WO2021187845A1 - Procédé destiné à transmettre un ack/nack basé sur le livre de codes harq-ack dans un système de communication sans fil et son dispositif - Google Patents

Procédé destiné à transmettre un ack/nack basé sur le livre de codes harq-ack dans un système de communication sans fil et son dispositif Download PDF

Info

Publication number
WO2021187845A1
WO2021187845A1 PCT/KR2021/003188 KR2021003188W WO2021187845A1 WO 2021187845 A1 WO2021187845 A1 WO 2021187845A1 KR 2021003188 W KR2021003188 W KR 2021003188W WO 2021187845 A1 WO2021187845 A1 WO 2021187845A1
Authority
WO
WIPO (PCT)
Prior art keywords
ack
harq
dci
sps
sps pdsch
Prior art date
Application number
PCT/KR2021/003188
Other languages
English (en)
Korean (ko)
Inventor
최경준
노민석
곽진삼
Original Assignee
주식회사 윌러스표준기술연구소
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 윌러스표준기술연구소 filed Critical 주식회사 윌러스표준기술연구소
Publication of WO2021187845A1 publication Critical patent/WO2021187845A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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

Definitions

  • the present specification relates to a wireless communication system, and to a method for transmitting ACK/NACK based on a HARQ-ACK codebook and an apparatus therefor.
  • 3GPP LTE(-A) defines uplink/downlink physical channels for physical layer signal transmission.
  • a physical uplink shared channel (PUSCH) that is a physical channel for transmitting data in uplink
  • a physical uplink control channel (PUCCH) for transmitting a control signal
  • a physical random An access channel Physical Random Access Channel, PRACH
  • a physical control format indicator channel for transmitting L1/L2 control signals, including a physical downlink shared channel (PDSCH) for transmitting data in downlink (Physical Control Format Indicator Channel, PCFICH), Physical Downlink Control Channel (PDCCH), Physical Hybrid ARQ Indicator Channel (Physical HARQ Indicator Channel, PHICH), and the like.
  • PCFICH Physical Control Format Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the downlink control channel is a channel for the base station to transmit uplink/downlink scheduling assignment control information, uplink transmission power control information, and other control information to one or more terminals. Since there is a limit to the resources available for the PDCCH that the base station can transmit at one time, different resources cannot be allocated to each terminal, and control information must be transmitted to any terminal by sharing the resources. For example, in 3GPP LTE(-A), 4 REs (Resource Elements) are combined to create REGs (Resource Element Groups), 9 CCEs (Control Channel Elements) are created, and one or multiple CCEs can be combined and sent. It informs the UE of the available resource, and multiple UEs can share and use the CCE.
  • REs Resource Elements
  • REGs Resource Element Groups
  • 9 CCEs Control Channel Elements
  • the search space may include a common search space defined for each base station and a terminal-specific or UE-specific search space defined for each terminal.
  • the UE performs decoding on the number of all possible CCE combination cases in the search space, and can know whether it corresponds to its own PDCCH through the user equipment (UE) identifier included in the PDCCH. Therefore, the operation of the terminal takes a long time to decode the PDCCH and consumes a lot of energy.
  • UE user equipment
  • the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or after the LTE system (Post LTE).
  • the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
  • mmWave very high frequency
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Sliding Window Superposition Coding
  • ACM advanced coding modulation
  • FBMC Filter Bank Multi Carrier
  • NOMA advanced access technologies, non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M Machine Type Communication
  • MTC Machine Type Communication
  • IoT an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to
  • 5G communication technology is implemented by techniques such as beam forming, MIMO, and array antenna.
  • cloud RAN cloud radio access network
  • a mobile communication system has been developed to provide a voice service while ensuring user activity.
  • the mobile communication system is gradually expanding its scope not only to voice but also to data services, and has now developed to the extent that it can provide high-speed data services.
  • a more advanced mobile communication system is required because there is a shortage of resources and users demand a higher speed service.
  • the base station may configure reception of a plurality of semi-persistent scheduling (SPS) PDSCHs in one cell for one terminal.
  • SPS semi-persistent scheduling
  • the period of the SPS PDSCH can be set by reducing it to 1 ms.
  • URLLC Ultra Reliable Low Latency Communication
  • An object of the present specification is to provide a method and apparatus for generating and transmitting ACK/NACK based on a HARQ-ACK codebook in a wireless communication system.
  • the present specification provides a method for transmitting ACK / NACK in a wireless communication system.
  • the method performed by the terminal receives the first configuration information that is configuration information of one or more semi-persistent scheduling (SPS) physical downlink shared channels (PDSCH) from the base station. to do; Receiving downlink control information (DCI) for the release (release) of the one or more SPS PDSCH from the base station; generating a HARQ-ACK codebook including an ACK/NACK bit indicating whether the DCI has been successfully received; and transmitting, to the base station, the HARQ-ACK codebook, wherein the DCI is a DCI for releasing any one of the one or more SPS PDSCHs received based on the first configuration information, and the HARQ-ACK
  • the codebook is generated including a position in which an ACK/NACK bit indicating whether or not the reception of the one or more SPS PDSCHs determined according to each of one or more HARQ process IDs is set is set, and an ACK/NACK bit indicating whether the reception of the DCI is successful , is characterized in that it is set
  • a terminal for performing a method for transmitting ACK/NACK in a wireless communication system comprising: a transceiver; a processor for controlling the transceiver, wherein the processor includes one or more semi-persistent scheduling (SPS) physical downlink shared channels (PDSCH) configuration information from the base station.
  • SPS semi-persistent scheduling
  • PDSCH physical downlink shared channels
  • Receiving information receiving downlink control information (DCI) for releasing the one or more SPS PDSCHs from the base station, and including an ACK/NACK bit indicating whether the DCI is successfully received generating a HARQ-ACK codebook, transmitting the HARQ-ACK codebook to the base station, and the DCI is a DCI for releasing any one of the one or more SPS PDSCHs received based on the first configuration information
  • the The HARQ-ACK codebook is generated including a position in which an ACK/NACK bit indicating whether or not reception of the one or more SPS PDSCHs determined according to each of one or more HARQ process IDs is set is set, and an ACK indicating whether the DCI is successfully received
  • the /NACK bit is characterized in that it is set at a position of the HARQ-ACK codebook determined according to a first HARQ process ID among the one or more HARQ process IDs indicated by the DCI.
  • the first configuration information includes a second HARQ process ID for any one of the one or more SPS PDSCHs, and the ACK/NACK bit indicating whether the DCI is successfully received is the second HARQ It is characterized in that it is set in the position of the HARQ-ACK codebook determined according to the process ID.
  • the second HARQ process ID is characterized in that it is determined based on an index of a slot in which any one of the one or more SPS PDSCHs is received.
  • the first configuration information includes at least one of the number of available HARQ processes, a configuration period of the one or more SPS PDSCHs, and an HARQ process offset
  • each of the available HARQ processes is the one Corresponds to the above HARQ process IDs
  • the at least one HARQ process ID is characterized in that it is determined based on the HARQ process offset.
  • the ACK/NACK bit indicating whether the DCI reception is successful is the lowest HARQ process ID among a plurality of HARQ process IDs for the one or more SPS PDSCHs or It is characterized in that it is set in the position of the HARQ-ACK codebook determined according to the highest HARQ process ID.
  • the ACK/NACK bit indicating whether the reception of the DCI is successful is the last slot among the slots configured to be received before the slot in which the DCI is received. It is set in the position of the HARQ-ACK codebook determined according to the HARQ process ID determined based on the index, and the slots are slots configured to receive the one or more SPS PDSCHs.
  • the ACK/NACK bit indicating whether the reception of the DCI is successful is the first slot among the slots configured to be received after the slot in which the DCI is received. It is set in the position of the HARQ-ACK codebook determined according to the HARQ process ID determined based on the index, and the slots are slots configured to receive the one or more SPS PDSCHs.
  • the ACK / NACK bit indicating whether the DCI reception is successful is set in the position of the HARQ-ACK codebook determined according to the HARQ process ID determined based on the index of the slot in which the DCI is received. characterized in that
  • the HARQ-ACK codebook is generated by additionally including NDI (New Data Indicator) values for the one or more SPS PDSCHs, and the ACK/NACK bit indicating whether the DCI is successfully received is the NDI It is characterized in that the value is set at a set position.
  • NDI New Data Indicator
  • the ACK/NACK bit indicating whether the DCI is successfully received is an NDI value for the last SPS PDSCH among the one or more SPS PDSCHs configured to be received before the slot in which the DCI is received. It is characterized in that it is set in position.
  • the HARQ-ACK codebook is for the first TB It is generated by additionally including an ACK / NACK bit and an ACK / NACK bit for the second TB, each of the one or more SPS PDSCHs includes only the first TB, and the ACK / NACK bit indicating whether the DCI is successfully received is, It is characterized in that it is set at a position where the ACK/NACK bit for the second TB is set.
  • the ACK/NACK bit indicating whether the DCI reception is successful is determined according to the HARQ process ID configured in the last slot among the slots configured to be received before the slot in which the DCI is received. - It is set in the position of the ACK codebook, and the slots are characterized in that the slots are configured to receive the one or more SPS PDSCHs.
  • the terminal when there are a plurality of the one or more SPS PDSCHs, receives, from the base station, second configuration information for a second SPS PDSCH group including a part of the plurality of SPS PDSCHs, and the first
  • the configuration information is configuration information for a first SPS PDSCH group including the remainder except for the second SPS PDSCH group among the plurality of SPS PDSCHs, and the first configuration information includes information about the first SPS PDSCH group ID.
  • the second configuration information includes information on the second SPS PDSCH group ID
  • the DCI includes information indicating the first SPS PDSCH group ID or the second SPS PDSCH group ID
  • the DCI is for release of one or more SPS PDSCHs included in the first SPS PDSCH group or the second SPS PDSCH group
  • the ACK/NACK bit indicating whether the DCI is successfully received is the DCI indicated It is characterized in that it is set in the position of the HARQ-ACK codebook set according to the HARQ process ID determined based on the first SPS PDSCH group ID or the second SPS PDSCH group ID.
  • the ACK/NACK bit indicating whether the DCI is successfully received is an N bit size bit.
  • N is an integer.
  • the terminal is capable of receiving the one or more SPS PDSCHs based on the configuration period of the one or more SPS PDSCHs
  • the HARQ-ACK codebook includes time domain resource allocation of the one or more SPS PDSCHs ( Time Domain Resource Assignment) based on a subcarrier spacing (Subcarrier Spacing, SCS) of a downlink channel in which the ACK/NACK bit indicating whether reception succeeds or not is set is generated, and the one or more SPS PDSCHs are received.
  • the ACK/NACK bit indicating whether the DCI is successfully received is any one of a plurality of SPS PDSCHs set in slots of the downlink channel. is set at a position where an ACK/NACK bit indicating whether reception is successful or not is set based on time domain resource allocation of
  • the link channel slots are characterized in that they correspond to slot intervals of the uplink channel.
  • the ACK/NACK bit indicating whether the DCI reception is successful is an ACK/NACK bit indicating whether reception is successful based on the time domain resource allocation of the first SPS PDSCH among the plurality of SPS PDSCHs. It is characterized in that it is set in a position where
  • the ACK/NACK bit indicating whether the DCI reception is successful is set based on the time domain resource allocation of the last SPS PDSCH among the plurality of SPS PDSCHs. It is characterized in that it is set in a position where
  • the HARQ-ACK codebook is a Type-3 codebook or a semi-static codebook.
  • the present specification provides a method of generating and transmitting ACK/NACK based on the HARQ-ACK codebook.
  • efficient ACK/NACK transmission is achieved by transmitting the ACK/NACK bit for downlink control information to a position set to transmit the ACK/NACK bit for the semi-persistent scheduling downlink shared channel. It has the effect that it is possible.
  • FIG. 1 shows an example of a radio frame structure used in a wireless communication system.
  • FIG. 2 shows an example of a downlink (DL)/uplink (UL) slot structure in a wireless communication system.
  • 3 is a diagram for explaining a physical channel used in a 3GPP system and a general signal transmission method using the corresponding physical channel.
  • FIG. 4 shows an SS/PBCH block for initial cell access in a 3GPP NR system.
  • 5 shows a procedure for transmitting control information and a control channel in a 3GPP NR system.
  • CORESET control resource set
  • PDCCH physical downlink control channel
  • FIG. 7 is a diagram illustrating a method of configuring a PDCCH search space in a 3GPP NR system.
  • FIG. 8 is a conceptual diagram illustrating carrier aggregation.
  • 9 is a diagram for explaining single-carrier communication and multi-carrier communication.
  • FIG. 10 is a diagram illustrating an example to which a cross-carrier scheduling technique is applied.
  • 11 and 12 are diagrams illustrating a method of determining an offset when the lowest subcarrier spacing of a Pcell and an Scell is different from each other according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a method of generating a type-1 HARQ-ACK codebook when the start times of frames of the first cell and the second cell do not match according to an embodiment of the present invention.
