WO2024091072A1 - Procédé et appareil de détermination de faisceau pour l'émission ou la réception d'informations de commande de liaison descendante dans un système de communication sans fil - Google Patents

Procédé et appareil de détermination de faisceau pour l'émission ou la réception d'informations de commande de liaison descendante dans un système de communication sans fil Download PDF

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WO2024091072A1
WO2024091072A1 PCT/KR2023/016907 KR2023016907W WO2024091072A1 WO 2024091072 A1 WO2024091072 A1 WO 2024091072A1 KR 2023016907 W KR2023016907 W KR 2023016907W WO 2024091072 A1 WO2024091072 A1 WO 2024091072A1
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Prior art keywords
coreset
tci
tci state
field
terminal
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PCT/KR2023/016907
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English (en)
Korean (ko)
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정의창
장영록
명세호
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삼성전자 주식회사
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Publication of WO2024091072A1 publication Critical patent/WO2024091072A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • This disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method for determining a transmission/reception beam of a physical channel/signal in a wireless communication system and a device capable of performing the same.
  • 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and includes sub-6 GHz ('Sub 6GHz') bands such as 3.5 gigahertz (3.5 GHz) as well as millimeter wave (mm) bands such as 28 GHz and 39 GHz. It is also possible to implement it in the ultra-high frequency band ('Above 6GHz') called Wave.
  • 'Sub 6GHz' sub-6 GHz
  • mm millimeter wave
  • Wave ultra-high frequency band
  • 6G mobile communication technology which is called the system of Beyond 5G
  • Terra is working to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low delay time that is reduced to one-tenth. Implementation in Terahertz bands (e.g., 95 GHz to 3 THz) is being considered.
  • ultra-wideband services enhanced Mobile BroadBand, eMBB
  • ultra-reliable low-latency communications URLLC
  • massive machine-type communications mMTC
  • numerology support multiple subcarrier interval operation, etc.
  • dynamic operation of slot format initial access technology to support multi-beam transmission and broadband
  • definition and operation of BWP Band-Width Part
  • New channel coding methods such as LDPC (Low Density Parity Check) codes for data transmission and Polar Code for highly reliable transmission of control information
  • L2 pre-processing L2 pre-processing
  • dedicated services specialized for specific services. Standardization of network slicing, etc., which provides networks, has been carried out.
  • V2X Vehicle-to-Everything
  • NR-U New Radio Unlicensed
  • UE Power Saving NR terminal low power consumption technology
  • NTN Non-Terrestrial Network
  • IAB provides a node for expanding the network service area by integrating intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, and wireless backhaul links and access links.
  • Intelligent factories Intelligent Internet of Things, IIoT
  • Mobility Enhancement including Conditional Handover and DAPS (Dual Active Protocol Stack) handover
  • 2-step Random Access (2-step RACH for simplification of random access procedures)
  • Standardization in the field of wireless interface architecture/protocol for technologies such as NR is also in progress
  • 5G baseline for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technology Standardization in the field of system architecture/services for architecture (e.g., Service based Architecture, Service based Interface) and Mobile Edge Computing (MEC), which provides services based on the location of the terminal, is also in progress.
  • NFV Network Functions Virtualization
  • SDN Software-Defined Networking
  • FD-MIMO full dimensional MIMO
  • array antennas to ensure coverage in the terahertz band of 6G mobile communication technology.
  • multi-antenna transmission technology such as Large Scale Antenna, metamaterial-based lens and antenna to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum), RIS ( In addition to Reconfigurable Intelligent Surface technology, Full Duplex technology, satellite, and AI (Artificial Intelligence) to improve the frequency efficiency of 6G mobile communication technology and system network are utilized from the design stage and end-to-end.
  • the disclosed embodiment seeks to provide an apparatus and method that can effectively provide services in a wireless communication system.
  • the object is to provide a method and device for setting a beam for transmission and reception of a physical channel/signal in a wireless communication system in which multiple transmission reception points (TRPs) operate.
  • TRPs transmission reception points
  • an embodiment of the present disclosure provides a method performed by a terminal in a wireless communication system.
  • the method includes receiving configuration information related to a control resource set (CORESET), the configuration information including a CORESET group identifier corresponding to each CORESET; identifying a first CORESET associated with a first CORESET group and a second CORESET associated with a second CORESET group based on the CORESET group identifier; Based on either the first CORESET or the second CORESET, receiving downlink control information (DCI) including a Transmission Configuration Indicator (TCI) field; And when the codepoint of the TCI field corresponds to a plurality of TCI states, the first TCI state among the plurality of TCI states is applied to the channel associated with the first CORESET, and the second TCI state is applied to the channel associated with the first CORESET. and applying a state to a channel associated with the second CORESET.
  • DCI downlink control information
  • TCI Transmission Configuration Indicator
  • an embodiment of the present disclosure provides a method performed by a base station in a wireless communication system.
  • the method includes transmitting setting information related to CORESET to a terminal, wherein the setting information includes a CORESET group identifier corresponding to each CORESET, and a first CORESET group and a first CORESET are associated based on the CORESET group identifier, and A second CORESET group and a second CORESET are associated; And based on one of the first CORESET or the second CORESET, transmitting a DCI including a TCI field to the terminal, wherein the codepoint of the TCI field is set to correspond to a plurality of TCI states.
  • the first TCI state among the plurality of TCI states may be applied to the channel associated with the first CORESET and the second TCI state may be applied to the channel associated with the second CORESET.
  • an embodiment of the present disclosure provides a terminal operating in a wireless communication system.
  • the terminal includes a transmitter and receiver that transmits and receives signals; and a control unit functionally connected to the transceiver unit, wherein the control unit receives setting information related to CORESET, wherein the setting information includes a CORESET group identifier corresponding to each CORESET, and based on the CORESET group identifier.
  • the base station includes a transceiver unit that transmits and receives signals; and a control unit functionally connected to the transceiver, wherein the control unit transmits setting information related to CORESET to the terminal, wherein the setting information includes a CORESET group identifier corresponding to each CORESET, and the CORESET group identifier. Based on this, a first CORESET group and a first CORESET are associated and a second CORESET group and a second CORESET are associated, and based on either the first CORESET or the second CORESET, a DCI including a TCI field.
  • the terminal It is set to transmit to the terminal, and when the code point of the TCI field is set to correspond to a plurality of TCI states, the first TCI state among the plurality of TCI states is applied to the channel associated with the first CORESET A second TCI state may be applied to the channel associated with the second CORESET.
  • signaling overhead required to set up/update a beam for transmitting and receiving a physical channel/signal can be reduced.
  • the time required for beam setup/update can be reduced by setting beam information (e.g., TCI state) for uplink and downlink in an integrated form.
  • beam information e.g., TCI state
  • the TCI state can be set for each CORESET and/or search space (set).
  • FIG. 1 is a diagram illustrating the basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 3 is a diagram illustrating an example of bandwidth portion setting in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating an example of control area setting of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 6 is a diagram illustrating through Span a case in which a terminal may have multiple PDCCH monitoring positions within a slot in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 7 is a diagram illustrating an example of base station beam allocation according to TCI state settings in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 8 is a diagram illustrating an example of a TCI state allocation method for PDCCH in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram illustrating a TCI indication MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 10 is a diagram illustrating an example of beam settings of a control resource set and search space in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 11 is a diagram illustrating a method for a terminal to select a set of control resources that can be received in consideration of priority when receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
  • Figure 12 shows a process for beam setting and activation of a PDSCH according to an embodiment of the present disclosure.
  • FIG. 13 is a diagram illustrating an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 14 is a diagram illustrating an example of downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
  • DCI downlink control information
  • Figure 15 is a diagram showing the Enhanced PDSCH TCI state activation/deactivation MAC-CE structure according to an embodiment of the present disclosure.
  • Figure 16 shows an example of applying/setting the TCI state to CORESET and search space (set) according to an embodiment of the present disclosure.
  • Figure 17 shows an example of applying/setting a TCI state to a PDCCH when a CORESET group is set according to an embodiment of the present disclosure.
  • Figure 18 shows an example to explain a method of applying TCI state to PDCCH received in CORESETs with different CORESET group IDs set according to an embodiment of the present disclosure.
  • Figure 19 shows an example of a signaling flowchart of a terminal and a base station according to an embodiment of the present disclosure.
  • Figure 20 is a diagram showing the structure of a MAC CE message using reserved bits according to an embodiment of the present invention.
  • Figure 21 is a diagram showing the structure of an expanded MAC CE message according to an embodiment of the present invention.
  • FIG. 22 is a diagram illustrating an example to explain a method of applying TCI state in the case of single DCI-based multi-TRP transmission according to an embodiment of the present invention.
  • FIG. 23 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 24 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • the base station is the entity that performs resource allocation for the terminal and may be at least one of gNode B, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or node on the network.
  • a terminal may include a UE (User Equipment), MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions.
  • DL downlink
  • MS Mobile Station
  • UL uplink
  • LTE or LTE-A system may be described below as an example, embodiments of the present disclosure can also be applied to other communication systems with similar technical background or channel types.
  • this may include the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A, and the term 5G hereinafter may also include the existing LTE, LTE-A, and other similar services.
  • 5G new radio
  • this disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure at the discretion of a person with skilled technical knowledge.
  • each block of the processing flow diagrams and combinations of the flow diagram diagrams can be performed by computer program instructions.
  • These computer program instructions can be mounted on a processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, so that the instructions performed through the processor of the computer or other programmable data processing equipment are described in the flow chart block(s). It creates the means to perform functions.
  • These computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular manner, so that the computer-usable or computer-readable memory
  • the instructions stored in may also produce manufactured items containing instruction means that perform the functions described in the flow diagram block(s).
  • Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing the functions described in the flow diagram block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s).
  • the term ' ⁇ unit' used in this embodiment refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles. do.
  • ' ⁇ part' is not limited to software or hardware.
  • the ' ⁇ part' may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors. Therefore, as an example, ' ⁇ part' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'. Additionally, components and 'parts' may be implemented to regenerate one or more CPUs within a device or a secure multimedia card. Additionally, in an embodiment, ' ⁇ part' may include one or more processors.
  • Wireless communication systems have moved away from providing early voice-oriented services to, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), and LTE-Advanced.
  • Broadband wireless that provides high-speed, high-quality packet data services such as communication standards such as (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is evolving into a communication system.
  • the LTE system adopts Orthogonal Frequency Division Multiplexing (OFDM) in the downlink (DL), and Single Carrier Frequency Division Multiplexing (SC-FDMA) in the uplink (UL).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiplexing
  • Uplink refers to a wireless link through which a terminal (UE (User Equipment) or MS (Mobile Station)) transmits data or control signals to a base station (eNode B, or base station (BS)), and downlink refers to a wireless link where the base station transmits data or control signals to the base station (eNode B, or base station (BS)). It refers to a wireless link that transmits data or control signals.
  • the above multiple access method usually distinguishes each user's data or control information by allocating and operating the time-frequency resources to carry data or control information for each user so that they do not overlap, that is, orthogonality is established. You can.
  • the 5G communication system must be able to freely reflect the various requirements of users and service providers, so services that simultaneously satisfy various requirements must be supported.
  • Services considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). There is.
  • eMBB aims to provide more improved data transmission speeds than those supported by existing LTE, LTE-A or LTE-Pro.
  • eMBB in a 5G communication system, eMBB must be able to provide a peak data rate of 20Gbps in the downlink and 10Gbps in the uplink from the perspective of one base station.
  • the 5G communication system must provide the maximum transmission rate and at the same time provide increased user perceived data rate.
  • improvements in various transmission and reception technologies are required, including more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology.
  • MIMO Multi Input Multi Output
  • the 5G communication system uses a frequency bandwidth wider than 20MHz in the 3 ⁇ 6GHz or above 6GHz frequency band to transmit the data required by the 5G communication system. Transmission speed can be satisfied.
  • mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems.
  • IoT Internet of Things
  • mMTC requires support for access to a large number of terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal costs.
  • the Internet of Things provides communication functions by attaching various sensors and various devices, it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell.
  • terminals supporting mMTC are likely to be located in shaded areas that cannot be covered by cells, such as the basement of a building, so they may require wider coverage than other services provided by the 5G communication system.
  • Terminals that support mMTC must be composed of low-cost terminals, and since it is difficult to frequently replace the terminal's battery, a very long battery life time, such as 10 to 15 years, may be required.
  • URLLC is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency situations. Services used for emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service that supports URLLC must satisfy an air interface latency of less than 0.5 milliseconds and has a packet error rate of less than 10 -5 . Therefore, for services that support URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, a design that requires allocating wide resources in the frequency band to ensure the reliability of the communication link. Specifications may be required.
  • TTI Transmit Time Interval
  • the three 5G services namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. At this time, different transmission/reception techniques and transmission/reception parameters can be used between services to satisfy the different requirements of each service.
  • 5G is not limited to the three services mentioned above.
  • Figure 1 is a diagram showing the basic structure of the time-frequency domain, which is a radio resource domain where data or control channels are transmitted in the 5G system.
  • the horizontal axis in Figure 1 represents the time domain, and the vertical axis represents the frequency domain.
  • the basic unit of resources in the time and frequency domains is a resource element (RE) 101, which is defined as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. It can be. in the frequency domain (For example, 12) consecutive REs may constitute one resource block (Resource Block, RB, 104).
  • RE resource element
  • RB Resource Block
  • FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 2 shows an example of a frame 200, subframe 201, and slot 202 structure.
  • 1 frame (200) can be defined as 10ms.
  • 1 subframe 201 may be defined as 1 ms, and therefore 1 frame 200 may consist of a total of 10 subframes 201.
  • 1 subframe 201 may be composed of one or a plurality of slots 202, 203, and the number of slots 202, 203 per 1 subframe 201 is set to the subcarrier spacing ⁇ (204, 205). ) may vary depending on the condition. In an example of FIG.
  • bandwidth part (BWP) settings in the 5G communication system will be described in detail with reference to the drawings.
  • FIG. 3 is a diagram illustrating an example of bandwidth portion setting in a wireless communication system according to an embodiment of the present disclosure.
  • Figure 3 shows an example in which the UE bandwidth 300 is set to two bandwidth parts, that is, bandwidth part #1 (BWP#1) 301 and bandwidth part #2 (BWP#2) 302. It shows.
  • the base station can set one or more bandwidth parts to the terminal, and can set the following information for each bandwidth part.
  • various parameters related to the bandwidth can be set to the terminal.
  • the above information can be delivered from the base station to the terminal through higher layer signaling, for example, Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • at least one bandwidth portion may be activated. Whether to activate the set bandwidth portion can be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through DCI (Downlink Control Information).
  • DCI Downlink Control Information
  • the terminal before RRC (Radio Resource Control) connection may receive the initial bandwidth portion (Initial BWP) for initial connection from the base station through a MIB (Master Information Block).
  • the terminal may transmit a PDCCH for receiving system information (which may correspond to Remaining System Information; RMSI or System Information Block 1; SIB1) required for initial connection through the MIB in the initial connection stage.
  • RMSI Remaining System Information
  • SIB1 System Information Block 1
  • the control area and search space set as MIB can each be regarded as identifier (ID) 0.
  • the base station can notify the terminal of setting information such as frequency allocation information, time allocation information, and numerology for control area #0 through the MIB.
  • the base station can notify the terminal of setting information about the monitoring period and occasion for control area #0, that is, setting information about search space #0, through the MIB.
  • the terminal may regard the frequency area set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access.
  • the identifier (ID) of the initial bandwidth portion can be regarded as 0.
  • the base station sets the frequency location (setting information 2) of the bandwidth portion to the terminal, allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.
  • the base station may set a plurality of bandwidth portions to the terminal for the purpose of supporting different numerologies. For example, in order to support both data transmission and reception using a subcarrier spacing of 15kHz and a subcarrier spacing of 30kHz for a certain terminal, the two bandwidth portions can be set to subcarrier spacings of 15kHz and 30kHz, respectively. Different bandwidth portions can be frequency division multiplexed, and when data is to be transmitted and received at a specific subcarrier interval, the bandwidth portion set at the subcarrier interval can be activated.
  • the base station may set bandwidth portions with different sizes of bandwidth to the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and always transmits and receives data through that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels with a large bandwidth of 100 MHz in a situation where there is no traffic can be very inefficient in terms of power consumption.
  • the base station may set a relatively small bandwidth portion of the terminal, for example, a bandwidth portion of 20 MHz. 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, data can be transmitted and received in the 100 MHz bandwidth portion according to the instructions of the base station.
  • terminals before RRC connection can receive configuration information for the initial bandwidth part through a Master Information Block (MIB) in the initial connection stage.
  • MIB Master Information Block
  • the terminal has a control area (Control Resource Set, CORESET) can be set.
  • the bandwidth of the control area set as MIB can be considered as the initial bandwidth part, and through the set initial bandwidth part, the terminal can receive the PDSCH (Physical Downlink Shared Channel) through which the SIB is transmitted.
  • the initial bandwidth portion can also be used for other system information (OSI), paging, and random access.
  • OSI system information
  • the base station may instruct the terminal to change (or switch, transition) the bandwidth portion using the Bandwidth Part Indicator field in the DCI.
