WO2022019729A1 - Procédé et dispositif de transmission et de réception d'informations et de données de commande dans un système de communication à l'aide d'une liaison latérale - Google Patents

Procédé et dispositif de transmission et de réception d'informations et de données de commande dans un système de communication à l'aide d'une liaison latérale Download PDF

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Publication number
WO2022019729A1
WO2022019729A1 PCT/KR2021/009658 KR2021009658W WO2022019729A1 WO 2022019729 A1 WO2022019729 A1 WO 2022019729A1 KR 2021009658 W KR2021009658 W KR 2021009658W WO 2022019729 A1 WO2022019729 A1 WO 2022019729A1
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Prior art keywords
sci
terminal
information
pssch
control information
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PCT/KR2021/009658
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English (en)
Korean (ko)
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여정호
명세호
김영범
류현석
박성진
신철규
최승훈
Original Assignee
삼성전자 주식회사
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Priority claimed from KR1020200099457A external-priority patent/KR20220013280A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Publication of WO2022019729A1 publication Critical patent/WO2022019729A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for transmitting and receiving data of a terminal through a sidelink in a wireless communication system.
  • the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE system after (Post LTE) system.
  • the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
  • mmWave very high frequency
  • ACM advanced coding modulation
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Small Cell Superposition Coding
  • FBMC Fan Bank Multi Carrier
  • NOMA non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M Machine Type Communication
  • MTC Machine Type Communication
  • IoT an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to
  • 5G communication technology is implemented by techniques such as beam forming, MIMO, and array antenna.
  • cloud radio access network cloud RAN
  • FQAM Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation
  • SWSC Small Cell Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA Non Orthogonal Multiple Access
  • SCMA Sparse Code Multiple Access
  • a wireless communication system develops, such as a 5G system, it is expected to be able to provide various services.
  • a sidelink such as V2X communication
  • a method of mapping sidelink control information to resources and determining a transport block size (TBS) A method needs to be devised.
  • a method and apparatus for transmitting and receiving control information and data in a wireless communication system are provided through the present disclosure.
  • An embodiment of the present disclosure provides a method and apparatus for determining control information mapping in a sidelink. Since the mapping method of control information is determined according to the method and apparatus proposed in an embodiment of the present disclosure, the transmitting terminal and the receiving terminal can understand the mapping of control information transmitted and received with each other as the same mapping method.
  • a method and apparatus for determining a transport block size (TBS) for data transmission/reception in a sidelink are provided through an embodiment of the present disclosure.
  • TBS transport block size
  • a method for a transmitting terminal to transmit a PSSCH in a wireless communication system includes: determining a resource for transmitting the PSSCH; determining scheduling parameters to be included in SCI based on the determined resource for transmitting the PSSCH; determining a value of a bit field of second control information and a transmission resource to which the second control information is mapped based on the determined scheduling parameters; Based on the determined scheduling parameters, the value of the bitfield of the second control information, and the transmission resource to which the second control information is mapped, the bitfield value of the first control information and the transmission resource to which the first control information is mapped determining; and transmitting the first control information, the second control information, and the PSSCH.
  • a method for decoding a PSSCH in a receiving terminal of a mobile communication system includes decoding first control information, and determining whether to decode the second control information according to a decoding result of the first control information determining, based on a decoding result of the first control information and a decoding result of the second control information, determining a PSSCH transmission resource, and decoding the PSSCH based on the PSSCH transmission resource can
  • a method of a first terminal in a communication system includes transmitting first sidelink control information (SCI) to a second terminal; and transmitting a second SCI and sidelink data to the second terminal based on the first SCI, wherein the number of coded modulation symbols for transmission of the second SCI is the It is characterized in that it is based on the first SCI.
  • SCI sidelink control information
  • a method of a second terminal in a communication system includes: receiving a first SCI from a first terminal; and receiving a second SCI and sidelink data from the first terminal based on the first SCI, wherein the number of coded modulation symbols for transmission of the second SCI is based on the first SCI characterized in that
  • a first terminal of a communication system includes: a transceiver; and connected to the transceiver, transmits a first SCI to a second terminal through the transceiver, and based on the first SCI, transmits a second SCI and sidelink data to the second terminal through the transceiver and a controller, wherein the number of coded modulation symbols for transmission of the second SCI is based on the first SCI.
  • a second terminal of a communication system includes: a transceiver; and connected to the transceiver, receiving a first SCI from a first terminal through the transceiver, and based on the first SCI, receiving a second SCI and sidelink data from the first terminal through the transceiver and a controller, wherein the number of coded modulation symbols for transmission of the second SCI is based on the first SCI.
  • control information and data may be achieved in a wireless communication system, particularly, in a communication system using a sidelink.
  • the transmitting terminal and the receiving terminal can understand the mapping of control information transmitted and received with each other as the same mapping method.
  • the transmitting and receiving terminals may have a common understanding of the size of a TB (transport block) when performing communication between terminals, smooth communication between terminals may be possible.
  • FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram illustrating a resource structure in a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.
  • 6A is a diagram illustrating an example of allocation of data for each service to a frequency-time resource in a wireless communication system according to an embodiment of the present disclosure.
  • 6B is a diagram illustrating another example of allocating data for each service to a frequency-time resource in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 7 is a diagram illustrating a data encoding method in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 8 is a diagram illustrating a mapping of a synchronization signal and a broadcast channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram illustrating an example of arrangement of a synchronization signal/physical broadcast channel block (SSB) in a wireless communication system according to an embodiment of the present disclosure.
  • SSB synchronization signal/physical broadcast channel block
  • 10A is a diagram illustrating transmittable symbol positions of an SSB according to a subcarrier interval in a wireless communication system according to an embodiment of the present disclosure.
  • 10B is a diagram illustrating transmittable symbol positions of an SSB according to a subcarrier interval in a wireless communication system according to an embodiment of the present disclosure.
  • 11 is a diagram illustrating an example of generation and transmission of parity bits in a wireless communication system according to an embodiment of the present disclosure.
  • 12A is a diagram illustrating an example of groupcasting transmission in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 12B is a diagram illustrating an example of hybrid automatic repeat request (HARQ) feedback transmission according to group casting in a wireless communication system according to an embodiment of the present disclosure.
  • HARQ hybrid automatic repeat request
  • FIG. 13 is a diagram illustrating an example of unicasting transmission in a wireless communication system according to an embodiment of the present disclosure.
  • 14A is a diagram illustrating an example of sidelink data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • 14B is a diagram illustrating an example of sidelink data transmission without scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • 15 is a diagram illustrating an example of a channel structure of a slot used for sidelink communication in a wireless communication system according to an embodiment of the present disclosure.
  • 16A is a diagram illustrating a first example of a distribution of a feedback channel in a wireless communication system according to an embodiment of the present disclosure.
  • 16B is a diagram illustrating a second example of distribution of a feedback channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 17A is a diagram illustrating an example of a method in which resource allocation of a physical sidelink shared channel (PSSCH) is performed in units of subchannels according to an embodiment of the present disclosure.
  • PSSCH physical sidelink shared channel
  • 17B is a diagram illustrating an example of a method in which resource allocation of a PSSCH is performed in units of subchannels according to an embodiment of the present disclosure.
  • 18 is a flowchart illustrating a method for a transmitting terminal to determine values of bit fields of first control information and second control information according to an embodiment of the present disclosure.
  • 19 is a flowchart illustrating a method for a receiving terminal to sequentially decode first control information and second control information, and to decode a PSSCH based on the first control information according to an embodiment of the present disclosure.
  • 20 is a diagram illustrating an example in which a frequency domain is divided in units of subchannels in a given resource pool according to an embodiment of the present disclosure, and resource allocation for data transmission is allocated in units of subchannels.
  • DMRS demodulation reference signal
  • 22A is a diagram illustrating a pattern including one DMRS symbol according to an embodiment of the present disclosure.
  • 22B is a diagram illustrating a pattern including two DMRS symbols according to an embodiment of the present disclosure.
  • 22C is a diagram illustrating a pattern including three DMRS symbols according to an embodiment of the present disclosure.
  • 22D is a diagram illustrating a pattern including four DMRS symbols according to an embodiment of the present disclosure.
  • 23A is a diagram illustrating a modified example of a DMRS pattern according to an embodiment of the present disclosure.
  • 23B is a diagram illustrating a modified example of a DMRS pattern according to an embodiment of the present disclosure.
  • 23C is a diagram illustrating a modified example of a DMRS pattern according to an embodiment of the present disclosure.
  • 24 is a diagram illustrating a mapping in a symbol to which a DMRS for decoding a PSSCH is mapped in sidelink data transmission/reception according to an embodiment of the present disclosure
  • 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
  • 26 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.
  • FIG. 27 is a block diagram of a terminal according to an embodiment of the present disclosure.
  • 28 is a block diagram of a base station according to an embodiment of the present disclosure.
  • 29 is a diagram illustrating a method of transmitting second control information in a PSSCH according to an embodiment of the present disclosure.
  • FIG. 30 is a diagram illustrating another example in which second control information is mapped according to an embodiment of the present disclosure.
  • FIG. 31 is a diagram illustrating another example in which second control information is mapped according to an embodiment of the present disclosure.
  • 32 is a diagram illustrating an embodiment of a symbol allocated to a PSSCH according to an embodiment of the present disclosure
  • 33 is a diagram illustrating an embodiment of a symbol allocated to a PSSCH according to an embodiment of the present disclosure.
  • 34 is a diagram illustrating an embodiment in which second control information is mapped according to an embodiment of the present disclosure.