  • 14 to 18 are diagrams illustrating a method of generating a type-3 HARQ-ACK codebook according to an embodiment of the present invention.
  • 19 and 20 are diagrams illustrating a method for a UE to select an SPS PDSCH when subcarrier intervals of an uplink channel and a downlink channel are different.
  • 21 is a block diagram showing the configurations of a terminal and a base station, respectively, according to an embodiment of the present invention.
  • 22 is a flowchart illustrating a method of transmitting an ACK/NACK generated through a HARQ-ACK codebook performed by a terminal according to an embodiment of the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like.
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP (3rd Generation Partnership Project) long term evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA
  • LTE-A Advanced
  • 3GPP NR New Radio
  • eMBB enhanced Mobile BroadBand
  • URLLC Ultra-Reliable and Low Latency Communication
  • mMTC massive Machine Type Communication
  • the base station may include a next generation node B (gNB) defined in 3GPP NR.
  • a terminal may include user equipment (UE).
  • UE user equipment
  • the configuration of the terminal may indicate the configuration by the base station. Specifically, the base station may transmit a channel or a signal to the terminal to set a value of a parameter used in the operation of the terminal or a wireless communication system.
  • FIG. 1 shows an example of a radio frame structure used in a wireless communication system.
  • a radio frame (or radio frame) used in a 3GPP NR system may have a length of 10 ms ( ⁇ f max N f / 100) * T c ).
  • the radio frame consists of 10 equally sized subframes (subframes, SFs).
  • ⁇ f max 480*10 3 Hz
  • N f 4096
  • T c 1/( ⁇ f ref *N f,ref )
  • ⁇ f ref 15*10 3 Hz
  • N f,ref 2048.
  • a number from 0 to 9 may be assigned to each of 10 subframes in one radio frame.
  • a subframe of 1 ms length may consist of 2 ⁇ slots. At this time, the length of each slot is 2 - ⁇ ms. 2 ⁇ slots in one subframe may be numbered from 0 to 2 ⁇ - 1, respectively.
  • slots in one radio frame may be assigned a number from 0 to 10*2 ⁇ - 1, respectively.
  • the time resource may be divided by at least one of a radio frame number (or also referred to as a radio frame index), a subframe number (or referred to as a subframe index), and a slot number (or a slot index).
  • FIG. 2 shows an example of a downlink (DL)/uplink (UL) slot structure in a wireless communication system.
  • FIG. 2 shows the structure of a resource grid of a 3GPP NR system.
  • a slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • the OFDM symbol also means one symbol interval. Unless otherwise specified, an OFDM symbol may be simply referred to as a symbol.
  • One RB includes 12 consecutive subcarriers in the frequency domain.
  • a signal transmitted in each slot is represented by a resource grid consisting of N size, ⁇ grid, x * N RB sc subcarriers and N slot symb OFDM symbols. have.
  • N size, ⁇ grid, x represents the number of resource blocks (RBs) according to the subcarrier interval configuration factor ⁇ (x is DL or UL), and N slot symb represents the number of OFDM symbols in the slot.
  • the OFDM symbol may be referred to as a cyclic prefix OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-S-OFDM) symbol according to a multiple access scheme.
  • CP-OFDM cyclic prefix OFDM
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 14 OFDM symbols, but in the case of an extended CP, one slot may include 12 OFDM symbols. In a specific embodiment, the extended CP may be used only at a 60 kHz subcarrier interval. 2 illustrates a case in which one slot consists of 14 OFDM symbols for convenience of description, embodiments of the present invention may be applied to slots having other numbers of OFDM symbols in the same manner. Referring to FIG. 2 , each OFDM symbol includes N size, ⁇ grid, x * N RB sc subcarriers in the frequency domain. The type of subcarrier may be divided into a data subcarrier for data transmission, a reference signal subcarrier for transmission of a reference signal, and a guard band. The carrier frequency is also referred to as the center frequency (fc).
  • fc center frequency
  • One RB may be defined by N RB sc (eg, 12) consecutive subcarriers in the frequency domain.
  • N RB sc eg, 12
  • a resource composed of one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or a tone.
  • one RB may be composed of N slot symb * N RB sc resource elements.
  • Each resource element in the resource grid may be uniquely defined by an index pair (k, l) in one slot.
  • k is an index assigned from 0 to N size, ⁇ grid, x * N RB sc - 1 in the frequency domain
  • l may be an index assigned from 0 to N slot symb - 1 in the time domain.
  • the time/frequency synchronization of the terminal may need to be aligned with the time/frequency synchronization of the base station. This is because, only when the base station and the terminal are synchronized, the terminal can determine the time and frequency parameters required to perform demodulation of the DL signal and transmission of the UL signal at an accurate time.
  • Each symbol of a radio frame operating in time division duplex (TDD) or unpaired spectrum is at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol (flexible symbol). It may consist of any one.
  • a radio frame operating as a downlink carrier may consist of a downlink symbol or a flexible symbol
  • a radio frame operating as an uplink carrier is an uplink symbol or It may be composed of flexible symbols.
  • the downlink symbol downlink transmission is possible but uplink transmission is impossible
  • uplink symbol uplink transmission is possible but downlink transmission is impossible.
  • Whether the flexible symbol is used for downlink or uplink may be determined according to a signal.
  • Information on the type of each symbol may be composed of a cell-specific (cell-specific or common) RRC (radio resource control) signal.
  • information on the type of each symbol may be additionally configured as a UE-specific (UE-specific or dedicated) RRC signal.
  • the base station uses the cell-specific RRC signal to i) the period of the cell-specific slot configuration, ii) the number of slots having only downlink symbols from the beginning of the period of the cell-specific slot configuration, iii) the slot immediately following the slot having only the downlink symbol.
  • a symbol that is not composed of either an uplink symbol or a downlink symbol is a flexible symbol.
  • the base station may signal whether the flexible symbol is a downlink symbol or an uplink symbol with a cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change the downlink symbol or the uplink symbol composed of the cell-specific RRC signal to another symbol type.
  • the UE-specific RRC signal may signal the number of downlink symbols among N slot symb symbols of the corresponding slot and the number of uplink symbols among N slot symb symbols of the corresponding slot for each slot. In this case, the downlink symbol of the slot may be continuously configured from the first symbol of the slot to the i-th symbol.
  • the uplink symbol of the slot may be continuously configured from the j-th symbol to the last symbol of the slot (here, i ⁇ j).
  • a symbol that is not composed of either an uplink symbol or a downlink symbol in a slot is a flexible symbol.
  • a symbol type composed of the above RRC signal may be referred to as a semi-static DL/UL configuration.
  • the flexible symbol is a downlink symbol, an uplink symbol through dynamic slot format information (SFI) transmitted through a physical downlink control channel (PDCCH). , or a flexible symbol.
  • SFI dynamic slot format information
  • PDCH physical downlink control channel
  • Table 1 illustrates the dynamic SFI that the base station can indicate to the terminal.
  • D denotes a downlink symbol
  • U denotes an uplink symbol
  • X denotes a flexible symbol.
  • a maximum of two DL/UL switching can be allowed within one slot.
  • 3 is a diagram for explaining a physical channel used in a 3GPP system (eg, NR) and a general signal transmission method using the corresponding physical channel.
  • a 3GPP system eg, NR
  • the terminal When the power of the terminal increases or the terminal enters a new cell, the terminal performs an initial cell search operation (S101). Specifically, the terminal may synchronize with the base station in the initial cell search. To this end, the terminal may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station, and obtain information such as a cell index. Thereafter, the terminal may receive the physical broadcast channel from the base station to obtain broadcast information in the cell.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried on the PDCCH, thereby acquiring through the initial cell search. It is possible to obtain more specific system information than one system information (S102).
  • the system information received by the terminal is cell-common system information for correctly operating the terminal in a physical layer in RRC (Radio Resource Control, RRC), and is Remaining system information or a system information block. (System information blcok, SIB) 1 is referred to.
  • the terminal may perform a random access procedure with respect to the base station (steps S103 to S106).
  • the UE may transmit a preamble through a physical random access channel (PRACH) (S103), and receive a response message to the preamble from the base station through a PDCCH and a corresponding PDSCH (S104).
  • PRACH physical random access channel
  • S104 receive a response message to the preamble from the base station through a PDCCH and a corresponding PDSCH
  • the terminal transmits data including its identifier through a physical uplink shared channel (PUSCH) indicated by the uplink grant delivered through the PDCCH from the base station. It is transmitted to the base station (S105).
  • PUSCH physical uplink shared channel
  • the terminal waits for the reception of the PDCCH as an indication of the base station for collision resolution.
  • the terminal successfully receives the PDCCH through its identifier (S106)
  • the random access process ends.
  • the UE may acquire UE-specific system information necessary for the UE to properly operate in the physical layer in the RRC layer during the random access process.
  • the UE obtains UE-specific system information from the RRC layer, the UE enters the RRC connected mode (RRC_CONNECTED mode).
  • the RRC layer is used to generate and manage messages for control between the terminal and a radio access network (RAN). More specifically, in the RRC layer, the base station and the terminal broadcast cell system information necessary for all terminals in the cell, delivery management of paging messages, mobility management and handover, measurement report of the terminal and control thereof, terminal Storage management including capacity management and instrument management can be performed.
  • the RRC signal since the update of the signal (hereinafter, the RRC signal) transmitted from the RRC layer is longer than the transmission/reception period (ie, the transmission time interval, TTI) in the physical layer, the RRC signal can be maintained unchanged for a long period. have.
  • the UE receives PDCCH/PDSCH (S107) and a physical uplink shared channel (PUSCH)/physical uplink control channel (PUCCH) as a general uplink/downlink signal transmission procedure. may be transmitted ( S108 ).
  • the UE may receive downlink control information (DCI) through the PDCCH.
  • DCI may include control information such as resource allocation information for the terminal.
  • the format of the DCI may vary depending on the purpose of use.
  • Uplink control information (UCI) transmitted by the terminal to the base station through the uplink is a downlink/uplink ACK/NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). ) and the like.
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • CQI, PMI, and RI may be included in CSI (channel state information).
  • the UE may transmit control information such as HARQ-ACK and CSI described above through PUSCH and/or PUCCH.
  • FIG. 4 shows an SS/PBCH block for initial cell access in a 3GPP NR system.
  • the UE may acquire time and frequency synchronization with the cell and perform an initial cell search process.
  • the UE may detect the physical cell identity N cell ID of the cell in the cell search process.
  • the terminal may receive a synchronization signal, for example, a main synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station.
  • PSS main synchronization signal
  • SSS secondary synchronization signal
  • the terminal may obtain information such as a cell identifier (identity, ID).
  • the synchronization signal may be divided into PSS and SSS.
  • PSS may be used to obtain time domain synchronization and/or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization.
  • SSS may be used to obtain frame synchronization and cell group ID.
  • the PSS is transmitted through the 56th to 182th subcarriers in the first OFDM symbol and the SSS in the third OFDM symbol.
  • the lowest subcarrier index of the SS/PBCH block is numbered from 0.
  • the base station does not transmit a signal through the remaining subcarriers, that is, the 0 to 55 and 183 to 239 subcarriers.
  • the base station does not transmit a signal through the 48th to 55th and 183th to 191th subcarriers in the third OFDM symbol in which the SSS is transmitted.
  • the base station transmits a physical broadcast channel (PBCH) through the remaining REs except for the above signals in the SS/PBCH block.
  • PBCH physical broadcast channel
  • each physical layer cell ID is a part of only one physical-layer cell-identifier group.
  • the UE may identify one of three unique physical-layer identifiers by detecting the PSS.
  • the UE may identify one of 336 physical layer cell IDs associated with the physical-layer identifier by detecting the SSS.
  • the sequence d PSS (n) of the PSS is as follows.
  • sequence d SSS (n) of the SSS is as follows.
  • a radio frame with a length of 10 ms can be divided into two half frames with a length of 5 ms.
  • a slot in which an SS/PBCH block is transmitted in each half frame will be described with reference to FIG. 4B.
  • the slot in which the SS/PBCH block is transmitted may be any one of Cases A, B, C, D, and E.
  • the subcarrier interval is 15 kHz
  • the start time of the SS/PBCH block is ⁇ 2, 8 ⁇ + 14*nth symbol.
  • the subcarrier interval is 30 kHz, and the start time of the SS/PBCH block is ⁇ 4, 8, 16, 20 ⁇ + 28*nth symbol.
  • n 0 at a carrier frequency of 3 GHz or less.
  • the subcarrier interval is 120 kHz
  • the start time of the SS/PBCH block is ⁇ 4, 8, 16, 20 ⁇ + 28*nth symbol.
  • n 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 at a carrier frequency of 6 GHz or higher.
  • the subcarrier interval is 240 kHz
  • the start time of the SS/PBCH block is ⁇ 8, 12, 16, 20, 32, 36, 40, 44 ⁇ + 56*nth symbol.
  • n 0, 1, 2, 3, 5, 6, 7, 8 at a carrier frequency of 6 GHz or higher.
  • the base station may add a cyclic redundancy check (CRC) masked (eg, XOR operation) with a radio network temporary identifier (RNTI) to control information (eg, downlink control information, DCI).
  • CRC cyclic redundancy check
  • RNTI radio network temporary identifier
  • the base station may scramble the CRC with an RNTI value determined according to the purpose/target of each control information.
  • the common RNTI used by one or more terminals includes at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI).
