Method and device for multi-cell scheduling in communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to operations of a UE and a base station in a wireless communication system. A method performed by a UE in a communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving information related to a scheduled cell set through higher layer signaling; receiving, through a scheduling cell, downlink control information (DCI) for scheduling data communication in one or more scheduled cells among the plurality of cells included in the scheduled cell set; identifying, on the basis of the DCI, whether each of the one or more scheduled cells is operated with a single transmission and reception point (TRP) or multi-TRPs; and performing the data communication through the one or more scheduled cells on the basis of the identification.

Description

Method and device for multi-cell scheduling in a communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a multi-cell scheduling method and device in a communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] The disclosed embodiment seeks to provide a device and method capable of effectively providing a service in a mobile communication system.

[0009] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0010] A method performed by a terminal in a communication system according to one embodiment of the present disclosure includes the steps of: receiving information related to a set of scheduled cells through upper layer signaling; receiving DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the set of scheduled cells through a scheduling cell; identifying, based on the DCI, whether each of the one or more scheduled cells is operated as a single transmission and reception point (TRP) or multiple TRPs; and performing the data communication through the one or more scheduled cells based on the identification.

[0011] According to one embodiment of the present disclosure, the DCI includes a scheduled cell set indicator field.

[0012] According to one embodiment of the present disclosure, when the scheduled cell set indicator field is 1 bit, a first code point of the scheduled cell set indicator field indicates that a scheduled cell associated with the scheduled cell set indicator field is operated as a single TRP, and a second code point of the scheduled cell set indicator field indicates that a scheduled cell associated with the scheduled cell set indicator field is operated as a multiple TRP.

[0013] According to one embodiment of the present disclosure, when the scheduled cell set indicator field is 2 bits, the least significant bit (LSB) of the scheduled cell set indicator field indicates a scheduled cell associated with the scheduled cell set indicator field, and the most significant bit (MSB) of the scheduled cell set indicator field indicates whether the scheduled cell indicated by the LSB is operated as a single TRP or as multiple TRPs.

[0014] According to one embodiment of the present disclosure, the DCI includes one or more transmission configuration indication (TCI) state fields corresponding to the one or more scheduled cells, and the one or more TCI state fields are sorted in ascending order of indices of the one or more scheduled cells.

[0015] According to one embodiment of the present disclosure, when a code point of a TCI status field indicates multiple TCI states, a scheduled cell corresponding to the TCI status field is operated as a multiple TRP.

[0016] According to one embodiment of the present disclosure, when a code point of a TCI status field indicates one TCI status, a scheduled cell corresponding to the TCI status field is operated as a single TRP.

[0017] According to one embodiment of the present disclosure, the DCI includes a field related to a CORESET (control resource set) pool index, and one or more bits included in the field related to the CORESET pool index correspond to the one or more scheduled cells.

[0018] According to one embodiment of the present disclosure, whether each of the one or more scheduled cells operates as a single TRP or multiple TRPs is identified based on the one or more bits.

[0019] According to one embodiment of the present disclosure, the scheduling cell operates as a single TRP, as a single DCI-based multi-TRP, or as a multi DCI-based multi-TRP.

[0020] According to one embodiment of the present disclosure, the identification is based on whether the scheduling cell is operated as the single TRP, the single DCI-based multi-TRP or the multi-DCI-based multi-TRP.

[0021] According to one embodiment of the present disclosure, when the scheduling cell operates as a single TRP, a cell operated as a single DCI-based multi-TRP is not included in the one or more scheduled cells.

[0022] According to one embodiment of the present disclosure, the scheduling cell is a cell operated as a single DCI-based multi-TRP, and the cell operated as a multi-DCI-based multi-TRP is not included in the one or more scheduled cells.

[0023] A method according to one embodiment of the present disclosure further includes a step of receiving information for setting the type of antenna port for the DCI through the upper layer signaling.

[0024] According to one embodiment of the present disclosure, the DCI further includes a field indicating an antenna port for the one or more scheduled cells.

[0025] According to one embodiment of the present disclosure, when the type of the antenna port is set to the first type, the number of bits of the field representing the antenna port is the maximum value among a plurality of candidate values ​​corresponding to a plurality of cells included in the plurality of scheduled cell sets, and each candidate value is one of 4 bits, 5 bits, or 6 bits.

[0026] According to one embodiment of the present disclosure, when the type of the antenna port is set to the second type, the field indicating the antenna port includes one or more blocks corresponding to the one or more scheduled cells, each block indicating an antenna port for the corresponding scheduled cell, and the number of bits of each block is one of 4 bits, 5 bits, or 6 bits.

[0027] A terminal of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive information related to a set of scheduled cells through upper layer signaling; receive DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the set of scheduled cells through a scheduling cell; identify, based on the DCI, whether each of the one or more scheduled cells is operated as a single transmission and reception point (TRP) or multiple TRPs; and perform the data communication through the one or more scheduled cells based on the identification.

[0028] A method performed by a base station in a communication system according to one embodiment of the present disclosure includes the steps of: transmitting information related to a set of scheduled cells through upper layer signaling; transmitting DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the set of scheduled cells through the scheduling cells; and performing the data communication through the one or more scheduled cells.

[0029] According to one embodiment of the present disclosure, the DCI relates to whether each of the one or more scheduled cells operates as a single transmission and reception point (TRP) or as multiple TRPs.

[0030] According to one embodiment of the present disclosure, the DCI includes a scheduled cell set indicator field.

[0031] According to one embodiment of the present disclosure, when the scheduled cell set indicator field is 1 bit, a first code point of the scheduled cell set indicator field indicates that a scheduled cell associated with the scheduled cell set indicator field is operated as a single TRP, and a second code point of the scheduled cell set indicator field indicates that a scheduled cell associated with the scheduled cell set indicator field is operated as a multiple TRP.

[0032] According to one embodiment of the present disclosure, when the scheduled cell set indicator field is 2 bits, the least significant bit (LSB) of the scheduled cell set indicator field indicates a scheduled cell associated with the scheduled cell set indicator field, and the most significant bit (MSB) of the scheduled cell set indicator field indicates whether the scheduled cell indicated by the LSB is operated as a single TRP or as multiple TRPs.

[0033] According to one embodiment of the present disclosure, the DCI includes one or more transmission configuration indication (TCI) state fields corresponding to the one or more scheduled cells, and the one or more TCI state fields are sorted in ascending order of indices of the one or more scheduled cells.

[0034] According to one embodiment of the present disclosure, when a code point of a TCI status field indicates multiple TCI states, a scheduled cell corresponding to the TCI status field is operated as a multiple TRP.

[0035] According to one embodiment of the present disclosure, when a code point of a TCI status field indicates one TCI status, a scheduled cell corresponding to the TCI status field is operated as a single TRP.

[0036] According to one embodiment of the present disclosure, the DCI includes a field related to a CORESET (control resource set) pool index, and one or more bits included in the field related to the CORESET pool index correspond to the one or more scheduled cells.

[0037] According to one embodiment of the present disclosure, whether each of the one or more scheduled cells operates as a single TRP or multiple TRPs is related to the one or more bits.

[0038] According to one embodiment of the present disclosure, the scheduling cell operates as a single TRP, as a single DCI-based multi-TRP, or as a multi DCI-based multi-TRP.

[0039] According to one embodiment of the present disclosure, when the scheduling cell operates as a single TRP, a cell operated as a single DCI-based multi-TRP is not included in the one or more scheduled cells.

[0040] According to one embodiment of the present disclosure, the scheduling cell is a cell operated as a single DCI-based multi-TRP, and the cell operated as a multi-DCI-based multi-TRP is not included in the one or more scheduled cells.

[0041] A method according to one embodiment of the present disclosure further includes a step of transmitting information setting a type of an antenna port for the DCI through the upper layer signaling.

[0042] According to one embodiment of the present disclosure, the DCI further includes a field indicating an antenna port for the one or more scheduled cells.

[0043] According to one embodiment of the present disclosure, when the type of the antenna port is set to the first type, the number of bits of the field representing the antenna port is the maximum value among a plurality of candidate values ​​corresponding to a plurality of cells included in the plurality of scheduled cell sets, and each candidate value is one of 4 bits, 5 bits, or 6 bits.

[0044] According to one embodiment of the present disclosure, when the type of the antenna port is set to the second type, the field indicating the antenna port includes one or more blocks corresponding to the one or more scheduled cells, each block indicating an antenna port for the corresponding scheduled cell, and the number of bits of each block is one of 4 bits, 5 bits, or 6 bits.

[0045] A base station of a communication system according to one embodiment of the present disclosure includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: transmit information related to a set of scheduled cells through upper layer signaling; transmit DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the set of scheduled cells through a scheduling cell; and perform the data communication through the one or more scheduled cells.

[0046] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0047] The disclosed embodiment provides a device and method capable of effectively providing a service in a mobile communication system.

[0048] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0049] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0050] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0051] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0052] FIG. 4 is a diagram illustrating an example of base station beam allocation according to a transmission configuration indicator (TCI) state setting in a wireless communication system according to an embodiment of the present disclosure.

[0053] FIG. 5 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to one embodiment of the present disclosure.

[0054] FIG. 6 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0055] FIG. 7 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0056] FIG. 8 is a diagram illustrating an example of a TCI state allocation method for a PDCCH in a wireless communication system according to one embodiment of the present disclosure.

[0057] FIG. 9 is a diagram illustrating a TCI indication MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to one embodiment of the present disclosure.

[0058] FIG. 10 is a diagram illustrating an example of a control resource set and a beam setting of a search space in a wireless communication system according to one embodiment of the present disclosure.

[0059] FIG. 11 is a diagram illustrating an example of frequency axis resource allocation of a PDSCH (physical downlink shared channel) in a wireless communication system according to one embodiment of the present disclosure.

[0060] FIG. 12 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0061] Figure 13 illustrates a process for beam setting and activation of PDSCH.

[0062] FIG. 14 is a diagram illustrating an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0063] FIG. 15 is a diagram illustrating an example of configuring downlink control information (DCI) for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0064] Figure 16 is a diagram showing the Enhanced PDSCH TCI state activation / deactivation MAC-CE structure.

[0065] FIG. 17 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to one embodiment of the present disclosure.

[0066] FIG. 18 is a diagram of a beam application time that can be considered when using an integrated TCI method in a wireless communication system according to one embodiment of the present disclosure.

[0067] FIG. 19 is a diagram illustrating a single TRP-based multi-cell scheduling operation for transmitting multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0068] FIG. 20 is a diagram illustrating a multi-cell scheduling operation of a single DCI-based multiple TRP transmitting multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0069] FIG. 21A is a diagram illustrating a multi-cell scheduling operation of multiple DCI-based multiple TRPs that transmit multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0070] FIG. 21B is a diagram illustrating a multi-cell scheduling operation of multiple DCI-based multiple TRPs that transmit multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0071] FIG. 21C is a diagram illustrating a multi-cell scheduling operation of multiple DCI-based multiple TRPs that transmit multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0072] FIG. 22 is a diagram illustrating the operation of a terminal according to one embodiment of the present disclosure.

[0073] FIG. 23 is a diagram illustrating the operation of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0074] FIG. 24 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0075] FIG. 25 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0076] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0077] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0078] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0079] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and these may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0080] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0081] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0082] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0083] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0084] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0085] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0086] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0087] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum 20 MHz transmission bandwidth in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by utilizing a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz bands.

[0088] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage due to the nature of the service, and thus may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0089] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, URLLC-enabled services must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of 10-5 or lower. Therefore, for URLLC-enabled services, 5G systems must provide shorter Transmit Time Intervals (TTIs) than other services, while simultaneously allocating extensive resources in the frequency band to ensure communication link reliability.

[0090] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0091] Hereinafter, a / b can be understood as at least one of a or b.

[0092] [NR time-frequency resources]

[0093] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0094] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0095] The horizontal axis of Fig. 1 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of resources is a resource element (RE, 101), which can be defined as 1 OFDM symbol (102) in the time axis and 1 subcarrier (103) in the frequency axis. In the frequency domain, N_SC^RB (for example, 12) consecutive REs can constitute one resource block (RB, 104). In the time axis, one subframe (110) can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0096] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0097] Figure 2 illustrates an example of a structure of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202). One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) is a setting value for the subcarrier spacing. (204, 205) may vary. In the example of Fig. 2, the subcarrier spacing setting value is If =0(204) The case where =1(205) is shown. If =0(204), 1 subframe (201) can be composed of 1 slot (202), =1(205), 1 subframe (201) can be composed of 2 slots (203). That is, the setting value for the subcarrier spacing Number of slots per subframe according to ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Each subcarrier spacing setting According to and can be defined as [Table 1] below.

[0098] [Table 1]

[0099]

[0100] [Bandwidth Part (BWP)]

[0101] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0102] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0103] FIG. 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] below for each bandwidth portion.

[0104] [Table 2]

[0105]

[0106] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion can be configured for the terminal. The above information can be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the configured one or more bandwidth portions can be activated. Whether or not the configured bandwidth portion is activated can be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI.

[0107] According to some embodiments, a terminal before RRC connection can be configured with an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, the terminal can receive configuration information about a control resource set (CORESET) and a search space in which a PDCCH for receiving system information required for initial access (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) and search space can be transmitted through the MIB during the initial access phase. The control space and search space configured by the MIB can each be regarded as identifier (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control space #0 through the MIB. Additionally, the base station can notify the terminal of the monitoring cycle and monitoring occasion settings for control area #0, i.e., search space #0, via the MIB. The terminal can consider the frequency range set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. At this time, the identifier (ID) of the initial bandwidth portion can be considered as 0.

[0108] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0109] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0110] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0111] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0112] In the method for setting the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the Physical Downlink Shared Channel (PDSCH) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (Other System Information (OSI), paging, and random access).

[0113] [Bandwidth Part (BWP) Change]

[0114] When one or more bandwidth part values ​​are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part value using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (301), the base station can instruct the terminal to bandwidth part #2 (302) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (302) indicated by the bandwidth part indicator in the received DCI.

[0115] As mentioned above, since DCI-based bandwidth part changes can be indicated by DCI scheduling PDSCH or PUSCH, when a UE receives a bandwidth part change request, it must be able to seamlessly receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI in the changed bandwidth part. To this end, the standard stipulates requirements for the delay time (TBWP) required when changing the bandwidth part, which can be defined, for example, as shown in [Table 3] below.

[0116] [Table 3]

[0117]

[0118] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0119] According to the requirement for bandwidth part change delay time mentioned above, when the terminal receives DCI including bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T. BWP The completion can be done at a later time, and transmission and reception for the data channel scheduled by the DCI can be performed in the new bandwidth portion that has been changed. When the base station wants to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP ), time domain resource allocation for the data channel can be determined. That is, when the base station schedules the data channel with a new bandwidth portion, the data channel can be scheduled after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal can determine whether the DCI instructing the bandwidth portion change is after the bandwidth portion change delay time (T BWP) may not be expected to indicate a slot offset (K0 or K2) value smaller than that.

[0120] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period from the third symbol of the slot in which the PDCCH including the DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0121] [CA / DC related]

[0122] FIG. 5 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation according to one embodiment of the present disclosure.

[0123] Referring to FIG. 5, the wireless protocol of the next-generation mobile communication system is composed of NR SDAP (Service Data Adaptation Protocol S25, S70), NR PDCP (Packet Data Convergence Protocol S30, S65), NR RLC (Radio Link Control S35, S60), and NR MAC (Medium Access Control S40, S55) in the terminal and NR base station, respectively.

[0124] Key features of NR SDAP (S25, S70) may include some of the following:

[0125] - Transfer of user plane data

[0126] - Mapping function between QoS flow and data bearer for both DL and UL

[0127] - Marking function of QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0128] - Ability to map reflective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0129] For the above SDAP layer device, the terminal can be configured by an RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can instruct the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0130] The main functions of NR PDCP (S30, S65) may include some of the following functions:

[0131] - Header compression and decompression (ROHC only)

[0132] - User data transfer function

[0133] - In-sequence delivery of upper layer PDUs

[0134] - Out-of-sequence delivery of upper layer PDUs

[0135] - PDCP PDU reordering for reception

[0136] - Duplicate detection of lower layer SDUs

[0137] - Retransmission function (Retransmission of PDCP SDUs)

[0138] - Encryption and decryption functions (Ciphering and deciphering)

[0139] - Timer-based SDU discard in uplink.

[0140] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function of transmitting data directly without considering the order, a function of recording lost PDCP PDUs by reordering the order, a function of reporting a status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0141] The main functions of NR RLC (S35, S60) may include some of the following functions:

[0142] - Data transfer function (Transfer of upper layer PDUs)

[0143] - In-sequence delivery of upper layer PDUs

[0144] - Out-of-sequence delivery of upper layer PDUs

[0145] - ARQ function (Error Correction through ARQ)

[0146] - Concatenation, segmentation and reassembly of RLC SDUs

[0147] - Re-segmentation of RLC data PDUs

[0148] - Reordering of RLC data PDUs

[0149] - Duplicate detection function

[0150] - Protocol error detection

[0151] - RLC SDU discard function

[0152] - RLC re-establishment function

[0153] In the above, the in-sequence delivery function of the NR RLC device refers to the function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering a single RLC SDU when it is received divided into multiple RLC SDUs, a function of rearranging received RLC PDUs based on the RLC SN (sequence number) or PDCP SN (sequence number), a function of recording lost RLC PDUs by rearranging the order, a function of reporting the status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs. The in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer only the RLC SDUs up to the lost RLC SDU when there is a lost RLC SDU, or may include a function to sequentially deliver to the upper layer all RLC SDUs received before the timer starts if a predetermined timer has expired even if there is a lost RLC SDU. Alternatively, the in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer all RLC SDUs received up to the present if a predetermined timer has expired even if there is a lost RLC SDU.In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a complete RLC PDU, processed, and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0154] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when one RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing and arranging the RLC SN or PDCP SN of received RLC PDUs to record lost RLC PDUs.

[0155] NR MAC (S40, S55) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0156] - Mapping function (Mapping between logical channels and transport channels)

[0157] - Multiplexing / demultiplexing of MAC SDUs

[0158] - Scheduling information reporting function

[0159] - HARQ function (Error correction through HARQ)

[0160] - Priority handling between logical channels of one UE

[0161] - Priority handling between UEs by means of dynamic scheduling

[0162] - MBMS service identification function

[0163] - Transport format selection function

[0164] - Padding function

[0165] The NR PHY layer (S45, S50) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it over a wireless channel, or demodulating and channel decoding OFDM symbols received over a wireless channel and transmitting them to a higher layer.

[0166] The above wireless protocol structure can have various detailed structures depending on the carrier (or cell) operation method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure that has a single structure for each layer, such as S00. On the other hand, when a base station transmits data to a terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure that has a single structure up to RLC, but multiplexes the PHY layer through the MAC layer, such as S10. As another example, when a base station transmits data to a terminal based on DC (dual connectivity) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure that has a single structure up to RLC, but multiplexes the PHY layer through the MAC layer, such as S20.

