WO2018164495A1 - Procédé et appareil d'émission et de réception d'un signal sans fil dans un système de communication sans fil - Google Patents

Procédé et appareil d'émission et de réception d'un signal sans fil dans un système de communication sans fil Download PDF

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Publication number
WO2018164495A1
WO2018164495A1 PCT/KR2018/002743 KR2018002743W WO2018164495A1 WO 2018164495 A1 WO2018164495 A1 WO 2018164495A1 KR 2018002743 W KR2018002743 W KR 2018002743W WO 2018164495 A1 WO2018164495 A1 WO 2018164495A1
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Prior art keywords
cbg
harq
ack
cbgs
bits
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PCT/KR2018/002743
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English (en)
Korean (ko)
Inventor
양석철
김기준
김선욱
박창환
안준기
박한준
황승계
Original Assignee
엘지전자 주식회사
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.)
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Publication date
Priority to CN202110510129.7A priority Critical patent/CN113411892B/zh
Priority to EP18764554.4A priority patent/EP3499771B1/fr
Priority to CN202210857257.3A priority patent/CN115361102B/zh
Priority to US16/065,739 priority patent/US11012221B2/en
Priority to JP2019501529A priority patent/JP6833971B2/ja
Priority to ES18764554T priority patent/ES2892448T3/es
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to BR112019000645-1A priority patent/BR112019000645B1/pt
Priority to AU2018232784A priority patent/AU2018232784B2/en
Priority to SG11201900089XA priority patent/SG11201900089XA/en
Priority to CA3052414A priority patent/CA3052414C/fr
Priority to EP22199036.9A priority patent/EP4135236B1/fr
Priority to CN202210851485.XA priority patent/CN115361100A/zh
Priority to RU2019100538A priority patent/RU2735328C1/ru
Priority claimed from KR1020180027207A external-priority patent/KR101943327B1/ko
Priority to EP22187551.1A priority patent/EP4102752A1/fr
Priority to CN202210851661.XA priority patent/CN115361101A/zh
Priority to MX2019000572A priority patent/MX2019000572A/es
Priority to EP19212163.0A priority patent/EP3633896B1/fr
Priority to CN201880016978.3A priority patent/CN110392995B/zh
Publication of WO2018164495A1 publication Critical patent/WO2018164495A1/fr
Priority to US16/262,373 priority patent/US10721046B2/en
Priority to PH12019501897A priority patent/PH12019501897A1/en
Priority to US15/930,694 priority patent/US11038655B2/en
Priority to US16/944,442 priority patent/US12058076B2/en
Priority to US17/003,449 priority patent/US11621821B2/en
Priority to US17/036,800 priority patent/US11012223B2/en
Priority to US17/235,319 priority patent/US11968147B2/en
Priority to US17/308,684 priority patent/US11271702B2/en
Priority to US17/967,432 priority patent/US11956173B2/en
Priority to US17/967,478 priority patent/US11956174B2/en
Priority to US18/444,118 priority patent/US20240195583A1/en

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    • 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
    • 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

Definitions

  • the present invention relates to a wireless communication system, and more particularly to a method and apparatus for transmitting and receiving wireless signals.
  • the wireless communication system includes a carrier aggregation (CA) -based wireless communication system.
  • CA carrier aggregation
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
  • 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
  • An object of the present invention is to provide a method and an apparatus therefor for efficiently performing a wireless signal transmission and reception process.
  • a method for transmitting control information by a terminal in a wireless communication system receiving information on the number M of code block groups defined for one transport block from a base station through a higher layer signal; ; Receiving a first transport block including a plurality of code blocks from the base station through a physical layer channel; And transmitting a HARQ-ACK payload including HARQ-ACK (Hybrid ARQ Acknowledgement) information about the first transport block to the base station, wherein each code block includes a code block-based cyclic redundancy check (CRC). Is added, and a transport block-based CRC is added to the first transport block, and the HARQ-ACK payload includes a plurality of HARQ-ACK bits corresponding to M code block groups for the first transport block.
  • CRC code block-based cyclic redundancy check
  • a terminal used in a wireless communication system comprising: a radio frequency (RF) module; And a processor, wherein the processor is configured to receive information about the number M of code block groups defined for one transport block from a base station through a higher layer signal, and to receive a first transport block including a plurality of code blocks.
  • RF radio frequency
  • HARQ-ACK Hybrid ARQ Acknowledgement
  • each code block includes a code block -Cyclic Redundancy Check (CRC) is added, a transport block-based CRC is added to the first transport block, and the HARQ-ACK payload is a plurality of M code block groups corresponding to the first transport block.
  • CRC Code block -Cyclic Redundancy Check
  • the upper layer signal may include a Radio Resource Control (RRC) signal
  • the physical layer channel may include a physical downlink shared channel (PDSCH).
  • RRC Radio Resource Control
  • PDSCH physical downlink shared channel
  • the size of the HARQ-ACK payload may remain the same based on M during the HARQ process for the first transport block.
  • the first transport block is composed of a plurality of code block groups
  • some of the plurality of code block groups include ceiling (K / M) code blocks, and the rest of the plurality of code block groups It includes flooring (K / M) code blocks
  • the ceiling is a rounding function
  • the flooring is a rounding function
  • K can represent the number of code blocks in the first transport block.
  • each HARQ-ACK bit in the HARQ-ACK payload is each HARQ-ACK information generated in code block group units for the first transport block. Can be represented.
  • HARQ-ACK bits for the first transport block in the HARQ-ACK payload have the same value, and the first Each HARQ-ACK bit for the transport block may represent HARQ-ACK information generated in transport block group units for the first transport block.
  • the first transport block in the HARQ-ACK payload Preferably, if the code block group-based CRC check results are all successful for the first transport block, but the transport block-based CRC check result is a failure, the first transport block in the HARQ-ACK payload.
  • the plurality of HARQ-ACK bits for may indicate NACK (Negative Acknowledgment).
  • a method for receiving control information by a base station in a wireless communication system comprising: transmitting information about the number M of code block groups defined for one transport block to a user equipment through a higher layer signal; step; Transmitting a first transport block including a plurality of code blocks to the terminal through a physical layer channel; And receiving a HARQ-ACK payload including HARQ-ACK (Hybrid ARQ Acknowledgement) information about the first transport block from the terminal, wherein each code block includes a code block-based cyclic redundancy check (CRC). Is added, and a transport block-based CRC is added to the first transport block, and the HARQ-ACK payload includes a plurality of HARQ-ACK bits corresponding to M code block groups for the first transport block.
  • CRC code block-based cyclic redundancy check
  • a base station used in a wireless communication system comprising: a radio frequency (RF) module; And a processor, wherein the processor transmits information about the number M of code block groups defined for one transport block to an MS through a higher layer signal, and transmits a first transport block including a plurality of code blocks.
  • RF radio frequency
  • a HARQ-ACK payload is transmitted to the UE through a physical layer channel, and includes a HARQ-ACK payload including HARQ-ACK (Hybrid ARQ Acknowledgement) information about the first transport block from the MS.
  • HARQ-ACK Hybrid ARQ Acknowledgement
  • CRC Cyclic Redundancy Check
  • FIG. 1 illustrates physical channels used in a 3GPP LTE (-A) system, which is an example of a wireless communication system, and a general signal transmission method using the same.
  • -A 3GPP LTE
  • FIG. 2 illustrates a structure of a radio frame.
  • FIG. 3 illustrates a resource grid of a downlink slot.
  • EDCCH Enhanced Physical Downlink Control Channel
  • FIG. 6 illustrates a structure of an uplink subframe used in LTE (-A).
  • FIG. 7 illustrates a Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme and an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • FIG 9 illustrates a transport block (TB) process.
  • CA 12 illustrates a Carrier Aggregation (CA) communication system.
  • 15 illustrates the structure of a self-contained subframe.
  • FIG. 18 illustrates a base station and a terminal that can be applied to 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 wireless technologies 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 in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced) is an evolved version of 3GPP LTE.
  • 3GPP LTE / LTE-A the technical spirit of the present invention is not limited thereto.
  • a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station.
  • the information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information transmitted and received.
  • FIG. 1 is a diagram for explaining physical channels used in a 3GPP LTE (-A) system and a general signal transmission method using the same.
  • the terminal which is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S101.
  • the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and provides information such as a cell identity. Acquire.
  • the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain broadcast information in a cell.
  • PBCH physical broadcast channel
  • the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • DL RS downlink reference signal
  • the UE After completing the initial cell discovery, the UE receives a physical downlink control channel (PDSCH) according to physical downlink control channel (PDCCH) and physical downlink control channel information in step S102 to be more specific.
  • PDSCH physical downlink control channel
  • PDCCH physical downlink control channel
  • System information can be obtained.
  • the terminal may perform a random access procedure such as steps S103 to S106 to complete the access to the base station.
  • the UE transmits a preamble through a physical random access channel (PRACH) (S103), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can be received (S104).
  • contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106). ) Can be performed.
  • the UE After performing the above-described procedure, the UE performs a general downlink control channel / physical downlink shared channel reception (S107) and a physical uplink shared channel (PUSCH) / as a general uplink / downlink signal transmission procedure.
  • Physical uplink control channel (PUCCH) transmission (S108) may be performed.
  • the control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI).
  • UCI includes Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), and the like.
  • HARQ ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK
  • SR Scheduling Request
  • CSI Channel State Information
  • the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indication
  • UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
  • the uplink / downlink data packet transmission is performed in subframe units, and the subframe is defined as a time interval including a plurality of symbols.
  • the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • a resource block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in the slot may vary depending on the configuration of a cyclic prefix (CP).
  • CP has an extended CP (normal CP) and a normal CP (normal CP).
  • normal CP when an OFDM symbol is configured by a normal CP, the number of OFDM symbols included in one slot may be seven.
  • extended CP since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
  • the number of OFDM symbols included in one slot may be six.
  • an extended CP may be used to further reduce intersymbol interference.
  • the subframe includes 14 OFDM symbols.
  • First up to three OFDM symbols of a subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • Type 2 (b) illustrates the structure of a type 2 radio frame.
  • Type 2 radio frames consist of two half frames.
  • the half frame includes 4 (5) normal subframes and 1 (0) special subframes.
  • the general subframe is used for uplink or downlink according to the UL-Downlink configuration.
  • the subframe consists of two slots.
  • Table 1 illustrates a subframe configuration in a radio frame according to the UL-DL configuration.
  • Uplink-downlink configuration Downlink-to-Uplink Switch point periodicity Subframe number 0 One 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U One 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D D D 6 5 ms D S U U U U D S U U D S U U D
  • D represents a downlink subframe
  • U represents an uplink subframe
  • S represents a special subframe.
  • the special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the structure of the radio frame is merely an example, and the number of subframes, the number of slots, and the number of symbols in the radio frame may be variously changed.
  • FIG. 3 illustrates a resource grid of a downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes 7 OFDM symbols and one resource block (RB) is illustrated as including 12 subcarriers in the frequency domain.
  • Each element on the resource grid is referred to as a resource element (RE).
  • One RB contains 12x7 REs.
  • the number NDL of RBs included in the downlink slot depends on the downlink transmission band.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 4 illustrates a structure of a downlink subframe.