  • the base station may indicate bandwidth portion #2 (302) to the terminal as a bandwidth portion indicator in the DCI, and the terminal may indicate the received bandwidth portion #2 (302).
  • Bandwidth part change can be performed using bandwidth part #2 (302) indicated by the bandwidth part indicator in DCI.
  • the DCI-based bandwidth portion change can be indicated by the DCI scheduling the PDSCH or PUSCH
  • the PDSCH or PUSCH scheduled by the corresponding DCI may be unreasonable in the changed bandwidth portion. It must be possible to perform reception or transmission without it.
  • the standard stipulates requirements for the delay time (T BWP ) required when changing the bandwidth portion, and can be defined, for example, as follows.
  • the terminal can report the supportable bandwidth portion delay time type to the base station.
  • the terminal when the terminal receives a DCI including a bandwidth portion change indicator in slot n, the terminal changes to the new bandwidth portion indicated by the bandwidth portion change indicator in slot n+ It can be completed no later than T BWP , and transmission and reception on the data channel scheduled by the relevant DCI can be performed in the new changed bandwidth portion.
  • the base station wants to schedule a data channel with a new bandwidth portion, it can determine time domain resource allocation for the data channel by considering the bandwidth portion change delay time (T BWP ) of the terminal. That is, when scheduling a data channel with a new bandwidth portion, the base station can schedule the data channel after the bandwidth portion change delay time in determining time domain resource allocation for the data channel. Accordingly, the terminal may not expect that the DCI indicating a bandwidth portion change indicates a slot offset (K0 or K2) value that is smaller than the bandwidth portion change delay time (T BWP ).
  • the terminal If the terminal receives a DCI indicating a change in the bandwidth portion (for example, DCI format 1_1 or 0_1), the terminal transmits the time domain resource allocation indicator field within the DCI from the third symbol of the slot in which the PDCCH including the corresponding DCI was received. No transmission or reception may be performed during the time interval corresponding to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by .
  • a DCI indicating a change in the bandwidth portion for example, DCI format 1_1 or 0_1
  • the terminal transmits the time domain resource allocation indicator field within the DCI from the third symbol of the slot in which the PDCCH including the corresponding DCI was received. No transmission or reception may be performed during the time interval corresponding to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by .
  • the terminal receives a DCI indicating a change in the bandwidth portion in slot n, and the slot offset value indicated by the corresponding DCI is K, the terminal starts from the third symbol of slot n to the symbols before slot n+K (i.e., slot No transmission or reception may be performed until the last symbol of n+K-1.
  • SS/PBCH block may refer to a physical layer channel block consisting of Primary SS (PSS), Secondary SS (SSS), and PBCH. Specifically, it is as follows.
  • - PSS A signal that serves as a standard for downlink time/frequency synchronization and provides some information about the cell ID.
  • - SSS It is the standard for downlink time/frequency synchronization and provides the remaining cell ID information not provided by PSS. Additionally, it can serve as a reference signal for demodulation of PBCH.
  • Essential system information may include search space-related control information indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, etc.
  • SS/PBCH block consists of a combination of PSS, SSS, and PBCH.
  • One or more SS/PBCH blocks can be transmitted within 5ms, and each transmitted SS/PBCH block can be distinguished by an index.
  • the terminal can detect PSS and SSS in the initial access stage and decode the PBCH.
  • the MIB can be obtained from the PBCH, and the control area (Control Resource Set; CORESET) #0 (which may correspond to a control area with a control area index of 0) can be set from this.
  • the terminal can perform monitoring on control area #0 assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted in control area #0 are QCL (Quasi Co Location).
  • the terminal can receive system information through downlink control information transmitted from control area #0.
  • the terminal can obtain RACH (Random Access Channel)-related configuration information necessary for initial access from the received system information.
  • RACH Random Access Channel
  • the terminal can transmit PRACH (Physical RACH) to the base station in consideration of the SS/PBCH index selected, and the base station receiving the PRACH can obtain information about the SS/PBCH block index selected by the terminal.
  • the base station can know which block the terminal has selected among each SS/PBCH block and monitor the control area #0 associated with it.
  • DCI downlink control information
  • scheduling information for uplink data (or Physical Uplink Shared Channel, PUSCH) or downlink data (or Physical Downlink Shared Channel, PDSCH) is transmitted through DCI. It is transmitted from the base station to the terminal.
  • the terminal can monitor the DCI format for fallback and the DCI format for non-fallback for PUSCH or PDSCH.
  • the countermeasure DCI format may consist of fixed fields predefined between the base station and the terminal, and the countermeasure DCI format may include configurable fields.
  • DCI can be transmitted through PDCCH (Physical Downlink Control Channel), a physical downlink control channel, through channel coding and modulation processes.
  • a CRC Cyclic Redundancy Check
  • RNTI Radio Network Temporary Identifier
  • Different RNTIs may be used depending on the purpose of the DCI message, for example, UE-specific data transmission, power control command, or random access response. In other words, the RNTI is not transmitted explicitly but is transmitted included in the CRC calculation process.
  • the terminal checks the CRC using the allocated RNTI, and if the CRC check result is correct, the terminal can know that the message was sent to the terminal.
  • DCI scheduling PDSCH for system information may be scrambled with SI-RNTI.
  • the DCI that schedules the PDSCH for a Random Access Response (RAR) message can be scrambled with RA-RNTI.
  • DCI scheduling PDSCH for paging messages can be scrambled with P-RNTI.
  • DCI notifying SFI Slot Format Indicator
  • DCI notifying TPC Transmit Power Control
  • TPC-RNTI Transmission Power Control
  • the DCI scheduling the UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).
  • DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, and at this time, CRC can be scrambled with C-RNTI.
  • DCI format 0_0, in which the CRC is scrambled with C-RNTI, may include, for example, the following information.
  • DCI format 0_1 can be used as a fallback DCI for scheduling PUSCH, and at this time, CRC can be scrambled with C-RNTI.
  • DCI format 0_1, in which the CRC is scrambled with C-RNTI, may include, for example, the following information.
  • DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and at this time, CRC can be scrambled with C-RNTI.
  • DCI format 1_0, in which the CRC is scrambled with C-RNTI, may include, for example, the following information.
  • DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, and at this time, CRC can be scrambled with C-RNTI.
  • DCI format 1_1, in which the CRC is scrambled with C-RNTI, may include, for example, the following information.
  • FIG. 4 is a diagram illustrating an example of a control area (Control Resource Set, CORESET) where a downlink control channel is transmitted in a 5G wireless communication system.
  • Figure 4 shows the UE bandwidth part 410 on the frequency axis and two control areas (control area #1 (401), control area #2 (402)) within one slot (420) on the time axis.
  • the control areas 401 and 402 can be set to a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis.
  • the time axis can be set to one or multiple OFDM symbols and can be defined as the control region length (Control Resource Set Duration, 404). Referring to the example shown in FIG. 4, control area #1 (401) is set to a control area length of 2 symbols, and control area #2 (402) is set to a control area length of 1 symbol.
  • the control area in 5G described above can be set by the base station to the terminal through higher layer signaling (e.g., system information, master information block (MIB), and radio resource control (RRC) signaling).
  • Setting a control area to a terminal means providing information such as the control area identifier (Identity), the frequency location of the control area, and the symbol length of the control area. For example, it may include the following information.
  • the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information is one or more SS (Synchronization Signals) in a QCL (Quasi Co Located) relationship with the DMRS transmitted from the corresponding control area.
  • SS Synchronization Signals
  • QCL Quadrature Co Located
  • PBCH Physical Broadcast Channel
  • CSI-RS Channel State Information Reference Signal
  • Figure 5 is a diagram showing an example of the basic units of time and frequency resources that make up a downlink control channel that can be used in 5G.
  • the basic unit of time and frequency resources constituting the control channel can be called REG (Resource Element Group, 503), and REG (503) is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis.
  • REG Resource Element Group
  • 503 is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis.
  • Physical Resource Block, 502 Physical Resource Block
  • the base station can configure a downlink control channel allocation unit by concatenating REGs 503.
  • 1 CCE 504 may be composed of a plurality of REGs 503. Taking REG 503 shown in FIG. 5 as an example, REG 503 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 may consist of 72 REs.
  • the area can be composed of a plurality of CCEs (504), and a specific downlink control channel is composed of one or multiple CCEs (504) depending on the aggregation level (AL) within the control area. It can be mapped and transmitted.
  • CCEs 504 in the control area are classified by numbers, and at this time, the numbers of CCEs 504 can be assigned according to a logical mapping method.
  • the basic unit of the downlink control channel shown in FIG. 5, that is, REG 503, may include both REs to which DCI is mapped and an area to which DMRS 505, a reference signal for decoding the same, is mapped.
  • three DMRSs 505 can be transmitted within 1 REG 503.
  • 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.
  • the search space is a set of downlink control channel candidates consisting of CCEs that the terminal must attempt to decode on a given aggregation level, and various aggregations that make one bundle of 1, 2, 4, 8, or 16 CCEs. Because there are levels, the terminal can have multiple search spaces.
  • a search space set can be defined as a set of search spaces at all set aggregation levels.
  • Search space can be classified into common search space and UE-specific search space.
  • 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 or paging messages for system information.
  • cell common control information such as dynamic scheduling or paging messages for system information.
  • PDSCH scheduling allocation information for SIB transmission can be received by examining the common search space of the PDCCH.
  • a certain group of UEs or all UEs must receive the PDCCH, so it can be defined as a set of pre-arranged CCEs.
  • Scheduling allocation information for a UE-specific PDSCH or PUSCH can be received by examining the UE-specific search space of the PDCCH.
  • the terminal-specific search space can be terminal-specifically defined as a function of the terminal's identity and various system parameters.
  • parameters for the search space for PDCCH can be set from the base station to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling).
  • the base station monitors 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 UE-specific search space),
  • the combination of the DCI format and RNTI to be monitored in the search space, the control area index to be monitored in the search space, etc. can be set to the terminal. For example, it may include the following information.
  • the base station can configure one or more search space sets for the terminal.
  • the base station may configure search space set 1 and search space set 2 for the terminal, and may configure DCI format A scrambled with X-RNTI in search space set 1 to be monitored in the common search space, and search In space set 2, DCI format B scrambled with Y-RNTI can be set to be monitored in the terminal-specific search space.
  • one or multiple search space sets may exist in the common search space or the terminal-specific search space.
  • search space set #1 and search space set #2 may be set as common search spaces
  • search space set #3 and search space set #4 may be set as terminal-specific search spaces.
  • the combination of the following DCI format and RNTI can be monitored.
  • this is not limited to the examples below.
  • the specified RNTIs may follow the definitions and uses below.
  • C-RNTI Cell RNTI
  • TC-RNTI Temporal Cell RNTI
  • CS-RNTI Configured Scheduling RNTI
  • RA-RNTI Random Access RNTI
  • P-RNTI Paging RNTI
  • SI-RNTI System Information RNTI
  • INT-RNTI Used to inform whether or not the PDSCH is pucturing.
  • TPC-PUSCH-RNTI Transmit Power Control for PUSCH RNTI
  • TPC-PUCCH-RNTI Transmit Power Control for PUCCH RNTI
  • TPC-SRS-RNTI Transmit Power Control for SRS RNTI
  • the search space of the aggregation level L in the control area p and search space set s can be expressed as Equation 1 below.
  • the value may correspond to 0 in the case of a common search space.
  • the value may correspond to a value that changes depending on the UE's identity (C-RNTI or ID set to the UE by the base station) and time index.
  • search space set #1 is set to an X-slot period
  • search space set #2 is set to a Y-slot period
  • Both space set #2 can be monitored, and in a specific slot, either search space set #1 or search space set #2 can be monitored.
  • the UE can perform UE capability reporting at each subcarrier interval for cases where it has multiple PDCCH monitoring positions within a slot, and in this case, the concept of Span can be used.
  • Span refers to consecutive symbols through which the UE can monitor the PDCCH within a slot, and each PDCCH monitoring position is within one Span.
  • Span can be expressed as (X,Y), where x refers to the minimum number of symbols that must be separated between the first symbols of two consecutive spans, and Y is the number of consecutive symbols that can monitor the PDCCH within one span. says At this time, the terminal can monitor the PDCCH within the span from the first symbol of the span to the Y symbol.
  • FIG. 6 is a diagram illustrating through Span a case in which a terminal may have multiple PDCCH monitoring positions within a slot in a wireless communication system according to an embodiment of the present disclosure.
  • (5-1-00) represents the case where two spans that can be expressed as (7,4) exist within the slot.
  • the interval between the first symbols of two spans is expressed as indicates the presence of each.
  • (5-1-05) expresses the case where a total of three spans that can be expressed as (4,3) exist within the slot, and the interval between the second and third spans is greater than Large
  • the slot location where the above-mentioned common search space and terminal-specific search space are located is indicated by the monitoringSymbolsWitninSlot parameter in Table 11-1, and the symbol position within the slot is indicated as a bitmap through the monitoringSymbolsWithinSlot parameter in Table 9. Meanwhile, the symbol position within the slot where the UE can monitor the search space can be reported to the base station through the following UE capabilities.
  • This terminal capability is as shown in Table 11-1 below, if there is one monitoring location (MO: monitoring occasion) for the type 1 and type 3 common search space or terminal-specific search space in the slot, the corresponding MO location is in the slot. When located within the first 3 symbols, it means the ability to monitor the corresponding MO.
  • This terminal capability is a mandatory capability that all terminals that support NR must support, and whether or not this capability is supported is not explicitly reported to the base station.
  • This terminal capability is as shown in Table 11-2 below, if there is one monitoring location (MO: monitoring occasion) for the common search space or terminal-specific search space in the slot, regardless of where the start symbol location of the MO is. This refers to capabilities that can be monitored. This terminal capability can be optionally supported by the terminal, and whether or not this capability is supported is explicitly reported to the base station.
  • MO monitoring location
  • FG 3-2 Terminal Capability 2
  • This terminal capability indicates the pattern of MO that the terminal can monitor when there are multiple monitoring occasions (MOs) in the slot for the common search space or the terminal-specific search space, as shown in Table 11-3 below. do.
  • the above-described pattern consists of the start inter-symbol spacing X between different MOs, and the maximum symbol length Y for one MO.
  • the combination of (X,Y) supported by the terminal may be one or more of ⁇ (2,2), (4,3), (7,3) ⁇ .
  • This terminal capability can be optionally supported by the terminal, and whether or not this capability is supported and the above-mentioned (X, Y) combination are explicitly reported to the base station.
  • the terminal may report whether it supports the above-described terminal capability 2 and/or terminal capability 3 and related parameters to the base station.
  • the base station can perform time axis resource allocation for the common search space and UE-specific search space based on the reported UE capabilities. When allocating the resources, the base station can prevent the UE from locating the MO in a location that cannot be monitored.
  • the following conditions can be considered in determining the search space set that the terminal should monitor.
  • the terminal can determine the number of PDCCH candidates that can be monitored and the entire search space (here, the entire search space is the union area of a plurality of search space sets).
  • the maximum value for the number of CCEs constituting the entire CCE set (meaning the entire CCE set) is defined for each slot, and if the value of monitoringCapabilityConfig-r16 is set to r16monitoringcapability, the terminal determines the number of PDCCH candidates that can be monitored and the total search space (
  • the maximum value for the number of CCEs constituting the entire search space (meaning the entire set of CCEs corresponding to the union area of multiple search space sets) is defined for each span.
  • M ⁇ the maximum number of PDCCH candidates that the UE can monitor, is defined on a slot basis in a cell with a subcarrier spacing of 15 ⁇ 2 ⁇ kHz, Table 12-1 below. If defined on a Span basis, Table 12-2 below can be followed.
  • the maximum number of CCEs constituting the entire search space (here, the entire search space means the entire set of CCEs corresponding to the union area of a plurality of search space sets) is is the subcarrier spacing
  • Table 12-3 below can be followed, and when defined on a Span basis, Table 12-4 below can be followed.
  • condition A a situation in which both conditions 1 and 2 above are satisfied at a specific point in time will be defined as “condition A.” Therefore, not satisfying condition A may mean not satisfying at least one of conditions 1 and 2 above.
  • condition A may not be satisfied at a specific point in time. If condition A is not satisfied at a specific point in time, the terminal can select and monitor only some of the search space sets set to satisfy condition A at that point in time, and the base station can transmit the PDCCH to the selected search space set.
  • the following method can be followed to select some search spaces from the entire set of search spaces.
  • condition A for PDCCH is not satisfied at a specific time point (slot)
  • the terminal or the base station selects a search space set whose search space type is set to common search space among the search space sets that exist at that time point to the terminal. -You can select a specific search space over a set of search spaces set as a specific search space.
  • the terminal uses the terminal-specific search space. You can select search space sets that are set to . At this time, if there are multiple search space sets set as terminal-specific search spaces, a search space set with a lower search space set index may have higher priority. Considering priority, terminal-specific search space sets can be selected within the range where condition A is satisfied.
  • one or more different antenna ports (or one or more channels, signals, and combinations thereof may be replaced, but in the future description of the present disclosure, they will be collectively referred to as different antenna ports for convenience) They can be associated with each other by QCL (Quasi co-location) settings as shown in [Table 13] below.