  • SI-RNTI system information RNTI
  • P-RNTI paging RNTI
  • RA-RNTI random access RNTI
  • TPC-RNTI transmit power control RNTI
  • the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI.
  • the base station may perform rate-matching according to the amount of resource(s) used for PDCCH transmission after performing channel encoding (eg, polar coding) (S204) (S206).
  • channel encoding eg, polar coding
  • the base station may multiplex DCI(s) based on a control channel element (CCE)-based PDCCH structure (S208).
  • the base station may apply an additional process (S210) such as scrambling, modulation (eg, QPSK), interleaving, etc. to the multiplexed DCI(s), and then map the multiplexed DCI(s) to a resource to be transmitted.
  • a CCE is a basic resource unit for a PDCCH, and one CCE may consist of a plurality (eg, six) of a resource element group (REG). One REG may consist of a plurality (eg, 12) of REs.
  • the number of CCEs used for one PDCCH may be defined as an aggregation level.
  • FIG. 5B is a diagram related to CCE aggregation level and PDCCH multiplexing, and shows the type of CCE aggregation level used for one PDCCH and CCE(s) transmitted in the control region accordingly.
  • CORESET control resource set
  • PDCCH physical downlink control channel
  • CORESET is a time-frequency resource through which PDCCH, which is a control signal for a terminal, is transmitted.
  • a search space to be described later may be mapped to one CORESET.
  • the UE may decode the PDCCH mapped to the CORESET by monitoring the time-frequency domain designated as CORESET, rather than monitoring all frequency bands for PDCCH reception.
  • the base station may configure one or a plurality of CORESETs for each cell to the terminal.
  • CORESET may consist of up to 3 consecutive symbols on the time axis.
  • CORESET may be configured in units of 6 consecutive PRBs on the frequency axis.
  • CORESET#1 consists of continuous PRBs
  • CORESET#2 and CORESET#3 consist of discontinuous PRBs.
  • CORESET can be located in any symbol within the slot. For example, in the embodiment of Figure 5, CORESET#1 starts at the first symbol of the slot, CORESET#2 starts at the 5th symbol of the slot, and CORESET#9 starts at the 9th symbol of the slot.
  • FIG. 7 is a diagram illustrating a method of configuring a PDCCH search space in a 3GPP NR system.
  • the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) through which the PDCCH of the UE can be transmitted.
  • the search space may include a common search space that a 3GPP NR terminal must search in common and a terminal-specific or UE-specific search space that a specific terminal searches for.
  • the common search space it is possible to monitor the PDCCH configured to be commonly found by all terminals in the cell belonging to the same base station.
  • the UE-specific search space may be configured for each UE so that the PDCCH allocated to each UE can be monitored at different search space positions depending on the UE.
  • the search space between terminals may be allocated partially overlapping due to a limited control region to which the PDCCH can be allocated.
  • Monitoring the PDCCH includes blind decoding of PDCCH candidates in the search space.
  • a case in which blind decoding is successful may be expressed as that the PDCCH has been detected/received (successfully), and a case in which blind decoding has failed may be expressed as non-detection/non-receipt of the PDCCH, or it may be expressed as not successfully detected/received.
  • a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals is a group common (GC) PDCCH or common. It is referred to as PDCCH.
  • a PDCCH scrambled with a UE-specific RNTI that a specific UE already knows is referred to as a UE-specific PDCCH.
  • the common PDCCH may be included in the common search space, and the UE-specific PDCCH may be included in the common search space or the UE-specific PDCCH.
  • the base station receives information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH) that are transport channels through the PDCCH (ie, DL Grant) or resource allocation and HARQ of an uplink-shared channel (UL-SCH).
  • Information ie, UL grant) related to (hybrid automatic repeat request) may be informed to each UE or UE group.
  • the base station may transmit the PCH transport block and the DL-SCH transport block through the PDSCH.
  • the base station may transmit data excluding specific control information or specific service data through the PDSCH.
  • the UE may receive data excluding specific control information or specific service data through the PDSCH.
  • the base station may transmit information on which terminal (one or a plurality of terminals) the PDSCH data is transmitted to and how the corresponding terminal should receive and decode the PDSCH data by including it in the PDCCH.
  • DCI transmitted through a specific PDCCH is CRC masked with an RNTI of "A”
  • the DCI indicates that the PDSCH is allocated to a radio resource (eg, frequency location) of "B", "C
  • " indicates transmission format information (eg, transport block size, modulation scheme, coding information, etc.).
  • the UE monitors the PDCCH using its own RNTI information. In this case, if there is a terminal that blindly decodes the PDCCH using the "A" RNTI, the terminal receives the PDCCH, and receives the PDSCH indicated by "B” and "C” through the received PDCCH information.
  • Table 3 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.
  • PUCCH physical uplink control channel
  • the PUCCH may be used to transmit the following uplink control information (UCI).
  • UCI uplink control information
  • HARQ-ACK A response to a PDCCH (indicating DL SPS release) and/or a response to a downlink transport block (TB) on the PDSCH.
  • HARQ-ACK indicates whether information transmitted through the PDCCH or PDSCH is successfully received.
  • the HARQ-ACK response includes positive ACK (simply, ACK), negative ACK (hereinafter, NACK), DTX (Discontinuous Transmission), or NACK/DTX.
  • NACK negative ACK
  • DTX discontinuous Transmission
  • NACK/DTX NACK/DTX
  • HARQ-ACK is used interchangeably with HARQ-ACK/NACK and ACK/NACK.
  • ACK may be expressed as a bit value of 1
  • NACK may be expressed as a bit value of 0.
  • CSI Channel State Information: feedback information on the downlink channel.
  • the terminal is generated based on the CSI-RS (Reference Signal) transmitted by the base station.
  • Multiple Input Multiple Output (MIMO)-related feedback information includes a Rank Indicator (RI) and a Precoding Matrix Indicator (PMI).
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • CSI may be divided into CSI part 1 and CSI part 2 according to information indicated by the CSI.
  • five PUCCH formats may be used to support various service scenarios, various channel environments, and frame structures.
  • PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR.
  • PUCCH format 0 may be transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis.
  • the sequence may be a cyclic shift (CS) sequence from a base sequence used for PUCCH format 0.
  • a sequence obtained by cyclic shifting of a base sequence having a length of 12 based on a predetermined CS value m cs may be mapped to one OFDM symbol and 12 REs of one RB and transmitted.
  • M bit 1
  • 1-bit UCI 0 and 1 may be mapped to two cyclic shifted sequences having a difference of 6 cyclic shift values, respectively.
  • PUCCH format 1 may carry 1-bit or 2-bit HARQ-ACK information or SR.
  • PUCCH format 1 may be transmitted through consecutive OFDM symbols on the time axis and one PRB on the frequency axis.
  • the number of OFDM symbols occupied by PUCCH format 1 may be one of 4 to 14.
  • QPSK quadrature phase shift keying
  • a signal is obtained by multiplying a modulated complex valued symbol d(0) by a sequence of length 12.
  • the sequence may be a base sequence used for PUCCH format 0.
  • the UE spreads the obtained signal in an even-numbered OFDM symbol to which PUCCH format 1 is allocated as a time axis orthogonal cover code (OCC) and transmits it.
  • OCC time axis orthogonal cover code
  • PUCCH format 1 the maximum number of different terminals multiplexed to the same RB is determined according to the length of the OCC used.
  • a demodulation reference signal (DMRS) may be spread and mapped to odd-numbered OFDM symbols of PUCCH format 1 as OCC.
  • PUCCH format 2 may carry more than 2 bits of UCI.
  • PUCCH format 2 may be transmitted through one or two OFDM symbols on a time axis and one or a plurality of RBs on a frequency axis.
  • the same sequence may be transmitted on different RBs through the two OFDM symbols.
  • the sequence is a plurality of modulated complex symbols d(0), ... , d (M symbol -1).
  • M symbol may be M bit /2.
  • the UE may obtain a frequency diversity gain. More specifically, M bit bit UCI (M bit >2) is bit-level scrambled, QPSK modulated and mapped to RB(s) of one or two OFDM symbol(s).
  • the number of RBs may be one of 1 to 16.
  • PUCCH format 3 or PUCCH format 4 may carry more than 2 bits of UCI.
  • PUCCH format 3 or PUCCH format 4 may be transmitted through consecutive OFDM symbols on the time axis and one PRB on the frequency axis.
  • the number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be one of 4 to 14.
  • the terminal may generate the M-bit bit UCI (M bit> 2) a ⁇ / 2-BPSK (Binary Phase Shift Keying) or QPSK modulated to the complex-valued symbol d (0) ⁇ d (M symb -1) .
  • the UE may not apply block-unit spreading to PUCCH format 3. However, the UE uses a PreDFT-OCC of length-12 so that the PUCCH format 4 can have 2 or 4 multiplexing capacity in 1 RB (ie, 12 subcarriers) block-unit spreading. can be applied.
  • the UE may transmit the spread signal by transmitting precoding (or DFT-precoding) and mapping the spread signal to each RE.
  • the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length of UCI transmitted by the UE and the maximum code rate.
  • the UE may transmit HARQ-ACK information and CSI information together through PUCCH. If the number of RBs that the UE can transmit is greater than the maximum number of RBs available for PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE does not transmit some UCI information according to the priority of UCI information and does not transmit the remaining UCI Only information can be transmitted.
  • PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured through an RRC signal to indicate frequency hopping in a slot.
  • an index of an RB to be frequency hopping may be configured as an RRC signal.
  • PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured to be repeatedly transmitted in a plurality of slots.
  • the number K of slots in which the PUCCH is repeatedly transmitted may be configured by the RRC signal.
  • the repeatedly transmitted PUCCH should start from an OFDM symbol at the same position in each slot and have the same length. If any one OFDM symbol among the OFDM symbols of the slot in which the UE should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE may transmit the PUCCH by delaying it to the next slot without transmitting the PUCCH in the corresponding slot.
  • the UE may perform transmission/reception using a bandwidth that is less than or equal to the bandwidth of a carrier (or cell).
  • the terminal may be configured with a bandwidth part (BWP) composed of a continuous bandwidth of a part of the bandwidth of the carrier.
  • BWP bandwidth part
  • a UE operating according to TDD or operating in an unpaired spectrum may be configured with up to four DL/UL BWP pairs in one carrier (or cell). Also, the UE may activate one DL/UL BWP pair.
  • a terminal operating according to FDD or operating in a paired spectrum may be configured with up to four DL BWPs on a downlink carrier (or cell) and up to four UL BWPs on an uplink carrier (or cell). can be configured.
  • the UE may activate one DL BWP and one UL BWP for each carrier (or cell).
  • the UE may not receive or transmit in time-frequency resources other than the activated BWP.
  • the activated BWP may be referred to as an active BWP.
  • the base station may indicate the activated BWP among the BWPs configured by the terminal through downlink control information (DCI). BWP indicated through DCI is activated, and other configured BWP(s) are deactivated.
  • the base station may include a bandwidth part indicator (BPI) indicating the activated BWP in DCI scheduling PDSCH or PUSCH to change the DL/UL BWP pair of the terminal.
  • BPI bandwidth part indicator
  • the UE may receive a DCI for scheduling a PDSCH or a PUSCH and may identify an activated DL/UL BWP pair based on the BPI.
  • the base station may include the BPI indicating the activated BWP in the DCI scheduling the PDSCH to change the DL BWP of the terminal.
  • the base station may include the BPI indicating the activated BWP in the DCI scheduling the PUSCH in order to change the UL BWP of the terminal.
  • FIG. 8 is a conceptual diagram illustrating carrier aggregation.
  • the terminal uses a plurality of frequency blocks or (logical meaning) cells composed of uplink resources (or component carriers) and/or downlink resources (or component carriers). It means how to use it as one large logical frequency band.
  • One component carrier may also be referred to as a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell).
  • PCell primary cell
  • SCell secondary cell
  • PScell primary SCell
  • the entire system band may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz.
  • a component carrier may include one or more physically contiguous subcarriers. 8 shows that each component carrier has the same bandwidth, but this is only an example and each component carrier may have a different bandwidth.
  • each component carrier is illustrated as being adjacent to each other on the frequency axis, the figure is illustrated in a logical concept, and each component carrier may be physically adjacent to each other or may be separated from each other.
  • a different center frequency may be used in each component carrier. Also, one center frequency common to physically adjacent component carriers may be used. In the embodiment of FIG. 8 , assuming that all component carriers are physically adjacent, the center frequency A may be used in all component carriers. Also, assuming that each component carrier is not physically adjacent to each other, a center frequency A and a center frequency B may be used in each component carrier.
  • a frequency band used for communication with each terminal may be defined in units of component carriers.
  • Terminal A can use 100 MHz, which is the entire system band, and performs communication using all five component carriers.
  • Terminals B 1 to B 5 can use only 20 MHz bandwidth and perform communication using one component carrier.
  • Terminals C 1 and C 2 may use a 40 MHz bandwidth and perform communication using two component carriers, respectively. Two component carriers may or may not be logically/physically adjacent. In the embodiment of FIG. 8 , a case in which terminal C 1 uses two non-adjacent component carriers and terminal C 2 uses two adjacent component carriers is illustrated.
  • FIG. 9 is a diagram for explaining single-carrier communication and multi-carrier communication.
  • FIG. 9(a) shows a subframe structure of a single carrier
  • FIG. 9(b) shows a subframe structure of a multi-carrier.
  • a general wireless communication system may perform data transmission or reception through one DL band and one UL band corresponding thereto.
