemented. The following detailed description includes specific details to provide a complete understanding of the present disclosure. However, those skilled in the relevant art will appreciate that the present disclosure may be implemented without these specific details.

[0027] In some cases, well-known structures and devices may be omitted, or may be shown in the form of a block diagram based on the core functions of each structure and device in order to prevent ambiguity in the concepts of the present disclosure.

[0028] In the present disclosure, when an element is referred to as being "connected," "combined," or "linked" to another element, it may include an indirect connection relationship in which another element exists therebetween as well as a direct connection relationship. In addition, in the present disclosure, the terms "comprising" or "having" specify the presence of the mentioned features, steps, operations, components, and / or elements, but do not preclude the presence or addition of one or more other features, steps, operations, components, elements, and / or groups thereof.

[0029] In the present invention, terms such as "first," "second," etc. are used only to distinguish one element from another and are not used to limit the elements. Unless otherwise specified, they do not limit the order or importance of the elements. Therefore, within the scope of the present disclosure, the first element in one embodiment may be referred to as the second element in another embodiment, and similarly, the second element in one embodiment may be referred to as the first element in another embodiment.

[0030] The terms used in this disclosure are intended to describe specific embodiments rather than to limit the claims. As used in the description of the embodiments and the appended claims, the singular is intended to include the plural, unless the context clearly indicates otherwise. The term "and / or" used in this disclosure may refer to one of the relevant enumerated items, or mean that it refers to and includes any and all possible combinations of two or more of them. In addition, unless otherwise indicated, the " / " between words in the present invention has the same meaning as "and / or".

[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 in which a device (e.g., a base station) controlling the corresponding wireless communication network controls the network and transmits or receives signals, or may be performed in a process in which a terminal associated with the corresponding wireless network transmits or receives signals between the network or the terminal.

[0032] In this disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or signals through the corresponding channel. For example, transmitting a control channel means transmitting control information or control signals through the control channel. Similarly, transmitting a data channel means transmitting data information or data signals through the data channel.

[0033] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, while uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter can be part of the base station, while the receiver can be part of the terminal. In the uplink, the transmitter can be part of the terminal, while the receiver can be part of the base station. The base station can be referred to as the first communication device, and the terminal can be referred to as the second communication device. The term "base station (BS)" can be replaced by terms such as fixed station, Node B, eNB (evolved Node B), gNB (next generation Node B), BTS (base transceiver system), access point (AP), network (5G network), AI (artificial intelligence) system / module, RSU (roadside 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 by terms such as UE (user equipment), MS (mobile station), UT (user terminal), MSS (mobile subscriber station), SS (subscriber station), AMS (advanced mobile station), WT (wireless terminal), MTC (machine type communication) device, M2M (machine to machine) device, D2D (device to device) device, vehicle, RSU (roadside unit), robot, AI (artificial intelligence) module, drone (UAV: unmanned aerial vehicle), AR (augmented reality) device, VR (virtual reality) device, etc.

[0034] The following description can be applied to various radio access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using radio 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 using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A Pro is an advanced version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an advanced version of 3GPP LTE / LTE-A / LTE-A pro.

[0035] For clarity, the description is based on 3GPP communication systems (e.g., LTE-A, NR), but the technical concepts of the present disclosure are not limited thereto. LTE refers to technologies in 3GPP Technical Specifications (TSs) 36.xxx Release 8 and later. Specifically, LTE technologies in 3GPP TS 36.xxx Release 10 or later are referred to as LTE-A, and LTE technologies in 3GPP TS 36.xxx Release 13 or later are referred to as LTE-A Pro. 3GPP NR refers to technologies in TS 38.xxx Release 15 or later. LTE / NR may be referred to as a 3GPP system. "xxx" refers to the detailed number of the standard document. LTE / NR may generally be referred to as a 3GPP system. For background information, terminology, abbreviations, etc. used to describe the present disclosure, reference may be made to matters described in standard documents published prior to the present disclosure. For example, the following documents may be referenced.

[0036] For 3GPP LTE, reference may be made to TS 36.211 (Physical Channels and Modulation), TS 36.212 (Multiplexing and Channel Coding), TS 36.213 (Physical Layer Procedures), TS 36.300 (General Description), and TS 36.331 (Radio Resource Control).

[0037] For 3GPP NR, you can refer to TS 38.211 (Physical Channels and Modulation), TS 38.212 (Multiplexing and Channel Coding), TS 38.213 (Physical Layer Procedures for Control), TS 38.214 (Physical Layer Procedures for Data), TS 38.300 (NR and NG-RAN (Next Generation Radio Access Network) Overall Description), and TS 38.331 (Radio Resource Control Protocol Specification).

[0038] Abbreviations of terms that may be used in the present disclosure are defined as follows.

[0039] - BM: Beam Management

[0040] - CQI: Channel Quality Indicator

[0041] - CRI: Channel State Information-Reference Signal Resource Indicator

[0042] - CSI: Channel State Information

[0043] - CSI-IM: Channel State Information-Interference Measurement

[0044] - CSI-RS: Channel State Information-Reference Signal

[0045] - DMRS: Demodulation Reference Signal

[0046] - FDM: Frequency Division Multiplexing

[0047] - FFT: Fast Fourier Transform

[0048] - IFDMA: Interleaved Frequency Division Multiple Access

[0049] - IFFT: Inverse Fast Fourier Transform

[0050] - L1-RSRP: Layer 1 reference signal received power

[0051] - L1-RSRQ: Layer 1 Reference Signal Received Quality

[0052] - MAC: Media Access Control

[0053] - NZP: Non-Zero Power

[0054] - OFDM: Orthogonal Frequency Division Multiplexing

[0055] - PDCCH: Physical Downlink Control Channel

[0056] - PDSCH: Physical Downlink Shared Channel

[0057] - PMI: Precoding Matrix Indicator

[0058] - RE: Resource Element

[0059] - RI: Rank Indicator

[0060] - RRC: Radio Resource Control

[0061] - RSSI: Received Signal Strength Indicator

[0062] - Rx: Receive

[0063] - QCL: Quasi Co-sited

[0064] -SINR: Signal to Interference and Noise Ratio

[0065] - SSB (or SS / PBCH block): Synchronization signal block (including PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) and PBCH (Physical Broadcast Channel))

[0066] - TDM: Time Division Multiplexing

[0067] - TRP: Transmit and Receive Point

[0068] - TRS: Tracking Reference Signal

[0069] - Tx: Send

[0070] - UE: User Equipment

[0071] - ZP: Zero Power

[0072] Overall system

[0073] As more communication devices require higher capacity, demand is emerging for improved mobile broadband communications compared to existing radio access technologies (RATs). Furthermore, large-scale machine-type communications (MTC), which connects multiple devices and things to provide a variety of services anytime, anywhere, is a major consideration for next-generation communications. Furthermore, discussions are underway to design communication systems that take into account reliability- and latency-sensitive services and terminals. Consequently, the introduction of next-generation RATs, such as eMBB (enhanced mobile broadband communications), mMTC (massive MTC), and URLLC (ultra-reliable low-latency communications), is discussed. For convenience, the corresponding technologies are referred to as NR in this disclosure. NR is an example of a 5G RAT.

[0074] New RAT systems, including NR, use OFDM transmission methods or similar transmission methods. New RAT systems may use OFDM parameters that differ from those of LTE. Alternatively, they may continue to use the parameters of existing LTE / LTE-A but may support a wider system bandwidth (e.g., 100 MHz). Alternatively, a cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets can coexist in a single cell.

[0075] A parameter set corresponds to one subcarrier spacing in the frequency domain. As the reference subcarrier spacing is scaled by an integer N, different parameter sets can be defined.

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

[0077] refer to Figure 1 NG-RAN is configured with gNBs, which provide the control plane (RRC) protocol side for the NG-RA (NG Radio Access) user plane (i.e., the new AS (Access Stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and the UE. gNBs are interconnected via the Xn interface. Furthermore, gNBs are connected to the Next Generation Core (NGC) via the NG interface. More specifically, gNBs are connected to the Access and Mobility Management Function (AMF) (Access and Mobility Management Power) via the N2 interface and to the User Plane Function (UPF) via the N3 interface.

[0078] Figure 2 The diagram illustrates a frame structure in a wireless communication system to which the present disclosure may be applied.

[0079] NR systems can support multiple parameter sets. A parameter set 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, while very low subcarrier spacing is not assumed for very high carrier frequencies, the parameter set used can be selected independently of the frequency band. Furthermore, various frame structures based on multiple parameter sets can be supported in NR systems.

[0080] The following describes the OFDM parameter sets and frame structures that can be considered in the NR system. The multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1 below.

[0081] [Table 1]

[0082]

[0083] NR supports multiple numerologies (or subcarrier spacing (SCS)) for various 5G services. For example, when the SCS is 15kHz, it supports wide areas of traditional cellular bands; when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency, and wider carrier bandwidth; and when the SCS is 60kHz or higher, it supports bandwidths exceeding 24.25GHz to overcome phase noise.

[0084] NR frequency bands are defined as two types of frequency ranges (FR1 and FR2). FR1 and FR2 can be configured as shown in Table 2 below. FR2 can also refer to millimeter waves (mmWave).

[0085] [Table 2]

[0086]

[0087] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed as T c =1 / (Δf max ·N f ) is a multiple of the time unit. Here, Δf max i is 480·10 3 Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) to have duration T f= 1 / (Δf max N f / 100)·T c =10ms radio frame. Here, the radio frame is configured with 10 subframes, each of which has T sf =(Δf max N f / 1000)·T c In this case, there may be one frame set for uplink and one frame set for downlink. In addition, the transmission in the uplink frame numbered i from the terminal should start T earlier than the corresponding downlink frame in the corresponding terminal. TA =(N TA +N TA,offset )T c For subcarrier spacing configuration μ, the time slots in the subframe are n s μ ∈{0,..., N slot subframe,μ -1} and are numbered in increasing order in the radio frame by n s,f μ ∈{0,..., N slot frame,μ -1}. A time slot is configured with N symb slot consecutive OFDM symbols, and N symb slot Determined by CP. Time slot n in a subframe s μ The start of the OFDM symbol n in the same subframe s μ N symb slot All terminals may not perform transmission and reception at the same time, which means that all OFDM symbols of a downlink time slot or an uplink time slot may not be used.

[0088] Table 3 shows the number of OFDM symbols per time slot in normal CP (N symb slot ), the number of time slots per radio frame (N slot frame,μ ) and the number of slots per subframe (N slot subframe,μ ), and Table 4 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0089] [Table 3]

[0090]

[0091] [Table 4]

[0092]

[0093] Figure 2 This is an example of μ=2 (SCS is 60kHz), see Table 3, 1 subframe can include 4 time slots. Figure 2 1 subframe = {1, 2, 4} shown in is an example, and the number of slots that can be included in 1 subframe is as defined in Table 3 or Table 4. In addition, a mini-slot may include 2, 4, or 7 symbols or more or less symbols.

[0094] Regarding the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. The following describes in detail the physical resources that can be considered in the NR system.

[0095] First, regarding antenna ports, they are defined so that the channel carrying symbols in that antenna port can be inferred from the channels carrying other symbols in the same antenna port. When large-scale properties of the channel carrying symbols in one antenna port can be inferred from the channel carrying symbols in another antenna port, the two antenna ports are said to be in a QC / QCL (quasi-co-located or quasi-co-located) relationship. In this case, the large-scale properties include at least one of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0096] Figure 3 The diagram illustrates a resource grid in a wireless communication system to which the present disclosure may be applied.

[0097] refer to Figure 3 , which graphically depicts the resource grid configuration with N in the frequency domain RB μ N sc RB subcarriers, and one subframe is configured with 14·2 μ OFDM symbols, but not limited to this. In the NR system, the transmitted signal consists of 2 μ N symb (μ) OFDM symbols and N RB μ N sc RB Here, N RB μ ≤ N RB max,μ . N RB max,μ represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid can be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, k = 0, ..., N RB μ N sc RB-1 is the index in the frequency domain, and l'=0,...,2 μ N symb (μ) -1 refers to the symbol position in the subframe. When referring to resource elements in a time slot, an index pair (k, l) is used. Here, l = 0, ..., N symb μ -1. The resource element (k, l') for μ and antenna port p corresponds to the complex value a k,l' (p,μ) When there is no risk of confusion or when no specific antenna port or parameter set is specified, the indices p and μ may be dropped and the complex value may be a k,l' (p) or a k,l' In addition, a resource block (RB) is defined as N in the frequency domain. sc RB =12 consecutive subcarriers.

[0098] Point A serves as a common reference point for 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 with the SS / PBCH block, which is used by the terminal for initial cell selection. Assuming a subcarrier spacing of 15 kHz for FR1 and a subcarrier spacing of 60 kHz for FR2, it is expressed in resource blocks.