  • the TCI state is to announce the QCL relationship between PDCCH (or PDCCH DMRS) and other RS or channels, and the QCL relationship between a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) QCLed means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at antenna port A to channel measurement from antenna port B.
  • QCL is based on 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) RRM (radio resource management) affected by average gain, and 4) spatial parameter.
  • RRM radio resource management
  • BM beam management
  • NR supports four types of QCL relationships as shown in Table 13 below.
  • the spatial RX parameter is 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, spatial channel correlation, etc. Some or all of them can be collectively referred to.
  • AoA Angle of arrival
  • PAS Power Angular Spectrum
  • AoD Angle of departure
  • PAS PAS of AoD
  • transmit/receive channel correlation transmit/receive beamforming
  • spatial channel correlation etc.
  • the QCL relationship can be set to the terminal through RRC parameters TCI-State and QCL-Info as shown in Table 14 below.
  • the base station can set one or more TCI states to the UE and inform the UE of up to two QCL relationships (qcl-Type1, qcl-Type2) for the RS referring to the ID of the TCI state, that is, the target RS.
  • each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 13 above. do.
  • FIG. 7 is a diagram illustrating an example of base station beam allocation according to TCI state settings according to an embodiment of the present disclosure.
  • the base station can transmit information about N different beams to the terminal through N different TCI states.
  • N 3 as shown in Figure 7
  • the base station is associated with CSI-RS or SSB corresponding to beams with different qcl-Type2 parameters included in the three TCI states (700, 705, 710), and QCL type D
  • the antenna ports referring to the different TCI states 700, 705, or 710 are associated with different spatial Rx parameters, for example, different beams.
  • Tables 15-1 to 15-5 below disclose valid TCI state settings according to target antenna port type.
  • Table 15-1 shows valid TCI state settings when the target antenna port is CSI-RS for tracking (TRS).
  • TRS refers to an NZP CSI-RS in which the repetition parameter among CSI-RSs is not set and trs-Info is set to true.
  • Setting number 3 in Table 15-1 can be used for aperiodic TRS.
  • Table 15-2 shows valid TCI state settings when the target antenna port is 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) among CSI-RSs is not set and trs-Info is also not set to true.
  • Table 15-3 shows valid TCI state settings when the target antenna port is CSI-RS for beam management (BM, 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 among CSI-RSs is set and has a value of On or Off, and trs-Info is not set to true.
  • Table 15-4 shows valid TCI state settings when the target antenna port is PDCCH DMRS.
  • Table 15-5 shows valid TCI state settings when the target antenna port is PDSCH DMRS.
  • the representative QCL setting method according to Tables 15-1 to 15-5 above changes the target antenna port and reference antenna port for each step from "SSB” -> "TRS” -> "CSI-RS for CSI, or CSI-RS for BM. , or PDCCH DMRS, or PDSCH DMRS”. Through this, it is possible to assist the terminal's reception operation by linking the statistical characteristics that can be measured from SSB and TRS to each antenna port.
  • TCI state combinations applicable to the PDCCH DMRS antenna port are shown in Table 16 below.
  • the fourth row in Table 16 is the combination assumed by the terminal before RRC setting, and setting after RRC is not possible.
  • FIG. 8 is a diagram illustrating an example of a TCI state allocation method for PDCCH in a wireless communication system according to an embodiment of the present disclosure.
  • the base station can set N TCI states (805, 810, ..., 820) to the terminal through RRC signaling 800, and some of these can be set as TCI states for CORESET. (825). Afterwards, the base station may indicate one of the TCI states (830, 835, 840) for CORESET to the UE through MAC CE signaling (845). Afterwards, the terminal receives the PDCCH based on the beam information included in the TCI state indicated by the MAC CE signaling.
  • FIG. 9 is a diagram illustrating a TCI indication MAC CE signaling structure for PDCCH DMRS according to an embodiment of the present disclosure.
  • the TCI indication MAC CE signaling for the PDCCH DMRS consists of 2 bytes (16 bits) (e.g., Oct 1 (900), Oct 2 (905)) and a 5-bit serving cell ID (915). , 4 bits of CORESET ID (920) and 7 bits of TCI state ID (925).
  • FIG. 10 is a diagram illustrating an example of beam settings of a control resource set (CORESET) and a search space according to an embodiment of the present disclosure.
  • CORESET control resource set
  • the base station may indicate one of the TCI state lists included in the CORESET (1000) configuration through MAC CE signaling (1005). Afterwards, until another TCI state is indicated to the corresponding CORESET through another MAC CE signaling, the terminal provides the same QCL information (beam #1, 1005) in one or more search spaces (1010, 1015, 1020) connected to the CORESET. is considered to apply.
  • the PDCCH beam allocation method described above is difficult to indicate a beam change faster than the MAC CE signaling delay, and also has the disadvantage of applying the same beam to each CORESET regardless of search space characteristics, making flexible PDCCH beam operation difficult. There is.
  • the following embodiments of the present invention provide a more flexible PDCCH beam setting and operation method.
  • several distinct examples are provided for convenience of explanation, but these are not mutually exclusive and can be applied in appropriate combination with each other depending on the situation.
  • the base station can set one or more TCI states for a specific control area to the terminal, and can activate one of the set TCI states through a MAC CE activation command. For example, ⁇ TCI state#0, TCI state#1, TCI state#2 ⁇ is set as the TCI state in control area #1, and the base station sets the TCI state as the TCI state for control area #1 through MAC CE.
  • a command to activate to assume #0 can be sent to the terminal.
  • the terminal can correctly receive the DMRS of the corresponding control area based on the activation command for the TCI state received through MAC CE and the QCL information in the activated TCI state.
  • control area #0 For the control area (control area #0) whose index is set to 0, if the terminal does not receive the MAC CE activation command for the TCI state of control area #0, the terminal responds to the DMRS transmitted from control area #0. It can be assumed that it is QCLed with the SS/PBCH block identified during the initial access process or a non-contention-based random access process that is not triggered by a PDCCH command.
  • control area #X For a control area (control area #X) whose index is set to a value other than 0, if the terminal has not received a TCI state for control area # If the MAC CE activation command is not received, the terminal can assume that the DMRS transmitted in control area #X has been QCLed with the SS/PBCH block identified during the initial access process.
  • the terminal operates in a single cell or intra-band carrier aggregation, and multiple control resource sets that exist within the activated bandwidth portion of a single or multiple cells have the same or different QCL-TypeD characteristics in a specific PDCCH monitoring period and are synchronized in time.
  • the terminal can select a specific control resource set according to the QCL priority determination operation and monitor control resource sets that have the same QCL-TypeD characteristics as the corresponding control resource set. For example, when multiple control resource sets overlap in time, only one QCL-TypeD characteristic can be received.
  • the criteria for determining QCL priority may be as follows.
  • the terminal may additionally consider the following two matters regarding the QCL information set in the control resource set. First, if control resource set 1 has CSI-RS 1 as a reference signal with a QCL-TypeD relationship, and the reference signal that this CSI-RS 1 has a QCL-TypeD relationship with is SSB 1, and another If the reference signal with which control resource set 2 has a QCL-TypeD relationship is SSB 1, the terminal can consider these two control resource sets 1 and 2 as having different QCL-TypeD characteristics.
  • control resource set 1 has CSI-RS 1 set in Cell 1 as a reference signal with a relationship of QCL-TypeD
  • this CSI-RS 1 is a reference signal with a relationship of QCL-TypeD
  • control resource set 2 has CSI-RS 2 set in cell 2 as a reference signal with a QCL-TypeD relationship
  • the reference signal that this CSI-RS 2 has a QCL-TypeD relationship is the same.
  • the terminal can consider that the two control resource sets have the same QCL-TypeD characteristics.
  • FIG. 11 is a diagram illustrating a method for a terminal to select a set of control resources that can be received in consideration of priority when receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
  • the terminal may be configured to receive a plurality of control resource sets that overlap in time in a specific PDCCH monitoring period (1110), and these plurality of control resource sets may be a common search space or a terminal-specific search space for a plurality of cells. It may be connected to .
  • a control resource set 1 (1115) connected to the common search section 1 within the 1st bandwidth portion (1100) of the 1st cell, and a 1st bandwidth portion (1105) of the 2nd cell.
  • Control resource sets (1115) and (1120) have a relationship between the No. 1 CSI-RS resource and QCL-TypeD set within the No. 1 bandwidth portion of Cell No. 1, and the control resource set (1125) is the No. 1 bandwidth of Cell No. 2. It may have a relationship between the number 1 CSI-RS resource set within the part and QCL-TypeD. Therefore, if criterion 1 is applied to the corresponding PDCCH monitoring section 1110, all other control resource sets having the same QCL-TypeD reference signal as the 1st control resource set 1115 can be received. Therefore, the terminal can receive control resource sets (1115) and (1120) in the corresponding PDCCH monitoring section (1110).
  • the terminal may be configured to receive a plurality of control resource sets that overlap in time in a specific PDCCH monitoring period (1140), and these plurality of control resource sets may be used in a common search space or a terminal-specific It may be connected to the search space.
  • the 1st control resource set (1145) within the 1st bandwidth portion (1130) of the 1st cell, the 1st control resource set (1145) connected to the terminal 1-specific search section and the 2nd control resource set connected to the 2nd terminal-specific search section.
  • Control resource sets (1145) and (1150) have a relationship between the No. 1 CSI-RS resource and QCL-TypeD set within the No. 1 bandwidth portion of Cell No. 1, and the control resource set (1155) is the No. 1 bandwidth of Cell No. 2. It has a relationship of QCL-TypeD with the No. 1 CSI-RS resource set within the part, and the control resource set 1160 can have a relationship of QCL-TypeD with the No. 2 CSI-RS resource set within the No. 1 bandwidth part of the No.
  • Figure 12 shows a process for beam setting and activation of a PDSCH according to an embodiment of the present disclosure.
  • the list of TCI states for PDSCH can be indicated through a higher layer list such as RRC (12-00).
  • the list of TCI states may be indicated, for example, as tci-StatesToAddModList and/or tci-StatesToReleaseList in the PDSCH-Config IE for each BWP.
  • some of the list of TCI states can be activated through MAC-CE (12-20).
  • the maximum number of activated TCI states can be determined depending on the capabilities reported by the terminal.
  • One of some TCI states activated via MAC-CE may be indicated via DCI (16-40).
  • (12-50) shows an example of the MAC-CE structure for PDSCH TCI state activation/deactivation.
  • This field indicates the identity of the Serving Cell for which the MAC CE applies.
  • the length of the field is 5 bits. If the indicated Serving Cell is configured as part of a simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 as specified in TS 38.331 [5], this MAC CE applies to all the Serving Cells configured in the set simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2, respectively;
  • BWP ID (Bandwidth Part Identifier): This field indicates a DL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212 [9].
  • the length of the BWP ID field is 2 bits. This field is ignored if this MAC CE applies to a set of Serving Cells;
  • TCI state identifier TCI state identifier: If there is a TCI state with TCI-StateId i as specified in TS 38.331 [5], this field indicates the activation/deactivation status of the TCI state with TCI-StateId i, otherwise MAC entity shall ignore the Ti field.
  • the Ti field is set to 1 to indicate that the TCI state with TCI-StateId i shall be activated and mapped to the codepoint of the DCI Transmission Configuration Indication field, as specified in TS 38.214 [7].
  • the Ti field is set to 0 to indicate that the TCI state with TCI-StateId i shall be deactivated and is not mapped to the codepoint of the DCI Transmission Configuration Indication field.
  • the codepoint to which the TCI State is mapped is determined by its ordinal position among all the TCI States with Ti field set to 1, ie the first TCI State with T i field set to 1 shall be mapped to the codepoint value 0, second TCI State with Ti field set to 1 shall be mapped to the codepoint value 1 and so on.
  • the maximum number of activated TCI states is 8;
  • CORESET Pool ID identifier This field indicates that mapping between the activated TCI states and the codepoint of the DCI Transmission Configuration Indication set by field Ti is specific to the ControlResourceSetId configured with CORESET Pool ID as specified in TS 38.331 [ 5]. This field set to 1 indicates that this MAC CE shall be applied for the DL transmission scheduled by CORESET with the CORESET pool ID equal to 1, otherwise, this MAC CE shall be applied for the DL transmission scheduled by CORESET pool ID equal to 0. If the coresetPoolIndex is not configured for any CORESET, MAC entity shall ignore the CORESET Pool ID field in this MAC CE when receiving the MAC CE. If the Serving Cell in the MAC CE is configured in a cell list that contains more than one Serving Cell, the CORESET Pool ID field shall be ignored when receiving the MAC CE.
  • the terminal can perform a procedure to report the capabilities supported by the terminal to the corresponding base station while connected to the serving base station. In the description below, this is referred to as a UE capability report.
  • the base station may transmit a UE capability inquiry (UE capability inquiry) message requesting a capability report to the terminal in the connected state.
  • the message may include a terminal capability request for each radio access technology (RAT) type of the base station.
  • the request for each RAT type may include information on combinations of supported frequency bands, etc.
  • UE capabilities for each RAT type may be requested through one RRC message container transmitted by the base station, or the base station may send a UE capability inquiry message including a UE capability request for each RAT type. It can be included multiple times and delivered to the terminal. For example, a UE capability inquiry may be repeated multiple times within one message, and the UE may construct a corresponding UE capability information message and report it multiple times.
  • terminal capability requests can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity).
  • MR-DC Multi-RAT dual connectivity
  • the RAT type for which the base station requests UE capabilities may include NR, LTE, or MR-DC.
  • the terminal capability inquiry message is generally transmitted initially after the terminal is connected to the base station, but the base station can request it under any conditions when necessary.
  • the terminal that has received a UE capability report request from the base station can configure the terminal capability according to the RAT type and band information requested from the base station.
  • the terminal configures UE capabilities in the NR system can be configured.
  • the terminal can configure a band combination (BC) for EN-DC and NR stand alone (SA). For example, the UE can configure a BC candidate list for EN-DC and NR SA based on the bands requested from the base station through FreqBandList. Additionally, the priorities of the bands may be in the order listed in FreqBandList.
  • BC band combination
  • SA stand alone
  • the base station requests UE capability reporting by setting the “eutra-nr-only” flag or “eutra” flag, the UE can completely remove NR SA BCs from the candidate list of configured BCs. . This operation can only occur if the LTE base station (eNB) requests “eutra” capability.
  • eNB LTE base station
  • fallback BC means BC that can be obtained by removing the band corresponding to at least one SCell from any BC, because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. It can be omitted.
  • This step is also applied in MR-DC and can also be applied, for example, in LTE bands.
  • the BCs remaining after this step are the final “candidate BC list”.
  • the terminal can select BCs to report by selecting BCs that fit the requested RAT type from the final “candidate BC list” above.
  • the terminal can configure the supportedBandCombinationList in a given order. For example, the terminal configures BC and UE capabilities to be reported in accordance with the order of the preset rat-Type. (nr -> eutra-nr -> eutra). You can also configure a featureSetCombination for the configured supportedBandCombinationList, and configure a list of "candidate feature set combinations" from the list of candidate BCs from which the list of fallback BCs (containing capabilities at the same or lower level) has been removed.
  • the above “candidate feature set combination” includes both feature set combinations for NR and EUTRA-NR BC, and can be obtained from the feature set combination of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.
  • featureSetCombinations can be included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities.
  • NR's feature set can only include UE-NR-Capabilities.
  • the terminal may transmit a terminal capability information message containing the terminal capability to the base station.
  • the base station can then perform appropriate scheduling and transmission/reception management for the terminal based on the terminal capabilities received from the terminal.
  • non-coherent joint transmission may be used for the UE to receive a PDSCH from multiple TRPs.
  • the 5G wireless communication system can support not only services that require high transmission speeds, but also services that require very short transmission delays and services that require high connection density.
  • a wireless communication network including multiple cells, transmission and reception points (TRPs), or beams
  • TRPs transmission and reception points
  • coordinated transmission between each cell, TRP, or/and beam increases the strength of the signal received by the terminal or increases the strength of the signal received by each cell.
  • TRP or/and inter-beam interference control can be efficiently performed to satisfy various service requirements.
  • Joint Transmission is a representative transmission technology for the above-described cooperative communication, and transmits signals to one terminal through multiple different cells, TRPs, or/and beams, thereby measuring the strength or throughput of the signal received by the terminal. It is a technology that increases. At this time, the characteristics of the channel between each cell, TRP or/and beam and the terminal may be significantly different, especially those that support non-coherent precoding between each cell, TRP or/and beam. In the case of Non-Coherent Joint Transmission (NC-JT), individual precoding, MCS, resource allocation, TCI indication, etc. are required depending on the channel characteristics of each cell, TRP or/and link between beam and terminal. You can.
  • NC-JT Non-Coherent Joint Transmission
  • the above-described NC-JT transmission includes a downlink data channel (PDSCH: physical downlink shared channel), a downlink control channel (PDCCH: physical downlink control channel), an uplink data channel (PUSCH: physical uplink shared channel), and an uplink control channel. It can be applied to at least one channel (PUCCH: physical uplink control channel).