  • up to three (4) OFDM symbols located in front of the first slot in a subframe correspond to a control region to which a control channel is allocated.
  • the remaining OFDM symbol corresponds to a data region to which a physical downlink shared chance (PDSCH) is allocated, and a basic resource unit of the data region is RB.
  • Examples of downlink control channels used in LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information on the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH is a response to uplink transmission and carries an HARQ ACK / NACK (acknowledgment / negative-acknowledgment) signal.
  • Control information transmitted on the PDCCH is referred to as downlink control information (DCI).
  • DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain group of terminals.
  • DCI downlink control information
  • the DCI format has formats 0, 3, 3A, 4 for uplink, formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, etc. defined for downlink.
  • the type of the information field, the number of information fields, the number of bits of each information field, etc. vary according to the DCI format.
  • the DCI format may include a hopping flag, an RB assignment, a modulation coding scheme (MCS), a redundancy version (RV), a new data indicator (NDI), a transmit power control (TPC), It optionally includes information such as a HARQ process number and a precoding matrix indicator (PMI) confirmation.
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • PMI precoding matrix indicator
  • any DCI format may be used for transmitting two or more kinds of control information.
  • DCI format 0 / 1A is used to carry DCI format 0 or DCI format 1, which are distinguished by a flag field.
  • the PDCCH includes a transmission format and resource allocation of a downlink shared channel (DL-SCH), resource allocation information for an uplink shared channel (UL-SCH), paging information for a paging channel (PCH), and system information on the DL-SCH. ), Resource allocation information of a higher-layer control message such as a random access response transmitted on a PDSCH, transmission power control commands for individual terminals in an arbitrary terminal group, activation of voice over IP (VoIP), and the like. .
  • a plurality of PDCCHs may be transmitted in the control region.
  • the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive CCEs (consecutive control channel elements).
  • the CCE is a logical allocation unit used to provide a PDCCH of a predetermined coding rate according to the state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of bits of the available PDCCH are determined according to the correlation between the number of CCEs and the code rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • the CRC is masked with a unique identifier (referred to as a radio network temporary identifier (RNTI)) depending on the owner of the PDCCH or the intended use.
  • RNTI radio network temporary identifier
  • a unique identifier (eg, C-RNTI (cell-RNTI)) of the terminal is masked on the CRC.
  • C-RNTI cell-RNTI
  • a paging indication identifier eg, p-RNTI (p-RNTI)
  • SIB system information block
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • the PDCCH carries a message known as Downlink Control Information (DCI), and the DCI includes resource allocation and other control information for one terminal or a group of terminals.
  • DCI Downlink Control Information
  • a plurality of PDCCHs may be transmitted in one subframe.
  • Each PDCCH is transmitted using one or more Control Channel Elements (CCEs), and each CCE corresponds to nine sets of four resource elements.
  • CCEs Control Channel Elements
  • the four resource elements are referred to as resource element groups (REGs).
  • Four QPSK symbols are mapped to one REG.
  • the resource element allocated to the reference signal is not included in the REG, so that the total number of REGs within a given OFDM symbol depends on the presence of a cell-specific reference signal.
  • REG is also used for other downlink control channels (PCFICH and PHICH). That is, REG is used as a basic resource unit of the control region.
  • PCFICH downlink control channels
  • PHICH PHICH
  • PDCCH format Numberof CCEs (n) Number of REGs Numberof PDCCH bits 0 One 9 72 One 2 8 144 2 4 36 288 3 5 72 576
  • a PDCCH with a format consisting of n CCEs can only start with a CCE having the same number as a multiple of n.
  • the number of CCEs used for transmission of a specific PDCCH is determined by the base station according to channel conditions. For example, if the PDCCH is for a terminal having a good downlink channel (eg, close to a base station), one CCE may be sufficient. However, in case of a terminal having a bad channel (eg, close to a cell boundary), eight CCEs may be used to obtain sufficient robustness.
  • the power level of the PDCCH may be adjusted according to channel conditions.
  • the approach introduced in LTE is to define a limited set of CCE locations where the PDCCH can be located for each terminal.
  • the limited set of CCE locations where the UE can find its own PDCCH may be referred to as a search space (SS).
  • the search space has a different size according to each PDCCH format.
  • UE-specific and common search spaces are defined separately.
  • the UE-Specific Search Space (USS) is set individually for each terminal, and the range of the Common Search Space (CSS) is known to all terminals.
  • UE-specific and common search spaces may overlap for a given terminal.
  • the base station may not find CCE resources for transmitting the PDCCH to all possible UEs.
  • the UE-specific hopping sequence is applied to the start position of the UE-specific search space in order to minimize the possibility of the above blocking leading to the next subframe.
  • Table 3 shows the sizes of common and UE-specific search spaces.
  • the terminal In order to keep the computational load according to the total number of blind decoding (BD) under control, the terminal is not required to simultaneously search all defined DCI formats.
  • the terminal In general, within a UE-specific search space, the terminal always searches for formats 0 and 1A. Formats 0 and 1A have the same size and are distinguished by flags in the message.
  • the terminal may be required to receive the additional format (eg, 1, 1B or 2 depending on the PDSCH transmission mode set by the base station).
  • the UE searches for formats 1A and 1C.
  • the terminal may be configured to search for format 3 or 3A.
  • Formats 3 and 3A have the same size as formats 0 and 1A and can be distinguished by scrambled CRCs with different (common) identifiers, rather than terminal-specific identifiers.
  • PDSCH transmission schemes according to transmission modes and information contents of DCI formats are listed below.
  • Transmission mode 1 Transmission from a single base station antenna port
  • Transmission mode 4 closed-loop spatial multiplexing
  • Transmission Mode 7 Single-antenna Port (Port 5) Transmission
  • ⁇ Transmission Mode 8 Double Layer Transmission (Ports 7 and 8) or Single-Antenna Port (Ports 7 or 8) Transmission
  • ⁇ Transfer Mode 9 Up to eight layer transfers (ports 7 to 14) or single-antenna ports (ports 7 or 8)
  • Format 1B Compact resource allocation for PDSCH (mode 6) using rank-1 closed-loop precoding
  • Format 1D compact resource allocation for PDSCH (mode 5) using multi-user MIMO
  • EPDCCH is a channel further introduced in LTE-A.
  • a control region (see FIG. 4) of a subframe may be allocated a PDCCH (Legacy PDCCH, L-PDCCH) according to the existing LTE.
  • the L-PDCCH region means a region to which an L-PDCCH can be allocated.
  • a PDCCH may be additionally allocated in a data region (eg, a resource region for PDSCH).
  • the PDCCH allocated to the data region is called an EPDCCH.
  • the EPDCCH carries a DCI.
  • the EPDCCH may carry downlink scheduling information and uplink scheduling information.
  • the terminal may receive an EPDCCH and receive data / control information through a PDSCH corresponding to the EPDCCH.
  • the terminal may receive the EPDCCH and transmit data / control information through a PUSCH corresponding to the EPDCCH.
  • the EPDCCH / PDSCH may be allocated from the first OFDM symbol of the subframe according to the cell type.
  • the PDCCH herein includes both L-PDCCH and EPDCCH.
  • FIG. 6 illustrates a structure of an uplink subframe used in LTE (-A).
  • the subframe 500 is composed of two 0.5 ms slots 501. Assuming the length of a Normal Cyclic Prefix (CP), each slot consists of seven symbols 502 and one symbol corresponds to one SC-FDMA symbol.
  • the resource block (RB) 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.
  • the structure of an uplink subframe of LTE (-A) is largely divided into a data region 504 and a control region 505.
  • the data area means a communication resource used in transmitting data such as voice and packet transmitted to each terminal, and includes a PUSCH (Physical Uplink Shared Channel).
  • PUSCH Physical Uplink Shared Channel
  • the control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a received ACK / NACK for an uplink signal, an uplink scheduling request, and a PUCCH (Physical Uplink). Control Channel).
  • the sounding reference signal (SRS) is transmitted through an SC-FDMA symbol located last on the time axis in one subframe. SRSs of multiple terminals transmitted in the last SC-FDMA of the same subframe can be distinguished according to frequency location / sequence.
  • the SRS is used to transmit an uplink channel state to a base station, and is periodically transmitted according to a subframe period / offset set by a higher layer (eg, an RRC layer), or aperiodically at the request of the base station.
  • the 3GPP system employs OFDMA in downlink and SC-FDMA in uplink.
  • both a terminal for uplink signal transmission and a base station for downlink signal transmission include a serial-to-parallel converter (401), a subcarrier mapper (403), and an M-point IDFT module (404). ) And the Cyclic Prefix (CP) addition module 406 are the same.
  • the terminal for transmitting a signal in the SC-FDMA scheme further includes an N-point DFT module 402.
  • the N-point DFT module 402 partially offsets the IDFT processing impact of the M-point IDFT module 404 so that the transmitted signal has a single carrier property.
  • the base station selects a terminal to transmit data for each transmission time interval (TTI) (eg, subframe).
  • TTI transmission time interval
  • the base station selects terminals to transmit data in uplink / downlink for each TTI and selects a frequency band used by the terminal for data transmission.
  • UEs transmit reference signals (or pilots) in uplink, and the base station determines the channel state of the UEs using the reference signals transmitted from the UEs in each unit frequency band for each TTI.
  • the base station informs the terminal of this result. That is, the base station transmits an uplink assignment message for transmitting data using a specific frequency band to an uplink scheduled terminal in a specific TTI.
  • the uplink assignment message is also referred to as a UL grant.
  • the terminal transmits data in the uplink according to the uplink assignment message.
  • the uplink allocation message may include a UE ID, RB allocation information, a Modulation and Coding Scheme (MCS), a Redundancy Version (RV) version, a New Data Indicator (NDI), and the like.
  • MCS Modulation and Coding Scheme
  • RV Redundancy Version
  • NDI New Data Indicator
  • the retransmission time is systematically promised (for example, 4 subframes after the NACK reception time) (synchronous HARQ). Therefore, the UL grant message transmitted from the base station to the terminal only needs to be transmitted during initial transmission, and subsequent retransmission is performed by an ACK / NACK signal (eg, PHICH signal).
  • an ACK / NACK signal eg, PHICH signal.
  • the base station since the retransmission time is not promised to each other, the base station should send a retransmission request message to the terminal.
  • the frequency resource or MCS for retransmission is the same as the previous transmission.
  • the frequency resource or MCS for the retransmission may be different from the previous transmission.
  • the retransmission request message may include a terminal ID, RB allocation information, HARQ process ID / number, RV, and NDI information.
  • the UL HARQ scheme uses synchronous non-adaptive HARQ.
  • the HARQ process number is given from 0 to 7.
  • One HARQ process operates per TTI (eg, subframe).
  • the base station 110 transmits a UL grant to the terminal 120 through the PDCCH (S600).
  • the terminal 120 transmits uplink data to the base station S110 using the RB and MCS designated by the UL grant after 4 subframes (eg, subframe 4) from the time point (eg, subframe 0) at which the UL grant is received. It transmits (S602).