[0100] - absoluteFrequencyPointA represents the frequency position of point A, expressed in ARFCN (Absolute Radio Frequency Channel Number).

[0101] For subcarrier spacing configuration μ, common resource blocks are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point A". Common resource block number n for subcarrier spacing configuration μ in the frequency domain CRB μ The relationship between and resource elements (k, l) is given by the following formula 1.

[0102] [Formula 1]

[0103]

[0104] In Equation 1, k is defined relative to point A so that k = 0 corresponds to a subcarrier centered at point A. Physical resource blocks are numbered from 0 to N in a bandwidth part (BWP). BWP,i size,μ -1 numbering and i is the number of BWP. Physical resource block n in BWP iPRB and public resource block n CRB The relationship between is given by the following formula 2.

[0105] [Formula 2]

[0106]

[0107] N BWP,i start,μ is the common resource block where the BWP starts relative to common resource block 0.

[0108] Figure 4 The figure illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied. Figure 5 The diagram illustrates a time slot structure in a wireless communication system to which the present disclosure may be applied.

[0109] refer to Figure 4 and Figure 5 , a slot includes multiple symbols in the time domain. For example, for a normal CP, 1 slot includes 7 symbols, but for an extended CP, 1 slot includes 6 symbols.

[0110] A carrier consists of multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as multiple consecutive (physical) resource blocks in the frequency domain and can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed via activated BWPs, and only one BWP can be activated for a terminal. In the resource grid, each element is called a resource element (RE) and can map a complex symbol.

[0111] In NR systems, each component carrier (CC) can support up to 400 MHz. If a terminal operating in such a wideband CC always keeps the radio frequency (RF) chip turned on for the entire CC, terminal battery consumption may increase. Alternatively, when considering multiple use cases operating in a wideband CC (e.g., eMBB, URLLC, MMTC, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) can be supported in each frequency band within the corresponding CC. Alternatively, each terminal may have different maximum bandwidth capabilities. To account for this, the base station can instruct the terminal to operate only in a portion of the bandwidth, rather than the full bandwidth of the wideband CC. For convenience, this portion of bandwidth is defined as a bandwidth part (BWP). A BWP can be configured with contiguous RBs on the frequency axis and can correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / mini-slot duration).

[0112] Furthermore, a base station can configure multiple BWPs even within a CC assigned to a terminal. For example, a BWP occupying a relatively small frequency range can be configured in a PDCCH monitoring timeslot, while the PDSCH indicated by the PDCCH can be scheduled in a larger BWP. Alternatively, when a UE is congested in a specific BWP, other BWPs can be configured for some terminals for load balancing. Alternatively, to account for frequency-domain inter-cell interference cancellation between neighboring cells, some full-bandwidth middle spectrum can be excluded, and two edge BWPs can be configured in the same timeslot. In other words, a base station can configure at least one DL / UL BWP for a terminal associated with a wideband CC. The base station can activate at least one of the configured DL / UL BWPs at a specific time (via L1 signaling, MAC CE (Control Element), or RRC signaling). Furthermore, the base station can instruct (via L1 signaling, MAC CE, or RRC signaling) a switch to another configured DL / UL BWP. Alternatively, a timer can be used to switch to a specific DL / UL BWP upon expiration. Here, the activated DL / UL BWP is defined as the active DL / UL BWP. However, when the terminal performs the initial access procedure or establishes the RRC connection, the configuration on the DL / UL BWP may not be received, so the DL / UL BWP assumed by the terminal in these cases is defined as the initial active DL / UL BWP.

[0113] Figure 6 Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0114] In wireless communication systems, terminals receive information from base stations via downlinks and transmit information to base stations via uplinks. The information transmitted and received by base stations and terminals includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and receive.

[0115] When a terminal is turned on or newly enters a cell, it performs an initial cell search (S601), including synchronization with the base station. During the initial cell search, the terminal synchronizes with the base station by receiving the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) from the base station and obtains information such as the cell identifier (ID). The terminal then obtains broadcast information in the cell by receiving the Physical Broadcast Channel (PBCH) from the base station. Furthermore, during the initial cell search phase, the terminal can check the downlink channel status by receiving the Downlink Reference Signal (DL RS).

[0116] The terminal that has completed the initial cell search may obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried in the PDCCH ( S602 ).

[0117] Meanwhile, when a terminal first accesses a base station or has no radio resources for signal transmission, it may perform a random access (RACH) procedure with the base station (S603 to S606). During the random access procedure, the terminal may transmit a specific sequence as a preamble via the physical random access channel (PRACH) (S603 and S605), and may receive a response message to the preamble via the PDCCH and corresponding PDSCH (S604 and S606). The contention-based RACH may also perform a contention resolution procedure.

[0118] After performing the above-described process, the terminal can then perform PDCCH / PDSCH reception (S607) and PUSCH (Physical Uplink Shared Channel) / PUCCH (Physical Uplink Control Channel) transmission (S608) as a general uplink / downlink signal transmission process. Specifically, the terminal receives downlink control information (DCI) via the PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and its format varies depending on its intended use.

[0119] At the same time, the control information sent by the terminal to the base station via the uplink or received by the terminal from the base station includes downlink / uplink ACK / NACK (acknowledgement / non-acknowledgement) signals, CQI (channel quality indicator), PMI (precoding matrix indicator), RI (rank indicator), etc. For the 3GPP LTE system, the terminal can send the above-mentioned CQI / PMI / RI and other control information via PUSCH and / or PUCCH.

[0120] Table 5 shows an example of the DCI format in the NR system.

[0121] [Table 5]

[0122]

[0123] Referring to Table 5, DCI formats 0_0, 0_1, and 0_2 may include resource information (e.g., UL / SUL (supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), information related to transport blocks (TBs) (e.g., MCS (modulation coding and scheme), NDI (new data indicator), RV (redundancy version)), etc.), information related to HARQ (hybrid automatic repeat and request) (e.g., process number, DAI (downlink assignment index), PDSCH-HARQ feedback timing, etc.), information related to multi-antennas (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information related to PUSCH scheduling (e.g., PUSCH power control, etc.), and control information included in each DCI format may be predefined.

[0124] DCI format 0_0 is used to schedule the PUSCH in one cell. Information included in DCI format 0_0 is a CRC (Cyclic Redundancy Check) scrambled by C-RNTI (Cell Radio Network Temporary Identifier), CS-RNTI (Configured Scheduling RNTI), or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI), and is transmitted.

[0125] DCI format 0_1 is used to indicate the scheduling of one or more PUSCHs or to configure grant (CG) downlink feedback information to terminals in a cell. The information included in DCI format 0_1 is scrambled and transmitted using C-RNTI, CS-RNTI, SP-CSI-RNTI (semi-persistent CSI RNTI), or MCS-C-RNTI.

[0126] DCI format 0_2 is used to schedule a PUSCH in one cell. Information included in DCI format 0_2 is scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI and transmitted.

[0127] Next, DCI formats 1_0, 1_1, and 1_2 may include resource information (e.g., frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.), information related to transport blocks (TBs) (e.g., MCS, NDI, RV, etc.), information related to HARQ (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., antenna port, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), information related to PUCCH scheduling of PDSCH (e.g., PUCCH power control, PUCCH resource indicator, etc.), and the control information included in each DCI format may be predefined.

[0128] DCI format 1_0 is used to schedule a PDSCH in one DL cell. Information included in DCI format 1_0 is a CRC scrambled and transmitted by a C-RNTI, a CS-RNTI, or an MCS-C-RNTI.

[0129] DCI format 1_1 is used to schedule a PDSCH in one cell. Information included in DCI format 1_1 is a CRC scrambled and transmitted by a C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0130] DCI format 1_2 is used to schedule PDSCH in a cell. The information included in DCI format 1_2 is a CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0131] Quasi-co-sited (QCL)

[0132] Antenna ports are defined so that the channel on which symbols in that antenna port are transmitted can be inferred from the channels on which other symbols in the same antenna port are transmitted. When the properties of the channel carrying symbols in one antenna port can be inferred from the channels carrying symbols in other antenna ports, the two antenna ports are said to be in a QC / QCL (quasi-co-located or quasi-co-located) relationship.

[0133] Here, the channel attributes include at least one of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, or spatial RX parameters. Here, spatial Rx parameters refer to spatial (Rx) channel attribute parameters such as arrival angle.

[0134] A terminal may configure a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config to decode PDSCH from a detected PDCCH with the expected DCI for the corresponding terminal and a given serving cell. M depends on the UE capabilities.

[0135] Each TCI-State includes parameters for configuring a quasi-co-location relationship between one or two DL reference signal ports and the DM-RS of the PDSCH.

[0136] The quasi co-location relationship is configured by the higher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 (if configured) for the second DL RS. For two DL RSs, the QCL type is different regardless of whether the reference is the same DL RS or different DL RSs.

[0137] 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.

[0138] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0139] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0140] - "QCL-TypeC": {Doppler shift, average delay}

[0141] - "QCL-TypeD": {Spatial Rx parameters}

[0142] For example, when the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port may be instructed / configured to be quasi-co-located with a specific TRS with respect to QCL-Type A and quasi-co-located with a specific SSB with respect to QCL-Type D. A terminal that receives such an instruction / configuration can receive the corresponding NZP CSI-RS TRS using the Doppler and delay values measured in QCL-Type A and apply the Rx beam used for receiving QCL-Type D SSBs to receive the corresponding NZP CSI-RS.

[0143] The UE may receive an activation command via MAC CE signaling, which is used to map up to 8 TCI states to code points of the DCI field "Transmission Configuration Indication".

[0144] Operations related to multiple TRPs

[0145] Coordinated Multi-Point (CoMP) is a scheme in which multiple base stations exchange (for example, using the X2 interface) or utilize channel information (such as RI / CQI / PMI / LI (Layer Indicator)) fed back by terminals and cooperatively transmit it to the terminals to effectively control interference. Depending on the scheme used, CoMP can be categorized into joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), dynamic point blocking (DPB), and others.

[0146] The M-TRP transmission scheme in which M TRPs send data to one terminal can be mainly classified into i) eMBB M-TRP transmission, a scheme for improving the transmission rate, and ii) URLLC M-TRP transmission, a scheme for increasing the reception success rate and reducing the delay.

[0147] In addition, regarding DCI transmission, M-TRP transmission schemes can be classified into i) M-TRP transmission based on M-DCI (multiple DCIs), where each TRP transmits different DCIs, and ii) M-TRP transmission based on S-DCI (single DCI), where one TRP transmits DCI. For example, for S-DCI-based M-TRP transmission, all scheduling information about data transmitted by M TRPs should be delivered to the terminal through one DCI, which can be used in an ideal backhaul (ideal BH) environment where dynamic cooperation between two TRPs is possible.

[0148] The UE can recognize the PUSCH (or PUCCH) scheduled by DCI received in different control resource sets (CORESETs) (or CORESETs belonging to different CORESET groups) as a PUSCH (or PUCCH) sent to a different TRP, or can recognize the PDSCH (or PDCCH) from a different TRP. In addition, the method described below for UL transmissions (e.g., PUSCH / PUCCH) sent to different TRPs can be equally applied to UL transmissions (e.g., PUSCH / PUCCH) sent to different panels belonging to the same TRP.

[0149] Hereinafter, a CORESET group ID described / mentioned in this disclosure may refer to an index / identification information (e.g., ID, etc.) for distinguishing a CORESET for each TRP / panel. Furthermore, a CORESET group may be a group / union of CORESETs distinguished by an index / identification information (e.g., ID) / CORESET group ID, etc., for distinguishing a CORESET for each TRP / panel. In an example, the CORESET group ID may be specific index information defined in the CORESET configuration. In this case, the CORESET group may be configured / indicated / defined by an index defined in the CORESET configuration for each CORESET. Additionally / alternatively, the CORESET group ID may refer to an index / identification information / indicator, etc., for distinguishing / identifying CORESETs configured / associated with each TRP / panel. Hereinafter, the CORESET group ID described / mentioned in this disclosure may be replaced with a specific index / identification information / indicator for distinguishing / identifying CORESETs configured / associated with each TRP / panel. A CORESET group ID, i.e., a specific index, identification information, or indicator for distinguishing or identifying the CORESETs associated with each TRP / panel, may be configured or indicated to the terminal via higher layer signaling (e.g., RRC signaling), Layer 2 signaling (e.g., MAC-CE), Layer 1 signaling (e.g., DCI), or the like. In an example, PDCCH detection may be performed per TRP / panel (i.e., per TRP / panel belonging to the same CORESET group) for each CORESET group. Additionally or alternatively, uplink control information (e.g., CSI, HARQ-A / N (ACK / NACK), SR (scheduling request)) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) may be separated and managed / controlled per TRP / panel (i.e., per TRP / panel belonging to the same CORESET group) for each CORESET group. Additionally / alternatively, HARQ A / N (processing / retransmission) for PDSCH / PUSCH, etc. scheduled per TRP / panel may be managed per corresponding CORESET group (ie, per TRP / panel belonging to the same CORESET group).