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • transmission information such as precoding, MCS, resource allocation, and TCI is indicated in DL DCI
  • the transmission information must be indicated independently for each cell, TRP, or/and beam. This is a major factor in increasing the payload required for DL DCI transmission, which may adversely affect the reception performance of the PDCCH transmitting DCI. Therefore, to support JT of PDSCH, it is necessary to carefully design the tradeoff between DCI information amount and control information reception performance.
  • FIG. 13 is a diagram illustrating an example of antenna port configuration and resource allocation for transmitting a PDSCH using cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
  • JT Joint Transmission
  • C-JT Coherent Joint Transmission
  • TRP A 1305 and TRP B 1310 transmit single data (PDSCH) to the UE 1315, and joint precoding can be performed on multiple TRPs.
  • the joint precoding may mean that DMRS is transmitted through the same DMRS ports so that TRP A (1305) and TRP B (1310) transmit the same PDSCH.
  • TRP A (1305) and TRP B (1310) can transmit DRMS to the terminal through DMRS port A and DMRS B, respectively.
  • the terminal can receive one DCI information for receiving one PDSCH demodulated based on DMRS transmitted through DMRS port A and DMRS B.
  • Figure 13 is an example of non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP or/and beam for PDSCH transmission (Non-Coherent Joint Transmission) 1320).
  • NC-JT non-coherent joint transmission
  • TRP or/and beam for PDSCH transmission Non-Coherent Joint Transmission 1320.
  • a PDSCH is transmitted to the UE 1335 for each cell, TRP, or/and beam, and individual precoding may be applied to each PDSCH.
  • Each cell, TRP or/and beam can transmit different PDSCHs or different PDSCH layers to the terminal, thereby improving throughput compared to single cell, TRP or/and beam transmission.
  • each cell, TRP or/and beam can repeatedly transmit the same PDSCH to the UE, thereby improving reliability compared to single cell, TRP or/and beam transmission.
  • TRPs cells, TRPs or/and beams are hereinafter collectively referred to as TRPs.
  • the multiple TRPs may be considered, such as when some of the used frequency and time resources overlap (1350).
  • DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to one UE.
  • FIG 14 shows the configuration of downlink control information (DCI) for NC-JT, in which each TRP transmits a different PDSCH or a different PDSCH layer to the terminal in a wireless communication system according to an embodiment of the present disclosure.
  • DCI downlink control information
  • case #1 (1400) receives information from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used when transmitting a single PDSCH.
  • TRP#0 the serving TRP
  • control information for PDSCHs transmitted in (N-1) additional TRPs is transmitted independently from control information for PDSCHs transmitted in the serving TRP.
  • the UE controls PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through independent DCIs (DCI#0 to DCI#(N-1)). Information can be obtained.
  • 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.
  • the degree of control or allocation freedom for each PDSCH can be completely guaranteed, but if each DCI is transmitted in different TRPs, a difference in coverage for each DCI may occur and reception performance may deteriorate.
  • Case #2 (1405) is a different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used when transmitting a single PDSCH. )
  • control information DCI
  • each of these DCIs is dependent on the control information for the PDSCH transmitted from the serving TRP.
  • DCI#0 which is the control information for the PDSCH transmitted from the serving TRP (TRP#0)
  • DCI format 1_0 the control information for the PDSCH transmitted from the serving TRP (TRP#0)
  • sDCI shortened DCI
  • DCI format 1_0 the cooperative TRP
  • DCI format 1_0 It may contain only some of the information elements of DCI format 1_1 and DCI format 1_2.
  • the payload is smaller than normal DCI (nDCI), which transmits control information related to PDSCHs transmitted from serving TRPs, so it is compared with nDCI.
  • nDCI normal DCI
  • the degree of freedom of control or allocation of each PDSCH may be limited depending on the content of the information element included in sDCI, but since the reception performance of sDCI is superior to nDCI, differences in coverage for each DCI may occur. The probability may be lowered.
  • Case #3 is a different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used when transmitting a single PDSCH. )
  • TRP#1 to TRP#(N-1) the serving TRP
  • TRP#0 serving TRP
  • DCI#0 which is the control information for the PDSCH transmitted from the serving TRP (TRP#0)
  • it includes all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, and the cooperative TRP
  • the sDCI may include at least one of HARQ-related information such as frequency domain resource assignment, time domain resource assignment, and MCS of cooperative TRPs.
  • BWP bandwidth part
  • nDCI the DCI (DCI#0, normal DCI, nDCI) of the serving TRP can be followed.
  • case #3 (1410) the control or allocation freedom of each PDSCH may be limited depending on the content of the information element included in sDCI, but the reception performance of sDCI can be adjusted, and case #1 (1400) or case #2 Compared to (1405), the complexity of DCI blind decoding of the terminal may be reduced.
  • Case #4 is a different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used when transmitting a single PDSCH.
  • this is an example of transmitting control information for PDSCHs transmitted from (N-1) additional TRPs on the same DCI (Long DCI) as control information for PDSCHs transmitted from serving TRPs.
  • the UE can obtain control information about PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI.
  • the complexity of DCI blind decoding of the terminal may not increase, but the number of cooperative TRPs may be limited due to long DCI payload limitations, and the degree of freedom in PDSCH control or allocation may be low.
  • sDCI may refer to various secondary DCIs such as shortened DCI, secondary DCI, or normal DCI (DCI format 1_0 to 1_1 described above) including PDSCH control information transmitted in a cooperative TRP, and has no special restrictions. Unless otherwise specified, the description is similarly applicable to the various auxiliary DCIs above.
  • case #1 (1400), case #2 (1405), and case #3 (1410), in which more than one DCI (PDCCH) is used to support NC-JT are used as multiple PDCCH.
  • the case #4 (1415) described above, in which a single DCI (PDCCH) is used to support NC-JT, can be classified as a single PDCCH-based NC-JT.
  • CORESET in which the DCI of the serving TRP (TRP#0) is scheduled and CORESET in which the DCI of the cooperative TRPs (TRP#1 to TRP#(N-1)) are scheduled can be distinguished.
  • Methods for distinguishing CORESETs include a method of distinguishing through upper layer indicators for each CORESET and a method of distinguishing through beam settings for each CORESET.
  • a single DCI schedules a single PDSCH with multiple layers instead of scheduling multiple PDSCHs, and the multiple layers described above can be transmitted from multiple TRPs.
  • the connection relationship between a layer and a TRP transmitting the layer may be indicated through a Transmission Configuration Indicator (TCI) indication for the layer.
  • TCI Transmission Configuration Indicator
  • cooperative TRP may be replaced with various terms such as “cooperative panel” or “cooperative beam” in actual application.
  • “when NC-JT is applied” means “when the terminal receives one or more PDSCHs simultaneously from one BWP” and “when the terminal receives two or more TCIs (Transmission It is possible to interpret it in various ways depending on the situation, such as "when PDSCH is received based on the Configuration Indicator indication" or "when the PDSCH received by the terminal is associated with one or more DMRS port groups.” For convenience, one expression was used.
  • the wireless protocol structure for NC-JT can be used in various ways depending on the TRP deployment scenario. For example, if there is no or small backhaul delay between cooperative TRPs, a method using a structure based on MAC layer multiplexing (CA-like method) is possible. On the other hand, when the backhaul delay between cooperative TRPs is too large to be ignored (for example, when more than 2 ms is required to exchange information such as CSI, scheduling, HARQ-ACK, etc. between cooperative TRPs), independent TRP from RLC layer A method (DC-like method) that secures characteristics that are robust against delay is possible by using the phosphor structure.
  • CA-like method a method using a structure based on MAC layer multiplexing
  • a terminal that supports C-JT / NC-JT can receive C-JT / NC-JT related parameters or setting values from the upper layer settings and set the RRC parameters of the terminal based on this.
  • the UE can utilize UE capability parameters, for example, tci-StatePDSCH.
  • the UE capability parameter for example, tci-StatePDSCH
  • the maximum value of 128 means the value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in the terminal's capability signaling.
  • the multi-DCI based multi-TRP transmission method can set a downlink control channel for NC-JT transmission based on Multi-PDCCH.
  • CORESET or search space can be separated for each TRP.
  • CORESET or search space for each TRP can be set as at least one of the following cases.
  • CORESET setting information set as the upper layer may include an index value, and the TRP that transmits the PDCCH in the corresponding CORESET can be distinguished by the index value for each CORESET set.
  • the same TRP may be considered to transmit a PDCCH, or a PDCCH scheduling a PDSCH of the same TRP may be considered to be transmitted.
  • the index for each CORESET described above may be named as CORESETPoolIndex, and for CORESETs with the same CORESETPoolIndex value set, it can be considered that the PDCCH is transmitted from the same TRP.
  • the default value of CORESETPoolIndex can be considered to be set, and the above-described default value may be 0.
  • the terminal is connected to the base station. It can be considered that this multi-DCI based multi-TRP transmission method can be used.
  • the terminal if each of a plurality of CORESETs included in the PDCCH-Config, which is upper layer signaling, has one type of CORESETPoolIndex, that is, if all CORESETs have the same CORESETPoolIndex of 0 or 1, the terminal It can be considered that the base station transmits using single-TRP rather than using the multi-DCI-based multi-TRP transmission method.
  • each PDCCH-Config may include PDCCH settings for each TRP.
  • a list of CORESETs for each TRP and/or a list of search spaces for each TRP may be configured in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config are considered to correspond to a specific TRP. can do.
  • TRPs corresponding to the CORESET can be distinguished through the beam or beam group set for each CORESET. For example, if the same TCI state is set in multiple CORESETs, the CORESETs may be considered to be transmitted through the same TRP, or the PDCCH scheduling the PDSCH of the same TRP may be considered to be transmitted in the CORESETs.
  • Search space beam/beam group configuration A beam or beam group is configured for each search space, and through this, the TRP for each search space can be distinguished. For example, if the same beam/beam group or TCI state is set in multiple search spaces, the same TRP may be considered to transmit the PDCCH in the search space, or the PDCCH scheduling the PDSCH of the same TRP may be considered to be transmitted in the search space. there is.
  • the above settings may be independent per cell or per BWP.
  • two different CORESETPoolIndex values may be set for a PCell, while no CORESETPoolIndex value may be set for a specific SCell.
  • NC-JT transmission is configured in the PCell, it can be considered that NC-JT transmission is not configured in the SCell for which the CORESETPoolIndex value is not set.
  • the PDSCH TCI state activation/deactivation MAC-CE applicable to the multi-DCI based multi-TRP transmission method can follow FIG. 12 above. If the terminal has not set CORESETPoolIndex for each of all CORESETs in the upper layer signaling PDCCH-Config, the terminal may ignore the CORESET Pool ID field (12-55) in the corresponding MAC-CE (12-50). If the terminal can support the multi-DCI-based multi-TRP transmission method, that is, if each CORESET in the terminal's upper layer signaling PDCCH-Config has a different CORESETPoolIndex, the terminal is within the corresponding MAC-CE (12-50).
  • the TCI state in the DCI included in the PDCCH transmitted in CORESETs with a CORESETPoolIndex value equal to the value of the CORESET Pool ID field (12-55) can be activated. For example, if the value of the CORESET Pool ID field (12-55) in the corresponding MAC-CE (12-50) is 0, the TCI state in the DCI included in the PDCCH transmitted from CORESETs with CORESETPoolIndex of 0 is that of the corresponding MAC-CE. You can follow the activation information.
  • the terminal When the terminal is configured to use the multi-DCI-based multi-TRP transmission method from the base station, for example, the type of CORESETPoolIndex for each of the plurality of CORESETs included in PDCCH-Config, which is upper layer signaling, exceeds one.
  • the UE can know that the following restrictions exist for PDSCHs scheduled from PDCCHs in each CORESET having two different CORESETPoolIndex.
  • the UE can apply the TCI states indicated from each PDCCH to different CDM groups. For example, two or more TCI states may not be applied to one CDM group.
  • the UE determines the actual number of front loaded DMRS symbols of each PDSCH, the actual number of additional DMRS symbols, the actual location of the DMRS symbol, and the DMRS. You can expect the types to not be different from each other.
  • the terminal can expect that the bandwidth indicated from the PDCCH in each CORESET with two different CORESETPoolIndex is the same and the subcarrier spacing is also the same.
  • each PDCCH completely contains information about the scheduled PDSCH from the PDCCH in each CORESET with two different CORESETPoolIndex.
  • a single-DCI based multi-TRP transmission method is described.
  • the single-DCI based multi-TRP transmission method can set a downlink control channel for NC-JT transmission based on single-PDCCH.
  • the number of TCI states can be used as a method to indicate the number of TRPs transmitting the corresponding PDSCH. For example, if the number of TCI states indicated in the DCI scheduling the PDSCH is 2, it can be regarded as a single PDCCH-based NC-JT transmission, and if the number of TCI states is 1, it can be regarded as a single-TRP transmission.
  • the TCI states indicated in the above DCI may correspond to one or two TCI states among the TCI states activated by MAC-CE.
  • TCI states of DCI correspond to two TCI states activated by MAC-CE
  • a correspondence relationship is established between the TCI codepoint indicated in DCI and the TCI states activated by MAC-CE, and the MAC corresponding to the TCI codepoint -This may be when there are two TCI states activated with CE.
  • the terminal may consider that the base station can transmit based on the single-DCI based multi-TRP method. You can. At this time, at least one codepoint indicating two TCI states within the TCI state field can be activated through Enhanced PDSCH TCI state activation/deactivation MAC-CE.
  • Figure 15 is a diagram showing the Enhanced PDSCH TCI state activation/deactivation MAC-CE structure according to an embodiment of the present disclosure.
  • the meaning of each field in the MAC CE and the values that can be set for each field are as follows.
  • This field indicates the identity of the Serving Cell for which the MAC CE applies.
  • the length of the field is 5 bits. If the indicated Serving Cell is configured as part of a simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2 as specified in TS 38.331 [5], this MAC CE applies to all the Serving Cells configured in the set simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2, respectively;
  • This field indicates a DL BWP for which the MAC CE applies as the codepoint of the DCI bandwidth part indicator field as specified in TS 38.212 [9].
  • the length of the BWP ID field is 2 bits;
  • This field indicates whether the octet containing TCI state ID i,2 is present. If this field is set to "1", the octet containing TCI state ID i,2 is present. If this field is set to "0", the octet containing TCI state ID i,2 is not present;
  • TCI state ID i,j This field indicates the TCI state identified by TCI-StateId as specified in TS 38.331 [5], where i is the index of the codepoint of the DCI Transmission configuration indication field as specified in TS 38.212 [9 ] and TCI state ID i,j denotes the j-th TCI state indicated for the i-th codepoint in the DCI Transmission Configuration Indication field.
  • the TCI codepoint to which the TCI States are mapped is determined by its ordinal position among all the TCI codepoints with sets of TCI state ID i,j fields, ie the first TCI codepoint with TCI state ID 0,1 and TCI state ID 0, 2 shall be mapped to the codepoint value 0, the second TCI codepoint with TCI state ID 1,1 and TCI state ID 1,2 shall be mapped to the codepoint value 1 and so on.
  • the TCI state ID i,2 is optional based on the indication of the Ci field.
  • the maximum number of activated TCI codepoint is 8 and the maximum number of TCI states mapped to a TCI codepoint is 2.
  • the corresponding MAC-CE includes the TCI state ID 0,2 field (15-15) in addition to the TCI state ID 0,1 field (15-10). It can be included. Additionally, inclusion of the TCI state ID 0,2 field (15-15) may mean that TCI state ID 0,1 and TCI state ID 0,2 are activated for the 0th codepoint of the TCI state field included in the DCI. there is. If the base station indicates the corresponding codepoint to the terminal, the terminal can receive two TCI states.
  • the corresponding MAC-CE cannot include the TCI state ID 0,2 field (15-15), and the TCI state ID 0,2 field (15-15) Not including may mean that one TCI state corresponding to TCI state ID 0,1 is activated for the 0th codepoint of the TCI state field included in the DCI.
  • the above settings may be independent per cell or per BWP.
  • a PCell may have a maximum of two activated TCI states corresponding to one TCI codepoint, while a specific SCell may have a maximum of one activated TCI state corresponding to one TCI codepoint.
  • NC-JT transmission is configured in the PCell, while NC-JT transmission is not configured in the SCell described above.
  • the UE may receive instructions from the base station for different single-DCI-based multi-TRP PDSCH repetitive transmission techniques (e.g., TDM, FDM, SDM) depending on the value indicated in the DCI field and higher layer signaling settings.
  • Table 17 shows a method of distinguishing between single or multiple TRP-based techniques indicated to the UE according to the value of a specific DCI field and upper layer signaling settings.
  • TCI state 2 This refers to the number of TCI states indicated by the TCI state field in the DCI, and can be 1 or 2.
  • CDM groups (column 3): This refers to the number of different CDM groups of DMRS ports indicated by the Antenna port field in DCI. It can be 1, 2 or 3.
  • Condition 1 At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field includes a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI has a setting for repetitionNumber greater than 1. If you include settings
  • Condition 2 At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field includes a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI includes a setting for repetitionNumber If you don't
  • Condition 3 When all TDRA entries that can be indicated by the Time Domain Resource Allocation field do not include a setting for repetitionNumber.