  • the base station 110 generates ACK / NACK after decoding uplink data received from the terminal 120. If decoding on the uplink data fails, the base station 110 transmits a NACK to the terminal 120 (S604). The terminal 120 retransmits uplink data after 4 subframes from the time point of receiving the NACK (S606). Initial transmission and retransmission of uplink data is in charge of the same HARQ processor (eg, HARQ process 4). ACK / NACK information may be transmitted through PHICH.
  • the DL HARQ scheme in the LTE (-A) system uses asynchronous adaptive HARQ.
  • the base station 110 transmits a DL grant to the terminal 120 through the PDCCH.
  • the terminal 120 receives downlink data from the base station S110 by using the RB and MCS designated by the DL grant at a time point (eg, subframe 0) at which the DL grant is received.
  • the terminal 120 generates ACK / NACK after decoding downlink data. If decoding of the downlink data fails, the terminal 120 transmits a NACK to the base station 110 after 4 subframes (for example, subframe 4) from the time point of receiving the downlink data.
  • the base station 110 transmits a DL grant to the terminal 120 instructing retransmission of downlink data through the PDCCH at a desired time point (eg, subframe X).
  • the terminal 120 re-receives downlink data from the base station S110 using the RB and MCS designated by the DL grant at a time point (eg, subframe X) when the DL grant is received.
  • Each HARQ process is associated with a HARQ buffer of a medium access control (MAC) layer.
  • MAC medium access control
  • Each HARQ process manages state variables related to the number of transmissions of the MAC Physical Data Block (PDU) in the buffer, HARQ feedback for the MAC PDU in the buffer, the current redundancy version, and the like.
  • the HARQ process is responsible for reliable transmission of data (eg, transport blocks (TBs)).
  • a transport block may be divided into one or more code blocks (CBs) in consideration of the size of a channel encoder.
  • CBs code blocks
  • 9 illustrates a process of a transport block (TB). 9 may be applied to data of a DL-SCH, a PCH, and a multicast channel (MCH) transport channel.
  • the uplink TB (or data of the uplink transport channel) may be similarly processed.
  • the transmitter performs a CRC (eg 24-bit) (TB CRC) to check the TB for error. Thereafter, the transmitter may divide TB + CRC into a plurality of code blocks in consideration of the size of the channel encoder.
  • the maximum size of a code block in LTE (-A) is 6144-bits. Therefore, if the TB size is 6144-bit or less, no code block is configured. If the TB size is larger than 6144-bit, the TB is divided into 6144-bit units to form a plurality of code blocks.
  • Each code block is separately appended with a CRC (eg 24-bit) (CB CRC) for error checking.
  • CRC eg 24-bit
  • Each code block undergoes channel coding and rate matching, and then merges into one to form a codeword.
  • LTE LTE
  • data scheduling and a corresponding HARQ process are performed in TB units, and CB CRC is used to determine early termination of TB decoding.
  • the HARQ process is associated with soft buffers for transport blocks and soft buffers for code blocks in the PHY (Physical) layer.
  • N IR bit represents the soft buffer size for the transport block
  • N cb represents the soft buffer size for the r-th code block.
  • N cb is obtained as follows, and C represents the number of code blocks.
  • N IR is as follows.
  • N soft represents the total number of soft channel bits according to terminal capability.
  • K MIMO is 2 when the terminal is configured to receive PDSCH transmission based on transmission mode 3, 4, 8 or 9, and 1 otherwise.
  • M DL_HARQ is the maximum number of DL HARQ processes.
  • n SB is given by the following equation.
  • w k , C , N cb , K MIMO , and M limit are as defined above.
  • M DL_HARQ is the maximum number of DL HARQ processes.
  • the terminal prioritizes storage of soft channel bits corresponding to k of low values.
  • w k corresponds to the received soft channel bits.
  • range May include a subset that the received soft channel bits do not include.
  • Scheduling for UL transmission in LTE is possible only when the UL transmission timing of the terminal is synchronized.
  • the random access procedure is used for various purposes. For example, the random access procedure is performed at the initial network access, handover, and data generation.
  • the terminal may obtain a UL synchronization through a random access process. If UL synchronization is obtained, the base station may allocate resources for UL transmission to the corresponding terminal.
  • the random access process is divided into a contention based process and a non-contention based process.
  • a terminal receives information about a random access from a base station through system information. Thereafter, if the random access is required, the terminal transmits a random access preamble (also referred to as message 1) to the base station (S710). When the base station receives the random access preamble from the terminal, the base station transmits a random access response message (also referred to as message 2) to the terminal (S720).
  • the downlink scheduling information for the random access response message may be CRC masked with a random access-RNTI (RA-RNTI) and transmitted on an L1 / L2 control channel (PDCCH).
  • RA-RNTI random access-RNTI
  • PDCCH L1 / L2 control channel
  • the UE that receives the downlink scheduling signal masked by the RA-RNTI may receive and decode a random access response message from the PDSCH. Thereafter, the terminal checks whether there is random access response information indicated to the random access response message. Whether the random access response information indicated to the presence of the self may be determined by whether there is a random access preamble ID (RAID) for the preamble transmitted by the terminal.
  • the random access response information includes a timing advance (TA) indicating timing offset information for synchronization, radio resource allocation information used for uplink, and a temporary identifier (eg, T-CRNTI) for terminal identification.
  • TA timing advance
  • T-CRNTI temporary identifier
  • the terminal Upon receiving the random access response information, the terminal transmits an uplink message (also referred to as message 3) to an uplink shared channel (SCH) according to radio resource allocation information included in the response information (S730). After receiving the uplink message of step S730 from the terminal, the base station transmits a contention resolution (also called message 4) message to the terminal (S740).
  • an uplink message also referred to as message 3
  • SCH uplink shared channel
  • the base station After receiving the uplink message of step S730 from the terminal, the base station transmits a contention resolution (also called message 4) message to the terminal (S740).
  • the non-collision based random access procedure may exist when used in the handover procedure or requested by the command of the base station.
  • the basic process is the same as the competition based random access process.
  • the UE is allocated a random access preamble (ie, a dedicated random access preamble) for itself from the base station (S810).
  • Dedicated random access preamble indication information (eg, preamble index) may be included in the handover command message or received through the PDCCH.
  • the terminal transmits a dedicated random access preamble to the base station (S820). Thereafter, the terminal receives a random access response from the base station (S830) and the random access process ends.
  • DCI format 1A is used to initiate a non-collision based random access procedure with a PDCCH order.
  • DCI format 1A is also used for compact scheduling for one PDSCH codeword. The following information is transmitted using DCI format 1A.
  • the flag value 0 represents DCI format 0
  • the flag value 1 represents DCI format 1A.
  • DCI format 1A is used for a random access procedure by a PDCCH command.
  • VRB Virtual Resource Block
  • Resource block allocation information beat. All bits are set to one.
  • PRACH mask index 4 bits
  • DCI format 1A all remaining bits are set to zero for compact scheduling of PDSCH codewords.
  • CA 12 illustrates a Carrier Aggregation (CA) communication system.
  • a plurality of uplink / downlink component carriers may be collected to support a wider uplink / downlink bandwidth.
  • Each of the CCs may be adjacent or non-adjacent to each other in the frequency domain.
  • the bandwidth of each component carrier can be determined independently. It is also possible to merge asymmetric carriers in which the number of UL CCs and the number of DL CCs are different.
  • the control information may be set to be transmitted and received only through a specific CC. This particular CC may be referred to as the primary CC and the remaining CCs may be referred to as the secondary CC.
  • the PDCCH for downlink allocation may be transmitted in DL CC # 0, and the corresponding PDSCH may be transmitted in DL CC # 2.
  • component carrier may be replaced with other equivalent terms (eg, carrier, cell, etc.).
  • a carrier indicator field (CIF) is used.
  • Configuration for the presence or absence of CIF in the PDCCH may be semi-statically enabled by higher layer signaling (eg, RRC signaling) to be UE-specific (or UE group-specific).
  • RRC signaling e.g., RRC signaling
  • ⁇ CIF disabled The PDCCH on the DL CC allocates PDSCH resources on the same DL CC and PUSCH resources on a single linked UL CC.
  • a PDCCH on a DL CC may allocate a PDSCH or PUSCH resource on one DL / UL CC among a plurality of merged DL / UL CCs using the CIF.
  • the base station may allocate a monitoring DL CC (set) to reduce the BD complexity at the terminal side.
  • the UE may perform detection / decoding of the PDCCH only in the corresponding DL CC.
  • the base station may transmit the PDCCH only through the monitoring DL CC (set).
  • the monitoring DL CC set may be set in a terminal-specific, terminal-group-specific or cell-specific manner.
  • DL CC A is set to PDCCH CC.
  • DL CC A to C may be referred to as a serving CC, a serving carrier, a serving cell, and the like.
  • each DL CC can transmit only PDCCH scheduling its PDSCH without CIF according to the LTE PDCCH rule (non-cross-CC scheduling).
  • a specific CC eg, DL CC A
  • PDCCH is not transmitted in DL CC B / C.
  • the millimeter wave has a short wavelength of the signal, it is possible to install a plurality of antennas in the same area.
  • the wavelength is 1 cm, so a total of 100 antenna elements can be installed in a 5 by 5 cm panel in a two-dimensional array of 0.5 ⁇ (wavelength) spacing. Therefore, mmW systems attempt to use multiple antenna elements to increase the beamforming (BF) gain to increase coverage or to increase throughput.
  • BF beamforming
  • a TXRU transmitter unit
  • independent beamforming is possible for each frequency resource.
  • the analog beamforming method has a disadvantage in that only one beam direction can be made in the entire band and thus no frequency selective beam can be made.
  • a transmitter transmits a signal by changing a direction of a beam over time (transmission beamforming), and a receiver may receive a signal by changing a direction of a beam over time (receive beamforming).
  • transmission beamforming transmits a signal by changing a direction of a beam over time
  • receiver beamforming receives a signal by changing a direction of a beam over time (receive beamforming).
  • the transmit and receive beams change direction of the beam simultaneously with time
  • the transmit beam only changes direction of the receive beam with time
  • receive beam may change with time.
  • FIG. 15 illustrates the structure of a self-completed subframe.
  • hatched areas represent DL control areas
  • black areas represent UL control areas.
  • An area without an indication may be used for DL data transmission or may be used for UL data transmission. Since DL and UL transmissions are sequentially performed in one subframe, DL data may be transmitted in a subframe and UL ACK / NACK may be received. As a result, when data transmission error occurs, it takes less time to retransmit data, thereby minimizing the transmission latency of final data.
  • At least the following four subframe types may be considered. Each interval is listed in chronological order.
  • PDFICH, PHICH, PDCCH may be transmitted in the DL control period, and PDSCH may be transmitted in the DL data period.
  • PUCCH may be transmitted in the UL control period, and PUSCH may be transmitted in the UL data period.
  • the GP provides a time gap in the process of the base station and the terminal switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Some OFDM symbols at the time of switching from DL to UL in the subframe may be set to GP.
  • the bit stream (ie, TB) to be transmitted through the PDSCH is divided into a plurality of CBs, and channel coding and CRC for each CB. Is applied (see Fig. 9). If any one of the plurality of CBs included in one TB fails to receive (eg, decode), the terminal reports a HARQ-ACK feedback corresponding to the TB to the base station as a NACK. In this way, the base station retransmits all the CB corresponding to the TB.