  • 35 is a diagram illustrating a case in which a resource for mapping second control information is insufficient according to an embodiment of the present disclosure
  • 36 is a diagram illustrating an example in which second control information is mapped to all remaining REs when there are resource elements (REs) remaining in a resource block (RB) to which second control information is mapped according to an embodiment of the present disclosure.
  • REs resource elements
  • RB resource block
  • 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). Create 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 (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles do.
  • '-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.
  • ' ⁇ ' refers to 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.
  • ' ⁇ units' may be combined into a smaller number of elements 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.
  • Terms for identification, terms for messages, terms for interfaces between network objects, terms for various types of identification information, and the like are exemplified for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.
  • a physical channel and a signal may be used interchangeably with a data or a control signal.
  • a physical downlink shared channel (PDSCH) (or PSSCH) is a term that refers to a physical channel through which data is transmitted, but the PDSCH (or PSSCH) may also be used to refer to data. That is, in the present disclosure, the expression 'transmitting a physical channel' may be interpreted equivalently to the expression 'transmitting data or a signal through a physical channel'.
  • higher signaling refers to a signal transmission method in which a base station is transmitted to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer.
  • Upper signaling may be understood as radio resource control (RRC) signaling or MAC control element (hereinafter, 'CE').
  • RRC radio resource control
  • 'CE' MAC control element
  • the present disclosure uses terms and names defined in 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) or New Radio (NR) standards, or terms and names modified based on them.
  • LTE Long Term Evolution
  • NR New Radio
  • the present disclosure is not limited by the above-described terms and names, and may be equally applied to systems conforming to other standards.
  • the present disclosure is applicable to 3GPP NR (5th generation mobile communication standard).
  • the present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services based on 5G communication technology and IoT-related technology) etc.) can be applied.
  • FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 1 is a diagram illustrating a base station 110 , a terminal 120 , and a terminal 130 as part of nodes using a wireless channel in a wireless communication system. 1 shows only one base station, other base stations that are the same as or similar to the base station 110 may be further included.
  • the base station 110 is a network infrastructure that provides wireless access to the terminals 120 and 130 .
  • the base station 110 has coverage defined as a certain geographic area based on a distance capable of transmitting a signal.
  • the base station 110 includes an 'access point (AP)', an 'eNodeB (eNodeB)', a '5G node (5th generation node)', a 'next generation nodeB' , gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms having an equivalent technical meaning.
  • Each of the terminal 120 and the terminal 130 is a device used by a user, and performs communication with the base station 110 through a wireless channel.
  • the link from the base station 110 to the terminal 120 or the terminal 130 is downlink (DL), and the link from the terminal 120 or the terminal 130 to the base station 110 is uplink (UL). ) is referred to as
  • the terminal 120 and the terminal 130 may perform communication through a mutual wireless channel.
  • a device-to-device link (D2D) between the terminal 120 and the terminal 130 is referred to as a sidelink, and the sidelink may be mixed with a PC5 interface.
  • at least one of the terminal 120 and the terminal 130 may be operated without the user's involvement.
  • At least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by the user.
  • MTC machine type communication
  • Each of the terminal 120 and the terminal 130 is a 'user equipment (UE)', a 'mobile station', a 'subscriber station', a 'remote terminal other than the terminal (terminal)' )', 'wireless terminal', or 'user device' or other terms having an equivalent technical meaning.
  • the base station 110 , the terminal 120 , and the terminal 130 may transmit and receive radio signals in millimeter wave (mmWave) bands (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz).
  • mmWave millimeter wave
  • the base station 110 , the terminal 120 , and the terminal 130 may perform beamforming.
  • the beamforming may include transmit beamforming and receive beamforming. That is, the base station 110 , the terminal 120 , and the terminal 130 may impart directivity to a transmission signal or a reception signal.
  • the base station 110 and the terminals 120 and 130 may select the serving beams 112, 113, 121, and 131 through a beam search or beam management procedure. .
  • subsequent communication may be performed through a resource having a quasi co-located (QCL) relationship with the resource that has transmitted the serving beams 112, 113, 121, 131. Can be performed. have.
  • QCL quasi co-located
  • the first antenna port and the second antenna port are said to be in a QCL relationship.
  • a wide range of characteristics include delay spread, Doppler spread, Doppler shift, average gain, average delay, spatial receiver parameter. may include at least one of
  • FIG. 2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • the configuration illustrated in FIG. 2 may be understood as a configuration of the base station 110 .
  • Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.
  • the base station may include a wireless communication unit 210 , a backhaul communication unit 220 , a storage unit 230 , and a control unit 240 .
  • the wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a conversion function between the baseband signal and the bit stream according to the physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream by demodulating and decoding the baseband signal.
  • the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits it through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal.
  • the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like.
  • the wireless communication unit 210 may include a plurality of transmission/reception paths.
  • the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.
  • the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. can be composed of
  • the digital unit may be implemented by at least one processor (eg, a digital signal processor (DSP)).
  • DSP digital signal processor
  • the wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel may be used to mean that the above-described processing is performed by the wireless communication unit 210 .
  • the backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts the bit string transmitted from the base station to another node, for example, another access node, another base station, upper node, core network, etc. into a physical signal, and converts the physical signal received from the other node. Convert to bit string.
  • the storage unit 230 stores data such as a basic program, an application program, and setting information for the operation of the base station.
  • the storage unit 230 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory.
  • the storage unit 230 provides the stored data according to the request of the control unit 240 .
  • the controller 240 controls overall operations of the base station. For example, the control unit 240 transmits and receives a signal through the wireless communication unit 210 or through the backhaul communication unit 220 . In addition, the control unit 240 writes and reads data in the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by the communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the controller 240 may include at least one processor. According to an embodiment, the controller 240 may control the base station to perform operations according to an embodiment in an embodiment to be described later.
  • FIG. 3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
  • the configuration illustrated in FIG. 3 may be understood as a configuration of the terminal 120 .
  • Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.
  • the terminal may include a communication unit 310 , a storage unit 320 , and a control unit 330 .
  • the communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream by demodulating and decoding the baseband signal. In addition, the communication unit 310 up-converts the baseband signal into an RF band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal.
  • the communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.
  • the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented as one package. Also, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.
  • RFIC radio frequency integrated circuit
  • the communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel may be used to mean that the above-described processing is performed by the communication unit 310 .
  • the storage unit 320 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 320 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory.
  • the storage unit 320 provides the stored data according to the request of the control unit 330 .
  • the controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives a signal through the communication unit 310 . In addition, the control unit 330 writes and reads data in the storage unit 320 . And, the control unit 330 may perform the functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to an embodiment, the controller 330 may control the terminal to perform operations according to an embodiment in an embodiment to be described later.
  • CP communication processor
  • FIG. 4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 is a diagram illustrating components for performing beamforming as a part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 .
  • the wireless communication unit 210 or the communication unit 310 includes an encoding and modulation unit 402 , a digital beamforming unit 404 , a plurality of transmission paths 406-1 to 406-N, or analog It may include a beamformer 408 .
  • the encoding and modulation unit 402 performs channel encoding.
  • channel encoding at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used.
  • LDPC low density parity check
  • the encoder and modulator 402 generates modulation symbols by performing constellation mapping.
  • the digital beamformer 404 performs beamforming on a digital signal (eg, modulation symbols). To this end, the digital beamformer 404 multiplies the modulation symbols by beamforming weights.
  • the beamforming weights are used to change the magnitude and phase of a signal, and may be referred to as a 'precoding matrix', a 'precoder', or the like.
  • the digital beamformer 404 outputs digital beamformed modulation symbols to the plurality of transmission paths 406-1 to 406-N.
  • modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 to 406-N.
  • the plurality of transmission paths 406 - 1 to 406 -N convert digital beamformed digital signals into analog signals.
  • each of the plurality of transmission paths 406 - 1 to 406 -N may include an inverse fast fourier transform (IFFT) calculator, a cyclic prefix (CP) inserter, a DAC, and an up converter.
  • the CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) method, and may be excluded when another physical layer method (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406 - 1 to 406 -N provide independent signal processing processes for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406 - 1 to 406 -N may be used in common.
  • OFDM orthogonal frequency division multiplexing
  • the analog beamformer 408 performs beamforming on an analog signal.
  • the digital beamformer 404 multiplies the analog signals by beamforming weights.
  • the beamforming weights may be used to change the magnitude and phase of the signal.
  • the analog beamformer 440 may be variously configured according to a connection structure between the plurality of transmission paths 406 - 1 to 406 -N and antennas.
  • each of the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array.
  • a plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array.
  • the plurality of transmission paths 406 - 1 to 406 -N may be adaptively connected to one antenna array or connected to two or more antenna arrays.
  • 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-A (Advanced), 3GPP2 HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE 802.16e, such as communication standards, such as high-speed, high-quality packet data service is developing into a broadband wireless communication system.
  • HSPA high speed packet access
  • LTE long term evolution
  • E-UTRA evolved universal terrestrial radio access
  • LTE-A Advanced
  • 3GPP2 HRPD high rate packet data
  • UMB ultra mobile broadband
  • IEEE 802.16e such as communication standards, such as high-speed, high-quality packet data service is developing into a broadband wireless communication system.
  • 5G wireless communication system a communication standard of 5G or NR (new radio) is being made.
  • the NR system employs an orthogonal frequency division multiplexing (OFDM) scheme in downlink (DL) and uplink. More specifically, a cyclic-prefix OFDM (CP-OFDM) scheme in downlink and a discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme in uplink along with CP-OFDM are adopted in the uplink.
  • the uplink refers to a radio link through which the terminal transmits data or control signals to the base station
  • the downlink refers to a radio link through which the base station transmits data or control signals to the user equipment.