[0150] For example, a higher-layer parameter, the ControlResourceSet information element (IE), is used to configure a time / frequency control resource set (CORESET). In an example, a control resource set (CORESET) may be associated with the detection and reception of downlink control information. The ControlResourceSet IE may include, for example, a CORESET-related ID (e.g., controlResourceSetID), an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex), the time / frequency resource configuration of the CORESET, and TCI information associated with the CORESET. In an example, the CORESET pool index (e.g., CORESETPoolIndex) may be configured as 0 or 1. In the description, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (e.g., CORESETPoolIndex).

[0151] Release 17 NR standard supports (1) MTRP PDCCH retransmission, (2) MTRP PDCCH single frequency network (SFN) transmission, (3) MTRP PDSCH SFN transmission, (4) MTRP PUSCH retransmission based on S-DCI, and (5) MTRP PUCCH retransmission based on single PUCCH resource. These transmission techniques are URLLC target enhancements for improving reliability, and the same content (i.e., DCI or UL / DL TB or UCI) is repeatedly transmitted. In the case of MTRP PDCCH retransmission, it is repeatedly transmitted in TDM or FDM, MTRP PDCCH / PDSCH SFN is repeatedly transmitted at the same time / frequency / layer, MTRP PUSCH retransmission based on S-DCI is repeatedly transmitted in TDM, and MTRP PUCCH retransmission based on single PUCCH resource is repeatedly transmitted in TDM.

[0152] (1) MTRP PDCCH repeated transmission

[0153] For MTRP PDCCH retransmission, the UE is configured with multiple CORESETs with different TCI states (i.e., different QCL RSs), and the UE is configured with multiple SS sets, each of which is connected / associated to the corresponding CORESET. The base station instructs / configures the UE that the search space set (SS set) associated with one CORESET is linked with the SS set associated with another CORESET for retransmission, so that the UE knows that the PDCCH candidates of the corresponding SS set are repeatedly sent.

[0154] For example, assume that two CORESETs, CORESET 0 and 1, are configured for a UE, and CORESET 0 and 1 are associated with SS sets 0 and 1, respectively, and SS sets 0 and 1 are linked. The UE can recognize that the PDCCH candidate of SS set 0 and the PDCCH candidate of SS set 1 are repeatedly transmitting the same DCI, and through a specific rule, the UE can recognize that a specific PDCCH candidate of SS set 0 and a specific PDCCH candidate of SS set 1 are a pair established for repeatedly transmitting the same DCI. These two PDCCH candidates are called linked PDCCH candidates, and if the UE correctly receives either of the two PDCCH candidates, the UE can successfully decode the corresponding DCI. However, when receiving the PDCCH candidate of SS set 0, the QCL RS (i.e., DL beam) of the TCI state associated to COERSET 0 of SS set 0 is used, and when receiving the PDCCH candidate of SS set 1, the QCL RS (i.e., DL beam) of the TCI state associated to COERSET 1 of SS set 1 is used, thereby receiving linked PDCCH candidates with different beams.

[0155] (2) MTRP SFN PDCCH repeated transmission

[0156] As a special case of MTRP PDCCH retransmission, multiple TRPs can repeatedly send the same DCI over the same time / frequency / DMRS port, which can be called SFN PDCCH transmission. However, for SFN PDCCH transmission, instead of configuring multiple CORESETs with different TCI states for the UE, the base station sets multiple TCI states to one CORESET. When the UE receives a PDCCH candidate through an SS set associated with a CORESET, it performs channel estimation on the PDCCH DMRS using all multiple TCI states and attempts to decode it.

[0157] (3) MTRP SFN PDSCH repeated transmission

[0158] When the MTRP PDSCH is repeatedly transmitted, the two TRPs repeatedly transmit the corresponding PDSCH on different resources. However, as a special case, if the resources used by the two TRPs are the same, that is, if the same channel is repeatedly transmitted through the same frequency, time, and layer (that is, DMRS port), the reliability of the corresponding channel can be improved. In this case, the repeatedly transmitted same channel is received by combining over the air, and because the resources are not distinguished, it is recognized as one channel from the receiver's perspective. For PDSCH SFN transmission, two DL TCI states for PDSCH DMRS reception can be configured.

[0159] (4) MTRP PUSCH repeated transmission based on S-DCI

[0160] For S-DCI-based MTRP PUSCH transmission, the base station configures two SRS sets for the UE, one for each UL Tx port and UL beam / QCL information for TRP 1 and TRP 2, respectively. Furthermore, the base station uses two SRI fields in a single DCI to indicate SRS resources for each SRS set, and can indicate up to two power control (PC) parameter sets. For example, the first SRI field can indicate the SRS resources and PC parameter set defined in SRS set 0, while the second SRI field can indicate the SRS resources and PC parameter set defined in SRS set 1. The UE is informed of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 1 via the first SRI field, and uses this information to perform a PUSCH transmission at the transmission opportunity (TO) corresponding to SRS set 0. Similarly, the UE is informed of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 2 via the second SRI field, and performs a PUSCH transmission at the TO corresponding to SRS set 1. Similarly, the UE is indicated by the second SRI field with the UE UL Tx port, PC parameter set, and UL beam / QCL information for TRP 2, and performs PUSCH transmission in the TO corresponding to SRS set 1. Here, the TOs corresponding to SRS sets 0 and 1 are determined using one of the mapping methods configured by the base station: cyclic (beam) mapping and sequential (beam) mapping. For example, in the case of cyclic beam mapping, SRS sets 0 and SRS sets 1 are mapped alternately in TO order. For example, if TO = 4, TOs 1, 2, 3, and 4 are mapped to SRS sets 0, 1, 0, and 1, respectively. Sequential beam mapping, on the other hand, maps one SRS set to two adjacent TOs and then maps another SRS set to the next two adjacent TOs. For example, when TO = 8, TOs 1, 2, 3, 4, 5, 6, 7, and 8 are mapped to SRS sets 0, 0, 1, 1, 0, 0, 1, and 1, respectively. This mapping method is also applied to PUCCH repetition.

[0161] In addition to the SRI field, the PMI (TPMI), Phase Tracking Reference Signal (PTRS), and Transmit Power Control (TPC) fields can also be transmitted for each Transmitted Resource Plan (TRP) indication, expanding the existing one field to two. Furthermore, by introducing a 2-bit SRS Resource Set Indicator field, STRP PUSCH retransmissions can be performed by selecting a specific one of two SRS sets, and MTRP PUSCH retransmissions can be performed by selecting both. Specifically, if this field is 00 or 01, it indicates SRS set 0 and SRS set 1, respectively, and STRP PUSCH transmissions are performed for each SRS set. If it is 10, it indicates (SRS set 0, SRS set 1), and MTRP PUSCH transmissions are performed in the order of the indicated SRS set pairs. In other words, set 0 corresponds to the first PUSCH TO. If it is 11, it indicates (SRS set 1, SRS set 0), and MTRP PUSCH transmissions are performed in the order of the indicated set pairs. In other words, set 1 corresponds to the first PUSCH TO.

[0162] (5) MTRP PUCCH repeated transmission based on a single PUCCH resource

[0163] The base station activates / configures two spatial relationship information in a single PUCCH resource for the UE for MTRP PUCCH transmission based on a single PUCCH resource. In this case, in the case of FR1, two PC (power control) parameter sets can be activated / configured. When the UE sends UL UCI through the corresponding PUCCH resource, each spatial relationship information is used to indicate the spatial relationship information toward TRP 1 and TRP 2, respectively. For example, the Tx beam / PC parameters toward TRP 1 are indicated to the UE by the value indicated in the first spatial relationship information, and the UE uses this information to perform PUCCH transmission in the TO corresponding to TRP 1. Similarly, the Tx beam / PC parameters toward TRP 2 are indicated to the UE by the value indicated in the second spatial relationship information, and the UE uses this information to perform PUCCH transmission in the TO corresponding to TRP 2.

[0164] In addition, for MTRP PUCCH repeated transmission, the configuration method has been improved so that two sets of spatial relationship information can be configured in the PUCCH resources. That is, if PC parameters such as PLRS, Alpha, P0, and closed-loop index are set for each spatial relationship information, the spatial relationship RS can be configured. As a result, the PC information and spatial relationship RS information corresponding to two TRPs can be configured through two spatial relationship information. The UE uses the first spatial relationship information to send UCI (i.e., CSI, HARQ-ACK, Scheduling Request (SR)) in PUCCH in TO 1, and uses the second spatial relationship information to send the same UCI (i.e., CSI, HARQ-ACK, SR) in PUCCH in TO 2. In the present disclosure, a PUCCH resource with two sets of spatial relationship information is referred to as an MTRP PUCCH resource, and a PUCCH resource with one set of spatial relationship information is referred to as a STRP PUCCH resource.

[0165] In the method proposed in the present disclosure, using (or mapping) a specific TCI state (or TCI) when receiving data / DCI / UCI for a specific frequency / time / space resource may mean, in the DL case, estimating the channel from the DMRS using the QCL type and QCL RS indicated by the corresponding TCI state in the frequency / time / space resource, and receiving / demodulating the data / DCI using the estimated channel. In the UL case, this may mean transmitting / modulating the DMRS and data / UCI using the Tx beam and / or Tx power indicated by the corresponding TCI state in the frequency / time / space resource.

[0166] The UL TCI state includes the UE's Tx beam and / or Tx power information and can be configured for the UE through other parameters such as spatial relationship information instead of the TCI state. The UL TCI state can be directly indicated in the UL grant DCI, or it can mean the spatial relationship information of the SRS resource indicated by the SRS resource indicator (SRI) field of the UL grant DCI. Alternatively, it can mean the open-loop (OL) Tx power control parameters linked to the value indicated by the SRI field of the UL grant DCI (j: index for open-loop parameters Po and alpha (up to 32 parameter value sets per cell), q_d: index of the DL RS used for path loss (PL) measurement (up to 3 measurements per cell), l: closed-loop power control process index (up to 2 processes per cell)).

[0167] Furthermore, Release 17 now allows not only DL TCI status but also UL TCI status to be indicated via DL DCI (e.g., DCI formats 1-1 or 1-2), or it allows for the indication of only the UL TCI status without any DL TCI status indication. Consequently, the existing Release 15 / 16 methods for UL beam and PC (power control) configuration have been replaced in Release 17 with a UL TCI status indication method. More specifically, Release 17 allows for the indication of a UL TCI status via the TCI field of the DL DCI. After a certain time, known as the beam application time, the corresponding UL TCI status is applied to all PUSCHs and all PUCCHs, and to some or all of the indicated SRS resource sets.

[0168] Release 18 also discusses methods for UEs to simultaneously transmit multiple channels / reference signals (RS) of the same type or multiple channels / RSs of different types. Existing UEs have limitations on transmitting multiple channels / RSs simultaneously (for example, multiple SRS resources from different SRS sets can be transmitted simultaneously for UL beamforming, but multiple PUSCHs cannot be transmitted simultaneously). However, in future advanced UEs, this limitation will be relaxed, allowing simultaneous transmission of multiple channels or RSs using multiple transmission panels. This transmission method is referred to as simultaneous transmission across multiple panels (STxMP), and such UEs may also be referred to as STxMP UEs. For example, two PUSCHs corresponding to two UL TBs may be scheduled on the same resources, and PUSCH 1 and 2 transmissions may be configured with spatial relationship RS 1 and PC parameter set 1 (i.e., UL TCI state 1), and spatial relationship RS 2 and PC parameter set 2 (i.e., UL TCI state 2), respectively. In this case, the UE can transmit PUSCH 1 using panel 1 corresponding to UL TCI state 1, while simultaneously transmitting PUSCH 2 using panel 2 corresponding to UL TCI state 2.

[0169] When the base station schedules PUSCH via DCI, it can indicate whether the PUSCH will be transmitted as STxMP, single panel, MTRPPUSCH repetition, etc. Of course, the UE must have STxMP capability and must have enabled STxMP mode in advance through RRC signaling, etc. To this end, the existing SRS resource set indication field can be redefined and used, or a new DCI field can be introduced.

[0170] For ease of explanation, this disclosure assumes collaborative transmission / reception between two TRPs and applies the proposed method, but it can be extended to a multi-TRP environment with three or more TRPs and a multi-panel environment. Different TRPs can be identified by the UE as different TCI states, and when the UE receives / transmits data / DCI / UCI using TCI state 1, it means that the UE receives / transmits data / DCI / UCI from / to TRP 1.

[0171] In this disclosure, a transmission opportunity (TO) may refer to each channel transmitted at a different time when using time-division multiplexing (TDM) or each channel transmitted on a different frequency / RB when using frequency-division multiplexing (FDM) or each channel transmitted on a different layer / beam / DMRS port when using sequence-division multiplexing (SDM). One TCI state can be mapped to each TO. When the same channel is transmitted repeatedly, the complete DCI / data / UCI is sent to one TO, and the receiving end can receive multiple TOs to increase reception success rate.

