WO2022260498A1 - Procédé et dispositif de transmission et de réception d'informations de commande de liaison descendante et de données dans un système de communication sans fil - Google Patents

Procédé et dispositif de transmission et de réception d'informations de commande de liaison descendante et de données dans un système de communication sans fil Download PDF

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WO2022260498A1
WO2022260498A1 PCT/KR2022/008270 KR2022008270W WO2022260498A1 WO 2022260498 A1 WO2022260498 A1 WO 2022260498A1 KR 2022008270 W KR2022008270 W KR 2022008270W WO 2022260498 A1 WO2022260498 A1 WO 2022260498A1
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pdcch
pdsch
terminal
transmission
resource
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PCT/KR2022/008270
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English (en)
Korean (ko)
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장영록
체가예 아베베아메하
임성목
지형주
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삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • 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
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • 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

  • the present disclosure relates generally to wireless communication systems, and more particularly to methods and apparatus for transmitting and receiving downlink control information and data in wireless communication systems.
  • 5G communication system or pre-5G communication system Efforts are being made to develop an improved 5th generation (5G) communication system or a pre-5G communication system in order to meet the growing demand for wireless data traffic after the commercialization of a 4G (4th generation) communication system. For this reason, the 5G communication system or pre-5G communication system has been called a Beyond 4G Network communication system or a Post LTE system.
  • the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band).
  • a mmWave band eg, a 60 gigabyte (60 GHz) band.
  • beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems.
  • array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
  • an evolved small cell an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network
  • D2D Device to Device communication
  • wireless backhaul moving network
  • cooperative communication CoMP (Coordinated Multi-Points), and reception interference cancellation etc.
  • ACM Advanced Coding Modulation
  • FQAM Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation
  • SWSC Small Cell Superposition Coding
  • FBMC Flexible Bank Multi Carrier
  • NOMA Non Orthogonal Multiple Access
  • SCMA Sparse Code Multiple Access
  • the present disclosure provides a method and apparatus for transmitting and receiving downlink control information and data in a wireless communication system.
  • a process of transmitting terminal capability information including information related to repeated physical downlink control channel (PDCCH) reception to a base station, and repeated PDCCH from the base station Receiving PDCCH configuration information including terminal information related to transmission, and receiving SFN configuration information related to multiple transmission reception point (TRP) based system frame number (SFN) PDCCH reception and multiple TRP based SFN PDSCH reception from a base station
  • TRP transmission reception point
  • SFN system frame number
  • a process of receiving terminal capability information including information related to repeated physical downlink control channel (PDCCH) transmission from a terminal, and repeating PDCCH to the terminal A process of transmitting PDCCH configuration information including base station information related to transmission, and transmitting SFN configuration information related to multiple TRP (transmission reception point) based SFN (system frame number) PDCCH transmission and multiple TRP based SFN PDSCH transmission to the UE
  • PDCCH configuration information including base station information related to transmission
  • PDSCH physical downlink shared channel
  • a terminal in a wireless communication system, a terminal including a transceiver and at least one processor, wherein the at least one processor is configured to perform a method of operating a terminal according to various embodiments of the present disclosure Provided.
  • a terminal including a transceiver and at least one processor, wherein the at least one processor is configured to perform a method of operating a base station according to various embodiments of the present disclosure Provided.
  • Various embodiments of the present disclosure provide a method and apparatus for transmitting and receiving downlink control information and data in a wireless communication system.
  • FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 2A illustrates a basic structure of a time-frequency domain, which is a radio resource domain in which a data or control channel is transmitted in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 2B illustrates a slot structure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 3 illustrates an example of setting a bandwidth portion in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 4 illustrates an example of setting a control region of a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • 5A illustrates an example of a structure of a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • 5B illustrates an example of a case in which a terminal may have a plurality of PDCCH monitoring positions within a slot in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 6 illustrates an example of a DRX operation in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 7 illustrates an example of base station beam allocation according to TCI state setting in a wireless communication system according to various embodiments of the present disclosure.
  • FIG 8 illustrates an example of TCI state allocation for a PDCCH in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 9 illustrates an example of a TCI indicating MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 10 illustrates an example of beam configuration of a control resource set and a search space in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 11 illustrates an example of a method in which a base station and a terminal transmit and receive data in consideration of a downlink data channel and a rate matching resource in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 12 illustrates an example of a method for selecting a receivable control resource set in consideration of priority when a terminal receives a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 13 illustrates an example of frequency axis resource allocation of a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 14 illustrates an example of time axis resource allocation in a wireless communication system according to various embodiments of the present disclosure.
  • 15 illustrates an example of time axis resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to various embodiments of the present disclosure.
  • 16 illustrates an example of beam configuration and activation of a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 17 illustrates an example of a PUSCH repetitive transmission type in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 18 illustrates an example of a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 19 illustrates an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to various embodiments of the present disclosure.
  • DCI downlink control information
  • FIG. 21 illustrates an example of an enhanced PDSCH TCI state activation/deactivation MAC-CE (enhanced PDSCH TCI state activation/deactivation MAC-CE) structure in a wireless communication system according to various embodiments of the present disclosure.
  • enhanced PDSCH TCI state activation/deactivation MAC-CE enhanced PDSCH TCI state activation/deactivation MAC-CE
  • FIG. 22 illustrates an example of an RLM RS selection process in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 23 illustrates an example of a process of generating a PDCCH repeatedly transmitted through two TRPs in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 24 illustrates an example of a multi-TRP based PDSCH SFN transmission method in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 25 illustrates an example of an enhanced PDCCH TCI state activation/deactivation MAC-CE (enhanced PDCCH TCI state activation/deactivation MAC-CE) structure in a wireless communication system according to various embodiments of the present disclosure.
  • enhanced PDCCH TCI state activation/deactivation MAC-CE enhanced PDCCH TCI state activation/deactivation MAC-CE
  • 26A illustrates an example of a terminal operation for primary beams of a PDCCH and a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • 26B illustrates an example of an operation of a base station for primary beams of a PDCCH and a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • 27A illustrates an example of a structure of a terminal in a wireless communication system according to various embodiments of the present disclosure.
  • 27B illustrates an example of a structure of a base station in a wireless communication system according to various embodiments of the present disclosure.
  • the present disclosure describes embodiments for transmitting and receiving downlink control information and data in a wireless communication system, but is not limited to each embodiment and applies to all or part of one or more embodiments proposed in the present disclosure. It may also be possible to use a combination of the examples for a frequency resource setting method corresponding to another channel. Therefore, the embodiments of the present disclosure can be applied through some modifications within a range that does not significantly deviate from the scope of the present disclosure as determined by a person having skilled technical knowledge.
  • the wireless communication system has moved away from providing voice-oriented services in the early days and, for example, 3GPP's high speed packet access (HSPA), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's high rate packet data (HRPD), UMB (ultra mobile broadband), and IEEE's 802.17e. evolving into a communication system.
  • HSPA high speed packet access
  • LTE long term evolution or E-UTRA (evolved universal terrestrial radio access)
  • LTE-A LTE-Advanced
  • LTE-Pro LTE-Pro
  • HRPD high rate packet data
  • UMB ultra mobile broadband
  • IEEE's 802.17e evolving into a communication system.
  • Uplink refers to a radio link in which a user equipment (UE) or mobile station (MS) transmits data or control signals to a base station (eNode B (eNB) or base station (BS)), and downlink refers to a base station It means a radio link that transmits data or control signals to this terminal.
  • eNB base station
  • BS base station
  • the above-described multiple access scheme distinguishes data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap each other, that is, to establish orthogonality. Let it be.
  • the 5G communication system which is a communication system after LTE, must support services that simultaneously satisfy various requirements so that various requirements such as users and service providers can be freely reflected.
  • Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra reliability low latency communication (URLLC), etc.
  • eMBB aims to provide a data transmission rate that is more improved than that supported by existing LTE, LTE-A or LTE-Pro.
  • an eMBB in a 5G communication system, an eMBB must be able to provide a peak data rate of 20 Gbps in downlink and a peak data rate of 10 Gbps in uplink from the perspective of one base station.
  • the 5G communication system should provide the maximum transmission rate and at the same time provide the user perceived data rate of the increased terminal.
  • various transmission/reception technologies may be improved, including a more advanced multi-input multi-output (MIMO) transmission technology.
  • MIMO multi-input multi-output
  • the 5G communication system uses a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or higher, thereby increasing the data transmission rate required by the 5G communication system.
  • 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 access support for large-scale terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal cost. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km2) in a cell.
  • UEs supporting mMTC are likely to be located in shadow areas that are not covered by cells, such as the basement of a building due to the nature of the service, so they require wider coverage than other services provided by the 5G communication system.
  • a terminal supporting mMTC must be configured as a low-cost terminal, and requires a very long battery life time such as 10 to 16 years because it is difficult to frequently change the battery of the terminal.
  • URLLC it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, and emergency situations. A service used for emergency alert or the like may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy air interface latency of less than 0.5 milliseconds, and at the same time must satisfy requirements of a packet error rate of 10-5 or less. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time allocate wide resources in the frequency band to secure the reliability of the communication link.
  • TTI transmit time interval
  • Three services of the 5G communication system (hereinafter, it can be mixed with the 5G system), that is, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable and low-latency communications
  • mMTC massive machine type communications
  • FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure.
  • 1 illustrates a base station 100, a terminal 120, and a terminal 130 as some of nodes using a radio channel in a wireless communication system.
  • FIG. 1 shows only one base station, other base stations identical to or similar to the base station 100 may be further included.
  • Base station 100 is a network infrastructure that provides wireless access to terminals 120 and 130 .
  • the base station 100 has coverage defined as a certain geographical area based on a distance over which signals can be transmitted.
  • the base station 110 includes 'access point (AP)', 'eNodeB (eNB)', '5G node (5th generation node)', 'next generation nodeB (next generation nodeB)' in addition to the base station.
  • AP access point
  • eNB 'eNodeB
  • gNB 'wireless point'
  • TRP transmission/reception point
  • Each of the terminal 120 and terminal 130 is a device used by a user and communicates with the base station 100 through a radio channel. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without user involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by a user.
  • MTC machine type communication
  • Each of the terminal 120 and terminal 130 is a 'user equipment (UE)', a 'mobile station', a 'subscriber station', a 'remote terminal' other than a terminal. )', 'wireless terminal', 'user device', or other terms having an equivalent technical meaning.
  • the base station 100, terminal 120, and terminal 130 may transmit and receive wireless signals in a mmWave band (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz).
  • a mmWave band eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz.
  • the base station 100, the terminal 120, and the terminal 130 may perform beamforming.
  • beamforming may include transmit beamforming and receive beamforming. That is, the base station 100, the terminal 120, and the terminal 130 may give directivity to a transmitted signal or a received signal.
  • the base station 100 and the terminals 120 and 130 may select serving beams 112, 113, 121 and 131 through a beam search or beam management procedure. .
  • communication may be performed through a resource having a quasi co-located (QCL) relationship with a resource transmitting the serving beams 112, 113, 121, and 131.
  • QCL quasi co-located
  • the first antenna port and the second antenna port are said to be in a QCL relationship.
  • a wide range of properties are delay spread, doppler spread, doppler shift, average gain, average delay, spatial receiver parameter may include at least one of them.
  • FIG. 2A illustrates a basic structure of a time-frequency domain, which is a radio resource domain in which a data or control channel is transmitted in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 2A is a diagram showing a basic structure of a time-frequency domain, which is a radio resource domain of a 5G system.
  • the horizontal axis 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 one orthogonal frequency division multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) on the time axis. (102) and one subcarrier (103) in the frequency axis.
  • OFDM orthogonal frequency division multiplexing
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • N SC RBs eg, 12
  • N symb subframe consecutive OFDM symbols in the time domain may constitute one subframe (110).
  • FIG. 2B illustrates a slot structure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 2B is a diagram illustrating a slot structure considered in a 5G system.
  • FIG. 2B shows an example of a structure of a frame 200, a subframe 201, and a slot 202.
  • One frame 200 may be defined as 10 ms.
  • One subframe 201 may be defined as 1 ms, and thus one frame 200 may consist of a total of 10 subframes 201 .
  • One subframe 201 may be composed of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 is a set value for the subcarrier interval, ⁇ (204). , 205).
  • N slot subframe, ⁇ and N slot frame, ⁇ according to each subcarrier interval setting ⁇ can be defined as [Table 1] below.
  • DMRS demodulation reference signal
  • DMRS may consist of several DMRS ports, and each port uses code division multiplexing (CDM) or frequency division multiplexing (FDM) to maintain orthogonality so as not to interfere with each other.
  • CDM code division multiplexing
  • FDM frequency division multiplexing
  • the terms for the DMRS may be expressed in other terms depending on the user's intention and the purpose of using the reference signal. More specifically, the term DMRS is only presented as a specific example to easily explain the technical content of the present disclosure and help understanding of the present disclosure, and is not intended to limit the scope of the present disclosure. That is, it is obvious to those of ordinary skill in the art that the technical idea of the present disclosure can be implemented even for reference signals.
  • bandwidth part (BWP) setting in the 5G communication system will be described in detail with reference to the drawings.
  • bandwidth part # 1 bandwidth part # 1 (BWP # 1) 301
  • bandwidth part # 2 bandwidth part # 2 (BWP # 2) 302.
  • the base station may set one or a plurality of bandwidth parts to the terminal, and may set the following information for each bandwidth part.
  • the information may be transmitted 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 part among one or a plurality of set bandwidth parts may be activated. Whether or not the set bandwidth portion is activated may be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through downlink control information (DCI).
  • DCI downlink control information
  • a terminal prior to RRC (Radio Resource Control) connection may receive an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, in the initial access step, the terminal receives system information (remaining system information; RMSI or System Information Block 1; may correspond to SIB1) necessary for initial access through the MIB.
  • PDCCH for receiving can be transmitted Setting information on a control resource set (CORESET) and a search space may be received.
  • the control area and search space set by MIB can be regarded as identity (ID) 0, respectively.
  • the base station may notify the terminal of setting information such as frequency allocation information, time allocation information, and numerology for the control region #0 through the MIB.
  • the base station may notify the terminal of configuration information about the monitoring period and occasion for control region #0, that is, configuration information about search space #0, through the MIB.
  • the terminal may regard the frequency domain set as the control domain #0 acquired from the MIB as an initial bandwidth part for initial access.
  • the identifier (ID) of the initial bandwidth part may be regarded as 0.
  • the setting for the portion of the bandwidth supported by 5G can be used for various purposes.
  • the base station when the bandwidth supported by the terminal is smaller than the system bandwidth, it can be supported through the bandwidth portion setting.
  • the base station can transmit and receive data at a specific frequency position within the system bandwidth by setting the frequency position (configuration information 2) of the bandwidth part to the terminal.
  • the base station may set a plurality of bandwidth parts 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 15 kHz and a subcarrier spacing of 30 kHz to a terminal, two bandwidth parts may be set to subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth portion set at a corresponding subcarrier interval may be activated.
  • the base station may set bandwidth parts having different bandwidths to the terminal. For example, when a terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz and always transmits and receives data with the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a non-traffic situation may be very inefficient in terms of power consumption.
  • the base station may set a bandwidth part of a relatively small bandwidth, for example, a bandwidth part of 20 MHz for the terminal. In a situation where there is no traffic, the terminal can perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it can transmit and receive data in the 100 MHz bandwidth part according to the instructions of the base station.
  • terminals before RRC connection can receive setting information on the initial bandwidth part (Initial Bandwidth Part) through a Master Information Block (MIB) in an initial access step. More specifically, the terminal is a control region (Control Resource Set, CORESET) can be set.
  • the bandwidth of the control region set by the MIB may be regarded as an initial bandwidth portion, and the UE may receive a physical downlink shared channel (PDSCH) through which the SIB is transmitted through the initial bandwidth portion set.
  • the initial bandwidth portion may be used for other system information (Other System Information, OSI), paging, and random access in addition to the purpose of receiving the SIB.
  • OSI System Information
  • the base station may instruct the terminal to change (or switch, transition) the bandwidth part using a bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently active bandwidth part of the terminal is bandwidth part #1 301, the base station may instruct the terminal with the bandwidth part #2 302 as a bandwidth part indicator in the DCI, and the terminal receives The bandwidth part change can be performed with the bandwidth part #2 302 indicated by the bandwidth part indicator in the DCI.
  • the DCI-based bandwidth part change can be indicated by the DCI that schedules the PDSCH or PUSCH
  • the PDSCH or PUSCH scheduled by the corresponding DCI is grouped in the changed bandwidth part. It must be possible to receive or transmit without to this end, the standard stipulates the requirements for the delay time (TBWP) required when changing the bandwidth part, and may be defined as follows, for example.
  • FIG. 4 illustrates an example of setting a control region of a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 4 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.
  • CORESET Control Resource Set
  • 4 shows a UE bandwidth part 410 on the frequency axis and two control regions (control region # 1 401 and control region # 2 402) within 1 slot 420 on the time axis. Shows an example of what has been done.
  • the control regions 401 and 402 may be set to a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis.
  • the time axis may be set to one or a plurality of OFDM symbols, and this may be defined as a control region length (Control Resource Set Duration, 404).
  • control region #1 (401) is set to a control region length of 2 symbols
  • control region #2 (402) is set to a control region length of 1 symbol.
  • the control region in the aforementioned 5G may be set by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling).
  • Setting the control region to the terminal means providing information such as a control region identifier (Identity), a frequency location of the control region, and a symbol length of the control region. For example, it may include the following information.
  • tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information is one or more SS (Synchronization signal)/PBCH (Physical Broadcast Channel) block index or CSI-RS (Channel State Information Reference Signal) index information.
  • SS Synchronization signal
  • PBCH Physical Broadcast Channel
  • CSI-RS Channel State Information Reference Signal
  • FIG. 5A illustrates an example of a structure of a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 5A is a diagram showing an example of basic units of time and frequency resources constituting a downlink control channel that can be used in 5G.
  • a basic unit of time and frequency resources constituting a control channel can be referred to as a REG (Resource Element Group, 503), and the REG 503 is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis.
  • (Physical Resource Block, 502) that is, it can be defined as 12 subcarriers.
  • the base station may configure a downlink control channel allocation unit by concatenating the REGs 503.
  • one CCE 504 may be composed of a plurality of REGs 503.
  • the REG 503 may consist of 12 REs, and if 1 CCE 504 consists of 6 REGs 503, 1 CCE 504 may consist of 72 REs.
  • the corresponding region can be composed of a plurality of CCEs 504, and a specific downlink control channel is divided into one or a plurality of CCEs 504 according to an aggregation level (AL) in the control region. It can be mapped and transmitted.
  • the CCEs 504 in the control area are identified by numbers, and at this time, the numbers of the CCEs 504 may be assigned according to a logical mapping method.
  • the basic unit of the downlink control channel may include both REs to which DCI is mapped and a region to which the DMRS 505, which is a reference signal for decoding them, is mapped.
  • three DMRSs 505 may be transmitted within one REG 503.
  • 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 UE should attempt to decode on a given aggregation level, and various aggregations that make one group with 1, 2, 4, 8, and 16 CCEs Since there are levels, the terminal can have a plurality of search spaces.
  • a search space set may be defined as a set of search spaces at all set aggregation levels.
  • the search space can be classified into a common search space and a UE-specific search space.
  • a certain group of terminals or all terminals can search the common search space of the PDCCH in order to receive cell-common control information such as dynamic scheduling for system information or a paging message.