  • the multiple access method divides the data or control information of each user by allocating and operating the time-frequency resources in which the data or control information is transmitted for each user in general so that they do not overlap each other, that is, orthogonality is established.
  • 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 data, the receiver transmits a negative acknowledgment (NACK), which is information informing the transmitter of decoding failure, so that the transmitter can retransmit the data in the physical layer.
  • NACK negative acknowledgment
  • the receiver can improve data reception performance by combining data retransmitted by the transmitter with data that has previously failed to be decoded.
  • the transmitter can transmit new data by transmitting an acknowledgment (ACK), which is information informing the transmitter of decoding success, to the transmitter.
  • ACK acknowledgment
  • FIG. 5 is a diagram illustrating a resource structure in a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in downlink or uplink.
  • 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
  • N symb OFDM symbols 502 are gathered to form one slot 506 .
  • the length of the subframe is defined as 1.0ms
  • the length of the radio frame 514 is defined as 10ms.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is composed of a total of N BW subcarriers 504 . Specific numerical values such as N symb and N BW may be variably applied depending on the system.
  • a basic unit of a resource in the time-frequency domain is a resource element (hereinafter, 'RE') 512, which may be represented by an OFDM symbol index and a subcarrier index.
  • a resource block (RB, or physical resource block, hereinafter 'PRB') 508 consists of N symb consecutive OFDM symbols 502 in the time domain and N RB consecutive subcarriers 510 in the frequency domain. is defined Thus, one RB 508 includes N symb ⁇ N RB REs 512 .
  • the minimum transmission unit of data is an RB.
  • N symb 14
  • N RB 12
  • N BW and N RB are proportional to the bandwidth of the system transmission band.
  • a data rate may increase in proportion to the number of RBs scheduled for the UE.
  • the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other.
  • the channel bandwidth represents a radio frequency (RF) bandwidth corresponding to the system transmission bandwidth.
  • RF radio frequency
  • [Table 1] and [Table 2] show the correspondence between system transmission bandwidth, subcarrier spacing (SCS) and channel bandwidth defined in the NR system in frequency bands lower than 6 GHz and higher than 6 GHz represents a part of For example, an NR system having a 100 MHz channel bandwidth with a 30 kHz subcarrier spacing consists of 273 RBs.
  • N/A may be a bandwidth-subcarrier combination not supported by the NR system.
  • scheduling information for downlink data or uplink data may be transmitted from the base station to the terminal through downlink control information (hereinafter 'DCI').
  • DCI is defined in various formats, and whether it is an uplink grant that is scheduling information for uplink data or a downlink grant that is scheduling information for downlink data, and the size of control information according to each format. Whether it is a small compact DCI, whether spatial multiplexing using multiple antennas is applied, whether DCI for power control, etc. may be determined.
  • DCI format 1-1 which is scheduling control information for downlink data, may include at least one of items shown in Table 3 below.
  • Item Contents carrier indicator It indicates on which frequency carrier it is transmitted.
  • DCI format indicator This is an indicator for distinguishing whether the corresponding DCI is for downlink or uplink.
  • BWP (bandwidth part) directive It indicates in which BWP it is transmitted.
  • Frequency domain resource allocation Indicates an RB in a frequency domain allocated for data transmission. A resource to be expressed may be determined according to a system bandwidth and a resource allocation method.
  • Time domain resource allocation indicates in which OFDM symbol in which slot a data-related channel is to be transmitted.
  • VRB-to-PRB mapping It indicates how to map a virtual RB (VRB) index and a physical RB (PRB) index.
  • Modulation and coding scheme MCS It indicates the modulation method and coding rate used for data transmission.
  • CBG transmission information codeblock group transmission information
  • HARQ process number indicates the process number of HARQ.
  • New data indicator Indicates whether the HARQ is initial transmission or retransmission.
  • RV redundancy version
  • TPC transmit power control command
  • PUCCH Physical uplink control channel
  • time domain resource assignment is information about a slot in which the PDSCH is transmitted and the start symbol position S in the slot and the number of symbols L to which the PDSCH is mapped.
  • 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 [Table 4] below.
  • SLIV can be determined.
  • information about the correspondence between the SLIV value and the PDSCH or physical uplink shared channel (PUSCH) mapping type and information on the slot in which the PDSCH or PUSCH is transmitted is configured in one row through the RRC setting ( configured). Thereafter, by using the time domain resource allocation of DCI, the base station indicates to the terminal an index value defined in the configured correspondence, information on the slot in which the SLIV value, the PDSCH or PUSCH mapping type, and the PDSCH or PUSCH are transmitted can pass
  • PDSCH or PUSCH mapping types are defined as type A and type B.
  • a demodulation reference signal (DMRS) symbol starts in the second or third OFDM symbol in the slot.
  • DMRS symbol starts from the first OFDM symbol of a time domain resource allocated for PUSCH transmission.
  • DCI may be transmitted in a physical downlink control channel (PDCCH) that is a downlink control channel through channel coding and modulation.
  • PDCCH may be used to refer to control information itself rather than a channel.
  • DCI is scrambled by using a specific radio network temporary identifier (RNTI) or terminal identifier independently for each terminal, and is configured as an independent PDCCH after adding a cyclic redundancy check (CRC) and channel coding, and being transmitted can
  • RNTI radio network temporary identifier
  • CRC cyclic redundancy check
  • the PDCCH may be mapped to a control resource set (CORESET) configured for the UE.
  • CORESET control resource set
  • Downlink data may be transmitted in 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 may be indicated by 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 data to be transmitted (eg, transport block size (TBS).
  • TBS transport block size
  • the MCS is It may be composed of 5 bits or more or fewer bits
  • the TBS corresponds to the size before channel coding for error correction is applied to TB (transport block), which is data that the base station wants to transmit.
  • a transport block may include a medium access control (MAC) header, MAC CE, one or more MAC service data unit (SDU), and padding bits.
  • TB may indicate a data unit or MAC protocol data unit (PDU) that is sent down from the MAC layer to the physical layer.
  • MAC medium access control
  • SDU MAC service data unit
  • PDU MAC protocol data unit
  • Modulation schemes supported by the NR system are QPSK (quadrature phase shift keying), 16 QAM (quadrature amplitude modulation), 64 QAM, and 256 QAM, and each modulation order (Qm) is 2, 4, 6 or It could be 8. That is, 2 bits per symbol for QPSK, 4 bits per symbol for 16 QAM, 6 bits per symbol for 64 QAM, and 8 bits per symbol for 256 QAM may be transmitted, 1024 When QAM is supported, 10 bits per one symbol of 1024 QAM may be mapped and transmitted.
  • the NR system is designed to allow various services to be multiplexed freely in time and frequency resources, and accordingly, waveform/numerology, reference signals, etc. are dynamically or as needed. can be freely adjusted.
  • waveform/numerology, reference signals, etc. are dynamically or as needed. can be freely adjusted.
  • it is important to optimize data transmission through measurement of channel quality and interference, and accordingly, accurate channel state measurement is essential.
  • FSG frequency resource group
  • the NR system can divide the types of supported services into eMBB (enhanced mobile broadband), mMTC (massive machine type communications), and 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. Examples of resource distribution of each service are shown in FIGS. 6A and 6B below.
  • FIGS. 6A and 6B Examples of resource distribution of each service are shown in FIGS. 6A and 6B below.
  • 6A is a diagram illustrating an example of allocation of data for each service to a frequency-time resource in a wireless communication system according to an embodiment of the present disclosure.
  • resources may be allocated for the eMBB 622 , the URLLCs 612 , 614 , 616 , and the mMTC 632 in the entire system frequency band 610 .
  • URLLC (612, 614, 616) data is generated while eMBB (622) data and mMTC (632) data are allocated and transmitted in a specific frequency band, eMBB (622) and mMTC (632) data are already allocated for eMBB (622) and mMTC (632).
  • URLLC (612, 614, 616) data can be transmitted without emptying the part or transmitting eMBB (622) data and mMTC (632).
  • a resource for transmitting URLLC 612 , 614 , and 616 data may be allocated to a portion of the resource allocated to the eMBB 622 .
  • the eMBB 622 data may not be transmitted in the overlapping frequency-time resource. 622) data transmission performance may be reduced. That is, in this case, the eMBB 622 data transmission failure may occur due to the allocation of resources for the URLLCs 612 , 614 , and 616 .
  • the method shown in FIG. 6A may be referred to as a preemption method.
  • 6B is a diagram illustrating another example of allocating data for each service to a frequency-time resource in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 6B is a diagram illustrating an embodiment in which each service is provided in each of the subbands 662 , 664 , and 666 obtained by dividing the entire system frequency band 660 .
  • subband 662 may be used for URLLC 672, 674, 576 data transmission
  • subband 664 may be used for eMBB 682 data transmission
  • subband 666 may be used for mMTC 692 data transmission.
  • Information related to the configuration of the subbands 662 , 664 , and 666 may be predetermined, and the information may be transmitted from the base station to the terminal through higher level signaling. Alternatively, the base station or the network node may arbitrarily divide information related to the subbands 662 , 664 , and 666 without transmitting additional subband configuration information to the terminal and provide services according thereto.
  • a length of a transmission time interval (TTI) used for URLLC transmission may be shorter than a length of a TTI used for eMBB or mMTC transmission.
  • a response of URLLC-related information may be transmitted faster than eMBB or mMTC, and accordingly, a terminal using the URLLC service may transmit/receive information with a low delay response.
  • a structure of a physical layer channel used for each type may be different from each other. For example, at least one of a length of a TTI, an allocation unit of a frequency resource, a structure of a control channel, and a data mapping method may be different from each other.