  • RepetitionScheme setting related (column 5): Indicates whether repetitionScheme, which is upper layer signaling, is set. RepetitionScheme, which is upper layer signaling, can be set to one of 'tdmSchemeA', 'fdmSchemeA', and 'fdmSchemeB'.
  • Single-TRP refers to single TRP-based PDSCH transmission. If the terminal has been configured with pdsch-AggegationFactor in the upper layer signaling PDSCH-config, the terminal can receive a single TRP-based repetitive PDSCH transmission scheduled for the number of times configured. Otherwise, the UE can schedule a single PDSCH transmission based on a single TRP.
  • Single-TRP TDM scheme B refers to PDSCH repetitive transmission based on time resource division between slots based on a single TRP.
  • the terminal repeatedly transmits the PDSCH on the time dimension as many slots as the repetitionNumber number greater than 1 set in the TDRA entry indicated by the Time Domain Resource Allocation field.
  • the same start symbol and symbol length of the PDSCH indicated by the TDRA entry are applied to each slot as many repetitionNumber times, and the same TCI state is applied to each PDSCH repetition transmission.
  • This technique is similar to the slot aggregation method in that it performs repetitive PDSCH transmission between slots on time resources, but differs from slot aggregation in that it can dynamically determine whether to direct repeated transmission based on the Time Domain Resource Allocation field in DCI. there is.
  • Multi-TRP SDM refers to a multi-TRP based spatial resource division PDSCH transmission method.
  • the Multi-TRP SDM is a method of receiving by dividing layers from each TRP. Although it is not a repetitive transmission method, the reliability of PDSCH transmission can be increased in that it can be transmitted by lowering the coding rate by increasing the number of layers.
  • the UE can receive the PDSCH by applying the two TCI states indicated through the TCI state field in the DCI to each of the two CDM groups indicated by the base station.
  • Multi-TRP FDM scheme A This refers to a multi-TRP based frequency resource division PDSCH transmission method. It has one PDSCH transmission location (occasion), so it is not a repetitive transmission like multi-TRP SDM, but the coding rate is increased by increasing the amount of frequency resources. This is a technique that can be transmitted with high reliability by lowering the . Multi-TRP FDM scheme A can apply two TCI states indicated through the TCI state field in DCI to frequency resources that do not overlap each other.
  • the UE applies the first TCI state to the first ceil (N/2) RBs when the number of RBs indicated in the Frequency Domain Resource Allocation field is N, and the remaining floor (N/ 2) RBs can be received by applying the second TCI state.
  • ceil(.) and floor(.) are operators that mean rounding up and rounding down to the first decimal place.
  • the PRB bundling size is determined to be 2 or 4
  • the UE can receive the even-numbered PRGs by applying the first TCI state and the odd-numbered PRGs by applying the second TCI state.
  • Multi-TRP FDM scheme B This refers to a multi-TRP based frequency resource division PDSCH repetitive transmission method. It has two PDSCH transmission locations (occasions) and can transmit PDSCH repeatedly to each location. Multi-TRP FDM scheme B, like A, can apply two TCI states indicated through the TCI state field in DCI to frequency resources that do not overlap each other. If the PRB bundling size is determined to be wideband, the UE applies the first TCI state to the first ceil (N/2) RBs when the number of RBs indicated in the Frequency Domain Resource Allocation field is N, and the remaining floor (N/ 2) RBs can be received by applying the second TCI state.
  • ceil(.) and floor(.) are operators that mean rounding up and rounding down to the first decimal place. If the PRB bundling size is determined to be 2 or 4, the UE can receive the even-numbered PRGs by applying the first TCI state and the odd-numbered PRGs by applying the second TCI state.
  • Multi-TRP TDM scheme A Refers to a PDSCH repetitive transmission scheme within a multi-TRP based time resource division slot.
  • the terminal has two PDSCH transmission positions (occasions) within one slot, and the first reception position can be determined based on the start 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 where a symbol offset is applied from the last symbol of the first transmission position by StartingSymbolOffsetK , which is upper layer signaling, and the transmission position can be determined by the symbol length indicated from this. If the upper layer signaling StartingSymbolOffsetK is not set, the symbol offset can be considered 0.
  • Multi-TRP TDM scheme B Refers to a PDSCH repetitive transmission scheme between multiple TRP-based time resource division slots.
  • the terminal has one PDSCH transmission location (occasion) within one slot, and receives repeated transmissions based on the start symbol and symbol length of the same PDSCH during slots equal to the repetitionNumber number indicated through the Time Domain Resource Allocation field in the DCI. can do. If repetitionNumber is 2, the UE can receive PDSCH repetition transmissions in the first and second slots by applying the first and second TCI states, respectively. If repetitionNumber is greater than 2, the terminal can use different TCI state application methods depending on which tciMapping, which is upper layer signaling, is set.
  • tciMapping is set to cyclicMapping
  • the first and second TCI states are applied to the first and second PDSCH transmission locations, respectively, and this TCI state application method can be equally applied to the remaining PDSCH transmission locations.
  • tciMapping is set to sequentialMapping
  • the first TCI state is applied to the first and second PDSCH transmission locations
  • the second TCI state is applied to the third and fourth PDSCH transmission locations
  • this TCI state application method is used for the remaining The same can be applied to the PDSCH transmission location.
  • the integrated TCI method is a method of managing the transmission and reception beam management methods, which were differentiated into the TCI state method used in downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used in uplink transmission, into the TCI state. It can mean. Therefore, when the terminal receives instructions from the base station based on the integrated TCI method, it can perform beam management using the TCI state even for uplink transmission.
  • TCI-State which is higher layer signaling, and has tci-stateId-r17, which is higher layer signaling, from the base station
  • the terminal can use the corresponding TCI-State to perform operations based on the integrated TCI method.
  • TCI-State can exist in two forms: joint TCI state or separate TCI state.
  • the first type is the joint TCI state
  • the terminal can receive instructions from the base station of both the TCI state to be applied to uplink transmission and downlink reception through one TCI-State. If the UE is instructed to use a TCI-State based on the joint TCI state, the UE uses the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state to determine parameters to be used for downlink channel estimation and qcl-Type2. Parameters to be used as a downlink reception beam or reception filter can be indicated using the corresponding RS.
  • the UE uses the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL/UL TCI state to set parameters to be used as an uplink transmission beam or transmission filter. You can receive instructions.
  • the terminal can apply the same beam to both uplink transmission and downlink reception.
  • the second type is a separate TCI state, and the terminal can be individually instructed by the base station of the UL TCI state to be applied to uplink transmission and the DL TCI state to be applied to downlink reception. If the UE is instructed to use the UL TCI state, the UE can be instructed to use the reference RS or source RS set in the UL TCI state for parameters to be used as an uplink transmission beam or transmission filter. If the UE is instructed to use a DL TCI state, the UE sets parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the DL TCI state, and downlink using the RS corresponding to qcl-Type2. Parameters to be used as a reception beam or reception filter can be instructed.
  • the UE can be instructed on the parameters to be used as an uplink transmission beam or transmission filter using the reference RS or source RS set in the UL TCI state, and the DL Parameters to be used for downlink channel estimation can be indicated using the RS corresponding to qcl-Type1 set in the TCI state, and parameters to be used as a downlink reception beam or reception filter can be indicated using the RS corresponding to qcl-Type2.
  • the UE individually performs uplink transmission and downlink reception based on the indicated UL TCI state and DL TCI state. You can apply the beam.
  • the terminal can receive up to 128 joint TCI states from the base station through upper layer signaling for each specific bandwidth part within a specific cell, and among the separate TCI states, the DL TCI state can be set to a maximum of 128 for each specific bandwidth part within a specific cell based on the UE capability report.
  • Up to 64 or 128 can be set as upper layer signaling, and among separate TCI states, the DL TCI state and 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 128 joint TCI states.
  • UL TCI state can be set to upper layer signaling up to 32 or 64 for each specific bandwidth part within a specific cell based on UE capability reporting, and the relationship between DL TCI state and joint TCI state among separate TCI states.
  • the UL TCI state and the joint TCI state among separate TCIs may also use the same upper layer signaling structure, and the UL TCI state among separate TCIs may use a different upper layer signaling structure from the DL TCI state among the joint TCI state and separate TCI states. It may be possible.
  • upper layer signaling structures may be defined in the standard, or another method set by the base station based on the terminal capability report containing information on whether or not the terminal can support one of the two usage methods. They may also be distinguished through upper layer signaling.
  • the terminal can receive transmission/reception beam-related instructions in the integrated TCI method using either the joint TCI state or the separate TCI state set by the base station.
  • the terminal can be configured through upper layer signaling from the base station as to whether to use one of the joint TCI state and the separate TCI state.
  • this disclosure describes a method of setting/updating the integrated TCI state considering a situation in which multiple TRPs/panels are supported in a wireless communication system.
  • the base station may provide the terminal with information related to mapping between the configured/indicated joint TCI state or DL TCI state and at least one CORESET or at least one CORESET group through upper layer (e.g., RRC) signaling.
  • upper layer e.g., RRC
  • the base station provides the terminal with information related to mapping between the set/indicated joint TCI state or DL TCI state and at least one search space or at least one search space set (or group) through upper layer (e.g. RRC) signaling. can do.
  • upper layer e.g. RRC
  • the base station may provide the terminal with information related to mapping between the activated/indicated joint TCI state or DL TCI state and at least one CORESET or at least one CORESET group through upper layer (e.g. MAC-CE) signaling. .
  • upper layer e.g. MAC-CE
  • the base station provides mapping-related information between the set/indicated joint TCI state or DL TCI state and at least one search space or at least one search space set (or group) through upper layer (e.g. MAC-CE) signaling. can be provided to.
  • upper layer e.g. MAC-CE
  • the base station may provide the terminal with information related to mapping between the activated/indicated joint TCI state or DL TCI state and at least one CORESET or at least one CORESET group through L1 (e.g., DCI) signaling.
  • L1 e.g., DCI
  • the base station provides the terminal with information related to mapping between the set/indicated joint TCI state or DL TCI state and at least one search space or at least one search space set (or group) through L1 (e.g. DCI) signaling. You can.
  • L1 e.g. DCI
  • the base station and the terminal may decide to apply the joint TCI state or DL TCI state indicated by a fixed rule (e.g., first or last) for PDCCH reception to at least one CORESET or at least one CORESET group.
  • a fixed rule e.g., first or last
  • the base station and the terminal apply the joint TCI state or DL TCI state indicated by a fixed rule (e.g., first or last) to at least one search space or at least one search space set (or group) for PDCCH reception. You can decide to do it.
  • a fixed rule e.g., first or last
  • the various embodiments above can also be considered in repeatedly transmitted PDCCH reception, single frequency network-based PDCCH reception, and dynamic switching operations between single-TRP and multiple-TRP.
  • the base station and the terminal can apply single or multiple TCI states information for specific CORESET(s) based on the signaling method (e.g., RRC) described above.
  • the signaling method e.g., RRC
  • the base station may provide the terminal with information related to whether or not multiple (e.g., 2) TCI states are supported.
  • the CORESET setting (e.g., ControlResourceSet IE) may include a parameter indicating whether multiple TCI states are supported.
  • the base station can set a parameter indicating whether it supports a plurality of TCI states included in the CORESET setting to enabled or disabled. If the parameter is set to “Active”, the corresponding CORESET can support 2 or more TCI states being set.
  • the base station may separately set a CORESET group in relation to CORESET settings.
  • a CORESET group ID (identifier) can be set within the CORESET setting (e.g., ControlResourceSet IE).
  • the CORESET group ID may be a different parameter from CORESETPoolindex, and will hereinafter be expressed as CORESETgID for convenience of explanation. However, these terms do not limit the technical scope of the present disclosure. Support for multiple TCI states can be set to enabled or disabled using the CORESETgID setting in CORESET settings.
  • whether or not multiple TCI states are supported can be set based on the value of CORESETgID. If the base station sets CORESETgID to 0 in the CORESET configuration, the corresponding CORESET(s) can support a single TCI state (i.e., one TCI state can be set for the corresponding CORESET(s)). If the base station sets a different CORESETgID (e.g., 1) in the CORESET setting, two TCI states can be set for the corresponding CORESET(s).
  • the values of 0 and 1 set as CORESETgID above may be replaced with each other, or may be replaced with other values, and are not limited to the above example.
  • whether to support multiple TCI states can be set based on the number of CORESETgIDs. If the base station sets CORESETgID to two values (e.g., 0 and 1) in the CORESET setting, the corresponding CORESET(s) may support multiple (e.g., 2) TCI states being set (e.g., Multiple (e.g., 2) TCI states may be set for CORESET(s). If the base station sets CORESETgID to one value (e.g., 1 or 2) in the CORESET configuration, a single TCI state can be set for the corresponding CORESET(s). The values of 0, 1, and 2 set above can be replaced with other values and are not limited to the above example.
  • CORESETgID may be associated with TRP. For example, if CORESETgID is 0, it may be associated with the first TRP, and if CORESETgID is 1, it may be associated with the second TRP. If CORESETgID is set to 0 and 1 for one CORESET, the CORESET may be associated with the first TRP and the second TRP. In this case, the CORESET may support multiple (e.g., 2) TCI states being set (e.g., multiple (e.g., 2) TCI states may be set for the CORESET).
  • CORESET can be set to be linked to TRP by using the setting of CORESETgID within the CORESET settings (e.g., ControlResourceSet IE). If the base station sets CORESETgID to a specific value (e.g. 0) in the CORESET setting, the corresponding CORESET(s) is set in connection with the first TRP, and if the base station sets CORESETgID to another value (e.g. 1), the corresponding CORESET(s) s) may be set in connection with the second TRP. In this way, if the first TRP and the second TRP are all set to different CORESETgIDs, the terminal can determine that multiple (e.g., 2) TCI states are set for the CORESET.
  • CORESETgID within the CORESET settings (e.g., ControlResourceSet IE). If the base station sets CORESETgID to a specific value (e.g. 0) in the CORESET setting, the corresponding CORESET(s) is set in
  • the terminal when CORESETs with different CORESETgIDs are set to the terminal, the terminal can determine that each CORESET supports multiple TCI states.
  • the terminal may determine that two TCI states are set for each of the first CORESET and the second CORESET. Meanwhile, if the first TRP and the second TRP are all set to the same CORESETgID, the terminal can determine that one TCI state is set for the CORESET. In other words, if the CORESETs configured for the terminal have the same CORESETgID, the terminal can determine that each CORESET supports one TCI state.
  • the base station may reinterpret and reuse existing parameters rather than creating additional parameters.
  • the base station and the terminal may determine that a single TCI state is set in the CORESET. For example, when the CORESETPoolindex value in a specific CORESET setting is set to 0, the base station and the terminal may determine that two TCI states are set in the CORESET.
  • the base station can set single or two TCI state related information in the search space or search space set/group setting associated with a specific CORESET.
  • the base station can configure the terminal to link the search space set/group and CORESET in the search space setting (e.g., SearchSpaceExt-r18).
  • the base station can set followUnifiedTCIstateForsearchSpace to “enabled” in RRC settings.
  • followUnifiedTCIstateForsearchSpace is enabled, the terminal can follow the TCI state setting of the CORESET setting of the CORESET ID associated with the Search Space setting associated with the same Search Space set/group ID (e.g. SSgroupID or SSlinkingID, etc.).
  • the terminal is set in the Search Space (set) resource section. It can be determined that a single TCI state is also set.
  • followUnifiedTCIstateForsearchSpace is enabled, if two TCI states are set in the CORESET setting of the CORESET ID associated with the set Search Space setting, the terminal may determine that two TCI states are also set in the Search Space (set) resource section. .
  • the terminal is the lowest CORESET ID among the CORESETs corresponding to the above linked Search spaces (set/group) and/or the lowest Search space (set/group) ID among the linked Search spaces (set/group) preset in the resource.
  • a single TCI state can be applied.
  • Figure 16 shows an example of applying/setting the TCI state to CORESET and search space (set) according to an embodiment of the present disclosure.
  • Figure 16 shows an example in which the base station sets CORESET 0 (16-10) and CORESET 1 (16-20) in BWP #1 (16-00) and supports Unified TCI states.
  • CORESETPoolindex is not set or CORESETPoolindex is set to 0.
  • FIG. 16 shows PDCCH resources to explain in terms of the TCI states of the PDCCH, and the resources of the remaining channels (e.g., PDSCH, PUSCH, PUCCH) are omitted, but this does not mean that there is no scheduling.
  • the base station transmits PDCCH #1, #2, #4, #6, #8, #9 within CORESET 0 (16-10).
  • the base station can set Search Space Set #3 (16-70) in connection with CORESET 1 (16-20) for PDCCH #5 and #11 transmission within CORESET 1 (16-20).
  • the terminal may use i) CORESET 0 (16-10), which is the lowest CORESET ID among the CORESETs corresponding to the associated search space sets, or ii) search space set #2 (the lowest search space set ID among the associated search space sets) 16-60), a preset single TCI state can be applied to PDCCH reception.
  • the terminal can apply each single TCI state preset in the associated Search space (set/group) resource.