  • cell-common control information such as dynamic scheduling for system information or a paging message.
  • PDSCH scheduling allocation information for SIB transmission including cell operator information may be received by examining the common search space of the PDCCH.
  • a common search space since a certain group of terminals or all terminals must receive the PDCCH, it can be defined as a set of pre-promised CCEs.
  • Scheduling assignment information for the UE-specific PDSCH or PUSCH may be received by examining the UE-specific search space of the PDCCH.
  • the UE-specific search space may be defined UE-specifically as a function of the identity of the UE and various system parameters.
  • a parameter for a search space for a PDCCH may be configured from a base station to a terminal through higher layer signaling (eg, SIB, MIB, RRC signaling).
  • the base station includes the number of PDCCH candidate groups at each aggregation level L, a monitoring period for the search space, a monitoring occasion in symbol units within a slot for the search space, a search space type (common search space or UE-specific search space),
  • a combination of a DCI format and an RNTI to be monitored in the corresponding search space, a control region index to be monitored in the search space, and the like may be set to the terminal. For example, it may include the following information.
  • the base station may set one or a plurality of search space sets for the terminal.
  • the base station may set search space set 1 and search space set 2 to the terminal, set DCI format A scrambled with X-RNTI in search space set 1 to be monitored in a common search space, and search DCI format B scrambled with Y-RNTI in space set 2 can be configured to be monitored in a UE-specific search space.
  • one or a plurality of search space sets may exist in a common search space or a 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.
  • a combination of the following DCI format and RNTI may be monitored.
  • DCI format a combination of the following DCI format and RNTI.
  • RNTI a combination of the following DCI format and RNTI.
  • the specified RNTIs may follow the following definitions and uses.
  • 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 Interruption RNTI: used to inform whether pucturing for PDSCH
  • 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 region p and the search space set s can be expressed as in [Equation 1] below.
  • a value of Yp,n ⁇ s,f may correspond to 0 in the case of a common search space.
  • the Yp,n ⁇ s ,f values may correspond to values that change according to the identity of the UE (C-RNTI or an ID set for the UE by the base station) and a time index.
  • the set of search space sets monitored by the terminal at each point in time may be different. For example, if search space set #1 is set to an X-slot period and search space set #2 is set to a Y-slot period and X and Y are different, the terminal searches search space set #1 and search space set #1 in a specific slot. All space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.
  • the terminal may perform a terminal capability report for the case of having a plurality of PDCCH monitoring positions within a slot for each subcarrier interval, and in this case, the concept of span may be used.
  • a span means consecutive symbols in which a terminal can monitor a PDCCH within a slot, and each PDCCH monitoring position is within one span.
  • a span can be expressed as (X,Y), where x means 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 UE can monitor the PDCCH in a section within Y symbols from the first symbol of Span within Span.
  • FIG. 5B illustrates an example of a case in which a terminal may have a plurality of PDCCH monitoring positions within a slot in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 5B is a diagram illustrating a case where a terminal can have a plurality of PDCCH monitoring positions in a slot in a wireless communication system through Span.
  • Span (511) represents the case where there are two spans in a slot that can be expressed as (7,4).
  • Terminal capability 1 (hereinafter referred to as FG (feature group) 3-1).
  • FG feature group 3-1
  • MO monitoring occasion MO
  • the corresponding MO location is the slot It means the ability to monitor the corresponding MO when located within the first 3 symbols within.
  • This UE capability is a mandatory capability that all UEs supporting NR must support, and whether or not this capability is supported is not explicitly reported to the base station.
  • FG 3-2 Terminal capability 2
  • MO monitoring occasion MO
  • This terminal capability can be selectively supported by the terminal (optional), and whether or not this capability is supported is explicitly reported to the base station.
  • the UE capability indicates a pattern of MOs that can be monitored by the UE when a plurality of monitoring occasions (MOs) exist in a slot for a common search space or a UE-specific search space. do.
  • the above-described pattern consists of a starting inter-symbol interval X between different MOs and a maximum symbol length Y for one MO.
  • the combination of (X,Y) supported by the terminal may be one or a plurality of ⁇ (2,2), (4,3), (7,3) ⁇ . This terminal capability can be selectively supported by the terminal (optional), and whether or not this capability is supported and the above-described (X,Y) combination are explicitly reported to the base station.
  • the UE may report whether or not to support UE capability 2 and/or UE capability 3 and related parameters to the BS.
  • the base station may perform time axis resource allocation for a common search space and a terminal-specific search space based on the reported terminal capabilities. When allocating the resource, the base station may prevent the terminal from locating the MO in a position where monitoring is impossible.
  • the following conditions may be considered in a method for determining a search space set to be monitored by a terminal.
  • the UE can monitor the number of PDCCH candidate groups that can be monitored and the total search space (here, the total search space is the number corresponding to the union area of a plurality of search space sets).
  • the maximum value for the number of CCEs constituting the entire CCE set) is defined for each slot, and if the value of monitoringCapabilityConfig-r16 is set to r16monitoringcapability, the UE determines the number of PDCCH candidates that can be monitored and the total search space (
  • the total search space means the entire set of CCEs corresponding to the union area of a plurality of search space sets).
  • the maximum value for the number of CCEs constituting each span is defined.
  • C ⁇ 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) according to the setting value of higher layer signaling, is a subcarrier [Table 8-3] follows when defined on a slot basis in a cell set to 15 ⁇ 2 ⁇ kHz interval, and [Table 8-4] below when defined on a span basis.
  • condition A a situation in which both conditions 1 and 2 are satisfied at a specific point in time is defined as “condition A”. Accordingly, not satisfying condition A may mean not satisfying at least one of conditions 1 and 2 above.
  • condition A may occur at a specific point in time.
  • the terminal may select and monitor only a part of search space sets configured to satisfy condition A at that time point, and the base station may transmit a PDCCH to the selected search space set.
  • condition A for the PDCCH is not satisfied at a specific time point (slot)
  • the UE or the base station selects a search space set whose search space type is set to a common search space among search space sets existing at that time point.
  • - Priority can be given to a search space set set as a specific search space.
  • the terminal (or the base station) terminal-specific search space Search space sets set to can be selected.
  • a search space set having a lower search space set index may have a higher priority.
  • UE-specific search space sets may be selected within a range satisfying condition A.
  • one or more different antenna ports (or one or more channels, signals, and combinations thereof may be substituted, but in the future description of the present disclosure, for convenience, different antenna ports are collectively referred to) They can be associated with each other by setting Quasi co-location (QCL) as shown in [Table 10] below.
  • QCL Quasi co-location
  • the TCI state is to notify the QCL relationship between a PDCCH (or PDCCH DMRS) and another RS or channel.
  • a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCL QCLed means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated from the antenna port A to channel measurement from the antenna port B.
  • QCL is 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, 4) spatial parameter It may be necessary to associate different parameters depending on circumstances such as affected beam management (BM). Accordingly, NR supports four types of QCL relationships as shown in [Table 9] below.
  • the spatial RX parameter includes various parameters such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, and spatial channel correlation. Some or all of them may be generically named.
  • 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 Some or all of them may be generically named.
  • the QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in [Table 10] below.
  • the base station sets one or more TCI states to the UE and informs 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 of the TCI states includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in [Table 9] above. includes
  • FIG. 6 illustrates an example of a DRX operation in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 6 is a diagram for explaining DRX (Discontinuous Reception).
  • DRX Discontinuous Reception
  • a terminal using a service discontinuously receives data in an RRC Connected state in which a radio link is established between a base station and a terminal.
  • the terminal can turn on the receiver at a specific time point to monitor the control channel, and turn off the receiver when there is no data received for a certain period of time to reduce power consumption of the terminal.
  • DRX operation can be controlled by the MAC layer device based on various parameters and timers.
  • Active time 605 is the time when the UE wakes up every DRX cycle and monitors the PDCCH. Active time 605 can be defined as follows.
  • drx-onDurationTimer drx-InactivityTimer
  • drx-onDurationTimer (615) is a parameter for setting the minimum time the UE is awake in the DRX cycle.
  • the drx-InactivityTimer 620 is a parameter for setting an additional awake time when a PDCCH indicating a new uplink transmission or downlink transmission is received (630).
  • drx-RetransmissionTimerDL is a parameter for setting the maximum awake time of a UE to receive a downlink retransmission in a downlink HARQ procedure.
  • drx-RetransmissionTimerUL is a parameter for setting the maximum time during which the UE is awake to receive an uplink retransmission grant in an uplink HARQ procedure.
  • drx-onDurationTimer may be set to, for example, time, the number of subframes, and the number of slots.
  • ra-ContentionResolutionTimer is a parameter for monitoring PDCCH in a random access procedure.
  • InActive time 610 is a time set not to monitor PDCCH or/or not to receive PDCCH during DRX operation. (610) can be. If the terminal does not monitor the PDCCH during the active time 605, it can reduce power consumption by entering a sleep or inactive state.
  • the DRX cycle means a period in which the UE wakes up and monitors the PDCCH. That is, it means a time interval or an on-duration occurrence period until the UE monitors the next PDCCH after monitoring the PDCCH.
  • DRX cycle There are two types of DRX cycle: short DRX cycle and long DRX cycle. Short DRX cycle can be applied as an option.
  • Long DRX cycle 625 is a long cycle among two DRX cycles set in the terminal. While operating in Long DRX, the terminal starts drx-onDurationTimer (615) again at the time when as much as Long DRX cycle (625) has elapsed from the start point (eg, start symbol) of drx-onDurationTimer (615). When operating with a Long DRX cycle (625), the terminal may start drx-onDurationTimer (615) in a slot after drx-SlotOffset in a subframe that satisfies the following [Equation 2].
  • drx-SlotOffset means a delay before starting drx-onDurationTimer 615.
  • drx-SlotOffset may be set to, for example, time, number of slots, and the like.
  • drx-LongCycleStartOffset may be used to define a Long DRX cycle (625) and drx-StartOffset to define a subframe from which the Long DRX cycle (625) starts.
  • drx-LongCycleStartOffset may be set to, for example, time, number of subframes, number of slots, and the like.
  • DCI downlink control information
  • Scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) in a 5G system is provided through DCI It is transmitted from the base station to the terminal.
  • the UE may monitor the DCI format for fallback and the DCI format for non-fallback with respect to PUSCH or PDSCH.
  • the contingency DCI format may be composed of a fixed field predefined between the base station and the terminal, and the non-preparation DCI format may include a configurable field.
  • DCI may be transmitted through a physical downlink control channel (PDCCH) through channel coding and modulation processes.
  • a Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC may be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the terminal.
  • RNTI Radio Network Temporary Identifier
  • Different RNTIs may be used according to the purpose of the DCI message, eg, UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly but is included in the CRC calculation process and transmitted.
  • the UE Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the allocated RNTI, and if the CRC check result is correct, the UE can know that the corresponding message has been transmitted to the UE.
  • DCI scheduling a PDSCH for system information may be scrambled with SI-RNTI.
  • SI system information
  • a DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI.
  • RAR Random Access Response
  • a DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI.
  • DCI notifying SFI Slot Format Indicator
  • DCI notifying TPC Transmit Power Control
  • DCI scheduling 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 in this case, CRC can be scrambled with C-RNTI.
  • DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • DCI format 0_1 can be used as a non-backup DCI for scheduling PUSCH, and in this case, CRC can be scrambled with C-RNTI.
  • DCI format 0_1 in which 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 in this case, CRC can be scrambled with C-RNTI.
  • DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • DCI format 1_1 can be used as a non-backup DCI for scheduling PDSCH, and in this case, CRC can be scrambled with C-RNTI.
  • DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • FIG. 7 illustrates an example of base station beam allocation according to TCI state setting in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 7 is a diagram illustrating an example of base station beam allocation according to TCI state setting.
  • the base station may transmit information on different N beams to the terminal through different N TCI states. For example, as shown in FIG.
  • the base station has qcl-Type2 parameters included in three TCI states (700, 705, and 710) associated with CSI-RS or SSB corresponding to different beams, and QCL type D By setting to , it can be notified that the antenna ports referring to the different TCI states 700, 705, or 710 are associated with different spatial Rx parameters, that is, different beams.
  • [Table 15-1] shows valid TCI state settings when the target antenna port is CSI-RS for tracking (TRS).
  • TRS means an NZP CSI-RS in which a repetition parameter is not set and trs-Info is set to true among CSI-RSs.
  • No. 3 in [Table 15-1] it can be used for aperiodic TRS.
  • the CSI-RS for CSI refers to an NZP CSI-RS in which a parameter indicating repetition (eg, a repetition parameter) is not set and trs-Info is not set to true among CSI-RSs.
  • [Table 15-3] indicates effective TCI state settings when the target antenna port is CSI-RS for beam management (BM, meaning the same as CSI-RS for L1 RSRP reporting).
  • the CSI-RS for BM means an NZP CSI-RS in which the repetition parameter is set among CSI-RSs and has a value of On or Off, and trs-Info is not set to true.
  • Table 15-4 shows effective TCI state settings when the target antenna port is PDCCH DMRS.
  • Table 15-5 shows effective TCI state settings when the target antenna port is PDSCH DMRS.
  • the target antenna port and reference antenna port for each step are set to "SSB” -> "TRS” -> "CSI-RS for CSI, or It is configured and operated like "CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS".
  • TCI state combinations applicable to PDCCH DMRS antenna ports are shown in [Table 16] below.
  • the 4th row is a combination assumed by the UE before RRC configuration, and configuration after RRC is not possible.
  • NR supports a hierarchical signaling method as shown in FIG. 8 for dynamic allocation of PDCCH beams.
  • the base station can set N TCI states (805, 810, ..., 820) to the terminal through RRC signaling 800, and some of them can be set as TCI states for CORESET. (825). Thereafter, the base station may instruct the terminal one of TCI states (830, 835, 840) for CORESET through MAC CE signaling (845). Thereafter, the UE receives the PDCCH based on beam information included in the TCI state indicated by the MAC CE signaling.
  • FIG. 9 illustrates an example of a TCI indicating MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 9 is a diagram illustrating a TCI indication MAC CE signaling structure for the PDCCH DMRS.
  • the TCI indication MAC CE signaling for the PDCCH DMRS consists of 2 bytes (16 bits), 5-bit serving cell ID 915, 4-bit CORESET ID 920, and 7-bit TCI state ID 925.
  • FIG. 10 illustrates an example of beam configuration of a control resource set and a search space in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 10 is a diagram illustrating an example of beam configuration of a control resource set (CORESET) and a search space according to the above description.
  • the base station may indicate one of the TCI state lists included in the CORESET 1000 configuration through MAC CE signaling (1005). After that, until another TCI state is indicated to the corresponding CORESET through another MAC CE signaling, the UE uses 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 makes it difficult to indicate a beam change faster than the MAC CE signaling delay, and also has the disadvantage of collectively applying the same beam for each CORESET regardless of search space characteristics, which makes flexible PDCCH beam operation difficult.
  • more flexible PDCCH beam configuration and operation methods are provided.
  • several distinct examples are provided for convenience of explanation, but they are not mutually exclusive and can be applied by appropriately combining with each other depending on the situation.
  • the base station may set one or a plurality of TCI states for a specific control region to the terminal, and may activate one of the set TCI states through a MAC CE activation command. For example, ⁇ TCI state#0, TCI state#1, TCI state#2 ⁇ are set as TCI states in control region #1, and the base station sets the TCI state for control region #1 through MAC CE. A command enabling to assume #0 may be transmitted to the terminal. The terminal can correctly receive the DMRS of the corresponding control region based on the QCL information in the activated TCI state based on the activation command for the TCI state received through the MAC CE.
  • control area #0 control area #0
  • the terminal responds to the DMRS transmitted from the control area #0
  • the SS/PBCH block identified in the initial access process or in the non-contention based random access process not triggered by the PDCCH command is QCL.
  • control area #X where the index is set to a value other than 0, if the terminal does not set the TCI state for the control area #X or activates one of them even though one or more TCI states are set If the MAC CE activation command is not received, the terminal may assume that the SS/PBCH block identified in the initial access process is QCL with respect to the DMRS transmitted in the control region #X.
  • the UE operates with carrier aggregation within a single cell or band, and a plurality of control resource sets existing within an activated bandwidth portion within a single or multiple cells have the same or different QCL-TypeD characteristics in a specific PDCCH monitoring interval and In case of overlapping, the terminal may select a specific control resource set according to the QCL priority determination operation and monitor control resource sets having the same QCL-TypeD characteristics as the corresponding control resource set. That is, when a plurality of control resource sets overlap in time, only one QCL-TypeD characteristic can be received.
  • the criteria for determining the QCL priority may be as follows.
  • a control resource set connected to a UE-specific search interval of the lowest index within a cell corresponding to the lowest index among cells including a UE-specific search interval.
  • each of the above criteria applies the next criterion when the criterion is not satisfied. For example, when control resource sets overlap in time in a specific PDCCH monitoring period, if all control resource sets are not connected to a common search period but connected to a terminal-specific search period, that is, if criterion 1 is not satisfied, the terminal may omit the application of criterion 1 and apply criterion 2.
  • the terminal may additionally consider the following two items for QCL information set in the control resource set. First, if control resource set 1 has CSI-RS 1 as a reference signal having a QCL-TypeD relationship, and this CSI-RS 1 has SSB 1 as a reference signal having a QCL-TypeD relationship, another If the reference signal with which control resource set 2 has a QCL-TypeD relationship is SSB 1, the UE may consider these two control resource sets 1 and 2 to have different QCL-TypeD characteristics.
  • control resource set 1 has CSI-RS 1 set in cell 1 as a reference signal having a QCL-TypeD relationship, and this CSI-RS 1 has a QCL-TypeD relationship
  • the reference signal is SSB 1
  • control resource set 2 has CSI-RS 2 configured in cell 2 as a reference signal having a QCL-TypeD relationship, and this CSI-RS 2 has the same reference signal having a QCL-TypeD relationship.
  • the UE may consider the two control resource sets to have the same QCL-TypeD characteristics.
  • FIG. 11 illustrates an example of a method in which a base station and a terminal transmit and receive data in consideration of a downlink data channel and a rate matching resource in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 11 is a diagram for explaining a method for transmitting and receiving data by a base station and a terminal in consideration of a downlink data channel and a rate matching resource.
  • the base station may configure one or multiple rate matching resources 1102 to the terminal through higher layer signaling (eg, RRC signaling).
  • the rate matching resource 1102 setting information may include time axis resource allocation information 1103 , frequency axis resource allocation information 1104 , and period information 1105 .
  • the bitmap corresponding to the frequency-axis resource allocation information 1104 corresponds to the "first bitmap”
  • the bitmap corresponding to the time-axis resource allocation information 1103 corresponds to the "second bitmap”
  • the period information 1105 The bitmap to be called is named "third bitmap".
  • the terminal may perform reception and decoding after assuming that the data channel 1101 is rate-matched in the rate matching resource 1102 portion.
  • the base station may dynamically notify the terminal through DCI whether to rate match the data channel in the set rate matching resource part through additional configuration (corresponding to the "rate matching indicator" in the aforementioned DCI format) .
  • the base station may select some of the configured rate matching resources and group them into rate matching resource groups, and informs the terminal of whether rate matching of the data channel for each rate matching resource group is performed using a DCI using a bitmap method.
  • granularity of "RB symbol level” and "RE level” is supported as a method of configuring the above-described rate matching resources in the UE. More specifically, the following setting method may be followed.
  • the terminal may receive up to four RateMatchPatterns set for each bandwidth part by higher layer signaling, and one RateMatchPattern may include the following contents.