[0167] [QCL, TCI state]

[0168] In a wireless communication system, one or more different antenna ports (or one or more channels, signals, and combinations thereof, but for convenience, they will be referred to as different antenna ports in the following description of the present disclosure) can be associated with each other by a QCL (Quasi co-location) setting as shown in [Table 4] below. The TCI state is to notify the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels. When a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCLed with each other, it means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at the antenna port A to the channel measurement from the antenna port B. QCL may need to relate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Accordingly, NR supports four types of QCL relationships, as shown in [Table 4] below.

[0169] [Table 4]

[0170]

[0171] The above spatial RX parameter may collectively refer to some or all of various parameters, such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0172] The above QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in Table 9 below. Referring to [Table 5], the base station can set one or more TCI states to the terminal and inform the RS referencing the ID of the TCI state, i.e., up to two QCL relationships (qcl-Type1, qcl-Type2) for the target RS. At this time, each QCL information (QCL-Info) included in the above TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in [Table 4] above.

[0173] [Table 5]

[0174]

[0175] Figure 4 is a diagram illustrating an example of base station beam allocation according to TCI state settings.

[0176] Referring to FIG. 4, the base station can transmit information about N different beams to the terminal through N different TCI states. For example, in case of N=3 as shown in FIG. 4, the base station can notify that the antenna ports referencing the different TCI states 400, 405, or 410 have different spatial Rx parameters, i.e., are associated with different beams, by setting the qcl-Type2 parameter included in the three TCI states (400, 405, 410) to be associated with the CSI-RS or SSB corresponding to the different beams and to QCL type D.

[0177] Tables 6 to 10 below show valid TCI state settings according to target antenna port type.

[0178] [Table 6] shows valid TCI state settings when the target antenna port is CSI-RS for tracking (i.e., TRS). The TRS refers to NZP CSI-RS with the repetition parameter not set and trs-Info set to true among CSI-RSs. Setting 3 in Table 10 can be used for aperiodic TRS.

[0179] [Table 6]

[0180] Set a valid TCI state when the target antenna port is CSI-RS for tracking (TRS).

[0181]

[0182] [Table 7] shows valid TCI state settings when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a parameter indicating repetition (e.g., repetition parameter) is not set among the CSI-RSs and trs-Info is not set to true.

[0183] [Table 7]

[0184] Set a valid TCI state when the target antenna port is CSI-RS for CSI.

[0185]

[0186] [Table 8] shows the valid TCI state settings when the target antenna port is CSI-RS for beam management (BM, which has the same meaning as CSI-RS for L1 RSRP reporting). The CSI-RS for BM refers to an NZP CSI-RS in which the repetition parameter is set to On or Off among CSI-RSs and trs-Info is not set to true.

[0187] [Table 8]

[0188] Set a valid TCI state when the target antenna port is CSI-RS for BM (for L1 RSRP reporting).

[0189]

[0190] [Table 9] shows the valid TCI state settings when the target antenna port is PDCCH DMRS.

[0191] [Table 9]

[0192] Set a valid TCI state when the target antenna port is PDCCH DMRS.

[0193]

[0194] [Table 10] shows the valid TCI state settings when the target antenna port is PDSCH DMRS.

[0195] [Table 10]

[0196] Set a valid TCI state when the target antenna port is PDSCH DMRS.

[0197]

[0198] A representative QCL configuration method according to the above [Table 6] to [Table 10] is to operate by setting the target antenna port and reference antenna port for each step as “SSB” -> “TRS” -> “CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS.” Through this, it is possible to link statistical characteristics that can be measured from SSB and TRS to each antenna port to assist the terminal’s reception operation.

[0199] [Unified TCI state]

[0200] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme can refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used for downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used for uplink transmission, into a TCI state. Therefore, when the terminal is instructed by the base station based on the unified TCI scheme, it can perform beam management using the TCI state even for uplink transmission. If the terminal has set a TCI-State, which is an upper layer signaling with the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform operations based on the unified TCI scheme using the corresponding TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0201] The first type is a joint TCI state, and the terminal can be instructed by the base station to use both the TCI state to apply to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state to instruct the parameters to use for downlink channel estimation, and the RS corresponding to qcl-Type2 to instruct the parameters to use as a downlink reception beam or reception filter. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state to instruct the parameters to use as an uplink transmission beam or transmission filter. In this case, if the terminal is instructed to use a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0202] The second form is a separate TCI state, in which the terminal can be individually instructed by the base station to select a UL TCI state to apply to uplink transmission and a DL TCI state to apply to downlink reception. If the terminal is instructed to select a UL TCI state, the terminal can be instructed to select parameters to use as an uplink transmission beam or transmission filter using the reference RS or source RS configured in the UL TCI state. If the terminal is instructed to select a DL TCI state, the terminal can be instructed to select parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the DL TCI state, and to select parameters to use as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0203] If the terminal is instructed with both the DL TCI state and the UL TCI state, the terminal can be instructed with parameters to be used as an uplink transmission beam or a transmission filter using the reference RS or source RS set in the corresponding UL TCI state, and can be instructed with parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the corresponding DL TCI state, and can be instructed with parameters to be used as a downlink reception beam or a reception filter using the RS corresponding to qcl-Type2. In this case, if the reference RS or source RS set in the DL TCI state and UL TCI state to which the terminal is instructed are different, the terminal can individually apply beams to uplink transmission and downlink reception, respectively, based on the instructed UL TCI state and DL TCI state.

[0204] A terminal can receive a joint TCI state from a base station for each bandwidth part within a specific cell through upper layer signaling up to 128 times, and among the separate TCI states, a DL TCI state can be set for each bandwidth part within a specific cell up to 64 or 128 times through upper layer signaling based on a terminal capability report. Among the separate TCI states, the DL TCI state and the joint TCI state can use the same upper layer signaling structure. For example, if 128 joint TCI states are set and 64 DL TCI states are set among the separate TCI states, the 64 DL TCI states can be included in the 128 joint TCI states.

[0205] Among the separate TCI states, the UL TCI state can be set to a maximum of 32 or 64 upper layer signaling for each specific bandwidth part within a specific cell based on the terminal capability report, and like the relationship between the DL TCI state and the joint TCI state among the separate TCI states, the UL TCI state and the joint TCI state among the separate TCI can also use the same upper layer signaling structure, and the UL TCI state among the separate TCI can use different upper layer signaling structures from the joint TCI state and the DL TCI state among the separate TCI states.

[0206] The use of different or identical upper layer signaling structures may be defined in the specification, or may be distinguished through another upper layer signaling established by the base station based on a terminal capability report containing information on which of the two usage modes the terminal can support.

[0207] The terminal can receive transmission and reception beam-related instructions in an integrated TCI manner using one of the joint TCI state and separate TCI state configured by the base station. The terminal can be configured by the base station via upper layer signaling whether to use either the joint TCI state or separate TCI state.

[0208] The terminal receives transmission / reception beam-related instructions using one of the methods selected from the joint TCI state and the separate TCI state through upper layer signaling. At this time, there may be two transmission / reception beam instruction methods from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0209] If a terminal receives a transmission / reception beam-related instruction using a joint TCI state method through upper layer signaling, the terminal can perform a transmission / reception beam application operation by receiving a MAC-CE indicating the joint TCI state from a base station, and the base station can schedule reception of a PDSCH including the MAC-CE through a PDCCH for the terminal. If the MAC-CE includes one joint TCI state, the UE can use the indicated joint TCI state to determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. If the MAC-CE includes two or more joint TCI states, the UE can confirm that the multiple joint TCI states indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. Then, the UE can receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may or may not include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0210] If a terminal receives an instruction related to a transmit / receive beam using a separate TCI state method through upper layer signaling, the terminal can perform a transmit / receive beam application operation by receiving a MAC-CE indicating a separate TCI state from a base station, and the base station can schedule reception of a PDSCH including the corresponding MAC-CE to the terminal through a PDCCH. If the MAC-CE includes only one set of separate TCI states, the terminal can determine an uplink transmit beam or transmit filter and a downlink receive beam or receive filter using the separate TCI states included in the indicated separate TCI state set starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the corresponding PDSCH was successful. At this time, the separate TCI state set may mean single or multiple separate TCI states that one code point of the TCI state field in DCI format 1_1 or 1_2 can have, and one separate TCI state set may include one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state. If there are two or more separate TCI state sets included in the MAC-CE, the UE may confirm that the multiple separate TCI state sets indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting from 3 ms after transmitting the PUCCH including HARQ-ACK information indicating whether reception for the corresponding PDSCH was successful, and may activate the indicated separate TCI state set.At this time, each code point of the TCI state field of DCI format 1_1 or 1_2 can indicate one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state each. The terminal can receive DCI format 1_1 or 1_2 and apply a separate set of TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0211] FIG. 18 is a diagram illustrating beam application times that may be considered when using an integrated TCI scheme in a wireless communication system according to an embodiment of the present disclosure. As described above, a terminal may receive DCI format 1_1 or 1_2 from a base station, including (with DL assignment) or not including (without DL assignment) downlink data channel scheduling information, and apply one joint TCI state or a set of separate TCI states indicated by the TCI state field in the corresponding DCI to uplink transmission and downlink reception beams.

[0212] - DCI format 1_1 or 1_2 with DL assignment (1800): If the terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from the base station (1801) and indicates one joint TCI state or a separate TCI state set based on the integrated TCI method, the terminal receives a PDSCH scheduled based on the received DCI (1805), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH was successful (1810). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH was successful, and if at least one of the DCI and the PDSCH was not received, the terminal can transmit a NACK, and if reception of both was successful, the terminal can transmit an ACK.

[0213] - DCI format 1_1 or 1_2 without DL assignment (1850): If the terminal receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information (1855) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI method, the terminal may assume at least one combination of the following for the corresponding DCI.

[0214] ■ Includes scrambled CRC using CS-RNTI.

[0215] ■ The value of all bits assigned to all fields used as RV (Redundancy Version) fields is 1.

[0216] ■ The value of all bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields is 1.

[0217] ■ The value of all bits assigned to all fields used as NDI (New Data Indication) fields is 0.

[0218] ■ For FDRA (Frequency Domain Resource Allocation) Type 0, the value of all bits allocated to the FDRA field is 0, for FDRA Type 1, the value of all bits allocated to the FDRA field is 1, and when the FDRA method is dynamicSwitch, the value of all bits allocated to the FDRA field is 0.

[0219] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 assuming the above-described matters (1860).

[0220] - For both DCI format 1_1 or 1_2 with DL assignment (1800) and without DL assignment (1850), if the new TCI state indicated through DCI (1801, 1855) is the same as the TCI state that has already been indicated and applied to the uplink transmission and downlink reception beams, the terminal may maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the terminal may determine the application time of the joint TCI state or the separate TCI state set that can be indicated from the TCI state field included in the DCI as the time after the first slot (1820, 1870) after the time equal to the BAT (beam application time, 1815, 1865) after the PUCCH transmission (1830, 1880), and until (1825, 1875) before the corresponding slot (1820, 1870). TCI-state is available.

[0221] - For both DCI format 1_1 or 1_2 with DL assignment (1800) and without DL assignment (1850), the BAT can be set by upper layer signaling based on terminal capability report information as a specific number of OFDM symbols, and the numerology for the BAT and the first slot after the BAT can be determined based on the smallest numerology among all cells to which the joint TCI state or separate TCI state set indicated through the DCI is applied.

[0222] A terminal can apply one joint TCI state indicated via MAC-CE or DCI to reception of control resource sets connected to all terminal-specific search spaces, reception of PDSCHs scheduled as PDCCHs transmitted from the control resource sets, transmission of PUSCHs, and transmission of all PUCCH resources.

[0223] A terminal may apply one separate TCI state set, if one separate TCI state set indicated via MAC-CE or DCI includes one DL TCI state, to reception for control resource sets connected to all terminal-specific search spaces, to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and to all PUSCH and PUCCH resources based on the previously indicated UL TCI state.

[0224] A terminal can apply a separate TCI state set indicated via MAC-CE or DCI to all PUSCH and PUCCH resources if it includes one UL TCI state, and can apply it to reception of control resource sets connected to all terminal-specific search spaces based on previously indicated DL TCI states, and to reception of PDSCH scheduled as PDCCH transmitted from the corresponding control resource set.

[0225] When a separate set of TCI states indicated via MAC-CE or DCI includes one DL TCI state and one UL TCI state, the terminal may apply the DL TCI state to reception for all control resource sets associated with the terminal-specific search space and to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and may apply the UL TCI state to all PUSCH and PUCCH resources.

[0226] [Unified TCI state MAC-CE]

[0227] Hereinafter, a single TCI state indication and activation method based on the integrated TCI scheme is described. The terminal receives a PDSCH including the following MAC-CE from the base station, and from 3 slots after transmitting a HARQ-ACK for the corresponding PDSCH to the base station, the terminal can interpret each code point of the TCI state field in DCI format 1_1 or 1_2 based on the information in the MAC-CE received from the base station. That is, the terminal can activate each entry of the MAC-CE received from the base station to each code point of the TCI state field in DCI format 1_1 or 1_2.

[0228] FIG. 17 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure. The meaning of each field within the MAC-CE structure may be as follows.

[0229] - Serving Cell ID (1700): This field can indicate which serving cell the MAC-CE is applied to. The length of this field can be 5 bits. If the serving cell indicated by this field is included in one or more of the upper layer signaling simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0230] - DL BWP ID (1705): This field can indicate which DL BWP the corresponding MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0231] - UL BWP ID (1710): This field can indicate which UL BWP the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0232] - P i (1715): This field can indicate whether each code point in the TCI state field in DCI format 1_1 or 1_2 has multiple TCI states or a single TCI state. If P i If the value of is 1, it means that the corresponding i-th code point has multiple TCI states, which may mean that the corresponding code point may contain a separate DL TCI state and a separate UL TCI state. If P i If the value is 0, it means that the corresponding ith code point has a single TCI state, which may mean that the corresponding code point may contain either a joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0233] - D / U (1720): This field can indicate whether the TCI state ID field in the same octet is a joint TCI state, a separate DL TCI state, or a separate UL TCI state. If this field is 1, the TCI state ID field in the same octet can be a joint TCI state or a separate DL TCI state, and if this field is 0, the TCI state ID field in the same octet can be a separate UL TCI state.

[0234] - TCI state ID (1725): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the D / U field is set to 1, this field can be used to express the TCI-StateId, which can be expressed in 7 bits. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated can be 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0235] - R: Indicates reserved bit and can be set to 0.

[0236] For the MAC-CE structure of FIG. 17 described above, the terminal can include the third octet including the P1, P2, …, P8 fields in FIG. 17 in the MAC-CE structure, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate. In this case, the terminal can perform TCI state activation using the fixed MAC-CE structure regardless of the upper layer signaling set by the base station. As another example, for the MAC-CE structure of FIG. 17 described above, the terminal can omit the third octet including the P1, P2, …, P8 fields in FIG. 17 when unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint. In this case, the terminal can save up to 8 bits of the payload of the corresponding MAC-CE according to the upper layer signaling set by the base station. In addition, all D / U fields located from the fourth octet to the first bit in Fig. 17 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0237] [PDCCH: DCI related]

[0238] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0239] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields defined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0240] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can determine that the message was transmitted to the UE.

[0241] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a Paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0242] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 11] below.

[0243] [Table 11]

[0244]

[0245] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in [Table 12] below.

[0246] [Table 12]

[0247]

[0248]

[0249] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 13] below.

[0250] [Table 13]

[0251]

[0252] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 14] below.

[0253] [Table 14]

[0254]

[0255] [PDCCH: CORESET, REG, CCE, Search Space]

[0256] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0257] FIG. 6 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. FIG. 6 illustrates an example in which two control regions (Control Region #1 (601), Control Region #2 (602)) are set within a UE bandwidth part (610) in the frequency axis and one slot (620) in the time axis. The control regions (601, 602) may be set to specific frequency resources (603) within the entire UE bandwidth part (610) in the frequency axis. The time axis may be set to one or more OFDM symbols, which may be defined as the control region length (Control Resource Set Duration, 604). Referring to the example illustrated in FIG. 6, Control Region #1 (601) is set to a control region length of two symbols, and Control Region #2 (602) is set to a control region length of one symbol.

[0258] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in [Table 15] below.

[0259] [Table 15]

[0260]

[0261]

[0262] In [Table 15], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control region.

[0263] FIG. 7 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G. According to FIG. 7, the basic unit of time and frequency resources that constitute a control channel can be referred to as a REG (Resource Element Group, 703), and a REG (703) can be defined as 1 OFDM symbol (701) on the time axis and 1 PRB (Physical Resource Block, 702) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (703) to constitute a downlink control channel allocation unit.

[0264] As illustrated in FIG. 7, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 704), 1 CCE (704) can be composed of multiple REGs (703). Taking the REG (703) illustrated in FIG. 7 as an example, the REG (703) can be composed of 12 REs, and if 1 CCE (704) is composed of 6 REGs (703), 1 CCE (704) can be composed of 72 REs. When a downlink control region is set, the region can be composed of multiple CCEs (704), and a specific downlink control channel can be mapped to one or multiple CCEs (704) and transmitted according to the aggregation level (AL) within the control region. CCEs (704) within the control area are distinguished by numbers, and the numbers of the CCEs (704) can be assigned according to a logical mapping method.

[0265] The basic unit of the downlink control channel illustrated in FIG. 7, that is, the REG (703), may include both the REs to which the DCI is mapped and the areas to which the DMRS (705), which is a reference signal for decoding the REs, is mapped. As shown in FIG. 7, three DMRSs (705) may be transmitted within one REG (703). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL = L, one downlink control channel may be transmitted through L CCEs. The terminal must detect a signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels, each of which can be a set of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0266] Search spaces can be categorized into common search spaces and UE-specific search spaces. A certain group of UEs, or all UEs, can search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, can be received by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity and various system parameters.

[0267] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal via higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in [Table 16] below can be included.

[0268] [Table 16]

[0269]

[0270]

[0271] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and may configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0272] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0273] In the common search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these.

[0274] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0275] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0276] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0277] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0278] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0279] In a terminal-specific search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these examples.

[0280] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0281] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0282] The RNTIs specified may follow the definitions and uses below.

[0283] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0284] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0285] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0286] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0287] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0288] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0289] INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0290] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0291] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0292] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0293] The aforementioned specified DCI formats may follow the definitions in [Table 17] below.

[0294] [Table 17]

[0295]

[0296] In 5G, the search space of aggregation level L in the control region p and search space set s can be expressed as in [Mathematical Formula 1] below.

[0297] [Mathematical Formula 1]

[0298]

[0299] - L: Integration level

[0300] - : Carrier Index

[0301] - : Total number of CCEs existing within the control region p

[0302] - : slot index

[0303] - : Number of PDCCH candidates for aggregation level L

[0304] - : PDCCH candidate index of aggregation level L

[0305] -

[0306] -

[0307] - I: Terminal identifier

[0308] The value can be 0 for a common search space.

[0309] In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's identity (C-RNTI or ID set to the terminal by the base station) and the time index.

[0310] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 16]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or can monitor either search space set #1 or search space set #2 in a specific slot.

