WO2022030813A1 - 무선 통신 시스템에서 그룹캐스트를 위한 신호 송/수신 방법 및 장치 - Google Patents

무선 통신 시스템에서 그룹캐스트를 위한 신호 송/수신 방법 및 장치 Download PDF

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Publication number
WO2022030813A1
WO2022030813A1 PCT/KR2021/009303 KR2021009303W WO2022030813A1 WO 2022030813 A1 WO2022030813 A1 WO 2022030813A1 KR 2021009303 W KR2021009303 W KR 2021009303W WO 2022030813 A1 WO2022030813 A1 WO 2022030813A1
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WIPO (PCT)
Prior art keywords
data
harq feedback
transmitted
terminal
information
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Ceased
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PCT/KR2021/009303
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English (en)
French (fr)
Korean (ko)
Inventor
여정호
김영범
배태한
박성진
신철규
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to KR1020237004319A priority Critical patent/KR20230048033A/ko
Priority to EP21853990.6A priority patent/EP4191918A4/en
Priority to JP2023507834A priority patent/JP7777120B2/ja
Priority to CN202180057213.6A priority patent/CN116057969B/zh
Priority to US18/040,785 priority patent/US20230362932A1/en
Publication of WO2022030813A1 publication Critical patent/WO2022030813A1/ko
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting/receiving signals for groupcast and/or multicast.
  • 5G 5th-generation
  • connected devices which are on an explosive increase, will be connected to the communication network.
  • things connected to the network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machines, and factory equipment.
  • Mobile devices are expected to evolve into various form factors such as augmented reality glasses, virtual reality headsets, and hologram devices.
  • 6G 6th-generation
  • efforts are being made to develop an improved 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a system after 5G communication (Beyond 5G).
  • the maximum transmission speed is tera (that is, 1000 gigabytes) bps
  • the wireless latency is 100 microseconds ( ⁇ sec). That is, the transmission speed in the 6G communication system is 50 times faster than in the 5G communication system, and the wireless delay time is reduced by one-tenth.
  • 6G communication systems use the terahertz band (for example, the 95 gigahertz (95 GHz) to 3 terahertz (3 THz) band). implementation is being considered.
  • the terahertz band compared to the millimeter wave (mmWave) band introduced in 5G, the importance of technology that can guarantee the signal reach, that is, the coverage, is expected to increase due to more severe path loss and atmospheric absorption.
  • mmWave millimeter wave
  • the next hyper-connected experience (the next hyper-connected) through the hyper-connectivity of the 6G communication system, which includes not only the connection between objects but also the connection between people and objects. experience) is expected to become possible.
  • the 6G communication system is expected to provide services such as true immersive extended reality (XR), high-fidelity mobile hologram, and digital replica.
  • services such as remote surgery, industrial automation, and emergency response through security and reliability enhancement are provided through the 6G communication system, so it is applied in various fields such as industry, medical care, automobiles, and home appliances.
  • a base station may provide a groupcast service and/or a multicast service by transmitting the same data to several terminals.
  • a groupcast service and/or a multicast service are provided to each terminal through separate data transmission/reception, inefficiency of frequency resources and time resources may result. Accordingly, there is a need to provide a method and apparatus for efficiently performing data transmission/reception in order to provide a groupcast service and/or a multicast service.
  • One aspect of the present disclosure is to provide a method and apparatus for transmitting and receiving a signal for groupcast and/or multicast in a wireless communication system.
  • Another aspect of the present disclosure is to provide a method and apparatus for transmitting/receiving HARQ feedback information for data for groupcast and/or multicast in a wireless communication system.
  • Another aspect of the present disclosure is to provide a signal transmission/reception method and apparatus in consideration of a relationship between data for groupcast and/or multicast and data for unicast and/or broadcast in a wireless communication system.
  • Another aspect of the present disclosure is when data for groupcast and/or multicast and data for unicast and/or broadcast are received together in a wireless communication system, data processing of RRC_connected terminal and HARQ feedback information transmission/reception To provide a method and apparatus.
  • Another aspect of the present disclosure is to provide a method and apparatus for an RRC_connected terminal receiving data for groupcast and/or multicast in a wireless communication system according to its capability to receive data for groupcast and/or multicast it is in
  • a method performed by a transmitting apparatus in a wireless communication system includes: a group common-physical downlink shared channel through which the multicast data is transmitted, comprising information related to hybrid automatic repeat request (HARQ) feedback for multicast data Transmitting first control information for scheduling a common-physical downlink shared channel: GC-PDSCH) through a physical downlink control channel (PDCCH); and second control information for scheduling a physical downlink shared channel (PDSCH) through which the unicast data is transmitted, including information related to HARQ feedback for unicast data, the PDCCH It may include the process of transmitting through a group common-physical downlink shared channel through which the multicast data is transmitted, comprising information related to hybrid automatic repeat request (HARQ) feedback for multicast data Transmitting first control information for scheduling a common-physical downlink shared channel: GC-PDSCH) through a physical downlink control channel (PDCCH); and second control information for scheduling a physical downlink shared channel (PDSCH) through which the unicast data is transmitted, including information related to HARQ
  • a method performed by a receiving device in a wireless communication system includes: a group common-physical downlink shared channel through which the multicast data is transmitted, comprising information related to hybrid automatic repeat request (HARQ) feedback for multicast data
  • HARQ hybrid automatic repeat request
  • HARQ hybrid automatic repeat request
  • a transmission apparatus may be provided in a wireless communication system.
  • the apparatus includes: a transceiver; and at least one processor, the at least one processor comprising: information related to a hybrid automatic repeat request (HARQ) feedback for multicast data via the transceiver; First control information for scheduling a group common-physical downlink shared channel (GC-PDSCH) through which the multicast data is transmitted physical downlink control channel (PDCCH) and schedule a physical downlink shared channel (PDSCH) through which the unicast data is transmitted, including information related to HARQ feedback for unicast data, through the transceiver It may be configured to transmit the second control information through the PDCCH.
  • HARQ hybrid automatic repeat request
  • a receiving apparatus may be provided in a wireless communication system.
  • the apparatus includes: a transceiver; and at least one processor, the at least one processor comprising: information related to a hybrid automatic repeat request (HARQ) feedback for multicast data via the transceiver; First control information for scheduling a group common-physical downlink shared channel (GC-PDSCH) through which the multicast data is transmitted physical downlink control channel (PDCCH) Receiving first control information for scheduling through a physical downlink control channel (PDCCH), and through the transceiver, including information related to HARQ feedback for unicast data, the The second control information for scheduling a physical downlink shared channel (PDSCH) through which unicast data is transmitted may be configured to be received through the PDCCH.
  • HARQ hybrid automatic repeat request
  • a method of a transmitting apparatus proposed in various embodiments of the present disclosure includes: In a method of a transmitting apparatus in a wireless communication system, whether to transmit hybrid automatic repeat request (HARQ) feedback information for groupcast data
  • HARQ hybrid automatic repeat request
  • a method of a receiving device proposed by various embodiments of the present disclosure includes: a method of a receiving device in a wireless communication system, the method comprising: receiving a signal from a transmitting device; From the signal, information related to whether to transmit hybrid automatic repeat request (HARQ) feedback information for groupcast data, and processing of groupcast data, unicast data and/or broadcast data and identifying at least one of information related to the priority of the data.
  • HARQ hybrid automatic repeat request
  • a transmitting apparatus proposed by various embodiments of the present disclosure includes: a transmitting apparatus in a wireless communication system, comprising: a transceiver for transmitting and receiving a signal; Generates information related to whether to transmit hybrid automatic repeat request (HARQ) feedback information for groupcast data, and prioritizes processing of groupcast data and unicast data and/or broadcast data Information related to generating information related to priority and transmitting HARQ feedback information for the group data through the transceiver and priority for processing the groupcast data, unicast data, and/or broadcast data and a processing unit for transmitting at least one of information related to ranking.
  • HARQ hybrid automatic repeat request
  • a receiving device proposed by various embodiments of the present disclosure includes: a receiving device in a wireless communication system, comprising: a transceiver configured to receive a signal from a transmitting device; From the signal, information related to whether to transmit hybrid automatic repeat request (HARQ) feedback information for groupcast data, and processing of groupcast data, unicast data and/or broadcast data and a processing unit for identifying at least one of the information related to the priority of the data.
  • HARQ hybrid automatic repeat request
  • One aspect of the present disclosure has the effect of making it possible to provide a method and apparatus for transmitting and receiving a signal for groupcast and/or multicast in a wireless communication system.
  • Another aspect of the present disclosure has the effect of making it possible to provide a method and apparatus for transmitting/receiving HARQ feedback information for data for groupcast and/or multicast in a wireless communication system.
  • Another aspect of the present disclosure makes it possible to provide a signal transmission/reception method and apparatus in consideration of a relationship between data for groupcast and/or multicast and data for unicast and/or broadcast in a wireless communication system have an effect
  • Another aspect of the present disclosure is when data for groupcast and/or multicast and data for unicast and/or broadcast are received together in a wireless communication system, data processing of RRC_connected terminal and HARQ feedback information transmission/reception It has the effect of making it possible to provide a method and an apparatus.
  • Another aspect of the present disclosure is to provide a method and apparatus for an RRC_connected terminal receiving data for groupcast and/or multicast in a wireless communication system according to its capability to receive data for groupcast and/or multicast It has the effect of making it possible.
  • 1 is a diagram illustrating a downlink or uplink time-frequency domain transmission structure of a 5G (or NR, New Radio) system.
  • FIG. 2 is a diagram illustrating a control region in which a downlink control channel is transmitted in a 5G wireless communication system.
  • FIG. 3 is a diagram illustrating an example in which eMBB, URLLC, and mMTC data are allocated from frequency-time resources in a communication system.
  • FIG. 4 is a diagram illustrating another example in which eMBB, URLLC, and mMTC data are allocated from frequency-time resources in a communication system.
  • FIG. 5 is a diagram illustrating an example in which one transport block is divided into several code blocks and a CRC is added.
  • FIG. 6 is a diagram illustrating a state in which a synchronization signal and a physical broadcast channel of an NR system are mapped in the frequency and time domains.
  • FIG. 7 is a diagram illustrating symbols in which SS/PBCH blocks can be transmitted according to subcarrier intervals.
  • FIG. 8 is a diagram illustrating a processing time of a terminal according to a timing advance when the terminal receives a first signal and the terminal transmits a second signal corresponding thereto in the 5G or NR system according to the disclosed embodiment.
  • 9 is a diagram illustrating an example of scheduling and transmitting data (eg, TBs) according to slots, receiving HARQ-ACK feedback for the corresponding data, and performing retransmission according to the feedback.