[0172] Multi-TB PUSCH / PDSCH scheduling based on a single DCI (SDCI)

[0173] Rel-17 NR supports a method in which a single DCI schedules multiple PUSCHs / PDSCHs simultaneously in ultra-high frequency bands (e.g., above 5.26 GHz). For example, multiple TDRAs (=TOs) can be indicated at once via the Time Domain Resource Allocation (TDRA) field of the PUSCH-scheduled DCI, and a different TB can be transmitted for each TO via the PUSCH. In this case, the corresponding DCI's Frequency Domain Resource Allocation (FDRA), Modulation and Coding Scheme (MCS), Transmit Precoding Matrix Indicator (TPMI) (or precoding information and number of layers), and Sounding Resource Indicator (SRI) value can be applied commonly to multiple scheduled TBs. Additionally, the New Data Indicator (NDI) and Redundancy Version (RV) for each TB can be separately indicated via the DCI. While a single value is indicated for the HARQ process number, the HARQ process number can increase sequentially in TO (time) order based on the initial TO.

[0174] Simultaneous transmission across multiple panels (STxMP)

[0175] In Rel-18, discussions are underway to introduce a method for UEs to simultaneously transmit multiple channels / reference signals (RS) of the same type or multiple channels / RSs of different types. For existing UEs, the ability to transmit multiple channels / RSs simultaneously (i.e., in the same time resource) is limited (for example, multiple SRS resources from different SRS resource sets can be transmitted simultaneously for UL beam measurement, but multiple PUSCHs cannot be transmitted simultaneously). However, for future advanced UEs, this restriction will be relaxed, allowing simultaneous transmission of multiple channels or RSs using multiple transmission panels. This operation is referred to as simultaneous transmission across multiple panels (STxMP), and UEs supporting this operation are referred to as STxMP UEs. For example, two PUSCHs (PUSCH 1 and PUSCH 2) corresponding to (carrying) two UL TBs can be scheduled in the same resource element (RE) (or multiple identical REs). Spatial relationship RS 1 and power control (PC) parameter set 1 (i.e., UL TCI state 1) can be configured for PUSCH 1, and spatial relationship RS 2 and PC parameter set 2 (i.e., UL TCI state 2) can be configured for PUSCH 2 transmissions. The UE can transmit PUSCH 1 using panel 1 corresponding to UL TCI state 1, and transmit PUSCH 2 using panel 2 corresponding to UL TCI state 2 at the same time.

[0176] When scheduling PUSCH via DCI, the base station can indicate whether PUSCH will be sent as STxMP, as a single panel, or as M-TRP PUSCH repetitions. In this case, the UE must have STxMP capabilities and can enable STxMP mode (e.g., SDM scheme / mode or SFN scheme / mode) in advance through higher layer signaling (e.g., RRC signaling). To this end, the existing SRS resource set indication field can be redefined and used, or a new DCI field can be introduced.

[0177] Two approaches are being considered for Rel-18 STxMP transmission technology: single frequency network (SFN) and spatial division multiplexing (SDM).

[0178] The SFN method refers to a method in which the same channel (or RS) transmitted by one panel is also sent by another panel. However, since the UL channel (or RS) of each panel is different, it is transmitted using a different precoder, different transmission power, and different transmission beams (i.e., the spatial relationship RS indicated by the UL TCI) for each panel to take this into account.

[0179] The SDM method is a method capable of transmission from rank 2 or higher, in which some layers are transmitted by panel 1 and the remaining layers are transmitted by panel 2. For example, in 2-layer transmission, the first layer can be transmitted by panel 1, and the second layer can be transmitted by panel 2. In this case, since the UL channel of each panel is different, different precoders, different transmission powers, and different transmission beams (that is, spatial relationships RS indicated by UL TCI) are used for transmission by each panel.

[0180] Method for scheduling STxMP transmission

[0181] The 3GPP meeting reached the following conclusions regarding STxMP:

[0182] For dynamic switching between SDM mode for STxMP PUSCH and sTRP (single TRP) transmission based on a single DCI:

[0183] - Dynamically indicate sTRP or SDM transmission using the 2-bit "SRS resource set indicator" field in the DCI.

[0184] For Maximum number of layers transmitted by sTRP, select the following options:

[0185] - Option 1: The maximum number of layers used for sTRP transmission can be configured via maxRank (or Lmax) in the current specification.

[0186] - Option 2: In addition to the current specification's maxRank, an additional maximum number of tiers for sTRP transmission can be set.

[0187] For Maximum number of layers transmitted by SDM, select the following options:

[0188] - Alt 1: A single maximum number of layers can be configured (separate from the maximum number of layers for sTRP), which applies to the first SRS resource set and the second SRS resource set separately.

[0189] - Alt 2: maxRank (or Lmax) in the current specification can also be applied to the first SRS resource set and the second SRS resource set, respectively.

[0190] - Alt 3: There is no configuration specifically for SDM, and the maximum number of layers for sTRP and UE capability report for SDM can be used to determine the maximum number of layers for SDM transmission.

[0191] - Alt 4: The maximum number of layers of the above options 1 / 2 can be applied to the first SRS resource set and the second SRS resource set respectively.

[0192] As described in the above protocol, STxMP transmission or sTRP transmission can be indicated by the SRS resource set indicator field of the DCI. Here, as described above, to configure STxMP transmission, the STxMP mode / method (e.g., SDM mode / method or SFN mode / method) can be configured through higher-layer signaling, and when the STxMP mode / method is configured, the STxMP transmission can be indicated by the SRS resource set indicator field. Uplink transmission (e.g., PUSCH) scheduled by DCI including the SRS resource set indicator field indicating STxMP transmission can be referred to as STxMP uplink transmission or multi-panel uplink transmission.

[0193] For example, when the value of the SRS resource set indicator field is 00 or 01, sTRP transmission may be indicated. In this case, even if two precoding information and layer number fields in the DCI give two transport precoding matrix indicators (TPMIs) (in the case of codebook-based UL transmission) (and two SRIs are given by the two SRS resource indication fields), the second TPMI is retained (or the second SRI is retained), and the first TPMI may be used to indicate the precoder to be applied to one or more layers {0…v1-1}. In addition, similarly, even if two SRS resource indication fields in the DCI give two SRIs (in the case of non-codebook-based UL transmission), the second SRI is retained, and the first SRI may be used to indicate resources associated with one or more layers {0…v1-1}.

[0194] As another example, when the value of the SRS Resource Set Indicator field is 10 (or 11), STxMP (SDM transmission or SFN transmission) transmission may be indicated. In this case, two TPMIs are given by the two precoding information and layer number fields in the DCI (in the case of codebook-based UL transmission) (and two SRIs are given by the two SRS Resource Indication fields), and the first TPMI is used to indicate the precoder to be applied to one or more layers {0…v1-1} corresponding to the SRS resources selected by the corresponding SRI (the first SRI or the second SRI), and the second TPMI can be used to indicate the precoder to be applied to one or more layers {v1…v2+v1-1} corresponding to the SRS resources selected by the corresponding SRI (the second SRI or the first SRI). Here, v1 and v2 can be configured / determined to have different values. Similarly, (in the case of non-codebook-based UL transmission) the two SRS resource indication fields in the DCI give two SRIs, the first SRI can be used to indicate resources associated with one or more layers {0...v1-1}, and the second SRI can be used to indicate resources associated with one or more layers {v1...v2+v1-1}. Here, v1 and v2 can be configured / determined to different values.

[0195] According to Alt 2 of the above protocol, a new maxRank (or Lmax) value is configured for each panel via RRC signaling (i.e., maxRank 1 for panel 1 and maxRank 2 for panel 2), and for STRP (= non-STxMP) transmission, a legacy maxRank value (i.e., maxRank) is configured for each panel via RRC signaling. In other words, a different maxRank value can be configured for each panel.

[0196] Here, different panels can be mapped to different SRS resource sets or SRS resources and used for different SRS resource sets or SRS resources. For example, SRS resource set 0 can be configured to indicate the antenna port corresponding to the first transmission panel of the UE, and SRS resource set 1 can be configured to indicate the antenna port corresponding to the second transmission panel of the UE.

[0197] maxRank corresponds to a higher layer parameter / signaling for configuring the maximum transmission rank of STRP PUSCH transmission, and in the case of SMxMP PUSCH transmission, maxRank 1 for PUSCH transmission of panel 1 and maxRank 2 for PUSCH transmission of panel 2 can be configured separately. Here, since the values of maxRank 1 and maxRank 2 are configured separately, they can be configured to different values. In addition, Lmax can be given by a higher layer parameter (e.g., maxMIMO-Layers), which indicates the maximum number of MIMO layers used for PUSCH in all BWPs of the corresponding UL of the serving cell, or for non-codebook based operation, Lmax can be given by the maximum number of PUSCH layers supported by the UE for the serving cell.

[0198] In this case, since a different maximum number of layers can be configured for each panel, the precoder / number of layers for each panel can also be determined differently for each panel. Therefore, in order to support different maximum numbers of layers for each panel, the number of precoders / number of layers used for each panel is indicated by a corresponding field in the DCI, and in order to reduce the signaling overhead of the corresponding field in the DCI, the size of the corresponding field in the DCI needs to be appropriately defined / configured.

[0199] Therefore, the present disclosure proposes a method for determining the size of the first and second TPMI fields of scheduling DCI (e.g., DCI formats 0-1 and 0-2) for codebook-based PUSCH transmissions. Furthermore, the present disclosure proposes a method for determining the size of the first and second SRI fields of scheduling DCI for non-codebook-based PUSCH transmissions.

[0200] In the following description of this disclosure, the TPMI is given by the precoding information and layer number fields, but for ease of explanation, the precoding information and layer number fields are simply referred to as the TPMI field. In addition, the SRI is given by the SRS resource indication field, but for ease of explanation, the SRS resource indication field is simply referred to as the SRI field.

[0201] Embodiment 1: The size of the first (1st) TPMI field may be determined based on maxRank, and the second (2nd) TPMI may be determined based on the minimum value of maxRank 1 and maxRank 2 (ie, min(maxRank 1, maxRank 2)).

[0202] When the SRS resource set indicator field in the scheduling DCI indicates STRP transmission (or indicates single-panel transmission), the first TPMI field can always be used to receive precoder and rank information applicable to the corresponding panel. For example, when the SRS resource set indicator field indicates 00 (or 01) and the first UL TCI state (or second UL TCI state) is applied to PUSCH transmission, the UE can use the first TPMI field to receive precoder and rank information.

[0203] Here, since maxRank (i.e., the configuration for STRP transmission) is generally configured to be greater than or equal to maxRank 1 (the configuration for panel 1 for STxMP transmission) or maxRank 2 (the configuration for panel 2 for STxMP transmission) (i.e., since the maximum transmission rank of each panel during STxMP transmission can be limited to 2 or less, and the maximum transmission rank during existing STRP transmission can be configured to 4 or less), it is desirable to use only the first TPMI field when indicating STRP transmission. If the second TPMI field is used for STRP transmission, when maxRank > maxRank 2, the size of the second TPMI field may not be sufficient to indicate the PMI used for STRP transmission. Therefore, it is desirable to use only the first TPMI field for STRP transmission.

[0204] On the other hand, if SDM STxMP transmission is indicated via the SRS resource set indicator field in the scheduling DCI (for example, the SRS resource set indicator field indicates 10 (or 11)), the precoder and rank information of the panel corresponding to the minimum value of maxRank 1 and maxRank 2 can be received via the second TPMI field, and the precoder and rank information of the remaining panels can be received via the first TPMI field. For example, if maxRank 1 and maxRank 2 are set to 1 and 2, respectively, the size of the second TPMI field is determined based on the smaller value of maxRank 1, and the precoder and rank of the first panel corresponding to maxRank 1 can be indicated via the second TPMI field. In addition, the precoder and rank of the second panel corresponding to maxRank 2 can be indicated via the first TPMI field.

[0205] As described above, since maxRank (i.e., the configuration transmitted by STRP) is configured to be greater than or equal to maxRank 1 (the configuration of panel 1 transmitted by STxMP) and maxRank 2 (the configuration of panel 2 transmitted by STxMP), it can be understood that the size of the first TPMI field in Example 1 is configured to be greater than or equal to the maximum value of maxRank 1 and maxRank 2. In addition, it can be understood that the second TPMI is determined based on the value of maxRank 1 or maxRank 2 (e.g., the minimum value).

[0206] As described above, different panels may correspond to different SRS resource sets or SRS resources, and may be indicated / configured to the UE through different SRS resource sets or SRS resources.

[0207] According to embodiment 1, the second TPMI field is configured based on the minimum value of maxRank 1 and maxRank 2, thus having the advantages of minimizing the size of the second TPMI field and reducing DCI overhead.