  • the HARQ operation on the DL data in the legacy LTE (-A) is performed based on the TB scheduling / transmission from the base station and the HARQ-ACK feedback configuration of the TB unit from the terminal corresponding thereto.
  • next-generation RAT (hereinafter referred to as a new RAT) system may basically have a larger system (carrier) (BW) bandwidth than LTE, and thus (maximum) TBS is likely to be larger than that of existing LTE. Accordingly, the number of CBs constituting one TB may also be greater than in LTE. Therefore, if HARQ-ACK feedback in units of TB is performed in the new RAT system as before, even if a decoding error (that is, NACK) occurs for only a few CBs, retransmission scheduling in units of TB is involved, so resource use efficiency is improved. Can be degraded.
  • a decoding error that is, NACK
  • a small (symbol) of a portion of resources allocated for transmission of delay-insensitive data type 1 eg., enhanced Mobile BroadBand, eMBB
  • Delay-sensitive data type 2 eg, Ultra-Reliable Low Latency Communications, URLLC
  • TTI time interval
  • the decoding error i.e., NACK
  • NACK is concentrated only on a specific part of the plurality of CBs constituting one TB for data type 1 due to the influence of an interference signal having a time-selective characteristic. This may occur.
  • the present invention proposes a method of performing (retransmission) scheduling in units of CB or CBG and configuring / transmitting HARQ-ACK feedback in units of CB / CBG. Specifically, the present invention proposes a method of configuring a CBG, a method of configuring HARQ-ACK (hereinafter, A / N) feedback, a method of operating a reception soft buffer of a terminal, and a handling method for a specific mismatch situation. do.
  • TBS TB size. Total number of bits that make up the TB
  • CB size the total number of bits constituting the CB
  • CBG code block group. All CBs (which constitute a single TB) may be set to one CBG, some multiple CBs may be configured as one CBG, or one CB may be configured as one CBG.
  • a / N HARQ-ACK response. That is, it may mean ACK, NACK, and DTX. DTX indicates the case of missing the PDCCH.
  • the A / N bit may be set to 1 in the case of ACK and to 0 in the case of NACK. Can be used equivalent to HARQ-ACK, ACK / NACK.
  • an A / N for the CBG can be generated based on an error check result for the CB in the CBG. For example, when all the CBs in the CBG are successfully detected, the UE sets an A / N response (or A / N bit) to the ACK for the CBG, and when any one of the CBs in the CBG is not successfully detected. The UE may set an A / N response (or A / N bit) ACK to the CBG (logical AND).
  • the A / N payload for the CBG (s) of the TB includes a plurality of A / N (response) bits, and each A / N (response) bit corresponds one-to-one to the CBG of the TB.
  • CBG-based retransmission may be performed in units of CBG in response to CBG-based A / N. For example, when the base station retransmits a TB to the terminal, the base station may perform retransmission only for the CBG having received the NACK from the terminal. At this time, upon retransmission of the TB corresponding to the same HARQ process as the previous transmission of the TB, the CB (s) in the CBG remain the same as the initial transmission of the TB.
  • CBG size the number of CBs constituting the CBG
  • CBG index an index that distinguishes between CBGs.
  • a CBG index may be used equivalent to a CBG having that index.
  • Symbol Unless otherwise distinguished, this may mean an OFDMA symbol or an SC-FDMA symbol.
  • Method X-1 Given the number of bits Cn constituting one CB, based on the configuration, Cm CBs
  • Cn may mean the minimum number of bits constituting one CB
  • Cn may mean the maximum number of bits constituting one CB.
  • Cn may mean the minimum number of bits constituting one CB, and in the latter case, Cn may mean the maximum number of bits constituting one CB.
  • one or more specific CBs (hereinafter, small CBs) among the total Cm CBs may be configured with fewer bits than other CBs (hereinafter, regular CBs). Accordingly, a method of grouping Cm CBs having an uneven size into M plurality of CBGs may be needed. Specifically, the total CB number Cm may be divided into a case where the total CB number Cm is a multiple of the CBG number M and a case where the total CB number Cm is not. The following CB grouping scheme may be considered for each. In the following description, the CBG size may mean the number of CBs per CBG. On the other hand, when Cm is not a multiple of M, the size may be different for each CBG, and the size difference between CBGs may be limited to at most one CB.
  • Cm is a multiple of M (all CBGs have the same size)
  • Opt 1-2 configure small CBs to belong to as few CBGs as possible
  • Cm is not a multiple of M (size may vary by CBG)
  • -Opt 2-1 Configured to belong to a large CBG so that it becomes a small CB
  • Opt 2-3 Apply Opt 1-1 or Opt 1-2
  • CB indexes ⁇ 1, 2 ⁇ , ⁇ 3, 4 ⁇ , ⁇ 5, 6, 7 ⁇ are applied when Opt 2-1 is applied, and CB indexes ⁇ 1, 2, 3 ⁇ , ⁇ are applied when Opt 2-2 is applied.
  • 4, 5 ⁇ and ⁇ 6, 7 ⁇ may be configured as CBG index 1/2/3, respectively.
  • CB indexes ⁇ 1, 2, 5 ⁇ , ⁇ 3, 6 ⁇ , ⁇ 4, 7 ⁇ if Opt 1-1 is applied, CB indexes ⁇ 1, 2, 5 ⁇ , ⁇ 3, 6 ⁇ , ⁇ 4, 7 ⁇ .
  • CB indexes ⁇ 1, 2 ⁇ , ⁇ 3, 4 ⁇ , ⁇ 5, 6, 7 ⁇ may be configured as CBG index 1/2/3, respectively.
  • the size of the CBG having high retransmission probability can be reduced as much as possible by including the minimum number of CBs in the CBG corresponding to the portion where the decoding reliability may be low.
  • the CB size of the radio signal may be relatively small, the radio signal may be far from time in the DMRS, the radio signal may be far from the CSI feedback point, or the radio signal may be This may be the case when the SRS (or PUCCH or PRACH) is mapped to an adjacent (OFDMA / SC-FDMA) symbol.
  • CBG can be configured as follows.
  • the high index CBG may have a relatively small CBG size, and may have more small CBs even though the CBG sizes are the same.
  • Signals are sequentially mapped in a frequency-first (or time-first) manner from the CBG of the low CBG index.
  • the low index CBG may be mapped to a resource having a relatively high decoding reliability.
  • Method X-2 Given the total number of CBs Cm, and constructing each CB in units of Cn bits based on this
  • the total number of CBs Cm is predefined with the same single value irrespective of TBS or different values (e.g. proportional to TBS) per TBS, or semi-static signaling (e.g. RRC signaling) or dynamic signaling (e.g. It may be indicated to the terminal through DCI).
  • Cn may mean the minimum number of bits constituting one CB
  • Cn may mean the maximum number of bits constituting one CB.
  • mod (Ck, Cm) CBs have (Cn + 1) (or, ceiling (Ck / Cm) Bits) and the remaining (Cm-mod (Ck, Cm)) CBs may consist of Cn bits.
  • Cn CB consists of ceiling (Ck / Cm) bits, (Cm-mod (Ck, Cm)) CBs consist of (Cn-1) (or floor (Ck / Cm)) bits
  • the remaining mod (Ck, Cm) CBs may consist of Cn bits.
  • Cn may mean the minimum number of bits constituting one CB
  • Cn may mean the maximum number of bits constituting one CB.
  • Method X-3 Given the minimum number of bits Tm constituting one CB, and constructing the CB based on this
  • All CBs constituting one TB may be set to include at least Tm or more bits.
  • TBS as Ck
  • an operation of calculating Cm.max, which is the maximum Cm value that satisfies the relationship of Ck / Cm Tm, and splitting the TB into Cm.max CBs may be considered.
  • Method X-4 Scheduling in units of CBs and grouping between multiple CBs when the number of CBs is above a certain level
  • the CB or CBG (retransmission) scheduling may be set / defined to be applied.
  • a plurality of CBs may be grouped and configured to define one CBG (eg, Ts ⁇ Tg).
  • the number of bits Cn constituting one CB may be defined in advance or may be given through specific signaling (eg, RRC signaling, DCI).
  • Method A-1 The number of CBs constituting one CBG is given and based on this, M CBGs are configured.
  • the number of CBs constituting one CBG is previously defined with the same single value regardless of TBS or with different TBSs (e.g., proportional to TBS), semi-static signaling (e.g. RRC signaling) or dynamic
  • the terminal may be instructed through signaling (eg, DCI).
  • signaling e.g, DCI.
  • only one CBG may consist of (N + mod (K, N)) CBs, and the remaining (M-1) CBGs may each consist of N CBs.
  • N may mean the minimum number of CBs constituting one CBG
  • M may mean the maximum number of CBs constituting one CBG.
  • the terminal may configure and transmit A / N bits for each CBG.
  • a method of uniformly allocating the number of CBs per CBG to all CBGs may be applied.
  • M floor (K / N) CBGs
  • mod (K, N) CBGs consist of (N + 1) CBs
  • the remaining CBGs consist of N CBs.
  • M ceiling (K / N) CBGs
  • (N-mod (K, N)) CBGs may be composed of (N-1) CBs
  • the remaining CBGs may be composed of N CBs.
  • N may mean the minimum number of CBs constituting one CBG
  • N may mean the maximum number of CBs constituting one CBG.
  • all CBs constituting TB belong to a single CBG, and one CBG including K CBs may be configured.
  • Method A-2 Given the total number of CBGs M and constructing each CBG in units of N CBs
  • the total number of CBGs M is predefined with the same single value regardless of TBS or with different TBSs (e.g., proportional to TBS), or semi-static signaling (e.g. RRC signaling) or dynamic signaling (e.g. It may be indicated to the terminal through DCI).
  • the terminal may configure and transmit A / N bits for each CBG.
  • the UE may configure M A / N bits for TB, and each A / N bit may represent an A / N result for the corresponding CBG. .
  • a method of uniformly allocating the number of CBs per CBG to all CBGs may be applied.
  • N floor (K / M) CBG configuration in units of CB
  • mod (K, M) CBGs have (N + 1) (or, ceiling (K / M) pieces ) CB
  • the remaining (M-mod (K, M)) CBGs may consist of N (or floor (K / M)) CBs.
  • N ceiling (K / M) CBG units
  • (M-mod (K, M)) CBGs have (N-1) (or floor (K / M)) CBs
  • the remaining mod (K, M) CBGs may consist of N (or ceiling (K / M)) CBs.
  • N may mean the minimum number of CBs constituting one CBG
  • N may mean the maximum number of CBs constituting one CBG.
  • each of the CBs becomes one CBG, so that a total of K CBGs may be configured.
  • All A / N feedback is composed of M bits, and (M-K) bits that do not correspond to actual CBG are treated as NACK or DTX, or 2) A / N feedback itself corresponds to actual CBG.
  • FIG. 16 illustrates a signal transmission process according to the present invention.
  • the terminal may receive information on the number M of code block groups per transport block from the base station through an upper layer signal (eg, an RRC signal) (S1602). Thereafter, the terminal can receive the initial data transmission from the base station (via PDSCH) (S1604).
  • the data may include a transport block
  • the transport block may include a plurality of code blocks
  • the plurality of code blocks may be divided into one or more code block groups.