  • data eg, TBs
  • FIG. 10 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure
  • FIG. 11 is a diagram schematically illustrating another example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure
  • FIG. 12 is a diagram schematically illustrating an internal structure of an example base station according to embodiments of the present disclosure.
  • FIG. 13 is a diagram schematically illustrating an internal structure of an example terminal according to embodiments of the present disclosure.
  • FIG. 14 is a block diagram schematically illustrating an internal structure of a terminal according to embodiments of the present disclosure.
  • 15 is a block diagram schematically illustrating an internal structure of a base station according to embodiments of the present disclosure.
  • NR New Radio access technology
  • 5G communication a new 5G communication
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable and low-latency communications
  • eMBB is a high-speed transmission of high-capacity data
  • mMTC is a service that minimizes terminal power and connects multiple terminals
  • URLLC is a service that aims for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal.
  • a plurality of services can be provided to a user in a communication system, and in order to provide such a plurality of services to a user, a method and an apparatus using the same are required to provide each service within the same time period according to characteristics. .
  • each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions.
  • These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions.
  • These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory.
  • the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s).
  • the computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may be performed substantially simultaneously, or the blocks may sometimes be performed in the reverse order according to a corresponding function.
  • ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA or ASIC, and ' ⁇ unit' performs certain roles.
  • '-part' is not limited to software or hardware.
  • ' ⁇ ' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Accordingly, as an example, ' ⁇ ' indicates components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and ' ⁇ units' may be combined into a smaller number of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
  • components and ' ⁇ units' may be implemented to play one or more CPUs in a device or secure multimedia card.
  • ' ⁇ unit' may include one or more processors.
  • a wireless communication system for example, 3GPP high speed packet access (HSPA), long term evolution (LTE) or evolved universal terrestrial radio access (E-UTRA), LTE-Advanced (LTE-A), 3GPP2 HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE 802.16e, such as communication standards, such as high-speed and high-quality packet data service is developed as a broadband wireless communication system are doing
  • a communication standard of 5G or NR new radio
  • 5G wireless communication system for example, 3GPP high speed packet access (HSPA), long term evolution (LTE) or evolved universal terrestrial radio access (E-UTRA), LTE-Advanced (LTE-A), 3GPP2 HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE 802.16e, such as communication standards, such as high-speed and high-quality packet data service is developed as a broadband wireless communication system are doing
  • a communication standard of 5G or NR new radio is being made as a 5G wireless communication system.
  • an orthogonal frequency division multiplexing (OFDM) scheme is adopted in a downlink (DL) and an uplink in the NR system.
  • OFDM orthogonal frequency division multiplexing
  • CP-OFDM cyclic-prefix OFDM
  • DFT-S-OFDM discrete Fourier transform spreading OFDM
  • Uplink refers to a radio link in which a user equipment (UE) or mobile station (MS) transmits data or control signals to a base station (gNode B, or base station (BS)). It means a wireless link that transmits data or control signals.
  • the data or control information of each user is divided by allocating and operating the time-frequency resources to which data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. do.
  • the NR system employs a hybrid automatic repeat request (HARQ) method for retransmitting the corresponding data in the physical layer when a decoding failure occurs in the initial transmission.
  • HARQ hybrid automatic repeat request
  • the receiver when the receiver fails to correctly decode (decode) data, the receiver transmits information (negative acknowledgment: NACK) informing the transmitter of decoding failure so that the transmitter can retransmit the data in the physical layer.
  • NACK negative acknowledgment
  • the receiver combines the data retransmitted by the transmitter with the previously unsuccessful data to improve data reception performance.
  • ACK acknowledgenowledgment
  • FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which the data or control channel is transmitted in downlink or uplink in an NR system.
  • the horizontal axis represents the time domain
  • the vertical axis represents the frequency domain.
  • the minimum transmission unit in the time domain is an OFDM symbol, and Nsymb (102) OFDM symbols are gathered to form one slot (106).
  • the length of the subframe is defined as 1.0 ms
  • the radio frame 114 is defined as 10 ms.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of a total of NBW 104 subcarriers.
  • One frame may be defined as 10 ms.
  • One subframe may be defined as 1 ms, and therefore, one frame may consist of a total of 10 subframes.
  • One subframe may consist of one or a plurality of slots, and the number of slots per one subframe may vary according to a setting value ⁇ for the subcarrier spacing.
  • ⁇ for the subcarrier spacing
  • each subcarrier spacing setting ⁇ and may be defined in Table 1 below.
  • the terminal before the RRC (radio resource control) connection may receive an initial bandwidth part (initial BWP) for initial access set from the base station through a master information block (MIB). More specifically, a physical downlink control channel (PDCCH) for the UE to receive system information (remaining system information; RMSI or system information block 1; may correspond to SIB1) required for initial access through the MIB in the initial access step. ) may be transmitted, and configuration information for a control resource set (CORESET) and a search space may be received.
  • the control region and the search space set by the MIB may be regarded as identifier (Identity, ID) 0, respectively.
  • the base station may notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for the control region #0 through the MIB.
  • the base station may notify the UE of configuration information on the monitoring period and occasion for the control region #0, that is, configuration information on the search space #0 through the MIB.
  • the UE may regard the frequency domain set as the control region #0 obtained from the MIB as an initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be regarded as 0.
  • MIB may include the following information.
  • terminals before RRC connection may receive configuration information for the initial bandwidth part through the MIB in the initial access step. More specifically, the UE may receive a control region for a downlink control channel through which downlink control information (DCI) scheduling SIB can be transmitted from the MIB of a physical broadcast channel (PBCH).
  • DCI downlink control information
  • PBCH physical broadcast channel
  • the bandwidth of the control region configured as the MIB may be regarded as an initial bandwidth portion
  • the terminal may receive a physical downlink shared channel (PDSCH) through which the SIB is transmitted through the configured initial bandwidth portion.
  • the initial bandwidth portion may be utilized for other system information (OSI), paging, and random access in addition to the purpose of receiving the SIB.
  • OSI system information
  • the base station may instruct the terminal to change the bandwidth part by using a bandwidth part indicator field in DCI.
  • a basic unit of a resource in the time-frequency domain is a resource element 112 (RE), and may be represented by an OFDM symbol index and a subcarrier index.
  • a resource block 108 (resource block; RB or physical resource block; PRB) is defined as NRB 110 consecutive subcarriers in the frequency domain.
  • the minimum transmission unit of data is the RB unit.
  • the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other.
  • the channel bandwidth represents an RF bandwidth corresponding to a system transmission bandwidth.
  • Table 2 and Table 3 show a part of the correspondence between the system transmission bandwidth, subcarrier spacing, and channel bandwidth defined in the NR system in a frequency band lower than 6 GHz and a frequency band higher than 6 GHz, respectively. indicates.
  • N/A may be a bandwidth-subcarrier combination not supported by the NR system.
  • the frequency range may be divided into FR1 and FR2 and defined as shown in Table 4 below.
  • FR1 and FR2 may be changed and applied differently.
  • the frequency range of FR1 may be changed and applied from 450 MHz to 6000 MHz.
  • the SS/PBCH block may mean a physical layer channel block composed of a primary SS (PSS), a secondary SS (SSS), and a PBCH. Specifically, it is as follows.
  • - PSS A signal that serves as a reference for downlink time/frequency synchronization and provides some information on cell ID.
  • - SSS serves as a reference for downlink time/frequency synchronization, and provides remaining cell ID information not provided by PSS. Additionally, it may serve as a reference signal for demodulation of the PBCH.
  • the essential system information may include search space-related control information indicating radio resource mapping information of a control channel, scheduling control information on a separate data channel for transmitting system information, and the like.
  • the SS/PBCH block consists of a combination of PSS, SSS, and PBCH.
  • One or a plurality of SS/PBCH blocks may be transmitted within 5 ms, and each transmitted SS/PBCH block may be distinguished by an index.
  • the UE may detect the PSS and SSS in the initial access stage and may decode the PBCH.
  • the UE may obtain the MIB from the PBCH and may be configured with control region #0 (which may correspond to a control region having a control region index of 0) therefrom.
  • the UE may perform monitoring on the control region #0, assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted in the control region #0 are quasi co location (QCL).
  • the terminal may receive system information as downlink control information transmitted in control region #0.
  • the terminal may acquire configuration information related to random access channel (RACH) necessary for initial access from the received system information.
  • RACH random access channel
  • the UE may transmit a physical RACH (PRACH) to the base station in consideration of the selected SS/PBCH index, and the base station receiving the PRACH may obtain information on the SS/PBCH block index selected by the UE.
  • PRACH physical RACH
  • the base station can know that the terminal has selected a certain block from each of the SS/PBCH blocks and monitors the related control region #0.
  • DCI downlink control information
  • Scheduling information for uplink data (or physical uplink shared channel, PUSCH) or downlink data (or physical downlink shared channel, PDSCH) in the 5G system is through DCI transmitted from the base station to the terminal.
  • the UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH.
  • the DCI format for countermeasures may be composed of a fixed field predetermined between the base station and the terminal, and the DCI format for non-prevention may include a configurable field.
  • there are various formats of DCI and according to each format, whether DCI for power control or DCI for notifying a slot format indicator (SFI), etc. may be indicated.
  • SFI slot format indicator
  • DCI may be transmitted through a PDCCH, which is a physical downlink control channel, through channel coding and modulation.
  • a cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC may be scrambled with a radio network temporary identifier (RNTI) corresponding to the identity of the UE.
  • RNTI radio network temporary identifier
  • Different RNTIs may be used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, the RNTI is not explicitly transmitted, but is transmitted while being included in the CRC calculation process.
  • the UE Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI. If the CRC check result is correct, the UE can know that the message has been transmitted to the UE.
  • the PDCCH is mapped and transmitted in a control resource set (CORESET) configured for the UE.
  • DCI scheduling PDSCH for system information may be scrambled with SI-RNTI.
  • DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with an RA-RNTI.
  • DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI.
  • DCI notifying a slot format indicator (SFI) may be scrambled with an SFI-RNTI.
  • DCI notifying transmit power control (TPC) may be scrambled with TPC-RNTI.
  • DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).
  • the XOR operation may be a modulo-2 operation. If the number of bits of the CRC of DCI and the number of bits of the RNTI are different, it may be possible to perform an operation with an LSB or MSB of a long number of bits. For example, when the CRC of the DCI is 24 bits and the RNTI is 16 bits, the RNTI may be scrambled to the LSB 16 bits of the CRC.
  • DCI format 0_0 may be used as a DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI.
  • DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • DCI format 0_1 may be used as non-preparation DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI.
  • DCI format 0_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • DCI format 1_0 may be used as a DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI.
  • DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • DCI format 1_1 may be used as non-preparation DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI.
  • DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.
  • the base station may set a table for time domain resource allocation information for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) to higher layer signaling (eg, RRC signaling) to the terminal.