[0208] Embodiment 2: Similar to Embodiment 1, the size of the first TPMI field may be determined based on maxRank. On the other hand, the size of the second TPMI field may be determined based on maxRank 1.

[0209] If the SRS resource set indicator field in the scheduling DCI indicates STRP transmission (or indicates single panel transmission), the operation is the same as that in embodiment 1.

[0210] When SDM STxMP transmission is indicated by the SRS resource set indicator field in the scheduling DCI, the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to maxRank 1 (corresponding to SRS resource set 0) can be indicated by the second TPMI, and the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to maxRank 2 (corresponding to SRS resource set 1) can be indicated by the first TPMI.

[0211] As described above, since maxRank (i.e., the configuration for STRP transmission) is configured to be greater than or equal to maxRank 1 (the configuration for STxMP transmission panel 1) and maxRank 2 (the configuration for STxMP transmission panel 2), Embodiment 1 can be interpreted as: the size of the first TPMI field is configured to be greater than or equal to the maximum value of maxRank 1 and maxRank 2. In addition, it can be interpreted as: the second TPMI is determined based on one value of maxRank 1 and maxRank 2 (for example, maxRank 1).

[0212] In order for Example 2 to achieve the same effect as Example 1, the base station needs to always configure the value of maxRank 1 to be less than or equal to maxRank 2, and the UE can expect the value of maxRank 1 to be configured to be less than or equal to maxRank 2.

[0213] Embodiment 3: Similar to Embodiment 1, the size of the first TPMI field may be determined based on maxRank. On the other hand, the size of the second TPMI field may be determined based on maxRank 2.

[0214] If the SRS resource set indicator field in the scheduling DCI indicates STRP transmission (or indicates single panel transmission), the operation is the same as that in embodiment 1.

[0215] When SDM STxMP transmission is indicated by the SRS resource set indicator field in the scheduling DCI, the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to maxRank 1 (corresponding to SRS resource set 0) can be indicated by the first TPMI, and the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to maxRank 2 (corresponding to SRS resource set 1) can be indicated by the second TPMI.

[0216] As described above, since maxRank (i.e., the configuration transmitted by STRP) is configured to be greater than or equal to maxRank 1 (the configuration of panel 1 transmitted by STxMP) and maxRank 2 (the configuration of panel 2 transmitted by STxMP), it can be interpreted that the size of the first TPMI field in Example 1 is configured to be greater than or equal to the maximum value of maxRank 1 and maxRank 2. In addition, it can be interpreted that the second TPMI is determined based on one value between maxRank 1 and maxRank 2 (e.g., maxRank 2).

[0217] In order for Example 3 to achieve the same effect as Example 1, the base station needs to always configure the value of maxRank 2 to be less than or equal to maxRank 1, and the UE can expect the value of maxRank 2 to be configured to be less than or equal to maxRank 2.

[0218] Example 4: Based on the legacy maximum rank and legacy codebook subset restriction (CBSR) corresponding to STRP transmission, the size of the TPMI field for STRP can be assumed to be TPMI_strp. Furthermore, considering the maximum rank 1 and maximum rank 2, as well as CBSR1 and CBSR2 corresponding to STxMP transmission, the size of the TPMI field for each panel can be assumed to be TPMI_1 and TPMI_2. Furthermore, the final TPMI field size can be determined based on max(TPMI_strp, TPMI_1 + TPMI_2).

[0219] For example, if TPMI_strp (6 bits) > TPMI_1 (3 bits) + TPMI_2 (2 bits), the final TPMI field size can be determined to be 6 bits. In this case, the entire 6-bit TPMI field can be used when transmitting STRP. Alternatively, for STxMP transmission, the 6-bit TPMI field can be divided into two parts. For example, the first 3 bits can correspond to the first panel, and the remaining 3 bits can correspond to the second panel.

[0220] Here, if there are remaining code points (e.g., some of the 6 bits are unused), the remaining bits can be retained or padded with zeros to increase the DCI decoding probability. For example, if TPMI_strp (5 bits) < TPMI_1 (3 bits) + TPMI_2 (3 bits), the size of the final TPMI field can be determined to be 6 bits. Here, for example, if indicated by STRP transmission, only 5 bits are used. In this case, for example, 5 bits can be used in order from the most significant bit (MSB), or the remaining bits except the MSB can be used. In this case, the unused remaining bits can be regarded as reserved bits, or can be padded with zeros. On the other hand, if indicated by STxMP transmission, the 6-bit TPMI field can be divided into 3 bits for each panel and used.

[0221] Embodiment 5: The size of the TPMI field can be changed not only by the maxRank value, but also by the codebook subset restriction (CBSR). For example, the UL codebook (subset) can be configured as a full coherence codebook, a partial coherence codebook, an incoherent codebook, etc. according to the CBSR. Here, the order of the number of precoders in the codebook is full coherence > partial coherence > incoherent codebook. In other words, the full coherence codebook includes the partial / incoherent codebooks, and the partial coherence codebook includes the incoherent codebook.

[0222] Therefore, if the CBSR of the UL codebook is configured differently for each panel, the size of the first TPMI field / second TPMI field can also be configured differently. For this purpose, this embodiment can be extended to other embodiments of the present disclosure (e.g., Embodiment 1 / 2 / 3 / 4 and other remaining embodiments).

[0223] That is, in Embodiment 1 / 2 / 3 / 4, CBSR1 and CBSR2 can be defined / indicated for the two panels instead of maxRank 1 and maxRank 2.

[0224] For example, in Embodiment 1, the size of the second TPMI field can be determined based on the smaller CBSR between the number of precoders of CBSR1 and the number of precoders of CBSR2. In addition, the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to the smaller CBSR can be indicated by the second TPMI field, and the rank (i.e., RI) and precoder (i.e., PMI) of the remaining panel can be indicated by the first TPMI field. In addition, the size of the first TPMI field can be determined to be equal to or greater than the maximum value between the number of precoders of CBSR1 and the number of precoders of CBSR2.

[0225] In Embodiment 2, the size of the second TPMI field may be determined based on the number of precoders for CBSR1. When SDM STxMP transmission is indicated using the SRS Resource Set Indicator field in the scheduling DCI, the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to CBSR1 (corresponding to SRS resource set 0) may be indicated using the second TPMI, and the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to CBSR2 (corresponding to SRS resource set 1) may be indicated using the first TPMI. Furthermore, the base station is required to always configure the number of precoders for CBSR1 to be less than or equal to the number of precoders for CBSR2, and the UE is expected to configure the number of precoders for CBSR1 to be less than or equal to the number of precoders for CBSR2.

[0226] Similarly, Example 3 can be expanded and applied from the perspective of CBSR rather than maxRank. In Example 3, the size of the second TPMI field can be determined based on the number of precoders in CBSR2. When SDM STxMP transmission is indicated via the SRS Resource Set Indicator field in the scheduling DCI, the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to CBSR2 (corresponding to SRS resource set 1) can be indicated via the second TPMI, while the rank (i.e., RI) and precoder (i.e., PMI) of the panel corresponding to CBSR1 (corresponding to SRS resource set 0) can be indicated via the first TPMI. Furthermore, the base station is required to always configure the number of precoders in CBSR2 to be less than or equal to the number of precoders in CBSR1, and the UE is expected to configure the number of precoders in CBSR2 to be less than or equal to the number of precoders in CBSR1.

[0227] Example 6: In the case of non-codebook (NCB, non-CB) PUSCH, the SRI field can be used instead of the TPMI field to indicate precoder and rank information. In this case, the size of the SRI field can be determined by the Lmax value. In other words, the size of the SRI field can be similar to the use of maxRank in CB PUSCH to determine the size of the TPMI field.

[0228] Therefore, in the above embodiment, the method of determining the size of the first and second TPMI fields by configuring the values of maxRank, maxRank 1, and maxRank 2 can be equally applied to the method of determining the size of the first and second SRI fields by configuring the values of Lmax, Lmax1, and Lmax2. That is, the Lmax value of the existing STRP transmission can be configured through RRC signaling, and the Lmax1 and Lmax2 values for each panel can be configured through RRC signaling during SDM STxMP transmission. In this case, embodiments 1, 2, 3, 4, and the remaining embodiments can be applied as follows.

[0229] In Example 1, the size of the first SRI field is determined by the Lmax value, and the size of the second SRI field can be configured based on the smaller value of Lmax1 and Lmax2. The method of Example 1 can also be applied to determine which of the first and second SRI fields to use in STRP transmission. In addition, the connection relationship between each panel and the SRI field in the SDM STxMP can be applied in the same manner by replacing the first TPMI field / second TPMI field in CB PUSCH Example 1 with the first SRI field / second SRI field.

[0230] For Example 2, the size of the first SRI field can be determined based on the Lmax value, and the size of the second SRI field can be configured based on the Lmax1 value. In this case, the base station needs to configure Lmax1 to be less than or equal to Lmax2, and the UE can be expected to configure Lmax1 to be less than or equal to Lmax2.

[0231] For Example 3, the size of the first SRI field can be determined based on the Lmax value, and the size of the second SRI field can be configured based on the Lmax2 value. In this case, the base station needs to configure Lmax2 to be less than or equal to Lmax1, and the UE can be expected to configure Lmax2 to be less than or equal to Lmax1.

[0232] In addition, in embodiments 1, 2, 3 and 4, which SRI field to use in STRP transmission and how to connect each panel and SRI field in SDM STxMP can be applied in the same manner by replacing the first TPMI field / second TPMI field in CB PUSCH embodiments 1, 2 and 3 with the first SRI field / second SRI field.

[0233] For Example 4, considering Lmax corresponding to STRP transmission, the size of the SRI field of STRP can be assumed to be SRI_strp. Additionally, considering Lmax1 and Lmax2 corresponding to STxMP transmission, the size of the SRI field for each panel can be assumed to be SRI_1 and SRI_2. And, the size of the final SRI field can be determined based on max(SRI_strp, SRI_1 + SRI_2).

[0234] For example, if SRI_strp (6 bits) > SRI_1 (3 bits) + SRI_2 (2 bits), the size of the final SRI field can be determined to be 6 bits. In this case, the entire 6-bit SRI field can be used when transmitting STRP. Additionally, in the case of STxMP, the 6-bit SRI field can be divided into two and used. For example, the first 3 bits can correspond to the first panel, and the remaining 3 bits can correspond to the second panel.

[0235] Here, if there are remaining code points (e.g., some bits in the 6 bits are not used), the remaining bits can be reserved or filled with zeros to increase the DCI decoding probability. For example, if SRI_strp (5 bits) < SRI_1 (3 bits) + SRI_2 (3 bits), the size of the final SRI field can be determined to be 6 bits. Here, for example, if it is indicated as STRP, only 5 bits can be used. In this case, for example, the 5 bits can be used in order starting from the MSB, or the remaining bits except the MSB can be used. In this case, the unused remaining bits can be regarded as reserved bits or can be filled with zeros. On the other hand, if it is indicated as STxMP transmission, the 6-bit SRI field can be divided into 3 bits for each panel and used.

[0236] Example 7: A codebook subset is reported to the base station as UE capability, and (referring to this) the base station can indicate which CBSR the UE should apply in uplink transmission. In this case, according to this embodiment, the UE can report the codebook subset to the base station separately by panel or separately by mode (STxMP or non-STxMP) through UE capability. That is, the UE can report the codebook subset separately by panel and / or by mode (STxMP or non-STxMP) through UE capability.

[0237] That is, if the UE has multiple Tx panels, the UE can increase the freedom of panel implementation by reporting to the base station which codebook subset each panel supports. In addition, the UE can report the existing codebook subset UE capability for non-STxMP transmission and separately report the newly defined codebook subset UE capability for STxMP transmission. For example, for non-STxMP, even if multiple panels are used for UL transmission, power or beam information is not configured differently for each panel, and partially coherent or non-coherent subsets are reported, so that different layers / layer groups are transmitted on different panels for one channel; and in STxMP, each panel can be reported to support a fully coherent subset.

[0238] Meanwhile, in the above embodiment, maxRank 1 and maxRank 2 may have the same value as a special case, or may have the same value as the legacy maxRank.

[0239] Similarly, in the above embodiment, CBSR1 and CBSR2 may have the same value as a special case, or may have the same value as the legacy CBSR.

[0240] Example 8: The existing maxRank value may be ignored, and only maxRank 1 and maxRank 2 may be used. That is, the size of the first TPMI field may be determined based on the maximum value of maxRank 1 and maxRank 2 (i.e., max(maxRank 1, maxRank 2)), and the size of the second TPMI field may be determined based on the minimum value of maxRank 1 and maxRank 2 (i.e., min(maxRank 1, maxRank 2)).