  • a reserved resource in the bandwidth part a resource in which the time and frequency resource domains of the corresponding reserved resource are set in a combination of an RB level bitmap and a symbol level bitmap on the frequency axis may be included.
  • the reserve resource may span one or two slots.
  • a time domain pattern (periodicityAndPattern) in which time and frequency domains composed of each RB level and symbol level bitmap pair are repeated may be additionally set.
  • a time and frequency domain resource area set as a control resource set within the bandwidth part and a resource area corresponding to a time domain pattern set as a search space setting in which the corresponding resource area is repeated may be included.
  • the terminal may receive the following contents through higher layer signaling.
  • LTE CRS Cell-specific Reference Signal or Common Reference Signal
  • configuration information for the RE corresponding to the pattern, the number of ports of LTE CRS (nrofCRS-Ports) and LTE-CRS-vshift (s ) value (v-shift), LTE carrier center subcarrier location information (carrierFreqDL) from the reference frequency point (for example, reference point A), LTE carrier bandwidth size (carrierBandwidthDL) information, MBSFN (Multicast- broadcast single-frequency network) and the like corresponding to subframe configuration information (mbsfn-SubframeConfigList).
  • the terminal may determine the position of the CRS in the NR slot corresponding to the LTE subframe based on the above information.
  • It may include configuration information about a resource set corresponding to one or a plurality of ZP (Zero Power) CSI-RS in the bandwidth part.
  • ZP Zero Power
  • NR provides a function for setting a cell specific reference signal (CRS) pattern of LTE to the NR terminal. More specifically, the CRS pattern may be provided by RRC signaling including at least one parameter in a ServingCellConfig Information Element (IE) or a ServingCellConfigCommon IE.
  • IE ServingCellConfig Information Element
  • IE ServingCellConfigCommon IE
  • Examples of the parameters may include lte-CRS-ToMatchAround, lte-CRS-PatternList1-r16, lte-CRS-PatternList2-r16, crs-RateMatch-PerCORESETPoolIndex-r16, and the like.
  • the Rel-15 NR provides a function of setting one CRS pattern per serving cell through the lte-CRS-ToMatchAround parameter.
  • the above function has been extended to enable setting of a plurality of CRS patterns per serving cell. More specifically, one CRS pattern can be set per one LTE carrier in a Single-transmission and reception point (TRP) setting terminal, and two CRS patterns per one LTE carrier in a Multi-TRP setting terminal could be set.
  • TRP Single-transmission and reception point
  • two CRS patterns per one LTE carrier in a Multi-TRP setting terminal could be set.
  • up to three CRS patterns per serving cell can be set in a single-TRP configuration terminal through the lte-CRS-PatternList1-r16 parameter.
  • a CRS may be configured for each TRP in a multi-TRP configuration terminal.
  • the CRS pattern for TRP1 may be set through the lte-CRS-PatternList1-r16 parameter
  • the CRS pattern for TRP2 may be set through the lte-CRS-PatternList2-r16 parameter.
  • crs-RateMatch-PerCORESETPoolIndex determines whether both the CRS patterns of TRP1 and TRP2 are applied to a specific PDSCH (Physical Downlink Shared Channel) or whether only the CRS pattern for one TRP is applied. It is determined through the -r16 parameter. If the crs-RateMatch-PerCORESETPoolIndex-r16 parameter is set to enabled, only the CRS pattern of one TRP is applied, and in other cases, both CRS patterns of the two TRPs are applied.
  • PDSCH Physical Downlink Shared Channel
  • [Table 17] shows the ServingCellConfig IE including the CRS pattern
  • [Table 18] shows the RateMatchPatternLTE-CRS IE including at least one parameter for the CRS pattern.
  • FIG. 12 illustrates an example of a method for selecting a receivable control resource set in consideration of priority when a terminal receives a downlink control channel in a wireless communication system according to various embodiments of the present disclosure.
  • a UE may be configured to receive a plurality of control resource sets overlapping in time in a specific PDCCH monitoring period 1210, and these plurality of control resource sets are a common search space or a UE-specific search space for a plurality of cells.
  • the first control resource set 1215 connected to the first common discovery period may exist, and the first bandwidth portion of the second cell (1205 ), the first control resource set 1220 connected to the first common search period and the second control resource set 1225 connected to the second terminal-specific search period may exist.
  • the control resource sets 1215 and 1220 have a relationship of CSI-RS resource #1 and QCL-TypeD set within the bandwidth part #1 of cell #1, and the control resource set 1225 is the bandwidth #1 of cell #2. It may have a relationship between CSI-RS resource No. 1 set in the part and QCL-TypeD.
  • a UE may be configured to receive a plurality of control resource sets overlapping in time in a specific PDCCH monitoring period 1240, and the plurality of control resource sets may be configured to receive a common search space or a UE-specific search space for a plurality of cells. It may be related to the search space.
  • the first control resource set 1245 connected to the UE 1 specific search interval and the second control resource set connected to the UE 2 specific search interval 1250 may exist, and within the first bandwidth part 1235 of the second cell, the first control resource set 1255 connected to the first terminal-specific search period and the second control resource connected to the third terminal-specific search period A set 1260 may exist.
  • Control resource sets 1245 and 1250 have a relationship of CSI-RS resource #1 and QCL-TypeD set within bandwidth #1 of cell #1, and control resource set 1255 is bandwidth #1 of cell #2 It has a QCL-TypeD relationship with the first CSI-RS resource set in the second cell, and the control resource set 1260 may have a QCL-TypeD relationship with the second CSI-RS resource set in the first bandwidth portion of the second cell. have.
  • criterion 1 is applied to the corresponding PDCCH monitoring period 1240, since there is no common search period, criterion 2, which is the next criterion, can be applied.
  • the terminal can receive control resource sets 1245 and 1250 in the corresponding PDCCH monitoring period 1240.
  • rate matching or puncturing is performed by transmission/reception of channel A considering resource C in the area where resource A and resource B overlap motion can be considered.
  • a specific operation may follow the following.
  • the base station may map and transmit channel A only for the remaining resource regions excluding resource C corresponding to an overlapping region with resource B among all resources A to transmit symbol sequence A to the terminal.
  • symbol sequence A is composed of ⁇ symbol #1, symbol #2, symbol #3, symbol 4 ⁇
  • resource A is ⁇ resource #1, resource #2, resource #3, resource #4 ⁇
  • the base station excluding ⁇ resource #3 ⁇ corresponding to resource C among resource A is a symbol sequence for the remaining resources ⁇ resource #1, resource #2, resource #4 ⁇ A can be sequentially mapped and sent.
  • the base station may map symbol sequences ⁇ symbol #1, symbol #2, and symbol #3 ⁇ to ⁇ resource #1, resource #2, and resource #4 ⁇ and transmit them.
  • the terminal can determine resource A and resource B from scheduling information on symbol sequence A from the base station, and through this, it can determine resource C, which is an area where resource A and resource B overlap.
  • the UE may receive the symbol sequence A assuming that the symbol sequence A is mapped and transmitted in the remaining regions excluding resource C from among all resources A.
  • symbol sequence A is composed of ⁇ symbol #1, symbol #2, symbol #3, symbol 4 ⁇
  • resource A is ⁇ resource #1, resource #2, resource #3, resource #4 ⁇
  • the terminal excluding ⁇ resource #3 ⁇ corresponding to resource C among resource A is a symbol sequence for the remaining resources ⁇ resource #1, resource #2, resource #4 ⁇ It can be received assuming that A is sequentially mapped.
  • the terminal assumes that the symbol sequences ⁇ symbol #1, symbol #2, and symbol #3 ⁇ are mapped to ⁇ resource #1, resource #2, and resource #4 ⁇ , respectively, and performs a series of reception operations thereafter.
  • the base station maps the symbol sequence A to the entire resource A when there is a resource C corresponding to a region overlapping with the resource B among all resources A to transmit the symbol sequence A to the terminal, but transmits in the resource region corresponding to the resource C Transmission may be performed only for the remaining resource regions excluding resource C from among resource A without performing the transmission.
  • symbol sequence A is composed of ⁇ symbol #1, symbol #2, symbol #3, symbol 4 ⁇
  • resource A is ⁇ resource #1, resource #2, resource #3, resource #4 ⁇
  • resource #5 ⁇ the base station converts the symbol sequence A ⁇ symbol #1, symbol #2, symbol #3, symbol #4 ⁇ to resource A ⁇ resource #1, resource #2, resource # 3, resource #4 ⁇ , and symbol sequences corresponding to ⁇ resource #1, resource #2, resource #4 ⁇ , which are the remaining resources excluding ⁇ resource #3 ⁇ corresponding to resource C among resource A ⁇ Only symbol #1, symbol #2, and symbol #4 ⁇ may be transmitted, and ⁇ symbol #3 ⁇ mapped to ⁇ resource #3 ⁇ corresponding to resource C may not be transmitted.
  • the base station may map symbol sequences ⁇ symbol #1, symbol #2, and symbol #4 ⁇ to ⁇ resource #1, resource #2, and resource #4 ⁇ and transmit them.
  • the terminal can determine resource A and resource B from scheduling information on symbol sequence A from the base station, and through this, it can determine resource C, which is an area where resource A and resource B overlap.
  • the terminal may receive the symbol sequence A assuming that the symbol sequence A is mapped to the entire resource A and transmitted only in the remaining regions excluding resource C among the resource regions A.
  • symbol sequence A is composed of ⁇ symbol #1, symbol #2, symbol #3, symbol 4 ⁇
  • resource A is ⁇ resource #1, resource #2, resource #3, resource #4 ⁇
  • resource #5 ⁇ the terminal determines that the symbol sequence A ⁇ symbol #1, symbol #2, symbol #3, symbol #4 ⁇ is resource A ⁇ resource #1, resource #2, resource # 3 and resource #4 ⁇ , but it can be assumed that ⁇ symbol #3 ⁇ mapped to ⁇ resource #3 ⁇ corresponding to resource C is not transmitted, and ⁇ resource #3 corresponding to resource C among resource A ⁇ , it can be received assuming that the symbol sequence ⁇ symbol #1, symbol #2, symbol #4 ⁇ corresponding to the remaining resources ⁇ resource #1, resource #2, resource #4 ⁇ is mapped and transmitted.
  • the terminal assumes that the symbol sequence ⁇ symbol #1, symbol #2, symbol #4 ⁇ is mapped to ⁇ resource #1, resource #2, resource #4 ⁇ and transmitted, and performs a
  • Rate matching means that the size of the signal is adjusted in consideration of the amount of resources capable of transmitting the signal.
  • rate matching of a data channel may mean that the size of data is adjusted accordingly without mapping and transmitting the data channel for a specific time and frequency resource domain.
  • FIG. 13 illustrates an example of frequency axis resource allocation of a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 13 is a diagram illustrating an example of frequency axis resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure.
  • PDSCH physical downlink shared channel
  • FIG. 13 is a diagram illustrating three frequency axis resource allocation methods of type 0 (1300), type 1 (1305), and dynamic switch (1310) that can be set through an upper layer in an NR wireless communication system.
  • NRBG means the number of RBGs (resource block groups) determined as shown in [Table 19] below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size. Data is transmitted to the RBG indicated by 1.
  • the terminal is configured to use only resource type 1 through higher layer signaling (1305), some DCIs allocating the PDSCH to the terminal and frequency-axis resource allocation information consisting of N bits. Conditions for this will be described later.
  • the base station can set the starting VRB 1320 and the length 1325 of frequency axis resources continuously allocated therefrom.
  • some DCIs allocating a PDSCH to the terminal include payload 1315 and resource type 1 for setting resource type 0 Includes frequency axis resource allocation information consisting of bits of a large value (1335) among payloads (1320, 1325) for setting . Conditions for this will be described later. At this time, one bit may be added to the first part (MSB) of the frequency axis resource allocation information in the DCI, and if the corresponding bit has a value of '0', it is indicated that resource type 0 is used, and if the value is '1', resource It may be indicated that type 1 is used.
  • MSB first part
  • the base station provides a table for time domain resource allocation information for a downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) to the terminal, and higher layer signaling (eg, For example, RRC signaling).
  • PDSCH downlink shared channel
  • PUSCH physical uplink shared channel
  • higher layer signaling eg, For example, RRC signaling
  • the time domain resource allocation information includes PDCCH-to-PDSCH slot timing (corresponding to a time interval in units of slots between a time when a PDCCH is received and a time when a PDSCH scheduled by the received PDCCH is transmitted, denoted as K0).
  • PDCCH-to-PUSCH slot timing (corresponding to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2)
  • K2 PDCCH-to-PUSCH slot timing
  • Information about the position and length of the scheduled start symbol, mapping type of PDSCH or PUSCH, etc. may be included. For example, information such as [Table 20] or [Table 21] below may be transmitted from the base station to the terminal.
  • the base station may notify the terminal of one of the above-described table entries for time domain resource allocation information through L1 signaling (eg, DCI) (eg, to be indicated by the 'time domain resource allocation' field in DCI). can).
  • the terminal may obtain time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.
  • FIG. 14 illustrates an example of time axis resource allocation in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 14 is a diagram illustrating an example of time axis resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure.
  • a base station uses subcarrier spacing (SCS) ( ⁇ PDSCH, ⁇ PDCCH), scheduling offset of a data channel and a control channel configured using an upper layer.
  • SCS subcarrier spacing
  • the time axis position of the PDSCH resource may be indicated according to the (K0) value and the OFDM symbol start position 1400 and length 1405 within one slot dynamically indicated through DCI.
  • FIG. 15 illustrates an example of time axis resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 15 is a diagram illustrating an example of time domain resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.
  • a scheduling offset may be generated.
  • the subcarrier intervals of the data channel and the control channel are different (1505, ⁇ PDSCH ⁇ ⁇ PDCCH)
  • the base station and the terminal are based on the subcarrier interval of the PDCCH , a scheduling offset may be generated according to a predetermined slot offset K0.
  • the terminal uses the DCI-instructed transmission method (modulation and coding instruction index (MCS), demodulation reference signal related information, time and PDSCH processing time for receiving PDSCH by applying frequency resource allocation information, etc.) may be required.
  • MCS modulation and coding instruction index
  • the PDSCH processing time was defined in consideration of this.
  • the PDSCH processing time of the UE may follow [Equation 3] below.
  • each variable may have the following meaning.
  • the numerology ⁇ may correspond to the minimum value among ⁇ PDCCH , ⁇ PDSCH , and ⁇ UL to maximize the T proc,1
  • ⁇ PDCCH , ⁇ PDSCH , and ⁇ UL are the numerology and schedule of the PDCCH for which the PDSCH is scheduled, respectively. It may mean the numerology of the received PDSCH and the numerology of the uplink channel through which the HARQ-ACK will be transmitted.
  • [Table 22] relates to PDSCH processing time in case of PDSCH processing capability 1.
  • [Table 23] relates to PDSCH processing time in case of PDSCH processing capability 2.
  • T ext When the UE uses the shared spectrum channel access method, the UE may calculate T ext and apply it to the PDSCH processing time. Otherwise, T ext is assumed to be zero.
  • the last symbol of the PDSCH is the ith symbol in the slot in which the PDSCH is transmitted, and if i ⁇ 7, d 1,1 is 7-i, otherwise d 1,1 is 0.
  • d 2 of the PUCCH with a high priority index may be set to a value reported from the UE. Otherwise, d 2 is 0.
  • the value of d1,1 is determined according to the number of symbols L, which is the number of symbols of the scheduled PDSCH, and the number of symbols d overlapped between the PDCCH scheduling the PDSCH and the scheduled PDSCH as follows can
  • the value of d 1,1 is the number of symbols L of the scheduled PDSCH and the number of overlapping symbols between the PDCCH scheduling the PDSCH and the scheduled PDSCH as follows. Depending on d can be determined
  • PDSCH processing time according to UE processing capability 2 can be applied when the UE sets processingType2Enabled, which is higher layer signaling, to enable for the corresponding cell.
  • the UE If the position of the first uplink transmission symbol of the PUCCH including the HARQ-ACK information (K 1 defined as the transmission time of the HARQ-ACK, the PUCCH resource used for HARQ-ACK transmission, and the timing advance effect may be considered) If it does not start earlier than the first uplink transmission symbol that appears after a time of T proc,1 from the last symbol of the PDSCH, the UE must transmit a valid HARQ-ACK message. That is, the UE must transmit the PUCCH including the HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the terminal cannot provide valid HARQ-ACK information corresponding to the scheduled PDSCH to the base station.
  • T proc,1 can be used for both general and extended CP cases. In the case of a PDSCH composed of two PDSCH transmission positions within one slot, d 1,1 is calculated based on the first PDSCH transmission position within the corresponding slot.
  • ⁇ PDCCH which is the numerology through which PDCCH to be scheduled next
  • ⁇ PDSCH which is the numerology through which PDSCH scheduled through the corresponding PDCCH is transmitted
  • a transmission symbol of the corresponding PDSCH may include a DM-RS.
  • the scheduled PDSCH may be transmitted from N pdsch symbols after the last symbol of the PDCCH that scheduled the corresponding PDSCH.
  • a transmission symbol of the corresponding PDSCH may include a DM-RS.
  • [Table 24] relates to N pdsch according to the scheduled PDCCH subcarrier interval.
  • FIG. 16 illustrates an example of beam configuration and activation of a PDSCH in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 16 illustrates a process for setting and activating a PDSCH beam.
  • a list of TCI states for the PDSCH may be indicated through an upper layer list such as RRC (1600). The list of the TCI states may be indicated, for example, by 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 (1620). The maximum number of activated TCI states may be determined according to capabilities reported by the UE.
  • 1650 shows an example of a MAC-CE structure for PDSCH TCI state activation/deactivation.
  • the base station may set at least one SRS configuration for each uplink BWP to deliver configuration information for SRS transmission to the terminal, and may also set at least one SRS resource set for each SRS configuration.
  • the base station and the terminal may send and receive higher signaling information as follows to deliver information about the SRS resource set.
  • - resourceType Time axis transmission setting of the SRS resource referenced by the SRS resource set, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information may be provided according to the usage of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information may be provided, and associated CSI-RS information may be provided according to the usage of the SRS resource set.
  • the UE can understand that the SRS resource included in the set of SRS resource indexes referenced by the SRS resource set follows the information set in the SRS resource set.
  • the base station and the terminal may transmit and receive higher layer signaling information to deliver individual configuration information for the SRS resource.
  • the individual configuration information for the SRS resource may include time-frequency axis mapping information within a slot of the SRS resource, which may include information on frequency hopping within a slot or between slots of the SRS resource.
  • the individual configuration information for the SRS resource may include time axis transmission configuration of the SRS resource, and may be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This may be limited to having a time axis transmission setting such as an SRS resource set including an SRS resource.
  • an additional SRS resource transmission period and slot offset (eg, periodicityAndOffset) may be included in the time axis transmission setting.
  • the base station may activate, deactivate, or trigger SRS transmission to the terminal through higher layer signaling including RRC signaling or MAC CE signaling, or L1 signaling (eg, DCI). For example, the base station may activate or deactivate periodic SRS transmission through higher layer signaling to the terminal.
  • the base station may instruct to activate an SRS resource set in which resourceType is set to periodic through higher layer signaling, and the terminal may transmit an SRS resource referred to in the activated SRS resource set.
  • Time-frequency axis resource mapping within the slot of the transmitted SRS resource follows resource mapping information set in the SRS resource, and slot mapping including transmission period and slot offset follows periodicityAndOffset set in the SRS resource.