  • some of the code block groups may include ceiling (K / M) code blocks, and the remaining code blocks may include flooring (K / M) code blocks.
  • K represents the number of code blocks in the data.
  • the terminal may feed back code block group-based A / N information to the base station for the data (S1606), and the base station may perform data retransmission based on the code block group (S1608).
  • a / N information may be transmitted through PUCCH or PUSCH.
  • the A / N information may include a plurality of A / N bits for data, and each of the A / N bits may represent each A / N response generated in units of code block groups for data.
  • the payload size of the A / N information may remain the same based on M regardless of the number of code block groups constituting the data.
  • Method A-3 CBG Construction Based on Tree (or Nested) Structure for CBG Count M and CBG Size N
  • the CBG may be configured to have a tree structure for the total number of CBGs M (eg, M1, M2, ...) and the CBG size N (eg, N1, N2, ).
  • a plurality of different CBG configurations based on a plurality of different (M, N) combinations may be set for one TB (size).
  • (M, N) combinations considering the CBG configuration in the case of (M1, N1) and (M2, N2), it may be set to N1> N2 when M1 ⁇ M2.
  • one CBG in the case of (M1, N1) may be configured to include one or more CBGs in the case of (M2, N2).
  • one CBG in the case of (M2, N2) may be configured to belong to only one specific CBG in the case of (M1, N1).
  • M2 may be set to a multiple of M1 and / or N1 may be set to a multiple of N2.
  • one (or plural) of the indexes for M, N or (M, N) combinations, or possible CBG indexes based on all (M, N) combinations may be either semi-static signaling (eg, RRC signaling) or dynamic signaling.
  • Eg, DCI may be indicated to the UE.
  • the UE may configure and transmit A / N bits for each CBG configured to correspond to the corresponding index.
  • M and N may be previously defined with the same single value regardless of TBS, or may be predefined with other TBS-specific values (eg, proportional to TBS).
  • One (or plural) of possible CBG indexes based on the combination may be indicated to the UE.
  • the UE may perform decoding and corresponding A / N feedback configuration / transmission with assuming a CBG configuration corresponding to M and / or N index with respect to the scheduled DL data (eg, TB or CBG).
  • the base station may indicate a CBG scheduled for retransmission (via DCI) and / or the terminal may configure and transmit A / N feedback for the indicated CBG.
  • the total number of CBG indexes configured in the nested form L is equally set for each TBS or TBS.
  • the L value for each TBS may be set such that the bit overhead for the CBG indication is the same (eg, the ceiling (log 2 (L)) value is the same).
  • Method A-4 CBs belonging to a certain number of symbol sets (and a certain number of RB sets) into one CBG
  • CBs transmitted through an SG may be configured as one CBG.
  • information about the number of symbols in each SG or the number of symbols constituting a single SG is semi-static signaling (eg, RRC signaling) or dynamic.
  • the terminal may be instructed through signaling (eg, DCI).
  • the UE may configure and transmit A / N bits for each CBG.
  • a plurality of SGs (or RBGs) having nested structure relationships with each other may be configured in a form similar to nested CBG example 1/2/3.
  • the SG (and / or RBG) size / number may be previously defined with the same single value regardless of TBS, or may be predefined with other TB specific values (eg, proportional to TBS).
  • the corresponding CBs are Opt 1) SGs having the lowest or highest symbol indices (and / or the lowest or highest RBs).
  • Opt 2 may be defined as being included in the CBG corresponding to the SG (and / or RBG) including the most encoded bits of the CB.
  • the CB may be the corresponding multiple SGs (/ RBGs) in terms of CBG configuration / instruction for (retransmission) scheduling at the base station. It may be set to be included in all of the plurality of CBG corresponding to.
  • the CB is included in only the CBG corresponding to a specific one of the plurality of SGs (/ RBG), and the A / N bits are configured and transmitted for each CBG. can do.
  • the UE may select one specific CBG including the corresponding CB (when A / N feedback is configured) as follows.
  • the corresponding CBs may operate to be transmitted only once.
  • the CB may be transmitted in a form included only in a specific one of the plurality of CBGs (based on Opt 1/2 application).
  • one CB is set to be commonly included in a plurality of CBGs in terms of CBG configuration / instruction for scheduling of a base station, and a plurality of corresponding CBs are included in view of the UE configuring A / N feedback for each CBG.
  • the method X-1 / 2/3 is applied to belong to each CBG.
  • a plurality of CBs can be configured. Meanwhile, the coded bits for a single CBG may be mapped / transmitted to only one SG or RBG.
  • a method of changing the number of symbols constituting one SG according to the number of symbols allocated to data transmission and / or the number of RBs (or TBS) is possible.
  • the larger the number of symbols allocated to data transmission (to make the number of CBGs the same as possible), the larger the number of symbols per SG.
  • the larger the number of RBs (or TBSs) allocated to data transmission (to make the CBG size as same as possible), the smaller the number of symbols per SG.
  • a method of changing the number of RBs constituting one RBG according to the number of RBs and / or symbol number (or TBS) allocated to data transmission is possible.
  • the larger the number of RBs allocated for data transmission (to make the number of CBGs as equal as possible), the larger the number of RBs per RBG.
  • the larger the number of symbols (or TBS) allocated to data transmission (to make the CBG size as same as possible), the smaller the number of RBs per RBG.
  • Method A-5 Configure the total number of CBGs M and CBG size N for each TBS
  • (M, N) combination for CBG configuration may be set (differently) for each TBS.
  • the number of DCI bits for CBG indication and / or the UCI payload size for corresponding A / N feedback configuration may be determined based on the maximum value M.max among M values set for each TBS.
  • the CBG indication information and / or A / N payload size may be set to M.max, ceiling (M.max / K) or ceiling (log 2 (M.max)) bits.
  • a set of (M, N) combinations to be applied for each TBS is referred to as a TBS-CBG table, and one of the plurality of TBS-CBG tables is semi-finished with a plurality of TBS-CBG tables previously defined / set.
  • a method of instructing the UE through static signaling (eg, RRC signaling) or dynamic signaling (eg, DCI) may be considered.
  • (M, N) combinations corresponding to the same TBS may be configured differently between a plurality of TBS-CBG tables.
  • the terminal determines the (M, N) combination corresponding to the TBS indicated through the DL / UL scheduling DCI with reference to the indicated TBS-CBG table, and based on the determined (M, N) combination, DL / It may be operable to perform UL data transmission and reception and A / N feedback transmission.
  • a different CBG configuration method may be applied to each TBS range while the entire TBS set is divided into a plurality of TBS ranges.
  • the CBG number M is configured differently (or the same CBG size N) for each method A-1 or TBS, whereas for the TBS range 2, the CBG number M for each method A-2 or TBS is configured.
  • TBS range 2 may be configured with TBSs larger than TBSs belonging to TBS range 1.
  • the same CBG configuration (eg, the number / size of CBGs) may be applied to each TBS range, but the number / size of CBGs may be configured differently between the TBS ranges.
  • the number of CBGs M may be identically configured for each method A-2 or TBS, but a different M value may be set between the TBS ranges 1 and 2.
  • M in TBS range 2 may be set to a value larger than M in TBS range 1.
  • the CBG size N may be identically configured for each method A-1 or TBS, but a different N value may be set between the TBS ranges 1 and 2.
  • N in TBS range 2 may be set to a value larger than N in TBS range 1.
  • Method A-6 Interleaving between CBs belonging to the same CBG before data-to-resource mapping
  • Inter-CB interleaving may be applied between the encoded bits. For example, for a plurality of CBs (coded bits) belonging to one CBG, 1) additionally apply inter-CB interleaving with first applying intra-CB interleaving in each CB, or 2) (CBG-based If the HARQ operation is set, only inter-CB interleaving may be applied while intra-CB interleaving is omitted.
  • the data-to-resource mapping includes, for example, an RE mapping based on a frequency-first manner.
  • M, N, and K are set / indicated with the same value for different TBSs, or set / indicated with different values for different TBSs, or some (eg, N) depending on the TBS.
  • the same value may be set / indicated for each of the remaining values (eg, M and K).
  • one symbol set SG may be configured / configured based on the slots in this proposal method. Index is replaced by slot index).
  • Method B-1 Configure / transmit (minimum) range with all NACKs as feedback on CBG index
  • the UE 1 (on a CBG index) first The NB CBG index and the last NACK CBG index may be fed back to the base station, or 2) the first NACK CBG index and the distance between the first NACK and the last NACK may be fed back.
  • 1) and 2) may be signaled using a resource indication indication (RIV) indication method applied to UL resource allocation type 0 or a combination index method applied to UL resource allocation type 1.
  • the CBG configuration scheme may include method A-1 / 2/3/4.
  • the UE directly selects one of a plurality of CBG configuration methods (for example, the number / size of CBGs), and based on the selected CBG configuration, 1) determines a (minimum) CBG range including NACK as described above.
  • the NACK CBG range and the selected CBG configuration information may be fed back to the base station, or 2) the individual A / N bits may be configured for each CBG and fed back to the base station (with the selected CBG configuration information).
  • the CBG configuration scheme may include method A-1 / 2/3/4.
  • the method may be applied to CBG scheduling from a base station.
  • 1) the first and last CBG indexes to which the (re) transmission will be performed, or 2) the first CBG index and the total number of CBGs L to be (re) transmitted may be indicated through the DL data scheduling DCI.
  • the UE may 1) schedule a CBG set corresponding to the indexes in between, including the first and last CBG indexes, or 2) CBG sets corresponding to successive L indexes, including the first CBG index. (Receive) can be operated in the assumed / assumed state.
  • Method B-2 Feedback (minimum size) CBG with all NACKs in CBG configuration of tree structure
  • the UE selects one specific CBG configuration and performs all NACKs based on the selected CBG configuration.
  • the NACK CBG index and the selected CBG configuration information may be fed back to the base station.
  • the NACK CBG is selected as one CBG including all NACKs and having a minimum size.
  • the UE first selects a specific CBG configuration such that a single CBG includes all NACKs with a minimum size among a plurality of CBG configurations having a tree structure, and one CBG index including all NACKs based on the selected corresponding CBG configuration. May be determined and fed back to the base station (with the selected CBG configuration information).
  • the UE selects one CBG configuration based on a specific SG (/ RBG) and determines a CBG index including all NACKs based on the selected CBG configuration, and thus the NACK CBG index and the selected CBG configuration (or corresponding SB ( / RBG) configuration) information is also fed back to the base station.
  • the method may be applied to CBG scheduling from a base station.
  • CBG scheduling from a base station.
  • a plurality of CBG configurations eg, M and / or N (combination), or SG (/ RBG) size / number
  • one One CBG index based on the specific CBG configuration of may be indicated through the DL data scheduling DCI.
  • the UE may operate (receive) in a state where the CBG set belonging to the corresponding CBG index is assumed / regarded as being scheduled through the corresponding DCI.
  • Method B-3 Keep CBG Configuration and Corresponding A / N Configuration the Same During One HARQ Process
  • CBG scheduling (indication) at the base station).
  • the A / N feedback configuration corresponding to the CBG configuration and the CBG configuration can be kept the same.