  • the base station transmits PDCCH #1, #2, #4, #6, #8, #9 within CORESET 0 (16-10).
  • the base station can set Search Space Set #3 (16-70) in connection with CORESET 1 (16-20) for PDCCH #5 and #11 transmission within CORESET 1 (16-20).
  • the terminal can apply each preset single TCI state in the linked Search space (set) #2 (16-60) and Search space (set) #3 (16-70). For example, the terminal can detect/receive PDCCH #3, #7, and #10 in Search space (set) #2 (16-60) based on the single TCI state set in CORESET 0 (16-10). . Additionally, the terminal can detect/receive PDCCH #5 and #11 in search space set #3 (16-70) based on the single TCI state set in CORESET 1 (16-20).
  • the terminal It can be determined that the second (or first) TCI state of each CORESET set above is set in the associated search space (set/group).
  • the base station may set CORESET 0 (16-10) and CORESET 1 (16-20), and each CORESET may be set to support two Unified TCI states.
  • the base station uses Search Space Set #1 (16) in conjunction with CORESET 0 (16-10) to transmit PDCCH #1, #2, #4, #6, #8, #9 within CORESET 0 (16-10). -50), and to transmit PDCCH #3, #7, #10 within CORESET 0 (16-10), Search Space Set #2 (16-60) is linked to CORESET 0 (16-10). You can set it.
  • the base station can set Search Space Set #3 (16-70) in connection with CORESET 1 (16-20) for PDCCH #5 and #11 transmission within CORESET 1 (16-20).
  • the base station sets two TCI states enabled in CORESET 0 (16-10) and CORESET 1 (16-20), and searches space set #2 (16-60) and search space set #3.
  • the terminal sets the second (or first) TCI state of each of CORESET 0 (16-10) and CORESET 1 (16-20) set above to the linked search space set # 2 (16-60) and search space set #3 (16-70).
  • the terminal uses PDCCH #3, #7, and #10 in Search space (set) #2 (16-60) based on the second (or first) TCI state set in CORESET 0 (16-10). Can be detected/received.
  • the terminal can detect/receive PDCCH #5 and #11 in search space set #3 (16-70) based on the second (or first) TCI state set in CORESET 1 (16-20).
  • ⁇ Second embodiment In the integrated TCI method based on multiple TRP and single DCI, TCI indication using DCI format for PDCCH reception (On unified TCI framework extension for S-DCI based Multiple-TRP, to indicate a joint/DL TCI state using DCI format to PDCCH reception(s))>
  • the base station can set an integrated TCI state to the terminal through a single DCI-based multiple TRP transmission method, and the terminal can receive the PDCCH based on the TCI state set through higher layer configuration information. You can. Additionally, the terminal can receive TCI-related information based on the DCI format included in the PDCCH. Based on the TCI-related information in the received DCI format, the terminal can check the beamforming information to be applied to the PDCCH and PDSCH to be received and the PUSCH and PUCCH to be transmitted after receiving the PDCCH.
  • the terminal can change/update the beam/beam information (e.g., TCI state) to be applied to PDCCH, PDSCH reception and/or PUSCH, PUCCH transmission after PDCCH reception based on TCI-related information in the received DCI format.
  • the beam/beam information e.g., TCI state
  • the beamforming information to be checked may be information of the TCI field based on DCI format 1_1 or DCI format 1_2 that has been used since before rel-17. At this time, a DL assignment that schedules DL data may or may not exist.
  • the confirmed beamforming information may indicate a plurality of joint/DL/UL TCI states to correspond to at least one CC and/or BWP or at least one CC and/or BWP set.
  • the size of the TCI field in the DCI may be 3 bits.
  • the joint DL state ID(s) and/or UL TCI state ID(s) (or unified TCI state) mapped to the codepoint value of the 3-bit TCI field may be combined in various ways according to the first embodiment described above.
  • the base station can reuse the MAC-CE message described above, and the maximum number of TCI states activated by the MAC-CE message can be maintained at 8 codepoints.
  • the interpretation of DCI information will first be described assuming that the size of the TCI field is 3 bits.
  • the base station may indicate to the UE one of the TCI-related information set using the previously described RRC and/or MAC CE through the TCI field of the PDCCH of a specific CORESET (e.g., the first CORESET).
  • the RRC and/or MAC CE information may set two TCI states or a single TCI state.
  • the terminal can check the transmission and reception beam based on TCI-related information (e.g., TCI state) corresponding to the codepoint of the indicated TCI field and apply it.
  • TCI states there are multiple (e.g., 2) TCI states corresponding to the codepoint value of the TCI field in the DCI
  • the following description focuses on examples of application to PDCCH, but the scope of the present disclosure is not limited thereto, and of course, it can also be applied to PDSCH/PUCCH/PUSCH.
  • TCI states e.g., 2
  • a method of using all indicated TCI states can be considered.
  • the terminal selects the first TCI state for reception of the PDCCH scheduled in the specific CORESET in which the PDCCH was received. can be applied, and the second TCI state can be applied for reception of PDCCH scheduled in another CORESET.
  • the terminal may detect/receive the PDCCHs scheduled in the first CORESET after receiving the PDCCH using the first TCI state, and use the first TCI state in another CORESET (e.g., the 2nd CORESET ) can be detected/received using the second TCI state.
  • another CORESET e.g., the 2nd CORESET
  • the TCI state may be applied according to the CORESET ID value set in the upper layer. For example, CORESET 0 may apply the first TCI state indicated by the codepoint value of the TCI field in the DCI, and CORESET 1 may apply the second TCI state indicated by the codepoint value of the TCI field in the DCI.
  • a CORESET with the same CORESET ID as the CORESET ID of the CORESET in which PDCCH beam change is indicated applies the first TCI state indicated by the codepoint value, and the remaining CORESET(s) apply the first TCI state indicated by the codepoint value.
  • the second TCI state can be applied.
  • the TCI state may be applied according to the CORESET group set and activated in the upper layer (RRC/MAC CE).
  • the CORESET group may be set by the CORESET group ID (CORESETgID) in the CORESET setting (e.g., ControlResourceSet IE) as described above in the first embodiment.
  • CORESETgID CORESET group ID
  • ControlResourceSet IE ControlResourceSet IE
  • the terminal applies the first TCI state to the PDCCH received based on the CORESET included in the first CORESET group, and applies the second TCI state to the PDCCH received based on the CORESET included in the second CORESET group. can do.
  • a CORESET group that includes a CORESET associated with the PDCCH indicating the TCI state(s) applies the first TCI state indicated by the codepoint value of the DCI field
  • another CORESET group applies the first TCI state indicated by the codepoint value of the DCI field.
  • the number of TCI states mapped to the codepoint of the TCI field indicated by the base station in the PDCCH of a specific CORESET is plural (e.g., 2), a method of using only a single TCI state among the indicated TCI states may be considered.
  • the UE can apply only a single TCI state to receive the PDCCH scheduled in a specific CORESET.
  • the single TCI state can be fixed as the first TCI state, or can be explicitly specified to apply the first or second TCI state in the RRC configuration.
  • the UE must ensure that the CORESET ID of the activated CORESET is the same as the CORESET (ID) on which the PDCCH is scheduled for PDCCH beam change. Then, the 1st TCI state indicated by the codepoint value can be applied in the activated CORESET.
  • the terminal sets the codepoint value of the DCI field for the corresponding CORESET (e.g., CORESET 0)
  • the first TCI state indicated by this can be applied.
  • the terminal sets the codepoint in the DCI field for the CORESET of the corresponding CORESET group. 1 st TCI state indicated by the value can be applied.
  • the CORESET group may be set by the CORESET group ID (CORESETgID) in the CORESET setting (eg, ControlResourceSet IE) as described above in the first embodiment.
  • the terminal may apply a single TCI state for reception of the PDCCH scheduled in the specific CORESET.
  • the DCI TCI field is 3 bits, but the DCI TCI field may be configured to have a size of 3 bits or more (e.g., 4 bits).
  • the joint DL state ID(s) and/or UL TCI state ID(s) (or unified TCI state) mapped to the codepoint value of the TCI field may have additional combinations corresponding to the first embodiment described above.
  • the base station may not support DCI format 1_1 used before rel-17 and may support only DCI format 1_2, or may support a new DCI format.
  • the base station may add some octects to the MAC-CE message described above, expanding the maximum number of TCI states activated by the MAC-CE message to 16 or more codepoints.
  • the TCI field may include additional information in addition to TCI state information.
  • the size of the DCI field is 4 bits is described as an example, but the scope of the present disclosure is not limited thereto, and of course, it may be composed of a larger number of bits.
  • the base station can indicate CORESETgID by the highest/lowest 1 bit information and unified TCI state information by the remaining 3 bits. If the value of the highest/lowest 1 bit of the TCI field indicated by the base station is 0, the terminal can check the TCI state corresponding to the codepoint value of the remaining 3 bits with CORESETgID being 0. If the value of the most significant/lowest bit of the TCI field indicated by the base station is 1, the terminal can check the TCI state corresponding to the codepoint value of the remaining 3 bits with CORESETgID being 1.
  • the base station when 1 bit is added to the conventional TCI field and it consists of 4 bits, the base station indicates the channel to which the TCI state is applied by the highest/lowest 1 bit information, and indicates unified TCI state information by the remaining 3 bits. can do. If the highest/lowest 1 bit value of the TCI field indicated by the base station is 0, this indicates one of PDCCH, PDSCH (e.g. PDCCH) or one of PUCCH and PUSCH (e.g. PUCCH), and the terminal uses the remaining 3 bits. You can check the TCI state corresponding to the codepoint value. If the highest/lowest 1 bit value of the TCI field indicated by the base station is 1, this indicates one of PDCCH and PDSCH (e.g. PDSCH) or one of PUCCH and PUSCH (e.g. PUSCH), and the terminal uses the remaining 3 bits. You can check the TCI state corresponding to the codepoint value.
  • the highest/lowest 1 bit value of the TCI field indicated by the base station is 1, this
  • the base station when 1 bit is added to the conventional TCI field and it consists of 4 bits, the base station indicates the channel unit to which the TCI state is applied by the highest/lowest 1 bit information, and unified TCI state information by the remaining 3 bits. You can instruct. If the highest/lowest 1 bit value of the TCI field indicated by the base station is 0, it indicates application of the TCI state to both PDCCH and PDSCH, and the terminal can check the TCI state corresponding to the codepoint value of the remaining 3 bits. there is. If the most significant/lowest bit value of the TCI field indicated by the base station is 1, it indicates application of the TCI state to one of PDCCH and PDSCH (e.g. PDSCH) or one of PUCCH and PUSCH (e.g. PUSCH). , the terminal can check the TCI state corresponding to the codepoint value of the remaining 3 bits.
  • the terminal can check the TCI state corresponding to the codepoint value of the remaining 3 bits.
  • TCI instruction application timing for receiving UE-specific PDCCH based on CORESET group On unified TCI framework extension for S-DCI based Multiple-TRP, how/when to apply to a TCI indication for UE-specific PDCCH)>
  • Figure 17 shows an example of applying/setting a TCI state to a PDCCH when a CORESET group is set according to an embodiment of the present disclosure.
  • Figure 17 shows an example in which the base station sets CORESET 0 (17-10) and CORESET 1 (17-20) in BWP #1 (17-00) and supports two Unified TCI states.
  • CORESETPoolindex is not set or CORESETPoolindex is set to 0.
  • Figure 17 shows PDCCH resources and omits the resources of the remaining channels (e.g., PDSCH, PUSCH, PUCCH) to explain in terms of the TCI states of the PDCCH, but this does not mean that there is no scheduling.
  • the base station and the terminal can assume that the TCI field information of the PDCCH scheduled in the same CORESET group within the same slot is based on the same TCI state.
  • the same CORESET group may mean a set of one or more CORESET(s) with the same CORESETgID.
  • the base station schedules PDCCH #3 at slot #2 in CORESET 0 (17-10) and CORESET 1 (17-20), which are composed of CORESET group #0 (17-50).
  • PDCCH #4 may indicate the same TCI information.
  • the same TCI information may mean that the codepoint of the TCI field has the same value.
  • the base station has PDCCH #3 and PDCCH #4 scheduled at slot #2 in CORESET 0 (17-10) and CORESET 1 (17-20) consisting of CORESET group #0 (17-50). Even if the codepoint value of the indicated TCI field is different, the spatial QCL information associated with the TCI state indicated by the codepoint may be the same.
  • the UE may not expect to perform different beamforming within the same CORESET group.
  • the base station may indicate the same TCI state information in common to the PDCCH being scheduled until before the beam application time for PDCCH. You can. For example, even if each PDCCH of CORESET(s) of the same CORESET group ID is scheduled at a different slot time, the UE uses the same TCI in the TCI field of the PDCCHs received before the beam application time for PDCCH. It can be assumed that state-related information is indicated.
  • the base station has PDCCH #2 scheduled at slot #1 in CORESET 0 (17-10) and CORESET 1 (17-20) consisting of CORESET group #0 (17-50).
  • the same TCI state-related information can be indicated from PDCCH #4, which is scheduled at slot #2, to the point of application of the beam application time of PDCCH #2 (e.g., assuming PDCCH #8).
  • the terminal receives PDCCH #2 scheduled at slot #1 from CORESET 0 (17-10) and CORESET 1 (17-20), which are composed of CORESET group #0 (17-50), checks the information in the TCI field, and , an ACK (acknowledgment) message corresponding to PDCCH #2 can be transmitted to the base station using PUCCH (not shown) at slot #2.
  • the terminal calculates the beam application time (e.g., 2 slots) based on the PUCCH transmission time, and PDCCH(s) indicated until PDCCH #6 of slot #4 (e.g., PDCCH #3, #4, #5) ) can be assumed to indicate the same TCI state related information as PDCCH #2.
  • the base station and the terminal can perform transmission and reception beamforming based on the information indicated by the final unfied TCI state from the beam application point (e.g., slot #4).
  • Figure 18 shows an example to explain a method of applying TCI state to PDCCH received in CORESETs with different CORESET group IDs set according to an embodiment of the present disclosure.
  • the base station and the terminal may assume that the information in the TCI field in the DCI scheduled in the CORESET with a different CORESET group ID within the same slot is the same.
  • the base station is CORESET 0 (18-10) consisting of CORESET group #0 (18-50), CORESET 2 (18-30), and CORESET group #1 (18-60).
  • PDCCH transmission can be scheduled at 1 (18-20).
  • PDCCH #2 and PDCCH #3 scheduled at slot #1 may indicate the same TCI state(s) information.
  • the same TCI state(s) information may mean that the codepoint of the TCI field is the same or that the codepoints of the TCI field are different but the TCI state(s) indicated by the codepoint are the same.
  • the base station can configure the same DCI and/or TCI information as above.
  • the base station and the terminal may assume that the information in the TCI field in the DCI scheduled in the CORESET with a different CORESET group ID within the same slot is different.
  • the base station is CORESET 0 (18-10) consisting of CORESET group #0 (18-50), CORESET 2 (18-30), and CORESET group #1 (18-60).
  • the TCI information indicated by PDCCH #6 and PDCCH #7 scheduling at slot #3 may schedule different TCI state(s) information.
  • different TCI state(s) information may mean that the codepoint value of the TCI field is the same, but the two TCI states corresponding to the codepoint are different, or the codepoint value of the TCI field is different.
  • the TCI field of the PDCCH scheduled until before the beam application time for PDCCH is different.
  • TCI state related information may be indicated.
  • the UE indicates different TCI state related information until the beam application time for PDCCH. It can be assumed that this happens.
  • the terminal may assume that the information in the TCI field of each PDCCH scheduled at different slot times in CORESET(s) with different CORESET group IDs is indicated independently.
  • the base station schedules PDCCH #2 at slot #1 in CORESET 0 (18-10) and CORESET 2 (18-30) consisting of CORESET group #0 (18-50).
  • the TCI state is indicated based on the TCI field information
  • the TCI state is indicated based on the TCI field information of PDCCH #3, which is scheduled at slot #1 in CORESET 1 (18-20) consisting of CORESET group #1 (18-60). can be instructed.
  • the terminal applies one of the two TCI states in response to CORESET 0 (18-10) of CORESET group #0 (18-50) , the remaining TCI state of the two can be applied in response to CORESET 2 (18-30), and one of the two TCI states can be applied in response to CORESET 1 (18-20).
  • the timing at which the unified TCI state is applied for PDCCH beam change is the first (or last) CORESET ID composed of each CORESET group (e.g.
  • the beam application time can be calculated based on the first (or last) PDCCH reception of the CORESET ID indicating PDCCH beam change (e.g., PDCCH #2 corresponding to CORESET group #0, #3 corresponding to CORESET group #1). there is.
  • the terminal applies one TCI state in response to CORESET 0 (18-10) of CORESET group #0 (18-50), The same TCI state can be applied in response to CORESET 2 (18-30), and one TCI state can be applied in response to CORESET 1 (18-20).
  • the timing of applying the unified TCI state for PDCCH beam change is based on the first (or last) CORESET ID composed of each CORESET group (e.g.
  • the beam application time can be calculated based on the first (or last) PDCCH reception of the CORESET ID indicating PDCCH beam change (e.g., PDCCH #2 corresponding to CORESET group #0, #3 corresponding to CORESET group #1). You can.