  • PDSCH downlink data channel
  • PUSCH uplink data channel
  • the time domain resource allocation information includes, for example, the PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted by K0) or PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted by K2), the PDSCH or PUSCH is scheduled in the slot Information on the position and length of the start symbol, a mapping type of PDSCH or PUSCH, etc. may be included. For example, information as shown in Tables 9 and 10 below may be notified from the base station to the terminal.
  • the base station may notify the terminal of one of the entries in the table for the time domain resource allocation information through L1 signaling (eg, DCI) to the terminal (eg, indicated by the 'time domain resource allocation' field in DCI) can).
  • the terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.
  • FIG. 2 is a diagram illustrating an example of a control region in which a downlink control channel is transmitted in a 5G wireless communication system.
  • 2 shows two control regions (control region #1 (201), control region #2 (202)) in one slot 220 on the time axis and in the UE bandwidth part 210 on the frequency axis.
  • the control regions 201 and 202 may be set in a specific frequency resource 203 within the entire terminal bandwidth portion 210 on the frequency axis.
  • As a time axis one or a plurality of OFDM symbols may be set, and this may be defined as a control region length (Control Resource Set Duration, 204).
  • the control region #1 201 is set to a control region length of 2 symbols
  • the control region #2 202 is set to a control region length of 1 symbol.
  • the above-described control region in 5G may be set by the base station to the terminal through higher layer signaling (eg, system information, MIB, RRC signaling).
  • Setting the control region to the terminal means providing information such as a control region identifier (Identity), a frequency position of the control region, and a symbol length of the control region.
  • the higher layer signaling may include information of Table 11 below.
  • tci-StatesPDCCH (simply referred to as transmission configuration indication (TCI) state) configuration information is one or more SS/PBCH block indexes or CSI-RS ( channel state information reference signal) index information.
  • TCI transmission configuration indication
  • each control information included in DCI format 1_1, which is scheduling control information (DL grant) for downlink data may be as follows.
  • Carrier indicator indicates on which carrier the data scheduled by DCI is transmitted - 0 or 3 bits
  • - Identifier for DCI formats Indicates the DCI format, and specifically, it is an indicator for distinguishing whether the corresponding DCI is for downlink or uplink. - [1] bits
  • Bandwidth part indicator Indicate if there is a change in the bandwidth part - 0, 1 or 2 bits
  • Frequency domain resource assignment This is resource allocation information indicating frequency domain resource allocation, and the resource expressed varies depending on whether the resource allocation type is 0 or 1.
  • Time domain resource assignment As resource assignment information indicating time domain resource assignment, one setting of upper layer signaling or a predetermined PDSCH time domain resource assignment list may be indicated -1, 2, 3, or 4 bits
  • VRB-to-PRB mapping indicates a mapping relationship between a virtual resource block (VRB) and a physical resource block (PRB) - 0 or 1 bit
  • - PRB bundling size indicator indicates the size of the physical resource block bundling assuming that the same precoding is applied - 0 or 1 bit
  • Rate matching indicator indicates which rate match group is applied among the rate match groups set as the upper layer applied to the PDSCH - 0, 1, or 2 bits
  • - ZP CSI-RS trigger triggers the zero power channel state information reference signal - 0, 1, or 2 bits
  • Transport block (transport block, TB) related configuration information indicates a modulation and coding scheme (MCS), a new data indicator (NDI) and a redundancy version (RV) for one or two TBs.
  • MCS modulation and coding scheme
  • NDI new data indicator
  • RV redundancy version
  • MCS Modulation and coding scheme
  • New data indicator indicates whether HARQ initial transmission or retransmission.
  • Redundancy version indicates a redundancy version of HARQ.
  • - HARQ process number indicates the HARQ process number applied to the PDSCH - 4 bits
  • Downlink assignment index an index for generating a dynamic HARQ-ACK codebook when reporting HARQ-ACK for PDSCH - 0 or 2 or 4 bits
  • PUCCH resource indicator Information indicating the resource of PUCCH for HARQ-ACK report for PDSCH - 3 bits
  • - PDSCH-to-HARQ_feedback timing indicator Configuration information on which slot PUCCH for HARQ-ACK report for PDSCH is transmitted - 3 bits
  • Antenna ports information indicating the antenna port of the PDSCH DMRS and the DMRS CDM group in which the PDSCH is not transmitted - 4, 5 or 6 bits
  • Transmission configuration indication information indicating beam related information of PDSCH - 0 or 3 bits
  • CBG transmission information information indicating which code block group (CBG) data is transmitted through PDSCH when code block group-based retransmission is configured - 0, 2, 4, 6, or 8 bits
  • - CBG flushing out information Information indicating whether the code block group previously received by the terminal can be used for HARQ combining - 0 or 1 bit
  • time domain resource assignment includes information about a slot in which PDSCH/PUSCH is transmitted, and a symbol to which a start symbol position S in the corresponding slot and PDSCH/PUSCH are mapped. It can be conveyed by the number L.
  • S may be a relative position from the start of the slot
  • L may be the number of consecutive symbols
  • S and L are start and length indicator values defined as in Equation 1 below (start and length indicator value: SLIV) can be determined from
  • the UE may receive information on the SLIV value, the PDSCH/PUSCH mapping type, and the slot in which the PDSCH/PUSCH is transmitted in one row through RRC configuration (eg, the information is configured in the form of a table) can be). Thereafter, in the time domain resource allocation of the DCI, by indicating the index value in the set table, the base station can deliver the SLIV value, the PDSCH/PUSCH mapping type, and information on the slot in which the PDSCH/PUSCH is transmitted to the terminal.
  • RRC configuration eg, the information is configured in the form of a table
  • PDSCH mapping types are defined as type A (type A) and type B (type B).
  • type A the first symbol among DMRS symbols is located in the second or third OFDM symbol of the slot.
  • PDSCH mapping type B the first symbol among DMRS symbols of the first OFDM symbol in the time domain resource allocated for PUSCH transmission is located.
  • Downlink data may be transmitted on PDSCH, which is a physical channel for downlink data transmission.
  • the PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position and a modulation method in the frequency domain is determined based on DCI transmitted through the PDCCH.
  • the base station notifies the terminal of the modulation scheme applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size, transport block size (TBS)).
  • the MCS may consist of 5 bits or more or fewer bits.
  • the TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.
  • a transport block may include a medium access control (MAC) header, a MAC control element, one or more MAC service data unit (SDU), and padding bits.
  • TB may indicate a data unit or MAC protocol data unit (PDU) delivered from the MAC layer to the physical layer.
  • MAC medium access control
  • SDU MAC service data unit
  • PDU MAC protocol data unit
  • Modulation methods supported by the NR system are QPSK (quadrature phase shift keying), 16QAM (quadrature amplitude modulation), 64QAM, and 256QAM, and each modulation order (Qm) corresponds to 2, 4, 6, 8. . That is, 2 bits per symbol in the case of QPSK modulation, 4 bits per symbol in the case of 16QAM modulation, 6 bits per symbol in the case of 64QAM modulation, and 8 bits per symbol in the case of 256QAM modulation can be transmitted.
  • QPSK quadrature phase shift keying
  • 16QAM quadrature amplitude modulation
  • 64QAM quadrature amplitude modulation
  • 256QAM modulation order
  • 3 and 4 are diagrams illustrating an example in which eMBB, URLLC, and mMTC data, which are services considered in a 5G or NR system, are allocated from frequency-time resources.
  • FIG. 3 is a diagram illustrating an example in which eMBB, URLLC, and mMTC data are allocated to the entire system frequency band.
  • data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band 300 .
  • URLLC data (303, 305, 307) is generated and transmission is required while eMBB (301) and mMTC (309) are allocated in a specific frequency band and transmitted, eMBB (301) and mMTC (309) are already allocated part URLLC data 303 , 305 , and 307 may be transmitted without emptying or transmitting .
  • URLLC data may be allocated (303, 305, 307) to a part of the resource 301 to which the eMBB is allocated and transmitted.
  • the eMBB data may not be transmitted in the overlapping frequency-time resource, and thus the transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure may occur due to URLLC allocation.
  • FIG. 4 is a diagram illustrating an example in which eMBB, URLLC, and mMTC data are allocated by dividing a system frequency band.
  • the entire system frequency band 400 may be divided and used for service and data transmission in each subband 402 , 404 , and 406 .
  • Information related to the subband configuration may be predetermined, and this information may be transmitted from the base station to the terminal through higher level signaling.
  • the subband may be arbitrarily divided by a base station or a network node to provide services without transmission of additional subband configuration information to the terminal. 4 shows that subband 402 is used for eMBB data transmission, subband 404 is used for URLLC data transmission, and subband 406 is used for mMTC data transmission.
  • the terms physical channel and signal in the NR system may be used to describe the method and apparatus proposed in the embodiment.
  • the content of the present invention can be applied to a wireless communication system other than the NR system.
  • downlink is a wireless transmission path of a signal transmitted from a base station to a terminal
  • uplink uplink means a wireless transmission path of a signal transmitted from a terminal to a flag station.
  • an embodiment of the present invention will be described with an NR system as an example, but the embodiment of the present invention may be applied to other communication systems having a similar technical background or channel type.
  • the embodiments of the present invention can be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present invention as judged by a person having skilled technical knowledge.
  • the terms "physical channel” and “signal” may be used interchangeably with data or control signals.
  • the PDSCH is a physical channel through which data is transmitted, but in the present invention, the PDSCH may be referred to as data.
  • RRC signaling is a signal transmission method from the base station to the terminal using the downlink data channel of the physical layer or from the terminal to the base station using the uplink data channel of the physical layer
  • RRC signaling or MAC control element may be referred to.
  • FIG. 5 is a diagram illustrating an example of a process in which one transport block is divided into several code blocks and a CRC is added.
  • a CRC 503 may be added to the last or front part of one transport block TB 501 to be transmitted in uplink or downlink.
  • the CRC 503 may have 16 bits or 25 bits, a fixed number of bits in advance, or a variable number of bits according to channel conditions, and may be used to determine whether or not channel coding is successful.
  • a block to which the CRC 503 is added to the TB 501 may be divided into several codeblocks (CBs) 507 , 509 , 511 , and 513 ( 505 ).
  • the code block may be divided with a predetermined maximum size, and in this case, the last code block 513 may have a smaller size than the other code blocks 507 , 509 , and 511 .
  • this is only an example, and according to another example, 0, a random value, or 1 is inserted into the last code block 513 so that the last code block 513 and the other code blocks 507 , 509 and 511 have the same length. can be tailored
  • CRCs 517 , 519 , 521 , and 523 may be added to the code blocks 507 , 509 , 511 , and 513 , respectively ( 515 ).