  • the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation info set in the SRS resource or associated CSI-RS information set in the SRS resource set including the SRS resource.
  • the UE may transmit the SRS resource within the uplink BWP activated for the periodic SRS resource activated through higher layer signaling.
  • the base station may activate or deactivate semi-persistent SRS transmission through higher layer signaling to the terminal.
  • the base station may instruct to activate the SRS resource set through MAC CE signaling, and the terminal may transmit the SRS resource referred to in the activated SRS resource set.
  • An SRS resource set activated through MAC CE signaling may be limited to an SRS resource set whose resourceType is set to semi-persistent.
  • Time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and slot mapping including transmission period and slot offset follows periodicityAndOffset set in the SRS resource.
  • the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation info set in the SRS resource or associated CSI-RS information set in the SRS resource set including the SRS resource. If spatial relation info is set in the SRS resource, instead of following it, a spatial domain transmission filter may be determined by referring to configuration information on spatial relation info transmitted through MAC CE signaling for activating semi-persistent SRS transmission.
  • the UE may transmit the SRS resource within the uplink BWP activated for the semi-persistent SRS resource activated through higher layer signaling.
  • the base station may trigger aperiodic SRS transmission to the terminal through DCI.
  • the base station may indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) through the SRS request field of the DCI.
  • the UE can understand that the SRS resource set including the aperiodic SRS resource trigger indicated through the DCI in the aperiodic SRS resource trigger list among the configuration information of the SRS resource set has been triggered.
  • the UE may transmit the SRS resource referred to in the triggered SRS resource set. Time-frequency axis resource mapping within a slot of a transmitted SRS resource follows resource mapping information set in the SRS resource.
  • slot mapping of the transmitted SRS resource may be determined through a slot offset between the PDCCH including DCI and the SRS resource, which may refer to value (s) included in a slot offset set set in the SRS resource set.
  • the slot offset between the PDCCH including the DCI and the SRS resource may apply a value indicated by the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set set in the SRS resource set.
  • the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation info set in the SRS resource or associated CSI-RS information set in the SRS resource set including the SRS resource.
  • the UE may transmit an SRS resource within an activated uplink BWP for an aperiodic SRS resource triggered through DCI.
  • the minimum A time interval of (minimum time interval) may be required.
  • the time interval for SRS transmission of the UE is defined as the number of symbols between the last symbol of the PDCCH including the DCI triggering aperiodic SRS transmission and the first symbol to which the first transmitted SRS resource among transmitted SRS resource(s) is mapped.
  • the minimum time interval may be determined by referring to the PUSCH preparation procedure time required for the UE to prepare for PUSCH transmission.
  • the minimum time interval may have a different value depending on where an SRS resource set including a transmitted SRS resource is used.
  • the minimum time interval may be defined as an N2 symbol defined by referring to the PUSCH preparation procedure time of the UE and considering UE processing capability according to the capability of the UE.
  • the minimum time interval is set as N2 symbol, and the usage of the SRS resource set is 'nonCodebook'
  • the minimum time interval can be set to N2+14 symbols.
  • the UE transmits the aperiodic SRS when the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and ignores the DCI triggering the aperiodic SRS when the time interval for aperiodic SRS transmission is less than the minimum time interval.
  • the spatialRelationInfo setting information in [Table 25] refers to one reference signal and applies the beam information of the reference signal to the beam used for the corresponding SRS transmission.
  • the setting of spatialRelationInfo may include information such as the following [Table 26].
  • an SS/PBCH block index, CSI-RS index, or SRS index may be set as an index of a reference signal to be referred to in order to use beam information of a specific reference signal.
  • Higher signaling referenceSignal is setting information indicating which beam information of a reference signal is referred to for transmission of the corresponding SRS
  • ssb-Index is the index of the SS/PBCH block
  • csi-RS-Index is the index of the CSI-RS
  • srs is the index of the SRS. each index.
  • the terminal can apply the RX beam used when receiving the SS/PBCH block corresponding to the ssb-Index as the transmit beam of the corresponding SRS transmission. If the value of higher signaling referenceSignal is set to 'csi-RS-Index', the UE can apply the Rx beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the Tx beam of the corresponding SRS transmission. . If the value of higher signaling referenceSignal is set to 'srs', the terminal can apply the transmission beam used when transmitting the SRS corresponding to srs as the transmission beam of the corresponding SRS transmission.
  • PUSCH transmission can be dynamically scheduled by a UL grant in DCI or operated by configured grant Type 1 or Type 2.
  • Dynamic scheduling indication for PUSCH transmission is available in DCI format 0_0 or 0_1.
  • Configured grant Type 1 PUSCH transmission can be semi-statically set through reception of configuredGrantConfig including rrc-ConfiguredUplinkGrant in [Table 27] through higher signaling without reception of UL grant in DCI.
  • Configured grant Type 2 PUSCH transmission can be scheduled semi-persistently by UL grant in DCI after receiving configuredGrantConfig not including rrc-ConfiguredUplinkGrant in [Table 27] through higher signaling.
  • parameters applied to PUSCH transmission are [Except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, scaling of UCI-OnPUSCH provided by push-Config of [Table 28], which is an upper signaling.
  • configuredGrantConfig which is the upper signaling of Table 27. If the terminal is provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 27], the terminal applies tp-pi2BPSK in push-Config of [Table 28] to PUSCH transmission operated by the configured grant.
  • PUSCH transmission can follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in push-Config of [Table 28], which is an upper signaling, is 'codebook' or 'nonCodebook'.
  • PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be semi-statically set by configured grant. If the UE is instructed to schedule PUSCH transmission through DCI format 0_0, the UE performs PUSCH transmission using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the uplink BWP activated in the serving cell. Beam configuration for transmission is performed, and at this time, PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission through DCI format 0_0 in a BWP in which PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE is not configured with txConfig in push-Config of [Table 28], the UE does not expect to be scheduled in DCI format 0_1.
  • Codebook-based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can operate quasi-statically by configured grant. If the codebook-based PUSCH is dynamically scheduled by DCI format 0_1 or quasi-statically configured by configured grant, the UE uses the SRS Resource Indicator (SRI), Transmission Precoding Matrix Indicator (TPMI), and transmission rank (PUSCH transmission layer number), a precoder for PUSCH transmission is determined.
  • SRI SRS Resource Indicator
  • TPMI Transmission Precoding Matrix Indicator
  • PUSCH transmission layer number transmission rank
  • SRI may be given through a field SRS resource indicator in DCI or set through higher signaling, srs-ResourceIndicator.
  • the terminal receives at least one SRS resource, and can receive up to two SRS resources.
  • the SRS resource indicated by the corresponding SRI means an SRS resource corresponding to the SRI among SRS resources transmitted prior to the PDCCH including the corresponding SRI.
  • TPMI and transmission rank may be given through a field precoding information and number of layers in DCI or set through precodingAndNumberOfLayers, which is a higher level signaling. TPMI is used to indicate a precoder applied to PUSCH transmission.
  • TPMI is used to indicate a precoder to be applied in the configured one SRS resource. If the UE is configured with a plurality of SRS resources, TPMI is used to indicate a precoder to be applied in the SRS resource indicated through the SRI.
  • a precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the value of nrofSRS-Ports in SRS-Config, which is higher signaling.
  • the UE determines a codebook subset based on TPMI and codebookSubset in push-Config, which is higher signaling.
  • CodebookSubset in push-Config, which is higher signaling may be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the terminal to the base station.
  • the terminal does not expect the value of codebookSubset, which is higher signaling, to be set to 'fullyAndPartialAndNonCoherent'.
  • the terminal does not expect the value of codebookSubset, which is higher signaling, to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'.
  • the terminal can receive one SRS resource set in which the value of usage in the SRS-ResourceSet, which is higher signaling, is set to 'codebook', and one SRS resource in the corresponding SRS resource set can be indicated through SRI. If several SRS resources are set in an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the UE sets the same value for all SRS resources in the nrofSRS-Ports value in the upper signaling SRS-Resource. expect this to be set.
  • the terminal transmits one or more SRS resources included in the SRS resource set in which the value of usage is set to 'codebook' to the base station according to higher signaling, and the base station selects one of the SRS resources transmitted by the terminal to correspond to the SRS Instructs the UE to perform PUSCH transmission using the transmission beam information of the resource.
  • SRI is used as information for selecting an index of one SRS resource and is included in DCI.
  • the base station includes information indicating the TPMI and rank to be used by the terminal for PUSCH transmission in the DCI.
  • the UE performs PUSCH transmission by using the SRS resource indicated by the SRI and applying the rank indicated by the transmission beam of the corresponding SRS resource and the precoder indicated by the TPMI.
  • Non-codebook based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can operate quasi-statically by configured grant.
  • the terminal can receive non-codebook based PUSCH transmission scheduling through DCI format 0_1.
  • the terminal can receive one connected NZP CSI-RS resource (non-zero power CSI-RS).
  • the UE may calculate a precoder for SRS transmission through measurement of NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set and the first symbol of aperiodic SRS transmission in the UE is less than 42 symbols, the UE updates the information on the precoder for SRS transmission. don't expect to be
  • the connected NZP CSI-RS is indicated by SRS request, which is a field in DCI format 0_1 or 1_1.
  • SRS request which is a field in DCI format 0_1 or 1_1.
  • the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource
  • the connected NZP CSI-RS exists when the value of the field SRS request in DCI format 0_1 or 1_1 is not '00' will point to At this time, the corresponding DCI must not indicate cross carrier or cross BWP scheduling.
  • the corresponding NZP CSI-RS is located in the slot where the PDCCH including the SRS request field is transmitted. At this time, the TCI states set for the scheduled subcarriers are not set to QCL-TypeD.
  • the connected NZP CSI-RS may be indicated through associatedCSI-RS in the SRS-ResourceSet, which is higher signaling.
  • the UE does not expect spatialRelationInfo, which is higher signaling for SRS resource, and associatedCSI-RS in SRS-ResourceSet, which is higher signaling, to be set together.
  • the UE may determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station.
  • SRI may be indicated through a field SRS resource indicator in DCI or set through higher signaling, srs-ResourceIndicator. Similar to the above-described codebook-based PUSCH transmission, when a UE receives SRI through DCI, the SRS resource indicated by the SRI selects the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH including the SRI. it means.
  • the UE can use one or a plurality of SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. It is decided. At this time, SRS resources transmitted simultaneously by the UE occupy the same RB.
  • the UE configures one SRS port for each SRS resource. Only one SRS resource set in which the value of usage in the SRS-ResourceSet, which is an upper signaling, is set to 'nonCodebook' can be set, and up to four SRS resources for non-codebook based PUSCH transmission can be set.
  • the base station transmits one NZP-CSI-RS associated with the SRS resource set to the terminal, and the terminal transmits one or more SRS resources in the corresponding SRS resource set based on the measurement result when receiving the corresponding NZP-CSI-RS Calculate the precoder to use when transmitting.
  • the terminal applies the calculated precoder when transmitting one or more SRS resources in the SRS resource set with usage set to 'nonCodebook' to the base station, and the base station uses one or more of the one or more SRS resources received.
  • Select SRS resource indicates an index capable of expressing a combination of one or a plurality of SRS resources, and the SRI is included in DCI.
  • the number of SRS resources indicated by the SRI transmitted by the base station may be the number of transmission layers of the PUSCH, and the UE transmits the PUSCH by applying a precoder applied to transmission of the SRS resource to each layer.
  • the PUSCH preparation procedure time When the base station schedules the UE to transmit the PUSCH using DCI format 0_0, 0_1, or 0_2, the UE uses the DCI-instructed transmission method (transmission precoding method of SRS resource, number of transmission layers, spatial domain transmission filter)
  • a PUSCH preparation process time may be required to transmit the PUSCH by applying .
  • NR defined the PUSCH preparation process time considering this.
  • the PUSCH preparation process time of the UE may follow [Equation 4] below.
  • each variable may have the following meaning.
  • UE processing capability 1 The number of symbols determined according to UE processing capability 1 or 2 and numerology ⁇ according to the capabilities of the UE. If it is reported as UE processing capability 1 according to the UE's capability report, it has the value of [Table 29], and it is reported as UE processing capability 2 and it is set through higher layer signaling that UE processing capability 2 can be used [Table 30] can have a value of
  • ⁇ DL means downlink numerology through which PDCCH including DCI scheduling PUSCH is transmitted
  • ⁇ UL means uplink numerology through which PUSCH is transmitted.
  • d 2 When OFDM symbols of a PUCCH, a PUSCH with a high priority index, and a PUCCH with a low priority index overlap in time, the d 2 value of the PUSCH with a high priority index is used. Otherwise, d 2 is 0.
  • T ext If the UE uses the shared spectrum channel access method, the UE can calculate T ext and apply it to the PUSCH preparation process time. Otherwise, T ext is assumed to be zero.
  • T switch When an uplink switching interval is triggered, T switch is assumed to be the switching interval time. otherwise, it is assumed to be 0.
  • the base station and the terminal When the base station and the terminal consider the time axis resource mapping information of the PUSCH scheduled through the DCI and the effect of the uplink-downlink timing advance, from the last symbol of the PDCCH including the DCI scheduled the PUSCH to after T proc,2 If the first symbol of the PUSCH starts before the first uplink symbol that the CP starts, it is determined that the PUSCH preparation process time is not sufficient. If not, the base station and the terminal determine that the PUSCH preparation process time is sufficient. The UE may transmit the PUSCH only when the PUSCH preparation time is sufficient, and may ignore the DCI for scheduling the PUSCH when the PUSCH preparation time is not sufficient.
  • the 5G system supports two types, PUSCH repeated transmission type A and PUSCH repeated transmission type B, as repeated transmission methods of an uplink data channel.
  • the UE may be configured with either PUSCH repetitive transmission type A or B through higher layer signaling.
  • the symbol length of the uplink data channel and the position of the start symbol are determined by the time domain resource allocation method within one slot, and the base station determines the number of repeated transmissions through higher layer signaling (eg RRC signaling) or L1 signaling (For example, DCI) may notify the terminal.
  • higher layer signaling eg RRC signaling
  • L1 signaling For example, DCI
  • the terminal can repeatedly transmit an uplink data channel having the same start symbol as the length of the uplink data channel configured based on the number of repeated transmissions received from the base station in consecutive slots. At this time, when at least one symbol of a slot set by the base station to the terminal as downlink or a symbol of an uplink data channel configured by the terminal is set to downlink, the terminal skips transmission of the uplink data channel, but uplink The number of repeated transmissions of the data channel is counted.
  • the start symbol and length of the uplink data channel are determined by the time domain resource allocation method within one slot, and the base station sets the number of repetitions of repeated transmissions through upper signaling (eg, RRC signaling) or L1 signaling (eg, For example, the UE may be notified through DCI).
  • upper signaling eg, RRC signaling
  • L1 signaling eg, For example, the UE may be notified through DCI.
  • the nominal repetition of the uplink data channel is determined as follows based on the set start symbol and length of the uplink data channel.
  • the slot where the nth nominal repetition starts is and the symbol starting in that slot is given by mod(S+n*L, N symb slot ).
  • the slot where the nth nominal repetition ends is The symbol given by and ending in that slot is given by mod(S+(n+1)*L-1, N symb slot ).
  • n 0, ..., numberofrepetitions-1
  • S is the start symbol of the configured uplink data channel
  • L represents the symbol length of the configured uplink data channel.
  • K S represents a slot in which PUSCH transmission starts
  • N symb slot represents the number of symbols per slot.
  • the UE determines an invalid symbol for PUSCH repetitive transmission type B.
  • a symbol configured for downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated is determined as an invalid symbol for PUSCH repeated transmission type B.
  • invalid symbols can be set in higher-level parameters (e.g. InvalidSymbolPattern).
  • a higher layer parameter e.g. InvalidSymbolPattern
  • the period and pattern of the bitmap may be set through a higher layer parameter (for example, periodicityAndPattern).
  • a higher layer parameter eg InvalidSymbolPattern
  • the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1
  • the terminal applies the invalid symbol pattern
  • the parameter indicates 0, the terminal does not apply the invalid symbol pattern.
  • the upper layer parameter eg InvalidSymbolPattern
  • the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal applies the invalid symbol pattern.
  • the terminal may consider symbols other than the invalid symbol as valid symbols. If more than one valid symbol is included in each nominal repetition, the nominal repetition may include one or more actual repetitions.
  • each actual repetition includes a contiguous set of valid symbols that can be used for PUSCH repeated transmission type B in one slot.
  • FIG. 17 illustrates an example of a PUSCH repetitive transmission type in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 17 is a diagram illustrating an example of PUSCH repeated transmission type B in a wireless communication system according to an embodiment of the present disclosure.
  • the terminal may set the start symbol S of the uplink data channel to 0 and the length L of the uplink data channel to 14, and set the number of repeated transmissions to 16. In this case, nominal repetition is indicated in 16 consecutive slots (1701). After that, the terminal may determine a symbol set as a downlink symbol in each nominal repetition 1701 as an invalid symbol. In addition, the terminal determines symbols set to 1 in invalid symbol pattern 1702 as invalid symbols. In each nominal repetition, when valid symbols, not invalid symbols, consist of one or more consecutive symbols in one slot, they are set as actual repetitions and transmitted (1703).
  • NR Release 16 may define the following additional methods for UL grant-based PUSCH transmission and configured grant-based PUSCH transmission across slot boundaries.
  • Method 1 Through one UL grant, two or more repeated PUSCH transmissions are scheduled within one slot or across the boundary of consecutive slots. Also, for method 1, time domain resource allocation information in DCI indicates resources of the first repeated transmission. In addition, time domain resource information of the remaining repeated transmissions may be determined according to time domain resource information of the first repeated transmission and an uplink or downlink direction determined for each symbol of each slot. Each repeated transmission occupies consecutive symbols.
  • Method 2 Two or more repeated PUSCH transmissions are scheduled in consecutive slots through one UL grant. At this time, one transmission is designated for each slot, and different start points or repetition lengths may be different for each transmission. Also, in method 2, the time domain resource allocation information in the DCI indicates the start point and repetition length of all repeated transmissions. In addition, when repeated transmission is performed within a single slot through method 2, if there are several bundles of consecutive uplink symbols in the corresponding slot, each repeated transmission is performed for each bundle of uplink symbols. If a bundle of consecutive uplink symbols exists uniquely in the corresponding slot, one repetition of PUSCH transmission is performed according to the method of NR Release 15.
  • Method 3 Two or more repeated PUSCH transmissions are scheduled in consecutive slots through two or more UL grants. At this time, one transmission is designated for each slot, and the n-th UL grant can be received before the PUSCH transmission scheduled for the n-1-th UL grant ends.
  • Method 4 Through one UL grant or one configured grant, one or several PUSCH repeated transmissions within a single slot, or two or more PUSCH repeated transmissions across the boundary of consecutive slots Can be supported. have.
  • the number of repetitions indicated by the base station to the terminal is only a nominal value, and the number of repeated PUSCH transmissions actually performed by the terminal may be greater than the nominal number of repetitions.
  • Time domain resource allocation information within the DCI or within the configured grant means the resource of the first repeated transmission indicated by the base station.
  • Time domain resource information of the remaining repeated transmissions may be determined by referring to resource information of at least the first repeated transmission and uplink or downlink directions of symbols.
  • the repeated transmission may be divided into a plurality of repeated transmissions. In this case, one repetitive transmission may be included for each uplink period in one slot.