  • the first applied / instructed CBG and A / N configuration information may be indicated to the terminal through semi-static signaling (eg, RRC signaling) or dynamic signaling (eg, DCI, (initial) DL data scheduling DCI). If the first applied / instructed CBG and A / N configuration information is indicated via semi-static signaling (eg RRC signaling), the CBG and A / N configuration information is fixed statically, until there is a new RRC signaling. It can remain the same in all HARQ processes.
  • semi-static signaling eg, RRC signaling
  • dynamic signaling eg, DCI, (initial) DL data scheduling DCI
  • the UE configures and feeds back A / N bits for each CBG, but may operate to feed back a NACK for the CBG (regardless of whether the corresponding CBG is scheduled) until decoding is successful for each CBG. From the successful decoding, the ACK may be fed back to the CBG (with or without scheduling of the corresponding CBG, and until the end of the corresponding HARQ process).
  • FIG. 17 illustrates a signal transmission process for the present invention.
  • FIG. 17 assumes a situation in which the number of CBGs per TB is set to three and TBs are (re) transmitted for the same HARQ process (that is, an operation before the HARQ process corresponding to the TB is terminated).
  • the terminal may receive CBG # 0 and # 2 from a base station for TB (eg, HARQ process #a) (S1702).
  • the TB of step S1702 may be initial transmission or retransmission corresponding to HARQ process #a.
  • CBG # 1 assumes that decoding has never been successful before.
  • the UE transmits A / N information corresponding to three CBGs to the base station (S1704), but sets A / N information for CBG # 1 to NACK, and A / N for CBG # 0 and # 2.
  • the information is set to ACK or NACK according to the decoding result.
  • the base station retransmits the TB (eg, HARQ process #a) in CBG units, and the terminal may receive CBG # 1 and # 2 for the corresponding TB (S1706).
  • the UE transmits A / N information corresponding to three CBGs to the base station (S1708), but since the decoding was successful, CBG # 0 is set to A / N information for CBG # 0 to ACK.
  • a / N information for CBG # 1 and # 2 is set to ACK or NACK according to the decoding result.
  • Method B-4 Set the corresponding A / N transmission time delay differently according to the number of scheduled CB / CBGs
  • a / N transmission time delay (that is, time interval between A / N feedback transmissions corresponding to DL data reception) may be differently set according to the number of simultaneously scheduled CBs or CBGs for the same TB (size). .
  • the smaller the number of scheduled CBs or CBGs the smaller the corresponding A / N delay may be set.
  • an A / N delay corresponding to a case where some CBs or CBGs are scheduled may be set smaller than when all TBs, that is, all CBs are scheduled.
  • the corresponding A / N delay can be set smaller when fewer CBGs are scheduled.
  • the corresponding A / N delay may be set smaller when the CBG size is configured smaller.
  • Method B-5 Setting CBG Configuration (CBG Count / Size) Differently Between DL Data Scheduling and A / N Feedback
  • the CBG configuration (for example, the number / size of CBGs) applied to DL data scheduling / transmission and the CBG configuration applied to A / N feedback corresponding to DL data reception may be differently set.
  • the CBG configuration may be indicated through DL data scheduling DCI.
  • the (M, N) combination for DL data scheduling and the (M, N) combination for A / N feedback configuration may be set to different values.
  • a combination of (M1, N1) may be configured for DL data scheduling
  • a combination of (M2, N2) may be configured for A / N feedback.
  • Case 1 increases the number of DCI bits while retransmitting DL data resources and A
  • the number of / N feedback bits may be reduced, and in case 2, the number of DCI bits may be reduced while the number of retransmitted DL data resources and A / N feedback bits may be increased.
  • Method B-6 A / N transmission time delay is set differently for each CBG for the scheduled multiple CBGs
  • a / N transmission time delay may be set differently for each CBG for a plurality of simultaneously scheduled CBGs (that is, TDM transmission of A / N for each CBG). Specifically, the A / N delay corresponding to the CBG transmitted through the lower symbol (or slot) index may be set smaller. Through this, the A / N corresponding to the CBG transmitted through the lower symbol (or slot) index may be fed back through a relatively faster symbol (or slot) timing.
  • Method B-7 A / N Feedback Configuration Corresponding to (Re) Transmission Scheduling in TBs (M of CBGs)
  • Semi-static signaling e.g., RRC signaling
  • dynamic signaling e.g., (initial) DL
  • the terminal may be instructed through data scheduling DCI).
  • the A / N payload size (and the PUCCH format for the corresponding A / N transmission) may be set through semi-static signaling (eg, RRC signaling).
  • the total number of CBGs constituting the TB may be determined according to a given (fixed) A / N payload size (eg, M bits).
  • the number of CBGs may be determined as M equal to the number of A / N bits. Accordingly, the number of CBGs constituting TB for different TBSs may be set the same, and the number of CBs constituting one CBG may be set differently (eg, in proportion to the TBS) according to the TBS. On the other hand, if the total number of CBs constituting the TB is equal to or smaller than a given A / N payload size, total A / N feedback may be configured by allocating A / N bits for each CB without grouping the CBs. Can be.
  • the A / N bits are allocated for each CB, but 1) the remaining unassigned A / N for each CB (M-N) 2 bits may be processed as NACK, or 2) the A / N payload size may be changed to N (bits) equal to the total number of CBs.
  • the number of CBs constituting the TB and the CBG configuration may be determined according to a predetermined rule.
  • the A / N payload size and the corresponding PUCCH format may be set based on the number of CBGs set in the TB.
  • the PUCCH format and the candidate PUCCH resource set used for CBG unit A / N transmission for each TBS may be independently configured (differently).
  • the M value and / or the corresponding PUCCH format may be indicated to the terminal through semi-static signaling (eg, RRC signaling) or dynamic signaling (eg (DL data scheduling) DCI).
  • semi-static signaling eg, RRC signaling
  • dynamic signaling eg (DL data scheduling) DCI
  • a specific combination is indicated through the DCI, or a combination of the M value and the PUCCH format through RRC and / or DCI, with a plurality of combinations of (M value, PUCCH format (and candidate PUCCH resource set)) previously specified. Each of these may be indicated independently.
  • the PUCCH format (and candidate PUCCH resource set) predetermined in advance in the corresponding M value may be automatically determined, or when the PUCCH format is indicated, the M value predetermined in the corresponding PUCCH format may be automatically determined.
  • the N value and / or the corresponding PUCCH format may be indicated to the terminal via semi-static signaling (eg, RRC signaling) or dynamic signaling (eg (DL data scheduling) DCI).
  • semi-static signaling eg, RRC signaling
  • dynamic signaling eg (DL data scheduling) DCI
  • a specific combination is indicated through DCI, or a combination of RRC signaling and / or DCI in a state in which a plurality of N values and a plurality of combinations of (M, PUCCH format (and candidate PUCCH resource set)) are previously specified.
  • N value and the PUCCH format can be indicated independently.
  • the PUCCH format (and candidate PUCCH resource set) specified in the M value is automatically determined, or if the PUCCH format is indicated, based on the A / N payload size (eg, M bits) accordingly.
  • the total number of CBGs and the number of CBs per CBG may be automatically determined.
  • Method B-8 A / N feedback configuration corresponding to some CBG (re) transmissions (of M CBGs forming a TB)
  • Opt 1 The same A / N payload size (eg M bits) as in the case of A / N feedback corresponding to TB (re) transmission (as in method B-7) may be applied.
  • the actual A / N is mapped to only L bits (corresponding to the rescheduled CBG), and the remaining (M-L) bits (corresponding to the unscheduled CBG) are the same as in Method B-3.
  • it may be mapped to ACK or NACK, or processed as NACK.
  • a / N payload size (and PUCCH format) different from the case of A / N feedback corresponding to TB (re) transmission may be applied.
  • the A / N payload size (and PUCCH format) may be changed according to the scheduled number of CBGs.
  • the A / N payload may consist of only L bits.
  • L may be semi-fixed to one value through semi-static signaling (eg, RRC signaling) or dynamically changed through dynamic signaling (eg, DL data scheduling DCI).
  • corresponding CBG indication signaling may be configured to enable scheduling of up to L CBGs among the total M CBGs through scheduling DCI in units of CBGs.
  • retransmission scheduling (from the base station) may be performed only on L (L ⁇ M) or less CBGs among the total M CBGs constituting the TB. In this case, when the number of scheduling target CBGs exceeds L, the base station / terminal may perform scheduling (DCI transmission) / A / N feedback in units of TB.
  • Opt 1 and Opt 2 basically maintain the same CBG configuration (e.g., the total number of CBGs that make up TB, and the number of CBs that make up a single CBG) for the first time applied / indicated for TB scheduling / transmission. It can be applied assuming.
  • the A / N payload size is set based on TB (re) transmission (e.g., M bits), but only to configure A / N feedback for the actual scheduled CBG.
  • N feedback may be configured.
  • the base station may also perform retransmission scheduling assuming M CBGs corresponding to the A / N feedback as the entire CBG set.
  • the terminal may map / transmit the indicator to a state corresponding to “TB unit NACK” or “TB retransmission request”.
  • the base station receiving this may perform TB scheduling based on the initial CBG configuration before regrouping.
  • CBG retransmission scheduling DCI corresponding to A / N feedback in Opt 2 1) retransmission CBG indication based on the total number of CBGs regardless of A / N payload size change, 2) UE feedback to NACK Corresponding signaling may be configured in the form of CBG indication under the assumption that one (M or less) CBG set is the entire CBG configuration.
  • Method B-9 A / N feedback in units of CBG only when some (of M CBGs forming a TB) are NACK
  • a / N feedback in units of CBG can be configured / transmitted only when the number of CBGs, which are NACK, out of the total M CBGs constituting the TB is less than or equal to L (L ⁇ M) (eg, individual A / N bits are allocated to each CBG). .
  • L ⁇ M L
  • the number of CBGs that are NACK exceeds L, it may be configured to configure / transmit A / N feedback in units of TB.
  • the retransmission CBG (index) indication through the CBG unit (retransmission) scheduling DCI is 1) an indication of L or less CBGs out of M totals.
  • Method B-10 CBG Retransmission Scheduling and A / N Feedback in which the Maximum Number of CBGs is Limited to M
  • the entire CBG configuration may consist of Mr CBGs (Mr M), and may operate to instruct the UE to retransmit the L CBGs among them (L Mr).
  • M has a fixed value during at least one TB transmission or one HARQ process, while Mr (and L) may change at each (retransmission) scheduling time point.
  • the UE may operate as follows in terms of A / N feedback.
  • a / N feedback can be configured based on the maximum possible number of CBGs.
  • the total A / N payload size may be configured with M bits, but (M-L) bits corresponding to the unscheduled CBG may be processed as NACK or DTX.
  • a / N feedback can be configured based on the total number of CBG Mr at the scheduling time.
  • the total A / N payload size may be configured as Mr bits, but (Mr-L) bits corresponding to CBGs which are not actually scheduled may be processed as NACK or DTX.
  • a / N feedback can be configured based on the number of scheduled CBGs.
  • the total A / N payload size may be configured with L bits to map / transmit A / N bits for each scheduled CBG.