  • the CRC may have 16 bits or 24 bits or a predetermined number of bits, and may be used to determine whether channel coding succeeds.
  • a TB 501 and a cyclic generator polynomial may be used to generate the CRC 503, and the cyclic generator polynomial may be defined in various ways.
  • cyclic generator polynomial gCRC24A(D) D24 + D23 + D18 + D17 + D14 + D11 + D10 + D7 + D6 + D5 + D4 + D3 + D + 1 for 24-bit CRC
  • L 24, TB data About, CRC Is Divide by gCRC24A(D) so that the remainder becomes 0, can be decided
  • the CRC length L has been described as an example of 24, but the CRC length L may be determined to have various lengths such as 12, 16, 24, 32, 40, 48, 64, and the like.
  • the TB+CRC may be divided into N CBs 507 , 509 , 511 , and 513 .
  • CRCs 517 , 519 , 521 , 523 may be added to each of the divided CBs 507 , 509 , 511 , and 513 ( 515 ).
  • the CRC added to the CB may have a different length than when generating the CRC added to the TB, or a different cyclic generator polynomial may be used to generate the CRC.
  • the CRC 503 added to the TB and the CRCs 517 , 519 , 521 , and 523 added to the code block may be omitted depending on the type of channel code to be applied to the code block. For example, when an LDPC code, not a turbo code, is applied to a code block, CRCs 517 , 519 , 521 , and 523 to be inserted for each code block may be omitted.
  • the CRCs 517 , 519 , 521 , and 523 may be added to the code block as it is. Also, even when a polar code is used, a CRC may be added or omitted.
  • the maximum length of one code block is determined for a TB to be transmitted according to the type of channel coding applied, and the TB and CRC added to TB according to the maximum length of the code block are converted into code blocks. Partitioning may be performed.
  • CRC for CB is added to the divided CB, and the data bits and CRC of the CB are encoded with a channel code, coded bits are determined, and each coded bit is promised in advance. As described above, the number of rate-matched bits was determined.
  • the size of TB (TBS) in the NR system can be calculated through the following steps.
  • Step 1 The number of REs allocated to PDSCH mapping in one PRB in the allocated resource. to calculate
  • Is can be calculated as From here, is 12, may indicate the number of OFDM symbols allocated to the PDSCH. is the number of REs in one PRB occupied by DMRSs of the same CDM group. is the number of REs occupied by an overhead in a PRB as long as it is set by higher-order signaling, and may be set to one of 0, 6, 12, and 18. Thereafter, the total number of REs allocated to the PDSCH N RE may be calculated. N RE is , where n PRB represents the number of PRBs allocated to the UE.
  • Step 2 Number of temporary information bits N info is can be calculated as
  • R is a code rate
  • Qm is a modulation order
  • information on this value may be transmitted using an MCS bitfield of DCI and a predefined table.
  • v is the number of allocated layers.
  • Step 3 Wow through the formula of can be calculated.
  • TBS is shown in Table 12 below. of values not less than can be determined as the closest value to .
  • Step 4 Wow through the formula of can be calculated.
  • TBS It can be determined through the value and the following [pseudo-code 1].
  • C corresponds to the number of code blocks included in one TB.
  • parity bits may be added and output.
  • the amount of parity bits may vary according to an LDCP base graph.
  • a method of sending all parity bits generated by LDPC coding to a specific input is called full buffer rate matching (FBRM), and a method of limiting the number of transmitable parity bits is called LBRM (limited buffer rate matching). can do.
  • FBRM full buffer rate matching
  • LBRM limited buffer rate matching
  • N cb N.
  • N cb min (N, N ref ), and N ref is is given, and R LBRM may be determined to be 2/3.
  • TBS LBRM the above-described method of obtaining TBS is used, assuming the maximum number of layers and maximum modulation order supported by the UE in the cell, and the maximum modulation order Qm supports 256QAM for at least one BWP in the cell. 8 when it is set to use the MCS table of , and n PRB is calculated assuming n PRB,LBRM .
  • n PRB, LBRM may be given in Table 13 below.
  • the maximum data rate supported by the UE in the NR system may be determined through Equation 2 below.
  • R max 948/1024
  • ⁇ may mean a subcarrier spacing.
  • Is can be calculated as is the maximum number of RBs in BW(j).
  • OH (j) is an overhead value, and may be given as 0.14 in downlink of FR1 (band below 6 GHz) and 0.18 in uplink, and 0.08 in downlink of FR2 (band above 6 GHz) and 0.10 in uplink can be given Through Equation 2, the maximum data rate in downlink in a cell having a 100 MHz frequency bandwidth at a 30 kHz subcarrier interval can be calculated from Table 15 below.
  • the actual data rate that the terminal can measure in actual data transmission may be a value obtained by dividing the amount of data by the data transmission time. This may be a value obtained by dividing the sum of TBS by the TTI length in the case of 1 TB transmission or TBS in 2 TB transmission.
  • the maximum actual data rate in the downlink in a cell having a 100 MHz frequency bandwidth at a 30 kHz subcarrier interval may be determined as shown in Table 16 below according to the number of allocated PDSCH symbols.
  • the maximum data rate supported by the terminal can be checked through Table 7, and the actual data rate according to the allocated TBS can be checked through Table 8. In this case, there may be a case where the actual data rate is greater than the maximum data rate according to the scheduling information.
  • a data rate that the terminal can support may be mutually agreed upon between the base station and the terminal. This may be calculated using the maximum frequency band supported by the terminal, the maximum modulation order, the maximum number of layers, and the like. However, the calculated data rate may be different from a value calculated from a transport block size (TBS) and a transmission time interval (TTI) length used for actual data transmission.
  • TBS transport block size
  • TTI transmission time interval
  • the terminal may be allocated a TBS larger than the value corresponding to the data rate supported by the terminal. To prevent this, there may be restrictions on the TBS that can be scheduled according to the data rate supported by the terminal.
  • FIG. 6 is a diagram illustrating a state in which a synchronization signal (SS) and a physical broadcast channel (PBCH) of an NR system are mapped in the frequency and time domains.
  • SS synchronization signal
  • PBCH physical broadcast channel
  • a primary synchronization signal (PSS, 601), a secondary synchronization signal (SSS, 603), and a PBCH are mapped over 4 OFDM symbols, the PSS and SSS are mapped to 12 RBs, and the PBCH is It is mapped to 20 RBs. How the frequency band of 20 RBs changes according to subcarrier spacing (SCS) is shown in the table of FIG. 6 .
  • the resource region in which the PSS, SSS, and PBCH are transmitted may be referred to as an SS/PBCH block (SS/PBCH block).
  • the SS/PBCH block may be referred to as an SSB block.
  • FIG. 7 is a diagram illustrating symbols in which SS/PBCH blocks can be transmitted according to subcarrier intervals.
  • the subcarrier interval may be set to 15 kHz, 30 kHz, 120 kHz, 240 kHz, etc., and the position of the symbol in which the SS/PBCH block (or SSB block) may be located may be determined according to each subcarrier interval.
  • FIG. 7 shows the positions of symbols at which SSB can be transmitted according to subcarrier spacing in symbols within 1 ms, and the SSB is not always transmitted in the area shown in FIG. 7 .
  • the location at which the SSB block is transmitted may be configured in the terminal through system information or dedicated signaling.
  • the propagation delay time is a value obtained by dividing a path through which radio waves are transmitted from the terminal to the base station by the speed of light, and may generally be a value obtained by dividing the distance from the terminal to the base station by the speed of light.
  • a signal transmitted from the terminal is received by the base station after about 0.34 msec.
  • the signal transmitted from the base station is also received by the terminal after about 0.34 msec.
  • the arrival time of a signal transmitted from the terminal to the base station may vary depending on the distance between the terminal and the base station.
  • timing advance when multiple terminals located in different locations transmit signals at the same time, arrival times at the base station may all be different. In order to solve this problem and allow signals transmitted from multiple terminals to arrive at the base station at the same time, the time for transmitting the uplink signal may be different for each terminal according to the location. In 5G, NR and LTE systems, this is referred to as timing advance.
  • FIG. 8 is a diagram illustrating a processing time of a terminal according to a timing advance when the terminal receives a first signal and the terminal transmits a second signal corresponding thereto in the 5G or NR system according to the disclosed embodiment.
  • the terminal When the base station transmits an uplink scheduling grant (UL grant) or a downlink control signal and data (DL grant and DL data) to the terminal in slot n (802), the terminal grants uplink scheduling grant or downlink in slot n (804) It can receive link control signals and data. In this case, the terminal may receive the signal later by the transmission delay time (Tp, 810) than the time the base station transmits the signal. In this embodiment, when the terminal receives the first signal in slot n (804), the terminal transmits the corresponding second signal in slot n+4 (806).
  • Tp transmission delay time
  • the terminal transmits a signal to the base station, in order to arrive at the base station at a specific time, at the timing 806 advanced by the timing advance (TA, 812) from slot n+4 of the signal reference received by the terminal, the terminal is uplinked HARQ ACK/NACK for data or downlink data may be transmitted. Therefore, in this embodiment, the time during which the terminal can prepare to receive uplink scheduling approval, transmit uplink data, or receive downlink data and transmit HARQ ACK or NACK is TA in the time corresponding to three slots It may be a time except for (814).
  • the base station may calculate the absolute value of the TA of the corresponding terminal.
  • the base station calculates the absolute value of TA by adding or subtracting the amount of change in the TA value transmitted through higher signaling after that to the TA value first delivered to the terminal in the random access step when the terminal initially accesses it. have.
  • the absolute value of the TA may be a value obtained by subtracting the start time of the nth TTI received by the UE from the start time of the nth TTI transmitted by the UE.
  • one of the important criteria for performance of a cellular wireless communication system is packet data latency.
  • signal transmission and reception is performed in units of subframes having a transmission time interval (TTI) of 1 ms.
  • TTI transmission time interval
  • the LTE system operating as described above it is possible to support a terminal (short-TTI UE) having a transmission time period shorter than 1 ms.
  • the transmission time interval may be shorter than 1 ms.
  • the Short-TTI terminal is suitable for services such as Voice over LTE (VoLTE) service and remote control where latency is important.
  • the short-TTI terminal becomes a means capable of realizing the mission-critical Internet of Things (IoT) on a cellular basis.
  • IoT mission-critical Internet of Things
  • the DCI for scheduling the PDSCH indicates the K1 value, which is a value corresponding to timing information for transmitting HARQ-ACK information of the PDSCH by the UE.
  • the terminal may transmit it to the base station. That is, HARQ-ACK information may be transmitted from the terminal to the base station at the same or later time point than the symbol L1 including timing advance.
  • the HARQ-ACK information may not be valid HARQ-ACK information in HARQ-ACK transmission from the terminal to the base station.