  • TCI state application combinations can be expanded by combining the first and second embodiments described above.
  • the embodiments and/or methods (e.g., the first embodiment, the second embodiment, the third embodiment, etc.) proposed in the present disclosure may be performed in combination with each other. Additionally, the operation of one embodiment may operate as part of another embodiment or may be performed by replacing some methods of another embodiment.
  • Figure 19 shows an example of a signaling flowchart of a terminal and a base station according to an embodiment of the present disclosure. 19 may be performed based on the above-described embodiments and/or methods (e.g., the first embodiment, the second embodiment, the third embodiment, etc.). Accordingly, when each step of FIG. 19 is performed, the above-described embodiments and/or methods (e.g., the first embodiment, the second embodiment, the third embodiment, etc.) may be referred to.
  • Figure 19 is only an example to aid understanding of the present disclosure and does not limit the scope of the present disclosure. The operation sequences in FIG. 19 may be changed. Additionally, in FIG. 19, some steps may be merged and performed as one step, or in some cases, some steps may be omitted.
  • the terminal can receive configuration information (e.g., ControlResourceSet IE) related to CORESET (S1910).
  • configuration information e.g., ControlResourceSet IE
  • the base station may transmit configuration information related to CORESET to the terminal.
  • the configuration information may be delivered through higher layer signaling (e.g., RRC).
  • the setting information may include a CORESET group identifier corresponding to each CORESET. Additionally, the setting information may include an index of the CORESET pool.
  • the base station can configure one or more CORESETs for the terminal based on the configuration information. For example, a first CORESET and a second CORESET may be set, and a CORESET group identifier may be set corresponding to each CORESET.
  • the terminal can identify the first CORESET associated with the first CORESET group and the second CORESET associated with the second CORESET group based on the CORESET group identifier (S1920).
  • the first CORESET group may correspond to the first TRP
  • the second CORESET group may correspond to the second TRP.
  • different CORESET group identifiers may be set for each of the first CORESET and the second CORESET, in which case a plurality of TCI states may be set for each of the first CORESET and the second CORESET through higher layer signaling. You can. If the same CORESET group identifier can be set for each of the first CORESET and the second CORESET, in this case, one TCI state can be set for each of the first CORESET and the second CORESET through higher layer signaling. .
  • one or more CORESET group identifiers may be set to correspond to each CORESET, and the number of TCI states supported in each CORESET can be confirmed based on the number of CORESET group identifiers.
  • CORESET with multiple CORESET group identifiers may support multiple TCI states.
  • the terminal can receive DCI (S1930).
  • the base station may transmit DCI to the terminal.
  • the DCI may include a TCI field.
  • the code point of the TCI field may correspond to one or multiple (e.g., 2) TCI states among the TCI states set for higher layer signaling (e.g., RRC, MAC-CE).
  • the TCI state indicated by the TCI field may be a unified TCI state for the uplink channel and downlink channel.
  • the TCI field may further include information about the CORESET group identifier or information about a physical channel to which the TCI state indicated by the TCI field is applied.
  • the DCI may be delivered through PDCCH.
  • the PDCCH including the DCI may be received based on either the first CORESET or the second CORESET.
  • the terminal can apply the TCI state indicated by the TCI field to the physical channel/signal to be received after receiving the PDCCH including the DCI (S1940).
  • the first TCI state among the plurality of TCI states is applied to the channel associated with the first CORESET and the second TCI state is applied to the channel associated with the first CORESET. It can be applied to the channel associated with the second CORESET.
  • the UE applies the first TCI state among the plurality of TCI states to the PDCCH received in the first CORESET, and applies the second TCI state to the PDCCH received in the first CORESET. Can be applied to the PDCCH received in the second CORESET.
  • the first TCI state among the plurality of TCI states is an uplink scheduled by the PDCCH received in the first CORESET. It can be applied to a channel (e.g., PUCCH, PUSCH), and the second TCI state can be applied to an uplink channel (e.g., PUCCH, PUSCH) scheduled by the PDCCH received in the second CORESET.
  • a channel e.g., PUCCH, PUSCH
  • an uplink channel e.g., PUCCH, PUSCH
  • the terminal may receive setting information about the search space. That is, the base station can transmit setting information about the search space to the terminal.
  • the configuration information may be delivered through higher layer signaling (e.g., RRC).
  • a CORESET associated with the search space may be confirmed based on setting information for the search space. Additionally, the terminal can determine the TCI state to apply in the search space based on the configuration information. For example, the terminal may apply the TCI state set in CORESET associated with the search space to the search space.
  • the terminal can check the first search space set associated with the first CORESET and the second search space set associated with the second CORESET. Additionally, the terminal can confirm that the first search space set and the second search space set are related.
  • the terminal may detect the PDCCH based on the TCI state set in CORESET corresponding to the search space set with a lower search space set identifier among the associated first search space set and the second search space set.
  • the terminal may detect the PDCCH based on the TCI status set in the CORESET with the lowest CORESET ID among the CORESETs corresponding to the associated search space sets.
  • ⁇ Fourth embodiment In the integrated TCI method based on multiple TRP and single DCI, application of TCI-related MAC-CE message for receiving UE-specific PDCCH (On unified MAC-CE message related to TCI framework extension for S-DCI based Multiple- TRP, how/when to apply to a TCI indication for UE-specific PDCCH)>
  • the base station can transmit a MAC-CE message instructing to appropriately apply the joint TCI state or separate TCI state set in RRC.
  • the indicated MAC-CE may be configured to associate each of a specific joint TCI state or DL TCI state / UL TCI state with the TCI field (e.g., information of 3 bits or more) included in a single DCI.
  • the base station can initially indicate basic TCI states information using the MAC-CE message. And by the base station additionally indicating a changed MAC-CE message, the terminal can set and update TCI states information.
  • Figure 20 shows one MAC-CE message among various embodiments, and bits size and octet length can be modified.
  • the information comprised by the MAC-CE message may include a serving cell ID, DL (Downlink) BWP ID, UL (Uplink) BWP ID, Pi field, D/U field, and TCI state ID preset in the upper layer.
  • the serving cell ID is 5 bits long and may mean cell information to which MAC CE information is applied.
  • the terminal can check the serving cell ID information and identify the primary cell (group), secondary cell(s) (group), etc., which are the cells to which the configured TCI information applies.
  • the DL BWP ID or UL BWP ID is 2 bits long and may mean a bandwidthpart ID to which MAC CE information is applied.
  • the terminal can check the DL BWP ID and UL BWP ID information to confirm the BWP-based frequency resource area to which the established TCI information is applied.
  • the Pi field may indicate whether the i-th codepoint of the TCI field in the DCI includes multiple TCI states or a single TCI state. For example, if the value of the Pi field is 1, the terminal may determine that the ith TCI codepoint value in the DCI includes the DL TCI state and the UL TCI state. Conversely, if the value of the Pi field is 0, it can be determined that the ith TCI codepoint value in the DCI includes only the DL TCI state or the UL TCI state.
  • the D/U field may indicate whether the TCI state ID in the same octet includes a joint/downlink TCI state or an uplink TCI state. For example, if the value of the D/U field is 1, the terminal may determine that the TCI state ID in the same octet indicates the TCI state for joint/downlink. Conversely, if the value of the D/U field is 0, the terminal may determine that the TCI state ID in the same octet indicates the TCI state for uplink.
  • the TCI state ID may include TCI state information confirmed by the TCI-StateID or UL-TCIState-Id set in RRC. If the D/U field described above is indicated as 1, the TCI state ID of the same octet is determined as one of the 7 bits of TCI-StateID , and if indicated as 0, the most significant bit (1 bit) is interpreted as a reserved bit. Therefore, it can be determined as one of the remaining 6 bits of UL-TCIState-Id .
  • the minimum number of activated TCI states is 8, and the maximum number is 16.
  • the MAC-CE message is configured to permanently set N pairs by configuring two TCI states into one pair, so a total of 2N TCI States IDs can be assigned.
  • the order of N pairs follows the codepoint order of TCI in DCI.
  • the first TCI state ID may include the default TCI state ID
  • the second TCI state ID may include the remaining TCI state ID.
  • default means linked to the lowest (lowest) CORESET (group) ID, default CORESET or odd CORESET ID
  • the rest means linked to the highest (highest) CORESET (group) ID, non-default CORESET(s) or This may mean linking to the even-numbered CORESET ID.
  • the MAC CE message has 2N fixed TCI state ID resources mapped, so when only one TCI state ID is set, the default TCI state ID is set, and the remaining TCI state IDs can be filled with 0.
  • the MAC-CE message may configure N TCI state IDs or 2N TCI state IDs according to the CORESET (group) ID value based on the RRC setting. For example, in RRC settings, the number of TCI State IDs indicated for CORESET(s) with the CORESET (group) ID value set to 0 is 2N (N pairs), and for CORESET (group) ID value set to 1, the number of TCI State IDs is 2N (N pairs). The number of TCI State IDs indicated in (s) may consist of N.
  • N TCI states can be set for this.
  • the values of CORESET (group) ID are set to 0 and 1, respectively, which is only an example, and may also be set to 1 and 0, respectively.
  • the order of the N pairs of 2N TCI state IDs may follow the codepoint order of the TCI within the DCI.
  • the first TCI state ID may include the default TCI state ID
  • the second TCI state ID may include the remaining TCI state ID.
  • default means linked to the lowest CORESET (group) ID, default CORESET or odd CORESET ID
  • the rest means linked to the highest CORESET (group) ID, non-default CORESET(s) or This may mean linking to the even-numbered CORESET ID.
  • the MAC CE message has 2N fixed TCI state ID resources mapped, so when only one TCI state ID is set, the default TCI state ID is set, and the remaining TCI state IDs can be filled with 0.
  • the MAC-CE message may indicate the CORESET (group) ID value as a separate resource based on the RRC configuration, and may include N TCI state IDs based on each CORESET (group) ID.
  • the base station sets the CORESET (group) ID of the CORESET(s) configured for TRP-A to 0 in the RRC configuration, and sets the CORESET (group) ID of the CORESET(s) configured for TRP-B to 1. You can set it.
  • the MAC-CE message uses 1 bit to indicate the CORESET (group) ID described above, and can indicate N TCI states according to each CORESET (group) ID.
  • the MAC-CE message can add a new parameter (C Y or C z ) using existing reserved bits.
  • the size of the C Y field may consist of 4 bits to 6 bits depending on the indicated type (for example, the size of the C Y field varies depending on the number of CORESETs).
  • the C Y field may indicate whether a CORESET with a CORESET ID value of Y includes a single TCI state or two or more TCI states. For example, if the C 1 field value is 0, N TCI states may be included in CORESET ID #0 (or the set minimum ID). Additionally, if the C 2 field value is 1, it can be understood that 2N TCI states are included in CORESET ID #1 (or the set minimum ID + 1). For example, the terminal checks the CORESET ID containing the PDCCH indicating the DCI information of the base station, and TCI state ID indicated by the codepoint of the TCI field of the corresponding DCI based on the C Y value confirmed in the MAC-CE message. You can finally check it.
  • the C z field may include whether TCI is activated for the purpose of indicating channels such as PDCCH/PDSCH/PUSCH/PUCCH in CORESET with a CORESET ID value of z.
  • the C 1 field value is 1000, it may mean that it is indicated to be applied only to PDCCH in CORESET ID #0 (or set minimum ID #1).
  • the C 2 field value is 1111, it may mean that it is indicated to be applied to all PDCCH/PDSCH/PUSCH/PUCCH in CORESET ID #1 (or set minimum ID #2).
  • the C 1 field value is 1, it may mean that it is instructed to be applied to PDSCH/PUSCH/PUCCH including PDCCH in CORESET ID #0 (or set minimum ID #1), and the C 2 field value is 1. If it is 0, it may mean that it is indicated to be applied to PDSCH/PUSCH/PUCCH excluding PDCCH in CORESET ID #1 (or set minimum ID #2).
  • the base station can transmit a MAC-CE message instructing to appropriately apply the joint TCI state or separate TCI stat set in RRC.
  • the indicated MAC-CE may be configured to associate each of a specific joint TCI state or DL TCI state / UL TCI state with the TCI field (e.g., information of 3 bits or more) included in a single DCI.
  • the base station can initially indicate basic TCI states information using the MAC-CE message. And by the base station additionally indicating a changed MAC-CE message, the terminal can set and update TCI states information. Afterwards, the terminal can transmit and receive simultaneous or sequential PDCCH, PDSCH, PUCCH, and PUSCH signals based on the DCI of the PDCCH transmitted by the base station.
  • the various embodiments described below correspond to 2 to 4 TCI states for some channels among a plurality of channels (e.g., PDCCH, PDSCH, PUCCH, PUSCH) based on the received extended MAC-CE message information.
  • a plurality of channels e.g., PDCCH, PDSCH, PUCCH, PUSCH
  • the base station and the terminal perform beamforming simultaneously or sequentially based on this. I would like to explain the decision operation of the TCI state ID for .
  • TCI states correspond to multiple CORESET groups based on the received extended MAC-CE message information
  • the base station and the terminal simultaneously or sequentially provide TCI for beamforming based on this. I would like to explain the decision operation of state ID.
  • the base station and the terminal perform beamforming simultaneously or sequentially based on this. I would like to explain the decision operation of the TCI state ID.
  • format and field definitions are needed so that the MAC-CE message indicates activation/deactivation of 2 to 4 TCI states.
  • the basic information of the expanded MAC-CE message may include the serving cell ID, DL (Downlink) BWP ID, UL (Uplink) BWP ID, Pi field, D/U field, and TCI state ID set in the upper layer. there is.
  • the serving cell ID is 5 bits long and refers to cell information to which MAC CE information is applied.
  • the terminal can check the serving cell ID information and identify the primary cell (group), secondary cell(s) (group), etc., which are the cells to which the set TCI information applies.
  • the DL BWP ID or UL BWP ID is 2 bits long and may mean a bandwidthpart ID to which MAC CE information is applied.
  • the terminal can check the DL BWP ID and UL BWP ID information to confirm the BWP-based frequency resource area to which the established TCI information is applied.
  • the D/U field may indicate whether the TCI state ID in the same octet includes a joint/downlink TCI state or an uplink TCI state.
  • the terminal can determine that the TCI state ID in the same octet indicates the TCI state for joint/downlink.
  • the terminal may determine that the TCI state ID in the same octet indicates the TCI state for uplink.
  • the TCI state ID may include TCI state information confirmed by the TCI-StateID or UL-TCIState-Id set in RRC. If the D/U field described above is indicated as 1, the TCI state ID of the same octet is determined as one of the 7 bits of TCI-StateID , and if indicated as 0, the most significant bit (1 bit) is interpreted as a reserved bit. Therefore, it can be determined as one of the remaining 6 bits of UL-TCIState-Id .
  • the minimum number of activated TCI states is 16, and the maximum number is 32.
  • the extended MAC-CE message may include a modified Pi field.
  • a modified Pi field In the following embodiment, an embodiment of modifying the Pi field is described, but expansion by adding a new field is not excluded.
  • the Pi field may be extended to 2 bits instead of 1 bit.
  • the ith codepoint of the TCI field in the DCI can be instructed to include up to 4 TCI states. You can.
  • the terminal may determine that the ith TCI codepoint value in the DCI corresponds to a total of 4 TCI state IDs (8 TCI states). there is.
  • TCI state ID field As shown in Table 19, in order to indicate 4 separate TCI states (maximum 8 TCI state IDs) according to the D/U value, the base station can set the UE to a mode to support separate TCI states in the RRC setting.
  • the terminal may not expect to transmit MAC-CE with a Pi field value of 00 as shown in Table 19 after the base station sets the mode to support the joint TCI state in the RRC configuration.
  • the terminal receives a MAC-CE containing the Pi field as shown below after the base station sets the mode to support the joint TCI state in the RRC configuration, it is temporarily or semi-periodically set to the mode to support the separate TCI state. It may be determined that it has changed.
  • the terminal when the terminal receives the PDCCH transmitted by the base station after receiving the MAC CE indicated as shown in Table 19, the ith codepoint of the TCI field in the DCI includes 4 TCI states. After checking, it can be determined that four TCI states are set simultaneously for one specific channel according to the PDSCH, PUCCH, PUSCH, etc. scheduled by the PDCCH.
  • the terminal after receiving the MAC CE indicated as shown in Table 19, when receiving the PDCCH transmitted by the base station, the terminal confirms that the i-th codepoint of the TCI field in the DCI includes 4 TCI states, and schedules by the PDCCH Depending on the PDSCH, PUCCH, PUSCH, etc., a certain number of 4 (e.g. 2) TCI states are simultaneously corresponded to one specific channel, and the remaining number (e.g. 2) of TCI states is corresponded to the remaining specific channel. can be judged to correspond.
  • 4 e.g. 2
  • the UE may confirm that the i-th codepoint of the TCI field in the DCI includes 4 TCI states when receiving the PDCCH transmitted by the base station after receiving the MAC CE indicated as shown in Table 19. And the terminal corresponds to a certain number of 4 (e.g. 2) TCI states simultaneously for one specific channel according to PDSCH, PUCCH, PUSCH, etc. scheduled by PDCCH, and transmits and receives other signals (e.g. SRS, For CSI-RS, SS/PBCH block), the remaining number (e.g., 2) of TCI states can be determined to correspond.