  • the A / N payload size may change according to Mr value or L value, and accordingly, the PUCCH format (and candidate PUCCH resource set) used for A / N feedback transmission may also change. .
  • the total Mr CBG configuration for retransmission scheduling at the base station is configured for the entire CB set constituting the TB (that is, the entire CBG set is the same as the entire TB), or is limited to a specific portion of the entire CB. (Ie, the entire set of CBGs corresponds to a portion of the TB).
  • the Mr value at a certain scheduling time may be limited to be always set to a value less than or equal to the Mr value at the previous scheduling time.
  • the specific specific CB means 1) a set of CBs belonging to the L CBGs scheduled at the previous scheduling time point, or 2) a set of CBs belonging to the CBGs fed back to the NACK from the UE among the scheduled L CBGs. can do.
  • Method B-11 Processing for Subsequent CBGs Retransmitted Prior to A / N Feedback Transmission
  • a situation in which CBG retransmission (hereinafter, subsequent CBG) for the same TB is scheduled before a transmission of A / N feedback (hereinafter, first A / N) corresponding to a specific TB (hereinafter, referred to as original TB) reception may occur.
  • the operation of transmitting the A / N feedback reflecting the reception combining for the subsequent CBG through the first A / N time point may be impossible as the decoding end time point for the subsequent CBG becomes too late.
  • the reception combining may mean an operation of storing a subsequent CBG after emptying (flushing) a buffer in which a previously received signal is stored.
  • the terminal 1) transmits the A / N feedback according to the decoding result at the first A / N time point only for the original TB and performs reception combining (for A / N feedback at a later time point) for the subsequent CBG.
  • a / N feedback according to the decoding result reflecting the reception combining of subsequent CBGs may be transmitted at a later point in time than the first A / N point in time.
  • a / N transmission may be omitted at the first A / N time point or only A / N for the original TB may be transmitted.
  • TX timing 1 the original TB transmission time point
  • TX timing 2 the subsequent CBG transmission time point
  • TX timing 2 the terminal may transmit only the remaining signals except for the CBG corresponding to the subsequent CBG among the original TB signals scheduled through TX timing 1 (eg, puncturing the RE / RB / symbol to which the corresponding CBG is mapped).
  • TX timing 2 subsequent CBGs scheduled for retransmission can be transmitted as they are.
  • TX timing 1 the original TB reception time point
  • TX timing 2 the subsequent CBG reception time point
  • TX timing 2 the subsequent CBG reception time point
  • the UE may receive only the remaining signals except for the CBG corresponding to the subsequent CBG among the original TB signals scheduled through TX timing 1 (for example, puncturing the RE / RB / symbol to which the corresponding CBG is mapped).
  • TX timing 2 the subsequent CBG scheduled for retransmission can be received as it is.
  • Method C-1 Determine the minimum buffer size per CB based on the total number of CBs belonging to the NACK CBG
  • the buffer size Bc Bt / Cn
  • the minimum buffer size per CB may mean, for example, the minimum number of (soft channel) bits that the UE should store in a buffer for each CB for TB transmission.
  • Cn applied to one HARQ process or one TB transmission is determined based on 1) only the first A / N feedback (which is NACK CBG) configured in CBG units (that is, Cn equals to the end of the HARQ process). 2) can be determined based on A / N feedback (double NACK CBG) at each time point (ie, Cn is determined according to NACK CBG at every scheduling / feedback time point). ).
  • the NACK CBG and the terminal feedback from the base station perspective due to A / N errors Inconsistency may occur between one NACK CBG. To eliminate this discrepancy, the following behavior can be considered.
  • the base station operates to always perform retransmission scheduling at once / simultaneously (ie, retransmission scheduling only for some NACK CBGs) for all CBGs fed back from NACK (or not receiving ACK feedback). Disallowed) (the terminal operates under the assumption / care), or
  • Total CBG information (e.g., NACK CBG counts) that allows the base station to perform retransmission scheduling for only some of the total NACK CBGs but is fed back to NACK or needs retransmission (or failed to receive ACK feedback) from the base station perspective / Index) may be considered an operation of instructing the terminal through the DL data scheduling DCI.
  • the (minimum) buffer size Bt per TB allocated to one HARQ process or one TB is fed back to the NACK from the base station perspective, or CBG (s) requiring retransmission (or not receiving ACK feedback).
  • Cn applied to one TB transmission may be determined based on 1) CBG unit retransmission time point first performed (that is, Cn is applied equally to the end of HARQ process), or 2) CnG unit retransmission time point may be determined (ie, CBG unit retransmission point).
  • Cn is determined based on the number of CBGs fed back to NACK at each time point or requiring retransmission (or not receiving ACK feedback).
  • the buffer flush information may include indication information on whether to flush the buffer before emptying the received CBG signal to the buffer or to empty the buffer and to combine the CBG signal with the previously stored CBG signal. If the CBG index has no indication of (re) transmission, the UE is instructed to flush and flush the buffer (or vice versa, to combine the buffer without emptying the buffer). It may operate in the assumed / assumed state as CBG which does not require retransmission. On the contrary, if it is instructed to combine without emptying the buffer (or conversely, to flush and empty the buffer), the UE may not perform any operation on the corresponding CBG index (a corresponding reception buffer).
  • Method C-3 Application of Power Offset to A / N Feedback PUCCH Transmission According to Scheduling in CBG Unit
  • a power offset added / applied to PUCCH transmission carrying A / N feedback configured in CBG units may be determined as a value proportional to the value of Opt 1/2/3/4/5/6/7. Accordingly, as the number of CBGs in Opt 1/2/3/4/5/6/7 increases, the corresponding power offset may be added / applied to a larger value.
  • Method D-1 Inconsistency between A / N information for each CBG fed back by the UE and CBG scheduled for retransmission from the base station
  • An inconsistency (due to an A / N error) may occur between A / N information for each CBG fed back by the UE and a CBG index scheduled for retransmission from the base station corresponding thereto.
  • the CBG index scheduled from the base station does not include a part of the CBG fed back by NACK and / or the CBG already fed back by ACK.
  • the terminal may be set to perform the following operation.
  • Opt 5 may operate to discard the corresponding CBG scheduling DCI.
  • the scheduled CBG includes all of the CBGs previously fed back with NACK, one of Opt 1/2 is applied, and if not, one of Opt 3/4/5 may be applied.
  • Method D-2 Mismatch between CRC applied throughout TB and CRC applied in CB unit and / or CBG unit
  • the received CRC check result (eg, pass / fail) in the terminal may be different between the CRC applied to the entire TB, the CRC applied in the CB unit, and the CRC applied in the CBG unit.
  • the pass of the CRC check result means that the corresponding data block has been successfully / correctly detected
  • the fail of the CRC check result means that the corresponding data block was not successfully / correctly detected.
  • the CRC check results in CB and / or CBG units are all pass (i.e., CB CRC based CRC check is pass), whereas the CRC check result of the entire TB may be fail (i.e., TB CRC based CRC check is Fail).
  • the CRC check result of at least one CB and / or CBG unit is a fail (ie, a CB CRC based CRC check is a fail)
  • the CRC check result of the entire TB may be a pass (ie, a TB CRC based CRC check). Pass).
  • the UE may apply one of Opt 3/4/5 of the method D-1.
  • Opt 3/4/5 of Method D-1 is as follows.
  • the CBG scheduling DCI may be discarded (discard).
  • all of the CB unit CRC check results belonging to one specific CBG are pass, while the CRC check results of the entire CBG may be fail.
  • the CRC check result of the entire CBG may be a pass.
  • the UE may feedback by mapping to NACK with respect to the corresponding CBG, or may apply one of Opt 3/4/5 of the method D-1.
  • each RB field may be configured for each CBG, but each size may be configured to be smaller than the RV field of the TBI scheduling DCI. May be less than in the case of TB scheduling.
  • Method E-2 Performing Retransmission Scheduling for Some CBGs (of M CBGs constituting TB)
  • Retransmission scheduling may be performed only for up to L CBGs (L ⁇ M) of the total M CBGs constituting the TB.
  • L may be indicated to the terminal through semi-static signaling (eg, RRC signaling).
  • up to L CBGs among the total M CBGs may be indicated through the CBG unit scheduling DCI from the base station, and the TB unit scheduling DCI (or TB unit in the DCI) may be used for retransmission scheduling for more than L CBGs.
  • a flag indicating (re) transmission scheduling) may be applied.
  • the NDI field can be interpreted differently depending on whether it is (re) transmission for the entire TB or for some CBGs (of all CBGs constituting the TB). For example, it may be operable to recognize a combination of toggled NDI bits as scheduling for new data transmission while indicating that all CBGs configuring the TB are transmitted through DCI. Accordingly, a case in which only part of the entire CBG is indicated to be transmitted via DCI may be considered retransmission (not new data), and the NDI field may be used for another specific purpose. As another example, an indicator indicating whether transmission is performed for the entire TB or some CBG through DCI may be directly signaled.
  • the NDI field may include: 1) combining the received CBG signal with a signal previously stored in a reception buffer corresponding to the corresponding CBG index or storing a previously stored signal. It may indicate whether to flush and empty only the received CBG signal (i.e., CBG bufferflush indicator, CBGFI), or 2) (re) transmit CBG (index), (i.e., CBG transmission indicator, CBGTI).
  • the buffer flush indicator field may be interpreted differently in case of data retransmission (without NDI toggling) and in case of new data transmission (with NDI toggling). For example, in case of data retransmission, it may be used to indicate whether to flush or empty the buffer before storing the received CBG signal in the buffer according to the original purpose of the buffer flush indicator (for each CBG). . On the other hand, in the case of new data transmission, the buffer flush indicator may be used for other specific purposes since it basically assumes a buffer flush operation before storing the received signal. When the buffer flush indicator field is used for another specific purpose, the buffer flush indicator field may include a bit indicating TBS and / or MCS information of data to be scheduled. In contrast, the TBS / MCS field may include TBS / MCS information in the DCI scheduling new data transmission, while the TBS / MCS field may include a bit configuring a buffer flush indicator in the DCI scheduling data retransmission.
  • each bit constituting the CBGTI field can be used to individually indicate the presence or absence of (re) transmission for each CBG index. For example, bit “1" may indicate that the CBG (corresponding to the corresponding bit) is (re) transmitted, and bit “0" may indicate that the corresponding CBG is not (re) transmitted.
  • the CBGFI field / bit may be used to indicate whether or not the buffer is flushed for the CBG indicated by the (re) transmission through the CBGTI field. For example, bit “1” may indicate to flush the buffer (for the CBG to which (re) transmission is indicated), and bit "0" may indicate not to flush the buffer.
  • the (terminal) may define / refer that the buffer flush operation for all CBGs is indicated while the (re) transmission is indicated for all CBGs constituting a given TB. Accordingly, the terminal may operate to store the newly received CBG signal in the buffer after flushing the signal previously stored in the buffer.
  • CBG mode 1 when NDI is not toggled
  • all bits constituting the CBGTI field may be indicated as "1”.
  • the (terminal) may define / refer that the (re) transmission is indicated for all CBGs constituting a given TB without a buffer flush operation.
  • CBG mode 2 In a state in which both the CBGTI field and the CBGFI field are configured / set in the DCI (hereinafter, CBG mode 2), all bits constituting the CBGTI field (NDI is not toggled) may be indicated as "0".