  • the wireless communication system may divide a radio frame into an uplink time unit and a downlink time unit in the time domain in the TDD mode, and transmit or receive data through the uplink/downlink time unit.
  • a bandwidth of 60 MHz may be supported by collecting three 20 MHz component carriers (CCs) in the UL and the DL, respectively.
  • CCs component carriers
  • Each of the CCs may be adjacent to or non-adjacent to each other in the frequency domain.
  • a DL/UL CC allocated/configured to a specific UE through RRC may be referred to as a serving DL/UL CC of a specific UE.
  • the base station may communicate with the terminal by activating some or all of the serving CCs of the terminal or by deactivating some CCs.
  • the base station may change activated/deactivated CCs and may change the number of activated/deactivated CCs. If the base station allocates the available CCs to the terminal in a cell-specific or terminal-specific manner, unless the CC allocation to the terminal is completely reconfigured or the terminal is handover, at least one of the CCs once allocated is not deactivated.
  • PCC primary CC
  • SCC secondary CC
  • SCell secondary cell
  • a cell is defined as a combination of downlink and uplink resources, that is, a combination of DL CC and UL CC.
  • a cell may be configured with a DL resource alone or a combination of a DL resource and a UL resource.
  • linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) may be indicated by system information.
  • the carrier frequency means the center frequency of each cell or CC.
  • a cell corresponding to the PCC is referred to as a PCell, and a cell corresponding to the SCC is referred to as an SCell.
  • a carrier corresponding to the PCell in the downlink is a DL PCC
  • a carrier corresponding to the PCell in the uplink is a UL PCC
  • a carrier corresponding to the SCell in the downlink is a DL SCC
  • a carrier corresponding to the SCell in the uplink is a UL SCC.
  • the serving cell(s) may be composed of one PCell and zero or more SCells. For a UE that is in the RRC_CONNECTED state but does not have carrier aggregation configured or does not support carrier aggregation, there is only one serving cell configured only with PCell.
  • the term "cell” used in carrier aggregation is distinguished from the term "cell” that refers to a certain geographic area in which a communication service is provided by one base station or one antenna group. That is, one component carrier may also be referred to as a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell).
  • a cell of carrier aggregation is referred to as a CC
  • a cell of the geographic area is referred to as a cell.
  • the control channel transmitted through the first CC may schedule the data channel transmitted through the first CC or the second CC using a carrier indicator field (CIF).
  • CIF is contained within DCI.
  • a scheduling cell is configured, and the DL grant/UL grant transmitted in the PDCCH region of the scheduling cell schedules the PDSCH/PUSCH of the scheduled cell. That is, a search region for a plurality of component carriers exists in the PDCCH region of the scheduling cell.
  • a PCell is basically a scheduling cell, and a specific SCell may be designated as a scheduling cell by a higher layer.
  • DL component carrier #0 is a DL PCC (or PCell)
  • DL component carrier #1 and DL component carrier #2 are assumed to be DL SCC (or SCell).
  • the DL PCC is set as the PDCCH monitoring CC. If cross-carrier scheduling is not configured by UE-specific (or UE-group-specific or cell-specific) higher layer signaling, CIF is disabled, and each DL CC has its own without CIF according to the NR PDCCH rule. Only the PDCCH scheduling the PDSCH can be transmitted (non-cross-carrier scheduling, self-carrier scheduling).
  • cross-carrier scheduling is configured by UE-specific (or UE-group-specific or cell-specific) higher layer signaling
  • CIF is enabled, and a specific CC (eg, DL PCC) uses CIF.
  • a specific CC eg, DL PCC
  • the PDCCH scheduling the PDSCH of DL CC A but also the PDCCH scheduling the PDSCH of another CC may be transmitted (cross-carrier scheduling).
  • the PDCCH is not transmitted in other DL CCs. Therefore, the terminal receives the self-carrier scheduled PDSCH by monitoring the PDCCH not including the CIF depending on whether cross-carrier scheduling is configured for the terminal, or receives the cross-carrier scheduled PDSCH by monitoring the PDCCH including the CIF. .
  • FIGS. 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system
  • the same or similar configuration may be applied to the 3GPP NR system.
  • the subframes of FIGS. 9 and 10 may be replaced with slots.
  • the Rel-16 NR system supports carrier aggregation of cells having different frame boundaries. For example, even if the frame start time of the first cell and the frame start time of the second cell are not the same, the first cell and the second cell may be merged and used.
  • the start time of the frame may be the first symbol in the first slot constituting the frame.
  • the base station configures cells for carrier aggregation to the terminal, it may consist of a primary cell (Pcell) and a secondary cell (Scell).
  • the base station may indicate the start time of the frame of the Scell by setting an offset between the start time of the Pcell frame and the start time of the Scell frame.
  • the base station may set an offset value, N offset, to the terminal.
  • N offset must satisfy the condition to be described later. In this specification, it may be described as N CA slot, offset.
  • the smallest SCS of each of Pcell and Scell may be 60KHz or 120KHz.
  • the start time of slot 0 of the frame of the cell having a lower frequency position is that of the cell having a higher frequency position.
  • q may have a value of 1 or -1. For example, if the frequency position of the subcarrier corresponding to point A of the Pcell is lower than the frequency position of the subcarrier corresponding to the point A of the Scell, q may be -1, and q may be 1 in other cases.
  • the smallest SCS of each of Pcell and Scell may not be 60KHz or 120KHz. If the smallest SCS of each Pcell and Scell is different, the start time of slot 0 of the frame of the cell with the lower SCS of the two cells shall be equal to the slot q*N offset mod N slotframe of the frame of the other cell. This is also the case when the smallest SCS of each Pcell and Scell is the same.
  • q may have a value of 1 or -1. If the lowest SCS of the PCell is less than or equal to the lowest SCS of the Scell, q may be -1, otherwise q may be 1.
  • the PCell In a dual connectivity (DC) environment, the PCell may be described as a PScell. Also, in this specification, slot n may mean an nth slot.
  • 11 and 12 are diagrams illustrating a method of determining an offset when the lowest subcarrier spacing of a Pcell and an Scell is different from each other according to an embodiment of the present invention.
  • the lowest SCS of the Pcell may be 15 KHz, and the lowest SCS of the Scell may be 30 KHz.
  • the largest of the lowest SCSs of the two cells is 30 KHz. Therefore, 30KHz is equal to 15kHz * 2 ⁇ offset , and ⁇ offset is 1.
  • q is -1. That is, the start time of slot 0 of the frame of the Pcell is the same as the start time of the slot -1*N offset mod N slotframe of the frame of the Scell.
  • the start time of slot 0 of the frame of the Pcell is the same as the start time of slot 2 of the frame of the Scell. Therefore, it can be confirmed that the terminal has received -2 as the N offset from the base station.
  • the lowest SCS of the PCell may be 30 KHz, and the lowest SCS of the Scell may be 15 KHz.
  • the largest of the lowest SCSs of the two cells is 30 KHz. Therefore, 30KHz is equal to 15kHz * 2 ⁇ offset , and ⁇ offset is 1.
  • q is 1. That is, the start time of slot 0 of the frame of the Pcell is the same as the start time of the slot 1*N offset mod N slotframe of the frame of the Scell.
  • the start time of slot 0 of the frame of the Pcell is the same as the start time of slot -2 of the frame of the Scell. Therefore, it can be confirmed that the terminal has received -2 as the N offset from the base station.
  • N offset, DL is N CA slot, offset, DL that is, It may be described as N CA slot, offset, PDCCH, N CA slot, offset, PDSCH.
  • N offset, UL is N CA slot, offset, UL, that is, It may be described as N CA slot, offset, PUCCH, N CA slot, offset, PUSCH.
  • Equation 1 When the start times of the frames of the first cell and the second cell coincide with each other, when the PDCCH scheduling the PDSCH is received in slot n of the first cell, the slot in which the PDSCH scheduled in the second cell is received is Equation 1 can be calculated using
  • the base station may set the offset of the first cell and the second cell to the terminal.
  • ⁇ offset, PDCCH and N offset, PDCCH are configured in the first cell in which the PDCCH scheduling PDSCH is received
  • ⁇ offset, PDSCH and N offset, PDSCH are configured in the second cell in which the scheduled PDSCH is received.
  • the slot in which the PDSCH scheduled in the second cell is received may be calculated using Equation (2).
  • Equations 1 and 2 the SCS of the first cell in which the PDCCH scheduling PDSCH is received is 15KHz * 2 ⁇ PDCCH , and the SCS of the second cell in which the scheduled PDSCH is received is 15KHz * 2 ⁇ PDSCH .
  • Equation 3 When the start times of the frames of the first cell and the second cell coincide with each other, when the PDCCH scheduling PUSCH is received in slot n of the first cell, the slot in which the PUSCH scheduled in the second cell is received is Equation 3 can be calculated using
  • the base station may set the offset of the first cell and the second cell to the terminal.
  • ⁇ offset, PDCCH and N offset, PDCCH are configured in the first cell in which the PDCCH scheduling PUSCH is received
  • ⁇ offset, PUSCH and N offset, PUSCH are configured in the second cell in which the scheduled PUSCH is received.
  • the slot in which the PUSCH scheduled in the second cell is received may be calculated using Equation (4).
  • Equations 3 and 4 the SCS of the first cell in which the PDCCH scheduling PUSCH is received is 15KHz * 2 ⁇ PDCCH , and the SCS of the second cell in which the scheduled PUSCH is received is 15KHz * 2 ⁇ PUSCH .
  • PDSCHs may be received in one or more cells, but for convenience of description, one cell (ie, the second cell) will be described.
  • the start time of each frame of the first cell and the second cell may coincide.
  • the type-1 HARQ-ACK codebook must include all HARQ-ACKs of PDSCH candidates that must be included in the PUCCH.
  • the slot in which the PDSCH is received may be calculated using Equation 5.
  • K 1,k is a value indicated through the PDCCH for scheduling the PDSCH, indicating the difference between the UL slot overlapping the last symbol in which the PDSCH is received and the slot in which the PUCCH including the HARQ-ACK of the PDSCH is transmitted.
  • K 1,k may be a non-negative integer.
  • n D indicates indexes of DL slots overlapping one UL slot. If the SCS of the first cell transmitting the PUCCH is greater than the SCS of the second cell in which the PDSCH is received , n D is 0, 1, ... , 2 ⁇ ( ⁇ UL - ⁇ DL )-1, otherwise n D may have a value of 0.
  • the SCS of the first cell transmitting the PUCCH is 15 kHz * 2 ⁇ UL
  • the SCS of the second cell receiving the PDSCH is 15 kHz * 2 ⁇ DL
  • HARQ-ACK of the PDSCH that is scheduled out of the slot is calculated using equation 5, it may be transmitted in slot n U, it shall include the type of the PUCCH -1 HARQ-ACK codebook transmitted on slot n U.
  • the start time of each frame of the first cell and the second cell may not coincide.
  • the PUCCH including the type-1 HARQ-ACK codebook may be transmitted in the slot n U of the first cell.
  • the Type-1 HARQ-ACK codebook must include all HARQ-ACKs of PDSCH candidates that must be included in the PUCCH.
  • the slot in which the PDSCH is received may be calculated using Equation (6).
  • ⁇ offset, UL , N offset, UL are the offsets of the first cell in which the PUCCH is transmitted, and ⁇ offset, DL and N offset, DL are It may be an offset of the second cell in which the PDSCH is received.
  • the PDSCH may be scheduled in one or more cells.
  • the offset in cell c may be described as ⁇ offset,DL,c and N offset,DL,c.
  • FIG. 13 is a diagram illustrating a method of generating a type-1 HARQ-ACK codebook when the start times of frames of the first cell and the second cell do not match according to an embodiment of the present invention.
  • the SCS of the first cell may be 15 KHz, and the SCS of the second cell may be 30 KHz. If the SCS of the DL Pcell and the UL Pcell is 30 KHz, the offset ⁇ offset,UL of the first cell may be 1, and N offset,UL may be 0. The offset ⁇ offset,DL of the second cell may be 1, and N offset,DL may be -2.
  • the PUCCH including the type-1 HARQ-ACK codebook is transmitted in slot 3 of the first cell and K 1,k is set to 2
  • the HARQ-ACK of the PDSCH to be included in the type-1 HARQ-ACK codebook is It may be HARQ-ACK of the PDSCH received in slots 4 and 5 of the second slot (refer to Equation 6).
  • Type-3 (Type-3) HARQ-ACK codebook was introduced.
  • the type-3 codebook may be described as a one-shot HARQ-ACK codebook.
  • the HARQ-ACK codebook described in this specification may be an arrangement of bits, that is, a bit sequence.
  • the base station may indicate to the terminal whether to use the type-3 HARQ-ACK codebook through higher layer signaling (eg, RRC signaling).
  • a parameter of higher layer signaling indicating whether to use the type-3 HARQ-ACK codebook may be described as 'pdsch-HARQ-ACK-OneShotFeedback-r16''.
  • the terminal When the terminal receives ' pdsch-HARQ-ACK-OneShotFeedback-r16 '' (when configured), the terminal multiplexes the HARQ-ACK bits (that is, bits indicating ACK/NACK) with the type-3 HARQ-ACK codebook and sends it to the base station. can be transmitted
  • type-3 HARQ-ACK for one cell
  • the index of one cell is c. If a plurality of cells are configured in one terminal, the terminal cascades the type-3 HARQ-ACK codebook for one cell according to the cell index to generate the type-3 HARQ-ACK codebook for all cells. have.
  • the value of may be set through higher layer signaling. At this time, may be set to one of 1 to 16.
  • a parameter of higher layer signaling that sets the value of may be described as 'nrofHARQ-ProcessesForPDSCH'.
  • the value of may be a preset value. For example, the preset value may be 8.
  • the maximum number of transmission TBs that the PDSCH scheduled for cell c may include may be 1 or 2.
  • the maximum number of TBs may be a value set through higher layer signaling.
  • a parameter of higher layer signaling that sets the maximum number of TBs may be described as 'maxNrofCodeWordsScheduledByDCI'.
  • the maximum number of TBs may be a preset value.
  • the preset value may be 1.
  • the terminal may receive additional spatial bundling configuration from the base station.
  • the UE may generate a 1-bit HARQ-ACK for two TBs included in one PDSCH.
  • the 1-bit HARQ-ACK may be ACK if the UE successfully receives two TBs, and may be NACK if any one of the two TBs is not successfully received.
  • the type-3 HARQ-ACK codebook may set (arrange) the HARQ-ACK bit according to the order of the HARQ process.
  • the terminal When HARQ processes are set, in ascending order of each HARQ process number (or HARQ process ID, hereinafter, the HARQ process number may be described in combination with the HARQ process ID) corresponding to each HARQ process number