[0241] When STRP transmission is indicated via the SRS resource set indicator field in the scheduling DCI (or when single-panel transmission is indicated), the first TPMI field can always be used to receive the precoder and rank information applied to the corresponding panel. For example, when the SRS resource set indicator field indicates 00 (or 01) and the first UL TCI state (or second UL TCI state) is applied to PUSCH transmission, the UE can use the first TPMI field to receive the precoder and rank information.

[0242] Here, when STRP transmission is indicated, PUSCH can be transmitted using SRS resource set 0 or SRS resource set 1. Therefore, the size of the first TPMI field is configured based on the maximum value of the maxRank 1 and maxRank 2 values configured corresponding to each SRS resource set, and this field can be used to determine the TPMI for STRP transmission.

[0243] On the other hand, if SDM STxMP transmission is indicated via the SRS resource set indicator field in the scheduling DCI (for example, the SRS resource set indicator field indicates 10 (or 11)), the precoder and rank information of the panel corresponding to the minimum value of maxRank 1 and maxRank 2 can be received via the second TPMI field, and the precoder and rank information of the remaining panels can be received via the first TPMI field. For example, if maxRank 1 and maxRank 2 are configured as 1 and 2, respectively, the size of the second TPMI field is determined based on the smaller value of maxRank 1, and the precoder and rank of the first panel corresponding to maxRank 1 can be indicated via the second TPMI field. Furthermore, the precoder and rank of the second panel corresponding to maxRank 2 can be indicated via the first TPMI field.

[0244] Similarly, for non-CB PUSCH, the size of the first SRI field may be determined based on the maximum value of Lmax1 and Lmax2 (i.e., max(Lmax1, Lmax2)), and the size of the second SRI field may be determined based on the minimum value of Lmax1 and Lmax2 (i.e., min(Lmax1, Lmax2)). For other operations, the above operations may be applied identically by replacing maxRank 1 and maxRank2 with Lmax1 and Lmax2, respectively.

[0245] Example 9: maxRank 1 and 2 can be defined to be decoupled from UE capabilities.

[0246] When two SRI fields and / or SRS resource set indicator fields and / or two TPMI fields are configured in the DCI for STxMP transmission, the sizes of the SRI and / or TPMI fields can be determined using new parameters instead of the existing maxRank, Lmax, and CBSR. That is, for CB PUSCH, the sizes of the two TPMI fields can be determined using maxRank 1 and maxRank 2 (and additionally, CBSR1 and CBSR2, respectively). For example, the size of the first TPMI field can be determined based on maxRank 1 (configured by the base station by limiting it based on UE capabilities) and CBSR1, while the size of the second TPMI field can be determined based on maxRank 2 (configured by the base station by limiting it based on UE capabilities) and CBSR2. Furthermore, for non-CB PUSCH, the sizes of the two SRI fields can be determined based on Lmax1 and Lmax2, respectively. Here, if CBSR1 and CBSR2 are not defined / configured, the size of the TPMI field can be determined by (typically) using the existing CBSR instead of CBSR1 and CBSR2.

[0247] The UE can use its capabilities to report the maximum rank information (=maxRankForPUSCH) available for PUSCH transmission to the base station. In this case, for CB PUSCH, the UE can expect maxRank 1 to be configured to be less than or equal to the maximum rank value reported by the UE capabilities. Alternatively, for non-CB PUSCH, the UE can expect Lmax1 to be configured to be less than or equal to the maximum rank value reported by the UE capabilities. In this case, the same effect as determining the size of the first TPMI / SRI field in Embodiments 1, 2, and 3 can be achieved.

[0248] Alternatively, for CB PUSCH, the UE may expect maxRank 2 to be configured to be less than or equal to the maximum rank value reported in the UE capabilities.Alternatively, for non-CB PUSCH, the UE may expect Lmax2 to be configured to be less than or equal to the maximum rank value reported in the UE capabilities.

[0249] Alternatively, for CB PUSCH, the UE may expect maxRank 1 + maxRank 2 to be configured to be less than or equal to the maximum rank value reported in the UE capabilities. Alternatively, for non-CB PUSCH, the UE may expect Lmax1 + Lmax2 to be configured to be less than or equal to the maximum rank value reported in the UE capabilities.

[0250] In addition, the UE can use the UE capability to report to the base station the maximum rank information available for PUSCH transmission in a panel corresponding to an SRS resource set. For example, the UE can report the maximum rank information available for PUSCH transmission in panel 1 corresponding to SRS resource set 0 (=maxRankForPanel1) and the maximum rank information available for PUSCH transmission in panel 2 corresponding to SRS resource set 1 (=maxRankForPanel2).

[0251] Here, for CB PUSCH, the UE may expect maxRank 1 to be configured as less than or equal to maxRankForPanel1, and maxRank 2 to be configured as less than or equal to maxRankForPanel2. Alternatively, for non-CB PUSCH, the UE may expect Lmax1 to be configured as less than or equal to maxRankForPanel1, and Lmax2 to be configured as less than or equal to maxRankForPanel2.

[0252] Alternatively, for CB PUSCH, the UE may expect maxRank 2 to be configured as min(maxRankForPanel1, maxRankForPanel2) or less. In this case, the same effect as in Embodiment 1 can be obtained. Alternatively, for non-CB PUSCH, the UE may expect Lmax2 to be configured as min(maxRankForPanel1, maxRankForPanel2) or less.

[0253] Alternatively, for CB PUSCH, the UE may expect maxRank 2 to be configured to be less than or equal to maxRankForPanel1, and the UE may report that maxRankForPanel1 is always less than or equal to maxRankForPanel2. In this case, the same effect as in Embodiment 2 can be achieved. Alternatively, for non-CBPUSCH, the UE may expect Lmax2 to be configured to be less than or equal to maxRankForPanel1, and the UE may report that maxRankForPanel1 is always less than or equal to maxRankForPanel2.

[0254] Alternatively, for CB PUSCH, the UE may expect maxRank 2 to be configured as maxRankForPanel2 or less, and the UE may always report maxRankForPanel2 as a value less than or equal to maxRankForPanel1. In this case, the same effect as in Embodiment 3 can be obtained. Alternatively, for non-CB PUSCH, the UE may expect maxRank2 to be configured as maxRankForPanel2 or less, and the UE may always report maxRankForPanel2 as a value less than or equal to maxRankForPanel1.

[0255] Alternatively, for CB PUSCH, the UE may expect maxRank 1 to be configured as max(maxRankForPanel1, maxRankForPanel2) or less. In this case, the same effect as in Embodiment 8 can be obtained. Alternatively, for non-CB PUSCH, the UE may expect Lmax1 to be configured as less than or equal to max(maxRankForPanel1, maxRankForPanel2).

[0256] The above-mentioned embodiments may ultimately be applied through combination / aggregation, and thereby the size of the TPMI field and / or the SRI field in the DCI may be determined.

[0257] The parameters described in the above embodiments, whether the embodiments are applied, etc. can be indicated / configured by the base station to the UE, or can be reported by the UE to the base station or configured as fixed values.

[0258] Figure 7 A signaling process between a network and a UE for a PUSCH transmission and reception method according to an embodiment of the present disclosure is shown.

[0259] Figure 7 The present disclosure illustrates signaling between a network (e.g., TRP 1, TRP 2) and a UE in a scenario where multiple TRPs (i.e., M-TRPs or multi-cells, where all TRPs may be replaced by "cells" hereinafter) can be applied to the methods proposed in this disclosure (e.g., Embodiments 1 to 9, or a combination of one or more of the methods proposed in Embodiments 1 to 9). Here, the UE / network is merely an example and may be replaced by various devices. Figure 7 It is only used for convenience of explanation and does not limit the scope of the present disclosure. In addition, depending on the situation and / or setting, it can be omitted Figure 7 Some of the steps shown in .

[0260] Figure 7The signaling scheme described in the specification can be extended and applied to signaling between multiple TRPs and multiple UEs. In the following description, the network can be a base station including multiple TRPs, and can also be a cell including multiple TRPs. For example, an ideal / non-ideal backhaul can be established between TRP 1 and TRP 2 that constitute the network. In addition, although the following description is based on multiple TRPs, it can also be extended and applied to transmission through multiple panels. In addition, in the present disclosure, the operation of UE receiving a signal from TRP 1 / TRP 2 can also be interpreted / described as (or can be) the operation of UE receiving a signal from the network (via / using TRP 1 / 2), and the operation of UE sending a signal to TRP 1 / TRP 2 can also be interpreted / described as (or can be) the operation of UE sending a signal to the network (via / using TRP 1 / TRP 2), and vice versa.

[0261] A base station is a general term for an object used to transmit and receive data with a UE. For example, a base station can be conceptually composed of one or more transmission points (TPs), one or more transmission and reception points (TRPs), and so on. Furthermore, a TP and / or TRP can include a base station panel, transmission and reception unit, and so on. Furthermore, the term "TRP" can be used interchangeably with terms such as panel, antenna array, cell (e.g., macrocell, small cell, picocell, etc.), transmission point, or base station (gNB, etc.). As described above, a TRP can be distinguished based on information about a core set group (or core set pool) (e.g., index, ID). For example, if a UE is configured to transmit and receive using multiple TRPs (or cells), this may mean that multiple core set groups (or core set pools) are configured for the UE. Configuration of such core set groups (or core set pools) can be performed via higher-layer signaling (e.g., RRC signaling, etc.).

[0262] At the same time, despite Figure 7 Not shown, for example, according to the above-mentioned embodiment 7, the UE may report UE capability information to the network via / using TRP 1 (and / or TRP 2). Here, for a UE supporting multi-panel (i.e., STxMP) PUSCH transmission, the UE capability information may include at least one of the following two items: i) information for each supported codebook subset in the first panel and the second panel; and ii) information for each supported codebook subset in multi-panel transmission (i.e., STxMP) and non-multi-panel transmission (i.e., STRP transmission).

[0263] The UE may receive configuration information from the network via / using TRP 1 (and / or TRP 2) (S701).

[0264] The configuration information may include information related to network configuration (e.g., TRP configuration) / information related to M-TRP-based transmission and reception (e.g., resource allocation, etc.). The configuration information may be sent via higher-layer signaling (e.g., RRC signaling, MAC-CE, etc.).

[0265] In addition, for example, the configuration information may include information for configuring joint TCI and / or separate DL / UL TCI. For example, the configuration information may include a list of TCI states, which provides a reference for determining an uplink transmission spatial filter for a DMRS / uplink signal (e.g., SRS) of an uplink channel (e.g., PUSCH, PUCCH).

[0266] In addition, for example, the configuration information may include information about a multi-panel (ie, STxMP) PUSCH transmission scheme. For example, it may include information (eg, a higher layer parameter multipanelscheme) for configuring whether to transmit multi-panel (ie, STxMP), and through this information, whether to transmit STxMP and the STxMP transmission scheme (eg, SDM scheme or SFN scheme) may be configured.

[0267] Additionally, for example, the configuration information may include information for configuring the maximum number of layers for each panel in a multi-panel (i.e., STxMP) PUSCH transmission. That is, when a UE supports two panels and multi-panel PUSCH transmission is configured via both panels, the configuration information may include first information / parameters for configuring the maximum number of layers for the first panel (e.g., a higher-layer parameter maxRank 1, a higher-layer parameter for configuring the value of Lmax1, etc.), and second information / parameters for configuring the maximum number of layers for the second panel (e.g., a higher-layer parameter maxRank 2, a higher-layer parameter for configuring the value of Lmax2, etc.). Furthermore, the configuration information may also include third information / parameters for configuring the maximum number of layers for STRP PUSCH transmission (e.g., a higher-layer parameter maxRank, a higher-layer parameter for setting the value of Lmax, etc.). Furthermore, the configuration information may also include codebook subset information for the first panel (e.g., a higher-layer parameter codebookSubset1), and codebook subset information for the second panel (e.g., a higher-layer parameter codebookSubset2).

[0268] In addition, for example, the configuration information may include information about an SRS resource set, and at least two SRS resource sets may be configured for multi-panel PUSCH transmission. Here, since the usage of the SRS resource set is configured as "codebook" or "non-codebook", it can be indicated whether the PUSCH transmission scheduled by the DCI referencing the corresponding SRS resource set corresponds to codebook-based uplink transmission or non-codebook-based uplink transmission.

[0269] In addition, the above configuration information may include configuration information related to STRP PUSCH transmission or multi-panel (ie, STxMP) PUSCH transmission described in the above proposed method (eg, a combination of one or more of the methods proposed in Embodiments 1 to 9).

[0270] The UE receives downlink control information (DCI) from the network via / using TRP 1 (and / or TRP 2) (S702).

[0271] The DCI may be transmitted via a downlink control channel (eg, PDCCH) and may schedule a STRP PUSCH transmission or a multi-panel (STxMP) PUSCH transmission (ie, including a UL grant).

[0272] In addition, the DCI may include a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field.