  • T proc,1 from the last time point of the PDSCH Thereafter, it may be the first symbol from which a cyclic prefix (CP) starts.
  • T proc,1 can be calculated as in Equation 3 below.
  • N1, d1,1, d1,2, K, ⁇ , and TC may be defined as follows.
  • the maximum timing difference between carriers may be reflected in the second signal transmission.
  • - N1 is defined as in Table 17 below according to ⁇ .
  • the terminal when the base station transmits control information including uplink scheduling grant, the terminal may indicate a K2 value corresponding to timing information for transmitting uplink data or PUSCH.
  • the UE may transmit the PUSCH to the base station. That is, the PUSCH may be transmitted from the terminal to the base station at the same or later time point than the symbol L2 including timing advance.
  • the UE may ignore the uplink scheduling grant control information from the base station.
  • T proc,2 is T proc,2 from the last time point of the PDCCH including the scheduling grant.
  • the CP of the PUSCH symbol to be transmitted later may be the first symbol that starts.
  • T proc,2 can be calculated as in Equation 4 below.
  • N2, d2,1, K, ⁇ , and TC may be defined as follows.
  • the maximum timing difference between carriers may be reflected in the second signal transmission.
  • - N2 is defined as in Table 18 below according to ⁇ .
  • the 5G or NR system may set a frequency band part (BWP) in one carrier to designate that a specific terminal transmits and receives within the set BWP. This may be aimed at reducing power consumption of the terminal.
  • the base station may set a plurality of BWPs, and may change the BWP activated in the control information. When the BWP is changed, the time that the terminal can use may be defined as shown in Table 19 below.
  • frequency range 1 means a frequency band of 6 GHz or less
  • frequency range 2 means a frequency band of 6 GHz or more.
  • type 1 and type 2 may be determined according to UE capability. Scenarios 1,2,3,4 in the above-described embodiment are given as shown in Table 20 below.
  • FIG. 9 is a diagram illustrating an example of scheduling and transmitting data (eg, TBs) according to slots, receiving HARQ-ACK feedback for the corresponding data, and performing retransmission according to the feedback.
  • TB1 900 is initially transmitted in slot 0 902 , and ACK/NACK feedback 904 for this is transmitted in slot 4 906 . If the initial transmission of TB1 fails and a NACK is received, retransmission 910 for TB1 may be performed in slot 8 908 .
  • the time point at which the ACK/NACK feedback is transmitted and the time point at which the retransmission is performed may be predetermined or may be determined according to a value indicated by control information and/or higher layer signaling.
  • HARQ process IDs 0 to 7 may be assigned to and transmitted from TB1 to TB8. If the number of HARQ process IDs usable by the base station and the terminal is only 4, it may not be possible to continuously transmit 8 different TBs.
  • one terminal transmitting the same data to a plurality of terminals or a base station transmitting the same data to a plurality of terminals will be referred to as groupcast or multicast, It should be noted that groupcast and multicast may be used interchangeably in various embodiments of the present disclosure.
  • the term “base station (BS)” refers to a transmission point (TP), a transmit-receive point (TRP), based on the type of a wireless communication system.
  • Wireless such as enhanced node B (eNodeB or eNB), 5G base station (gNB), macrocell, femtocell, WiFi access point (AP), or other wireless enabled devices It may represent any component (or set of components) that is configured to provide access.
  • Base stations may use one or more radio protocols, for example 5G 3GPP new air interface/access (NR), long term evolution (LTE), LTE advanced (LTE-A), high-speed packet access (high speed packet access (HSPA), wireless access according to Wi-Fi 802.11a/b/g/n/ac, etc. may be provided.
  • 5G 3GPP new air interface/access NR
  • LTE long term evolution
  • LTE advanced LTE advanced
  • HSPA high-speed packet access
  • Wi-Fi 802.11a/b/g/n/ac wireless access according to Wi-Fi 802.11a/b/g/n/ac, etc.
  • terminal refers to "user equipment (UE),” “mobile station”, “subscriber station”, “remote terminal”, It may represent any component, such as a “wireless terminal,” “receive point, or “user device”.
  • UE user equipment
  • mobile station mobile station
  • subscriber station subscriber station
  • remote terminal It may represent any component, such as a “wireless terminal,” “receive point, or “user device”.
  • the term “terminal” is used in the present disclosure regardless of whether the terminal is to be considered a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or vending machine, for example). Used to indicate a device accessing a base station in various embodiments.
  • FIG. 10 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure.
  • the base station 1001 transmits the same control information and the same data to a plurality of terminals, for example, the terminals 1003 , 1005 , 1007 , and 1011
  • SIB system information block
  • the base station provides a system information block (SIB, hereinafter referred to as "SIB") to the terminals 1003, 1005, 1007, and 1011, or preset information, or preset It informs the G-RNTI that can be used to receive control information for groupcast through a message or the like.
  • SIB system information block
  • the G-RNTI is a group radio network temporary identifier (G-RNTI, hereinafter referred to as "G-RNTI").
  • Each of the terminals 1003 , 1005 , 1007 , and 1011 may receive the G1-RNTI transmitted from the base station 1001 and receive control information for groupcast using the G-RNTI.
  • the G-RNTI includes a cyclic redundancy check (CRC) of control information for groupcast, for example, downlink control information (DCI, hereinafter referred to as “DCI”). ) may be scrambled and transmitted.
  • CRC cyclic redundancy check
  • a terminal 1009 may be a terminal accessing the base station 1001 , and a cell radio network temporary identifier (C-RNTI, hereinafter “C-RNTI”) from the base station 1001 .
  • C-RNTI cell radio network temporary identifier
  • the terminal 1011 may be a terminal accessing the base station 1001 , and may be a terminal that has received a C-RNTI from the base station 100 and also received a G-RNTI for groupcast.
  • the same control information and data when the same control information and data are transmitted and one or a plurality of terminals can receive the transmitted, the same control information and data, this may be referred to as a groupcast for the control information and data.
  • a C-RNTI or a terminal-specific RNTI is received, and only certain terminals receive control information and data using the C-RNTI or a terminal-specific RNTI. If received, it may be referred to as unicast for the control information and data.
  • the terminal may be configured to receive a control channel signal and a data channel signal for groupcast from the transmitter A, and receive a control channel signal and a data channel signal for unicast from the transmitter B.
  • the transmitter A and the transmitter B may be the same transmitter or different transmitters.
  • each of the transmitting end A and the transmitting end B may be a base station, or may be a vehicle or a general terminal.
  • groupcast data and unicast data may be transmitted from the base station, that is, transmitted through a Uu link.
  • each of the transmitter A and the transmitter B when each of the transmitter A and the transmitter B is a vehicle or a general terminal, the groupcast transmission and the unicast transmission may be sidelink transmissions.
  • each of the transmitting end A and the transmitting end B may be a terminal operating as a leader node or an anchor node in the corresponding group, and therefore, each of the transmitting end A and the transmitting end B is at least one It may be a terminal capable of performing groupcast transmission to another terminal and receiving control information from the at least one other terminal.
  • the transmitter A may be a vehicle
  • the transmitter B may be a base station.
  • the UE receives an RNTI (in the following description, for the group cast) corresponding to a unique identifier (ID, hereinafter referred to as “ID”) for receiving the control channel signal and the data channel signal for the group cast.
  • ID a unique identifier
  • the RNTI corresponding to the unique ID for receiving the control channel signal and the data channel signal may be used interchangeably with G-RNTI, group common RNTI, group identifier, etc.
  • a terminal here, another terminal in the group may be a leader node.
  • the terminal may receive a control channel signal for groupcast using the G-RNTI, and may receive a data channel signal based on the control channel signal for groupcast.
  • control channel for data scheduling is a physical downlink control channel (PDCCH: physical downlink control channel, hereinafter referred to as “PDCCH”) or a physical sidelink control channel (PSCCH: physical sidelink control) channel, hereinafter referred to as "PSCCH”) may be used interchangeably, and the data channel is a physical downlink shared channel (PDSCH) or a physical sidelink shared channel (PSSCH).
  • PDCCH physical downlink control channel
  • PSCCH physical sidelink control channel
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink shared channel
  • PUCCH physical uplink control channel
  • PSCCH physical uplink control channel
  • DCI control information for scheduling received by the terminal
  • the control information for the scheduling may be implemented in various forms other than the DCI. to be.
  • one terminal transmitting the same data to a plurality of terminals or a base station transmitting the same data to a plurality of terminals may be referred to as groupcast or multicast. It should be noted that in various embodiments of the present disclosure, groupcast may be used in combination with multicast.
  • data may include a transport block (TB) transmitted through a shared channel such as PDSCH, PUSCH, PSSCH, and the like.
  • TB transport block
  • signal transmission/reception schemes for groupcast or multicast according to the following three embodiments are proposed, which will be described in detail as follows.
  • the terminals when data for groupcast is transmitted to terminals, the terminals provide hybrid automatic repeat request (HARQ, hereinafter referred to as "HARQ") feedback information (for example, , HARQ-acknowledgement: HARQ-ACK, hereinafter referred to as "HARQ-ACK”))) to a base station or a transmitter, and a method and apparatus are proposed.
  • HARQ hybrid automatic repeat request
  • HARQ-ACK HARQ-acknowledgement
  • HARQ-ACK HARQ-ACK
  • the base station may provide, for example, an RNTI that can be used to receive control information for groupcast to the terminals through the SIB.
  • a plurality of RNTIs may be provided through the SIB, and each of the plurality of RNTIs may have a different purpose.
  • the arbitrary RNTI may be for an RNTI for a specific broadcast or may be an RNTI for a specific emergency. In this case, the value may be set differently.
  • the base station is a radio resource control (RRC, hereinafter referred to as “RRC") or medium access control (MAC, hereinafter referred to as “MAC”) control element (radio resource control: hereinafter referred to as “MAC”) control element :
  • RRC radio resource control
  • MAC medium access control
  • the RNTI for groupcast may be set to specific UEs through higher layer signaling such as CE (hereinafter referred to as "CE"). Setting the RNTI for groupcast to specific UEs through higher layer signaling in this way may be to transmit data for groupcast only to UEs in RRC-connected (RRC_connected, hereinafter referred to as “RRC_connected”) mode.
  • RRC_connected mode may mean a state in which the terminal receives the C-RNTI from the base station and accesses the base station after completing the initial access procedure and the random access procedure.
  • the base station may receive feedback information on control information and data for groupcast from UEs in RRC_connected mode.
  • HARQ feedback information based on distance or received energy for example, reference signal received power (RSRP, hereinafter referred to as “RSRP”), etc. can be transmitted/received.
  • RSRP reference signal received power
  • FIG. 11 is a diagram schematically illustrating another example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure.