  • the HARQ-ACK bit can be set.
  • the UE may recognize the HARQ process number of the PDSCH through the PDCCH (or DCI) for scheduling the PDSCH.
  • the UE may set the HARQ-ACK bit according to the HARQ process number when transmitting the HARQ-ACK bit indicating whether the reception of the PDSCH is successful to the base station in the type-3 HARQ-ACK codebook. For example, when the PDSCH is configured to include a maximum of one TB, the terminal may transmit a HARQ-ACK bit having a size of 1 bit corresponding to one HARQ process number to the base station. When the PDSCH is configured to include a maximum of two TBs, the terminal may transmit a 2-bit HARQ-ACK bit corresponding to one HARQ process number to the base station.
  • the UE may transmit an N-bit HARQ-ACK bit in one TB instead of a 1-bit HARQ-ACK bit.
  • N may be a value set through higher layer signaling.
  • the N-bit HARQ-ACK bit may be a HARQ-ACK bit indicating whether the UE has successfully received each of the N CBGs.
  • the type-3 HARQ-ACK codebook may include HARQ-ACK bits corresponding to all HARQ process numbers. That is, the type-3 HARQ-ACK codebook may also include a HARQ-ACK bit corresponding to a HARQ process number not received by the UE. In this case, the HARQ-ACK bit corresponding to the HARQ process number not received by the UE may indicate NACK.
  • the HARQ-ACK bit corresponding to the HARQ process number transmitted by the terminal to the base station before the current time may indicate NACK. This is to prevent the previously transmitted HARQ-ACK bit from being included again in the type-3 HARQ-ACK codebook.
  • the base station may additionally configure the terminal to include a new data indicator (NDI) corresponding to each HARQ process number in the type-3 HARQ-ACK codebook.
  • NDI may indicate whether new data exists.
  • the terminal when the terminal generates the type-3 HARQ-ACK codebook, it may include a HARQ-ACK bit indicating whether PDSCH reception is successful and an NDI value corresponding to the PDSCH.
  • the NDI value may be indicated through a PDCCH (or DCI) for scheduling the PDSCH. If the PDSCH is configured to include a maximum of 2 TBs, the UE may include the NDI value of each TB in the type-3 codebook.
  • the type-3 HARQ-ACK codebook may be represented by a pseudo-code as shown in Table 5.
  • HARQ-ACK codebook corresponding HARQ-ACK bits may be set (arranged) according to the HARQ process number. That is, in the Type-3 HARQ-ACK codebook, positions at which HARQ-ACK bits corresponding to each HARQ process number are set may be predetermined. However, in the semi-persistent scheduling (Semi-Persistent Scheduling, SPS) PDSCH release (release) DCI, the HARQ process number is not set. Therefore, in the Type-3 HARQ-ACK codebook, there is a need for a method of configuring (arranging) HARQ-ACK indicating whether the UE has successfully received the SPS PDSCH release DCI.
  • a method for transmitting the HARQ-ACK of the SPS PDSCH release DCI when the terminal receives the type-3 HARQ-ACK codebook from the base station will be described.
  • the UE may acquire the HARQ process number in a specific field of the SPS PDSCH release DCI.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI at a position where the HARQ-ACK bit corresponding to the HARQ process number obtained in a specific field of the SPS PDSCH release DCI is set and transmit it to the base station.
  • the specific field may be a HARQ process number field (or HARQ process ID field) or a Time Domain Resource Assignment (TDRA) field.
  • the UE may obtain the HARQ process number of the SPS PDSCH from the configuration of the SPS PDSCH released by the SPS PDSCH release DCI.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI at a position where the HARQ-ACK bit corresponding to the HARQ process number of the acquired SPS PDSCH is set and transmit it to the base station.
  • a method for the UE to obtain the HARQ process number of the SPS PDSCH from the configuration of the SPS PDSCH is as follows.
  • the UE may receive from the base station at least one of a transmission period of the SPS PDSCH, the number of available HARQ processes (nrofHARQ-Processes), and an offset of the HARQ process (HARQOffset).
  • the UE may receive an indication of a slot in which the SPS PDSCH is received from the DCI for activating the SPS PDSCH.
  • the UE may receive the SPS PDSCH every period from the slot. In this case, the UE may obtain the HARQ process number of the SPS PDSCH based on the index of the slot in which the SPS PDSCH is received.
  • the UE may obtain the HARQ process number of the SPS PDSCH using Equations 7 and 8.
  • Equation 7 may be used when the transmission period of the SPS PDSCH is in units of ms
  • Equation 8 may be used when the transmission period of the SPS PDSCH is in units of slots.
  • CURRENT_slot [(SFN ⁇ numberOfSlotsPerFrame ) + slot number in the frame], numberOfSlotsPerFrame is the number of consecutive slots in a frame, and SFN is a system frame number.
  • floor(x) represents the largest integer among integers not greater than x.
  • the SPS PDSCH may have two or more HARQ process numbers according to a received slot.
  • the UE must determine one of two or more HARQ process numbers for setting the HARQ-ACK bit of the SPS PDSCH release DCI.
  • 14 to 18 are diagrams illustrating a method of generating a type-3 HARQ-ACK codebook according to an embodiment of the present invention.
  • the SPS PDSCH described in this specification is an SPS PDSCH configured to be transmitted according to the transmission period of the SPS PDSCH, and may be an SPS PDSCH that the UE does not actually receive.
  • Method 2-1 There is a case where the number of HARQ processes available to the terminal is set to two or more (nrofHARQ-Processes>1), so that the terminal has two or more HARQ process numbers.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the Type-3 HARQ-ACK codebook using the lowest HARQ process number among them.
  • the lowest HARQ process number may be the same as an offset (HARQOffset) value of the HARQ process.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the Type-3 HARQ-ACK codebook by considering the HARQOffset value as the HARQ process number. Referring to FIG.
  • the period of the SPS PDSCH may be set to 2 slots, the number of available HARQ processes (nrofHARQ-Processes) may be set to 2, and the offset of the HARQ process (HARQOffset) may be set to 2.
  • the UE may receive the SPS PDSCH in slots 0 and 2.
  • the HARQ process number of the SPS PDSCH received by the UE in slot 0 is 2, and the HARQ process number of the SPS PDSCH received in slot 2 is 3.
  • the UE when the UE receives the SPS PDSCH release DCI for releasing the SPS PDSCH in slot 3, the UE sets the lowest HARQ process number 2 among HARQ process numbers 2 and 3 of the SPS PDSCH as the HARQ process number of the SPS PDSCH release DCI.
  • the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set in the type-3 HARQ-ACK codebook by using the lowest HARQ process number (ie, 2). In other words, when the HARQ process number is 2, the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI at a position where the corresponding HARQ-ACK bit is set.
  • the HARQ-ACK bit of the SPS PDSCH release DCI may be set in the Type-3 HARQ-ACK codebook using the highest HARQ process number among them.
  • the highest HARQ process number may be a value such as HARQOffset+nrofHARQ-Processes-1.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the Type-3 HARQ-ACK codebook by considering the HARQOffset+nrofHARQ-Processes-1 value as the HARQ process number.
  • the UE may determine the HARQ process number by using a reception slot of the SPS PDSCH configured to be received immediately before the SPS PDSCH release DCI.
  • the received SPS PDSCH may be one of SPS PDSCHs released by the SPS PDSCH release DCI.
  • the UE regards the index of the slot in which the SPS PDSCH set to be received immediately before the SPS PDSCH release DCI is received as the CURRENT_slot, and may determine the HARQ process number using Equations 7 and 8.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the type-3 codebook using the determined HARQ process number.
  • the transmission period of the SPS PDSCH may be set to 2 slots, the number of available HARQ processes (nrofHARQ-Processes) may be set to 2, and the offset of the HARQ process (HARQOffset) may be set to 2.
  • the UE may receive the SPS PDSCH in slots 0 and 2.
  • the HARQ process number of SPS PDSCH#0 received by the UE in slot 0 is 2, and the HARQ process number of SPS PDSCH#1 received in slot 2 is 3.
  • the terminal when the terminal receives the SPS PDSCH release DCI for releasing the SPS PDSCH in slot 3, the terminal sets the HARQ of the SPS PDSCH release DCI to 3, which is the HARQ process number of SPS PDSCH#1 set to be received immediately before the SPS PDSCH release DCI. You can think of it as a process number.
  • the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set in the Type-3 HARQ-ACK codebook using the considered HARQ process number (ie, 3).
  • the UE may determine the HARQ process number by using a slot of the SPS PDSCH configured to be received immediately after the SPS PDSCH release DCI.
  • the SPS PDSCH configured to be received immediately after the above may be one of the SPS PDSCHs released by the SPS PDSCH release DCI.
  • the SPS PDSCH set to be received immediately after the above may mean one of the SPS PDSCHs in which the UE expects the SPS PDSCH to be transmitted based on the transmission period of the SPS PDSCH.
  • the UE regards the index of the slot in which the SPS PDSCH set to be received immediately after the SPS PDSCH release DCI is received as the CURRENT_slot, and may determine the HARQ process number using Equations 7 and 8.
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the type-3 codebook using the determined HARQ process number.
  • the UE may determine the HARQ process number of the SPS PDSCH release DCI in the same way as the method of determining the HARQ process number of the SPS PDSCH. Specifically, the UE regards the index of the slot in which the SPS PDSCH release DCI is received as CURRENT_slot, and may determine the HARQ process number using Equations 7 and 8 above. The UE may set the HARQ-ACK bit of the SPS PDSCH release DCI in the Type-3 HARQ-ACK codebook using the determined HARQ process number. Referring to FIG.
  • the period of the SPS PDSCH may be set to 2 slots, the number of available HARQ processes (nrofHARQ-Processes) may be set to 2, and the offset of the HARQ process (HARQOffset) may be set to 2.
  • the UE may receive the SPS PDSCH in slots 0 and 2.
  • the HARQ process number of SPS PDSCH#0 received by the UE in slot 0 is 2, and the HARQ process number of SPS PDSCH#1 received in slot 2 is 3.
  • the UE may determine the HARQ process number of the SPS PDSCH release DCI as 3 using Equations 7 and 8.
  • the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set in the type-3 HARQ-ACK codebook by using the determined HARQ process number (ie, 3).
  • Method 2-4 When the terminal generates the type-3 codebook, it includes a New Data Indicator (NDI) value (bit) of 1-bit size indicating whether new data exists at least per HARQ process number and transmits it to the base station can
  • NDI New Data Indicator
  • the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI at the position where the NDI value is set and transmit it to the base station.
  • the base station must determine whether the bit set at the position where the NDI value transmitted from the terminal is set means the NDI value or the HARQ-ACK bit of the SPS PDSCH release DCI.
  • the NDI value of the SPS PDSCH should be 0 in the type-3 codebook transmitted by the UE.
  • the UE may always transmit ACK as HARQ-ACK. Therefore, when the UE transmits the HARQ-ACK bit of the SPS PDSCH release DCI, the NDI value of the SPS PDSCH may be 1 in the type-3 codebook.
  • the base station may determine that the SPS PDSCH release DCI has not been successfully received, and if the NDI value is 1, it is determined that the SPS PDSCH release DCI has been successfully received can do.
  • the period of the SPS PDSCH may be set to 2 slots, the number of available HARQ processes (nrofHARQ-Processes) may be set to 2, and the offset of the HARQ process (HARQOffset) may be set to 2.
  • the UE may receive the SPS PDSCH in slot 0 and slot 2.
  • the HARQ process number of SPS PDSCH#0 received by the UE in slot 0 is 2, and the HARQ process number of SPS PDSCH#1 received in slot 2 is 3.
  • the UE receives the SPS PDSCH release DCI for releasing the SPS PDSCH in slot 3 the UE receives the HARQ process number 3 of the SPS PDSCH#1 immediately before the SPS PDSCH release DCI in the Type-3 HARQ-ACK codebook.
  • the HARQ-ACK bit of the SPS PDSCH release DCI may be set at a position where the corresponding NDI value is set.
  • Method 2-5) When the PDSCH is configured to include 2TB, when the terminal generates a type-3 HARQ-ACK codebook, a HARQ- of 2-bit size indicating whether 2TB per HARQ process number has been successfully received It can be transmitted to the base station including the ACK bit.
  • the UE may set the HARQ-ACK of the SPS PDSCH release DCI at a position where the HARQ-ACK bit of the unreceived TB is set and transmit it to the base station.
  • the UE may assume that the SPS PDSCH released by the SPS PDSCH release DCI is always configured and transmitted in 1TB. Referring to FIG.
  • the PDSCH period may be set to 2 slots, the number of available HARQ processes (nrofHARQ-Processes) may be set to 2, and the HARQ process offset (HARQOffset) may be set to 2.
  • the UE may receive the SPS PDSCH in slot 0 and slot 2.
  • the HARQ process number of SPS PDSCH#0 received by the UE in slot 0 is 2, and the HARQ process number of SPS PDSCH#1 received in slot 2 is 3.
  • the terminal receives the SPS PDSCH release DCI for releasing the SPS PDSCH in slot 3, the terminal receives 3, which is the HARQ process number of the SPS PDSCH#1 received immediately before the SPS PDSCH release DCI in the type-3 HARQ-ACK codebook. It can be determined as a HARQ process number for HARQ-ACK of SPS PDSCH release DCI. That is, the UE may set the HARQ-ACK bit of the SPS PDSCH release DCI at a position where the HARQ-ACK of the second TB corresponding to HARQ process number 3 is set. For reference, here, the UE may set the HARQ-ACK bit of SPS PDSCH#1 at a position where the HARQ-ACK bit of the first TB corresponding to HARQ process number 3 is set.
  • One SPS PDSCH release DCI may release a plurality of SPS PDSCH configurations at once. This may be described as a joint release. In addition, the SPS PDSCH release DCI at this time may be described as a joint release DCI.
  • the SPS PDSCH configuration may include at least one of an ID of the SPS PDSCH, a transmission period of the SPS PDSCH, the number of available HARQ processes (nrofHARQ-Processes), an offset value of the HARQ process (HARQOffset), and a group ID.
  • the group ID groups a part of the plurality of SPS PDSCH configurations, respectively, and may mean an ID for each group.
  • the SPS PDSCH configuration included (set) in the same group ID may be jointly released.
  • the terminal receives the joint release DCI, the operation of the terminal will be described.
  • the UE may receive the joint release DCI and obtain a group ID from the HARQ process number field of the joint release DCI.
  • the UE may release SPS PDSCH configurations included in the acquired group ID.