[0311] [PDCCH: TCI state related]

[0312] Specifically, the TCI state combinations applicable to the PDCCH DMRS antenna port are as shown in [Table 18] below. The fourth row in [Table 18] is the combination assumed by the terminal before RRC configuration, and configuration after RRC is not possible.

[0313] [Table 18]

[0314]

[0315] NR supports a hierarchical signaling method as illustrated in FIG. 8 for dynamic allocation of PDCCH beams. Referring to FIG. 8, a base station can set N TCI states (805, 810, …, 820) to a terminal through RRC signaling (800), and can set some of them as TCI states for CORESET (825). Thereafter, the base station can indicate one of the TCI states (830, 835, 840) for CORESET to the terminal through MAC CE signaling (845). Thereafter, the terminal receives the PDCCH based on beam information included in the TCI state indicated by the MAC CE signaling.

[0316] FIG. 9 is a diagram illustrating a TCI indication MAC CE signaling structure for the PDCCH DMRS. Referring to FIG. 9, the TCI indication MAC CE signaling for the PDCCH DMRS consists of 2 bytes (16 bits) and includes a 5-bit serving cell ID (915), a 4-bit CORESET ID (920), and a 7-bit TCI state ID (925).

[0317] FIG. 10 is a diagram illustrating an example of beam configuration of a control resource set (CORESET) and a search space according to the above description. Referring to FIG. 10, a base station can indicate one of the TCI state lists included in the CORESET (1000) configuration through MAC CE signaling (1005). Thereafter, until another TCI state is indicated to the corresponding CORESET through another MAC CE signaling, the terminal considers that the same QCL information (beam #1, 1005) is applied to all one or more search spaces (1010, 1015, 1020) connected to the CORESET. The above-described PDCCH beam allocation method has a problem in that it is difficult to indicate a beam change faster than the MAC CE signaling delay, and also has a disadvantage in that the same beam is applied to all CORESETs regardless of the search space characteristics, which makes flexible PDCCH beam operation difficult. The embodiments of the present disclosure below provide a more flexible PDCCH beam configuration and operation method. In describing the embodiments of the present disclosure below, several distinct examples are provided for convenience of explanation, but these are not mutually exclusive and can be applied in appropriate combination depending on the situation.

[0318] A base station can set one or more TCI states for a specific control region to a terminal, and can activate one of the set TCI states through a MAC CE activation command. For example, if {TCI state#0, TCI state#1, TCI state#2} are set as TCI states in control region #1, the base station can transmit a command to the terminal to activate TCI state#0 for control region #1 through MAC CE. Based on the activation command for the TCI state received through MAC CE, the terminal can correctly receive DMRS of the corresponding control region based on QCL information in the activated TCI state.

[0319] For a control region (control region #0) with an index set to 0, if the terminal has not received a MAC CE activation command for the TCI state of control region #0, the terminal can assume that it has QCL with the SS / PBCH block identified during the initial access process or the non-contention-based random access process that is not triggered by a PDCCH command for the DMRS transmitted in control region #0.

[0320] For a control region (control region #X) whose index is set to a value other than 0, if the terminal has not set a TCI state for the control region #X, or has set one or more TCI states but has not received a MAC CE activation command to activate one of them, the terminal may assume that the DMRS transmitted in the control region #X is QCL with the SS / PBCH block identified during the initial access process.

[0321] [PDSCH: Frequency Resource Allocation Related]

[0322] FIG. 11 is a diagram illustrating an example of frequency-axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0323] FIG. 11 is a diagram illustrating three frequency axis resource allocation methods, type 0 (1100), type 1 (1105), and dynamic switch (1110), which can be set through an upper layer in an NR wireless communication system.

[0324] Referring to Fig. 11, if a terminal is set to use only resource type 0 through upper layer signaling (1100), some downlink control information (DCI) that allocates PDSCH to the terminal includes a bitmap consisting of N_RBG bits. The conditions for this will be explained later. At this time, N_RBG means the number of RBGs (resource block groups) determined as shown in [Table 19] below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, and data is transmitted to the RBG indicated as 1 by the bitmap.

[0325] [Table 19]

[0326]

[0327] If the terminal is configured to use only resource type 1 through upper layer signaling (1105), some DCIs that allocate PDSCH to the terminal It includes frequency axis resource allocation information consisting of bits. The conditions for this will be explained later. Through this, the base station can set the starting VRB (1120) and the length (1125) of frequency axis resources allocated continuously therefrom.

[0328] If a terminal is configured to use both resource type 0 and resource type 1 through upper layer signaling (1110), some DCIs that allocate PDSCH to the terminal include frequency-axis resource allocation information composed of bits of a larger value (1135) among payload (1115) for configuring resource type 0 and payload (1120, 1125) for configuring resource type 1. Conditions for this will be explained later. At this time, one bit (1130) may be added to the first part (MSB) of the frequency-axis resource allocation information in the DCI, and if the bit (1130) has a value of '0', it may indicate that resource type 0 is used, and if it has a value of '1', it may indicate that resource type 1 is used.

[0329] [PDSCH / PUSCH: Time Resource Allocation Related]

[0330] Below, a time domain resource allocation method for data channels in next-generation mobile communication systems (5G or NR systems) is described.

[0331] A base station can set up a table for time domain resource allocation information for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) to a terminal via higher layer signaling (e.g., RRC signaling). A table with up to maxNrofDL-Allocations=16 entries can be set up for the PDSCH, and a table with up to maxNrofUL-Allocations=16 entries can be set up for the PUSCH. In one embodiment, the time domain resource allocation information may include PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time point at which a PDCCH is received and the time point at which a PDSCH scheduled by the received PDCCH is transmitted, denoted as K0), PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time point at which a PDCCH is received and the time point at which a PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information on the position and length of the start symbol at which a PDSCH or PUSCH is scheduled within a slot, a mapping type of the PDSCH or PUSCH, etc. For example, information such as [Table 20] or [Table 21] below may be transmitted from the base station to the terminal.

[0332] [Table 20]

[0333]

[0334] [Table 21]

[0335]

[0336] The base station may notify the terminal of one of the entries in the table for the time domain resource allocation information described above via L1 signaling (e.g., DCI) (e.g., indicated by the 'Time Domain Resource Allocation' field in the DCI). The terminal may obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

[0337] FIG. 12 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0338] Referring to FIG. 12, the base station can indicate the time axis position of the PDSCH resource according to the subcarrier spacing (SCS) (μPDSCH, μPDCCH) of the data channel and control channel set using the upper layer, the scheduling offset (K0) value, and the start position (1200) and length (1205) of an OFDM symbol within a slot dynamically indicated through DCI.

[0339] [PDSCH: TCI state activation MAC-CE]

[0340] Figure 13 illustrates a process for beam configuration and activation of a PDSCH. A list of TCI states for a PDSCH can be indicated through a list of upper layers such as RRC (1300). The list of TCI states can be indicated, for example, as tci-StatesToAddModList and / or tci-StatesToReleaseList in the PDSCH-Config IE for each BWP. Next, some of the list of TCI states can be activated through MAC-CE (1320). Among the TCI states activated through the MAC-CE, a TCI state for the PDSCH can be indicated through DCI (1340). The maximum number of activated TCI states can be determined according to the capability reported by the UE. (1350) illustrates an example of a MAC-CE structure for PDSCH TCI state activation / deactivation.

[0341] The meaning of each field in the above MAC CE and the values ​​that can be set for each field are as follows [Table 22].

[0342] [Table 22]

[0343]

[0344] [Regarding terminal capability reporting]

[0345] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0346] A base station can transmit a UE capability inquiry message requesting a capability report to a connected terminal. The message can include a UE capability request for each RAT (radio access technology) type of the base station. The RAT type-specific request can include information on a combination of supported frequency bands, etc. In addition, in the case of the UE capability inquiry message, UE capabilities for multiple RAT types can be requested through a single RRC message container transmitted by the base station, or the base station can include multiple UE capability inquiry messages including UE capability requests for each RAT type and transmit them to the terminal. That is, the UE capability inquiry can be repeated multiple times in one message, and the terminal can compose a corresponding UE capability information message and report it multiple times. In the next-generation mobile communication system, a UE capability request can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). Additionally, the terminal capability inquiry message is typically transmitted initially after the terminal is connected to the base station, but the base station may request it under any conditions when necessary.

[0347] In the above step, the terminal that receives the UE capability report request from the base station configures the terminal capability based on the RAT type and band information requested from the base station. Below is a summary of how the terminal configures the UE capability in the NR system.

[0348] 1. If the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. Furthermore, the bands are prioritized in the order listed in FreqBandList.

[0349] 2. If the base station requests UE capability reporting by setting the “eutra-nr-only” flag or the “eutra” flag, the UE completely removes NR SA BCs from the list of configured BC candidates. This operation can only occur when the LTE base station (eNB) requests the “eutra” capability.

[0350] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC refers to a BC obtained by removing at least one band corresponding to an SCell from a random BC. Since the BC before removing the band corresponding to at least one SCell can already cover the fallback BC, this step can be omitted. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0351] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final “candidate BC list” above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report in the order of the preset rat-Type (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of “candidate feature set combinations” from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The “candidate feature set combinations” above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0352] 5. Also, if the requested rat Type is eutra-nr and has influence, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set is included only in UE-NR-Capabilities.

[0353] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0354] [NC-JT related]

[0355] According to one embodiment of the present disclosure, Non-Coherent Joint Transmission (NC-JT) may be used for a terminal to receive PDSCH from multiple TRPs.

[0356] Unlike existing systems, 5G wireless communication systems can support not only services requiring high transmission speeds, but also services with very short transmission delays and high connection density. In a wireless communication network comprising multiple cells, transmission and reception points (TRPs), or beams, coordinated transmission between each cell, TRP, or / and beam can increase the signal strength received by a terminal or efficiently control interference between each cell, TRP, or / and beam, thereby satisfying diverse service requirements.

[0357] Joint Transmission (JT) is a representative transmission technology for the aforementioned cooperative communication, which increases the signal strength or processing rate received by a terminal by transmitting a signal to a single terminal through a number of different cells, TRPs, or / and beams. At this time, the channel between each cell, TRP, or / and beam and the terminal may have significantly different characteristics, and in particular, in the case of Non-Coherent Joint Transmission (NC-JT) that supports non-coherent precoding between each cell, TRP, or / and beam, individual precoding, MCS, resource allocation, TCI indication, etc. may be required depending on the channel characteristics of each link between each cell, TRP, or / and beam and the terminal.

[0358] The above-described NC-JT transmission can be applied to at least one channel among the downlink data channel (PDSCH), downlink control channel (PDCCH), uplink data channel (PUSCH), and uplink control channel (PUCCH). When transmitting PDSCH, transmission information such as precoding, MCS, resource allocation, and TCI are indicated as DL DCI, and for NC-JT transmission, the transmission information must be independently indicated for each cell, TRP, and / or beam. This is a major factor that increases the payload required for DL ​​DCI transmission, and this may adversely affect the reception performance of the PDCCH transmitting the DCI. Therefore, in order to support JT of PDSCH, it is necessary to carefully design a tradeoff between the amount of DCI information and the reception performance of control information.

[0359] FIG. 14 is a diagram illustrating an example of an antenna port configuration and resource allocation for transmitting a PDSCH using cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0360] Referring to FIG. 14, examples for PDSCH transmission are explained for each technique of joint transmission (JT), and examples for allocating radio resources for each TRP are shown.

[0361] Referring to FIG. 14, an example (1400) for coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP or / and beam is illustrated.

[0362] In the case of C-JT, TRP A (1405) and TRP B (1410) transmit a single data (PDSCH) to the terminal (1415), and joint precoding can be performed on multiple TRPs. This may mean that DMRS is transmitted through the same DMRS ports for TRP A (1405) and TRP B (1410) to transmit the same PDSCH. For example, TRP A (1405) and TRP B (1410) may each transmit DRMS ​​to the terminal through DMRS port A and DMRS B. In this case, the terminal may receive one DCI information for receiving one PDSCH that is demodulated based on the DMRS transmitted through DMRS port A and DMRS B.

[0363] FIG. 14 illustrates an example (1420) of Non-Coherent Joint Transmission (NC-JT) supporting non-coherent precoding between each cell, TRP, or / and beam for PDSCH transmission.

[0364] In the case of NC-JT, PDSCH is transmitted to the terminal (1435) for each cell, TRP or / and beam, and individual precoding can be applied to each PDSCH. Each cell, TRP or / and beam transmits a different PDSCH or a different PDSCH layer to the terminal, thereby improving the throughput compared to single cell, TRP or / and beam transmission. In addition, each cell, TRP or / and beam repeatedly transmits the same PDSCH to the terminal, thereby improving the reliability compared to single cell, TRP or / and beam transmission. For convenience of explanation, cells, TRPs or / and beams are collectively referred to as TRPs hereinafter.

[0365] At this time, various wireless resource allocations can be considered, such as when the frequency and time resources used by multiple TRPs for PDSCH transmission are all the same (1440), when the frequency and time resources used by multiple TRPs do not overlap at all (1445), and when some of the frequency and time resources used by multiple TRPs overlap (1450).

[0366] To support NC-JT, DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single terminal.

[0367] FIG. 15 is a diagram illustrating an example of a configuration of downlink control information (DCI) for NC-JT in which each TRP transmits a different PDSCH or a different PDSCH layer to a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0368] Referring to FIG. 15, case #1 (1500) is an example in which, in addition to the serving TRP (TRP#0) used for single PDSCH transmission, (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)), and control information for PDSCHs transmitted from the (N-1) additional TRPs is transmitted independently from the control information for the PDSCHs transmitted from the serving TRP. That is, the terminal can obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through independent DCIs (DCI#0 to DCI#(N-1)). The formats between the independent DCIs may be the same or different, and the payloads between the DCIs may also be the same or different. In the aforementioned case #1, each PDSCH control or allocation freedom can be fully guaranteed, but if each DCI is transmitted in different TRPs, coverage differences may occur for each DCI, which may deteriorate reception performance.

[0369] Case #2 (1505) shows an example in which, in addition to the serving TRP (TRP#0) used for single PDSCH transmission, (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)), control information (DCI) for the PDSCHs of the (N-1) additional TRPs is transmitted respectively, and each of these DCIs is dependent on the control information for the PDSCH transmitted from the serving TRP.

[0370] For example, in the case of DCI#0, which is control information for a PDSCH transmitted from a serving TRP (TRP#0), it includes all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, but in the case of shortened DCI (hereinafter, sDCI) (sDCI#0 to sDCI#(N-2)), which is control information for PDSCHs transmitted from cooperative TRPs (TRP#1 to TRP#(N-1)), it may include only some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2. Therefore, in the case of sDCI, which transmits control information for PDSCHs transmitted from cooperative TRPs, since the payload is smaller than that of normal DCI (nDCI), which transmits PDSCH-related control information transmitted from a serving TRP, it is possible to include reserved bits compared to nDCI.

[0371] In the aforementioned case #2, the degree of freedom in controlling or allocating each PDSCH may be limited depending on the content of the information elements included in sDCI, but since the reception performance of sDCI is superior to that of nDCI, the probability of a difference in coverage by DCI may be reduced.

[0372] Case #3 (1510) shows an example in which, in a situation in which (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for single PDSCH transmission, one control information for the PDSCHs of the (N-1) additional TRPs is transmitted, and this DCI is dependent on the control information for the PDSCH transmitted from the serving TRP.

[0373] For example, in the case of DCI#0, which is control information for PDSCH transmitted from a serving TRP (TRP#0), it includes all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, and in the case of control information for PDSCHs transmitted from cooperative TRPs (TRP#1 to TRP#(N-1)), it is possible to collect only some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 into one 'secondary' DCI (sDCI) and transmit them. For example, the sDCI may include at least one piece of information among HARQ-related information such as frequency domain resource assignment, time domain resource assignment, and MCS of cooperative TRPs. In addition, for information not included in sDCI, such as BWP (bandwidth part) indicator or carrier indicator, the DCI (DCI#0, normal DCI, nDCI) of serving TRP can be followed.

[0374] Case #3 (1510) may have limited freedom in controlling or allocating each PDSCH depending on the content of the information element included in sDCI, but it is possible to control the reception performance of sDCI and the complexity of DCI blind decoding of the terminal may be reduced compared to case #1 (1500) or case #2 (1505).

[0375] Case #4 (1515) is an example of transmitting control information for PDSCHs transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in the same DCI (Long DCI) as the control information for PDSCHs transmitted from the serving TRP in a situation where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs in addition to the serving TRP (TRP#0) used for single PDSCH transmission. That is, the UE can obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. In case #4 (1515), the complexity of DCI blind decoding of the UE may not increase, but the degree of freedom in PDSCH control or allocation may be low, such as because the number of cooperative TRPs is limited due to the long DCI payload limitation.

[0376] In the following descriptions and examples, sDCI may refer to various auxiliary DCIs, such as shortened DCI, secondary DCI, or normal DCI (DCI format 1_0 to 1_1 described above) containing PDSCH control information transmitted in a cooperative TRP, and unless a special limitation is specified, the description can be similarly applied to the various auxiliary DCIs described above.

[0377] In the following description and examples, the aforementioned cases #1 (1500), #2 (1505), and #3 (1510), in which more than one DCI (PDCCH) is used to support NC-JT, may be classified as multiple PDCCH-based NC-JT, and the aforementioned case #4 (1515), in which a single DCI (PDCCH) is used to support NC-JT, may be classified as single PDCCH-based NC-JT. In PDSCH transmission based on multiple PDCCH, a CORESET in which the DCI of the serving TRP (TRP#0) is scheduled and a CORESET in which the DCI of the cooperating TRPs (TRP#1 to TRP#(N-1)) are scheduled may be distinguished. As a method for distinguishing the CORESETs, there may be a method for distinguishing through an upper layer indicator for each CORESET, a method for distinguishing through beam setting for each CORESET, etc. Additionally, in single PDCCH-based NC-JT, instead of a single DCI scheduling multiple PDSCHs, a single PDSCH with multiple layers is scheduled, and the multiple layers described above can be transmitted from multiple Transmission Relays (TRPs). In this case, the connection relationship between a layer and the TRP transmitting the layer can be indicated through a Transmission Configuration Indicator (TCI) indication for the layer.

[0378] In the embodiments of the present disclosure, “cooperative TRP” may be replaced with various terms such as “cooperative panel” or “cooperative beam” in actual application.

[0379] In the embodiments of the present disclosure, “when NC-JT is applied” can be interpreted in various ways depending on the situation, such as “when a terminal simultaneously receives one or more PDSCHs in one BWP,” “when a terminal simultaneously receives PDSCHs based on two or more TCI (Transmission Configuration Indicator) indications in one BWP,” or “when a PDSCH received by a terminal is associated with one or more DMRS port groups,” but is used as a single expression for convenience of explanation.

[0380] The wireless protocol architecture for NC-JT in the present disclosure can be used in various ways depending on the TRP deployment scenario. For example, when there is no or small backhaul delay between cooperative TRPs, a method using a structure based on MAC layer multiplexing (CA-like method) similar to S10 of FIG. 5 is possible. On the other hand, when the backhaul delay between cooperative TRPs is so large that it cannot be ignored (for example, when more than 2 ms is required for information exchange such as CSI, scheduling, and HARQ-ACK between cooperative TRPs), a method (DC-like method) is possible to secure delay-robust characteristics by using an independent structure for each TRP starting from the RLC layer, similar to S20 of FIG. 5.