  • FIG. 7 is a diagram illustrating a data encoding method in a wireless communication system according to an embodiment of the present disclosure.
  • CBs code blocks
  • a CRC 714 may be added to the rear or front end of one TB 712 to be transmitted in uplink or downlink.
  • the CRC 714 may have a 16-bit or 24-bit, or a pre-fixed number of bits, or a variable number of bits according to channel conditions, and may be used in the receiver to determine whether channel coding is successful.
  • a block to which the TB 712 and CRC 714 are added may be divided into a plurality of CBs 722-1, 722-2, 722-(N-1), and 722-N.
  • CRCs 732-1, 732-2, 732-(N-1), and 732-N may be added.
  • the CRCs 732-1, 732-2, 732-(N-1), and 732-N may have 16 bits or 24 bits or a pre-fixed number of bits, to determine whether channel coding is successful at the receiver. can be used for
  • a TB 712 and a cyclic generator polynomial may be used to generate the CRC 714 .
  • CRC p 1 ,p 2 ,... ,p L-1 is a 0 D A+23 +a 1 D A+22 +... +a A-1 D 24 +p 0 D 23 +p 1 D 22 +...
  • the remainder may be determined to be 0.
  • the CRC length L is described as being 24, but the length L may be defined differently, such as 12, 16, 24, 32, 40, 48, 64, and the like.
  • the sum of TB and CRC may be divided into N CBs 722-1, 722-2, 722-(N-1), 722-N.
  • CRCs 732-1, 732-2, 732-(N-1), and 732-N are added to each of the CBs 722-1, 722-2, 722-(N-1), and 722-N.
  • the CRC added to each CB may be generated based on a CRC of a different length or a different cyclic generation polynomial than when generating the CRC added to the TB.
  • 732-2, 732-(N-1), and 732-N) may be omitted depending on the type of channel code to be applied to the CB.
  • a low density parity code (LDPC) code not a turbo code
  • CRCs 732-1, 732-2, 732-(N-1), and 732-N are added to each CB. may be omitted.
  • the CRCs 732-1, 732-2, 732-(N-1), and 732-N are the CBs 732-1, 732-2, 732-(N-1). ), 732-N).
  • the CRC may be added or omitted.
  • the maximum length of one CB is determined according to the type of channel coding applied to the TB, and the TB and CRC added to the TB according to the maximum length of the CB can be divided into CBs. have.
  • CRC for CB is added to the divided CB, and the data bits and CRC of the CB are encoded with a channel code, and coded bits are determined accordingly, and each coded bit is as preset. The number of bits that are rate matched together may be determined.
  • FIG. 8 is a diagram illustrating a mapping of a synchronization signal and a broadcast channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 8 is a diagram illustrating an example of a mapped result in the frequency and time domains of synchronization signals and a physical broadcast channel (PBCH) of the NR system.
  • a primary synchronization signal (PSS) 802, a secondary synchronization signal (SSS) 806, and a PBCH 804 are mapped over four OFDM symbols, and the PSS 802 and SSS ( 806 may be mapped to 12 RBs, and PBCH 804 may be mapped to 20 RBs.
  • a frequency bandwidth of 20 RBs according to subcarrier spacing (SCS) is shown in FIG. 8 .
  • a set of PSS 802, SSS 806, and PBCH 804, or a resource region carrying PSS 802, SSS 806, and PBCH 804 is called an SS/PBCH block (SS block, SSB). may be referred to.
  • FIG. 9 is a diagram illustrating an example of arrangement of an SSB in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram illustrating an example of an LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz as an example of which symbols are mapped to one SSB in a slot.
  • the SSBs of the NR system at positions 902, 904, 906, 908 that do not overlap with cell-specific reference signals (CRSs) that are always transmitted in the LTE system ( 910, 912, 914, 916) may be transmitted.
  • CRSs cell-specific reference signals
  • the design shown in FIG. 9 may be to enable the LTE system and the NR system to coexist in one frequency band.
  • FIGS. 10A and 10B are diagrams illustrating transmittable symbol positions of an SSB according to a subcarrier interval in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 10A is a diagram illustrating symbol positions at which SSB can be transmitted within a 1 ms interval and FIG. 10B within a 5 ms interval.
  • the SSB does not always have to be transmitted, and the SSB may or may not be transmitted according to the selection of the base station.
  • the size of the TB may 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 the number of subcarriers included in one RB (eg 12), is the number of OFDM symbols allocated to the PDSCH, is the number of REs in one PRB occupied by a demodulation reference signal (DMRS) of the same code division multiplexing (CDM) group, denotes the number of REs (eg, set to one of 0, 6, 12, 18) occupied by an overhead in one PRB configured by higher-order signaling.
  • DMRS demodulation reference signal
  • CDM code division multiplexing
  • Step 2 Number of Temporary Information Bits Is can be calculated as Here, R denotes a code rate, Qm denotes a modulation order, and ⁇ denotes the number of allocated layers.
  • the coding rate and the modulation order may be transmitted using an MCS field included in the control information and a predefined correspondence relationship. if, , the TBS may be calculated according to step 3 below, otherwise, according to step 4 below.
  • Step 3 Wow together with can be calculated. Then, the TBS in [Table 5] below of values not less than can be determined as the closest value to .
  • Step 4 Wow Depending on the can be calculated. Then, TBS It can be determined through a value and a pseudo-code as shown in [Table 6] below.
  • parity bits When one CB is input to the LDPC encoder, parity bits may be added and output. In this case, the size of the parity bit may vary according to the LDPC base graph. According to a method of rate matching, all parity bits generated by LDPC coding may be transmittable or only some of the parity bits may be transmittable. A method of processing all parity bits generated by LDPC coding to be transmittable is referred to as 'full buffer rate matching (FBRM)', and a method of limiting the number of transmitable parity bits is 'LBRM (limited buffer rate matching)'. is referred to as When a resource is allocated for data transmission, an LDPC encoder output is input to a circular buffer, and bits of the buffer may be repeatedly transmitted as much as the allocated resource.
  • FBRM full buffer rate matching
  • the length of the circular buffer is N cb and the number of all parity bits generated by LDPC coding is N
  • the above-described method of determining the TBS may be used to determine .
  • C is the actual number of code blocks of the scheduled TB during scheduling.
  • the number of layers is assumed to be the maximum number of layers supported by the UE in the corresponding cell
  • the modulation order is assumed to be the maximum modulation order set for the UE in the corresponding cell, or 64-QAM if not set
  • the coding rate is the maximum coding rate.
  • the rate is assumed to be 948/1024
  • N RE is assumed
  • Is can be assumed. may be defined as shown in [Table 7] below.
  • the maximum data rate supported by the terminal may be determined through the following [Equation 1].
  • J is the number of carriers bundled by carrier aggregation (CA)
  • Rmax 948/1024
  • is the subcarrier spacing. is one of 1, 0.8, 0.75, and 0.4, and may be reported by the terminal, can be given as shown in [Table 8] below.
  • the average OFDM symbol length can be calculated as Is is the maximum number of RBs in is an overhead value, and may be given as 0.14 in downlink and 0.18 in uplink of FR1 (eg, bands below 6 GHz or 7.125 GHz), and 0.08 in downlink of FR2 (eg, bands exceeding 6 GHz or 7.125 GHz) , may be given as 0.10 in uplink.
  • FR1 eg, bands below 6 GHz or 7.125 GHz
  • 0.08 in downlink of FR2 eg, bands exceeding 6 GHz or 7.125 GHz
  • the maximum data rate in the downlink in a cell having a 100 MHz frequency bandwidth at a 30 kHz subcarrier interval can be calculated as shown in [Table 9] 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 TBS (TB size) in 1 TB transmission or the sum of TBSs in 2 TB transmission by the TTI length.
  • the maximum actual data rate in downlink in a cell having a 100 MHz frequency bandwidth in a 30 kHz subcarrier interval may be determined as shown in [Table 10] below according to the number of allocated PDSCH symbols.
  • the maximum data rate supported by the terminal can be confirmed through [Table 9], and the actual data rate according to the allocated TBS can be confirmed through [Table 10]. In this case, depending on the scheduling information, there may be a case where the actual data rate is greater than the maximum data rate.
  • a data rate that the terminal can support may be preset between the base station and the terminal.
  • the data rate may be calculated using the maximum frequency band supported by the terminal, the maximum modulation order, the maximum number of layers, and the like.
  • the calculated data rate may be different from a value calculated from a transport block size (TBS) and a transmission time interval (TTI) length of a TB used for actual data transmission.
  • TBS transport block size
  • TTI transmission time interval
  • the terminal may be allocated a TBS that is larger than a value corresponding to the data rate supported by the terminal, and to prevent this, there may be restrictions on the TBS that can be scheduled according to the data rate supported by the terminal. It may be necessary to minimize this case and define the operation of the terminal in this case.
  • TBS LBRM is determined based on the number of layers or ranks supported by the UE, and the process is inefficient or the parameter configuration is ambiguous.
  • TBS LBRM is determined based on the number of layers or ranks supported by the UE, and the process is inefficient or the parameter configuration is ambiguous.
  • the present disclosure will describe various embodiments that can solve these problems.
  • 11 is a diagram illustrating an example of generation and transmission of parity bits in a wireless communication system according to an embodiment of the present disclosure.
  • 11 is a diagram illustrating an example of a process of dividing data to be transmitted into code blocks, generating parity bits by applying channel coding to the divided CB, and determining and transmitting parity bits to be transmitted.
  • one CB is transmitted to the channel encoder 1102 , and data bits 1112 and parity bits 1114 and 1116 may be generated by the channel encoder 1102 .