  • the UE should include the HARQ-ACK bit indicating whether the joint release DCI has been successfully received in the type-3 HARQ-ACK codebook. To this end, the UE must determine the HARQ process number of the joint release DCI. Thereafter, the UE may set the HARQ-ACK bit of the joint release DCI in the type-3 HARQ_ACK codebook using the determined HARQ process number.
  • a method of determining the HARQ process number of the joint release DCI will be described.
  • Method 3-1) The UE determines the HARQ process number by using the SPS PDSCH configuration of the lowest ID among the SPS PDSCH configurations included in the same ID as the group ID obtained from the joint release DCI.
  • the HARQ process number may be determined using the above-described methods 1 to 2.
  • the UE may generate a type-3 HARQ-ACK codebook by considering the group ID obtained from the joint release DCI as a HARQ process number.
  • the UE may determine the HARQ process number by using one or more SPS PDSCHs corresponding to one or more SPS PDSCH configurations released by joint release DCI.
  • the HARQ process number may be determined using the above-described methods 1 to 2.
  • the terminal selects the slot of the SPS PDSCH received immediately before the joint release DCI among the plurality of SPS PDSCHs corresponding to the plurality of SPS PDSCH configurations released by the joint release DCI. can be used to determine the HARQ process number.
  • the terminal When reception of the CBG-based PDSCH is configured from the base station and the terminal receives the SPS PDSCH, the terminal should generate N bits per TB when generating the type-3 HARQ-ACK codebook.
  • N is the maximum number of CBGs that the PDSCH can include.
  • the 1-bit HARQ-ACK bit of the SPS PDSCH release DCI (or joint release DCI) must be converted to have an N-bit size.
  • a method of converting to have an N-bit size will be described.
  • the UE may generate an N-bit HARQ-ACK bit by repeating the 1-bit HARQ-ACK bit of the SPS PDSCH release DCI (or joint release DCI) N times. For example, when the UE successfully receives the SPS PDSCH release DCI, it may generate bits [11...1] of the size of N bits. Conversely, if the UE does not successfully receive the SPS PDSCH release DCI, bits [00...0] having a size of N bits may be generated.
  • An N-bit HARQ-ACK may be generated by combining the 1-bit HARQ-ACK bit of the SPS PDSCH release DCI (or joint release DCI) with the N-1 bit-sized NACK bit. For example, when the terminal successfully receives the SPS PDSCH release DCI, the terminal combines the N-1 bit size 0 after 1, which is a bit indicating the ACK indicating that the SPS PDSCH release DCI (or joint release DCI) has been successfully received. Thus, [10...0] of N-bit size can be generated.
  • the UE if the UE does not successfully receive the SPS PDSCH release DCI, the UE combines the N-1 bit size 0 after 0, which is a bit indicating NACK that the SPS PDSCH release DCI (or joint release DCI) has not been successfully received. [00...0] of N-bit size can be generated. That is, the first bit among the bits of the N-bit size may represent the HARQ-ACK bit indicating whether the SPS PDSCH release DCI has been successfully received.
  • the UE may not include the HARQ-ACK of the SPS PDSCH release DCI in the type-3 HARQ-ACK codebook. That is, upon receiving the SPS PDSCH release DCI, the UE may separately transmit the HARQ-ACK of the SPS PDSCH release DCI without being included in the type-3 HARQ-ACK codebook.
  • the HARQ-ACK transmitted separately may be included in a codebook of a type other than the type-3 HARQ-ACK codebook, or may be transmitted through the PUCCH. If a field indicating type-3 HARQ-ACK codebook transmission exists in the SPS PDSCH release DCI, the UE can expect that the field value is always 0.
  • the UE may determine it as an error case. Conversely, if the value of the field indicating type-3 HARQ-ACK codebook transmission is 0, the UE may determine that the SPS PDSCH release DCI has been successfully received.
  • the UE may transmit the HARQ-ACK of the SPS PDSCH release DCI by multiplexing it with the type-3 HARQ-ACK codebook without including the HARQ-ACK in the type-3 HARQ-ACK codebook.
  • the type-3 HARQ-ACK codebook and the HARQ-ACK of the SPS PDSCH release DCI may be transmitted on the same PUCCH.
  • the location of the HARQ-ACK of the SPS PDSCH included in the Type-3 HARQ-ACK codebook may be determined according to the HARQ process number. If a field indicating type-3 HARQ-ACK codebook transmission exists in the SPS PDSCH release DCI, the corresponding field value may be 0 or 1.
  • the UE may transmit only the HARQ-ACK of the SPS PDSCH release DCI to the PUCCH.
  • the UE may multiplex the type-3 HARQ-ACK codebook and the HARQ-ACK of the SPS PDSCH release DCI and transmit it to the PUCCH.
  • multiplexing means cascading the HARQ-ACK bit of the SPS PDSCH release DCI after the type-3 HARQ-ACK codebook. That is, the type-3 HARQ-ACK codebook is [b 0 , b 1 , ...
  • the UE may signal whether the UE has successfully received a downlink channel (signal) by transmitting a codebook including HARQ-ACK information.
  • the HARQ-ACK codebook may include one or more bits indicating whether the downlink channel has been successfully received.
  • the downlink channel may be a PDSCH or an SPS PDSCH or a PDCCH for releasing the SPS PDSCH.
  • the HARQ-ACK codebook may be divided into a semi-static HARQ-ACK codebook (Type-1 HARQ-ACK codebook) and a dynamic HARQ-ACK codebook (Type-2 HARQ-ACK codebook).
  • the base station may configure one of the two HARQ-ACK codebooks for the terminal, and the terminal may use the configured HARQ-ACK codebook.
  • the base station determines the number of bits of the HARQ-ACK codebook and each bit of the HARQ-ACK codebook through RRC signaling. You can set whether to indicate whether or not Therefore, the base station does not need to signal the information required for HARQ-ACK codebook transmission to the terminal whenever the HARQ-ACK codebook transmission is required.
  • the base station may signal information necessary for generating the HARQ-ACK codebook through the PDCCH scheduling the PDSCH. Specifically, the base station may signal information necessary for generating the HARQ-ACK codebook through a downlink assignment index (DAI) included in the DCI of the PDCCH.
  • the DAI may be information indicating the number of bits of the HARQ-ACK codebook and which channel each bit of the HARQ-ACK codebook has successfully received. DAI may be divided into counter-DAI and total-DAI. Total-DAI may indicate the number of channels in which reception success is indicated through the same HARQ-ACK codebook.
  • the counter-DAI may indicate a bit of the HARQ-ACK codebook for the channel indicating whether the reception is successful.
  • the DCI may include a value of total-DAI for the PDSCH scheduled by the DCI. That is, the UE may determine the number of bits of the dynamic HARQ-ACK codebook based on the DAI included in the DCI of the PDCCH.
  • the semi-static HARQ-ACK codebook may include HARQ-ACK of PDSCH scheduled by PDCCH, HARQ-ACK of SPS PDSCH, and HARQ-ACK of SPS PDSCH release DCI.
  • the size of the codebook (the number of bits) and the position in which the HARQ-ACK is configured in the codebook may be determined according to a value set by RRC. In this case, the position at which the HARQ-ACK is configured may be determined according to a symbol in which the PDSCH is received in the slot in which the PDSCH is received and/or the slot in which the PDSCH is received.
  • the HARQ-ACK bit of the SPS PDSCH release DCI is obtained using the position of the symbol in the slot in which the SPS PDSCH released by the DCI is received or the slot in which the SPS PDSCH is received. A set position may be determined.
  • the UE may use time resource allocation information of the PDSCH released by the SPS PDSCH release DCI. Specifically, by using the position of the symbol to be received in the slot or the slot in which the PDSCH released by the SPS PDSCH release DCI is to be received, the UE uses the SPS in the semi-static HARQ-ACK codebook (type-1 HARQ-ACK codebook). A position in which the HARQ-ACK bit of the PDSCH release DCI is set may be determined. That is, the HARQ-ACK bit of the SPS PDSCH release DCI may be set at a position where the HARQ-ACK bit of the SPS PDSCH is set.
  • the semi-static HARQ-ACK codebook type-1 HARQ-ACK codebook
  • 19 and 20 are diagrams illustrating a method for a UE to select an SPS PDSCH when subcarrier intervals of an uplink channel and a downlink channel are different.
  • SPS PDSCH release DCI may release a plurality of SPS PDSCH configurations.
  • a plurality of SPS PDSCH configurations may be configured in one cell, and a plurality of SPS PDSCH configurations may be activated.
  • One SPS PDSCH release DCI may release a plurality of SPS PDSCH configurations, and there may be SPS PDSCHs corresponding to each SPS PDSCH configuration.
  • the UE may receive a plurality of SPS PDSCHs corresponding to a plurality of SPS PDSCH configurations, and may select one SPS PDSCH from among the plurality of SPS PDSCHs to set the HARQ-ACK bit of the SPS PDSCH release DCI.
  • the SPS PDSCH selected by the UE may be an SPS PDSCH corresponding to the SPS PDSCH configuration having the lowest index (ID) among the plurality of SPS PDSCH configurations.
  • the index (ID) is a unique value of each SPS PDSCH configuration, and different values may be set for each of the plurality of SPS PDSCH configurations.
  • the SPS PDSCH release DCI releases one SPS PDSCH configuration
  • a specific situation is that the uplink subcarrier spacing (UL SCS) is smaller than the downlink subcarrier spacing (DL SCS), and the SPS PDSCH configuration is smaller than the ratio of the DL SCS and the UL SCS.
  • the UL SCS may be set to 15 KHz
  • the DL SCS to 60 KHz
  • the reception period of the SPS PDSCH may be set to 1 slot.
  • the K1 value for HARQ-ACK transmission of the SPS PDSCH (the difference between the slot in which the SPS PDSCH is received and the slot in which the HARQ-ACK of the SPS PDSCH is transmitted) may be set to 1. Therefore, when the PUCCH transmitted in UL slot n includes a type-1 HARQ-ACK codebook, the type-1 HARQ-ACK codebook is SPS PDSCH#0 of DL slot 4*n-4, 4*n-3 of HARQ-ACK information of SPS PDSCH#1, SPS PDSCH#2 of DL slot 4*n-2, and SPS PDSCH#3 of 4*n-1 should be included.
  • the UE may select one PDSCH from among PDSCH#0 to PDSCH#3.
  • the UE selects any one (ie, SPS PDSCH#2) from a plurality of SPS PDSCHs (ie, PDSCH#0 to PDSCH#3), and a slot in which the selected SPS PDSCH is received or selected within the slot.
  • HARQ-ACK of the SPS PDSCH release DCI may be transmitted based on the symbol in which the SPS PDSCH is received.
  • the UE may select the SPS PDSCH configured in the slot in which the SPS PDSCH release DCI is received. That is, the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the slot in which the SPS PDSCH release DCI is received. Alternatively, the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the slot in which the SPS PDSCH release DCI is received and the symbol in which the SPS PDSCH should be received in the slot.
  • the UE If the UE is configured to receive a plurality of SPS PDSCHs in a slot in which the SPS PDSCH release DCI is received, it must select one of the plurality of SPS PDSCHs.
  • the UE may select the first SPS PDSCH in the slot in which the SPS PDSCH release DCI is received. That is, the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the symbol in which the first SPS PDSCH is to be received in the slot in which the SPS PDSCH release DCI is received. Alternatively, the UE may select the last SPS PDSCH in the slot in which the SPS PDSCH release DCI is received.
  • the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the symbol in which the last SPS PDSCH is to be received in the slot in which the SPS PDSCH release DCI is received.
  • the UE may select the SPS PDSCH based on the reception time of the SPS PDSCH release DCI and the reception time of the SPS PDSCHs in the slot in which the SPS PDSCH release DCI is received.
  • the UE may select the SPS PDSCH to be received first after receiving the SPS PDSCH release DCI.
  • the SPS PDSCH may mean an SPS PDSCH configured based on an SPS PDSCH transmission period configured by RRC signaling from a base station.
  • the UE may determine a position in which the HARQ-ACK bit of the DCI is set based on a slot in which the last SPS PDSCH is configured among the SPS PDSCHs released by the SPS PDSCH release DCI. In this case, if there are a plurality of SPS PDSCHs in the slot in which the last SPS PDSCH is configured, the UE must select one SPS PDSCH from among the plurality of SPS PDSCHs. The UE may select the first SPS PDSCH in the slot in which the last SPS PDSCH is configured.
  • the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the symbol in which the first SPS PDSCH is to be received.
  • the UE may select the last SPS PDSCH in the slot in which the last SPS PDSCH is configured. That is, the UE may determine a position where the HARQ-ACK bit of the SPS PDSCH release DCI is set based on the symbol in which the last SPS PDSCH is to be received.
  • Method 5-3) The UE may select one SPS PDSCH configuration from among the SPS PDSCH configurations corresponding to the slot in which the SPS PDSCH release DCI is received. That is, rather than selecting the SPS PDSCH configuration having the lowest index (ID) among the SPS PDSCH configurations released by the SPS PDSCH release DCI, it is the most An SPS PDSCH configuration having a low index (ID) may be selected.
  • Method 5-3) can solve the problem that the SPS PDSCH release DCI for joint release must be received in the same slot as the slot in which the PDSCH of the SPS PDSCH configuration having the lowest index (ID) among the SPS PDSCH configurations is received. . After selecting one SPS PDSCH configuration from among the SPS PDSCH configurations, the UE may select one SPS PDSCH using the aforementioned methods 5-1) and 5-2).
  • the UE may select one SPS PDSCH regardless of the index (ID) of the SPS PDSCH configurations. That is, even if the SPS PDSCH release DCI releases the plurality of SPS PDSCH configurations, the UE may regard the plurality of SPS PDSCH configurations as one and the same SPS PDSCH configuration without distinguishing them. That is, even SPS PDSCHs configured by different SPS PDSCH configurations may be regarded as configured by the same SPS PDSCH configuration.
  • the UE may select one SPS PDSCH from among the SPS PDSCHs configured in the plurality of SPS PDSCH configurations by using the above-described methods 5-1) and 5-2).
  • the terminal may determine the HARQ-ACK bit sequence with an overhead of DCI smaller than the existing one. Accordingly, there is an effect of increasing the transmission efficiency between the base station and the terminal.
  • 21 is a block diagram showing the configurations of a terminal and a base station, respectively, according to an embodiment of the present invention.
  • the terminal may be implemented as various types of wireless communication devices or computing devices that ensure portability and mobility.
  • a terminal may be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), or the like.
  • the base station controls and manages cells (eg, macro cells, femto cells, pico cells, etc.) corresponding to the service area, and performs signal transmission, channel designation, channel monitoring, self-diagnosis, relay, etc. function can be performed.