[0381] A terminal supporting C-JT or / and NC-JT can receive C-JT or / and NC-JT related parameters or setting values ​​from a higher layer configuration, and set the RRC parameters of the terminal based on the parameters. For the higher layer configuration, the terminal can utilize a UE capability parameter, for example, tci-StatePDSCH. Here, the UE capability parameter, for example, tci-StatePDSCH, can define TCI states for the purpose of PDSCH transmission, and the number of TCI states can be set to 4, 8, 16, 32, 64, 128 in FR1, and to 64 and 128 in FR2, and among the set number, up to 8 states can be set that can be indicated by 3 bits of the TCI field of the DCI via a MAC CE message. The maximum value 128 means the value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in the capability signaling of the terminal. In this way, a series of configuration processes from upper layer configuration to MAC CE configuration can be applied to a beamforming instruction or beamforming change command for at least one PDSCH in one TRP.

[0382] [Multi-DCI based Multi-TRP]

[0383] As one embodiment of the present disclosure, a multi-DCI-based multi-TRP transmission method is described. The multi-DCI-based multi-TRP transmission method can establish a downlink control channel for NC-JT transmission based on a multi-PDCCH.

[0384] In NC-JT based on multiple PDCCHs, when transmitting DCI for the PDSCH schedule of each TRP, a CORESET or search space can be distinguished for each TRP. The CORESET or search space for each TRP can be configured as in at least one of the following cases.

[0385] * Setting of upper layer index for each CORESET: The CORESET setting information set as an upper layer may include an index value, and the TRP transmitting the PDCCH in the corresponding CORESET may be distinguished by the set index value for each CORESET. That is, in a set of CORESETs with the same upper layer index value, it may be considered that the same TRP transmits the PDCCH, or it may be considered that a PDCCH scheduling the PDSCH of the same TRP is transmitted. The above-described index for each CORESET may be named as CORESETPoolIndex, and for CORESETs with the same CORESETPoolIndex value set, it may be considered that the PDCCH is transmitted from the same TRP. For a CORESET for which the CORESETPoolIndex value is not set, it may be considered that the default value of CORESETPoolIndex is set, and the above-described default value may be 0.

[0386] ** In the present disclosure, if the number of types of CORESETPoolIndex of each of the multiple CORESETs included in the upper layer signaling PDCCH-Config exceeds 1, i.e., if each CORESET has a different CORESETPoolIndex, the terminal may consider that the base station can use the multi-DCI based multi-TRP transmission method.

[0387] ** Differently, in the present disclosure, if each of the multiple CORESETs included in the upper layer signaling PDCCH-Config has only one type of CORESETPoolIndex, that is, if all CORESETs have the same CORESETPoolIndex of 0 or 1, the terminal can assume that the base station transmits using a single-TRP rather than using a multi-DCI based multi-TRP transmission method.

[0388] * Multiple PDCCH-Config settings: Multiple PDCCH-Configs are configured within one BWP, and each PDCCH-Config can include PDCCH settings for each TRP. That is, a list of CORESETs for each TRP and / or a list of search spaces for each TRP can be configured in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config can be considered to correspond to a specific TRP.

[0389] * CORESET Beam / Beam Group Configuration: The TRP corresponding to the CORESET can be distinguished through the beam or beam group configured for each CORESET. For example, if the same TCI state is set for multiple CORESETs, the CORESETs can be considered to be transmitted through the same TRP, or the PDCCH that schedules the PDSCH of the same TRP can be considered to be transmitted in the CORESET.

[0390] * Search space beam / beam group configuration: A beam or beam group is configured for each search space, and this allows TRPs for each search space to be distinguished. For example, if the same beam / beam group or TCI state is set for multiple search spaces, it can be considered that the same TRP transmits a PDCCH in the corresponding search space, or that a PDCCH that schedules the PDSCH of the same TRP is transmitted in the corresponding search space.

[0391] By dividing the CORESET or search space by TRP as described above, PDSCH and HARQ-ACK information classification for each TRP is possible, and this enables independent HARQ-ACK codebook generation and independent PUCCH resource use for each TRP.

[0392] The above settings can be independent on a per-cell or per-BWP basis. For example, a PCell may have two different CORESETPoolIndex values, while a specific SCell may not have a CORESETPoolIndex value set. In this case, it can be assumed that NC-JT transmission is configured on the PCell, while NC-JT transmission is not configured on the SCell without the CORESETPoolIndex value set.

[0393] The PDSCH TCI state activation / deactivation MAC-CE applicable to the multi-DCI based multi-TRP transmission method may follow the above-described FIG. 13. If the UE does not have CORESETPoolIndex set for each of all CORESETs in the upper layer signaling PDCCH-Config, the UE may ignore the CORESET Pool ID field (1355) in the corresponding MAC-CE (1350). If the UE can support the multi-DCI based multi-TRP transmission method, i.e., if each CORESET in the upper layer signaling PDCCH-Config of the UE has a different CORESETPoolIndex, the UE may activate the TCI state in the DCI included in the PDCCH transmitted in the CORESETs having the same CORESETPoolIndex value as the CORESET Pool ID field (1355) value in the corresponding MAC-CE (1350). For example, if the value of the CORESET Pool ID field (1355) in the corresponding MAC-CE (1350) is 0, the TCI state in the DCI included in the PDCCH transmitted from CORESETs with CORESETPoolIndex of 0 may follow the activation information of the corresponding MAC-CE.

[0394] When a terminal is configured to use a multi-DCI based multi-TRP transmission method from a base station, that is, when each of multiple CORESETs included in the upper layer signaling PDCCH-Config has more than one type of CORESETPoolIndex or when each CORESET has a different CORESETPoolIndex, the terminal can know that the following restrictions exist for PDSCHs scheduled from PDCCHs within each CORESET having two different CORESETPoolIndexes.

[0395] 1) If the PDSCHs indicated by the PDCCHs within each CORESET having two different CORESETPoolIndexes completely or partially overlap, the TCI states indicated by each PDCCH can be applied to different CDM groups. That is, two or more TCI states may not be applied to a single CDM group.

[0396] 2) The terminal can expect that the actual number of front-loaded DMRS symbols, the actual number of additional DMRS symbols, the location of actual DMRS symbols, and the DMRS type of each PDSCH will not be different when the PDSCHs indicated from the PDCCHs within each CORESET having two different CORESETPoolIndexes overlap completely or partially.

[0397] 3) The terminal can expect that the bandwidth portion indicated by the PDCCH within each CORESET having two different CORESETPoolIndexes will be the same and that the subcarrier spacing will also be the same.

[0398] 4) The terminal can expect that each PDCCH will fully contain information about the PDSCH scheduled from the PDCCH within each CORESET having two different CORESETPoolIndexes.

[0399] [Single-DCI based Multi-TRP]

[0400] As one embodiment of the present disclosure, a single-DCI-based multi-TRP transmission method is described. The single-DCI-based multi-TRP transmission method can establish a downlink control channel for NC-JT transmission based on a single-PDCCH.

[0401] In a single DCI-based multi-TRP transmission method, a PDSCH transmitted by multiple TRPs can be scheduled with a single DCI. At this time, the number of TCI states can be used as a method of indicating the number of TRPs transmitting the corresponding PDSCH. That is, if the number of TCI states indicated in the DCI scheduling the PDSCH is two, it can be considered as a single PDCCH-based NC-JT transmission, and if the number of TCI states is one, it can be considered as a single-TRP transmission. The TCI states indicated in the above DCI can correspond to one or both of the TCI states activated by MAC-CE. When the TCI states of the DCI correspond to two TCI states activated by MAC-CE, a correspondence relationship is established between the TCI codepoint indicated in the DCI and the TCI states activated by MAC-CE, and this can be the case when there are two TCI states activated by MAC-CE corresponding to the above TCI codepoint.

[0402] As another example, if at least one codepoint among all codepoints in the TCI state field within the DCI indicates two TCI states, the UE may assume that the base station can transmit based on the single-DCI based multi-TRP method. In this case, at least one codepoint indicating two TCI states within the TCI state field may be activated via the Enhanced PDSCH TCI state activation / deactivation MAC-CE.

[0403] Figure 16 is a diagram illustrating the structure of the Enhanced PDSCH TCI state activation / deactivation MAC-CE. The meaning of each field within the MAC CE and the values ​​that can be set for each field are as shown in [Table 23] below.

[0404] [Table 23]

[0405]

[0406] In Fig. 16, if the value of the C0 field (1605) is 1, the corresponding MAC-CE is the TCI state ID 0,1 Additionally, TCI state ID in field (1610) 0,2 It may include field (1615). This is the TCI state ID for the 0th codepoint of the TCI state field included in the DCI. 0,1 and TCI state ID 0,2 This means that the MAC-CE is activated, and if the base station instructs the terminal with the corresponding codepoint, the terminal can be instructed with two TCI states. If the value of the C0 field (1605) is 0, the corresponding MAC-CE is the TCI state ID. 0,2 It cannot contain field (1615), which is the TCI state ID for the 0th codepoint of the TCI state field contained within the DCI. 0,1 This means that one TCI state corresponding to is activated.

[0407] The above configuration can be independent on a per-cell or per-BWP basis. For example, a PCell may have up to two activated TCI states corresponding to a single TCI codepoint, while a specific SCell may have up to one activated TCI state corresponding to a single TCI codepoint. In this case, it can be assumed that NC-JT transmission is configured on the PCell, while NC-JT transmission is not configured on the aforementioned SCell.

[0408] [Distinguishing between Single-DCI-based Multi-TRP PDSCH Repetitive Transmission Techniques (TDM / FDM / SDM)]

[0409] Next, a method for distinguishing single-DCI based multi-TRP PDSCH repetition transmission techniques is described. A terminal may be instructed to use different single-DCI based multi-TRP PDSCH repetition transmission techniques (e.g., time division multiplexing (TDM), frequency division multiplexing (FDM), spatial division multiplexing (SDM)) depending on the value indicated by the DCI field from the base station and the upper layer signaling configuration. [Table 24] below shows a method for distinguishing between single or multiple TRP based techniques indicated to a terminal depending on the value of a specific DCI field and the upper layer signaling configuration.

[0410] [Table 24]

[0411]

[0412] In the above [Table 24], each column can be explained as follows.

[0413] - Number of TCI states (2 columns): This refers to the number of TCI states indicated by the TCI state field in DCI, and can be 1 or 2.

[0414] - Number of CDM Groups (column 3): This indicates the number of different CDM groups of DMRS ports indicated by the Antenna port field in the DCI. It can be 1, 2, or 3.

[0415] - repetitionNumber setting and indication conditions (column 4): There are three conditions depending on whether repetitionNumber is set for all TDRA entries that can be indicated by the Time Domain Resource Allocation field in DCI and whether the actually indicated TDRA entry has repetitionNumber setting.

[0416] * Condition 1: At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field contains a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI contains a setting for repetitionNumber greater than 1.

[0417] * Condition 2: At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field contains a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI does not contain a setting for repetitionNumber.

[0418] * Condition 3: If all TDRA entries that can be indicated by the Time Domain Resource Allocation field do not contain a setting for repetitionNumber.

[0419] - RepetitionScheme setting related (column 5): This indicates whether the upper layer signaling repetitionScheme is set. The upper layer signaling repetitionScheme can be set to one of 'tdmSchemeA', 'fdmSchemeA', or 'fdmSchemeB'.

[0420] - Transmission technique indicated to the terminal (column 6): Refers to single or multiple TRP techniques indicated according to each combination (column 1) expressed in [Table 24] above.

[0421] * Single-TRP: This refers to a single TRP-based PDSCH transmission. If the UE has configured the pdsch-AggegationFactor in the upper layer signaling PDSCH-config, the UE can be scheduled for the configured number of repeated single-TRP-based PDSCH transmissions. Otherwise, the UE can be scheduled for a single single-TRP-based PDSCH transmission.

[0422] * Single-TRP TDM scheme B: This refers to PDSCH repeated transmission based on time resource division between single TRP slots. According to Condition 1 related to repetitionNumber described above, the UE repeatedly transmits PDSCH in the time dimension for the number of slots with repetitionNumber that is greater than 1 set in the TDRA entry indicated by the Time Domain Resource Allocation field. At this time, for each slot with repetitionNumber, the start symbol and symbol length of the PDSCH indicated by the TDRA entry are applied identically, and the same TCI state is applied for each PDSCH repeated transmission. This technique is similar to the slot aggregation method in that it performs PDSCH repeated transmission between slots on time resources, but it differs from slot aggregation in that it can dynamically determine whether to indicate repeated transmission based on the Time Domain Resource Allocation field in the DCI.

[0423] * Multi-TRP SDM: This refers to a PDSCH transmission method based on spatial resource division based on multiple TRPs. This is a method of receiving by dividing layers from each TRP. Although it is not a repetitive transmission method, it can increase the reliability of PDSCH transmission by increasing the number of layers and lowering the coding rate. The terminal can receive PDSCH by applying the two TCI states indicated through the TCI state field in the DCI for each of the two CDM groups indicated by the base station.

[0424] * Multi-TRP FDM scheme A: This refers to a multi-TRP based frequency resource division PDSCH transmission method. It has one PDSCH transmission position (occasion), so it is not repetitive transmission like multi-TRP SDM, but it is a technique that can transmit with high reliability by increasing the frequency resource amount and lowering the coding rate. Multi-TRP FDM scheme A can apply two TCI states indicated through the TCI state field in the DCI for non-overlapping frequency resources. If the PRB bundling size is determined as wideband, if the number of RBs indicated by the Frequency Domain Resource Allocation field is N, the terminal applies the first TCI state to the first ceil(N / 2) RBs and applies the second TCI state to the remaining floor(N / 2) RBs. Here, ceil(.) and floor(.) are operators that indicate rounding up and down to the first decimal place. If the PRB bundling size is determined as 2 or 4, even-numbered PRGs receive the first TCI state, and odd-numbered PRGs receive the second TCI state.

[0425] * Multi-TRP FDM scheme B: This refers to a multi-TRP based frequency resource division PDSCH repeated transmission method, and it has two PDSCH transmission positions (occasions) so that PDSCH can be repeatedly transmitted in each position. Multi-TRP FDM scheme B, like A, can apply two TCI states indicated through the TCI state field in the DCI to non-overlapping frequency resources. If the PRB bundling size is determined as wideband, if the number of RBs indicated by the Frequency Domain Resource Allocation field is N, the UE applies the first TCI state to the first ceil (N / 2) RBs and applies the second TCI state to the remaining floor (N / 2) RBs and receives them. Here, ceil (.) and floor (.) are operators indicating round up and down to the first decimal place. If the PRB bundling size is determined as 2 or 4, even-numbered PRGs receive the first TCI state, and odd-numbered PRGs receive the second TCI state.

[0426] * Multi-TRP TDM scheme A: This refers to a PDSCH repeated transmission method within a multi-TRP based time resource division slot. A terminal has two PDSCH transmission positions (occasions) within one slot, and the first reception position can be determined based on the starting symbol and symbol length of the PDSCH indicated through the Time Domain Resource Allocation field in the DCI. The starting symbol of the second reception position of the PDSCH can be a position that applies a symbol offset by the upper layer signaling StartingSymbolOffsetK from the last symbol of the first transmission position, and the transmission position can be determined by the indicated symbol length. If the upper layer signaling StartingSymbolOffsetK is not set, the symbol offset can be regarded as 0.

[0427] * Multi-TRP TDM scheme B: This refers to a PDSCH repeated transmission method between time resource division slots based on multiple TRPs. The UE has one PDSCH transmission position (occasion) in one slot, and can receive repeated transmissions based on the start symbol and symbol length of the same PDSCH for the number of slots indicated by the repetitionNumber through the Time Domain Resource Allocation field in the DCI. If the repetitionNumber is 2, the UE can receive the PDSCH repeated transmissions of the first and second slots by applying the first and second TCI states, respectively. If the repetitionNumber is greater than 2, the UE can use different TCI state application methods depending on how the upper layer signaling tciMapping is set. If tciMapping is set to cyclicMapping, the first and second TCI states are applied to the first and second PDSCH transmission positions, respectively, and the same TCI state application method is applied to the remaining PDSCH transmission positions. If tciMapping is set to sequentialMapping, the first TCI state is applied to the first and second PDSCH transmission positions, the second TCI state is applied to the third and fourth PDSCH transmission positions, and the same TCI state application method is applied to the remaining PDSCH transmission positions.

[0428] The present disclosure is described in more detail below based on the above-described content. The above-described content may be applied to the present disclosure described below. The operations / functions / terms, etc. described above may be applied to the present disclosure described below.

[0429] The multiple embodiments described in the present disclosure below are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0430] [MC-DCI (multi-cell DCI) scheduling]

[0431] DCI format 0_3 is used for scheduling a single PUSCH in a single cell or multiple PUSCHs in multiple cells. The following information is transmitted using DCI format 0_3 scrambled with C-RNTI or MCS-C-RNTI. The identifier for the DCI format consists of 1 bit, and the value of this bit field is always set to 0, indicating the UL DCI format.

[0432] The scheduled cell set indicator is a field that indicates the set of cells to be scheduled, and its number of bits is Here, N_set is the number of cell sets configured to be scheduled from a cell whose DCI format is 0_3 / 1_3 by the higher layer parameter MC-DCI-SetofCellsToAddModList, respectively, and whose format is carried on the PDCCH. If this field is present, it can be used to indicate a reserved cell set according to Table 25. Otherwise, the scheduled cell set means a cell set configured to be scheduled from a cell with DCI format 0_3 / 1_3 by the higher layer parameter MC-DCI-SetofCellsToAddModList.

[0433] The Scheduled cells indicator is a field that indicates the cells to be scheduled, and its number of bits can be determined by the following. For example, it can be 0 bits if the upper layer parameter ScheduledCellCombo-ListDCI-0-3 for the reserved cell set is not configured. For another example, otherwise The reserved cells within the set of bit-reserved cells are represented according to Table 26, where is the number of items in the upper layer parameter ScheduledCellCombo-ListDCI-0-3. If only one item is configured in the upper layer parameter ScheduledCellCombo-ListDCI-0-3, the reserved cell may mean the cell set by the upper layer parameter ScheduledCellCombo-ListDCI-0-3.

[0434] Frequency domain resource assignment - determines the number of bits in the following case, if it is the size of the active UL bandwidth portion (block number 1, block number 2, ..., block number )

[0435] If ScheduledCellCombo-ListDCI-0-3 for a scheduled cell set consists of two or more entries, is the number of reserved cells indicated by the Reserved Cells Display field. If the ScheduledCellCombo-ListDCI-0-3 for the reserved cell set consists of only one item, is the number of cells configured by the upper layer parameter ScheduledCellCombo-ListDCI-0-3. Otherwise, is the number of cells configured by the upper layer parameter ScheduledCell-ListDCI-0-3 in the reserved cell set. Each block corresponds to a frequency domain resource allocation for a cell, and the blocks are arranged in ascending order of serving cell index, where block number 1 may correspond to a frequency domain resource allocation for the cell with the smallest serving cell index. Each block is defined by the following fields.