[0273] Here, based on the value of the SRS resource set indicator field, it can be indicated whether the PUSCH transmission scheduled by the DCI is STRP PUSCH transmission (for example, the value of the SRS resource set indicator field is 00 or 01) or multi-panel (STxMP) PUSCH transmission (for example, the value of the SRS resource set indicator field is 10 or 11).

[0274] In addition, when PUSCH transmission is codebook-based transmission, the first precoding-related field and the second precoding-related field may correspond to the first precoding information and layer number field and the second precoding information and layer number field, respectively.

[0275] In addition, when the PUSCH transmission is non-codebook based transmission, the first precoding related field and the second precoding related field may correspond to a first sounding reference signal (SRS) resource indication field and a second SRS resource indication field, respectively.

[0276] The first precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the first panel, and the second precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the second panel.

[0277] The size of the first precoding related field may be determined to be equal to or greater than a maximum value between a value of first information for configuring a maximum number of layers for the first panel and a value of second information for configuring a maximum number of layers for the second panel.

[0278] For example, according to embodiments 1 to 3 and 6, the size of the first precoding-related field can be determined based on the value of the third information used to configure the maximum number of layers for STRP PUSCH transmission. In this case, since the value of the third information used to configure the maximum number of layers for STRP PUSCH transmission is greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be configured to be greater than the maximum value of the value of the first information or the value of the second information. In other words, based on the value of the third information being greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be determined based on the value of the third information.

[0279] In addition, for example, according to Embodiment 8, the size of the first precoding-related field may be determined based on a maximum value of the value of the first information or the value of the second information.

[0280] The size of the second precoding-related field may be determined based on the value of the first information or the value of the second information. For example, according to Embodiment 1, the size of the second precoding-related field may be determined based on the minimum value of the first information or the second information. Alternatively, for example, according to Embodiment 2, the size of the second precoding-related field may always be determined based on the value of the first information. Alternatively, for example, according to Embodiment 3, the size of the second precoding-related field may always be determined based on the value of the second information.

[0281] In addition, according to embodiment 5, the sizes of the first precoding-related field and the second precoding-related field can also be determined based on the codebook subset information for the first panel and the codebook subset information for the second panel, respectively (i.e., together with the determination based on the value of the first information, the value of the second information and / or the value of the third information).

[0282] At the same time, according to the above-mentioned embodiment 4, a single precoding-related field is defined, and the precoder and / or rank for STRP PUSCH transmission can be indicated / determined in this single precoding-related field, and the precoder and / or rank for multi-panel PUSCH transmission can also be indicated / determined. In this case, the size of the single precoding-related field can be determined according to embodiment 4 to support two transmission methods.

[0283] The UE transmits a PUSCH to the network via / using TRP 1 (and / or TRP 2) (S703).

[0284] Here, in the case of STRP PUSCH transmission, the UE may perform STRP PUSCH transmission to the network via / using a single TRP according to scheduling of DCI based on a single spatial relation RS (or UL TCI state).

[0285] Alternatively, in the case of multi-panel (STxMP) PUSCH transmission, the UE can perform multi-panel (STxMP) PUSCH transmission (SDM mode or SFN mode) to the network via / using multiple TRPs of multiple panels according to the scheduling of DCI based on different spatial relationship RSs (or different UL TCI states).

[0286] Figure 8 The operation of the UE for the PUSCH transmission and reception method according to an embodiment of the present disclosure is illustrated.

[0287] refer to Figure 8 , Figure 8 The operation of the UE based on the proposed method (eg, a combination of one or more of the methods proposed in Embodiments 1 to 9) is shown. Figure 8 The examples are for convenience of explanation and do not limit the scope of the present disclosure. Figure 8 In addition, Figure 8 The UE in FIG. 1 is only an example and may be implemented as the device shown in FIG. 20 below. For example, Figure 10 The processor (102 / 202) in the can control the transceiver (106 / 206) to send and receive channels / signals / data / information, etc., and can also control Figure 10 The processor (102 / 202) stores the transmitted or received channel / signal / data / information etc. in the memory (104 / 204).

[0288] in addition, Figure 8 The operation can be performed by Figure 10 One or more processors (102, 202) process, and Figure 8 The operations can be stored in a memory (e.g., Figure 10 One or more memories (104, 204)) for driving Figure 10 At least one processor (eg, 102, 202).

[0289] At the same time, although Figure 8Not shown, for example, according to the above-mentioned embodiment 7, the UE may report UE capability information to the base station. Here, for a UE supporting multi-panel (i.e., STxMP) PUSCH transmission, the UE capability information may include at least one of the following: i) codebook subset information supported for each of the first panel and the second panel, and ii) codebook subset information supported for each of multi-panel transmission (i.e., STxMP) and non-multi-panel transmission (i.e., STRP transmission).

[0290] The UE receives configuration information related to PUSCH transmission from a base station (via / using TRP 1 and TRP 2) (S801).

[0291] The configuration information may include configuration information related to uplink PUSCH transmission to multiple TRPs (e.g., STxMP transmission) described in the above-mentioned proposed method (e.g., a combination of one or more of the methods proposed in Examples 1 to 9).

[0292] For example, the configuration information may include information about a multi-panel (ie, STxMP) PUSCH transmission scheme. For example, it may include information for configuring whether to transmit multi-panel (ie, STxMP) (eg, a higher layer parameter multipanelscheme), and through this information, whether to transmit STxMP and the STxMP transmission scheme (eg, SDM scheme or SFN scheme) may be configured.

[0293] Additionally, for example, the configuration information may include information for configuring the maximum number of layers for each panel in multi-panel (i.e., STxMP) PUSCH transmissions. That is, when a UE supports two panels and multi-panel PUSCH transmissions are configured via both panels, the configuration information may include first information / parameters for configuring the maximum number of layers for the first panel (e.g., a higher-layer parameter maxRank 1, a higher-layer parameter for configuring the value of Lmax1, etc.) and for configuring the maximum number of layers for the second panel (e.g., a higher-layer parameter maxRank 2, a higher-layer parameter for configuring the value of Lmax2, etc.). Furthermore, the configuration information may also include third information / parameters for configuring the maximum number of layers for STRP PUSCH transmissions (e.g., a higher-layer parameter maxRank, a higher-layer parameter for setting the value of Lmax, etc.). Furthermore, the configuration information may also include codebook subset information for the first panel (e.g., a higher-layer parameter codebookSubset1), and codebook subset information for the second panel (e.g., a higher-layer parameter codebookSubset2).

[0294] The UE receives downlink control information (DCI) from the base station (via / using TRP 1 and TRP 2) (S802).

[0295] The DCI may be sent via a downlink control channel (eg, PDCCH) and may schedule STRP PUSCH transmissions or multi-panel (STxMP) PUSCH transmissions (ie, including UL grants).

[0296] In addition, the DCI may include a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field.

[0297] Here, based on the value of the SRS resource set indicator field, it can be indicated whether the PUSCH transmission scheduled by the DCI is STRP PUSCH transmission (for example, the value of the SRS resource set indicator field is 00 or 01) or multi-panel (STxMP) PUSCH transmission (for example, the value of the SRS resource set indicator field is 10 or 11).

[0298] In addition, when PUSCH transmission is codebook-based transmission, the first precoding-related field and the second precoding-related field may correspond to the first precoding information and layer number field and the second precoding information and layer number field, respectively.

[0299] In addition, when the PUSCH transmission is non-codebook based transmission, the first precoding related field and the second precoding related field may correspond to a first sounding reference signal (SRS) resource indication field and a second SRS resource indication field, respectively.

[0300] The first precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the first panel, and the second precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the second panel.

[0301] The size of the first precoding related field may be determined to be equal to or greater than a maximum value between a value of first information for configuring a maximum number of layers for the first panel and a value of second information for configuring a maximum number of layers for the second panel.

[0302] For example, according to embodiments 1 to 3 and 6, the size of the first precoding-related field can be determined based on the value of the third information for configuring the maximum number of layers for STRP PUSCH transmission. In this case, since the value of the third information for configuring the maximum number of layers for STRPP USCH transmission is greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be configured to be greater than the maximum value of the value of the first information or the value of the second information. In other words, based on the value of the third information being greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be determined based on the value of the third information.

[0303] In addition, for example, according to Embodiment 8, the size of the first precoding-related field may be determined based on a maximum value of the value of the first information or the value of the second information.

[0304] The size of the second precoding-related field may be determined based on the value of the first information or the value of the second information. For example, according to Embodiment 1, the size of the second precoding-related field may be determined based on the minimum value of the first information or the second information. Alternatively, for example, according to Embodiment 2, the size of the second precoding-related field may always be determined based on the value of the first information. Alternatively, for example, according to Embodiment 3, the size of the second precoding-related field may always be determined based on the value of the second information.

[0305] In addition, according to embodiment 5, the sizes of the first precoding-related field and the second precoding-related field can also be determined based on the codebook subset information for the first panel and the codebook subset information for the second panel, respectively (i.e., together with the determination based on the value of the first information, the value of the second information and / or the value of the third information).

[0306] The UE transmits a multi-panel PUSCH to the base station via / using TRP 1 (and / or TRP 2) (S803).

[0307] That is, based on the value of the SRS resource set indicator field of the DCI, the UE can send a multi-panel PUSCH transmission to the base station.

[0308] In the case of multi-panel (STxMP) PUSCH transmission, the UE can perform multi-panel (STxMP) PUSCH transmission (SDM mode or SFN mode) to the network via / using multiple TRPs of multiple panels according to DCI scheduling based on different spatial relationship RSs (or different UL TCI states).

[0309] Figure 9 The operation of a base station for a PUSCH transmission and reception method according to an embodiment of the present disclosure is illustrated.

[0310] refer to Figure 9 , Figure 9 The operation of the base station based on the proposed method (eg, a combination of one or more methods proposed in Embodiments 1 to 9) is shown. Figure 9 The examples are for convenience of explanation and do not limit the scope of the present disclosure. Figure 9 In addition, Figure 9 The base station in the example is only an example and can be implemented as follows Figure 10 For example, Figure 10The processor (102 / 202) in the embodiment can control the transceiver (106 / 206) to send and receive channels / signals / data / information, etc., and can also control Figure 10 The processor (102 / 202) in the system stores the transmitted or received channel / signal / data / information etc. in the memory (104 / 204).

[0311] in addition, Figure 9 The operation can be performed by Figure 10 One or more processors (102, 202) process, and Figure 9 The operations can be stored in a memory (eg, Figure 10 One or more memories (104, 204)) for driving Figure 10 At least one processor (eg, 102, 202).

[0312] At the same time, although Figure 9 Although not shown, for example, according to the above-mentioned embodiment 7, the base station may receive UE capability information from the UE. Here, for a UE supporting multi-panel (i.e., STxMP) PUSCH transmission, the UE capability information may include at least one of the following: i) information for each supported codebook subset in the first panel and the second panel; and ii) information for each supported codebook subset in multi-panel transmission (i.e., STxMP) and non-multi-panel transmission (i.e., STRP transmission).

[0313] The base station transmits configuration information related to PUSCH transmission to the UE (via / using TRP 1 (and / or TRP 2)) (S901).

[0314] The configuration information may include configuration information related to uplink PUSCH transmission (e.g., STxMP transmission) of multiple TRPs described in the above-mentioned methods (e.g., a combination of one or more of the methods proposed in Examples 1 to 9).

[0315] For example, the configuration information may include information about a multi-panel (ie, STxMP) PUSCH transmission scheme. For example, it may include information for configuring whether to transmit multi-panel (ie, STxMP) (eg, a higher layer parameter multipanelscheme), and through this information, whether to transmit STxMP and the STxMP transmission scheme (eg, SDM scheme or SFN scheme) may be configured.

[0316] Additionally, for example, the configuration information may include information for configuring the maximum number of layers for each panel in a multi-panel (i.e., STxMP) PUSCH transmission. That is, when a UE supports two panels and multi-panel PUSCH transmission is configured via both panels, the configuration information may include first information / parameters for configuring the maximum number of layers for the first panel (e.g., a higher-layer parameter maxRank 1, a higher-layer parameter for configuring the value of Lmax1, etc.) and second information / parameters for configuring the maximum number of layers for the second panel (e.g., a higher-layer parameter maxRank 2, a higher-layer parameter for configuring the value of Lmax2, etc.). Furthermore, the configuration information may also include third information / parameters for configuring the maximum number of layers for STRP PUSCH transmission (e.g., a higher-layer parameter maxRank, a higher-layer parameter for setting the value of Lmax, etc.). Furthermore, the configuration information may also include codebook subset information for the first panel (e.g., a higher-layer parameter codebookSubset1) and codebook subset information for the second panel (e.g., a higher-layer parameter codebookSubset2).

[0317] The base station transmits downlink control information (DCI) to the UE (via / using TRP 1 and TRP 2) (S902).