  • PUSCH physical uplink shared channel
  • PUSCH repetition transmission type A supports intra-slot frequency hopping and inter-slot frequency hopping
  • PUSCH repetition transmission type B supports inter-repetition frequency hopping and inter-slot frequency hopping.
  • the intra-slot frequency hopping method supported by PUSCH repetitive transmission type A is a method in which a terminal changes and transmits allocated resources in a frequency domain by a set frequency offset in two hops within one slot.
  • the starting RB of each hop can be expressed through [Equation 5].
  • RB offset represents a frequency offset between two hops through a higher layer parameter.
  • the number of symbols of the first hop can be expressed as ⁇ N PUSCH,s symb /2 ⁇
  • the number of symbols of the second hop can be expressed as N PUSCH,s symb - ⁇ N PUSCH,s symb /2 ⁇ .
  • N PUSCH,s symb is the length of PUSCH transmission in one slot, represented by the number of OFDM symbols.
  • the inter-slot frequency hopping method supported by PUSCH repetitive transmission types A and B is a method in which the UE changes and transmits allocated resources in the frequency domain by a set frequency offset for each slot.
  • the start RB during n s ⁇ slots can be expressed through [Equation 6].
  • n s ⁇ is the current slot number in multi-slot PUSCH transmission
  • RB start indicates the starting RB in the UL BWP and is calculated from the frequency resource allocation method.
  • RB offset represents a frequency offset between two hops through a higher layer parameter.
  • the inter-repetition frequency hopping method supported by PUSCH repeated transmission type B moves and transmits resources allocated in the frequency domain for one or a plurality of actual repetitions within each nominal repetition by a set frequency offset.
  • RB start (n) which is an index of a start RB in the frequency domain for one or a plurality of actual repetitions within the n-th nominal repetition, may follow [Equation 7] below.
  • n is an index of nominal repetition
  • RB offset represents an RB offset between two hops through a higher layer parameter.
  • the terminal may perform a procedure for reporting the capability 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 message requesting a capability report to a UE in a connected state.
  • the message may include a UE capability request for each radio access technology (RAT) type of the base station.
  • the request for each RAT type may include supported frequency band combination information.
  • UE capabilities for each RAT type may be requested through one RRC message container transmitted by the base station, or the base station sends a terminal capability inquiry message including a terminal capability request for each RAT type. It can be included multiple times and delivered to the terminal. That is, the UE capability query is repeated multiple times within one message, and the UE can configure and report a UE capability information message corresponding to the UE capability information message multiple times.
  • a UE capability request for MR-DC including NR, LTE, and EN-DC (E-UTRA-NR dual connectivity) can be requested.
  • the terminal capability inquiry message is generally initially transmitted after the terminal connects to the base station, the base station may request it under any condition when necessary.
  • the terminal receiving the UE capability report request from the base station configures the terminal capability according to the RAT type and band information requested from the base station.
  • the terminal receiving the UE capability report request from the base station configures the terminal capability according to the RAT type and band information requested from the base station.
  • the terminal receives a list of LTE and/or NR bands from the base station as a UE capability request, the terminal configures a band combination (BC) for EN-DC and NR stand alone (SA). That is, BC candidate lists for EN-DC and NR SA are configured based on the bands requested to the base station through FreqBandList. In addition, bands have priorities in the order described in FreqBandList.
  • BC band combination
  • SA stand alone
  • the terminal completely removes those for NR SA BCs from the configured BC candidate list. This operation may occur only when the LTE base station (eNB) requests the "eutra" capability.
  • the terminal removes fallback BCs from the candidate list of BCs configured in the above step.
  • the fallback BC means a BC that can be obtained by removing a band corresponding to at least one SCell from any BC, and since the BC before removing the band corresponding to at least one SCell can already cover the fallback BC, can be omitted.
  • This step also applies to MR-DC, ie LTE bands as well.
  • the remaining BCs after this step are the final "candidate BC list".
  • the terminal selects BCs to be reported by selecting BCs suitable for the requested RAT type from the final "candidate BC list".
  • the terminal configures the supportedBandCombinationList in a predetermined order. That is, the terminal configures the BC and UE capabilities to be reported according to the order of the preset rat-Type. (nr -> eutra-nr -> eutra).
  • featureSetCombination is configured for the configured supportedBandCombinationList, and a list of "candidate feature set combination" is configured in the candidate BC list from which the list for fallback BC (including capabilities of the same or lower level) is 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 is included in both containers of UE-MRDC-Capabilities and UE-NR-Capabilities.
  • the feature set of NR includes only UE-NR-Capabilities.
  • the terminal After the terminal capabilities are configured, the terminal transmits a terminal capability information message including the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission/reception management for the corresponding terminal.
  • FIG. 18 illustrates an example of a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 18 is a diagram illustrating a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation according to an embodiment of the present disclosure.
  • the radio protocols of the next-generation mobile communication system are NR SDAP (Service Data Adaptation Protocol 1825 and 1870), NR PDCP (Packet Data Convergence Protocol 1830 and 1865), and NR RLC (Radio Link Control) in the terminal and NR base station, respectively. 1835 and 1860) and NR MAC (Medium Access Control 1840 and 1855).
  • NR SDAP Service Data Adaptation Protocol 1825 and 1870
  • NR PDCP Packet Data Convergence Protocol 1830 and 1865
  • NR RLC Radio Link Control
  • the main functions of the NR SDAPs 1825 and 1870 may include some of the following functions.
  • mapping function between a QoS flow and a data bearer for uplink and downlink mapping between a QoS flow and a DRB for both DL and UL
  • the terminal may receive a RRC message to set whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel, and SDAP header is set, the 1-bit NAS QoS reflection setting indicator (NAS reflective QoS) and the 1-bit AS QoS reflection setting indicator (AS reflective QoS) of the SDAP header allow the UE to send uplink and downlink QoS flows and data bearer mapping information can be instructed to update or reset.
  • the SDAP header may include QoS flow ID information indicating QoS.
  • the QoS information may be used as data processing priority and scheduling information to support smooth service.
  • the main functions of the NR PDCP may include some of the following functions.
  • the reordering function of the NR PDCP device refers to a function of rearranging PDCP PDUs received from a lower layer in order based on a PDCP SN (sequence number), and a function of transmitting data to an upper layer in the rearranged order can include
  • the reordering function of the NR PDCP device may include a function of immediately forwarding without considering the order, and may include a function of reordering and recording lost PDCP PDUs, and the lost PDCP
  • a function of reporting the status of PDUs to the transmitter may be included, and a function of requesting retransmission of lost PDCP PDUs may be included.
  • the main functions of the NR RLC may include some of the following functions.
  • In-sequence delivery of the NR RLC device in the above means a function of sequentially delivering RLC SDUs received from a lower layer to an upper layer.
  • the in-sequence delivery function of the NR RLC device may include a function of reassembling and transmitting the received RLC SDU when one RLC SDU is divided into several RLC SDUs, and transmits the received RLC PDUs It may include a function of reordering based on RLC sequence number (SN) or PDCP sequence number (SN), and may include a function of reordering and recording lost RLC PDUs.
  • a function of reporting the status to the transmitter may be included, and a function of requesting retransmission of lost RLC PDUs may be included.
  • In-sequence delivery of the NR RLC device may include, when there is a lost RLC SDU, a function of delivering only RLC SDUs prior to the lost RLC SDU to the upper layer in order, or Even if there are RLC SDUs, if a predetermined timer expires, a function of sequentially delivering all received RLC SDUs to an upper layer before the timer starts may be included.
  • the in-sequence delivery function of the NR RLC device may include a function of sequentially delivering all RLC SDUs received up to now to a higher layer if a predetermined timer expires even if there is a lost RLC SDU.
  • RLC PDUs may be processed in the order in which they are received (regardless of the order of serial numbers and sequence numbers, in the order of arrival) and delivered to the PDCP device regardless of order (out-of sequence delivery).
  • segments stored in a buffer or to be received later may be received, reconstructed into one complete RLC PDU, processed, and transmitted to the PDCP device.
  • the NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.
  • the out-of-sequence delivery function of the NR RLC device refers to a function of immediately delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and originally one RLC SDU is multiple RLC When received divided into SDUs, it may include a function of reassembling and forwarding them, and may include a function of storing RLC SNs or PDCP SNs of received RLC PDUs and arranging them in order to record lost RLC PDUs.
  • the NR MACs 1840 and 1855 may be connected to several NR RLC layer devices configured in one terminal, and the main functions of the NR MAC may include some of the following functions.
  • the NR PHY layers 1845 and 1850 channel code and modulate higher layer data, convert OFDM symbols into OFDM symbols and transmit them through a radio channel, or demodulate OFDM symbols received through a radio channel, channel decode, and transmit the data to the upper layer. can be done
  • the detailed structure of the radio protocol structure may be variously changed according to a carrier (or cell) operating method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure having a single structure for each layer, such as 1800. On the other hand, when the base station transmits data to the terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal have a single structure up to RLC as in 1810, but a protocol for multiplexing the PHY layer through the MAC layer structure will be used.
  • CA carrier aggregation
  • the base station and the terminal have a single structure up to RLC as in 1820, but the PHY layer through the MAC layer A protocol structure for multiplexing is used.
  • the present invention provides a method for repeatedly transmitting a PDCCH through multiple transmission points (TRPs) to improve PDCCH reception reliability of a terminal. Specific methods are described in detail in the following examples.
  • higher signaling in the present disclosure is a method of transmitting a signal from a base station to a terminal using a downlink data channel of a physical layer, or from a terminal to a base station using an uplink data channel of the physical layer, It may also be referred to as RRC signaling, PDCP signaling, or a medium access control (MAC) control element (MAC CE).
  • RRC signaling PDCP signaling
  • MAC CE medium access control
  • a PDCCH (s) allocated to a PDSCH to which cooperative communication is applied has a specific format, or a PDCCH (s) allocated to a PDSCH to which cooperative communication is applied is cooperative.
  • a specific indicator indicating whether or not communication is applied, or PDCCH(s) allocating a PDSCH to which cooperative communication is applied are scrambled with a specific RNTI, or cooperative communication is assumed in a specific interval indicated by a higher layer, etc. It is possible to use various methods.
  • the terminal receiving the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.
  • determining the priority between A and B means selecting a higher priority according to a predetermined priority rule and performing a corresponding operation or lower priority. It may be variously referred to as omitting or dropping an operation for.
  • Non-Coherent Joint Transmission may be used for a UE to receive PDSCHs from multiple TRPs.
  • the 5G wireless communication system can support not only services requiring high transmission rates, but also services with very short transmission delays and services requiring high connection density, unlike conventional ones.
  • a wireless communication network including multiple cells, transmission and reception points (TRPs), or beams
  • coordinated transmission between each cell, TRP or/and beam increases the strength of a signal received by a terminal or each cell , TRP or/and inter-beam interference control can be efficiently performed to satisfy various service requirements.
  • Joint Transmission is a typical transmission technology for the above-described cooperative communication, and transmits a signal to one UE through a plurality of different cells, TRPs, or/and beams, thereby transmitting the strength or throughput of the signal received by the UE.
  • JT Joint Transmission
  • the characteristics of the channel between each cell, TRP or / and beam and the terminal may be significantly different, and in particular, a channel supporting non-coherent precoding between each cell, TRP or / and beam
  • N-JT Non-Coherent Joint Transmission
  • individual precoding, MCS, resource allocation, TCI indication, etc. are required according to channel characteristics of each cell, TRP or/and link between beams and UEs. can
  • the aforementioned NC-JT transmission includes a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH), and an uplink control channel. (physical uplink control channel, PUCCH).
  • PDSCH physical downlink shared channel
  • PDCCH physical uplink shared channel
  • transmission information such as precoding, MCS, resource allocation, and TCI is indicated as DL DCI
  • the transmission information must be independently indicated for each cell, TRP or/and beam. This becomes a major factor in increasing a payload required for DL DCI transmission, which may adversely affect reception performance of a PDCCH transmitting DCI. Therefore, it is necessary to carefully design the tradeoff between DCI information amount and control information reception performance for JT support of PDSCH.
  • FIG. 19 illustrates an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 19 is a diagram illustrating an antenna port configuration and resource allocation example for transmitting a PDSCH using cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
  • examples for PDSCH transmission are described for each technique of joint transmission (JT), and examples for allocating radio resources for each TRP are shown.
  • C-JT coherent joint transmission
  • TRP A 1905 and TRP B 1910 transmit single data (PDSCH) to UE 1915, and joint precoding may be performed on multiple TRPs.
  • PDSCH data
  • This may mean that DMRS is transmitted through the same DMRS ports so that TRP A (1905) and TRP B (1910) transmit the same PDSCH.
  • each of TRP A (1905) and TRP B (1910) may transmit DRMS to the UE through DMRS port A and DMRS B.
  • the terminal may receive one DCI information for receiving one PDSCH demodulated based on DMRS transmitted through DMRS port A and DMRS B.
  • NC-JT non-coherent joint transmission
  • a PDSCH is transmitted to the terminal 1935 for each cell, TRP or/and beam, and individual precoding may be applied to each PDSCH.
  • Each cell, TRP or/and beam may transmit different PDSCHs or different PDSCH layers to the UE to improve throughput compared to transmission of a single cell, TRP or/and beam.
  • each cell, TRP or / and beam repeatedly transmits the same PDSCH to the UE, thereby improving reliability compared to single cell, TRP or / and beam transmission.
  • TRP a cell, a TRP, or/and a beam are collectively referred to as TRP below.
  • DCIs of various forms, structures, and relationships may be considered in order to simultaneously allocate a plurality of PDSCHs to one UE.
  • FIG. 20 illustrates an example of configuration of downlink control information (DCI) for cooperative communication in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 20 shows downlink control information (DCI) for NC-JT in which each TRP transmits a different PDSCH or a different PDSCH layer to a terminal in a wireless communication system according to an embodiment of the present disclosure. It is a diagram showing an example of the configuration of.
  • Formats between the independent DCIs may be the same or different, and payloads between the DCIs may also be the same or different.
  • each PDSCH control or allocation degree of freedom can be completely guaranteed, but when each DCI is transmitted in different TRPs, a coverage difference for each DCI may occur, resulting in deterioration of reception performance.
  • Case #2 (2005) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used in single PDSCH transmission.
  • control information DCI for the PDSCHs of (N-1) additional TRPs is transmitted, and each of these DCIs is dependent on the control information for the PDSCHs transmitted from the serving TRP.
  • DCI#0 which is control information for the PDSCH transmitted from the serving TRP (TRP#0)
  • Case #3 (2010) is different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used in single PDSCH transmission. ) PDSCHs are transmitted, one control information for the PDSCHs of (N-1) additional TRPs is transmitted, and this DCI is dependent on the control information for the PDSCHs transmitted from the serving TRP.
  • DCI#0 which is control information for the PDSCH transmitted from the serving TRP (TRP#0)
  • 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.
  • information not included in sDCI such as a bandwidth part (BWP) indicator or carrier indicator, may follow the DCI (DCI#0, normal DCI, nDCI) of the serving TRP.
  • BWP bandwidth part
  • each PDSCH control or allocation degree of freedom may be limited according to the content of the information element included in the sDCI, but the reception performance of the sDCI can be adjusted, and Case #1 (2000) or Case #2 Compared to (2005), the complexity of DCI blind decoding of the terminal may be reduced.
  • Case #4 (2015) is different from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used during single PDSCH transmission.
  • control information for PDSCHs transmitted from (N-1) additional TRPs is transmitted in the same DCI (Long DCI) as control information for PDSCHs transmitted from serving TRPs.
  • the terminal can obtain control information on PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI.
  • the complexity of DCI blind decoding of the UE may not increase, but the degree of freedom in PDSCH control or allocation may be low, such as the number of cooperative TRPs being limited according to the long DCI payload limit.
  • sDCI may refer to various auxiliary DCIs, such as shortened DCI, secondary DCI, or normal DCI (DCI format 1_0 to 1_1 described above) including PDSCH control information transmitted from cooperative TRP, and has special restrictions. If not specified, the description is similarly applicable to the various auxiliary DCIs.
  • case #1 (2000), case #2 (2005), and case #3 (2010) in which one or more DCI (PDCCH) is used to support NC-JT are based on multiple PDCCHs. It is classified as NC-JT, and the case of the aforementioned case #4 (2015) in which a single DCI (PDCCH) is used to support NC-JT can be classified as a single PDCCH-based NC-JT.
  • a CORESET in which DCI of serving TRP (TRP#0) is scheduled and a CORESET in which DCI of cooperative TRPs (TRP#1 to TRP#(N-1)) are scheduled can be distinguished.
  • a method for distinguishing CORESETs there may be a method of distinguishing through an upper layer indicator for each CORESET, a method of distinguishing through beam setting for each CORESET, and the like.
  • a single DCI schedules a single PDSCH having a plurality of layers instead of scheduling a plurality of PDSCHs, and the above-described plurality of layers can be transmitted from a plurality of TRPs.
  • the connection relationship between the layer and the 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 simultaneously receives one or more PDSCHs in one BWP", “when the terminal simultaneously receives two or more TCIs (Transmission Configuration It is possible to interpret variously according to the situation, such as “when PDSCH is received based on Indicator) indication” and "when the PDSCH received by the terminal is associated with one or more DMRS port groups". For convenience, one expression is used.
  • the radio protocol structure for NC-JT can be used in various ways according to TRP deployment scenarios. 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 information exchange between cooperative TRPs such as CSI, scheduling, and HARQ-ACK takes more than 2 ms), it is similar to S20 of x4. It is possible to obtain a robust characteristic against delay by using an independent structure for each TRP from the RLC layer (DC-like method).
  • CA-like method a method using a structure based on MAC layer multiplexing
  • a UE supporting C-JT/NC-JT may receive parameters or setting values related to C-JT/NC-JT from higher layer settings, and set RRC parameters of the UE based on this.
  • the UE may utilize a UE capability parameter, for example, tci-StatePDSCH.
  • the UE capability parameter for example, tci-StatePDSCH
  • the maximum value of 128 means a value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in capability signaling of the UE.
  • a series of configuration processes from higher layer configuration to MAC CE configuration may be applied to a beamforming instruction or a beamforming change command for at least one PDSCH in one TRP.
  • a multi-DCI based multi-TRP transmission method will be described.
  • a downlink control channel for NC-JT transmission may be set based on the Multi-PDCCH.
  • CORESET or search space for each TRP can be set in at least one of the following cases.
  • the CORESET setting information set for the upper layer may include an index value, and the TRP transmitting the PDCCH in the corresponding CORESET can be distinguished by the index value for each set CORESET. That is, in a set of CORESETs having the same higher layer index value, it may be considered that the same TRP transmits the PDCCH or the PDCCH scheduling the PDSCH of the same TRP is transmitted.
  • the index for each CORESET described above may be named as CORESETPoolIndex, and it may be considered that the PDCCH is transmitted from the same TRP for CORESETs for which the same CORESETPoolIndex value is set. In the case of a CORESET in which the CORESETPoolIndex value is not set, it can be considered that the default value of CORESETPoolIndex is set, and the above-described default value may be 0.
  • the terminal may consider that the base station transmits using single-TRP without using the multi-DCI-based multi-TRP transmission method.
  • each PDCCH-Config may include PDCCH settings for each TRP. That is, a list of CORESETs for each TRP and/or a list of search spaces for each TRP can be configured in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config are considered to correspond to a specific TRP. can do.