  • the channel encoder 1102 may perform encoding using LDPC, polar codes, or other channel codes.
  • the amount of generated parity bits may vary according to the type and details of the channel code. If the total length of the bits 1110 generated by the encoding of the channel encoder 1102 is N bits, when all parity bits 1114 and 1116 are transmitted, the receiver can store N bits of received information. Softbuffers or memory may be required. If the receiver uses a soft buffer having a size smaller than N bits, reception performance may be deteriorated.
  • a method of determining not transmitted parity bits 1116 and not transmitting the determined parity bits 1116 may be used. That is, only the data bits 1112 and a portion 1114 of the parity bits are input to the transmit buffer 1120 and transferred to the soft buffer 1130 , so that they can be transmitted. That is, transmittable parity bits may be limited, and the limited amount may be the sum of the size of the data bits 1112 and the size of some of the parity bits 1114 , and may be referred to as N cb .
  • N cb is N, it means that transmittable parity bits are not limited, which means that all parity generated by the channel code can be transmitted/received without restriction within the allocated resource.
  • FBRM full buffer rate matching
  • N cb min(N,N ref )
  • LBRM 'limited buffer rate matching
  • the base station is a subject that performs resource allocation of the terminal, and may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication. That is, the base station may mean a gNB, an eNB, or a road site unit (RSU) or a fixed station.
  • the terminal supports not only general user equipment (UE), mobile station, but also vehicle-to-vehicular (V2V) communication and vehicle-to-pedestrian communication (vehicular-to-pedestrian, V2P).
  • UE general user equipment
  • V2V vehicle-to-vehicular
  • V2P vehicle-to-pedestrian
  • a vehicle or pedestrian's handset such as a smartphone
  • a vehicle-to-vehicular-to-infrastructure (V2I) communication that supports vehicle-to-network (V2N) communication. It may be one of an RSU equipped with supporting vehicle and terminal functions, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function.
  • data may be transmitted from one terminal to a plurality of terminals, or data may be transmitted from one terminal to one terminal. Alternatively, data may be transmitted from the base station to a plurality of terminals.
  • the present disclosure is not limited thereto, and may be applied to various cases.
  • the terminal in order for a terminal to transmit/receive a sidelink signal, the terminal operates based on a resource pool already defined or set or preset between terminals.
  • the resource pool may be a set of frequency and time domain resources that can be used for transmission and reception of sidelink signals. That is, in order to transmit and receive a sidelink signal, transmission and reception of a sidelink signal must be performed in a predetermined frequency-time resource, and such resource is defined as a resource pool.
  • a resource pool may be defined for transmission and reception, respectively, and may be commonly defined and used for transmission and reception.
  • terminals may set one or a plurality of resource pools and perform transmission/reception of a sidelink signal.
  • Configuration information about the resource pool used for sidelink transmission and reception and other configuration information for sidelink are pre-installed when the terminal is produced, configured from the current base station, or other configuration information prior to accessing the current base station. It may be pre-configured from the base station or from another network unit, or it may be a fixed value (fixed), provisioned from the network, or self-constructed by the terminal itself.
  • the base station may indicate the start index and length (eg, the number of PRBs) of PRBs belonging to the resource pool, but is not limited thereto, and one You can configure the resource pool of
  • the base station may indicate indices of OFDM symbols or slots belonging to the resource pool in units of bitmaps.
  • the system may use a formula in a set of specific slots to define slots that satisfy the formula to belong to a corresponding resource pool.
  • the base station may inform which slots among the slots for a specific time belong to a specific resource pool using a bitmap, and in this case, corresponds to the resource pool of the time resource at every specific time. Whether or not to do so may be indicated according to the bitmap.
  • a subchannel may be defined in units of resources on a frequency including a plurality of RBs.
  • a subchannel may be defined as an integer multiple of an RB.
  • the size of the subchannel may be set to be the same or different for each subchannel, and although one subchannel is generally composed of continuous PRBs, there is no limitation that it must be composed of continuous PRBs.
  • a subchannel may be a basic unit of resource allocation for a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH). Accordingly, the size of the subchannel may be set differently depending on whether the corresponding channel is the PSSCH or the PSCCH.
  • the term of a subchannel may be replaced with another term such as a resource block group (RBG) or a set of RBGs or a set of PRBs.
  • RBG resource block group
  • 'startRBSubchannel' which is higher level signaling or configuration information, may indicate the start position of a subchannel on a frequency in the resource pool.
  • a resource block which is a frequency resource belonging to a resource pool for PSSCH, may be determined in the same manner as in [Table 11] below.
  • the resource block pool is It consists of sub-channels. From here It is given by a higher layer parameters numSubchannel (The resource block pool consists subCH N sub-channels where N is given by higher layer parameter subCH numSubchannel).
  • the granularity of resource allocation in the time domain may be a slot.
  • the resource pool is exemplified as a non-contiguously allocated slot in time, but the resource pool may be continuously allocated in time, or it may be set in a symbol unit or a unit consisting of a plurality of symbols (eg, mini-slot).
  • 'startSlot' which is higher signaling or configuration information, indicates the start position of a slot in time in the resource pool
  • subframes that are time resources belonging to the resource pool for PSSCH in the LTE V2X system can be determined in the same way as in [Table 12] below.
  • a certain slot is included in the resource pool, except for at least one slot used for downlink among the slots (subframes in [Table 14]) for a specific period. is indicated, and among the slots indicated to belong to the resource pool, according to the bitmap information, which slot is actually included in the resource pool and used for sidelink transmission/reception may be indicated.
  • the sidelink control channel may be referred to as a physical sidelink control channel (PSCCH), and the sidelink shared channel or data channel may be referred to as a physical sidelink shared channel (PSSCH).
  • a broadcast channel broadcast together with a synchronization signal may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel for feedback transmission may be referred to as a physical sidelink feedback channel (PSFCH).
  • PSCCH or PSSCH may be used for feedback transmission.
  • the above-described channels may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, NR-PSSCH, and the like.
  • a sidelink may mean a link between terminals
  • a Uu link may mean a link between a base station and a terminal.
  • Information transmitted in the sidelink includes sidelink control information (SCI), sidelink feedback control information (SFCI), sidelink channel state information (SCSI), and a transport channel. It may include a sidelink shared channel (SL-SCH).
  • SCI sidelink control information
  • SFCI sidelink feedback control information
  • SCSI sidelink channel state information
  • transport channel It may include a sidelink shared channel (SL-SCH).
  • TrCH Transport channel Physical Channel
  • transport channel-physical channel mapping as shown in [Table 15] and [Table 16] below may be applied.
  • TrCH Transport channel Physical Channel
  • upper layer signaling corresponds to SL-SCH, so it may be transmitted through PSSCH, and below [Table 17] and [Table 18] Transport channel-physical channel mapping such as ] may be applied.
  • TrCH Transport channel Physical Channel
  • the receiving terminal may transmit at least one of the following additional information to the transmitting terminal together.
  • Information on the frequency domain in which the CSI is measured for example, information on the frequency domain in which the sidelink CSI-RS is transmitted. It may include an index of a subchannel, and the like.
  • rank indicator rank indicator, RI
  • channel quality indicator channel quality indicator
  • 12A is a diagram illustrating an example of groupcasting transmission in a wireless communication system according to an embodiment of the present disclosure.
  • a terminal 1220 may transmit common data to a plurality of terminals 1221a, 1221b, 1221c, and 1221d, ie, transmit data in a group casting method.
  • the terminal 1220 and the terminals 1221a, 1221b, 1221c, and 1221d may be devices that move like a vehicle.
  • at least one of separate control information eg, sidelink control information (SCI)
  • SCI sidelink control information
  • PSCCH physical sidelink control channel
  • 12B is a diagram illustrating an example of HARQ feedback transmission according to group casting in a wireless communication system according to an embodiment of the present disclosure.
  • the terminals 1221a, 1221b, 1221c, 1221d that have received common data by group casting transmit information indicating success or failure of data reception to the terminal 1220 that has transmitted the data. have.
  • Information indicating success or failure of data reception may include HARQ-ACK feedback.
  • Data transmission and feedback operations as shown in FIGS. 12A and 12B are performed based on group casting. However, according to another embodiment, the data transmission and feedback operations illustrated in FIGS. 12A and 12B may also be applied to unicast transmission.
  • FIG. 13 is a diagram illustrating an example of unicasting transmission in a wireless communication system according to an embodiment of the present disclosure.
  • a first terminal 1320a transmits data to a second terminal 1320b.
  • the data transmission direction may be reversed (eg, from the second terminal 1320b to the first terminal 1320a). Except for the first terminal 1320a and the second terminal 1320b, other terminals 1320c and 1320d cannot receive data transmitted and received in a unicast manner between the first terminal 1320a and the second terminal 1320b. . Transmission and reception of data through unicast between the first terminal 1320a and the second terminal 1320b is mapped in a preset resource between the first terminal 1320a and the second terminal 1320b, or scrambling using a preset value Or, it may be transmitted using a preset value.
  • control information related to data through unicast between the first terminal 1320a and the second terminal 1320b may be mapped to each other in a preset manner.
  • data transmission/reception through unicast between the first terminal 1320a and the second terminal 1320b may include an operation of confirming mutually unique IDs.
  • the terminals may be devices that move like a vehicle. At least one of separate control information, a physical control channel, and data may be further transmitted for unicast.
  • 14A is a diagram illustrating an example of sidelink data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 14A is a diagram illustrating a mode 1 in which a terminal receiving scheduling information from a base station transmits sidelink data.
  • a terminal 1420a (hereinafter referred to as a 'transmitting terminal') that intends to transmit data in the sidelink receives scheduling information for sidelink communication from the base station 1410 .