  • a base station 1101 may provide data for groupcast to a plurality of terminals 1103 , 1105 , 1107 , 1109 , 1121 , 1123 , 1125 , 1131 , and 1133 .
  • Each of the terminals 1103, 1105, 1107, 1109, 1121, 1123, 1125, 1131, and 1133 is a terminal in RRC_connected mode or a terminal in RRC_inactive (RRC_inactive, hereinafter referred to as "RRC_inactive") mode. or RRC_idle (RRC_idle, hereinafter referred to as “RRC_idle”) mode.
  • the terminal may transmit HARQ feedback information or uplink data to the base station based on a distance or received energy, for example, RSRP, etc. during transmission/reception of downlink or uplink data.
  • the base station 1101 may transmit information indicating the reference location 1111 to the terminal through higher layer signaling or SIB signaling.
  • the base station 1111 may transmit information indicating the reference location 1111 through control information for groupcast, for example, DCI.
  • the reference position 1111 may be expressed as, for example, coordinate information, and of course, it may be expressed in any form that can represent the reference position 1111 .
  • a threshold may be included in the DCI for the groupcast, and the threshold may be used to compare with a distance or received energy for determining whether the UE transmits HARQ feedback information.
  • the threshold value may be set, for example, based on a separation distance from the reference position, for example, the threshold value is d1 or It can be set to d2.
  • d1 may indicate that terminals existing at a distance less than d1 from the reference location 1111 should transmit HARQ feedback information
  • d2 is a distance less than d2 from the reference location 1111. It may indicate that existing terminals should transmit HARQ feedback information.
  • d1 may indicate that terminals existing at a distance of d1 or more from the reference location 1111 should transmit HARQ feedback information
  • d2 is located at a distance of d2 or more from the reference location 1111. It may indicate that the terminals need to transmit HARQ feedback information.
  • the d1 indicates that terminals existing at a distance less than d1 from the reference location 1111 can transmit the uplink data.
  • the d2 may indicate that terminals existing at a distance less than d2 from the reference location 1111 may transmit uplink data.
  • the d1 may indicate that terminals existing at a distance of d1 or more from the reference location 1111 can transmit uplink data
  • the d2 is a distance of d2 or more from the reference location 1111. It may indicate that existing terminals are capable of transmitting uplink data.
  • the position spaced apart from the reference position 1111 by d1 is, for example, the position 1113
  • the position spaced apart from the reference position 1111 by d2 is, for example, the position 1115 .
  • a method for the terminal to detect the location of the terminal may be implemented in various forms, and a detailed description thereof will be omitted.
  • determining whether to transmit HARQ feedback information or uplink data based on distance is described as an example, but not only the HARQ feedback information or uplink data but also a scheduling request (SR, hereinafter) Whether to transmit various uplink signals such as “SR”) or buffer status report (BSR: buffer status report, hereinafter referred to as "BSR”) also determines whether HARQ feedback information or uplink data is transmitted. It may be determined in a manner similar to the method of judging.
  • SR scheduling request
  • BSR buffer status report
  • downlink control information for example, DCI may include at least one of the following bit fields.
  • the receiver may include reference location information indicating a location for identifying whether to transmit HARQ feedback information or uplink data using a distance or received energy, for example, RSRP.
  • reference location information indicating a location for identifying whether to transmit HARQ feedback information or uplink data using a distance or received energy, for example, RSRP.
  • location information corresponding to the reference location 1111 may be included.
  • Threshold distance (threshold value) field information indicating a threshold distance value (threshold value) to be compared with a distance calculated by the receiver using the receiver's own location information and the reference location information.
  • the threshold distance field may include, for example, a distance value such as 100 m or 1 km.
  • the threshold distance value included in the threshold distance field may include one of distance values transmitted through higher layer signaling or SIB.
  • Inner/outer indicator field the receiver compares the distance calculated using the receiver's own location information and reference location information with the indicated threshold distance, and HARQ feedback information based on the comparison result Alternatively, when transmitting uplink data, etc., when the distance calculated using the receiver's own location information and the reference location information is greater than or equal to the threshold distance value, transmission of HARQ feedback information or uplink data, etc.
  • An indicator indicating whether to perform HARQ feedback information or uplink data transmission when the distance calculated by the receiver using the receiver's own location information and the reference location information is less than the threshold distance may include
  • the internal/external indicator field includes an internal indicator (hereinafter, referred to as an "inner indicator”) value
  • the internal/external indicator field includes an external indicator (hereinafter, referred to as an "outer indicator") value
  • only terminals located at a distance greater than or equal to the threshold distance from the reference position are HARQ feedback information or up Link data may be transmitted.
  • the terminal when transmitting data for groupcast to terminals, the terminal provides a method and apparatus for transmitting HARQ feedback information to a base station or a transmitter was explained about.
  • the second embodiment of the signal transmission/reception methods for groupcast or multicast is for transmitting data for groupcast to terminals, when the terminals are RRC_connected terminals, for unicast or broadcast
  • a method and an apparatus for when data is received together with data for groupcast which data to receive and how to transmit HARQ feedback information for the received data.
  • data for groupcast will be referred to as “groupcast data”
  • data for unicast will be referred to as "unicast data”.
  • control information for groupcast will be referred to as "groupcast control information”
  • control information for unicast will be referred to as "unicast control information”.
  • prioritizing reception of specific data may mean decoding the specific data and not decoding data other than the specific data.
  • decoding the data may include demodulating the data and storing the calculated log likelihood ratio (LLR, hereinafter referred to as “LLR”) value in a soft buffer.
  • LLR log likelihood ratio
  • decoding the data includes transmitting HARQ feedback information for the data, not transmitting HARQ feedback information for data other than the data, or feeding back an arbitrary value for data other than the data. can do.
  • groupcast data and unicast data may be classified according to a bit field of the DCI or an RNTI value scrambled to the CRC of the DCI.
  • processing of groupcast data and unicast data is described as an example, but this may be similarly applied to processing of groupcast control information and unicast control information.
  • unicast data When groupcast data and unicast data are simultaneously received by the terminal, unicast data may always be given priority over the groupcast data. The reason is that, according to the scheduling of the base station, simultaneous transmission of unicast data and groupcast data may mean that there is important information to be transmitted to the terminal that will receive the unicast data. If unicast data is not given priority, there is no reason for the base station to transmit unicast, so that the case of simultaneously transmitting unicast data and groupcast data may not occur.
  • the groupcast data may always be given priority over the unicast data.
  • it may be transmission of an emergency message in which processing of groupcast data is prioritized.
  • the terminal When the terminal receives groupcast data and unicast data at the same time, it is possible to set, for example, which one of the groupcast data and the unicast data is prioritized through higher layer signaling.
  • an indicator indicating a quality of service (QoS) value or a priority value may be included in DCI for groupcast, and a threshold value for QoS or a threshold value for priority is a higher layer It may be set through signaling.
  • QoS indicator an indicator indicating a QoS value
  • priority indicator an indicator indicating a priority value
  • the threshold for the QoS value will be referred to as a "QoS threshold”
  • the threshold for the priority will be referred to as a "priority threshold”.
  • the terminal receiving the group cast data and the unicast data simultaneously compares the QoS threshold value with the QoS value indicated by the QoS indicator included in DCI for group cast, and based on the comparison result, the group You can decide whether to process cast data first.
  • both DCI for groupcast and DCI for unicast may include a QoS indicator.
  • the QoS value indicated by the QoS indicator included in the DCI for the groupcast is compared with the QoS value indicated by the QoS indicator included in the DCI for the unicast, and based on the comparison result, the group It is possible to decide which of cast data or unicast data is to be processed first.
  • the terminal simultaneously receiving the group cast data and the unicast data compares the priority threshold value with the priority value indicated by the priority indicator included in DCI for group cast, and based on the comparison result It is possible to determine whether to preferentially process the groupcast data.
  • both DCI for groupcast and DCI for unicast may include a priority indicator.
  • the priority value indicated by the priority indicator included in the DCI for the groupcast is compared with the priority value indicated by the priority indicator included in the DCI for the unicast, and the result of the comparison is compared. Based on the above, it is possible to determine which of the group cast data and the unicast data is to be processed first.
  • SPS semi-persistent scheduling
  • CG configured grant
  • dynamic scheduling means that whenever data is transmitted, transmission resource, transmission time, modulation and coding scheme (MCS, hereinafter referred to as "MCS") through DCI; It may be a scheduled mode by providing information such as a HARQ process ID (HARQ process ID).
  • MCS modulation and coding scheme
  • CG scheduling is performed on unicast data
  • unicast data is transmitted based on the CG scheduling
  • dynamic scheduling is performed on groupcast data at the same time
  • groupcast is performed through DCI based on the dynamic scheduling.
  • the terminal may simultaneously receive unicast data on which CG scheduling is performed and groupcast data on which dynamic scheduling is performed. In this case, it is possible for the terminal to prioritize dynamic scheduling over CG scheduling to preferentially process groupcast data on which the dynamic scheduling is performed.
  • CG scheduling is performed on groupcast data
  • groupcast data is transmitted based on the CG scheduling
  • dynamic scheduling is performed on unicast data at the same time, and unicast through DCI based on the dynamic scheduling.
  • the terminal may simultaneously receive groupcast data on which CG scheduling is performed and unicast data on which dynamic scheduling is performed. In this case, it is possible for the terminal to prioritize dynamic scheduling over CG scheduling to preferentially process unicast data on which the dynamic scheduling is performed.
  • method A6 may be a method of processing HARQ feedback information to be transmitted first.
  • the QoS value or priority value to be applied in the embodiments of the present disclosure is, for example, a 5G QoS identifier (5G QoS Identifier: 5QI, hereinafter referred to as “5QI”) in a 5G system.
  • 5QI 5G QoS Identifier
  • One 5QI value includes a resource type, a default priority level, a packet delay budget, a packet error rate, and a default maximum data burst volume. volume), a default averaging window, etc. may be mapped, and may be defined as shown in Table 21 below.
  • 5QI value 82 has a resource type of Delay Critical Guaranteed Bit Rate (GBR), a default priority level of 19, a packet delay budget of 10 ms, and a packet error rate of 10 -4 . , it can be seen that the default maximum data burst volume is mapped to parameters such as 255 bytes.
  • GRR Delay Critical Guaranteed Bit Rate
  • BWP carrier or bandwidth part
  • data that can be transmitted and received in a corresponding carrier or bandwidth part is A set of possible 5QI values may be set together.
  • BWP carrier or bandwidth part
  • the terminal transmitting control information, for example DCI, in the corresponding BWP may include a 5QI field in the DCI.
  • the terminal may receive configuration information for setting the 5QI value that data corresponding to the BWP configuration may have. Meanwhile, the base station may determine the size of the 5QI indication field included in the DCI transmitted in the corresponding BWP.