[0318] The DCI may be transmitted via a downlink control channel (eg, PDCCH) and may schedule a STRP PUSCH transmission or a multi-panel (STxMP) PUSCH transmission (ie, including a UL grant).

[0319] In addition, the DCI may include a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field.

[0320] Here, based on the value of the SRS resource set indicator field, it can be indicated that the PUSCH transmission scheduled by the DCI is STRPPUSCH transmission (for example, the value of the SRS resource set indicator field is 00 or 01) or multi-panel (STxMP) PUSCH transmission (for example, the value of the SRS resource set indicator field is 10 or 11).

[0321] In addition, when PUSCH transmission is codebook-based transmission, the first precoding-related field and the second precoding-related field may correspond to the first precoding information and layer number field and the second precoding information and layer number field, respectively.

[0322] In addition, when the PUSCH transmission is non-codebook based transmission, the first precoding related field and the second precoding related field may correspond to a first sounding reference signal (SRS) resource indication field and a second SRS resource indication field, respectively.

[0323] The first precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the first panel, and the second precoding-related field may indicate / determine the precoder and / or rank applied across one or more layers for the second panel.

[0324] The size of the first precoding related field may be determined to be equal to or greater than a maximum value between a value of first information for configuring a maximum number of layers for the first panel and a value of second information for configuring a maximum number of layers for the second panel.

[0325] For example, according to embodiments 1 to 3 and 6, the size of the first precoding-related field can be determined based on the value of the third information for configuring the maximum number of layers for STRP PUSCH transmission. In this case, since the value of the third information for configuring the maximum number of layers for STRPP USCH transmission is greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be configured to be greater than the maximum value of the value of the first information or the value of the second information. In other words, based on the value of the third information being greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field can be determined based on the value of the third information.

[0326] In addition, for example, according to Embodiment 8, the size of the first precoding-related field may be determined based on a maximum value of the value of the first information or the value of the second information.

[0327] The size of the second precoding-related field may be determined based on the value of the first information or the value of the second information. For example, according to Embodiment 1, the size of the second precoding-related field may be determined based on the minimum value of the first information or the second information. Alternatively, for example, according to Embodiment 2, the size of the second precoding-related field may always be determined based on the value of the first information. Alternatively, for example, according to Embodiment 3, the size of the second precoding-related field may always be determined based on the value of the second information.

[0328] In addition, according to embodiment 5, the sizes of the first precoding-related field and the second precoding-related field can also be determined based on the codebook subset information for the first panel and the codebook subset information for the second panel, respectively (i.e., together with the determination based on the value of the first information, the value of the second information and / or the value of the third information).

[0329] The base station receives a multi-panel PUSCH from the UE via / using TRP 1 (and / or TRP 2) (S903).

[0330] That is, based on the value of the SRS resource set indicator field of the DCI, the base station can receive multi-panel PUSCH transmission from the UE.

[0331] In the case of multi-panel (STxMP) PUSCH transmission, the UE can perform multi-panel (STxMP) PUSCH transmission (SDM mode or SFN mode) to the network via / using multiple TRPs of multiple panels according to DCI scheduling based on different spatial relationship RSs (or different UL TCI states).

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

[0333] Figure 10 is a diagram illustrating a block diagram of a wireless communication device according to an embodiment of the present disclosure.

[0334] refer to Figure 10 , the first wireless device 100 and the second wireless device 200 can send and receive wireless signals through various radio access technologies (e.g., LTE, NR).

[0335] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. For example, the processor 102 may generate first information / signals by processing information in the memory 104 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 / signals through the transceiver 106 and then store information obtained by signal processing of the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including commands for executing all or part of the processes controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. Here, the processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). A 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 in conjunction with an RF (Radio Frequency) unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0336] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. For example, the processor 202 may generate third information / signals by processing the information in the memory 204, and then transmit a wireless signal including the third information / signals through the transceiver 206. In addition, the processor 202 may receive a wireless signal including fourth information / signals through the transceiver 206, and then store information obtained by 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 store software code including commands for executing all or part of the processes controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure. Here, the processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 206 may be connected to the processor 202 and 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 in conjunction with an RF unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0337] The hardware elements of the wireless devices 100 and 200 will be described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (Service Data Units) in accordance with the descriptions, functions, procedures, proposals, methods, and / or operational flow charts included in this disclosure. The one or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, proposals, methods, and / or operational flow charts disclosed in this disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information in accordance with the functions, procedures, proposals, and / or methods disclosed in this disclosure to provide them to one or more transceivers 106 and 206. The one or more processors 102 , 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 , 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this disclosure.

[0338] The one or more processors 102, 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. In some examples, one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices), or one or more FPGAs (Field Programmable Gate Arrays) may be included in the one or more processors 102, 202. The descriptions, functions, processes, 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 firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure may be included in the one or more processors 102, 202 or may be stored in one or more memories 104, 204 and driven by the one or more processors 102, 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this disclosure may be implemented in firmware or software in the form of code, commands, and / or command sets.

[0339] The one or more memories 104, 204 may be connected to the one or more processors 102, 202 and may be capable of storing data, signals, messages, information, programs, codes, instructions, and / or commands in various forms. The one or more memories 104, 204 may be configured with ROM, RAM, EPROM, flash memory, a hard drive, registers, cache memory, a computer-readable storage medium, and / or a combination thereof. The one or more memories 104, 204 may be located internally and / or externally to the one or more processors 102, 202. Furthermore, the one or more memories 104, 204 may be connected to the one or more processors 102, 202 via a variety of technologies, such as wired or wireless connections.

[0340] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, and the like mentioned in the methods and / or operational flowcharts, etc., disclosed herein to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, and the like mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and may be configured to transmit and receive user data, control information, wireless signals / channels, and the like as described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts of this disclosure via the one or more antennas 108, 208. In the present disclosure, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 may process the received user data, control information, wireless signals / channels, and the like by converting them from RF band signals to baseband signals using the one or more processors 102, 202. The one or more transceivers 106, 206 may convert the user data, control information, wireless signals / channels, and the like processed by the one or more processors 102, 202 from baseband signals to RF band signals. Therefore, the one or more transceivers 106, 206 may include (analog) oscillators and / or filters.

[0341] The above-mentioned embodiments are elements and features of the present disclosure combined in a predetermined form. Unless otherwise explicitly mentioned, each element or feature should be considered optional. Each element or feature can be implemented in a form not combined with other elements or features. In addition, the embodiments of the present disclosure may include combined elements and / or features. The order of the operations described in the embodiments of the present disclosure may be changed. Some elements or features of an embodiment may be included in other embodiments, or may be replaced with corresponding elements or features of other embodiments. It is clear that an embodiment may include a combined claim without an explicit dependency relationship in the claim, or may be included as a new claim by modification after application.

[0342] It is clear to those skilled in the art that the present disclosure can be implemented in other specific forms without exceeding the essential features of the present disclosure. Therefore, the above detailed description should not be interpreted restrictively in every aspect, but should be considered as illustrative. The scope of the present invention should be determined by the reasonable interpretation of the appended claims, and all changes within the equivalent range of the present disclosure are included within the scope of the present invention.

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

[0344] The wireless communication technologies implemented in the wireless devices 100 and 200 of the present disclosure may include narrowband IoT (NB-IoT) for low-power communication, as well as LTE, NR, and 6G. For example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented in standards such as LTE Cat. NB1 and / or LTE Cat. NB2, and is not limited to the aforementioned designations. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100 and 200 of the present disclosure may perform communications based on LTE-M technology. In this example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least any one of the following standards, including 1) LTE Cat. 0, 2) LTE Cat. M1, 3) LTE Cat. M2, 4) LTE Non-BL (Non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the aforementioned designations. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may include at least one of ZigBee, Bluetooth, and a low-power wide area network (LPWAN) considering low-power communication, and is not limited to the above-mentioned names. In an example, the ZigBee technology can generate a PAN (Personal Area Network) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be referred to by various names.

[0345] Industrial availability

[0346] The method proposed in the present invention is mainly described by taking the application in 3GPP LTE / LTE-A and 5G systems as an example, but can also be applied to various wireless communication systems other than 3GPP LTE / LTE-A and 5G systems.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving configuration information related to PUSCH (Physical Uplink Shared Channel) transmission from a base station, wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; receiving downlink control information (DCI) from the base station, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and sending the multi-panel PUSCH transmission to the base station based on the value of the SRS resource set indicator field of the DCI, The size of the first precoding related field is determined to be greater than or equal to the maximum value of the first information and the second information, and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

2. The method according to claim 1, wherein The configuration information includes third information for configuring a maximum number of layers for non-multi-panel PUSCH transmission; and Wherein, based on the value of the third information being greater than or equal to the value of the first information or the value of the second information, the size of the first precoding-related field is determined based on the value of the third information.

3. The method according to claim 1, wherein The size of the second precoding-related field is determined based on a minimum value among a value of the first information or a value of the second information.

4. The method according to claim 1, wherein The size of the second precoding-related field is always determined based on the value of the first information.

5. The method according to claim 1, wherein The size of the second precoding-related field is always determined based on the value of the second information.

6. The method according to claim 1, wherein Based on the fact that the multi-panel PUSCH transmission is codebook-based transmission, the first precoding-related field and the second precoding-related field correspond to a first precoding information and layer number field and a second precoding information and layer number field, respectively.

7. The method according to claim 1, wherein Based on the multi-panel PUSCH transmission being a non-codebook based transmission, the first precoding related field and the second precoding related field correspond to a first sounding reference signal (SRS) resource indication field and a second SRS resource indication field, respectively.

8. The method according to claim 1, wherein The configuration information also includes codebook subset information for the first panel and codebook subset information for the second panel, and The size of the first precoding related field and the size of the second precoding related field are determined based on the codebook subset information for the first panel and the codebook subset information for the second panel, respectively.

9. The method according to claim 1, further comprising: Sending UE capability information to the base station, The UE capability information includes at least one of the following: i) information about each supported codebook subset for the first panel and the second panel; and ii) information about each supported codebook subset for multi-panel transmission and non-multi-panel transmission.

10. A user equipment (UE) operating in a wireless communication system, the UE comprising: at least one transceiver, the at least one processor being configured to transmit and receive wireless signals; as well as at least one processor configured to control the at least one transceiver, Wherein, the at least one processor is configured to: receiving configuration information related to PUSCH (Physical Uplink Shared Channel) transmission from a base station, wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; receiving downlink control information (DCI) from the base station, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and sending the multi-panel PUSCH transmission to the base station based on the value of the SRS resource set indicator field of the DCI, The size of the first precoding related field is determined to be greater than or equal to the maximum value of the first information and the second information, and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

11. At least one non-transitory computer-readable medium storing at least one instruction, wherein the at least one instruction executable by at least one processor controls a user equipment (UE) to: Receive configuration information related to PUSCH (Physical Uplink Shared Channel) transmission from the base station, where The configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; receiving downlink control information (DCI) from a base station, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and sending the multi-panel PUSCH transmission to the base station based on the value of the SRS resource set indicator field of the DCI, The size of the first precoding related field is determined to be greater than or equal to the maximum value of the first information and the second information, and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

12. A processing device configured to control a user equipment (UE) in a wireless communication system, the processing device comprising: at least one processor; as well as At least one computer memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, perform operations comprising: receiving configuration information related to PUSCH (Physical Uplink Shared Channel) transmission from a base station, wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; receiving downlink control information (DCI) from the base station, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and sending the multi-panel PUSCH transmission to the base station based on a value of the SRS resource set indicator field of the DCI; The size of the first precoding related field is determined to be greater than or equal to the maximum value of the value of the first information and the value of the second information; and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

13. A method performed by a base station in a wireless communication system, the method performed by the base station comprising: Sending configuration information related to PUSCH (Physical Uplink Shared Channel) transmission to a user equipment (UE), wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; sending downlink control information (DCI) to the UE, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and receiving the multi-panel PUSCH transmission from the UE based on a value of the SRS resource set indicator field of the DCI, The size of the first precoding related field is determined to be greater than or equal to the maximum value of the first information and the second information, and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

14. A base station operating in a wireless communication system, the base station comprising: at least one transceiver for transmitting and receiving wireless signals; as well as at least one processor configured to control the at least one transceiver, Wherein, the at least one processor is configured to: sending configuration information related to PUSCH (Physical Uplink Shared Channel) transmission to a user equipment (UE), wherein the configuration information includes first information for configuring a maximum number of layers for a first panel and second information for configuring a maximum number of layers for a second panel for multi-panel PUSCH transmission; sending downlink control information (DCI) to the UE, wherein the DCI includes a sounding reference signal (SRS) resource set indicator field, a first precoding related field, and a second precoding related field; and receiving the multi-panel PUSCH transmission from the UE based on a value of the SRS resource set indicator field of the DCI, The size of the first precoding related field is determined to be greater than or equal to the maximum value of the first information and the second information, and The size of the second precoding related field is determined based on the value of the first information or the value of the second information.

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