  • the base station may be referred to as a next generation node (gNB) or an access point (AP).
  • gNB next generation node
  • AP access point
  • the terminal 100 may include a processor 110 , a communication module 120 , a memory 130 , a user interface unit 140 , and a display unit 150 . have.
  • the processor 110 may execute various commands or programs and process data inside the terminal 100 .
  • the processor 110 may control the entire operation including each unit of the terminal 100 , and may control data transmission/reception between the units.
  • the processor 110 may be configured to perform an operation according to the embodiment described in the present invention.
  • the processor 110 may receive the slot configuration information, determine the slot configuration based on the received slot configuration information, and perform communication according to the determined slot configuration.
  • the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN.
  • the communication module 120 may include a plurality of network interface cards (NIC) such as cellular communication interface cards 121 and 122 and unlicensed band communication interface card 123 in an internal or external form.
  • NIC network interface cards
  • each network interface card may be independently disposed according to a circuit configuration or use, unlike the drawing.
  • the cellular communication interface card 121 transmits and receives a wireless signal to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and based on a command from the processor 110, a cellular communication service using a first frequency band can provide
  • the cellular communication interface card 121 may include at least one NIC module using a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 121 independently communicates with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of a frequency band of less than 6 GHz supported by the corresponding NIC module. can be performed.
  • the cellular communication interface card 122 transmits and receives a wireless signal to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and based on a command of the processor 110, a cellular communication service using a second frequency band can provide
  • the cellular communication interface card 122 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of a frequency band of 6 GHz or higher supported by the NIC module. can be done
  • the unlicensed band communication interface card 123 transmits and receives wireless signals with at least one of the base station 200, an external device, and a server using a third frequency band that is an unlicensed band, and based on a command of the processor 110, the unlicensed band Provides communication services.
  • the unlicensed band communication interface card 123 may include at least one NIC module using the unlicensed band.
  • the unlicensed band may be a band of 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or 52.6 GHz or higher.
  • At least one NIC module of the unlicensed band communication interface card 123 is independently or subordinated to at least one of the base station 200, an external device, and a server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module. Wireless communication can be performed.
  • the memory 130 stores a control program used in the terminal 100 and various data corresponding thereto.
  • the control program may include a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200 , an external device, and a server.
  • the user interface 140 includes various types of input/output means provided in the terminal 100 . That is, the user interface 140 may receive a user input using various input means, and the processor 110 may control the terminal 100 based on the received user input. In addition, the user interface 140 may perform an output based on a command of the processor 110 using various output means.
  • the display unit 150 outputs various images on the display screen.
  • the display unit 150 may output various display objects such as content executed by the processor 110 or a user interface based on a control command of the processor 110 .
  • the base station 200 may include a processor 210 , a communication module 220 , and a memory 230 .
  • the processor 210 may execute various commands or programs and process data inside the base station 200 .
  • the processor 210 may control the overall operation including each unit of the base station 200 , and may control data transmission/reception between the units.
  • the processor 210 may be configured to perform an operation according to the embodiment described in the present invention.
  • the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.
  • the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN.
  • the communication module 220 may include a plurality of network interface cards such as the cellular communication interface cards 221 and 222 and the unlicensed band communication interface card 223 in an internal or external form.
  • each network interface card may be independently disposed according to a circuit configuration or use, unlike the drawing.
  • the cellular communication interface card 221 transmits/receives a wireless signal to and from at least one of the above-described terminal 100, an external device, and a server using a mobile communication network, and based on a command from the processor 210, cellular by the first frequency band Communication services can be provided.
  • the cellular communication interface card 221 may include at least one NIC module using a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 221 independently communicates with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of a frequency band of less than 6 GHz supported by the NIC module. can be performed.
  • the cellular communication interface card 222 transmits and receives a wireless signal to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and based on a command of the processor 210, a cellular communication service using a second frequency band can provide
  • the cellular communication interface card 222 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of a frequency band of 6 GHz or higher supported by the corresponding NIC module. can be done
  • the unlicensed band communication interface card 223 transmits and receives a wireless signal with at least one of the terminal 100, an external device, and a server using a third frequency band that is an unlicensed band, and based on a command of the processor 210, the unlicensed band Provides communication services.
  • the unlicensed band communication interface card 223 may include at least one NIC module using the unlicensed band.
  • the unlicensed band may be a band of 2.4 GHz, 5 GHz, 6 GHz, 7 GHz, or 52.6 GHz or higher.
  • At least one NIC module of the unlicensed band communication interface card 223 is independently or dependently connected to at least one of the terminal 100, an external device, and a server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module. Wireless communication can be performed.
  • the terminal 100 and the base station 200 shown in FIG. 21 are block diagrams according to an embodiment of the present invention. Separately indicated blocks are logically separated and illustrated for device elements. Accordingly, the elements of the above-described device may be mounted as one chip or a plurality of chips according to the design of the device. In addition, some components of the terminal 100 , for example, the user interface 140 and the display unit 150 may be selectively provided in the terminal 100 . In addition, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as necessary.
  • 22 is a flowchart illustrating a method of transmitting an ACK/NACK generated through a HARQ-ACK codebook performed by a terminal according to an embodiment of the present invention.
  • the terminal receives the first configuration information, which is configuration information of one or more semi-persistent scheduling (SPS) physical downlink shared channels (PDSCH) from the base station (S2210).
  • SPS semi-persistent scheduling
  • PDSCH physical downlink shared channels
  • the terminal receives downlink control information (DCI) for releasing the one or more SPS PDSCHs from the base station (S2220).
  • DCI downlink control information
  • the UE generates a HARQ-ACK codebook including an ACK/NACK bit indicating whether the DCI has been successfully received (S2230).
  • the terminal transmits the HARQ-ACK codebook to the base station (S2240).
  • the DCI may be a DCI for releasing any one of the one or more SPS PDSCHs received based on the first configuration information.
  • the HARQ-ACK codebook may be generated including a position where an ACK/NACK bit indicating whether or not reception of the one or more SPS PDSCHs determined according to each of one or more HARQ process IDs is successful is set.
  • the ACK/NACK bit indicating whether the DCI has been successfully received may be set at a position of the HARQ-ACK codebook determined according to a first HARQ process ID among the one or more HARQ process IDs indicated by the DCI.
  • the first configuration information may include a second HARQ process ID for any one of the one or more SPS PDSCHs.
  • the ACK/NACK bit indicating whether the DCI is successfully received may be set at a position of the HARQ-ACK codebook determined according to the second HARQ process ID.
  • the second HARQ process ID may be determined based on an index of a slot in which any one of the one or more SPS PDSCHs is received.
  • the first configuration information may include at least one of the number of available HARQ processes, a configuration period of the one or more SPS PDSCHs, and an HARQ process offset.
  • each of the available HARQ processes may correspond to the one or more HARQ process IDs, and the one or more HARQ process IDs may be determined based on the HARQ process offset.
  • the ACK/NACK bit indicating whether the DCI reception is successful is the lowest HARQ process ID or the highest HARQ process ID among a plurality of HARQ process IDs for the one or more SPS PDSCHs. It may be set at a location of the HARQ-ACK codebook determined according to the
  • the ACK/NACK bit indicating whether the DCI is successfully received is determined based on the index of the last slot among slots configured to be received before the slot in which the DCI is received, or , may be set in the position of the HARQ-ACK codebook determined according to the HARQ process ID determined based on the index of the first slot among the slots configured to be received after the slot in which the DCI is received.
  • the slots may be slots configured to receive the one or more SPS PDSCHs.
  • the ACK/NACK bit indicating whether the DCI has been successfully received may be set in a position of the HARQ-ACK codebook determined according to a HARQ process ID determined based on an index of a slot in which the DCI is received.
  • the HARQ-ACK codebook may be generated by additionally including New Data Indicator (NDI) values for the one or more SPS PDSCHs.
  • NDI New Data Indicator
  • the ACK/NACK bit indicating whether the DCI has been successfully received may be set at a position where the NDI value is set.
  • the ACK/NACK bit indicating whether the DCI is successfully received may be set at a position where the NDI value for the last SPS PDSCH among the one or more SPS PDSCHs configured to be received before the slot in which the DCI is received is set. .
  • the HARQ-ACK codebook includes an ACK/NACK bit for the first TB and the second It may be generated by additionally including an ACK/NACK bit for the TB.
  • each of the one or more SPS PDSCHs may include only the first TB.
  • the ACK/NACK bit indicating whether the DCI is successfully received may be set at a position where the ACK/NACK bit for the second TB is set.
  • the ACK/NACK bit indicating whether the DCI is successfully received is the HARQ-ACK codebook determined according to the HARQ process ID configured in the last slot among the slots configured to be received before the slot in which the DCI is received. can be set in the position of In this case, the slots may be slots configured to receive the one or more SPS PDSCHs.
  • the terminal may receive, from the base station, second configuration information for a second SPS PDSCH group including a part of the plurality of SPS PDSCHs.
  • the first configuration information is configuration information for the first SPS PDSCH group including the remainder except for the second SPS PDSCH group among the plurality of SPS PDSCHs, and the first configuration information is, the first SPS PDSCH group ID information may be included.
  • the second configuration information may include information on the second SPS PDSCH group ID, and the DCI may include information indicating the first SPS PDSCH group ID or the second SPS PDSCH group ID.
  • the DCI is for release of one or more SPS PDSCHs included in the first SPS PDSCH group or the second SPS PDSCH group, and the ACK/NACK bit indicating whether the DCI is successfully received is the DCI indicated
  • the first SPS PDSCH group ID or the second SPS PDSCH group ID may be set at a location of the HARQ-ACK codebook configured according to a HARQ process ID.
  • the PDSCH may be composed of N code block groups (CBGs).
  • CBGs code block groups
  • the ACK/NACK bit indicating whether the DCI is successfully received may be a bit having a size of N bits.
  • N is an integer.
  • the terminal may receive the one or more SPS PDSCHs based on a configuration period of the one or more SPS PDSCHs.
  • the HARQ-ACK codebook may be generated including a position where an ACK/NACK bit indicating whether reception is successful is set based on time domain resource assignment of the one or more SPS PDSCHs.
  • ACK/NACK indicating whether the DCI is successfully received
  • the bit may be set at a position where an ACK/NACK bit indicating whether reception succeeds or not is set based on time domain resource allocation of any one SPS PDSCH among a plurality of SPS PDSCHs set in the slots of the downlink channel.
  • the plurality of SPS PDSCHs may be a part of the one or more SPS PDSCHs, and in the plurality of SPS PDSCHs, slots of the downlink channel may be slots corresponding to slot intervals of the uplink channel.
  • the ACK/NACK bit indicating whether the reception of the DCI is successful or not is the time domain resource allocation of the first SPS PDSCH among the plurality of SPS PDSCHs or the time domain resource allocation of the last SPS PDSCH of the plurality of SPS PDSCHs.
  • An ACK/NACK bit indicating whether reception is successful may be set based on .
  • the HARQ-ACK codebook may be a Type-3 codebook or a semi-static codebook (eg, a Type-1 codebook).
  • the terminal that transmits the HARQ/ACK bit described with reference to FIG. 22 may be the terminal described with reference to FIG. 21 .
  • the terminal performing the methods described in this specification may be the terminal described in FIG. 21 .
  • the terminal may be configured to include a communication module for transmitting and receiving wireless signals, and a processor for controlling the communication module. In this case, the method of transmitting the HARQ/ACK bit described with reference to FIG. 22 through the processor may be performed.
  • the base station may be the base station described with reference to FIG. 22 .
  • the base station may also include a communication module for transmitting and receiving radio signals, and a processor for controlling the communication module.