  • TRPs corresponding to the corresponding CORESETs can be distinguished through beams or beam groups set for each CORESET. For example, when the same TCI state is set in a plurality of CORESETs, it can be considered that the corresponding CORESETs are transmitted through the same TRP or a PDCCH scheduling the PDSCH of the same TRP is transmitted in the corresponding CORESET.
  • a beam or beam group is configured for each search space, and through this, TRPs for each search space can be distinguished. For example, when the same beam/beam group or TCI state is set in multiple search spaces, it can be considered that the same TRP transmits the PDCCH in the search space, or the PDCCH scheduling the PDSCH of the same TRP is transmitted in the search space. have.
  • the above setting may be independent for each cell or each BWP.
  • no CORESETPoolIndex value may be set for a specific SCell.
  • NC-JT transmission is configured in the PCell, whereas 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 may follow FIG. 16. If the UE does not set the CORESETPoolIndex for each of all CORESETs in the upper layer signaling PDCCH-Config, the UE can ignore the CORESET Pool ID field 1655 in the corresponding MAC-CE 1650. If the UE can support the multi-DCI-based multi-TRP transmission method, that is, if each CORESET in the upper layer signaling PDCCH-Config has a different CORESETPoolIndex, the UE can support the CORESET Pool in the corresponding MAC-CE 1650.
  • the TCI state in the DCI included in the PDCCH transmitted in CORESETs having the same CORESETPoolIndex value as the ID field 1655 can be activated. For example, if the value of the CORESET Pool ID field 1655 in the corresponding MAC-CE 1650 is 0, the TCI state in the DCI included in the PDCCH transmitted from CORESETs having a CORESETPoolIndex of 0 follows the activation information of the corresponding MAC-CE. can
  • the terminal When the terminal is configured to use the multi-DCI based multi-TRP transmission method from the base station, that is, when the number of CORESETPoolIndex types each of the plurality of CORESETs included in PDCCH-Config, which is higher layer signaling, exceeds one, or When each CORESET has a different CORESETPoolIndex, the UE can know that the following restrictions exist for PDSCHs scheduled from PDCCHs in each CORESET having two different CORESETPoolIndexes.
  • the UE can apply the TCI states indicated from each PDCCH to different CDM groups, respectively. That is, two or more TCI states may not be applied to one CDM group.
  • the terminal can expect that the bandwidth part indicated from the PDCCH in each CORESET having two different CORESETPoolIndex is the same and the subcarrier interval is also the same.
  • each PDCCH fully includes information on PDSCHs scheduled from PDCCHs in each CORESET having two different CORESETPoolIndex.
  • a single-DCI based multi-TRP transmission method will be described.
  • a downlink control channel for NC-JT transmission may be set based on a single-PDCCH.
  • the number of TCI states may be used as a method of indicating the number of TRPs transmitting the corresponding PDSCH. That is, if the number of TCI states indicated in the DCI scheduling the PDSCH is two, it can be regarded as single PDCCH-based NC-JT transmission, and if the number of TCI states is one, it can be regarded as single-TRP transmission.
  • the TCI states indicated by the above DCI can correspond to one or two TCI states among the TCI states activated by MAC-CE.
  • TCI states of DCI correspond to the two TCI states activated by MAC-CE
  • the correspondence between the TCI codepoint indicated by DCI and the TCI states activated by MAC-CE is established, and the MAC corresponding to the TCI codepoint -This may be the case when there are two TCI states activated by CE.
  • the UE can consider that the base station can transmit based on the single-DCI based multi-TRP method. can At this time, at least one codepoint indicating two TCI states in the TCI state field may be activated through Enhanced PDSCH TCI state activation/deactivation MAC-CE.
  • FIG. 21 illustrates an example of an enhanced PDSCH TCI state activation/deactivation MAC-CE (enhanced PDSCH TCI state activation/deactivation MAC-CE) structure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 21 is a diagram illustrating an Enhanced PDSCH TCI state activation/deactivation MAC-CE structure.
  • the corresponding MAC-CE may include a TCI state ID 0,2 field 2115 in addition to the TCI state ID 0,1 field 2110. This means 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 DCI, and if the base station instructs the corresponding codepoint to the terminal, the terminal transmits two TCI states. can be instructed. If the value of the C 0 field 2105 is 0, the corresponding MAC-CE cannot include the TCI state ID 0,2 field 2115, which is the TCI state for the 0th codepoint of the TCI state field included in the DCI. It means that one TCI state corresponding to ID 0,1 is activated.
  • the above setting may be independent for each cell or each BWP.
  • a PCell may have up to two activated TCI states corresponding to one TCI codepoint, whereas a specific SCell may have up to one activated TCI states corresponding to one TCI codepoint.
  • NC-JT transmission is configured in the PCell, it can be considered that NC-JT transmission is not configured in the aforementioned SCell.
  • the UE may be instructed to use different single-DCI based multi-TRP PDSCH repeated transmission schemes (eg, TDM, FDM, SDM) according to the value indicated by the DCI field and higher layer signaling configuration from the base station.
  • Table 31 shows a method of distinguishing between single or multiple TRP-based techniques indicated to the terminal according to the value of a specific DCI field and higher layer signaling configuration.
  • Number of TCI states (column 2): This means the number of TCI states indicated by the TCI state field in DCI, and can be one or two.
  • Number of CDM groups (column 3): This means the number of different CDM groups of DMRS ports indicated by the antenna port field in DCI. It can be 1, 2 or 3.
  • RepetitionNumber setting and indication conditions (column 4): 3 conditions depending on whether repetitionNumber is set for all TDRA entries that can be indicated by the Time Domain Resource Allocation field in DCI and whether the actually indicated TDRA entry has repetitionNumber setting can have
  • Condition 1 At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field includes settings for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in DCI is for repetitionNumber greater than 1. Including settings
  • Condition 2 At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field includes settings for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in DCI includes settings for repetitionNumber. if not
  • repetitionScheme setting indicates whether or not repetitionScheme, which is higher layer signaling, is set.
  • RepetitionScheme which is upper layer signaling, may be set to one of 'tdmSchemeA', 'fdmSchemeA', and 'fdmSchemeB'.
  • Transmission scheme indicated to the UE (column 6): This means single or multiple TRP schemes indicated according to each combination (column 1) represented by Table 31 above.
  • Single-TRP Means PDSCH transmission based on single TRP. If the UE has configured the pdsch-AggegationFactor in higher layer signaling PDSCH-config, the UE can be scheduled for repeated single TRP-based PDSCH transmission as many times as configured. Otherwise, the UE may be scheduled for single TRP-based PDSCH transmission.
  • Single-TRP TDM scheme B refers to repeated PDSCH transmission based on time resource division between single TRP-based slots.
  • the terminal repeatedly transmits the PDSCH in the time dimension as many times as the number of slots of repetitionNumber 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 corresponding to the number of repetitionNumber times, and the same TCI state is applied to each repeated transmission of the PDSCH.
  • This technique is similar to the slot aggregation method in that it performs repeated PDSCH transmission between slots on time resources, but is different from slot aggregation in that it can dynamically determine whether or not to indicate repeated transmission based on the Time Domain Resource Allocation field in the DCI. have.
  • Multi-TRP SDM Means a multi-TRP based spatial resource division PDSCH transmission method. This is a method of dividing and receiving layers from each TRP. Although it is not a repetitive transmission method, 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 may 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 Multi-TRP-based frequency resource division PDSCH transmission method. It has one PDSCH transmission location, so it is not repetitive transmission like multi-TRP SDM, but it increases the amount of frequency resources to increase the coding rate. It is a technique that can transmit with high reliability by lowering the .
  • Multi-TRP FDM scheme A may 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 by the Frequency Domain Resource Allocation field is N, and the remaining floor (N/ 2) RBs apply and receive 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, even-numbered PRGs apply the first TCI state, and odd-numbered PRGs receive the second TCI state.
  • Multi-TRP FDM scheme B refers to a multiple TRP-based frequency resource division PDSCH repeated transmission scheme, and has two PDSCH transmission locations so that PDSCHs can be repeatedly transmitted to each location.
  • Multi-TRP FDM scheme B may also apply two TCI states indicated through the TCI state field in DCI to frequency resources that do not overlap with 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 by the Frequency Domain Resource Allocation field is N, and the remaining floor (N/ 2) RBs apply and receive 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, even-numbered PRGs apply the first TCI state, and odd-numbered PRGs receive the second TCI state.
  • Multi-TRP TDM scheme A Means a repeated PDSCH transmission scheme within a multi-TRP based time resource division slot.
  • the terminal has two PDSCH transmission locations in one slot, and the first reception location may be determined based on the start symbol and symbol length of the PDSCH indicated through the Time Domain Resource Allocation field in DCI.
  • the start symbol of the second reception position of the PDSCH may be a position obtained by applying a symbol offset as much as StartingSymbolOffsetK, which is higher layer signaling, from the last symbol of the first transmission position, and the transmission position may be determined by the indicated symbol length. If the higher layer signaling, StartingSymbolOffsetK, is not set, the symbol offset may be regarded as 0.
  • Multi-TRP TDM scheme B Means a repeated PDSCH transmission scheme between multiple TRP-based time resource division slots.
  • the UE has one PDSCH transmission location within one slot, and receives repeated transmission based on the start symbol and symbol length of the same PDSCH during slots as many times as the repetitionNumber times indicated through the Time Domain Resource Allocation field in DCI. can do. If repetitionNumber is 2, the UE may receive repeated PDSCH transmissions of the first and second slots by applying the first and second TCI states, respectively. If repetitionNumber is greater than 2, the terminal may use different TCI state application methods according to which tciMapping, which is higher layer signaling, is set.
  • tciMapping is set to cyclicMapping, the first and second TCI states are applied to the first and second PDSCH transmission positions, respectively, and the same TCI state application method is applied to the remaining PDSCH transmission positions. If tciMapping is set to sequentialMapping, the first TCI state is applied to the first and second PDSCH transmission positions, and the second TCI state is applied to the third and fourth PDSCH transmission positions. The same applies to the PDSCH transmission position.
  • the terminal may receive a set of RLM RSs from the base station through RadioLinkMonitoringRS in RadioLinkMonitoringConfig, which is higher layer signaling for each downlink bandwidth part of SpCell, and the specific higher layer signaling structure may follow [Table 32].
  • the following [Table 33] may indicate the settable or selectable number of RLM RSs for each specific purpose according to the maximum number of SSBs (Lmax) per half frame.
  • Lmax maximum number of SSBs
  • NLR-RLM RSs can be used for link recovery or radio link monitoring according to the Lmax value
  • NRLMs among the NLR-RLM RSs can be used for radio link monitoring.
  • RadioLinkMonitoringRS If the UE does not receive higher layer signaling, RadioLinkMonitoringRS, and the UE sets the TCI state for receiving the PDCCH in the control resource set, and at least one CSI-RS is included in the TCI state, the following RLM RS selection method RLM RS can be selected by following them.
  • the UE may select an RLM RS as a reference RS of an activated TCI state to be used for PDCCH reception.
  • the UE may select the RLM-RS as the reference RS of QCL-TypeD. The terminal does not expect two QCL-TypeDs to be set in one activated TCI state.
  • the UE does not expect an aperiodic or semi-persistent RS to be selected as the RLM RS.
  • the RLM RS is selected based on the RLM RS selection methods 1 to 3, among the reference RSs of the TCI state set in the control resource set for PDCCH reception, and the shorter the period of the search space to which the control resource set is connected, the higher the Based on the priority, the RLM RS is selected from the reference RS of the TCI state set in the control resource set connected to the search space of the shortest period. If there are a plurality of control resource sets connected to a plurality of search spaces having the same period, RLM RS selection is performed from the reference RS of the TCI state set to the higher control resource set index.
  • FIG. 22 illustrates an example of an RLM RS selection process in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 22 is a diagram illustrating an RLM RS selection process according to an embodiment of the present disclosure.
  • the reference RS of the TCI state set in each control resource set is shown.
  • RLM RS selection method 4 uses the TCI state set in the control resource set connected to the search space of the shortest period, but the periods of search space #1 (2201) and search space #3 (2203) is the same, among control resource set #1 (2205) and control resource set #2 (2206) connected to each search space, the reference RS of the TCI state set in control resource set #2 having the highest index is the most suitable for RLM RS selection. It can be used as a high priority.
  • PC CSI-RS #2 2210 is the most First, it can be selected as RLM RS.
  • the reference RS of QCL-TypeD can be a selection candidate by the RLM RS selection method 2 among the reference RSs of the TCI state set in the control resource set #1 having priority, but the corresponding RS is semi-persistent Since it is an RS (2209), it is not selected as an RLM RS by the RLM RS selection method 3 above.
  • reference RSs of TCI state set in control resource set #3 can be considered as the next priority, and by the RLM RS selection method 2, the reference RS of QCL-TypeD can be a selection candidate, and the reference RS can be selected periodically. Since it is a (periodic) RS, P CSI-RS#4 2212 can be selected as the second RLM RS by the RLM RS selection method 3 above. Accordingly, the finally selected RLM RSs may be P CSI-RS#2 or P CSI-RS#4 (2213).
  • a non-SFN scheme in which time or frequency resources are separated and repeatedly transmitted through different TRPs for control resource sets connected to each of a plurality of search spaces that are typically explicitly connected by higher layer signaling, and 1
  • different control resource sets may be connected to a plurality of search spaces explicitly connected by higher layer signaling, or the same control resource set may be connected to all search spaces.
  • a method in which different control resource sets are connected to each other can be considered as a multiple TRP-based PDCCH repeated transmission method by considering that each control resource set is transmitted in a different TRP.
  • a method in which the same control resource set is connected to all search spaces can be considered as a single TRP-based repeated PDCCH transmission method by considering that all of them are transmitted in the same TRP.
  • the UE receives upper layer configuration information about the TCI state for the PDCCH and PDSCH and receives the MAC-CE indicating activation of the corresponding TCI state.
  • Receive PDCCH and PDSCH In this case, the operation of which default beam is to be received is defined.
  • the above-described basic beam operations of the PDCCH and PDSCH may need to be redefined as SFN transmission for the PDCCH and PDSCH is introduced.
  • the UE may dynamically switch reception of a single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmissions through a capability report of the UE.
  • scheduling may be dynamically performed for a single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmissions through DCI.
  • the terminal may be able to receive only the SFN PDSCH transmission. Therefore, in a specific situation, the terminal can receive only SFN transmission.
  • additional definition may be required for basic beam operations of PDCCH and PDSCH depending on when the corresponding time point is.
  • basic beam operations of the PDCCH and the PDSCH are described in detail.
  • TRP transmission reception point
  • a PDCCH (s) allocated to a PDSCH to which cooperative communication is applied has a specific format, or a PDCCH (s) allocated to a PDSCH to which cooperative communication is applied is cooperative.
  • a specific indicator indicating whether or not communication is applied, or PDCCH(s) allocating a PDSCH to which cooperative communication is applied are scrambled with a specific RNTI, or cooperative communication is assumed in a specific interval indicated by a higher layer, etc. It is possible to use various methods.
  • the terminal receiving the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.
  • a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions.
  • an embodiment of the present disclosure is described using a 5G system as an example, but the embodiment of the present disclosure can be applied to other communication systems having a similar technical background or channel type.
  • LTE or LTE-A mobile communication and mobile communication technology developed after 5G may be included in this. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modification without significantly departing from the scope of the present disclosure as determined by a person skilled in the art.
  • the contents of this disclosure are applicable to FDD and TDD systems.
  • higher layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.
  • SIB System Information Block
  • L1 signaling may be signaling corresponding to at least one or a combination of one or more of signaling methods using the following physical layer channels or signaling.
  • Non-scheduling DCI eg, DCI that is not for the purpose of scheduling downlink or uplink data
  • determining the priority between A and B means selecting a higher priority according to a predetermined priority rule and performing a corresponding operation or lower priority. It may be variously referred to as omitting or dropping an operation for.
  • a PDCCH repetition transmission method considering multiple TRPs will be described.
  • Repetitive PDCCH transmission considering multiple TRPs may have various methods depending on how to apply each TCI state to be applied when transmitting the PDCCH in each TRP to the above-described various parameters used for PDCCH transmission.
  • various parameters used for PDCCH transmission to which different TCI states are applied may include CCE, PDCCH candidate group, control resource set, search space, and the like.
  • soft combining, selection, and the like may be considered as a reception method of the UE.
  • the following five methods may exist for repeated PDCCH transmission through multiple TRPs, and the base station configures at least one of the five methods to the UE through higher layer signaling, instructs the UE through L1 signaling, or transmits at least one of the five methods to the UE through higher layer signaling It can be set and instructed by a combination of L1 signaling.
  • Method 1-1 Method of repeatedly transmitting a plurality of PDCCHs having the same payload
  • Method 1-1 is a method of repeatedly transmitting a plurality of pieces of control information having the same DCI format and payload.
  • Each of the above-described control information may indicate information for scheduling repeatedly transmitted PDSCHs, for example, ⁇ PDSCH#1, PDSCH#2, ..., PDSCH#Y ⁇ repeatedly transmitted over a plurality of slots.
  • the fact that the payload of each control information that is repeatedly transmitted is the same means that the PDSCH scheduling information of each control information, such as the number of repeated PDSCH transmissions, the time axis PDSCH resource allocation information, that is, the slot offset (K_0) between the control information and PDSCH#1 and the PDSCH It can be expressed that the number of symbols, frequency axis PDSCH resource allocation information, DMRS port allocation information, PDSCH-to-HARQ-ACK timing, PUCCH resource indicator, etc. are all the same.
  • the terminal can improve reception reliability of control information by soft combining repetitive transmission control information having the same payload.
  • the terminal needs to know in advance the resource location and the number of repeated transmissions of control information to be repeatedly transmitted.
  • the base station may indicate in advance resource configurations of the time domain, frequency domain, and spatial domain of the above-described repeated transmission control information.
  • control information is repeatedly transmitted on the time axis, control information is repeatedly transmitted over different CORESETs, or repeatedly transmitted over different search space sets within one CORESET, or different PDCCH monitoring occasions within one CORESET and one search space set. It can be repeatedly transmitted over.
  • Units of repetitively transmitted resources (CORESET units, search space set units, PDCCH monitoring occasion units) and locations of repetitive transmission resources (PDCCH candidate index, etc.) on the time axis may be indicated through higher layer settings of the base station.
  • the number of repeated transmissions of the PDCCH and/or the list and transmission pattern of TRPs participating in repeated transmissions may be explicitly indicated, and higher layer indication or MAC-CE/L1 signaling may be used as an explicit indication method.
  • the list of TRPs may be indicated in the form of the TCI state or the aforementioned QCL assumption.
  • control information When control information is repeatedly transmitted in the frequency axis, the control information may be repeatedly transmitted over different CORESETs, repeatedly transmitted over different PDCCH candidates within one CORESET, or repeatedly transmitted for each CCE.
  • a unit of repetitively transmitted resources and a location of repetitive transmission resources on the frequency axis may be indicated through higher layer settings of the base station.
  • the number of repeated transmissions and/or the list of TRPs participating in repeated transmissions and transmission patterns may be explicitly indicated, and higher layer indication or MAC-CE/L1 signaling may be used as an explicit indication method.
  • the list of TRPs may be indicated in the form of the TCI state or the aforementioned QCL assumption.
  • control information When control information is repeatedly transmitted along the spatial axis, the control information can be repeatedly transmitted over different CORESETs or by setting two or more TCI states in one CORESET.
  • DCI including scheduling information for PUSCH or PDSCH may be transmitted from a base station to a terminal through a PDCCH.