[0436] If the upper layer parameter useInterlacePUCCH-PUSCH is not set in BWP-UplinkDedicated and only resource allocation type 0 is configured, Bits are used. Also, if only resource allocation type 1 is configured, bits based on a specific value are used, and if set to 'dynamic switch', the maximum value is used. If set to 'dynamic switch', the MSB bit is used to indicate the resource allocation type. For resource allocation type 0, The LSB provides resource allocation, and for resource allocation type 1, the LSB with a specific value provides resource allocation. For PUSCH hopping, the frequency offset is additionally considered.

[0437] Time domain resource allocation - Beat, here is the number of entries in the upper layer parameter TDRA-FieldIndexListDCI-0-3. This field is used to indicate entries in the upper layer parameter TDRA-FieldIndexListDCI-0-3 according to Table 27. Each entry in the upper layer parameter TDRA-FieldIndexListDCI-0-3 contains a 'time domain resource allocation' index for each BWP of each cell in the reserved cell set, where the 'time domain resource allocation' indices for all cells are arranged in ascending order of the serving cell index, and the 'time domain resource allocation' indices for all BWPs of the cell are arranged in ascending order of the upper layer parameter BWP-Id.

[0438] [Table 25]

[0439]

[0440] [Table 26]

[0441]

[0442] [Table 27]

[0443]

[0444] Parameters for a set of serving cells for multi-cell PDSCH / PUSCH scheduling can be configured from the base station to the terminal via higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure parameters for a set of serving cells for multi-cell PDSCH / PUSCH scheduling to the terminal in the serving cell configuration (ServingCellConfig). For example, the information in Table 28-1 below can be included.

[0445] [Table 28-1]

[0446]

[0447] For a description of each parameter in Table 28-1, see Table 28-2 below.

[0448] [Table 28-2]

[0449]

[0450]

[0451] In Rel-18, limited operations were proposed to improve multi-carrier scheduling. These include different SCSs between co-reserved cells, different carrier types between co-reserved cells, and more than one scheduling cell for a reserved cell. For a scheduled cell, PDCCH can be offloaded from a single scheduling cell by supporting one scheduling cell for multi-cell scheduling and another scheduling cell for single-cell scheduling. In addition, new DCI formats, DCI formats 0_3 and 1_3, were introduced. Each DCI format 0_3 or 1_3 can reserve up to four cells, with a limitation of a single PUSCH or PDSCH per reserved cell. For frequency range 2 (FR2) with high SCS, reservations for up to eight PUSCHs or PDSCHs for a single serving cell were introduced by a single DCI format 0_1 ​​or 1_1 to save UE power consumption and reduce PDCCH monitoring.

[0452] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Although embodiments of the present disclosure are described below using a 5G system as an example, embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Therefore, embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art.

[0453] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0454] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0455] - MIB (Master Information Block)

[0456] - SIB (System Information Block) or SIB

[0457] - RRC (Radio Resource Control)

[0458] - MAC (Medium Access Control) CE (Control Element)

[0459] In addition, L1 (layer 1) signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the following physical layer channels or signaling.

[0460] - PDCCH (Physical Downlink Control Channel)

[0461] - DCI (Downlink Control Information)

[0462] - UE-specific DCI

[0463] - Group common DCI

[0464] - Common DCI

[0465] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0466] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0467] - PUCCH (Physical Uplink Control Channel)

[0468] - UCI (Uplink Control Information)

[0469] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0470] In various embodiments of the present disclosure, we propose a method of scheduling multiple cells at once using one or more PUSCH / PDSCHs per cell with one DCI format 0_3 or 1_3 reserved, by combining multi-cell scheduling with single-DCI / multi-DCI (S-DCI / M-DCI) based multi-TRP (M-TRP) scheduling to maximize the benefits of power savings and PDCCH overhead reduction.

[0471] In the present disclosure, a single TRP or multiple TRPs may be considered, and in the single or multiple TRPs, a cell that schedules at least one data resource in at least one PDCCH resource by a specific DCI (MC-DCI) format such as DCI format 0_3 or 1_3 (e.g., a multi-carrier / cell scheduling cell), a scheduled cell (e.g., a scheduled cell), and a cell that is neither scheduled nor scheduled (No scheduling / scheduled cell) may be distinguished. Three embodiments according to the present disclosure will be described based on combinations of these three cells and single / multiple TRPs.

[0472] The following three embodiments are not independent and may be applied / used in combination. For example, the applicable / used embodiment may be identified depending on whether S-TRP and M-TRP are used / configured and / or whether S-DCI and M-DCI are used / configured.

[0473] For example, S-TRP and M-TRP can be identified based on CORESETPoolindex, and for more specific details, refer to the description of an embodiment of the present disclosure described above.

[0474] For example, the terminal can monitor / blind decode the PDCCH and distinguish whether the DCI received on the PDCCH is S-DCI or M-DCI depending on the scheduling method of the PDSCH or PUSCH. Information about the cell or set of cells where the MC-DCI is scheduled is preset by upper layer signaling, and the terminal can perform monitoring / blind decoding on the PDCCH in the configured cell. Alternatively, if a SearchSpaceLinkingId linking two search spaces of the same type in the same BWP is set, it can be assumed that the search spaces with the same SearchSpaceLinkingId are linked to the PDCCH repetition reference. In this case, it can be identified that M-DCI is used. Support for M-DCI can be reported as a terminal capability.

[0475] In the case where MC-DCI is identified as being transmitted and received by S-TRP-based Multi-cell scheduling according to the above example, the first embodiment can be applied, in the case where MC-DCI is identified as being transmitted and received by S-DCI-based M-TRP Multi-cell scheduling, the second embodiment can be applied, and in the case where MC-DCI is identified as being transmitted and received by M-DCI-based M-TRP Multi-cell scheduling, the third embodiment can be applied.

[0476] Although the present disclosure has been described below using the example of a case where a PDSCH is scheduled (DCI format 1_3), the present disclosure is also applicable to a case where a PSUCH is scheduled (DCI format 0_3). That is, in the present disclosure below, a PDSCH can be replaced with a PUSCH.

[0477] <Example 1: S-TRP-based multi-cell scheduling scenario for transmitting MC-DCI>

[0478] As one embodiment of the present disclosure, a scheduling method using MC-DCI (Multi-cell scheduling DCI) is described. This embodiment can be operated in combination with other embodiments.

[0479] FIG. 19 is a diagram illustrating a single TRP-based multi-cell scheduling operation for transmitting multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0480] In Fig. 19, it is assumed that the base station and the terminal are configured so that the CORESET or PDCCH resource including MC-DCI is transmitted only in one TRP. That is, Fig. 19 shows an example in which MC-DCI is transmitted and received through one TRP.

[0481] First, the base station and / or the terminal can determine whether scheduling for at least one cell of a single TRP is supported through a PDCCH containing MC-DCI in the cell, if the single TRP cell is a scheduling cell.

[0482] For example, MC-DCI transmitted by a single TRP cell can be defined / configured to simultaneously schedule the serving cell and multiple other cell(s) by the same TRP (one TRP, TRP corresponding to a single TRP cell). That is, MC-DCI transmitted from a single TRP cell can simultaneously schedule one or more cells of the single TRP corresponding to the single TRP cell. This can be understood as the same scenario as the multi-cell scheduling operation supported by rel-18.

[0483] Second, the base station and / or the terminal can determine whether scheduling for at least the serving cell, the single TRP cell, and / or cells operating with multiple TRPs based on the single DCI is supported through a PDCCH including MC-DCI in the cell, if the single TRP cell is a scheduling cell.

[0484] For example, MC-DCI transmitted by a single TRP cell can be defined / configured to simultaneously schedule at least one cell by the same TRP (one TRP, TRP corresponding to a single TRP cell), and / or multiple TRP cell(s) based on a single DCI.

[0485] Specifically, referring to 1900 of FIG. 19, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the first cell (cell#1), which is a scheduling cell, may indicate a first PDSCH resource scheduled to the first cell (cell#1) corresponding to a single TRP cell, a second PDSCH resource scheduled to the second cell (cell#2), and a third PDSCH resource (PDSCH#3) transmitted by the first TRP (TRP A) and scheduled to the third cell (Cell#3), and a third PDSCH resource transmitted by the second TRP (TRP B) and scheduled to the third cell (Cell#3), which correspond to multiple TRP cells based on a single DCI.

[0486] For the first to third PDSCH resource allocation, the base station may include a block number and / or resource allocation area related information in the DCI within the FDRA (Frequency Domain Resource Assignment) field. Here, the block corresponds to the frequency domain resource assignment for the cell, and the block numbers are arranged in ascending order of the Serving Cell Index, and the block corresponding to the Frequency Domain Resource Assignment for the cell with the smallest Serving Cell Index has Block Number 1. In particular, the PDSCH resource scheduling method received in the first TRP and / or the second TRP, such as the third PDSCH, may be set based on at least one of the Multi-TRP FDM scheme A and the Multi-TRP FDM scheme B described above.

[0487] The base station may include TDRA (Time domain resource assignment) and / or resource allocation area related information in the DCI for the first to third PDSCH resource allocation. Here, the TDRA field It's a beat, and here is the number of entries in the upper layer parameter TDRA-FieldIndexListDCI-1-3. Each entry of the upper layer parameter TDRA-FieldIndexListDCI-1-3 may include a Time domain resource assignment index for each BWP of each cell included in the scheduled cell set. Here, the Time domain resource assignment indices for all cells may be arranged in the ascending order of the serving cell, and the 'Time domain resource assignment' indices for all BWPs of the cell may be arranged in the ascending order of the upper layer parameter BWP-Id. The above description is an example of a case where DCI format 1_3 is used as the DCI. If DCI format 0_3 is used as the DCI, TDRA-FieldIndexListDCI-1-3 in the above description may be replaced with TDRA-FieldIndexListDCI-0-3. In the above description, all cells are cells that are scheduled with MC-DCI (DCI format 0_3 / 1_3) and are set through upper layer signaling, and for example, in the example of 1900 in FIG. 19, they can be cell#1, cell#2, and cell#3.

[0488] The base station can instruct the terminal through DCI beamforming-related information for transmission of the first to third PDSCHs.

[0489] In one embodiment, the beamforming related information may include a TCI field and / or a TCI selection field, and based on this field, the base station and the terminal may indicate / confirm whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP. Specifically, the TCI field may include the following information. For example, the TCI field and / or the TCI selection field are set to 0 bits if tci-PresentInDCI is not activated in RRC, and otherwise can be set to bits. Here is the number of entries in the upper layer parameter tci-ListDCI-1-3. This field is used to indicate the entries in the upper layer parameter tci-ListDCI-1-3 according to Table 29.

[0490] [Table 29]

[0491]

[0492] Each entry of the upper layer parameter tci-ListDCI-1-3 contains a "Transmission Configuration Indication" Index for each Cell in the Scheduled Cell Set, and the "Transmission Configuration Indication" Indices for all Cells are arranged in ascending order of the Serving Cell Index. Each "TCI" index is 3 bits. If the BWP indicator field indicates a bandwidth part other than the Active bandwidth part, and if the upper layer parameter tci-PresentInDCI is not enabled for a CORESET used in a PDCCH containing DCI format 1_3, the UE may assume that tci-PresentInDCI is not enabled for all CORESETs of the indicated bandwidth part. Otherwise, the UE may assume that tci-PresentInDCI is enabled for all CORESETs of the indicated bandwidth part. Here, the terminal can determine whether the codepoint value of the TCI field indicates multiple TCI states for unified TCI states or a single TCI state based on the previously received and confirmed MAC CE. Finally, the terminal can determine whether to schedule only PDSCHs of the same TRP in a specific cell or to schedule multiple PDSCHs of two or more TRPs by checking the information indicated by the codepoint of the received TCI field. The above description is an example of a case where DCI format 1_3 is used as DCI, and if DCI format 0_3 is used as DCI, tci-ListDCI-1-3 in the above description can be replaced with tci-ListDCI-0-3.In the above description, all cells are cells that are scheduled with MC-DCI (DCI format 0_3 / 1_3) and are set through upper layer signaling, and for example, in the example of 1900 in FIG. 19, they can be cell#1, cell#2, and cell#3.

[0493] Additionally, the TCI selection field can be set to 0 bit if the upper RRC layer parameter, tciSelection-PresentInDCI, is not set, otherwise 2 bits according to Table 30 can be set.

[0494] [Table 30]

[0495]

[0496] The base station may instruct the terminal through DCI information related to a set of co-scheduled cell(s) for transmission of the first to third PDSCHs.

[0497] In one embodiment, the information related to the set of co-scheduled cells(s) may be a Scheduled cell set indicator value that the base station indicates to the terminal. The terminal may determine whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP based on the Scheduled cell set indicator. The interpretation of the Scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, if it is identified that MC-DCI is transmitted and received by S-TRP-based multi-cell scheduling, the interpretation of the scheduled cell set indicator may be as follows.

[0498] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but as in the example of 1900 of FIG. 19, for cells that support PDSCH transmission by Single TRP, such as the first cell and the second cell, the value of the Scheduled cell set indicator is indicated as 0 (or 1), and for cells that indicate PDSCH transmission by S-DCI-based M-TRP, such as the third cell, the value of the Scheduled cell set indicator is indicated as 1 (or 0), so that the base station and the terminal can implicitly indicate / confirm the first PDSCH and second PDSCH transmission by Single TRP in the first cell and the second cell, and indicate / confirm the PDSCH transmission by S-DCI-based M-TRP in the third cell based on the Scheduled cell set indicator field information. When the value of the scheduled cell set indicator is 0 (or 1), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP, and when the value of the scheduled cell set indicator is 1 (or 0), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP. In addition, a terminal that has confirmed the scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by the S-DCI-based M-TRP in the third cell is transmitted in the second TRP or in the first TRP and the second TRP by combining at least one method among the other embodiments described above. This example is an example in which the scheduled cell set indicator is set to 1 bit.

[0499] In another embodiment, the information related to the set of co-scheduled cells(s) may be a scheduled cell set indicator value that the base station indicates to the terminal. The terminal can determine whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP based on the scheduled cell set indicator. The interpretation of the scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, if it is identified that MC-DCI is transmitted and received by S-TRP-based multi-cell scheduling, the interpretation of the scheduled cell set indicator may be as follows.

[0500] Specifically, the scheduled cell set indicator is an indicator indicating a set of scheduled cells, but as in the example of 1900 in FIG. 19, for cells that support PDSCH transmission by Single TRP, such as the first cell and the second cell, the value of the scheduled cell set indicator is indicated as 00 (or 10), and for cells that indicate PDSCH transmission by S-DCI-based M-TRP, such as the third cell, the value of the scheduled cell set indicator is indicated as 10 (or 00), so that the base station and the terminal can explicitly indicate / confirm the first PDSCH and second PDSCH transmission by Single TRP in the first cell and the second cell based on the most significant bit (MSB) that appears first among the two bits of the Scheduled cell set indicator field, and can indicate / confirm the PDSCH transmission by S-DCI-based M-TRP in the third cell. In this case, the MSB (most significant bit) of the scheduled cell set indicator 2 bits indicates whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP, and the LSB (least significant bit) of the scheduled cell set indicator can indicate the scheduled cell set.

[0501] The base station can indicate to the terminal that the first value (most significant bit, MSB) among the two bits of the scheduled cell set indicator field is 0 (or 1), and the terminal can confirm from the first value that the cell(s) of the last value (least significant bit, LSB) among the two bits indicating the actual scheduled cell set indicator value performs PDSCH transmission by Single TRP. The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 1 (or 0), and the terminal can confirm from the first value that the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value performs PDSCH transmission by S-DCI based M-TRP. In addition, the terminal that has confirmed the scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by the S-DCI-based M-TRP in the third cell is transmitted in the first TRP, in the second TRP, and / or in the first TRP and the second TRP by combining at least one of the methods of the other embodiments described above. This example is an example in which the scheduled cell set indicator is set to 2 bits. According to one embodiment of the present disclosure, the scheduled cell set indicator may be 1 bit or 2 bits, and any one of the embodiments described above may be applied depending on the number of bits of the scheduled cell set indicator.

[0502] In the previously described 2-bit scheduled cell set indicator related embodiment, a method of increasing the bitwidth within a single scheduled cell set indicator field, that is, a bit indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP and a bit indicating the scheduled cell set are considered to be distinguished within the scheduled cell set indicator field. However, a separate independent field indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP may be included in the DCI.

[0503] The base station may instruct the terminal through DCI the antenna port-related information of the first PDSCH, the second PDSCH, and / or the third PDSCH for transmission of co-scheduled PDSCH(s) (e.g., the first PDSCH to the third PDSCH).

[0504] In one embodiment, when AntennaPortsDCI-1-3=type1a is set from the upper layer signaling, the number of bits in the field representing the antenna port is can be determined by bits. This is set independently for each scheduled cell(s), where The value can be determined as the number of cells by the scheduled cell set parameter ScheduledCell-ListDCI-1-3 during RRC setup. Here, r corresponds to a value of 1 from the cell with the smallest serving cell index, and can be sequentially mapped in ascending order of serving cell index.

[0505] In another embodiment, if AntennaPortsDCI-1-3=type2 is set from the upper layer signaling, the number of bits of the antenna port is block number 1, block number 2, …, block number As such, each block can correspond to antenna port information for a scheduled cell. Here, the blocks correspond to each serving cell in ascending order of the serving cell index, and each block corresponds to antenna port information for the scheduled cell. Each block is arranged in ascending order of the corresponding Serving Cell Index, and the block number corresponding to the antenna port information for the cell with the smallest Serving Cell Index is 1.

[0506] If AntennaPortsDCI-1-3=type1a Or in case of AntennaPortsDCI-1-3= type2, each block is 4, 5 or 6 bits and indicates an index of a row of a predefined antenna port table according to the DM-RS type and maxlength value. Each row of the antenna port table contains the number of CDM groups without data (Number of DMRS CDM group(s) without data), the number of DMRS ports (DMRS port(s)) and / or the number of front-load symbols (Number of front-load symbols), and thus, the antenna port table contains the relationship between the number of CDM groups without data, the number of DMRS ports and / or the number of front-load symbols. Here, the values ​​of the number of CDM groups without data being 1, 2 and 3 mean CDM groups {0}, {0,1} and {0, 1, 2}, respectively.

[0507] The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, AntennaPortsDCI-1-3 in the above description can be replaced with AntennaPortsDCI-0-3 and ScheduledCell-ListDCI-1-3 can be replaced with ScheduledCell-ListDCI-0-3.

[0508] Meanwhile, in case of cell #4 operating as multi-DCI based multi-TRP, since the PDSCH transmitted in the first TRP and the second TRP can be separately scheduled in each PDCCH transmitted in the first TRP and the second TRP, the base station may not perform PDSCH scheduling for data transmission of TRP B directly in TRP A transmitting MC-DCI. In this way, if the base station configures a specific cell to operate as multi-DCI based multi-TRP in the RRC configuration, the terminal may determine that it is not included in the scheduled cell indicated by the codepoint of the Scheduled cell set indicator and / or Scheduled cells indicator field.