  • the 5QI indication field is It should be noted that various embodiments of the present disclosure are not necessarily limited thereto.
  • the base station may transmit DCI including 5QI information based on the determined size of the 5QI indication field.
  • the UE receiving the DCI interprets the 5QI indicator field included in the DCI, and thus may identify 5QI information applied to data scheduled through the DCI.
  • the terminal may perform a specific operation based on the distance between the transceivers or the distance from the reference position and the required communication distance condition of the transmitted and received data while performing control information and data transmission and reception. will be.
  • the base station in transmission/reception of groupcast data, includes reference location information (eg, an ID value of a zone at a specific location) in DCI, which is control information, and also includes HARQ feedback information.
  • a reference distance value eg, a reference zone ID, a reference distance, or a distance threshold serving as a transmission standard may be included in the DCI and transmitted.
  • the terminal receiving the groupcast data decodes and receives the DCI transmitted from the base station, and identifies the reference location information included in the DCI and a distance distance value that is a reference for transmission of the HARQ feedback information.
  • the terminal that has received the DCI (here, it should be noted that the terminal may be used interchangeably with the receiver) is the terminal based on the identified reference location information, the reference distance value, and the terminal's own location information. Whether to transmit HARQ feedback information to this transmitter, that is, the base station may be determined.
  • the terminal does not transmit the HARQ feedback information.
  • the terminal transmits HARQ feedback information for the groupcast data do.
  • the reference position may be a position of a specific transmitter or may be a position of the base station.
  • the reference distance value may be described in the form of a range value as follows.
  • the distance value may be one of parameters indicating the quality of service through the corresponding link, that is, QoS.
  • the distance value which may be one of the parameters indicating the QoS, may be interpreted as requiring a specific service to be performed or a specific type of data to be transmitted up to the corresponding distance value.
  • the distance value may be a criterion for the transmitter and the receiver to process a data packet.
  • the unit of the distance value may be, for example, a meter, and the transmitter and the receiver may receive maximum distance value information indicating the maximum distance value. This may mean that the terminal does not transmit/receive data having a distance value exceeding the maximum distance value indicated by the maximum distance value information as a QoS parameter according to the received maximum distance value information.
  • the distance value is not limited to the above description and may be applied in various ways.
  • the reference distance value used to determine whether to transmit the HARQ feedback information may be determined according to data transmitted through the PDSCH, and the reference distance value may be a value transmitted together when the data is transmitted from a higher layer. have.
  • the reference distance value may be transmitted by being included in DCI for scheduling the PDSCH by the base station. That is, the PDSCH through which the data is transmitted may be scheduled through DCI including a reference distance value for data transmitted from the base station.
  • the reference distance value may be indicated by the DCI in such a way that information directly indicating the reference distance value is included in the DCI, or an index indicating the reference distance value is included in the DCI.
  • any one of a total of n + 1 index values up to 0, ... , n may be included in the DCI, and the index value k is a specific reference distance value (eg, 100m) or a specific reference distance value.
  • a range (for example, a range of 100 m to 149 m) may be indicated.
  • an index value indicating a zone ID of a zone indicating a specific area may be included in the DCI as information indicating the reference distance value.
  • data transmitted through the PDSCH may be transmitted in a TB form from a higher layer.
  • One TB or two TBs may be transmitted in one PDSCH.
  • one TB may include various types of data. If multiple types of data having different reference distance values are included in one TB, it is necessary to determine which reference distance value among the other reference distance values is to be included in DCI as a representative reference distance value.
  • a representative reference distance value to be included in DCI is determined based on any one of the following methods.
  • the first method is a method of determining a maximum value or a minimum value among reference distance values for various types of data included in one TB as a representative reference distance value to be included in DCI.
  • a reference distance value having a maximum value among reference distance values for various types of data may be included in DCI as a representative reference distance value.
  • the representative reference distance value may be included in a range value field included in the DCI. In this case, the distance value field may be described as shown in Table 22 below.
  • the reference distance value having the maximum value among the reference distance values for various types of data included in the one TB is determined as the representative reference distance value, the data that needs to be transmitted farthest from the reference location can be transmitted. It could be to make it happen.
  • a reference distance value having a minimum value among reference distance values for various types of data included in the one TB may be included in DCI as a representative reference distance value.
  • the distance value field is shown in Table 23 below can be described together.
  • any one of the reference distance values for the various types of data may be included in DCI as the representative reference distance value according to circumstances, or a pair of the maximum value and the minimum value may be the representative reference distance It can be included in DCI as a value.
  • the representative reference distance value included in the Range Value field may be variously selected according to circumstances, for example, groupcast or It goes without saying that increasing the efficiency for multicast can be based in any possible way.
  • a reference distance value included in the distance value field has been described using a case in which one TB is transmitted in the PDSCH as an example, but a similar method may also be applied when two TBs are transmitted in the PDSCH.
  • a reference distance value having a maximum value among reference distance values of various types of data included in two TBs may be included in the Range Value field of DCI, which will be described as shown in Table 24 below.
  • the SCI having a minimum value among reference distance values for various types of data included in the two TBs may be included in the SCI.
  • a reference distance value having a minimum value among reference distance values for various types of data included in the one TB may be included in DCI as a representative reference distance value.
  • the distance value field is shown in Table 25 below can be described together.
  • a reference distance value having a maximum value or a minimum value among reference distance values for various types of data included in two TBs is included in DCI as a representative reference distance value, but the maximum value or In addition to the minimum value, any one of the reference distance values for the various types of data may be included in DCI as the representative reference distance value according to circumstances, or a pair of the maximum value and the minimum value may be the representative reference distance It can be included in DCI as a value.
  • the representative reference distance value included in the Range Value field may be variously selected according to circumstances, for example, groupcast Or, of course, it could be based on any possible way to increase the efficiency for multicast.
  • a criterion for selecting a representative reference distance value from among a plurality of reference distance values is set, any one of a plurality of reference distance values is selected based on the set criterion, and the selected reference distance value may be included in DCI have.
  • a criterion for selecting a reference distance value to be included in the Range Value field of the DCI may be set to a maximum value, a minimum value, or an average value among reference distance values for various types of data, and the transmitter Accordingly, a reference distance value to be included in the DCI may be selected.
  • the terminal when transmitting data for groupcast to terminals, the terminal provides a method and apparatus for transmitting HARQ feedback information to a base station or a transmitter was explained about.
  • the third embodiment of the signal transmission/reception methods for groupcast or multicast is based on the capability of the RRC_connected terminals when groupcast data is transmitted to the terminals, when the terminals are RRC_connected terminals.
  • a method and apparatus for receiving data according to the present invention are provided.
  • the maximum data rate supported by the UE in the NR system can be determined as follows, which has been described in detail in Equation 2, and when Equation 2 is described again, it is as follows.
  • the maximum data rate of the terminal may be compared with an actual scheduled data rate so that scheduling is not performed beyond the capability of the terminal at one time.
  • the terminal may determine the maximum data rate by calculating the maximum data rate according to the communication counterpart or by obtaining the maximum data rate based on a previously stored value. In addition, the terminal may use the determined maximum data rate for comparison with an actual instantaneous data rate. This comparison operation may be performed based on Equation 5 below.
  • Equation 5 the left side of the inequality sign indicates the instantaneous data rate of scheduled data, and the DataRateCC on the right side of the inequality sign indicates the maximum data rate in the corresponding serving cell of the terminal (which may be determined according to the capability of the terminal). .
  • a corresponding value may be used depending on whether the scheduling is scheduling for transmission and reception between the terminal and the base station, such as PDSCH or PUSCH, or scheduling for transmission and reception, such as PSSCH, between the terminal and other terminals. have.
  • Equation 5 L denotes the number of OFDM symbols allocated to the PDSCH or PSSCH, and M denotes the number of TBs transmitted in the corresponding PDSCH or PSSCH.
  • L may also include the number of symbols for automatic gain control (AGC, hereinafter referred to as "AGC" transmitted by the terminal in the sidelink.
  • AGC automatic gain control
  • Equation 5 ⁇ denotes a subcarrier interval used for PDSCH or PSSCH transmission.
  • V j,m in Equation 5 may be expressed as Equation 7 below.
  • Equation 7 A represents the size of the TB (transport block size: TBS, hereinafter referred to as "TBS"), C represents the number of code blocks (CB: code blocks) included in the TB, and C ' indicates the number of code blocks scheduled in the corresponding TB.
  • C and C' may be different.
  • Equation 7 represents the largest integer not greater than x.
  • DataRateCC indicates the maximum data rate supported by the UE in a corresponding carrier or serving cell, and may be determined as shown in Equation 5 above.
  • the maximum data rate supported by the terminal may be expressed as Equation 8 below.
  • Equation 8 is an equation showing an example of calculating the maximum data rate DataRateCC supported by the UE in the j-th serving cell.
  • Equation 8 represents the average OFDM symbol length
  • Is can be expressed as denotes the maximum number of RBs in BW(j).
  • Equation 8 represents the overhead value, which can be given as 0.14 in the downlink of FR1 (band below 6 GHz), 0.18 in the uplink of FR1, 0.08 in the downlink of FR2 (band above 6 GHz), and 0.10 in the uplink of FR2 can be given as
  • transmission of groupcast data and unicast data may be considered in the calculation operation based on Equation 5 as follows.
  • groupcast data scheduled using RNTI value for a specific groupcast for RRC_connected terminal as well as unicast data is considered for scheduling. It is to detect the instantaneous data rate of the data.
  • Calculation of the left side of Equation 5 by considering not only scheduling for unicast data but also scheduling for groupcast data scheduled using groupcast data set through higher layer signaling or HARQ process ID set through higher layer signaling how to include it in That is, in the case of the left side of Equation 5, the instantaneous data rate of scheduled data is indicated. At this time, not only unicast data but also groupcast data set through higher layer signaling or HARQ process ID set through higher layer signaling Using the HARQ process ID The instantaneous data rate of the scheduled data is detected by considering the scheduled groupcast data together.
  • FIG. 12 is a diagram schematically illustrating a structure of an example base station according to embodiments of the present disclosure.
  • the embodiment of the base station shown in FIG. 12 is for illustrative purposes only, and thus, FIG. 12 does not limit the scope of the present disclosure to any particular implementation of the base station.
  • the base station includes multiple antennas 1205a-1205n, multiple RF transceivers 1210a-1210n, transmit (TX) processing circuitry 1215, and receive ( receive: RX) processing circuitry 1220 .
  • the base station also includes a controller/processor 1225 , a memory 1230 , and a backhaul or network interface 1235 .
  • the RF transceivers 1210a-1210n receive incoming RF signals, such as signals transmitted by terminals in the network, from the antennas 1205a-1205n.