  • 4 e.g. 2
  • SRS For CSI-RS
  • the UE may confirm that the i-th codepoint of the TCI field in the DCI includes 4 TCI states when receiving the PDCCH transmitted by the base station after receiving the MAC CE indicated as shown in Table 19. And, according to the PDSCH, PUCCH, PUSCH, etc. scheduled by the PDCCH, the terminal corresponds to some number of TCI states (e.g., 2) out of 4 at the same time for one specific channel, and in cases such as retransmission or repeated transmission, It can be judged that it is set in advance for this purpose.
  • some number of TCI states e.g., 2 out of 4 at the same time for one specific channel, and in cases such as retransmission or repeated transmission, It can be judged that it is set in advance for this purpose.
  • the terminal that received the MAC-CE message shown in Table 19 receives one of DCI format 1_0, format 1_1, format 1_2, or a new format transmitted from the base station after a certain period of time, and the TCI codepoint value in the DCI is k,
  • TCI state ID k+1 (for DL only) corresponding to 1 can be applied.
  • the first PUCCH or the second PUCCH can be transmitted by applying TCI state ID k+1 (for UL only). Selection of the first PUCCH or second PUCCH resource may be determined according to RRC settings.
  • the terminal that has received the MAC-CE message shown in Table 19 will receive one of the DCI format 1_0, format 1_1, format 1_2, or new formats transmitted from the first TRP after a certain period of time. You can receive one.
  • the first PUCCH or the second PUCCH can be transmitted by applying TCI state ID k+1 (for UL only). Selection of the first PUCCH or second PUCCH resource may be determined according to RRC settings.
  • the terminal can receive one of DCI format 1_0, format 1_1, format 1_2, or a new format transmitted in the second TRP.
  • the 3rd PUCCH or 4th PUCCH can be transmitted by applying the corresponding TCI state ID k+3 (for UL only). Selection of the 3rd PUCCH or 4th PUCCH resource may be determined according to RRC settings.
  • the PDCCH can be received by applying TCI state ID k+1 (for DL only).
  • TCI state ID k+2 for DL
  • TCI state ID k+3 for DL only
  • the terminal has a total of 3 TCI state IDs (4 TCI states) as the ith TCI codepoint value in the DCI. It can be judged to correspond to .
  • TCI state ID field As shown in Table 20, in order to indicate one separate TCI state (up to two TCI state IDs) and one joint TCI state (one TCI state ID) according to the D/U value, the base station sends an RRC to the terminal. In the settings, you can set a mode that supports separate TCI state, joint TCI state, or both TCI states.
  • the terminal may not expect MAC-CE including the Pi field as shown in FIG. 21 to be transmitted after the base station sets the mode to support only one of the separate TCI state and joint TCI state in the RRC configuration. there is.
  • the UE when the UE receives a MAC-CE including a Pi field as shown in FIG. 21 after the base station sets the mode to support only one of the separate TCI state and the joint TCI state in the RRC configuration, one supported It can be determined that only the TCI state ID corresponding to the mode is applied. Specifically, after receiving the MAC CE indicated as shown in FIG.
  • the UE confirmed that the i-th codepoint of the TCI field in the DCI included 3 TCI states when receiving the PDCCH transmitted by the base station, but the PDSCH scheduled by the PDCCH,
  • PUCCH, PUSCH, and other signal transmission and reception e.g., SRS, CSI-RS, SS/PBCH block
  • only the TCI state based on the mode (e.g., separate or joint) set in RRC can be applied.
  • the terminal configures the MAC-CE including the Pi field as shown in FIG. 21 after the base station sets the mode (e.g., both) to support both the separate TCI state and the joint TCI state in the RRC configuration.
  • the DCI may determine that all TCI state IDs are applied through explicit or implicit signaling.
  • explicit signaling may mean that specific bit information within the DCI is indicated, and implicit signaling may mean indicated based on existing DCI signaling information without additional bit information.
  • the UE when receiving the PDCCH transmitted by the base station, the UE confirms that the i-th codepoint of the TCI field in the DCI includes 3 TCI states, and receives the PDSCH, PUCCH, and PUSCH scheduled by the PDCCH. Accordingly, for one specific channel, some number of TCI states (e.g. 1) out of 3 are corresponded at the same time, and for other signal transmission and reception (e.g. SRS, CSI-RS, SS/PBCH block), the remaining number (e.g. Example: 2) TCI states can be determined to correspond.
  • some number of TCI states e.g. 1 out of 3 are corresponded at the same time, and for other signal transmission and reception (e.g. SRS, CSI-RS, SS/PBCH block), the remaining number (e.g. Example: 2) TCI states can be determined to correspond.
  • the terminal that received the MAC-CE message with a Pi value of 01 receives DCI format 1_0, format 1_1, format 1_2, or a new format transmitted from the base station after a certain time.
  • the unified TCI state corresponding to joint TCI state ID k+1 can be applied. In this way, it can be extended and applied to beam configuration of repeated PUCCH.
  • the terminal that received the MAC-CE message with a Pi value of 01 receives one of DCI format 0_1, format 0_1, format 0_2, or a new format transmitted from the base station after a certain period of time. , At this time, it can be confirmed that the TCI codepoint value in DCI is k.
  • the UE transmits the TCI state ID k (for UL only), the unified TCI stat corresponding to joint TCI state ID k+1 can be applied for transmission of the first PUCCH and reception of the first PDCCH linked to the first PUCCH.
  • the terminal has a total of 3 TCI state IDs (4 TCI state IDs) as the ith TCI codepoint value in the DCI. It can be judged to correspond to TCI states.
  • TCI state ID field As shown in Table 21, in order to indicate one joint TCI state (one TCI state ID) and one separate TCI state (up to two TCI state IDs) according to the D/U value, the base station sends RRC to the terminal. In the settings, you can set a mode that supports separate TCI state, joint TCI state, or both TCI states. The following description can be extended in the same way as the Pi field value described above, with only the order being different from 01.
  • the UE sets the ith TCI codepoint value in the DCI to a total of 2 TCI state IDs (4 It can be judged to correspond to TCI states.
  • TCI state ID field As shown in Table 22, in order to indicate two joint TCI states (two TCI state IDs), the base station can set a mode that supports joint TCI state in the RRC configuration to the terminal.
  • the terminal may not expect the MAC-CE including the Pi field as shown in FIG. 21 to be transmitted after the base station sets the mode to support a separate TCI state in the RRC configuration.
  • the terminal receives a MAC-CE including a Pi field as shown in Figure 21 after the base station sets the mode to support a separate TCI state in the RRC setting, it temporarily or semi-periodically switches to a mode that supports the joint TCI state. It can be determined that the settings have been changed.
  • the terminal after receiving the MAC CE indicated as shown in FIG. 21, when receiving the PDCCH transmitted by the base station, the terminal confirms that the i-th codepoint of the TCI field in the DCI includes two joint TCI states, and Depending on other scheduled PDCCH, PDSCH, PUCCH, PUSCH, etc., it may be determined that two TCI states are set simultaneously for at least one specific channel.
  • the terminal after receiving the MAC CE indicated as shown in FIG. 21, when receiving the PDCCH transmitted by the base station, the terminal confirms that the i-th codepoint of the TCI field in the DCI includes two joint TCI states, and Depending on the scheduled PDSCH, PUCCH, PUSCH, etc., it may be determined that one TCI state corresponds to one specific channel at the same time, and the remaining one TCI state corresponds to the remaining specific channel.
  • the terminal after receiving the MAC CE indicated as shown in FIG. 21, when receiving the PDCCH transmitted by the base station, the terminal confirms that the i-th codepoint of the TCI field in the DCI includes two joint TCI states, and Depending on the scheduled PDSCH, PUCCH, PUSCH, etc., one TCI state corresponds to one specific channel, and the remaining TCI state corresponds to other signal transmission and reception (e.g. SRS, CSI-RS, SS/PBCH block). It can be judged that it is.
  • the terminal that received the MAC-CE message with a Pi value of 11 receives DCI format 1_0, format 1_1, format 1_2, or a new format transmitted from the base station after a certain time.
  • the TCI codepoint value in the DCI is k.
  • the terminal uses a unified TCI state corresponding to joint TCI state ID k for reception of the first PDCCH and joint TCI state ID k for reception of the second PDCCH.
  • unified TCI state corresponding to +1, joint TCI state for the first PUCCH transmission scheduled by the first PDCCH, unified TCI state corresponding to ID k, joint TCI state for the first PUCCH transmission scheduled by the second PDCCH The unified TCI state corresponding to ID k+1 can be applied.
  • the terminal receiving the MAC-CE message with a Pi value of 11 transmits DCI format 1_0, format 1_1, format 1_2, or a new format transmitted from the base station after a certain time.
  • the TCI codepoint value in the DCI is k.
  • the unified TCI state corresponding to joint TCI state ID k is applied, and when transmitting and receiving data channels scheduled by DCI (e.g. PDSCH, PUSCH), the joint The unified TCI state corresponding to TCI state ID k+1 can be applied.
  • FIG. 22 is a diagram illustrating an example to explain a method of applying TCI state in the case of single DCI-based multi-TRP transmission according to an embodiment of the present invention.
  • CORESETPoolindex may be unset or CORESETPoolindex may be set to 0.
  • the TCI state for Joint is set, and in the embodiment shown in FIG. 21, the terminal that has received the MAC-CE message with a Pi value of 11 receives PDCCH #1 transmitted from the base station after a certain period of time. (e.g. DCI format 1_0, format 1_1, format 1_2, or one of the new formats) can be received from TRP-A in slot #0.
  • the terminal can receive PDSCH #1 and PDSCH #1 ⁇ from a plurality of TRPs (e.g., TRP A and TRP B) in slot #1 based on the DCI information of PDCCH #1 received in slot #0. there is. Additionally, the UE may transmit PUCCH #1′ in slot #3 based on the TCI state for Joint and TCI state for UL.
  • TRPs e.g., TRP A and TRP B
  • FIG. 23 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • the terminal may include a transceiver (referring to the terminal receiver 2300 and the terminal transmitter 2310), a memory (not shown), and a terminal processing unit 2305 (or a terminal control unit or processor).
  • the terminal's transceiver units (2300, 2310), memory, and terminal processing unit (2305) can operate.
  • the components of the terminal are not limited to the examples described above.
  • the terminal may include more or fewer components than the aforementioned components.
  • the transceiver, memory, and processor may be implemented in the form of a single chip.
  • the transceiver units 2300 and 2310 can transmit and receive signals to and from the base station.
  • the signal may include control information and data.
  • the transceiver units 2300 and 2310 may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency.
  • this is only an example of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.
  • the transceiver units 2300 and 2310 may receive a signal through a wireless channel, output the signal to the processor, and transmit the signal output from the processor through the wireless channel.
  • the memory can store programs and data necessary for the operation of the terminal. Additionally, the memory can store control information or data included in signals transmitted and received by the terminal. Memory may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, there may be multiple memories.
  • the processor can control a series of processes so that the terminal can operate according to the above-described embodiment.
  • the processor may receive configuration information related to a CORESET, identify a first CORESET associated with a first CORESET group and a second CORESET associated with a second CORESET group, receive a DCI, and a TCI field included in the DCI. If the code point of corresponds to a plurality of TCI states, the first TCI state among the plurality of TCI states is applied to the channel associated with the first CORESET and the second TCI state is applied to the second CORESET and Components of the terminal can be controlled to apply to the associated channel.
  • the processor may perform a component control operation of the terminal by executing a program stored in the memory.
  • FIG. 24 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • the base station may include a base station receiver 2400, a transceiver unit referring to the base station transmitter 2410, a memory (not shown), and a base station processing unit 2405 (or a base station control unit or processor).
  • the base station's transceiver units 2400 and 2410, memory, and base station processing unit 2405 can operate.
  • the components of the base station are not limited to the above examples.
  • a base station may include more or fewer components than those described above.
  • the transceiver, memory, and processor may be implemented in the form of a single chip.
  • the transmitting and receiving units 2400 and 2410 can transmit and receive signals to and from the terminal.
  • the signal may include control information and data.
  • the transceiver units 2400 and 2410 may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency.
  • this is only an example of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.
  • the transceiver units 2400 and 2410 may receive a signal through a wireless channel, output the signal to the processor, and transmit the signal output from the processor through the wireless channel.
  • the memory can store programs and data necessary for the operation of the base station. Additionally, the memory may store control information or data included in signals transmitted and received by the base station. Memory may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, there may be multiple memories.
  • the processor can control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure.
  • the processor may control each component of the base station to transmit configuration information related to CORESET and transmit DCI including the TCI field to the terminal.
  • the configuration information related to the CORESET includes a CORESET group identifier corresponding to each CORESET, and if the code point of the TCI field included in the DCI corresponds to a plurality of TCI states, the plurality of TCI states
  • the first TCI state may be applied to the channel associated with the first CORESET and the second TCI state may be applied to the channel associated with the second CORESET.
  • There may be a plurality of processors, and the processor may perform a component control operation of the base station by executing a program stored in a memory.
  • a computer-readable storage medium that stores one or more programs (software modules) may be provided.
  • One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (configured for execution).
  • 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.
  • These programs include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM.
  • EEPROM Electrically Erasable Programmable Read Only Memory
  • magnetic disc storage device Compact Disc-ROM (CD-ROM: Compact Disc-ROM), Digital Versatile Discs (DVDs), or other types of It can be stored in an optical storage device or magnetic cassette. Alternatively, it may be stored in a memory consisting of a combination of some or all of these. Additionally, multiple configuration memories may be included.
  • the program can be accessed through a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a combination of these. It may be stored in an attachable storage device that can be accessed. This storage device can be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to the device performing an embodiment of the present disclosure.
  • a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a combination of these. It may be stored in an attachable storage device that can be accessed. This storage device can be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to the device performing an embodiment of the present disclosure.
  • each of the above embodiments can be operated in combination with each other as needed.
  • a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure and another embodiment.
  • parts of the first and second embodiments of the present disclosure may be combined to operate the base station and the terminal.
  • the above embodiments were presented based on the FDD LTE system, other modifications based on the technical idea of the above embodiments may be implemented in other systems such as a TDD LTE system, 5G or NR system.
  • drawings explaining the method of the present invention may omit some components and include only some components within the scope that does not impair the essence of the present invention.
  • the method of the present invention may be implemented by combining some or all of the content included in each embodiment within the range that does not impair the essence of the invention.

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente divulgation concerne un système de communication 5G ou 6G destiné à prendre en charge un débit supérieur de transmission de données. Un procédé mis en œuvre par un terminal dans un système de communication sans fil selon un mode de réalisation de la présente divulgation peut comprendre les étapes consistant à : recevoir des informations de configuration relatives à un ensemble de ressources de commande (CORESET), les informations de configuration comprenant un identifiant de groupe CORESET correspondant à chaque CORESET ; à identifier un premier CORESET associé à un premier groupe de CORESET et un second CORESET associé à un second groupe de CORESET sur la base de l'identifiant de groupe de CORESET ; recevoir un élément de commande (CE) de commande d'accès au support (MAC) étendu destiné à une activation/désactivation pour de multiples états d'indicateur de configuration de transmission (TCI), une valeur d'un premier champ étant configurée dans le CE MAC étendu, ou la longueur d'un second champ étant étendue ; recevoir des informations de liaison descendante (DCI) comprenant un champ TCI sur la base du premier CORESET et/ou du second CORESET ; et si un point de code du champ TCI correspond aux multiples états TCI, appliquer un premier état TCI parmi les multiples états TCI à un canal associé au premier CORESET, et appliquer un second état TCI à un canal associé au second CORESET.
PCT/KR2023/016907 2022-10-27 2023-10-27 Procédé et appareil de détermination de faisceau pour l'émission ou la réception d'informations de commande de liaison descendante dans un système de communication sans fil WO2024091072A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210007967A (ko) * 2018-05-11 2021-01-20 퀄컴 인코포레이티드 제어 리소스 세트 (coreset) 의 시그널링

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210007967A (ko) * 2018-05-11 2021-01-20 퀄컴 인코포레이티드 제어 리소스 세트 (coreset) 의 시그널링

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Title
CATT: "On unified TCI framework extension for multi-TRP operation", 3GPP TSG RAN WG1 #109-E, R1-2203441, 29 April 2022 (2022-04-29), XP052152973 *
QUALCOMM INCORPORATED: "Extended MAC CE ID", 3GPP TSG-RAN WG2 MEETING #108, R2-1915808, 7 November 2019 (2019-11-07), XP051816092 *
TRANSSION HOLDINGS: "Discussion on unified TCI framework extension for multi-TRP", 3GPP TSG RAN WG1#110B-E, R1-2209165, 30 September 2022 (2022-09-30), XP052277083 *
VIVO: "Views on unified TCI framework extension for multi-TRP", 3GPP TSG RAN WG1 #109-E, R1-2203541, 29 April 2022 (2022-04-29), XP052153016 *

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