  • FIG. 23 illustrates an example of a process of generating a PDCCH repeatedly transmitted through two TRPs in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 23 is a diagram illustrating a process of generating a PDCCH repeatedly transmitted through two TRPs according to an embodiment of the present disclosure.
  • the base station generates DCI (2350), attaches the CRC to the DCI payload (2351), goes through channel coding (2352), scrambling (2353) and modulation (2354) to generate the PDCCH. can be (2355). Thereafter, the base station may copy the generated PDCCH a plurality of times (2356, 2357, 2358) and transmit it using a specific resource (eg, time, frequency, transmission beam, etc.) (2359). That is, all coded bits for the PDCCH repeatedly transmitted in each TRP may be the same. In this way, in order to have the same coded bits, the information value for each DCI field in the PDCCH may also be set to be the same.
  • a specific resource eg, time, frequency, transmission beam, etc.
  • all fields (TDRA, FDRA, TCI, antenna ports, ...) included in DCI information may be set to have the same value.
  • the same value may generally be interpreted as one meaning, but may be interpreted as a plurality of meanings when it includes or corresponds to a plurality (eg, two) values as described above by a special setting. A detailed description related to this will be described below.
  • repeated PDCCH transmission can be performed based on a single TRP, and repeated PDCCH transmission can be performed based on multiple TRPs when IDs of CORESETs connected to the search space are all different or TCI states of CORESETs are all different.
  • the base station maps two PDCCHs to TRP A and TRP B, respectively, and in this case, the two PDCCHs of each TRP can be transmitted separately in the time domain.
  • the repeated PDCCH transmissions classified in the time domain can be repeated in a slot based, subslot based, or mini-slot based time unit.
  • the terminal and the base station may consider the following method for the PDCCH repetition operation described above.
  • each CORESETPoolindex can be considered in addition to the CORESET described above.
  • the number of repetitions of the PDCCH may be independently increased, and accordingly, the above-described methods may be considered in combination at the same time.
  • the base station may preset information on which domain the PDCCH is repeatedly transmitted in the terminal through an RRC message. For example, in the case of repeated PDCCH transmission in the time domain, the base station selects any one of the above-described slot based, subslot based, or mini-slot based time units. Information about whether one is repeated can be set in advance in the terminal. In the case of repeated PDCCH transmission in the frequency domain, the base station may pre-configure information on repetition based on any one of CORESET, bandwidth part (BWP), or component carrier (CC) in the terminal. In the case of repeated PDCCH transmission in terms of the spatial domain, the base station may preset information related to a beam for repeated PDCCH transmission in the terminal through configuration for each QCL type.
  • RRC message For example, in the case of repeated PDCCH transmission in the time domain, the base station selects any one of the above-described slot based, subslot based, or mini-slot based time units. Information about whether one is repeated can be set in advance
  • the information listed above may be combined and transmitted to the terminal through an RRC message. Therefore, the base station can repeatedly transmit the PDCCH according to preset information through the RRC message, and the terminal can repeatedly receive the PDCCH according to preset information through the RRC message.
  • Method 1-2 Method of repeatedly transmitting a plurality of control information that may have different DCI formats and/or payloads
  • Method 1-2 is a method of repeatedly transmitting a plurality of pieces of control information that may have different DCI formats and/or payloads. These control information schedules repeated PDSCH transmissions, and the number of repeated PDSCH transmissions indicated by each control information may be different.
  • PDCCH#1 indicates information for scheduling ⁇ PDSCH#1, PDSCH#2, ..., PDSCH#Y ⁇
  • PDCCH#2 indicates ⁇ PDSCH#2, ..., PDSCH#Y ⁇
  • ... , PDCCH#X may indicate information for scheduling ⁇ PDSCH Y ⁇ .
  • This method of repeatedly transmitting control information has the advantage of reducing the total delay time required for repeated transmission of control information and PDSCH compared to Method 1-1.
  • the payload of each repeatedly transmitted control information may be different in this method, soft combining of the repeatedly transmitted control information may not be possible, and thus reliability may be lower than method 1-1.
  • the terminal may not need to know in advance the resource location and number of repeated transmissions of control information to be repeatedly transmitted, and the terminal can independently decode and process each of the repeatedly transmitted control information. If the UE decodes a plurality of repetitive transmission control information scheduling the same PDSCH, only the first repetitive transmission control information can be processed and second and subsequent repetitive transmission control information can be ignored. Alternatively, the resource location and the number of repeated transmissions of control information to be repeatedly transmitted may be indicated in advance, and the indication method may be the same as the method described in method 1 above.
  • Method 1-3 Method of repeatedly transmitting a plurality of pieces of control information that may have different DCI formats and/or payloads
  • Method 1-3 is a method of repeatedly transmitting a plurality of pieces of control information, each of which may have a different DCI format and/or payload. At this time, each control information repeatedly transmitted has the same DCI format and payload. Since the plurality of control information in Method 1-2 cannot be soft-combined, reliability may be lower than that of Method 1-1. this can be long Method 1-3 is a method using the advantages of Methods 1-1 and 1-2, and the total delay time required for repeated transmission of control information and PDSCH is reduced compared to Method 1-1 and is higher than Method 1-2. Control information can be transmitted with reliability.
  • Soft combine of Method 1-1 and individual decoding of Method 1-2 may be used to decode and soft combine the repeatedly transmitted control information. For example, among repeated transmissions of a plurality of pieces of control information that may have different DCI formats and/or payloads, firstly transmitted control information is decoded as in Method 1-2 and repeated transmissions of the decoded control information are performed. Soft combining can be performed as in Method 1-1 above.
  • the base station may select and configure one of the method 1-1, method 1-2, or method 1-3 for repeated transmission of control information.
  • the repeated control information transmission scheme may be explicitly instructed by the base station to the terminal through higher layer signaling.
  • the control information repetition transmission method may be indicated in combination with other setting information.
  • a higher layer configuration indicating a repeated PDSCH transmission scheme may be combined with an instruction for repeating control information transmission.
  • Method 1-1 when the PDSCH is instructed to be repeatedly transmitted in an intra-slot TDM scheme, it can be interpreted that the control information is repeatedly transmitted according to Method 1-1.
  • the above method 1-1, method 1-2 or method 1-3 for repeated transmission of control information is performed through higher layer signaling or L1 signaling can be selected through
  • the base station may explicitly instruct the terminal to transmit control information repeatedly through settings such as an upper layer.
  • the control information repetition transmission unit may be indicated in combination with other setting information.
  • a higher layer configuration indicating a repeated PDSCH transmission scheme may be combined with the control information repetition transmission unit. If the PDSCH is instructed to be repeatedly transmitted using the FDM method, it can be interpreted that the control information is repeatedly transmitted using the FDM or SDM method. This is because there is no effect of reducing delay time due to repeated PDSCH transmission.
  • the control information may be interpreted as being repeatedly transmitted in intra-slot TDM, FDM, or SDM.
  • the PDSCH when the PDSCH is instructed to be repeatedly transmitted in TDM between multiple slots, it can be selected through higher layer signaling so that control information can be repeatedly transmitted through TDM between multiple slots, TDM within a slot, FDM or SDM.
  • Methods 1-4 may transmit different TCI states meaning transmission from multiple TRPs by applying different CCEs in the PDCCH candidate group to improve PDCCH reception performance without repeated PDCCH transmission.
  • This method is not a repetitive transmission of the PDCCH, but since different CCEs in the PDCCH candidate group are transmitted by applying different TCI states in each TRP, it can be a method of obtaining spatial diversity within the PDCCH candidate group.
  • Different CCEs to which different TCI states are applied can be separated in a time or frequency dimension, and it is necessary for the terminal to know in advance the location of resources to which different TCI states are applied.
  • the UE may receive different CCEs to which different TCI states are applied within the same PDCCH candidate group and independently decode or decode at once.
  • Method 1-5 may apply a plurality of TCI states to all CCEs in the PDCCH candidate group and transmit the SFN method in order to improve PDCCH reception performance without repeated PDCCH transmission.
  • this method is not PDCCH repetitive transmission, it may be a method of obtaining spatial diversity through SFN transmission at the same CCE location within the PDCCH candidate group.
  • the UE may receive CCEs at the same location to which different TCI states are applied within the same PDCCH candidate group and independently decode or decode at once using some or all of the plurality of TCI states.
  • the UE may report UE capabilities related to soft combining to the BS when repeatedly transmitting the PDCCH, and there may be several methods for this. Specific methods may be as follows.
  • the UE may report only whether or not soft combining is possible when repeatedly transmitting a PDCCH to the base station as UE capability in the form of enabling or disabling.
  • the base station determines whether the soft combining of the terminal is possible to the most flexible degree (for example, the terminal is at the LLR level It is determined that soft combining is possible), and the setting related to repeated PDCCH transmission can be notified to the UE with maximum flexibility when setting the PDCCH transmission.
  • the base station performs soft combining between control resource sets or search spaces in which the terminal has different configurations, soft combining between PDCCH candidates within the same aggregation level, or different aggregation Assuming that soft combining between PDCCH candidates between levels is possible, the corresponding setting may be notified to the UE.
  • the base station if the terminal reports information that soft combining is possible during repeated PDCCH transmission to the base station as a terminal capability, the base station most conservatively determines the level of soft combining that the terminal can perform (e.g., the terminal It is determined that soft combining is possible at the OFDM symbol level), and the PDCCH repetitive transmission-related setting can be notified to the UE in the most restrictive manner when setting the PDCCH transmission.
  • the base station assumes that the terminal can perform soft combining between a plurality of control resource sets having the same configuration or soft combining between PDCCH candidates between the same aggregation levels, and performs the configuration for the terminal. may be notified.
  • the UE determines the possible degree of soft combining when repeatedly transmitting a PDCCH to the base station.
  • Levels can be divided and reported as terminal capabilities. That is, among each signal level generated from the reception operation process of the terminal, the terminal checks the signal level to which soft combining can be applied to repeated PDCCH transmissions, and the terminal can report such information to the base station as a terminal capability. have.
  • the terminal can inform that soft combining is possible at the OFDM symbol level, can inform that soft combining is possible at the modulation symbol level, and soft combine at the LLR level. It can tell you that innings are possible.
  • the base station may notify an appropriate setting so that the terminal can perform soft combining according to the reported terminal capability.
  • the UE may transmit necessary constraints to enable soft combining as UE capabilities. For example, the terminal may report to the base station that the configuration of each control resource set including two repeated PDCCHs should be the same. As another example, the terminal may report to the base station that the two repeated PDCCH candidates should have at least the same aggregation level.
  • the UE When the UE receives repeated PDCCH transmission from the base station, it can report which PDCCH repeated transmission scheme is supported through UE capability.
  • the terminal may report to the base station that the method 1-5 (SFN transmission method) is supported.
  • the terminal may report to the base station that intra-slot TDM, inter-slot TDM, or FDM scheme among method 1-1 (a method of repeatedly transmitting a plurality of PDCCHs having the same payload) is supported.
  • the terminal may report the maximum value of the time interval between two repeated PDCCHs to the base station.
  • the base station determines the time interval between the two repeated PDCCHs when performing TDM-based repeated PDCCH transmission to the terminal based on the information. It may need to be adjusted to less than 4 OFDM symbols.
  • the terminal may report the number of times of blind decoding consumed to the base station as the terminal capability. For example, the terminal sets the number of blind decoding consumed when receiving repeated PDCCH transmissions to 1, 2, or 3 is reported to the base station, and the base station assumes that the terminal consumes as much as the reported number of blind decoding when receiving repeated PDCCH transmissions, and the search space so as not to exceed the maximum number of blind decoding times that the terminal can use within a slot or span. And settings related to the control resource set may be delivered to the terminal.
  • the above-described UE capability reporting methods may be configured in a combination of two or more when actually applied.
  • applications based on combinations of various UE capability reporting methods are possible, but detailed descriptions will be omitted.
  • a method for configuring repeated PDCCH transmissions to enable soft combining during repeated PDCCH transmissions will be described.
  • Method 1-1 a method of repeatedly transmitting multiple PDCCHs having the same payload
  • whether or not soft combining of the UE is possible is determined.
  • information indicating that there is an explicit connection (linkage or association) between repeated PDCCH candidates is set by higher layer signaling, indicated by L1 signaling, or a combination of higher layer signaling or L1 signaling. can be set up and instructed. More specifically, various connection methods may exist as follows.
  • the base station may configure PDCCH-repetition-config in PDCCH-config, which is higher layer signaling, for repeated PDCCH transmission and explicit connectivity-related configuration to the terminal, and PDCCH-repetition-config may include the following information.
  • PDCCH repetitive transmission method One of TDM, FDM, and SFN
  • the base station may configure repeated PDCCH transmission to the terminal through higher layer signaling. For example, if the PDCCH repetitive transmission scheme is set to SFN, the control resource set index is set to 1 as a control resource set-search space combination to be used for repeated PDCCH transmission, and the search space index is not set, the terminal selects index 1 It can be expected that the PDCCH will be repeatedly transmitted through the method 1-5 (SFN transmission method) in the control resource set.
  • the set control resource set is configured with one or a plurality of different TCI states by higher layer signaling, instructed by L1 signaling or MAC-CE signaling, or a combination of higher layer signaling and L1 signaling or MAC-CE signaling. can be set up and instructed.
  • the UE may not expect a search space index to be set within a control resource set-search space combination to be used during repeated PDCCH transmissions.
  • the repeated PDCCH transmission method is set to TDM or FDM, a total of 2 control resource set-search space combinations to be used for repeated PDCCH transmissions are set, and for the first combination, a control resource set index of 1 and a search space index are If the control resource set index 2 and the search space index are set to 2 for the 1 and 2 combinations, the terminal uses the two control resource set-search space combinations and repeats the PDCCH in the TDM or FDM method through the above method 1-1. can be expected to be transmitted.
  • each configured control resource set receives a plurality of TCI states that are the same or different from each other by higher layer signaling, or instructed by L1 signaling or MAC-CE signaling, or a combination of higher layer signaling, L1 signaling, or MAC-CE signaling. can be set and instructed.
  • the PDCCH repetitive transmission method is set to TDM or FDM
  • the UE can expect to set up to two control resource set-search space combinations to be used for repeated PDCCH transmission, and control resource set and search space combinations within each combination. You can expect all indexes to be set.
  • the values of the above 5 pieces of information can be updated without RRC resetting based on MAC-CE. If the base station does not configure PDCCH-repetition-config for the terminal, the terminal does not expect repeated transmission of the PDCCH, but can expect only single transmission of the PDCCH. All or at least one of the aggregation level, PDCCH candidate index, and frequency resources for the above-described explicit connectivity may be configured according to an explicit connectivity method described later.
  • the base station may add higher layer signaling to the searchSpace, which is higher layer signaling for the search space, and notify the UE.
  • a parameter called repetition which is additional higher layer signaling, may be set to on or off in searchSpace, which is higher layer signaling, so that the corresponding search space is used for repetitive transmission.
  • Search spaces for which Repetition is set to on may be one or two per bandwidth part. For example, if searchSpaceId is set to 1, controlResourceSetId is set to 1, and repetition is set to on in searchSpace, which is higher layer signaling for search space index 1, the terminal performs the above in control resource set 1 connected to search space 1. It can be expected that PDCCH repeated transmission is performed according to method 1-5 (SFN transmission method).
  • searchSpaceId is set to 1 in searchSpace, which is higher layer signaling for search space index 1
  • controlResourceSetId is set to 1
  • repetition is set to on
  • searchSpaceId is set to 2
  • controlResourceSetId is set to 2
  • repetition is set to on
  • the terminal performs the method 1-1 between the combination of control resource set 1 + search space 1 and control resource set 2 + search space 2. It can be seen that repeated PDCCH transmission is performed by TDM or FDM using TDM and FDM can be distinguished according to time and frequency settings through higher layer signaling of control resource sets 1 and 2 and search spaces 1 and 2.
  • aggregation levels or PDCCH candidate indexes for explicit connectivity specified in [PDCCH repetition setting method 1] may be set, and an explicit connection method to be described later So neither can be set, either can be set, or both can be set.
  • a method for indicating and setting through a combination of L1 signaling and higher layer signaling for multiple TRP-based PDSCH SFN transmission in a base station and a reception method in a terminal will be described.
  • the base station schedules the multi-TPSCH SFN transmission method to the terminal through DCI
  • the conditions of the DCI field and higher layer signaling may be as follows.
  • TCI state field in DCI It may indicate the codepoint of the TCI state field including two TCI states.
  • the number of CDM groups may be fixed to one, or may be one or more.
  • Time Domain Resource Allocation field in DCI There may be no restrictions on the field (for example, one of conditions 1, 2, or 3 for the Time Domain Resource Allocation field described in Table 31 above may be possible. ), only the above condition 3 (eg, when all TDRA entries do not set repetitionNumber, which is higher layer signaling), may be possible.
  • New higher layer signaling for multi-TRP based PDSCH SFN scheme may be additionally configured.
  • the UE in order to support the above-described multi-TRP based PDSCH scheme (eg, multi-TRP SDM, FDM scheme A, FDM scheme B, TDM scheme A, TDM scheme B), the UE is required to use a new multi-TRP based PDSCH SFN scheme.
  • Higher layer signaling can be expected not to be configured.
  • FIG. 24 illustrates an example of a multi-TRP based PDSCH SFN transmission method in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 24 is a diagram illustrating a multi-TRP based PDSCH SFN transmission method according to an embodiment of the present disclosure.
  • the base station instructs and configures the value of the above-described DCI field and higher layer signaling to the terminal, and then transmits the PDCCH to the terminal (2400).
  • TCI states #1 and #2 may be indicated through the TCI state field in the corresponding PDCCH, and time and frequency resource allocation information may be indicated through one Time Domain Resource Allocation field and one Frequency Domain Resource Allocation field, respectively.
  • the terminal may receive the PDSCH transmitted through SFN using two different TCI states (TCI states #1 and #2) at a resource location based on the corresponding time and frequency resource allocation information (2401, 2402). This can be equally applied to repetitive transmission of the SFN-based PDCCH.
  • the UE may receive the SFN transmitted PDCCH by applying two different TCI states within one control resource set (2450, 2451). Based on the DCI field information included in the PDCCH transmitted by the SFN, the UE transmits the SFN using two different TCI states (TCI states #1 and #2) at a resource location based on the corresponding time and frequency resource allocation information. PDSCH can be received (2452, 2453).
  • the terminal transmits SFN of the base station through higher layer signaling from the base station through base station-based Doppler correction (hereinafter, it can be named as base station-based SFN method) or the base station's SFN transmission method through terminal-based Doppler correction (hereinafter referred to as terminal-based SFN method). can be named according to the method.), one SFN transmission method of the base station can be set. The corresponding setting may be set for each bandwidth part or each carrier.
  • the configuration may use each configuration information for the PDCCH and the PDSCH, or may use one common configuration information for the PDCCH and the PDSCH. The UE may not expect that different schemes are applied to PDCCH and PDSCH for the type of SFN transmission scheme of the base station.
  • the terminal can expect that the same SFN transmission scheme is applied to the PDCCH and the PDSCH.
  • the terminal can expect the same SFN transmission scheme to be configured and applied to all control resource sets. That is, it may not be expected that the base station-based SFN scheme is configured and applied to some control resource sets and the terminal-based SFN scheme is applied to the remaining control resource sets.
  • the terminal may transmit to the base station whether the base station can dynamically change the reception operation for single TRP-based PDSCH transmission or SFN PDSCH transmission by reporting the terminal capability.