  • the transmitting terminal 1420a Upon receiving the scheduling information, the transmitting terminal 1420a transmits sidelink data to another terminal 1420b (hereinafter referred to as a 'receiving terminal') based on the scheduling information.
  • Scheduling information for sidelink communication is included in DCI, and the DCI may include at least one of the items shown in [Table 19] below.
  • Item Contents carrier indicator It may be used for the purpose of scheduling a sidelink of another carrier in a situation where carrier aggregation (CA) is applied.
  • the lowest index of subchannel allocation for initial transmission (lowest index) It may be used for frequency resource allocation of initial transmission.
  • Information to be included in sidelink control information - Frequency resource allocation information. It may include resource allocation or resource reservation information for initial transmission, retransmission, and subsequent N-th transmission.
  • -Time interval information between initial transmission and retransmission Information on sidelink slot structure It may include information about which slots and which symbols can be used for sidelink.
  • HARQ-ACK/CSI feedback timing information It may include timing information for transmitting HARQ-ACK or CSI feedback in the sidelink to the base station.
  • Recipient ID ID information on which terminals will receive QoS (Quality-of-Service) information such as priority Information on which priority data to transmit
  • Scheduling may be performed for one-time sidelink transmission, or may be performed for periodic transmission or semi-persistent scheduling (SPS) or configured grant transmission.
  • the scheduling method may be distinguished by an indicator included in DCI or by an RNTI or ID value scrambled to CRC added to DCI.
  • DCI for sidelink transmission may further include a padding bit (eg, 0 bit) to have the same size as other DCI formats such as DCI for downlink scheduling or uplink scheduling.
  • the transmitting terminal 1420a receives DCI for sidelink scheduling from the base station 1410, transmits a PSCCH including sidelink scheduling information to the receiving terminal 1420b, and then transmits the PSSCH, which is data corresponding to the PSCCH.
  • the PSCCH, which is sidelink scheduling information includes SCI, and the SCI may include at least one of items shown in [Table 20] below.
  • Item Contents HARQ process number HARQ process ID for HARQ related operation of data to be transmitted New data indicator (NDI) Information on whether the data currently being transmitted is new data RV (redundancy version) Information on which parity bits are sent when mapping by performing channel coding of data Layer-1 source ID ID information in the physical layer of the transmitting terminal Layer-1 destination ID ID information in the physical layer of the receiving terminal Frequency-domain resource assignment for scheduling PSSCH Frequency domain resource setting information of data to be transmitted MCS Modulation order and coding rate information QoS indication It may include priority, target latency/delay, target distance, target error rate, and the like.
  • NDI New data indicator
  • RV redundancy version
  • QoS indication It may include priority, target latency/delay, target distance, target error rate, and the like.
  • Antenna port(s) Antenna port information for data transmission DMRS sequence initialization It may include information such as an ID value for initialization of the DMRS sequence.
  • PTRS-DMRS association It may include information about PTRS mapping.
  • CBGTI It may be used as an indicator for CBG unit retransmission.
  • resource reservation Information for Reserving Resources Time gap between initial transmission and retransmission About the time interval between initial transmission and retransmission retransmission index Indicator to distinguish retransmissions Transmission format / cast type indicator (cast type indicator) Transport format or unicast/groupcast/broadcast distinction indicator zone ID Location information of the transmitting terminal NACK distance Reference indicator for determining whether the receiving terminal should transmit HARQ-ACK/NACK HARQ feedback indication It may include whether or not HARQ feedback should be transmitted or not.
  • Second SCI indication Time-domain resource assignment for scheduling PSSCH
  • Second SCI indication an indicator including mapping information of the second SCI DMRS pattern DMRS pattern (eg, symbol position to which DMRS is mapped) information
  • Control information including at least one of the items shown in Table 20 may be included in one SCI or two SCIs in order to be delivered to the receiving terminal.
  • a method of being divided into two SCIs and transmitted may be referred to as a two-stage SCI.
  • 14B is a diagram illustrating an example of sidelink data transmission without scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
  • the 14B is a diagram illustrating a mode 2 in which the terminal transmits sidelink data without receiving scheduling information from the base station.
  • This disclosure refers to a method of performing sidelink communication without scheduling information as mode 2, it may be referred to by other names.
  • the terminal 1420a desiring to transmit data in the sidelink may transmit the sidelink scheduling control information and the sidelink data to the receiving terminal 1420b by determining it by itself without scheduling from the base station.
  • the sidelink scheduling control information an SCI of the same format as the SCI used in mode 1 sidelink communication may be used.
  • the scheduling control information may include at least one of the items shown in [Table 20].
  • 15 is a diagram illustrating an example of a channel structure of a slot used for sidelink communication in a wireless communication system according to an embodiment of the present disclosure.
  • 15 is a diagram illustrating physical channels mapped to slots for sidelink communication.
  • the preamble 1502 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be mapped before the start of the slot, that is, at the end of the previous slot.
  • a PSCCH 1504 may be
  • the transmitting terminal Before transmitting a signal in the corresponding slot, the transmitting terminal transmits a signal with a preamble 1502 in one or more symbols.
  • the preamble may be used so that the receiving terminal can correctly perform automatic gain control (AGC) for adjusting the strength of the amplification when the receiving terminal amplifies the power of the received signal.
  • AGC automatic gain control
  • the preamble may or may not be transmitted depending on whether the transmitting terminal has transmitted the previous slot. That is, when the transmitting terminal transmits a signal to the same terminal in the previous slot (eg, slot #n-1) of the corresponding slot (eg, slot #n), transmission of the preamble 1502 may be omitted.
  • the preamble 1502 is a 'synchronization signal', a 'sidelink sync signal', a 'sidelink reference signal', a 'midamble', an 'initial signal', a 'wake-up signal' or the like. It may be referred to as another term having an equivalent technical meaning.
  • the PSCCH 1504 including control information may be transmitted using symbols transmitted at the beginning of the slot, and the PSSCH 1506 scheduled by the control information of the PSCCH 1504 may be transmitted.
  • PSCCH 1504 may be mapped to at least a part of SCI, which is control information. Thereafter, there may be a GAP 1508 , and a PSFCH 1510 , which is a physical channel for transmitting feedback information, may be mapped.
  • the UE may receive a preset position of a slot capable of transmitting the PSFCH.
  • Receiving in advance means that the terminal is predetermined in the process of making it, or is transmitted when accessing a sidelink-related system, or is transmitted from the base station when accessing the base station, or is transmitted from another terminal.
  • the PSFCH 1510 may be located in the last part of the slot.
  • a gap 1508 which is an empty time of a certain time, between the PSSCH 1506 and the PSFCH 1510, the terminal that has transmitted or received the PSSCH 1506 receives or prepares the PSFCH 1510 for reception or transmission (eg : Send/receive conversion).
  • a gap 1512 that is an empty period for a predetermined time may exist.
  • 16A is a diagram illustrating a first example of a distribution of a feedback channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 16A is a diagram illustrating a case in which a resource capable of transmitting and receiving a PSFCH is allocated in every slot.
  • an arrow indicates a slot of the PSFCH in which HARQ-ACK feedback information corresponding to the PSSCH is transmitted.
  • HARQ-ACK feedback information for the PSSCH 1612 transmitted in slot #n may be transmitted in the PSFCH 1614 of slot #n+1. Since the PSFCH is allocated to every slot, the PSFCH may correspond to a slot including the PSSCH 1:1.
  • the period of a resource capable of transmitting and receiving PSFCH is configured by a parameter such as 'periodicity_PSFCH_resource'
  • periodicity_PSFCH_resource indicates 1 slot.
  • the period may be set in msec units, and the period may be indicated by a value allocated to every slot according to the subcarrier interval.
  • 16B is a diagram illustrating a second example of distribution of a feedback channel in a wireless communication system according to an embodiment of the present disclosure.
  • FIG. 16B is a diagram illustrating a case in which resources are allocated to transmit/receive PSFCH in every 4 slots.
  • an arrow indicates a slot of the PSFCH in which HARQ-ACK feedback information corresponding to the PSSCH is transmitted.
  • the last slot among the four slots may include the PSFCH.
  • only the last of the next 4 slots contains the PSFCH. Accordingly, HARQ-ACK feedback for the PSSCH 1622a of slot #n, the PSSCH 1622b of the slot #n+1, the PSSCH 1622c of the slot #n+2, and the PSSCH 1622d of the slot #n+3
  • the information may be transmitted on the PSFCH 1624 in slot #+4.
  • the slot index may be an index for slots included in the resource pool. That is, the four slots are not physically consecutive slots, but may be consecutively listed slots among slots included in a resource pool (or slot pool) used for sidelink communication between terminals.
  • the reason that the HARQ-ACK feedback information of the PSSCH transmitted in the 4th slot is not transmitted in the PSFCH of the same slot is because the processing time is not short enough for the UE to finish decoding the PSSCH transmitted in the corresponding slot and transmit the PSFCH in the same slot. have.
  • the number of HARQ-ACK feedback bits included in the PSFCH and which PSSCH to include the HARQ-ACK bits may be determined based on at least one or a combination of two or more of the items shown in [Table 21] below.
  • the terminal receiving the PSSCH in slot #n uses the smallest x among integers greater than or equal to K when a resource capable of transmitting the PSFCH is set or given in the slot #n+x, the HARQ-ACK feedback of the PSSCH is Information is transmitted using the PSFCH of slot #n+x.
  • K may be a value preset by the transmitting terminal or a value set in a resource pool through which the corresponding PSSCH or PSFCH is transmitted.
  • each terminal may exchange its capability information with the transmitting terminal in advance.