Landscapes

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

Abstract

La présente invention concerne un procédé destiné à un terminal pour transmettre un ACK/NACK dans un système de communication sans fil qui comprend les étapes consistant : à recevoir, en provenance d'une station de base, des premières informations de configuration qui sont des informations de configuration concernant une ou plusieurs programmations semi-persistantes (SPS) de canaux partagés de liaison descendante physiques (PDSCH) ; à recevoir, en provenance de la station de base, des informations de commande de liaison descendante (DCI) destinées à libérer le ou les SPS PDSCH ; à générer un livre de codes HARQ-ACK comprenant un bit ACK/NACK indiquant si les DCI ont été reçues avec succès ; et à transmettre le livre de codes HARQ-ACK à la station de base.
PCT/KR2021/003188 2020-03-14 2021-03-15 Procédé destiné à transmettre un ack/nack basé sur le livre de codes harq-ack dans un système de communication sans fil et son dispositif WO2021187845A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20200031649 2020-03-14
KR10-2020-0031649 2020-03-14
KR10-2020-0042572 2020-04-08
KR20200042572 2020-04-08
KR20200099535 2020-08-08
KR10-2020-0099535 2020-08-08

Publications (1)

Publication Number Publication Date
WO2021187845A1 true WO2021187845A1 (fr) 2021-09-23

Family

ID=77771373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2021/003188 WO2021187845A1 (fr) 2020-03-14 2021-03-15 Procédé destiné à transmettre un ack/nack basé sur le livre de codes harq-ack dans un système de communication sans fil et son dispositif

Country Status (1)

Country Link
WO (1) WO2021187845A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023128684A1 (fr) * 2021-12-30 2023-07-06 삼성전자 주식회사 Procédé et dispositif pour déterminer un nombre d'id de processus harq et transmettre un harq-ack dans un système de communication sans fil
WO2023132535A1 (fr) * 2022-01-07 2023-07-13 엘지전자 주식회사 Procédé et appareil de transmission et de réception d'information de commande dans un système de communication sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160483A1 (fr) * 2018-02-15 2019-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Traitement de libération sps pour livre de codes harq-ack dynamique basé sur un groupe de blocs de code
WO2019192299A1 (fr) * 2018-04-04 2019-10-10 电信科学技术研究院有限公司 Procédé de transmission de harq-ack, terminal et station de base
CN110536435A (zh) * 2019-02-15 2019-12-03 中兴通讯股份有限公司 一种传输信息的方法和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160483A1 (fr) * 2018-02-15 2019-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Traitement de libération sps pour livre de codes harq-ack dynamique basé sur un groupe de blocs de code
WO2019192299A1 (fr) * 2018-04-04 2019-10-10 电信科学技术研究院有限公司 Procédé de transmission de harq-ack, terminal et station de base
CN110536435A (zh) * 2019-02-15 2019-12-03 中兴通讯股份有限公司 一种传输信息的方法和装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for control (Release 16)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 38.213, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. V16.0.0, 14 January 2020 (2020-01-14), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, pages 1 - 146, XP051860806 *
SAMSUNG: "Corrections on shared spectrum channel access", 3GPP DRAFT; R1-2001456, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20200224 - 20200306, 10 March 2020 (2020-03-10), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051863837 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023128684A1 (fr) * 2021-12-30 2023-07-06 삼성전자 주식회사 Procédé et dispositif pour déterminer un nombre d'id de processus harq et transmettre un harq-ack dans un système de communication sans fil
WO2023132535A1 (fr) * 2022-01-07 2023-07-13 엘지전자 주식회사 Procédé et appareil de transmission et de réception d'information de commande dans un système de communication sans fil

Similar Documents

Publication Publication Date Title
WO2019160387A1 (fr) Procédé de transmission d'informations de commande de liaison montante dans un système de communication sans fil et appareil d'utilisation associé
WO2020145704A1 (fr) Procédé et dispositif d'émission de canal de commande de liaison montante dans un système de communication sans fil
WO2019139446A1 (fr) Procédé de multiplexage de canal et procédé de transmission de canal multiplexé pour un dispositif et un système de communication sans fil mettant en œuvre lesdits procédés
WO2019216729A1 (fr) Procédé de multiplexage d'informations de commande de liaison montante dans un système de communication sans fil et appareil utilisant ledit procédé
WO2020145769A1 (fr) Procédé de transmission de canal partagé de liaison montante dans un système de communication sans fil et dispositif faisant appel à celui-ci
WO2020096438A1 (fr) Procédé de génération d'un livre de codes harq-ack dans un système de communication sans fil, et dispositif associé
WO2019031954A1 (fr) Procédé, dispositif et système de transmission ou de réception d'un canal de commande de liaison montante dans un système de communication sans fil
WO2019160364A1 (fr) Procédé et appareil d'émission et de réception de signal sans fil dans un système de communication sans fil
WO2019050371A1 (fr) Procédé de transmission et procédé de réception de données pour système de communication sans fil et appareil utilisant les procédés
WO2018143756A1 (fr) Procédé, dispositif et système pour émettre et recevoir un signal de référence et un canal de données dans un système de communication sans fil
WO2013006006A2 (fr) Procédé et appareil de transmission d'un signal dans un système de communication sans fil
WO2012144801A2 (fr) Dispositif et procédé de transmission de signal dans un système de communication sans fil
WO2017018759A1 (fr) Procédé de réception de signal de liaison descendante, équipement d'utilisateur, procédé d'émission de signal de liaison descendante et station de base
WO2017018758A1 (fr) Procédé de réception d'informations de commande en liaison descendante et équipement d'utilisateur et procédé de transmission d'informations de commande en liaison descendante et station de base
WO2016099196A1 (fr) Procédé destiné à l'attribution de ressources de transmission dans un système de communication sans fil prenant en charge une communication de dispositif à dispositif (d2d)
WO2016163802A1 (fr) Procédé d'exécution de cca dans un système d'accès sans fil supportant une bande sans licence, et appareil le supportant
WO2016182274A1 (fr) Procédé et dispositif de transmission/réception de données à l'aide d'une taille de bloc de transport définie pour un terminal de communication de type machine dans un système d'accès sans fil qui prend en charge une communication de type machine
WO2010123331A2 (fr) Procédé et appareil pour transmettre et recevoir un signal de commande pour fusionner des porteuses lors d'une transmission
WO2011084020A2 (fr) Procédé et appareil permettant de transmettre des informations de commande de liaison montante dans un système de communication sans fil pour supporter de multiples porteuses
WO2012015214A2 (fr) Procédé et dispositif pour transmettre des informations étendues de commande de liaison montante dans un système de communication sans fil
WO2020167080A1 (fr) Procédé et appareil permettant de transmettre et de recevoir un signal de référence de liaison montante dans un système de communication sans fil
WO2013112003A1 (fr) Procédé de transmission d'informations de commande et appareil correspondant
WO2020032783A1 (fr) Procédé, dispositif et système, d'accès à des canaux dans une bande sans licence
WO2021066449A1 (fr) Procédé et appareil de transmission et de réception répétées dans un système de communication sans fil
WO2021194301A1 (fr) Procédé de transmission de harq-ack, équipement utilisateur et support de stockage, et procédé de réception de harq-ack et station de base

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21770733

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21770733

Country of ref document: EP

Kind code of ref document: A1