  • the UE capability report may be reported for each carrier or for each UE.
  • the base station may transmit the Enhanced PDSCH TCI state activation/deactivation MAC-CE to the terminal so that all codepoints in the TCI field in the DCI indicate two TCI states. That is, the terminal may not expect that at least one codepoint of the TCI field in the DCI indicates one TCI state when the corresponding terminal capability is not reported.
  • the base station may set whether or not to dynamically change the reception operation for single TRP-based PDSCH transmission or multiple TRP-based PDSCH SFN transmission through higher layer signaling, and the UE configures the corresponding higher layer signaling Depending on whether or not, one or two TCI states may be indicated through the TCI field in the DCI.
  • the base station can indicate one or two TCI states through the TCI field in the DCI using the TCI state activation MAC-CE for the PDSCH for the UE reporting the corresponding UE capability, and for the UE that has not reported the corresponding UE capability, For PDSCH, it is possible to indicate that all TCI codepoints have one TCI state or all TCI codepoints have two TCI states through the TCI field in DCI using TCI state activation MAC-CE for PDSCH.
  • the terminal may transmit to the base station whether the base station can dynamically change the reception operation for single TRP-based PDCCH transmission or SFN PDCCH transmission by reporting the terminal capability.
  • the UE capability report may be reported for each carrier or for each UE.
  • the base station may configure upper layer signaling for the coexistence of a control resource set in which one TCI state is activated and a control resource set in which two TCI states are activated, to the terminal.
  • Corresponding higher layer signaling may be set for each bandwidth part or for each carrier.
  • the corresponding configuration information from the base station may not be set, or it may be set so that coexistence of control resource sets in which different numbers of TCI states are activated is impossible, and if the terminal reports the terminal capability, the base station Corresponding configuration information from can be set to enable coexistence of control resource sets in which different numbers of TCI states are activated.
  • control resource sets in which different numbers of TCI states are activated may not exist, and the base station reports the corresponding terminal capability
  • some control resource sets have one TCI and the remaining control resource sets have two TCI states through TCI state activation MAC-CE for the PDCCH.
  • All control resource sets have one TCI through TCI state activation MAC-CE for PDCCH so that control resource sets in which different numbers of TCI states are activated do not coexist for a terminal that can be activated and has not reported the corresponding terminal capability. state, or all control resource sets can be activated to have two TCI states.
  • all control resource sets may be all control resource sets within a carrier or all control resource sets of all carriers configured in a terminal according to a UE capability reporting unit (per carrier or UE).
  • the two terminal capabilities of the terminal (capacity of the terminal regarding whether or not the reception operation for single TRP-based PDSCH transmission or SFN PDSCH transmission can be dynamically changed and whether or not the reception operation for single TRP-based PDCCH transmission or SFN PDCCH transmission can be dynamically changed
  • the UE may include and transmit two pieces of information in one single UE capability report.
  • the two terminal capabilities may be defined as independent terminal capabilities.
  • UE capability information for PDCCH can also be reported.
  • FIG. 25 illustrates an example of an enhanced PDCCH TCI state activation/deactivation MAC-CE (enhanced PDCCH TCI state activation/deactivation MAC-CE) structure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 25 is a diagram illustrating an Enhanced PDCCH TCI activation/deactivation MAC-CE structure according to an embodiment of the present disclosure.
  • 25 is a form in which a third octet 2510 is added to the structure of FIG. 9, 1st TCI state ID 2525 indicated by the corresponding MAC-CE for the indicated serving cell ID and control resource set index, and 2nd TCI state It can be seen that the 2nd TCI state ID is additionally indicated to activate the ID 2530.
  • the Serving Cell ID indicated by the corresponding Enhanced PDCCH TCI state activation/deactivation MAC-CE is included in simultaneousTCI-UpdateList1-r16 or simultaneousTCI-UpdateList2-r16, which is higher layer signaling, simultaneousTCI-UpdateList1-r16 or simultaneousTCI-UpdateList2-r16
  • simultaneousTCI-UpdateList1-r16 or simultaneousTCI-UpdateList2-r16 For other included serving cell IDs, the 1st TCI state ID and 2nd TCI state ID indicated by the corresponding MAC-CE can be simultaneously applied to the control resource set index indicated by the corresponding MAC-CE.
  • the serving cell IDs included in simultaneousTCI-UpdateList1-r16 are 1 to 4, and the serving cell ID, control resource set index, 1st TCI state ID, and 2nd TCI state ID indicated through the corresponding MAC-CE are 2, If 1, 0, 1, TCI state IDs 0 and 1 are simultaneously activated for control resource set 1 existing in serving cells 1, 3, and 4 through the corresponding MAC-CE.
  • the UE when the UE receives higher layer configuration information about TCI states for PDCCH and PDSCH and receives PDCCH and PDSCH until receiving MAC-CE indicating activation of the corresponding TCI state It describes which default beam to receive.
  • the UE receives higher layer signaling tci-StatesPDCCH-ToAddList, which is the TCI state setting for the PDCCH, and receives the MAC-CE for activating the TCI state for the control resource set, the UE receives the initial access for PDCCH reception (initial It can be assumed that the SSB checked in access) has a QCL relationship (ie, it can be assumed that the DMRS of the PDCCH and the SSB checked during initial access have a QCL relationship).
  • the UE's DMRS of the PDSCH and the SSB checked during initial access are mutually exclusive. It can be assumed that QCL-TypeA and QCL-TypeD have a QCL relationship.
  • the PDCCH for the multi-TRP based SFN PDCCH and PDSCH transmission mentioned in the above embodiment 4-1, configuration based on higher layer signaling, indication based on L1 signaling, or configuration of higher layer signaling and L1 signaling
  • the PDCCH until the UE receives higher layer configuration information about the TCI state for the PDCCH and PDSCH and receives the MAC-CE indicating activation of the corresponding TCI state
  • description will be made on which default beam to receive.
  • the terminal may define terminal capabilities capable of informing the base station that reception of a single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmissions can be dynamically switched.
  • the UE can dynamically switch reception of a single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmissions. That is, for a corresponding terminal, the base station may dynamically perform scheduling for single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmission through DCI. For example, the number of TCI states indicated by the TCI state field in the DCI may be adjusted and indicated.
  • the UE can only receive SFN PDCCH and SFN PDSCH transmission. Therefore, since the UE can receive only SFN PDCCH and SFN PDSCH transmissions in a specific situation or time point, additional definition of basic beam operation of PDCCH and PDSCH may be required depending on when the corresponding time point is defined.
  • the corresponding point in time can be determined based on two criteria as follows. The criterion for the corresponding time point may be determined in advance with a common understanding between the UE and the base station, or the base station may set a specific time point to the UE through higher layer signaling.
  • the UE may be able to receive only the SFN PDCCH and SFN PDSCH transmission, and at that time, the PDCCH And it may be after MAC-CE reception for TCI state indication for PDSCH. That is, the UE may be able to receive the PDCCH and the PDSCH even based on a single TRP rather than the SFN method before receiving the MAC-CE for indicating the TCI state for the PDCCH and the PDSCH.
  • the UE uses the SSB and QCL relationships confirmed by the DMRS of the PDCCH and the PDSCH during initial access. Assuming you have it, you can use it for receiving.
  • the UE may be able to receive only the SFN PDCCH and SFN PDSCH transmission, and at that time, the PDCCH And it may be after receiving TCI state configuration information for PDSCH or configuration information on SFN PDCCH and SFN PDSCH. Therefore, since reception of both the PDCCH and the PDSCH may have to be performed by the SFN method after receiving the corresponding information, one of the following various methods can be used for determining the basic beam for SFN reception of the PDCCH and the PDSCH. can
  • the UE may store received power information (eg, L1-RSRP information) for each of the plurality of SSBs received during initial access.
  • the SSB checked and used during initial access may have the largest value among corresponding received power information items.
  • the second highest received power It can be assumed that PDCCH and PDSCH reception have a QCL relationship for an SSB having information. Therefore, when receiving the PDCCH and PDSCH, both the SSB used for initial access and the SSB having the second highest received power information can be reference RSs of QCL-TypeA and QCL-TypeD.
  • the UE After the UE receives the TCI state configuration information for the PDCCH and the PDSCH until receiving the MAC-CE for the TCI state of the PDCCH and the PDSCH, the UE transmits the first and second TCI states among the TCI state configuration information of the PDSCH to the PDCCH and It can be considered as a basic beam when receiving PDSCH. Therefore, when receiving the PDCCH and the PDSCH, both the first and second TCI states among the TCI state configuration information of the PDSCH may become reference RSs of QCL-TypeA and QCL-TypeD.
  • the UE After the UE receives the TCI state configuration information for the PDCCH and the PDSCH and before receiving the MAC-CE for the PDCCH and the TCI state of the PDSCH, the UE receives the first and second TCIs among the TCI state configuration information of the PDCCH for PDCCH reception. state is used, and for PDSCH reception, the first and second TCI states among TCI state configuration information of PDSCH may be considered as a basic beam.
  • both the first and second TCI states among the TCI state configuration information of the PDCCH can be reference RSs of QCL-TypeA and QCL-TypeD
  • the first and second TCI states among the TCI state configuration information of the PDSCH Both TCI states can be reference RSs of QCL-TypeA and QCL-TypeD.
  • the same TCI states as those of PDSCH may be used.
  • the first TCI state may be considered as a basic beam when receiving PDCCH and PDSCH. Therefore, both the SSB and the first TCI state among the TCI state configuration information of the PDSCH, which were checked and used during initial access when receiving the PDCCH and PDSCH, can become reference RSs of QCL-TypeA and QCL-TypeD.
  • some of the TCI state configuration information of the PDSCH includes all channel parameters (eg, Doppler Shift, Doppler Spread, Average Delay, Delay Spread) are set, but certain parameters (eg, Average Delay, Delay Spread) can be set to be ignored.
  • the method of ignoring the corresponding specific parameters may be notified to the terminal through configuration through higher layer signaling, indication through L1 signaling, and a combination of configuration through higher layer signaling and indication through L1 signaling.
  • TCI state#1 has QCL-TypeA as the type of qcl-info1, has NZP CSI-RS#1 as its reference RS, and dropParameterType in qcl-info1 of the corresponding TCI state.
  • Type1 Average Delay, Delay Spread
  • Type2 Delay Spread
  • Type3 Doppler Shift, Doppler Spread
  • the terminal is the reference RS of qcl-info1 of TCI state#1
  • the channel parameter information obtained through NZP CSI-RS#1 is Average Delay and Delay Spread, and through this, the TRP that is different from the reference RS of the TCI state setting information of other indexes to which the intact QCL-TypeA can be indicated It can be implicitly recognized that it is transmitted from.
  • the UE After the UE receives the TCI state configuration information for the PDCCH and the PDSCH until receiving the MAC-CE for the PDCCH and the TCI state of the PDSCH, the UE can indicate the complete QCL-TypeA among the TCI state configuration information of the PDSCH.
  • the first TCI state among the TCI states to which the method in which the th TCI state and channel parameters that can be delivered through the TCI state are partially ignored (eg, the setting of the dropParameterType, etc.) is applied is used as the primary beam when receiving the PDCCH and PDSCH.
  • the first TCI state that can indicate the complete QCL-TypeA among the TCI state configuration information of the PDSCH can be the reference RS of QCL-TypeA and QCL-TypeD, and can be transmitted through the TCI state.
  • the reference RS of the first TCI state among the TCI states to which a method in which some channel parameters are ignored (eg, the dropParameterType setting, etc.) is applied is the reference RS for the remaining channel parameters excluding the channel parameters ignored according to the setting, , can be a reference RS of QCL-TypeD.
  • 26A illustrates an example of a terminal operation for primary beams of a PDCCH and a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • 26B illustrates an example of an operation of a base station for primary beams of a PDCCH and a PDSCH in a wireless communication system according to various embodiments of the present disclosure.
  • FIGS. 26A and 26B are diagrams illustrating operations of a base station and a terminal for primary beams of a PDCCH and a PDSCH according to an embodiment of the present disclosure.
  • the terminal transmits information related to repeated PDCCH transmission (eg, at least one or part of PDCCH repetition transmission method, whether soft combining is possible, soft combining possible level, necessary constraints for soft combining, etc.) to the base station with terminal capability. May report (2600, 2650).
  • the UE may additionally report the UE capabilities for multi-TRP based SFN PDCCH and PDSCH transmission (eg, at least one or part of the UE capabilities mentioned in the 4-1 embodiment) to the base station (2601, 2651 ).
  • the base station may receive this and transmit configuration information for the PDCCH (eg, configuration information for the control resource set and search space) to the terminal (2602, 2652), and the base station additionally transmits configuration information for repeated PDCCH transmission (eg, configuration information for the control resource set and search space).
  • configuration information for the PDCCH eg, configuration information for the control resource set and search space
  • the base station additionally transmits configuration information for repeated PDCCH transmission (eg, configuration information for the control resource set and search space).
  • the base station may additionally transmit explicit connection configuration-related information (eg, aggregation level, PDCCH candidate group, frequency resource, etc.) to the terminal during repeated PDCCH transmissions (2604, 2654).
  • the base station may indicate and configure the multi-TRP based SFN PDCCH/PDSCH transmission scheme with L1 signaling, higher layer signaling, or a combination of L1 signaling and higher layer signaling (2605, 2655). This may be based on at least one of the various methods described in the fourth embodiment described above. If the UE is configured with higher layer signaling for the SFN PDCCH and the SFN PDSCH, the UE reports UE capability capable of informing the base station that reception of a single TRP-based PDSCH transmission and multiple TRP-based SFN PDSCH transmissions can be dynamically switched.
  • the terminal may perform a first PDCCH / PDSCH basic beam determination operation (2608, 2658), and the base station determines the PDCCH and PDSCH according to the corresponding first PDCCH / PDSCH basic beam to match understanding with the terminal.
  • PDSCH may be transmitted.
  • the UE uses DMRS of PDCCH and PDSCH Assuming that it has a QCL relationship with the SSB checked during initial access, it can be used for reception. If the start point at which only reception of SFN PDCCH and SFN PDSCH is possible follows [Criterion 6-2], that is, reception of SFN PDCCH and SFN PDSCH is only possible after receiving TCI state configuration information or SFN PDCCH and PDSCH configuration information.
  • the terminal may perform a second PDCCH / PDSCH basic beam determination operation (2607, 2657), and the base station transmits the PDCCH and PDSCH according to the corresponding second PDCCH / PDSCH basic beam to match understanding with the terminal can
  • the second PDCCH/PDSCH basic beam determination operation from after receiving the TCI state configuration information for the PDCCH and PDSCH to before receiving the MAC-CE for indicating the TCI state for the PDCCH and PDSCH, the UE performs the above [Method 6- 2-1] to [Method 6-2-5].
  • FIG. 27A illustrates an example of a structure of a terminal in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 27A is a diagram illustrating a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • a terminal may include a transceiver, which refers to a terminal receiving unit 2711 and a terminal transmitting unit 2712, a memory (not shown), and a terminal processing unit 2713 (or a terminal control unit or processor).
  • a transceiver refers to a terminal receiving unit 2711 and a terminal transmitting unit 2712, a memory (not shown), and a terminal processing unit 2713 (or a terminal control unit or processor).
  • the transmission/reception units 2711 and 2712, the memory and the terminal processing unit 2713 of the terminal may operate.
  • the components of the terminal are not limited to the above-described examples.
  • a terminal may include more or fewer components than the aforementioned components.
  • the transceiver, memory, and processor may be implemented in a single chip form.
  • the transmitting/receiving unit may transmit/receive signals with the base station.
  • the signal may include control information and data.
  • the transceiver unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting the frequency.
  • this is only one embodiment of the transceiver, and components of the transceiver are not limited to the RF transmitter and the RF receiver.
  • the transceiver 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 may store programs and data required for operation of the terminal.
  • the memory may store control information or data included in signals transmitted and received by the terminal.
  • the memory may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, there may be a plurality of memories.
  • the processor may control a series of processes so that the terminal can operate according to the above-described embodiment.
  • the processor may control components of the terminal to simultaneously receive a plurality of PDSCHs by receiving DCI composed of two layers.
  • the processors may perform component control operations of the terminal by executing a program stored in a memory.
  • FIG. 27B illustrates an example of a structure of a base station in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 27B is a diagram illustrating a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • a base station may include a base station receiving unit 2721 and a transmitting/receiving unit that refers to a base station transmitting unit 2722, a memory (not shown), and a base station processing unit 2723 (or a base station control unit or processor).
  • the transmission/reception units 2721 and 2722, the memory and the base station processing unit 2723 of the base station may operate.
  • components of the base station are not limited to the above-described examples.
  • a base station may include more or fewer components than those described above.
  • the transceiver, memory, and processor may be implemented in a single chip form.
  • the transmission/reception unit may transmit/receive signals with the terminal.
  • the signal may include control information and data.
  • the transceiver unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting the frequency.
  • this is only one embodiment of the transceiver, and components of the transceiver are not limited to the RF transmitter and the RF receiver.
  • the transceiver 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 may store programs and data necessary for the operation of the base station.
  • the memory may store control information or data included in signals transmitted and received by the base station.
  • the memory may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, there may be a plurality of memories.
  • the processor may control a series of processes so that the base station operates according to the above-described embodiment of the present disclosure.
  • the processor may configure and transmit two layers of DCIs including allocation information for a plurality of PDSCHs and may control each element of the base station.
  • There may be a plurality of processors, and the processors may perform a component control operation of the base station by executing a program stored in a memory.
  • a computer readable storage medium storing one or more programs (software modules) may be provided.
  • One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device.
  • the one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.
  • Such programs may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.
  • non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM.
  • EEPROM electrically erasable programmable read only memory
  • CD-ROM compact disc-ROM
  • DVDs digital versatile discs
  • It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these.
  • each configuration memory may be included in multiple numbers.
  • the program is provided through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a communication network consisting of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.
  • a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a communication network consisting of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.
  • the present disclosure relates generally to wireless communication systems, and more particularly to methods and apparatus for transmitting and receiving downlink control information and data in wireless communication systems.

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

Abstract

La présente divulgation se rapporte à un système de communication de 5ème génération (5G) ou pré-5G permettant de prendre en charge un débit de transmission de données supérieur à celui des systèmes de communication de 4ème génération (4G) tels que la technologie d'évolution à long terme (LTE). La présente divulgation, selon divers modes de réalisation, concerne un procédé permettant de faire fonctionner un terminal dans un système de communication sans fil, comprenant les étapes consistant : à recevoir un premier signal de commande provenant d'une station de base ; à générer un second signal de commande sur la base du premier signal de commande ; et à émettre le second signal de commande à la station de base.
PCT/KR2022/008270 2021-06-11 2022-06-13 Procédé et dispositif de transmission et de réception d'informations de commande de liaison descendante et de données dans un système de communication sans fil WO2022260498A1 (fr)

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KR1020210076347A KR20220167157A (ko) 2021-06-11 2021-06-11 무선 통신 시스템에서 하향링크 제어 정보 및 데이터를 전송 및 수신하기 위한 방법 및 장치

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Citations (2)

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CATT: "Discussion on HST-SFN transmission schemes", 3GPP DRAFT; R1-2104487, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210519 - 20210527, 12 May 2021 (2021-05-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052010810 *
OPPO: "Enhancements on multi-TRP based enhancement for PDCCH, PUCCH and PUSCH", 3GPP DRAFT; R1-2102379, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 7 April 2021 (2021-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052177096 *
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