  • K may be determined according to at least one of a subcarrier interval, a terminal capability, a setting value with a transmitting terminal, or a resource pool setting.
  • the transmitting terminal may select a resource after sensing, without pre-reserving a resource for initial transmission of one TB.
  • resources may be reserved using SCI for another TB, and this function may be enabled or disabled by (pre-)configuration (ie, transmission of TB1).
  • SCI1 for controlling TB2 may reserve a resource for initial transmission of TB2). For example, when the corresponding function is enabled, reservation interval information is set in SCI1 when the previous TB (TB1) is transmitted, and the same frequency resource as the resource selected for transmitting the previous TB (TB1) is set as the reservation interval. After the interval may be reserved for the initial transmission of TB2.
  • the method of reserving the initial transmission resource in addition to the method of using SCI to control the aforementioned other TB, the method of reserving the initial resource for the corresponding TB using SCI through standalone PSCCH transmission This can be considered.
  • retransmission resources for one and the same TB may be reserved using SCI at the time of initial transmission.
  • the SCI may include time gap information and frequency resource allocation information between initial transmission and retransmission for the same TB and may be transmitted.
  • the first method when the same frequency allocation size for the initial transmission and retransmission resource for the same TB is always supported (the first method) and when the frequency allocation size for the initial transmission and the retransmission resource is allowed to be different (the second method) can be considered.
  • the case where the frequency allocation size for initial transmission and retransmission resources is allowed to be different has the advantage of more flexible resource selection, but in SCI including information on retransmission resources, it is This may become very complicated, and the performance of SCI may decrease (eg, coverage of SCI may decrease or receive error rate may increase) as the number of bits transmitted in SCI increases. Contrary to this, when the same frequency allocation size for initial transmission and retransmission resources is always supported, the flexibility of resource allocation is small, but it can be simplified to indicate information on retransmission resource reservation information in SCI. There is an advantage in that the performance of the SCI can be guaranteed by reducing the number of bits transmitted through the SCI. Therefore, each of the two methods described above has advantages and disadvantages.
  • the initial transmission resource is fixed to X sub-channels and transmitted, and the retransmission resource is transmitted through one or more sub-channels.
  • the retransmission resource is transmitted through one or more sub-channels.
  • a method of limiting to one subchannel as a value of the number of subchannels X for an initial transmission resource (ie, a method of limiting X to 1) may be considered.
  • the value of X is not always limited to 1, and the value of X may be variously determined.
  • PSCCH and PSSCH are transmitted on X subchannels.
  • SCI transmitted on PSCCH may reserve retransmission resources, in which case the subchannel for the retransmission resource.
  • Y subchannels may be allocated.
  • the same frequency allocation size for the initial transmission and retransmission resource for the same TB is always supported (hereinafter, the first method) and the initial transmission resource is fixed to X sub-channels
  • the second method which method is used among the two methods is indicated by 1-bit information in the SCI.
  • This is to enable interpretation of resource reservation information included in the SCI.
  • resource reservation information included in SCI is proposed in more detail. The following is an example of a method of indicating reservation information for initial transmission and one retransmission resource for a corresponding TB.
  • 17A and 17B are diagrams illustrating an example of a method in which resource allocation of PSSCH is performed in units of subchannels according to an embodiment of the present disclosure.
  • FIG. 17A, 17a-10 shows a method in which a PSCCH and a PSSCH are multiplexed.
  • the PSCCH may be transmitted in a subchannel corresponding to the lowest subchannel index in a subchannel allocated for the PSSCH.
  • a method in which the PSCCH is always included in a subchannel and transmitted in the NR sidelink may be considered. In this case, the method of transmitting the PSCCH in the subchannel may be determined according to the size of the configured subchannel.
  • a method of repeatedly transmitting the PSCCH in the PSSCH region according to the size of the subchannel may be considered (17a-40).
  • a method in which the PSCCH is included in a subchannel and transmitted using the first method in which the same frequency allocation size for initial transmission and retransmission resource for the same TB is always supported is shown in FIGS. 17a-20 and 17a- 30 is shown.
  • the initial transmission resource is transmitted by being fixed in X sub-channels
  • the PSCCH is included in the sub-channel and transmitted using the second method in which the retransmission resource can be transmitted through one or more sub-channels. Methods are shown at 17b-50 and 17b-60 of FIG. 17b.
  • the UE may receive startRB-Subchannel, sizeSubchannel, and numSubchannel configuration as frequency configuration information for the resource pool.
  • startRB-Subchannel sizeSubchannel
  • numSubchannel configuration as frequency configuration information for the resource pool.
  • the LsubCH indicates the length of a subchannel allocated to the PSSCH
  • nsubCHstart and nsubCHstart (RE) indicate the start position of a subchannel allocated to the PSSCH for initial transmission and retransmission.
  • nsubCHstart and nsubCHstart (RE) information may be included in the SCI.
  • the resource reservation information is indicated through SCI.
  • An example will be described. Specifically, the following method is a chain reservation method for indicating resource allocation for the current transmission and the next retransmission, and resource reservation information for the PSSCH indicated by the SCI in the slot tn allocated to the original pool may be determined as follows:
  • X indicates the length of a subchannel allocated to the PSSCH for initial transmission
  • LsubCH indicates the length of a subchannel allocated to the PSSCH during retransmission.
  • nsubCHstart and nsubCHstart (RE) indicate start positions of subchannels allocated to the PSSCH for initial transmission and retransmission
  • nsubCHstart and nsubCHstart (RE) information may be included in the SCI.
  • the start position nsubCHstart of the subchannel allocated for the PSSCH for initial transmission is not separately indicated by the SCI, but is replaced with the value of the PSCCH resource m and may be used ( 17b). This may be supported when the PSCCH is capable of one-to-one connection in a region in which the PSSCH is transmitted.
  • the Resource Indication Value may be defined as follows.
  • N subCH represents the total number of subchannels configured in the resource pool by the upper layer.
  • the transmitting terminal determines the resource to transmit the PSSCH through the above-described method such as channel occupancy and channel reservation (18-01).
  • the transmitting terminal determines scheduling parameters to be included in the SCI based on the determined resource to transmit the PSSCH.
  • the scheduling parameters may include frequency and time resources of PSSCH, MCS, RV, NDI, H17RQ process ID, and the like.
  • the transmitting terminal determines values of the bit field of the second control information based on the determined scheduling parameter, and determines a transmission resource for where to map the second control information (18-03).
  • the transmitting terminal determines the bit field value of the first control information based on the transmission resource to which the scheduling parameter of the PSSCH, the bit field value of the second control information, and the second control information are mapped (18-05). This is because the first control information may include information for decoding the second control information.
  • the transmitting terminal may determine a transmission resource to which the first control information is mapped based on the transmission resource to which the scheduling parameter of the PSSCH, the bit field value of the second control information, and the second control information are mapped. Based on the determined information, the transmitting terminal transmits the first control information, the second control information, and the PSSCH (18-07).
  • 19 is a flowchart illustrating a method for a receiving terminal to sequentially decode first control information and second control information, and to decode a PSSCH based on the first control information according to an embodiment of the present disclosure.
  • the receiving terminal attempts to decode the first control information based on preset information ( 19-01).
  • the receiving terminal determines whether to decode the second control information according to the bit field value of the first control information successfully decoded, and if decoding of the second control information is required, to which resource the second control information is mapped and performs decoding (19-03).
  • the reason for determining whether to decode the second control information is that, in a specific transmission type or transmission mode, decoding of the PSSCH may be possible only by decoding the first control information.
  • the receiving terminal determines the PSSCH transmission resource and other scheduling information based on the bit field values of the decoded first control information (SCI 1) and the second control information (SCI 2) (19-05).
  • the receiving terminal performs PSSCH decoding using the identified scheduling information and performs necessary subsequent operations (19-07).
  • the terminal after the terminal successfully decodes the first control information, it may not necessarily be necessary to decode the second control information. Successful decoding of the control information may indicate that CRC checking has been successful.
  • 20 is a diagram illustrating an example in which a frequency domain is divided in units of subchannels in a given resource pool according to an embodiment of the present disclosure, and resource allocation for data transmission is allocated in units of subchannels.
  • the number of subchannels in the resource pool is Nsubchannel.
  • One subchannel may consist of one or more PRBs, and Nsubchannel may be a value set or preset in the resource pool, or a value calculated by a specific parameter.
  • data may be transmitted in PSSCH, and resource allocation for data transmission may indicate a resource region used for PSSCH mapping.
  • control information transmitted in slot n 1 may include resource allocation information for initial transmission and retransmission No. 1 have. This may be time domain resource information for slot n 2 , or frequency domain information for slot n 1 and slot n 2 . If it is assumed that the number of subchannels in the frequency domain used for initial transmission and retransmission is the same, the information on the first subchannel to which the PSSCH mapping in the corresponding slot starts is determined from the mapping position of the corresponding control information transmitted in the same slot.
  • control information transmitted in the initial transmission needs to include the number of subchannels used for PSSCH mapping and information on the first subchannel to which the PSSCH for retransmission is mapped.
  • a bit field having the following size may be used in the control information.
  • the bitfield of this size may be for indicating the number of subchannels to which the PSSCH is mapped and the position of the start subchannel of the retransmission PSSCH, may indicate the number of possible combinations of the number of subchannels to which the PSSCH is mapped and the starting subchannel position of the retransmission PSSCH.
  • Using log with a base of 2 may be for calculating the number of bits to indicate possible cases of the number of cases. Is The smallest integer among larger integers may be indicated, and this may be used to indicate the size of a required bitfield as an integer.
  • a bit field of the following size (or a size smaller or larger than this within several bits) may be used for control information.