  • the (terminal) may define / refer that the (re) transmission is indicated for all CBGs constituting a given TB.
  • the CBGFI bit is indicated as "0"
  • the (terminal) can be defined / recognized as indicated that the buffer flush operation is indicated for certain CBG (hereinafter, CBG sub-group1)
  • Case 2) When the CBGFI bit is indicated as "1", it may be defined / represented that a buffer flush operation is indicated for another specific some CBG (hereinafter, CBG sub-group2).
  • the CBG (s) belonging to the CBG sub-group1 and the CBG sub-group2 may be configured completely exclusively or partially identical to each other (although the union of the CBGs is the entire CBG set).
  • retransmission scheduling by CBG unit and A / N feedback configuration operation for each CBG may not be applied / set. Accordingly, retransmission scheduling in CBG units and A / N feedback configuration operations for each CBG units may be applied / configured only for general scheduling-based DL / UL data transmission and not for SPS, and in units of TB for SPS-based DL / UL data transmission. Scheduling and per TB (ie TB level) A / N feedback (eg, configuring / sending 1-bit A / N for one TB) may be applied / set.
  • transmission of a terminal (group) CSS-based DCI (or TM-common DCI format in a form similar to (commonly set / used for different TMs) similar to DCI format 0 / 1A in LTE, for example, LTE)
  • the configuration action may not be applied / set.
  • CBG-based retransmission scheduling and A / N feedback configuration operation only for DL / UL data transmission scheduled through USS based DCI (or TM-only DCI format that is set / used only for a specific TM) rather than CSS.
  • USS based DCI or TM-only DCI format that is set / used only for a specific TM
  • CSS-based DCI or TM-common DCI format
  • the UE may perform A / N per CBG to reduce A / N payload. If bundling or A / N bundling operation is indicated from the base station) to configure TB level A / N feedback, (case 1) transmit only A / N for a single TB without multiplexing, or (case 2) multiple TBs.
  • the A / N method may vary depending on whether multiple A / Ns are transmitted by multiplexing.
  • case 1 only 1-bit A / N payload is configured, and then A / N can be transmitted using a PUCCH format / resource supporting small payload (eg, up to 2 bits).
  • case 2 when the number of CBGs per TB is set to N, Opt 1) repeatedly maps A / N for TB to the corresponding N bits, or Opt 2) specifies A / N for TB. For example, lowest) may be mapped to 1-bit corresponding to the CBG index.
  • Opt 1) and Opt 2) may be applied irrespective of case 2 in a situation in which retransmission scheduling in CBG units and A / N feedback configuration for each CBG are set.
  • the UE configures a multi-bit A / N payload including N-bit A / N corresponding to the corresponding TB to support a large payload (eg, 3 bits or more).
  • a / N can be transmitted as a resource.
  • the multi-bit A / N payload may include A / N information corresponding to a plurality of TBs.
  • the multi-bit A / N payload may include a plurality of N-bit A / Ns corresponding to a plurality of TBs.
  • the intentional URLLC puncturing operation described above when the intentional URLLC puncturing operation described above is applied in a co-channel inter-cell environment, at least a DMRS signal in which a URLLC signal transmitted in one cell is used to receive DL / UL data in another cell is used. It may be desirable to minimize the impact of interference on the system. To this end, an operation of transferring / exchanging symbol position information to be used for DMRS transmission in each cell and / or symbol position information to be used for URLLC (puncturing) transmission in each cell may be considered.
  • the proposed methods of the present invention may not be limited to DL data scheduling and transmission situations, and may be equally or similarly applied to UL data scheduling and transmission situations (eg, CB / CBG configuration according to TB, UL data transmission timing setting, CBG scheduling DCI configuration, etc.).
  • DL data (scheduling DCI) may be replaced with UL data (scheduling DCI).
  • FIG. 18 illustrates a base station and a terminal that can be applied to the present invention.
  • a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120.
  • BS base station
  • UE terminal
  • the wireless communication system includes a relay
  • the base station or the terminal may be replaced with a relay.
  • Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
  • the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
  • the memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112.
  • the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
  • the terminal 120 includes a processor 122, a memory 124, and a radio frequency unit 126.
  • the processor 122 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
  • the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • embodiments of the present invention have been described mainly based on a signal transmission / reception relationship between a terminal and a base station. This transmission / reception relationship is extended to the same / similarly for signal transmission / reception between the terminal and the relay or the base station and the relay.
  • Certain operations described in this document as being performed by a base station may, in some cases, be performed by their uppernodes. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the present invention can be used in a terminal, base station, or other equipment of a wireless mobile communication system.

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

Abstract

La présente invention concerne un système de communication sans fil et, en particulier, un procédé comprenant : une étape de décodage de CBG formant un TB ; une étape de re-réception du TB après le décodage ; et une étape de transmission d'une pluralité de bits HARQ-ACK pour la re-réception du TB, chaque bit HARQ-ACK représentant une réponse HARQ-ACK à chaque CBG du TB, un bit ACK-ACK pour un premier CBG, qui a été décodé avec succès avant la re-réception du TB parmi la pluralité de bits HARQ-ACK, étant mis en correspondance avec un ACK indépendamment du fait que le premier CBG soit reçu ou pas pendant la re-réception du TB ; et un appareil associé.
PCT/KR2018/002743 2017-03-08 2018-03-08 Procédé et appareil d'émission et de réception d'un signal sans fil dans un système de communication sans fil WO2018164495A1 (fr)

Priority Applications (29)

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CN201880016978.3A CN110392995B (zh) 2017-03-08 2018-03-08 在无线通信***中发送和接收无线电信号的方法和装置
CN202210857257.3A CN115361102B (zh) 2017-03-08 2018-03-08 在无线通信***中发送和接收无线电信号的方法和装置
US16/065,739 US11012221B2 (en) 2017-03-08 2018-03-08 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
JP2019501529A JP6833971B2 (ja) 2017-03-08 2018-03-08 無線通信システムにおいて無線信号の送受信方法及び装置
ES18764554T ES2892448T3 (es) 2017-03-08 2018-03-08 Método y aparato para transmitir y recibir señales de radio en un sistema de comunicación inalámbrica
CN202210851661.XA CN115361101A (zh) 2017-03-08 2018-03-08 在无线通信***中发送和接收无线电信号的方法和装置
BR112019000645-1A BR112019000645B1 (pt) 2017-03-08 2018-03-08 Método e aparelho de comunicação para transmitir informações de confirmação arq híbrida (harq-ack) com base em grupo de bloco de código (cbg) em um sistema de comunicação sem fio
AU2018232784A AU2018232784B2 (en) 2017-03-08 2018-03-08 Method and apparatus for transmitting and receiving wireless signal in wireless communication system
SG11201900089XA SG11201900089XA (en) 2017-03-08 2018-03-08 Method and apparatus for transmitting and receiving wireless signal in wireless communication system
CA3052414A CA3052414C (fr) 2017-03-08 2018-03-08 Procede et appareil d'emission et de reception d'un signal sans fil dans un systeme de communication sans fil
EP18764554.4A EP3499771B1 (fr) 2017-03-08 2018-03-08 Procédé et appareil d'émission et de réception d'un signal sans fil dans un système de communication sans fil
CN202210851485.XA CN115361100A (zh) 2017-03-08 2018-03-08 在无线通信***中发送和接收无线电信号的方法和装置
RU2019100538A RU2735328C1 (ru) 2017-03-08 2018-03-08 Способ и устройство для передачи и приема радиосигнала в системе беспроводной связи
EP22187551.1A EP4102752A1 (fr) 2017-03-08 2018-03-08 Procédé et appareil de transmission et de réception de signaux radio dans un système de communication sans fil
EP22199036.9A EP4135236B1 (fr) 2017-03-08 2018-03-08 Procédé et appareil d'émission et de réception de signaux radio dans un système de communication sans fil
CN202110510129.7A CN113411892B (zh) 2017-03-08 2018-03-08 在无线通信***中发送和接收无线电信号的方法和装置
MX2019000572A MX2019000572A (es) 2017-03-08 2018-03-08 Metodo y aparato para transmitir y recibir señales de radio en un sistema de comunicacion inalambrica.
EP19212163.0A EP3633896B1 (fr) 2017-03-08 2018-03-08 Procédé et appareil de transmission et de réception de signaux radio dans un système de communication sans fil
US16/262,373 US10721046B2 (en) 2017-03-08 2019-01-30 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
PH12019501897A PH12019501897A1 (en) 2017-03-08 2019-08-15 Method and apparatus for transmitting and receiving wireless signal in wireless communication system
US15/930,694 US11038655B2 (en) 2017-03-08 2020-05-13 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US16/944,442 US12058076B2 (en) 2017-03-08 2020-07-31 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/003,449 US11621821B2 (en) 2017-03-08 2020-08-26 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/036,800 US11012223B2 (en) 2017-03-08 2020-09-29 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/235,319 US11968147B2 (en) 2017-03-08 2021-04-20 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/308,684 US11271702B2 (en) 2017-03-08 2021-05-05 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/967,432 US11956173B2 (en) 2017-03-08 2022-10-17 Method and Apparatus for transmitting and receiving radio signals in a wireless communication system
US17/967,478 US11956174B2 (en) 2017-03-08 2022-10-17 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US18/444,118 US20240195583A1 (en) 2017-03-08 2024-02-16 Method and apparatus for transmitting and receiving radio signals in a wireless communication system

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US201762468380P 2017-03-08 2017-03-08
US62/468,380 2017-03-08
US201762469546P 2017-03-10 2017-03-10
US62/469,546 2017-03-10
US201762475860P 2017-03-23 2017-03-23
US62/475,860 2017-03-23
US201762501048P 2017-05-03 2017-05-03
US62/501,048 2017-05-03
US201762520562P 2017-06-16 2017-06-16
US62/520,562 2017-06-16
US201762566339P 2017-09-30 2017-09-30
US62/566,339 2017-09-30
KR1020180027207A KR101943327B1 (ko) 2017-03-08 2018-03-08 무선 통신 시스템에서 무선 신호 송수신 방법 및 장치
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US16/262,373 Continuation US10721046B2 (en) 2017-03-08 2019-01-30 Method and apparatus for transmitting and receiving radio signals in a wireless communication system
US17/003,449 Continuation US11621821B2 (en) 2017-03-08 2020-08-26 Method and apparatus for transmitting and receiving radio signals in a wireless communication system

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CN114128200A (zh) * 2019-07-24 2022-03-01 夏普株式会社 具有不同服务类型的harq-ack码本的sr传输的优先级区分
CN111800864B (zh) * 2019-07-30 2023-10-27 维沃移动通信有限公司 物理上行链路控制信道传输方法、装置、设备及介质
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CN111758297B (zh) * 2020-05-12 2023-08-29 北京小米移动软件有限公司 信道检测方法及装置、通信设备及存储介质
CN111758297A (zh) * 2020-05-12 2020-10-09 北京小米移动软件有限公司 信道检测方法及装置、通信设备及存储介质
CN112770355A (zh) * 2020-12-31 2021-05-07 展讯通信（上海）有限公司 信息接收方法及装置、计算机可读存储介质

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