  • the RF transceivers 1210a-1210n down-convert the input RF signals to generate IF or baseband signals.
  • the IF or baseband signals are transmitted to the RX processing circuitry 1220, which filters, decodes, and/or digitizes the baseband or IF signals to generate processed baseband signals. .
  • the RX processing circuitry 1220 sends the processed baseband signals to the controller/processor 1225 for further processing.
  • the TX processing circuit 1215 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the controller/processor 1225 .
  • the TX processing circuit 1215 encodes, multiplexes, and/or digitizes the output baseband data to generate processed baseband or IF signals.
  • the RF transceivers 1210a-1210n receive the processed baseband or IF signals output from the TX processing circuit 1215 and transmit the baseband or IF signals through the antennas 1205a-1205n. up-converted to RF signals.
  • the controller/processor 1225 may include one or more processors or other processing devices that control the overall operation of the base station.
  • the controller/processor 1225 is configured to receive forward channel signals by the RF transceivers 1210a-1210n, the RX processing circuitry 1220 and the TX processing circuitry 1215 according to well-known principles. and transmission of reverse channel signals.
  • the controller/processor 1225 may support additional functions, such as more advanced wireless communication functions.
  • the controller/processor 1225 performs overall operations related to signal transmission/reception schemes for groupcast or multicast.
  • the controller/processor 1225 transmits the data for groupcast to the terminals, allowing the terminals to receive HARQ feedback information. Performs overall operations related to a method supporting transmission to a base station or transmitter.
  • the controller/processor 1225 transmits data for groupcast to terminals, when the terminals are RRC_connected terminals. , when data for unicast or broadcast is received together with data for groupcast, which data to receive and how to transmit HARQ feedback information for the received data, the overall operation related to the method carry out
  • the controller/processor 1225 transmits groupcast data to terminals, when the terminals are RRC_connected terminals, the An overall operation related to a method of receiving data is performed according to the capabilities of RRC_connected terminals.
  • controller/processor 1225 may support beamforming or directional routing operations in which signals output from multiple antennas 1205a-1205n are weighted differently to efficiently steer the output signals in a desired direction. have. Any of a variety of other functions may be supported by the controller/processor 1225 at the base station.
  • the controller/processor 1225 may also execute programs and other processes resident in the memory 1230 , such as an OS.
  • the controller/processor 1225 may move data into or out of the memory 1230 as needed by a running process.
  • the controller/processor 1225 is also coupled to the backhaul or network interface 1235 .
  • the backhaul or network interface 1235 allows the base station to communicate with other devices or systems over a backhaul connection or over a network.
  • the interface 1235 may support communications over any suitable wired or wireless connection(s).
  • the base station is implemented as a part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE-A)
  • the interface 1235 allows the base station to communicate with another via a wired or wireless backhaul connection. It may allow communication with base stations.
  • the interface 1235 allows the base station to communicate via a wired or wireless local area network or to a larger network (such as the Internet) via a wired or wireless connection. can allow you to
  • the interface 1235 includes a suitable structure to support communications through a wired or wireless connection, such as an Ethernet or RF transceiver.
  • the memory 1230 is coupled to the controller/processor 1225 .
  • a part of the memory 1230 may include a RAM, and another part of the memory 1230 may include a flash memory or other ROM.
  • FIG. 12 shows an example of a base station
  • the base station may include any number of each component shown in FIG. 12 .
  • an access point may include multiple interfaces 1235 , and the controller/processor 1225 may support routing functions to route data between different network addresses.
  • the base stations each (such as one per RF transceiver ) may contain multiple instances of
  • various components may be combined, additionally subdivided, or omitted, and additional components may be added according to special needs.
  • FIG. 13 is a diagram schematically illustrating a structure of an example terminal according to embodiments of the present disclosure.
  • FIG. 13 The embodiment of the terminal shown in FIG. 13 is for illustrative purposes only, and thus, FIG. 13 does not limit the scope of the present disclosure to any specific implementation of the terminal.
  • the terminal includes an antenna 1305 , a radio frequency (RF) transceiver 1310 , a TX processing circuit 1315 , a microphone 1320 , and receive: RX ) processing circuitry 1325 .
  • the terminal also includes a speaker 1330 , a processor 1340 , an input/output (I/O) interface (IF) 1345 , a touch screen 1350 , a display 1355 and a memory 1360 .
  • the memory 1360 includes an operating system (OS) 1361 and one or more applications 1362 .
  • OS operating system
  • applications 1362 one or more applications
  • the RF transceiver 1310 receives an input RF signal transmitted by the base station of the network from the antenna 1305 .
  • the RF transceiver 1310 down-converts the input RF signal to generate an intermediate frequency (IF) or baseband signal.
  • the IF or baseband signal is transmitted to the RX processing circuitry 1325, which filters, decodes, and/or digitizes the baseband or IF signal to generate a processed baseband signal. .
  • the RX processing circuit 1325 transmits the processed baseband signal to the speaker 1330 (such as for voice data) or the processor 1340 (for web browsing data) for further processing. as) is sent to
  • the TX processing circuit 1315 receives analog or digital voice data from the microphone 1320 , or other output baseband data (web data, email, or interactive video game data) from the processor 1340 . data) is received.
  • the TX processing circuit 1315 encodes, multiplexes, and/or digitizes the output baseband data to generate a processed baseband or IF signal.
  • the RF transceiver 1310 receives the processed baseband or IF signal output from the TX processing circuit 1315 , and up-converts the baseband or IF signal into an RF signal transmitted through the antenna 1305 . (up-convert).
  • the processor 1340 may include one or more processors or other processing devices, and may execute the OS 1361 stored in the memory 1360 to control the overall operation of the terminal.
  • the processor 1340 is configured to receive downlink channel signals and uplink channel signals by the RF transceiver 1310 , the RX processing circuitry 1325 and the TX processing circuitry 1315 according to well-known principles. You can control their transmission.
  • the processor 1340 includes at least one microprocessor or microcontroller.
  • the processor 1340 performs overall operations related to signal transmission/reception methods for groupcast or multicast.
  • the processor 1340 transmits the HARQ feedback information to the base station or the terminal when transmitting data for the groupcast to the terminals. Performs overall operations related to a method supporting transmission to a transmitter.
  • the processor 1340 transmits data for groupcast to terminals, and when the terminals are RRC_connected terminals, uni When data for cast or broadcast is received together with data for groupcast, the overall operation related to the method of which data to receive and how to transmit HARQ feedback information for the received data is performed. .
  • the processor 1340 transmits groupcast data to terminals, and when the terminals are RRC_connected terminals, the RRC_connected terminal
  • the overall operation related to the data receiving method is performed according to their capabilities.
  • the processor 1340 may also execute other processes and programs resident in the memory 1360 , such as processes for CSI feedback on the uplink channel.
  • the processor 1340 may move data into or out of the memory 1360 when required by a running process.
  • the processor 1340 is configured to execute the applications 1362 based on the OS program 1361 or in response to signals received from base stations or an operator.
  • the processor 1340 is coupled to the I/O interface 1345, which provides the terminal with access to other devices such as laptop computers and handheld computers. Provides connectivity capabilities.
  • the I/O interface 1345 is a communication path between these accessories and the processor 1340 .
  • the processor 1340 is also coupled to the touch screen 1350 and the display unit 1355 .
  • the operator of the terminal may input data into the terminal using the touch screen 1350 .
  • the display 1355 may be a liquid crystal crystal display, light emitting diode display, or other display capable of rendering text and/or at least limited graphics, such as from web sites.
  • the memory 1360 is coupled to the processor 1340 .
  • a portion of the memory 1360 may include random access memory (RAM), and the remainder of the memory 1360 may include a flash memory or other read-only memory (ROM). can do.
  • RAM random access memory
  • ROM read-only memory
  • FIG. 13 shows an example of a terminal
  • various changes may be made to FIG. 13 .
  • various components in FIG. 13 may be combined, further divided, or omitted, and other components may be added according to special needs.
  • the processor 1340 may include multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). can be divided.
  • the terminal is configured like a mobile phone or a smart phone in FIG. 13 , the terminal may be configured to operate as other types of mobile or stationary devices.
  • each of the terminal and the base station for carrying out the embodiments of the present disclosure may include a transmitter, a receiver, and a processor.
  • the receiving unit, processing unit, and transmitting unit of each of the base station and the terminal according to each embodiment as described above it should work
  • the base station may be a terminal performing transmission in the sidelink or may be a general base station.
  • the terminal may be a terminal that performs transmission or reception in a sidelink.
  • FIG. 14 is a block diagram schematically illustrating an internal structure of a terminal according to embodiments of the present disclosure.
  • the terminal may include a receiver 1400 , a transmitter 1404 , and a processor 1402 .
  • the receiving unit 1400 and the transmitting unit 1404 may be collectively referred to as a transceiver in embodiments of the present disclosure.
  • the transceiver may transmit/receive a signal to/from the base station.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
  • the transceiver may receive a signal through a wireless channel and output it to the processing unit 2002 , and transmit the signal output from the processing unit 2002 through a wireless channel.
  • the processing unit 2002 may control a series of processes so that the terminal can operate according to the above-described embodiments of the present disclosure.
  • 15 is a block diagram schematically illustrating an internal structure of a base station according to embodiments of the present disclosure.
  • the base station may include a receiving unit 1501 , a transmitting unit 1505 , and a processing unit 1503 .
  • the receiving unit 1501 and the transmitting unit 1505 may be collectively referred to as a transceiver in embodiments of the present disclosure.
  • the transceiver may transmit/receive a signal to/from the terminal.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
  • the transceiver may receive a signal through a wireless channel and output it to the processing unit 1503 , and transmit the signal output from the processing unit 1503 through a wireless channel.
  • the base station processing unit 1503 may control a series of processes so that the base station can operate according to the above-described embodiments of the present disclosure.

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PCT/KR2021/009303 2020-08-05 2021-07-20 무선 통신 시스템에서 그룹캐스트를 위한 신호 송/수신 방법 및 장치 Ceased WO2022030813A1 (ko)

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EP21853990.6A EP4191918A4 (en) 2020-08-05 2021-07-20 Method and apparatus for transmitting/receiving signal for groupcast in wireless communication system
JP2023507834A JP7777120B2 (ja) 2020-08-05 2021-07-20 無線通信システムにおけるグループキャストのための信号送受信方法及び装置
CN202180057213.6A CN116057969B (zh) 2020-08-05 2021-07-20 无线通信系统中用于发送/接收用于组播的信号的方法和装置
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KR20230048033A (ko) 2023-04-10
JP7777120B2 (ja) 2025-11-27
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CN116057969A (zh) 2023-05-02
EP4191918A4 (en) 2024-02-28
US20230362932A1 (en) 2023-11-09
EP4191918A1 (en) 2023-06-07

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