[0509] Third, the base station and / or the terminal can determine, if a single TRP cell is a scheduling cell, whether scheduling to at least a serving cell, a single TRP cell, and / or a cell operating as multiple TRPs based on multi-DCI is supported through a PDCCH including MC-DCI in that cell.

[0510] For example, MC-DCI transmitted by a single TRP cell can be scheduled simultaneously with at least one cell by the same TRP, and / or multiple TRP cell(s) based on multi-DCI.

[0511] Specifically, as in 1950 of FIG. 19, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the first cell (cell#1) can schedule the first PDSCH resource scheduled to the first cell (cell#1), the second PDSCH resource scheduled to the second cell (cell#2), and the fourth PDSCH resource (PDSCH#4) (PDSCH transmitted from the first TRP (TRP A)) scheduled to the fourth cell (Cell#4) corresponding to multiple TRP cells based on multi-DCI. The DCI transmitted by the second TRP (TRP B) through the PDCCH of the fourth cell (Cell#4) can indicate the fourth PDSCH resource scheduled to the fourth cell (Cell#4). Alternatively, the DCI transmitted by the first TRP (TRP A) via the PDCCH of the third cell (cell#3) may indicate a third PDSCH resource scheduled for the third cell (cell#3), wherein the third PDSCH resource may be transmitted from the first TRP (TRP A) and the second TRP (TRP B). That is, the PDSCH scheduled for the third cell (cell#3) may correspond to a single DCI-based multi-TRP.

[0512] The base station may include a block number and / or resource allocation area related information in the FDRA field in the DCI for the first to fourth PDSCH resource allocations excluding the third PDSCH. Here, a block corresponds to a frequency domain resource allocation for a Cell, and the block numbers are arranged in ascending order of the Serving Cell Index, and the block corresponding to the frequency domain resource allocation for the Cell with the smallest Serving Cell Index has Block Number 1. In particular, a PDSCH resource scheduling method received in the first TRP and / or the second TRP, such as the fourth PDSCH, may be set based on at least one of the Multi-TRP FDM scheme A and the Multi-TRP FDM scheme B described above. In the above description, the Serving Cell Index is an index of a cell set through upper layer signaling as a cell in which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of 1950 of FIG. 19, it can be cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2, cell#4 depending on whether cell#3 is set through the corresponding upper layer signaling.

[0513] The base station may include TDRA and / or resource allocation area related information in the DCI for resource allocation of the first to fourth PDSCHs, excluding the third PDSCH. Here, the TDRA field bits, where I_TDRA is the number of entries in the upper layer parameter TDRA-FieldIndexListDCI-1-3. Each entry of the upper layer parameter TDRA-FieldIndexListDCI-1-3 may contain a Time domain resource assignment index for a BWP of each cell in the scheduled cell set. Here, the Time domain resource assignment indices for all cells may be arranged in the ascending order of the serving cell, and the 'Time domain resource assignment' indices for all BWPs of the cell may be arranged in the ascending order of the upper layer parameter BWP-Id. The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, TDRA-FieldIndexListDCI-1-3 in the above description may be replaced with TDRA-FieldIndexListDCI-0-3. In the above description, all cells are cells configured through upper layer signaling as cells in which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of 1950 in FIG. 19, cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2, cell#4 can be configured depending on whether cell#3 is configured through the corresponding upper layer signaling.

[0514] The base station can instruct the terminal through DCI beamforming-related information for transmission of the first to fourth PDSCHs, excluding the third PDSCH.

[0515] In one embodiment, the beamforming related information may include a TCI field and / or a TCI selection field, and based on this field, the base station and the terminal may perform one of the operations of PDSCH transmission by Single TRP and PDSCH transmission by M-DCI-based M-TRP. Specifically, the TCI field may include the following information. For example, the TCI field and / or the TCI selection field are set to 0 bits if tci-PresentInDCI is not activated in RRC, and otherwise can be set to bits. Here is the number of entries in the upper layer parameter tci-ListDCI-1-3. This field is used to indicate the entries in the upper layer parameter tci-ListDCI-1-3 according to Table 29.

[0516] Each entry of the upper layer parameter tci-ListDCI-1-3 contains a “Transmission Configuration Indication” Index for each Cell in the Scheduled Cell Set, and the “Transmission Configuration Indication” Indices for all Cells are arranged in ascending order of the Serving Cell Index. Each “Transmission Configuration Indication” index is 3 bits. If the BWP indicator field indicates a bandwidth part other than the Active bandwidth part, and if the upper layer parameter tci-PresentInDCI is not enabled for a CORESET used in a PDCCH containing DCI format 1_3, the UE may assume that tci-PresentInDCI is not enabled for all CORESETs of the indicated bandwidth part. Otherwise, the UE may assume that tci-PresentInDCI is enabled for all CORESETs of the indicated bandwidth part. Here, the terminal can determine based on the previously received and confirmed MAC CE whether the codepoint value of the TCI field indicates multiple TCI states for unified TCI states or a single TCI state. This can be interpreted as TCI information for receiving PDSCH(s) transmitted by the terminal in the first TRP. The above description is an example of a case where DCI format 1_3 is used as DCI, and if DCI format 0_3 is used as DCI, tci-ListDCI-1-3 in the above description can be replaced with tci-ListDCI-0-3. In the above description, all cells are cells configured through upper layer signaling as cells where MC-DCI (DCI format 0_3 / 1_3) is scheduled.For example, in the example of 1950 of FIG. 19, it can be cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2, cell#4 depending on whether cell#3 is set through the corresponding upper layer signaling.

[0517] Additionally, the TCI selection field can be set to 0 bit if the upper RRC layer parameter, tciSelection-PresentInDCI, is not set, otherwise 2 bits according to Table 30 can be set.

[0518] The base station may instruct the terminal through DCI information related to a set of co-scheduled cell(s) for transmission of the first to fourth PDSCHs, excluding the third PDSCH.

[0519] In one embodiment, the information related to the set of co-scheduled cell(s) may be a Scheduled cell set indicator value that the base station indicates to the terminal. The terminal can determine whether the PDSCH transmission is by a single TRP or by an M-DCI-based M-TRP based on the Scheduled cell set indicator. The interpretation of the Scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. That is, when it is identified that MC-DCI is transmitted and received by S-TRP-based multi-cell scheduling, the interpretation of the scheduled cell set indicator may be as follows.

[0520] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but as in the example of 1950 of FIG. 19, for cells that support PDSCH transmission by Single TRP, such as the first cell and the second cell, the value of the Scheduled cell set indicator is indicated as 0 (or 1), and for cells that indicate PDSCH transmission by M-DCI-based M-TRP, such as the fourth cell, the value of the Scheduled cell set indicator is indicated as 1 (or 0), so that the base station and the terminal can implicitly indicate / confirm the first PDSCH and second PDSCH transmission by Single TRP in the first cell and the second cell, and indicate / confirm the PDSCH transmission by M-DCI-based M-TRP in the fourth cell based on the Scheduled cell set indicator field information. If the value of the scheduled cell set indicator is 0 (or 1), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP, and if the value of the scheduled cell set indicator is 1 (or 0), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP. In addition, a terminal that has confirmed the scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by the M-DCI-based M-TRP in the fourth cell is transmitted in the first TRP or in the first TRP and the second TRP by combining at least one of the methods among the other embodiments described above. This example is an example in which the scheduled cell set indicator is set to 1 bit.

[0521] In another embodiment, the information related to the set of co-scheduled cells may be a scheduled cell set indicator value that the base station indicates to the terminal. The terminal can determine whether the PDSCH transmission is by a single TRP or by an M-DCI-based M-TRP based on the scheduled cell set indicator.

[0522] Specifically, the scheduled cell set indicator is an indicator indicating a set of scheduled cells, but as in the example of 1950 of FIG. 19, for cells that support PDSCH transmission by Single TRP, such as the first cell and the second cell, the value of the scheduled cell set indicator is indicated as 00 (or 10), and for cells that indicate PDSCH transmission by M-DCI-based M-TRP, such as the fourth cell, the value of the scheduled cell set indicator is indicated as 10 (or 00), so that the base station and the terminal can explicitly indicate / confirm the first PDSCH and second PDSCH transmission by Single TRP in the first cell and the second cell based on the first value that appears first among the two bits of the Scheduled cell set indicator field, and can indicate / confirm the PDSCH transmission by M-DCI-based M-TRP in the fourth cell. In this case, the MSB of the 2-bit scheduled cell set indicator indicates whether the cell supports PDSCH transmission by single TRP or PDSCH transmission by multi TRP, and the LSB of the scheduled cell set indicator can indicate the scheduled cell set. This example is an example in which the scheduled cell set indicator is set to 2 bits. According to one embodiment of the present disclosure, the scheduled cell set indicator can be 1 bit or 2 bits, and any one of the above-described embodiments can be applied depending on the number of bits of the scheduled cell set indicator.

[0523] The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 0 (or 1), and the terminal can confirm from the first value that the PDSCH transmission by Single TRP is performed in the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value. The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 1 (or 0), and the terminal can confirm from the first value that the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value is performed the PDSCH transmission by M-DCI based M-TRP. In addition, a terminal that has confirmed the Scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by M-DCI-based M-TRP in the fourth cell is transmitted in the first TRP, or in the first TRP and the second TRP, by combining at least one of the methods among the other embodiments described above.

[0524] In the previously described 2-bit scheduled cell set indicator related embodiment, a method of increasing the bitwidth within a single scheduled cell set indicator field, that is, a bit indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP and a bit indicating the scheduled cell set are considered to be distinguished within the scheduled cell set indicator field. However, a separate independent field indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP may be included in the DCI.

[0525] In another embodiment, the information related to the set of co-scheduled cells here may be a scheduled cell set indicator value that the base station indicates to the terminal. The terminal can determine whether the PDSCH transmission is by a single TRP or by an M-DCI-based M-TRP by checking other information in the MC-DCI other than the scheduled cell set indicator. For example, a field indicating whether the PDSCH transmission is by a single TRP or by an M-DCI-based M-TRP may be included in the DCI.

[0526] The base station can instruct the terminal about co-scheduled PDSCH(s) antenna port related information through DCI. In the above description, the co-scheduled PDSCH(s) correspond to a cell configured through upper layer signaling as a cell in which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of 1950 of FIG. 19, the first PDSCH, the second PDSCH, the third PDSCH, the fourth PDSCH, or the first PDSCH, the second PDSCH, and the fourth PDSCH can be configured depending on whether cell#3 is configured through the corresponding upper layer signaling.

[0527] In one embodiment, when AntennaPortsDCI-1-3=type1a is set from the upper layer signaling, the number of bits in the field representing the antenna port is can be determined by bits. This is set independently for each scheduled cell(s), where The value can be determined as the number of cells by the scheduled cell set parameter ScheduledCell-ListDCI-1-3 during RRC setup. Here, r corresponds to a value of 1 from the cell with the smallest serving cell index, and can be sequentially mapped in ascending order of serving cell index.

[0528] In another embodiment, if AntennaPortsDCI-1-3=type2 is set from the upper layer signaling, the number of bits of the antenna port is block number 1, block number 2, …, block number As such, each block can correspond to antenna port information for a scheduled cell. Here, the blocks correspond to each serving cell in ascending order of the serving cell index, and each block corresponds to antenna port information for the scheduled cell. Each block is arranged in ascending order of the corresponding Serving Cell Index, and the block number corresponding to the antenna port information for the cell with the smallest Serving Cell Index is 1.

[0529] If AntennaPortsDCI-1-3=type1a Or for AntennaPortsDCI-1-3= type2, each block is 4, 5 or 6 bits and points to an index of a row of a predefined antenna port table according to the DM-RS type and maxlength value. Each row of the antenna port table contains the Number of DMRS CDM group(s) without data, the Number of DMRS ports and / or the Number of front-load symbols, and thus the antenna port table contains the relationship between the Number of CDM groups without data, the Number of DMRS ports and / or the Number of front-load symbols. Here, the values ​​of the Number of CDM groups without data being 1, 2 and 3 mean CDM groups {0}, {0,1} and {0, 1, 2}, respectively. Here, the MC-DCI may include only antenna port information for the PDSCH scheduled by the first TRP, and / or may include antenna port information for the PDSCH scheduled by the first TRP and additionally include antenna port information scheduled by the second TRP.

[0530] The base station can instruct the terminal to transmit co-scheduled PDSCH(s) via DCI, information corresponding to CORESETPoolindex. The information corresponding to CORESETPoolindex can include 1 bit corresponding to each scheduled cell. In the above description, the co-scheduled PDSCH(s) correspond to a cell configured through upper layer signaling as a cell in which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of 1950 of FIG. 19, the first PDSCH, the second PDSCH, the third PDSCH, the fourth PDSCH, or the first PDSCH, the second PDSCH, and the fourth PDSCH can be configured depending on whether cell#3 is configured through the corresponding upper layer signaling.

[0531] In one embodiment, the information corresponding to CORESETPoolindex here may indicate 0 (or 1) if the PDSCH is scheduled in the same TRP as the TRP in which the DCI is transmitted, and may indicate 1 (or 0) if the PDSCH is scheduled in a different TRP (cross TRP) from the TRP in which the DCI is transmitted.

[0532] In another embodiment, the information corresponding to CORESETPoolindex here may indicate 0 (or 1) for a cell that uses the same TRP scheduling scheme as the serving cell to which the DCI is transmitted, and may indicate 1 (or 0) for a cell that uses a different TRP scheduling scheme. For example, if the first cell, which is the serving cell, is a single TRP transmission, the information corresponding to CORESETPoolindex may indicate 0 (or 1) if the second cell uses a single TRP transmission, and if the second cell uses S-DCI based M-TRP transmission, the information corresponding to CORESETPoolindex may indicate 1 (or 0).

[0533] Meanwhile, in case of cell#3 operating with single-DCI based multi-TRP, since the base station can separately schedule the third PDSCH corresponding to the first TRP and the second TRP, respectively, through the PDCCH transmitted by the first TRP, the base station may not perform PDSCH scheduling for data transmission of the second TRP (e.g., TRP B) directly in the first TRP (e.g., TRP A) transmitting MC-DCI. In this way, if the base station configures a specific cell to operate with single-DCI based multi-TRP in the RRC configuration, the terminal may determine that the cell is not included in the scheduled cell indicated by the codepoint of the Scheduled cell set indicator or Scheduled cells indicator field.

[0534] The base station may configure at least one terminal to operate in one of the methods of the multiple embodiments described above. The base station may configure (e.g., via higher layer signaling) the terminal to operate in either the method according to one embodiment of the present disclosure described with reference to 1900 of FIG. 19 or the method according to one embodiment of the present disclosure described with reference to 1950 of FIG. 19.

[0535] <Example 2: Multi-cell scheduling scenario for S-DCI-based M-TRP transmitting MC-DCI>

[0536] As one embodiment of the present disclosure, a scheduling method using MC-DCI (Multi-cell scheduling DCI) is described. This embodiment can be operated in combination with other embodiments.

[0537] FIG. 20 is a diagram illustrating a multi-cell scheduling operation of a single DCI-based multiple TRP transmitting multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0538] In the example of Fig. 20, it is assumed that the CORESET or PDCCH resource including MC-DCI is set to be transmitted and received in S-DCI-based M-TRP.

[0539] First, if the S-DCI-based M-TRP cell is a scheduling cell, the control channel including MC-DCI may not be supported in the S-DCI-based M-TRP cell.

[0540] For example, MC-DCI transmitted by a single TRP cell can be simultaneously scheduled for the serving cell and multiple other cell(s) by the same TRP (one TRP, TRP corresponding to a single TRP cell), but it can be decided / defined / configured not to transmit MC-DCI in an S-DCI-based M-TRP cell. As another example, MC-DCI-based scheduling of an S-DCI-based M-TRP cell can be decided / defined / configured to support only S-DCI-based M-TRP cells. This can be considered to reduce scheduling complexity.

[0541] Second, if the S-DCI-based M-TRP cell is a scheduling cell, scheduling transmission in the M-DCI-based M-TRP cell on the control channel of the S-DCI-based M-TRP cell may not be supported.

[0542] For example, when MC-DCI is transmitted and received in an S-DCI-based M-TRP cell, the base station and the terminal can only transmit and receive data within a single TRP transmission or the S-DCI-based M-TRP cell. In other words, when MC-DCI is transmitted and received in an S-DCI-based M-TRP cell, the base station and the terminal do not expect that the MC-DCI will schedule transmission in the M-DCI-based M-TRP cell. This can reduce scheduling overhead and scheduling complexity by preventing MC-DCI scheduling of an M-DCI-based M-TRP cell in an S-DCI-based M-TRP cell.

[0543] Third, if the S-DCI-based M-TRP cell is a scheduling cell, scheduling of transmission in a single TRP cell can be supported on the control channel of the S-DCI-based M-TRP cell.

[0544] For example, an MC-DCI transmitted by an S-DCI-based M-TRP cell may be configured to schedule at least one single TRP cell and / or S-DCI-based M-TRP cell(s) simultaneously.

[0545] Specifically, as shown in FIG. 20, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the second cell (cell #2) can indicate the first PDSCH resource scheduled for the first cell (cell #1) and the second PDSCH resource corresponding to multiple TRP cells based on a single DCI scheduled for the second cell (cell #2).

[0546] For the first PDSCH to second PDSCH resource allocation, the base station may include a block number and / or resource allocation area related information in the FDRA field in the DCI. Here, the block corresponds to frequency domain resource allocation for the Cell, and the block numbers are arranged in ascending order of the Serving Cell Index, and the block corresponding to frequency domain resource allocation for the Cell with the smallest Serving Cell Index has Block Number 1. In particular, the PDSCH resource scheduling method received in the first TRP and the second TRP, such as the second PDSCH, may be set based on at least one of the Multi-TRP FDM scheme A and the Multi-TRP FDM scheme B described above.

[0547] The base station may include TDRA and / or resource allocation area related information in the DCI for the first PDSCH to second PDSCH resource allocation. Here, the TDRA field It's a beat, and here is the number of entries in the upper layer parameter TDRA-FieldIndexListDCI-1-3. Each entry of the upper layer parameter TDRA-FieldIndexListDCI-1-3 may contain a Time domain resource assignment index for a BWP of each cell in the scheduled cell set. Here, the Time domain resource assignment indices for all cells may be arranged in the ascending order of the serving cell, and the 'Time domain resource assignment' indices for all BWPs of the cell may be arranged in the ascending order of the upper layer parameter BWP-Id. The above description is an example of a case where DCI format 1_3 is used as the DCI. If DCI format 0_3 is used as the DCI, TDRA-FieldIndexListDCI-1-3 in the above description may be replaced with TDRA-FieldIndexListDCI-0-3. In the above description, all cells are cells configured through upper layer signaling as cells for which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of Fig. 20, cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2 can be configured depending on whether cell#3, cell#4 are configured through the corresponding upper layer signaling.

[0548] The base station can instruct the terminal through DCI beamforming-related information for transmission of the first PDSCH or second PDSCH.

[0549] In one embodiment, the beamforming related information may include a TCI field and / or a TCI selection field, and based on this field, the base station and the terminal may determine whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP. Specifically, the TCI field may include the following information. For example, the TCI field and / or the TCI selection field are set to 0 bits if tci-PresentInDCI is not activated in RRC, and otherwise can be set to bits. Here is the number of entries in the upper layer parameter tci-ListDCI-1-3. This field is used to indicate the entries in the upper layer parameter tci-ListDCI-1-3 according to Table 29.

[0550] Each entry of the upper layer parameter tci-ListDCI-1-3 contains a “Transmission Configuration Indication” Index for each Cell in the Scheduled Cell Set, and arranges the “Transmission Configuration Indication” Indices for all Cells in ascending order of the Serving Cell Index. Each “Transmission Configuration Indication” index is 3 bits. If the BWP indicator field indicates a bandwidth part other than the Active bandwidth part, and if the upper layer parameter tci-PresentInDCI is not enabled for a CORESET used in a PDCCH containing DCI format 1_3, the UE may assume that tci-PresentInDCI is not enabled for all CORESETs of the indicated bandwidth part. Otherwise, the UE may assume that tci-PresentInDCI is enabled for all CORESETs of the indicated bandwidth part. Here, the terminal can determine whether the codepoint value of the TCI field indicates multiple TCI states for unified TCI states or a single TCI state based on the previously received and confirmed MAC CE. Finally, the terminal can determine whether to schedule only PDSCHs of the same TRP in a specific cell or to schedule multiple PDSCHs of two or more TRPs by checking the information indicated by the codepoint of the received TCI field. The above description is an example of a case where DCI format 1_3 is used as DCI, and if DCI format 0_3 is used as DCI, tci-ListDCI-1-3 in the above description can be replaced with tci-ListDCI-0-3.In the above description, all cells are cells configured through upper layer signaling as cells for which MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in the example of Fig. 20, cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2 can be configured depending on whether cell#3, cell#4 are configured through the corresponding upper layer signaling.

[0551] Additionally, the TCI selection field can be set to 0 bits if the upper RRC layer parameter, tciSelection-PresentInDCI, is not set, otherwise 2 bits according to Table 30 can be specified.

[0552] The base station can instruct the terminal about the set (set) of co-scheduled cell(s) through DCI.

[0553] In one embodiment, the information related to the set of co-scheduled cells(s) may be a 1-bit Scheduled cell set indicator value that the base station indicates to the terminal. The terminal may determine whether the PDSCH transmission is by Single TRP or by S-DCI-based M-TRP based on the Scheduled cell set indicator. The interpretation of the Scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, if it is identified that MC-DCI is transmitted and received by Multi-cell scheduling of S-DCI-based M-TRP, the interpretation of the scheduled cell set indicator may be as follows.

[0554] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but as in the example of FIG. 20, for a cell that supports PDSCH transmission by Single TRP, such as the first cell, the value of the Scheduled cell set indicator is indicated as 1 (or 0), and for a cell that indicates PDSCH transmission by S-DCI-based M-TRP, such as the second cell which is a serving cell, the value of the Scheduled cell set indicator is indicated as 0 (or 1), so that the base station and the terminal can implicitly indicate / confirm the first PDSCH transmission by Single TRP in the first cell and indicate / confirm the second PDSCH transmission by S-DCI-based M-TRP in the second cell based on the Scheduled cell set indicator field information. When the value of the scheduled cell set indicator is 0 (or 1), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP, and when the value of the scheduled cell set indicator is 1 (or 0), a scheduled cell included in the scheduled cell set can be identified as corresponding to a single TRP. In addition, a terminal that has confirmed the scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by the S-DCI-based M-TRP in the second cell is transmitted in the second TRP or in the first TRP and the second TRP by combining at least one of the methods among the other embodiments described above. This example is an example in which the scheduled cell set indicator is set to 1 bit.

[0555] In another embodiment, the information related to the set of co-scheduled cells(s) may be a scheduled cell set indicator value of 2 bits that the base station indicates to the terminal. The terminal may determine whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP based on the scheduled cell set indicator. The interpretation of the scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, if it is identified that MC-DCI is transmitted and received by multi-cell scheduling of S-DCI-based M-TRP, the interpretation of the scheduled cell set indicator may be as follows.

[0556] Specifically, the scheduled cell set indicator is an indicator indicating a set of scheduled cells, but as in the example of FIG. 20, for a cell supporting PDSCH transmission by Single TRP, such as the first cell, the value of the scheduled cell set indicator is indicated as 10 (or 00), and for a cell indicating PDSCH transmission by S-DCI-based M-TRP, such as the second cell, the value of the scheduled cell set indicator is indicated as 00 (or 10), so that the base station and the terminal can explicitly indicate / confirm the first PDSCH transmission by Single TRP in the first cell and indicate / confirm the second PDSCH transmission by S-DCI-based M-TRP in the second cell based on the first value that appears first among the two bits of the Scheduled cell set indicator field. In this case, the MSB of the scheduled cell set indicator 2 bits indicates whether the cell supports PDSCH transmission by single TRP or PDSCH transmission by multi TRP, and the LSB of the scheduled cell set indicator can indicate the scheduled cell set.

[0557] The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 1 (or 0), and the terminal can confirm from the first value that the PDSCH transmission by Single TRP is performed in the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value. The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 0 (or 1), and the terminal can confirm from the first value that the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value is performed the PDSCH transmission by S-DCI based M-TRP. In addition, the terminal that has confirmed the scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by the S-DCI-based M-TRP in the second cell is transmitted in the first TRP, in the second TRP, and / or in the first TRP and the second TRP by combining at least one of the methods of the other embodiments described above. This example is an example in which the scheduled cell set indicator is set to 2 bits. According to one embodiment of the present disclosure, the scheduled cell set indicator may be 1 bit or 2 bits, and any one of the embodiments described above may be applied depending on the number of bits of the scheduled cell set indicator.

[0558] In the previously described 2-bit scheduled cell set indicator related embodiment, a method of increasing the bitwidth within a single scheduled cell set indicator field, that is, a bit indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP and a bit indicating the scheduled cell set are considered to be distinguished within the scheduled cell set indicator field. However, a separate independent field indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP may be included in the DCI.

[0559] The base station may instruct the terminal through DCI the antenna port-related information of the first PDSCH and the second PDSCH for transmission of co-scheduled PDSCH(s) (e.g., the first PDSCH and the second PDSCH).

[0560] In one embodiment, when AntennaPortsDCI-1-3=type1a is set from the upper layer signaling, the number of bits in the field representing the antenna port is can be determined by bits. This is set independently for each scheduled cell(s), where The value can be determined as the number of cells by the scheduled cell set parameter ScheduledCell-ListDCI-1-3 during RRC setup. Here, r corresponds to a value of 1 from the cell with the smallest serving cell index, and can be sequentially mapped in ascending order of serving cell index.

[0561] In another embodiment, if AntennaPortsDCI-1-3=type2 is set from the upper layer signaling, the number of bits of the antenna port is block number 1, block number 2, …, block number As such, each block can correspond to antenna port information for a scheduled cell. Here, the blocks correspond to each serving cell in ascending order of the serving cell index, and each block corresponds to antenna port information for the scheduled cell. Each block is arranged in ascending order of the corresponding Serving Cell Index, and the block number corresponding to the antenna port information for the cell with the smallest Serving Cell Index is 1.

[0562] If AntennaPortsDCI-1-3=type1a Or for AntennaPortsDCI-1-3= type2, each block is 4, 5 or 6 bits and points to an index of a row of a predefined antenna port table according to the DM-RS type and maxlength value. Each row of the antenna port table contains the Number of DMRS CDM group(s) without data, the Number of DMRS ports and / or the Number of front-load symbols, and thus the antenna port table contains the relationship between the Number of CDM groups without data, the Number of DMRS ports and / or the Number of front-load symbols. The values ​​of the Number of CDM groups without data being 1, 2 and 3 mean CDM groups {0}, {0,1} and {0, 1,2}, respectively.

[0563] The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, AntennaPortsDCI-1-3 in the above description can be replaced with AntennaPortsDCI-0-3 and ScheduledCell-ListDCI-1-3 can be replaced with ScheduledCell-ListDCI-0-3.

[0564] Meanwhile, in the case of the third cell (cell #3) and the fourth cell (cell #4) operating as multi-DCI-based multi-TRP, the PDSCH transmitted in the first TRP and the second TRP can be separately scheduled in each PDCCH transmitted in the first TRP and the second TRP, so the base station may not perform PDSCH scheduling for data transmission of TRP B directly in TRP A transmitting MC-DCI. In this way, if the base station configures a specific cell to operate as multi-DCI-based multi-TRP in the RRC configuration, the terminal may determine that the cell is not included in the scheduled cell indicated by the codepoint of the Scheduled cell set indicator and / or Scheduled cells indicator field.

[0565] <Example 3: Multi-cell scheduling scenario for M-DCI-based M-TRP transmitting MC-DCI>

[0566] FIGS. 21A to 21C are diagrams illustrating a multi-cell scheduling operation of multiple DCI-based multiple TRPs for transmitting multi-carrier downlink control information (MC-DCI) in a wireless communication system according to one embodiment of the present disclosure.

[0567] In the examples of FIGS. 21A to C, it is assumed that CORESET or PDCCH resources including MC-DCI are configured to be transmitted and received in M-DCI-based M-TRP.

[0568] First, if an M-DCI-based M-TRP cell is a scheduling cell, a control channel including MC-DCI may not be supported in the M-DCI-based M-TRP cell.

[0569] For example, MC-DCI transmitted in a single TRP cell can be scheduled simultaneously for a serving cell and multiple other cell(s) by the same TRP (one TRP, TRP corresponding to a single TRP cell), but in an M-DCI-based M-TRP cell, it can be determined / defined / configured not to transmit MC-DCI and not to be able to transmit / receive DCI formats 1_3, 0_3 that support MC-DCI. As another example, MC-DCI-based scheduling of an M-DCI-based M-TRP cell can be determined / defined / configured to support only M-DCI-based M-TRP cells. This can be considered to reduce scheduling complexity.

[0570] Second, if the M-DCI-based M-TRP cell is a scheduling cell, scheduling transmission in a single TRP or S-DCI-based M-TRP cell on the control channel of the M-DCI-based M-TRP cell may be supported.

[0571] For example, an MC-DCI transmitted by an M-DCI-based M-TRP cell may be configured to simultaneously schedule at least one single TRP cell and / or S-DCI-based M-TRP cell(s).

[0572] Specifically, as in the example of 2100 in FIG. 21A, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the third cell (cell#3) may indicate the first PDSCH resource scheduled for the first cell (cell#1) (and the third PDSCH resource scheduled for the third cell (cell#3)). In addition, as in the example of 2130 in FIG. 21B, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the third cell (cell#3) may indicate the first PDSCH resource scheduled for the first cell (cell#1) (and the third PDSCH resource scheduled for the third cell (cell#3)) and the second PDSCH resource corresponding to multiple TRP cells based on a single DCI scheduled for the second cell (cell#2). In addition, as in the example of 2160 of FIG. 21C, the DCI transmitted by the first TRP (TRP A) through the PDCCH of the third cell (cell #3) may indicate the first PDSCH resource scheduled to the first cell (cell #1) (and the third PDSCH resource scheduled to the third cell (cell #3)) and the fourth PDSCH resource corresponding to multiple TRP cells based on M-DCI scheduled to the fourth cell (cell #4) (among which the first TRP (TRP A) is transmitted).

[0573] For the first to third PDSCH resource allocation, the base station may include a block number and / or resource allocation area related information in the FDRA field in the DCI. Here, the block corresponds to frequency domain resource allocation for the Cell, and the block numbers are arranged in ascending order of the Serving Cell Index, and the block corresponding to frequency domain resource allocation for the Cell with the smallest Serving Cell Index has Block Number 1. In particular, a PDSCH resource scheduling method received in the first TRP and / or the second TRP, such as the second to third PDSCHs, may be set based on at least one of the Multi-TRP FDM scheme A and the Multi-TRP FDM scheme B described above.

[0574] The base station may include TDRA and / or resource allocation area related information for the first to third PDSCH resource allocation. Here, the TDRA field It's a beat, and here is the number of entries in the upper layer parameter TDRA-FieldIndexListDCI-1-3. Each entry of the upper layer parameter TDRA-FieldIndexListDCI-1-3 may include a time domain resource assignment index for a BWP of each cell in the scheduled cell set. Here, the time domain resource assignment indices for all cells may be arranged in the ascending order of the serving cell. The 'time domain resource assignment' indices for all BWPs of the cell may be arranged in the ascending order of the upper layer parameter BWP-Id. The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, TDRA-FieldIndexListDCI-1-3 in the above description may be replaced with TDRA-FieldIndexListDCI-0-3. In the above description, all cells are cells configured through upper layer signaling as cells where MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in this example, it can be cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2, cell#3 depending on whether cell#4 is configured through the corresponding upper layer signaling.

[0575] The base station can instruct the terminal through DCI beamforming-related information for transmission of the first to third PDSCHs.

[0576] In one embodiment, the beamforming related information may include a TCI field and / or a TCI selection field, and based on this field, the base station and the terminal may determine whether the PDSCH transmission is by a single TRP or by a S-DCI-based M-TRP. Specifically, the TCI field may include the following information. For example, the TCI field and / or the TCI selection field are set to 0 bits if tci-PresentInDCI is not activated in RRC, and otherwise can be set to bits. Here is the number of entries in the upper layer parameter tci-ListDCI-1-3. This field is used to indicate the entries in the upper layer parameter tci-ListDCI-1-3 according to Table 29.

[0577] Each entry of the upper layer parameter tci-ListDCI-1-3 contains a "Transmission Configuration Indication" Index for each Cell in the Scheduled Cell Set, and arranges the "Transmission Configuration Indication" Indices for all Cells in ascending order of the Serving Cell Index. Each "Transmission Configuration Indication" index is 3 bits. If the BWP indicator field indicates a bandwidth part other than the Active bandwidth part, and if the upper layer parameter tci-PresentInDCI is not enabled for a CORESET used in a PDCCH containing DCI format 1_3, the UE may assume that tci-PresentInDCI is not enabled for all CORESETs of the indicated bandwidth part. Otherwise, the UE may assume that tci-PresentInDCI is enabled for all CORESETs of the indicated bandwidth part. Here, the terminal can determine, based on the previously received and confirmed MAC CE, whether the codepoint value of the TCI field indicates multiple TCI states for unified TCI states or a single TCI state. Consequently, the terminal can determine whether to schedule only PDSCHs of the same TRP in a specific cell or to schedule multiple PDSCHs of two or more TRPs by checking the information indicated by the codepoint of the received TCI field.The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, tci-ListDCI-1-3 in the above description can be replaced with tci-ListDCI-0-3. In the above description, all cells are cells configured through upper layer signaling as cells where MC-DCI (DCI format 0_3 / 1_3) is scheduled. For example, in this example, it can be cell#1, cell#2, cell#3, cell#4 or cell#1, cell#2, cell#3 depending on whether cell#4 is configured through the corresponding upper layer signaling.

[0578] Additionally, the TCI selection field can be set to 0 bits if the upper RRC layer parameter, tciSelection-PresentInDCI, is not set, otherwise 2 bits according to Table 30 can be specified.

[0579] The base station can instruct the terminal about the set (set) of co-scheduled cell(s) through DCI.

[0580] In one embodiment, the information related to the set of co-scheduled cell(s) may be a 1-bit Scheduled cell set indicator value that the base station indicates to the terminal. The terminal may determine whether the PDSCH transmission is by Single TRP, by S-DCI-based M-TRP, and / or by M-DCI-based M-TRP based on the Scheduled cell set indicator. The interpretation of the Scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, when it is identified that MC-DCI is transmitted and received by Multi-cell scheduling of M-DCI-based M-TRP, the interpretation of the scheduled cell set indicator may be as follows. This example is an example in which the scheduled cell set indicator is set to 1 bit.

[0581] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but in the case of a third-cell scheduling cell, which is an M-DCI-based M-TRP cell as in the example of 2100 of FIG. 21A, the value of the Scheduled cell set indicator is indicated as 1 (or 0) for a cell that supports PDSCH transmission by a single TRP, such as the first cell, and the value of the Scheduled cell set indicator is indicated as 0 (or 1) for a cell that indicates PDSCH transmission by M-DCI-based M-TRP, such as the third cell that is a serving cell, so that the base station and the terminal can implicitly indicate / confirm the first PDSCH transmission by a single TRP in the first cell and indicate / confirm the third PDSCH transmission by M-DCI-based M-TRP in the third cell based on the Scheduled cell set indicator field information.

[0582] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but as in the example of 2130 of FIG. 21B, for cells that support PDSCH transmission by a single TRP, such as the first cell and the second cell, and for cells that indicate PDSCH transmission by S-DCI-based M-TRP, the value of the Scheduled cell set indicator is indicated as 1 (or 0), and for cells that indicate PDSCH transmission by M-DCI-based M-TRP, such as the third cell which is a serving cell, the value of the Scheduled cell set indicator is indicated as 0 (or 1), so that the base station and the terminal can implicitly indicate / confirm the first PDSCH by Single TRP in the first cell and the S-DCI-based M-TRP in the second cell, and indicate / confirm the third PDSCH transmission by M-DCI-based M-TRP in the third cell based on the Scheduled cell set indicator field information.

[0583] Specifically, the Scheduled cell set indicator is an indicator indicating a set of Scheduled cells, but the base station and the terminal indicate the value of the Scheduled cell set indicator as 1 (or 0) for cells that support PDSCH transmission by a single TRP, such as the first cell and the second cell, as in the example of 2160 of FIG. 21C, and for cells that indicate PDSCH transmission by S-DCI-based M-TRP, such as the third cell, which is a serving cell, and the fourth cell that indicates PDSCH transmission by M-DCI-based M-TRP, such as the third cell, by indicating the value of the Scheduled cell set indicator as 0 (or 1), so that the base station and the terminal can implicitly indicate / confirm the first PDSCH by Single TRP in the first cell and the S-DCI-based M-TRP in the second cell, and indicate / confirm the third PDSCH transmission by M-DCI-based M-TRP in the third cell and the fourth cell based on the Scheduled cell set indicator field information.

[0584] In another embodiment, the information related to the set of co-scheduled cells(s) may be a scheduled cell set indicator value of 2 bits that the base station indicates to the terminal. The terminal may determine whether the PDSCH transmission is by Single TRP, PDSCH transmission is by S-DCI-based M-TRP, or M-DCI-based M-TRP transmission based on the scheduled cell set indicator. The interpretation of the scheduled cell set indicator may be determined depending on whether the above-described embodiment of the present disclosure is applied. For example, if it is identified that MC-DCI is transmitted and received by Multi-cell scheduling of S-DCI-based M-TRP, the interpretation of the scheduled cell set indicator may be as follows. This example is an example in which the scheduled cell set indicator is set to 2 bits. According to an embodiment of the present disclosure, the scheduled cell set indicator may be 1 bit or 2 bits, and any one of the above-described embodiments may be applied depending on the number of bits of the scheduled cell set indicator.

[0585] Specifically, the scheduled cell set indicator is an indicator indicating a set of scheduled cells, but as in the example of 2130 of FIG. 21B, for a cell supporting PDSCH transmission by Single TRP, such as the first cell, the value of the scheduled cell set indicator is indicated as 10, for a cell indicating PDSCH transmission by S-DCI-based M-TRP, such as the second cell, the value of the scheduled cell set indicator is indicated as 11, and for a cell indicating PDSCH transmission by M-DCI-based M-TRP, such as the third cell (and the fourth cell), the value of the scheduled cell set indicator is indicated as 00, so that the base station and the terminal explicitly indicate / confirm the first PDSCH transmission by Single TRP in the first cell based on the first value that appears first among the two bits of the Scheduled cell set indicator field, the second PDSCH transmission by S-DCI-based M-TRP in the second cell, and the second PDSCH transmission by M-DCI-based M-TRP in the third cell. The third PDSCH transmission can be determined. The bit values ​​are examples and can be changed. In this case, the MSB of the 2-bit scheduled cell set indicator indicates whether the cell supports PDSCH transmission by single TRP or PDSCH transmission by multi TRP, and the LSB of the scheduled cell set indicator can indicate the scheduled cell set.

[0586] The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 1 (or 0), and the terminal can confirm from the first value that the PDSCH transmission by Single TRP is performed in the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value. The base station can indicate to the terminal that the first value among the two bits of the scheduled cell set indicator field is 0 (or 1), and the terminal can confirm from the first value that the cell(s) of the last value among the two bits indicating the actual scheduled cell set indicator value is performed the PDSCH transmission by M-DCI based M-TRP. In addition, a terminal that has confirmed the Scheduled cell set indicator information can determine whether the actual (actual) transmission of the PDSCH by M-DCI-based M-TRP in the second cell is performed by combining at least one of the methods among the other embodiments described above, including the method of performing at least one of the transmission in the first TRP, the transmission in the second TRP, and / or the transmission in the first TRP and the second TRP.

[0587] In the previously described 2-bit scheduled cell set indicator related embodiment, a method of increasing the bitwidth within a single scheduled cell set indicator field, that is, a bit indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP and a bit indicating the scheduled cell set are considered to be distinguished within the scheduled cell set indicator field. However, a separate independent field indicating whether the cell supports PDSCH transmission by Single TRP or PDSCH transmission by Multi TRP may be included in the DCI.

[0588] The base station may instruct the terminal through DCI the antenna port related information of the first to fourth PDSCHs for transmission of co-scheduled PDSCH(s) (e.g., the first to fourth PDSCHs).

[0589] In one embodiment, when AntennaPortsDCI-1-3=type1a is set from the upper layer signaling, the number of bits in the field representing the antenna port is can be determined by bits. This is set independently for each scheduled cell(s), where The value can be determined as the number of cells by the scheduled cell set parameter ScheduledCell-ListDCI-1-3 during RRC setup. Here, r corresponds to a value of 1 from the cell with the smallest serving cell index, and can be sequentially mapped in ascending order of serving cell index.

[0590] In another embodiment, if AntennaPortsDCI-1-3=type2 is set from the upper layer signaling, the number of bits of the antenna port is block number 1, block number 2, …, block number As such, each block can correspond to antenna port information for a scheduled cell. Here, the blocks correspond to each serving cell in ascending order of the serving cell index, and each block corresponds to antenna port information for the scheduled cell. Each block is arranged in ascending order of the corresponding Serving Cell Index, and the block number corresponding to the antenna port information for the cell with the smallest Serving Cell Index is 1.

[0591] If AntennaPortsDCI-1-3=type1a Or for AntennaPortsDCI-1-3= type2, each block is 4, 5 or 6 bits and points to an index of a row of a predefined antenna port table according to the DM-RS type and maxlength value. Each row of the antenna port table contains the Number of DMRS CDM group(s) without data, the Number of DMRS ports and / or the Number of front-load symbols, and thus the antenna port table contains the relationship between the Number of CDM groups without data, the Number of DMRS ports and / or the Number of front-load symbols. The values ​​of the Number of CDM groups without data being 1, 2 and 3 mean CDM groups {0}, {0,1} and {0, 1,2}, respectively.

[0592] The above description is an example of a case where DCI format 1_3 is used as DCI. If DCI format 0_3 is used as DCI, AntennaPortsDCI-1-3 in the above description can be replaced with AntennaPortsDCI-0-3 and ScheduledCell-ListDCI-1-3 can be replaced with ScheduledCell-ListDCI-0-3.

[0593] Meanwhile, in the case of the third cell (cell #3) and the fourth cell (cell #4) operating as multi-DCI-based multi-TRP, the PDSCH transmitted in the first TRP and the second TRP can be separately scheduled in each PDCCH transmitted in the first TRP and the second TRP, so that the base station may not perform PDSCH scheduling for data transmission of TRP B directly in TRP A transmitting MC-DCI. In this way, even if the base station configures a specific cell to operate as multi-DCI-based multi-TRP in the RRC configuration, if the serving cell of a specific terminal is an M-DCI-based M-TRP cell, the terminal can determine that the terminal is included in the scheduled cell indicated by the codepoint of the Scheduled cell set indicator and / or Scheduled cells indicator field.

[0594] The base station may instruct the terminal to transmit co-scheduled PDSCH(s) (e.g., the first to fourth PDSCHs) via DCI, information corresponding to CORESETPoolindex. The information corresponding to CORESETPoolindex may include 1 bit corresponding to each scheduled cell.

[0595] In one embodiment, the information corresponding to CORESETPoolindex here may indicate 0 (or 1) if the PDSCH is scheduled in the same TRP as the TRP in which the DCI is transmitted, and may indicate 1 (or 0) if the PDSCH is scheduled in a different TRP (cross TRP) from the TRP in which the DCI is transmitted.

[0596] In another embodiment, the information corresponding to CORESETPoolindex here may indicate 0 (or 1) for a cell that uses the same TRP scheduling scheme as the serving cell to which the DCI is transmitted, and may indicate 1 (or 0) for a cell that uses a different TRP scheduling scheme. For example, if the third cell, which is a serving cell, is an M-DCI-based M-TRP transmission cell, the information corresponding to CORESETPoolindex may indicate 0 (or 1) for the M-DCI-based M-TRP transmission cell, such as the fourth cell, and the information corresponding to CORESETPoolindex may indicate 1 (or 0) for the first cell, which is a single TRP transmission cell, and the second cell, which is an S-DCI-based M-TRP transmission cell.

[0597] FIG. 22 is a diagram illustrating the operation of a terminal according to one embodiment of the present disclosure. The flowchart of FIG. 22 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart. For example, although illustrated as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0598] The terminal can transmit terminal capabilities to the base station (22-00). At this time, the terminal capabilities may include at least one of: whether support for multiple integrated TCI states is possible; whether support for receiving MC-DCI indicating S-TRP-based multi-cell scheduling and PDSCH reception based on the MC-DCI reception, as in the first embodiment; whether support for receiving MC-DCI indicating S-DCI-based M-TRP multi-cell scheduling and PDSCH reception based on the MC-DCI reception, as in the second embodiment; and whether support for receiving MC-DCI indicating M-DCI-based M-TRP multi-cell scheduling and PDSCH reception based on the MC-DCI reception, as in the third embodiment.

[0599] Thereafter, the terminal can receive upper layer signaling configuration information from the base station (22-05). At this time, the upper layer signaling configuration information may include at least one of the integrated TCI state and configuration information for upper layer parameters for the first to third embodiments described above.

[0600] Afterwards, the terminal can receive MC-DCI from the base station and identify at least one of the information about the FDRA field, TDRA field, TCI state field, TCI selection field, Scheduled cell set indicator field, TCI state field, TCI selection field, and antenna port field in the MC-DCI (22-10).

[0601] Thereafter, the terminal can receive at least one PDSCH scheduled by the MC-DCI based on at least one of the received MC-DCI information (22-15). For example, the terminal can receive and decode part or all of the data based on the terminal's capabilities and the base station's configuration information.

[0602] More specific operations of the terminal according to one embodiment can be described based on the above-described embodiment.

[0603] FIG. 23 is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure. The flowchart of FIG. 23 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart. For example, although illustrated as a series of steps, the various steps in each diagram may overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0604] The base station can receive the terminal capability transmission of the terminal (23-00). At this time, the terminal capability may include whether support for multiple integrated TCI states is possible, whether support for receiving MC-DCI indicating S-TRP-based multi-cell scheduling as in the first embodiment and receiving PDSCH based on the MC-DCI reception is possible, whether support for receiving MC-DCI indicating S-DCI-based M-TRP multi-cell scheduling as in the second embodiment and receiving PDSCH based on the MC-DCI reception is possible, and whether support for receiving MC-DCI indicating M-DCI-based M-TRP multi-cell scheduling as in the third embodiment and receiving PDSCH based on the MC-DCI reception is possible.

[0605] Thereafter, the base station may transmit upper layer signaling configuration information to the terminal (23-05). At this time, the upper layer signaling configuration information may include at least one of the integrated TCI state and configuration information for upper layer parameters for the first to third embodiments described above.

[0606] Thereafter, the base station can transmit to the terminal an MC-DCI including at least one of information about an FDRA field, a TDRA field, a TCI state field, a TCI selection field, a Scheduled cell set indicator field, a TCI state field, a TCI selection field, and an antenna port field.

[0607] Afterwards, the base station can transmit at least one PDSCH scheduled by MC-DCI (22-15). Here, the base station can schedule some or all of the data based on the terminal's capabilities and the base station's configuration information.

[0608] More specific operations of the base station according to one embodiment can be described based on the above-described embodiment.

[0609] FIG. 24 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0610] Referring to FIG. 24, the terminal may include a transceiver, which refers to a terminal receiving unit (24-00) and a terminal transmitting unit (24-10), a memory (not shown), and a terminal processing unit (24-05, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver units (24-00, 24-10), the memory, and the terminal processing unit (24-05) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the transceiver unit, the memory, and the processor may be implemented in the form of a single chip.

[0611] A transceiver unit can transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transceiver unit may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is merely one embodiment of the transceiver unit, and the components of the transceiver unit are not limited to the RF transmitter and RF receiver.

[0612] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0613] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0614] Additionally, the processor can control a series of processes to enable the terminal to operate according to the aforementioned embodiments. For example, the processor can receive DCI consisting of two layers and control components of the terminal to simultaneously receive multiple PDSCHs. There may be multiple processors, and the processors can perform component control operations of the terminal by executing programs stored in memory.

[0615] FIG. 25 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0616] Referring to FIG. 25, the base station may include a transceiver, which refers to a base station receiver (25-00) and a base station transmitter (25-10), a memory (not shown), and a base station processing unit (25-05, or a base station control unit or processor). Depending on the communication method of the base station described above, the transceiver units (25-00, 25-10), the memory, and the base station processing unit (25-05) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0617] The transceiver can transmit and receive signals with the terminal. Here, the signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0618] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit the signal output from the processor through the wireless channel.

[0619] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0620] The processor can control a series of processes to enable the base station to operate according to the aforementioned embodiments of the present disclosure. For example, the processor can configure two layers of DCIs containing allocation information for multiple PDSCHs and control each component of the base station to transmit them. There may be multiple processors, and the processors can perform component control operations of the base station by executing programs stored in memory.

[0621] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0622] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0623] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0624] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0625] In the specific embodiments of the present disclosure described above, components included in the embodiments are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0626] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-mentioned embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented based on an FDD LTE system, other modifications based on the technical idea of ​​the above-mentioned embodiments can be implemented with other systems such as a TDD LTE system, a 5G or NR system.

[0627] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0628] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0629] In addition, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment within a scope that does not damage the essence thereof.

[0630] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

Claims

1. In a method performed by a terminal in a communication system, A step of receiving information related to a set of scheduled cells through upper layer signaling; A step of receiving DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the above scheduled cell set through a scheduling cell; A step of identifying whether each of the one or more scheduled cells is operated as a single transmission and reception point (TRP) or multiple TRPs based on the DCI; and A method comprising the step of performing the data communication through the one or more scheduled cells based on the identification.

2. In paragraph 1, The above DCI includes a scheduled cell set indicator field, If the Scheduled Cell Set Indicator field is 1 bit: The first code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a single TRP, The second code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a multiple TRP, If the above scheduled cell set indicator field is 2 bits, The least significant bit (LSB) of the scheduled cell set indicator field indicates a scheduled cell associated with the scheduled cell set indicator field, A method in which the MSB (most significant bit) of the above scheduled cell set indicator field indicates whether the scheduled cell indicated by the LSB is operated as a single TRP or as multiple TRPs.

3. In paragraph 1, The DCI includes one or more transmission configuration indication (TCI) state fields corresponding to the one or more scheduled cells, and the one or more TCI state fields are sorted in ascending order of indices of the one or more scheduled cells. If the code point of the TCI status field indicates multiple TCI states, the scheduled cell corresponding to the TCI status field is operated as multiple TRPs. A method in which a scheduled cell corresponding to a TCI status field is operated as a single TRP when a code point of a TCI status field indicates a single TCI status.

4. In paragraph 1, The above DCI includes a field related to a CORESET (control resource set) pool index, and one or more bits included in the field related to the CORESET pool index correspond to the one or more scheduled cells, A method in which whether each of the one or more scheduled cells operates as a single TRP or multiple TRPs is identified based on the one or more bits.

5. In paragraph 1, The above scheduling cell is operated as a single TRP, a single DCI-based multi-TRP, or a multi DCI-based multi-TRP. The above identification is based on whether the scheduling cell is operated as the single TRP, the single DCI-based multi-TRP or the multi-DCI-based multi-TRP, When the above scheduling cell is operated as a single TRP, a cell operated as a single DCI-based multi-TRP is not included in the one or more scheduled cells. A method in which the above scheduling cell is operated as a single DCI-based multi-TRP, and the cell operated as a multi-DCI-based multi-TRP is not included in the one or more scheduled cells.

6. In paragraph 1, Further comprising a step of receiving information for setting the type of antenna port for the DCI through the upper layer signaling, The DCI further includes a field indicating an antenna port for the one or more scheduled cells, When the type of the antenna port is set to the first type, the number of bits of the field representing the antenna port is the maximum value among a plurality of candidate values ​​corresponding to a plurality of cells included in the plurality of scheduled cell sets, and each candidate value is one of 4 bits, 5 bits, or 6 bits. A method in which, when the type of the above antenna port is set to the second type, the field representing the antenna port includes one or more blocks corresponding to the one or more scheduled cells, each block representing an antenna port for the corresponding scheduled cell, and the number of bits of each block is one of 4 bits, 5 bits, or 6 bits.

7. At the terminal of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Receive information related to the scheduled cell set through upper layer signaling; Receiving DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the above scheduled cell set through a scheduling cell; Identifying whether each of the one or more scheduled cells is operated as a single transmission and reception point (TRP) or multiple TRPs based on the DCI; and A terminal configured to perform data communication through one or more scheduled cells based on the above identification.

8. In paragraph 7, The above DCI includes a scheduled cell set indicator field, If the Scheduled Cell Set Indicator field is 1 bit: The first code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a single TRP, The second code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a multiple TRP, If the above scheduled cell set indicator field is 2 bits, The least significant bit (LSB) of the scheduled cell set indicator field indicates a scheduled cell associated with the scheduled cell set indicator field, The MSB (most significant bit) of the above scheduled cell set indicator field indicates whether the scheduled cell indicated by the LSB is operated as a single TRP or multiple TRPs.

9. In paragraph 8, The DCI includes one or more transmission configuration indication (TCI) state fields corresponding to the one or more scheduled cells, and the one or more TCI state fields are sorted in ascending order of indices of the one or more scheduled cells. If the code point of the TCI status field indicates multiple TCI states, the scheduled cell corresponding to the TCI status field is operated as multiple TRPs. A terminal in which a scheduled cell corresponding to the TCI status field is operated as a single TRP when the code point of the TCI status field indicates one TCI status.

10. In paragraph 8, The above DCI includes a field related to a CORESET (control resource set) pool index, and one or more bits included in the field related to the CORESET pool index correspond to the one or more scheduled cells, A terminal, wherein whether each of the one or more scheduled cells operates as a single TRP or multiple TRPs is identified based on the one or more bits.

11. In paragraph 8, The above scheduling cell is operated as a single TRP, a single DCI-based multi-TRP, or a multi DCI-based multi-TRP. The above identification is based on whether the scheduling cell is operated as the single TRP, the single DCI-based multi-TRP or the multi-DCI-based multi-TRP, When the above scheduling cell is operated as a single TRP, a cell operated as a single DCI-based multi-TRP is not included in the one or more scheduled cells. A terminal in which the above scheduling cell is operated as a single DCI-based multi-TRP, and the cell operated as a multi-DCI-based multi-TRP is not included in one or more of the above scheduled cells.

12. In paragraph 8, The above processor is configured to receive information setting the type of antenna port for the DCI through the upper layer signaling, The DCI further includes a field indicating an antenna port for the one or more scheduled cells, When the type of the antenna port is set to the first type, the number of bits of the field representing the antenna port is the maximum value among a plurality of candidate values ​​corresponding to a plurality of cells included in the plurality of scheduled cell sets, and each candidate value is one of 4 bits, 5 bits, or 6 bits. When the type of the above antenna port is set to the second type, the field representing the antenna port includes one or more blocks corresponding to the one or more scheduled cells, each block representing an antenna port for the corresponding scheduled cell, and the number of bits of each block is one of 4 bits, 5 bits, or 6 bits.

13. In a method performed by a base station in a communication system, A step of transmitting information related to a set of scheduled cells through upper layer signaling; A step of transmitting DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the above scheduled cell set through a scheduling cell; and Comprising a step of performing the data communication through the one or more scheduled cells, The method wherein the DCI relates to whether each of the one or more scheduled cells operates as a single TRP (transmission and reception point) or as multiple TRPs.

14. In paragraph 13, The above DCI includes a scheduled cell set indicator field, If the Scheduled Cell Set Indicator field is 1 bit: The first code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a single TRP, The second code point of the above scheduled cell set indicator field indicates that the scheduled cell associated with the above scheduled cell set indicator field is operated as a multiple TRP, If the above scheduled cell set indicator field is 2 bits, The least significant bit (LSB) of the scheduled cell set indicator field indicates a scheduled cell associated with the scheduled cell set indicator field, A method in which the MSB (most significant bit) of the above scheduled cell set indicator field indicates whether the scheduled cell indicated by the LSB is operated as a single TRP or as multiple TRPs.

15. In the base station of the communication system, Transmitter and receiver; and A processor connected to the transceiver, the processor comprising: Transmitting information related to the set of scheduled cells via upper layer signaling; Transmitting DCI (downlink control information) for scheduling data communication in one or more scheduled cells among a plurality of cells included in the above scheduled cell set through a scheduling cell; and It is set to perform the data communication through the one or more scheduled cells, The DCI relates to whether each of the one or more scheduled cells is operated as a single transmission and reception point (TRP) or as multiple TRPs.

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