  • the number of cases of the starting subchannel position of the PSSCH transmitted in the slot n 3 and the slot n 4 is Since it can be expressed as , the size of the bit field can be determined as in Method 1.
  • Method 2 may be a method of transmitting information on the start subchannel position of the PSSCH transmitted in slot n 3 and in slot n 4 as independent bits.
  • Method 3 may be a method of transmitting the start subchannel position of the PSSCH transmitted in slot n 3 and in slot n 4 together with several bits.
  • the present disclosure describes embodiments for performing a method for transmitting and receiving sidelink data. More specifically, it provides a slot structure for sidelink transmission, and a method and apparatus for transmitting and receiving data in the slot structure.
  • a first embodiment of the present disclosure provides a structure of a slot for transmitting and receiving a sidelink control channel and data.
  • a received signal is passed through an amplifier to amplify the strength of the signal, and then signal processing is performed, and an amplifier capable of varying the degree of amplifying the signal may be used.
  • an input or output range having linearity between an input and an output may be defined. If the amplification is performed by increasing the amplification level too much, the output may be set to a range out of the linearity, and the received signal may be deformed, and such deformation may result in deterioration of the reception performance.
  • the degree of amplification may be set to operate in a section having linearity between the input and output of the amplifier.
  • the degree of amplification is set too low, the reception performance may not be secured because the reception signal may not be sufficiently amplified. Therefore, the degree of amplification can be continuously automatically adjusted to maximize amplification in the section with linearity between the input and output of the amplifier. This is called automatic gain control (AGC).
  • AGC automatic gain control
  • the terminal can find an appropriate degree of amplification by performing AGC, and it takes some time to find the appropriate degree of amplification, and this required time is called AGC training time.
  • the signal received during such AGC training time may not be used for the reception of actual control and data signals, and the AGC training time may be determined according to the setting of the initial value of the degree of amplification for performing AGC.
  • the AGC training time may be required for every signal reception. As the AGC training time required for the receiving terminal is reduced, the received signal section that the terminal can use for signal processing increases, so the reception performance can be improved.
  • the transmitting terminal may transmit the preamble signal in one or more symbols before transmitting the sidelink control channel and data.
  • the preamble signal may be used so that the receiving terminal can correctly perform automatic gain control (AGC) for adjusting the strength of the amplification when the receiving terminal amplifies the power of the received signal.
  • a PSCCH including control information may be transmitted in early symbols of a slot, and a PSSCH scheduled by the control information of the PSCCH may be transmitted.
  • a part of SCI, which is control information may be mapped to the PSSCH and transmitted.
  • the preamble signal for performing AGC may be separately transmitted, but the sidelink channel and signal to be transmitted in the second symbol are copied and transmitted in the first symbol, and the receiver performs AGC using this It may also be possible to
  • the position of the symbol at which the DMRS is transmitted described in this embodiment may be applied by combining patterns of different positions according to the allocated length of the PSSCH.
  • the allocated length of the PSSCH may be the number of symbols used for PSSCH transmission including DMRS excluding AGC symbols.
  • a PSSCH may be mapped to a DMRS symbol according to availability of available resources.
  • a part of control information may be mapped to a DMRS symbol according to whether a resource is available or a resource of a PSSCH.
  • the DMRS pattern provided in this embodiment may be a physically absolute symbol position within a slot, but may also be a relative symbol position depending on an applied example.
  • the position of the DMRS symbol may be changed according to the positions of symbols used for sidelink in the slot. That is, when p is the index of the first symbol of the PSCCH, the position of the DMRS symbol provided in this embodiment may be given as a relative offset value from p.
  • 21 is a diagram illustrating a DMRS of a sidelink control channel and data when the first three symbols are used for downlink in a slot according to an embodiment of the present disclosure.
  • This embodiment provides an example of maximally reusing the relative position of the downlink DMRS symbol, that is, the DMRS symbol of the PDSCH in the NR system.
  • this embodiment provides an example of maximally reusing the relative positions of uplink DMRS symbols, ie, DMRS symbols of PUSCH, in the NR system.
  • the DMRS symbol of the above-mentioned PUSCH may vary depending on the PUSCH type of the NR system. In the case of PUSCH type A, the position of the DMRS symbol is the same as the position of the DMRS symbol of the downlink PDSCH, and in the case of PUSCH type B The position of the DMRS symbol is different from the position of the DMRS symbol of the downlink PDSCH.
  • 22A, 22B, 22C and 22D are diagrams each showing a pattern including one, two, three, and four DMRS symbols according to an embodiment of the present disclosure.
  • Each of the patterns shown in FIGS. 22A to 22D may be patterns used according to parameter values such as dmrs_number or dmrs-AdditionalPosition and the number of symbols used for PSSCH mapping.
  • dmrs-AdditionalPosition pos2 (dmrs-AdditionalPosition may mean the number of additional symbols other than 1, for example, pos2 may mean the total number of 3 DMRS symbols. That is, posX is the total number of X +1 symbol), one of the DMRS patterns shown may be selected and used according to the number of PSSCH symbols from among the DMRS patterns shown in FIG. 22C.
  • the position of the first symbol of the PSCCH which is a control channel transmitted in the slot of the sidelink, may mean the second symbol used as the sidelink in the slot.
  • a parameter value such as dmrs_number or dmrs-AdditionalPosition may be a value transmitted from control information (SCI) or first stage control information (1st stage SCI).
  • a parameter value such as dmrs_number or dmrs-AdditionalPosition may be a value set in the resource pool, or may be a value indicated by SCI among values set in the resource pool.
  • a 2-bit indicator is transmitted in SCI, and the 2-bit indicator may indicate a value of dmrs-AdditionalPosition.
  • FIGS. 23A, 23B, and 23C are diagrams illustrating a modified example of a DMRS pattern according to an embodiment of the present disclosure.
  • the patterns shown in FIGS. 22A to 22D may be further modified and supported in the sidelink.
  • the DMRS pattern of FIG. 22B including two symbol DMRSs in the sidelink may be modified and applied as shown in FIG. 23A.
  • FIG. 22c may be modified and used as a DMRS pattern including 3 symbol DMRS in the sidelink
  • FIG. 22d may be modified and used as a DMRS pattern including 4 symbol DMRS in the sidelink.
  • the DMRS patterns of FIGS. 22C and 22D may be modified and used in FIGS. 23B and 23C , respectively.
  • some or a combination of some may be used.
  • different possible positions may be applied according to subcarrier spacing.
  • a part or a combination of parts may be used differently depending on the subcarrier spacing.
  • the position of the symbol at which the DMRS is transmitted described in this embodiment may be applied by combining patterns of different positions according to the allocated length of the PSSCH.
  • the allocated length of the PSSCH may be the number of symbols used for PSSCH transmission including DMRS excluding AGC symbols.
  • a PSSCH may be mapped to a DMRS symbol according to availability of available resources.
  • a part of control information may be mapped to a DMRS symbol according to whether a resource is available or a resource of a PSSCH.
  • the DMRS pattern provided in this embodiment may be a physically absolute symbol position within a slot, but may also be a relative symbol position depending on an applied example. That is, the position of the DMRS symbol may be changed according to the position of the symbols used for sidelink in the slot. For example, when p is the index of the first symbol of the PSCCH, the position of the DMRS symbol provided in this embodiment may be given as a relative offset value from p.
  • FIG. 21 may be an embodiment in which a part of FIG. 23A is applied when the first three symbols in a slot are used for downlink.
  • Embodiment 1-1 provides a method and apparatus for mapping a DMRS for decoding a PSSCH and also mapping a PSSCH in sidelink data transmission/reception.
  • mapping resource locations are different according to PSSCH DMRS Type 1 and Type 2 .
  • One cell means one RE, and the number may be a layer number or an antenna port number.
  • DMRSs corresponding to layers 2 and 3 or antenna ports 2 and 3 are mapped to the 1, 3, 5, 7, 9, and 11th REs from the top, 2, DMRSs corresponding to layers 0 and 1 or antenna ports 0 and 1 may be mapped to the 4th, 6th, 8th, 10th, and 12th REs. Since only two layer transmissions can be supported in the sidelink, if DMRS is used according to a predetermined number, not all REs of one symbol are used for DMRS mapping.
  • the operation may be different depending on how the CDM group is used.
  • One CDM group in the above means, for example, in the case of type 1 in FIG. 24, REs marked 0/1 may be one CDM group, and REs marked 2/3 may be another CDM group. .
  • REs marked 0/1 may be one CDM group
  • REs marked 2/3 may be another CDM group.
  • REs marked 0/1 are one CDM group
  • REs marked 2/3 are another CDM group
  • REs marked 4/5 are another CDM group. If two CDM groups are used and one port or two ports are transmitted, the PSSCH may be transmitted in an empty state without data (PSSCH) mapped to another CDM group. If one CDM group is used and one port or two ports are transmitted, data (PSSCH) may be mapped to another CDM group and the PSSCH may be transmitted.
  • DMRS REs may not overlap even if PSSCHs and DMRSs are transmitted in the same PRB. That is, when both terminal A and terminal B transmit one port and use different CDM groups, terminal B transmits DMRS in the 1st, 3rd, 5th, 7th, 9th, and 11th REs, and terminal A It may be a method of transmitting DMRS in the 2nd, 4th, 6th, 8th, 10th, and 12th REs.
  • a CDM group may be determined between transmitting and receiving terminals according to at least one of the following methods.
  • the CDM group may be determined according to the CRC ratio value of the PSCCH. That is, if the CRC bit value is an odd number when converted to a decimal number, PSSCH DMRS is transmitted from the first CDM group. have. That is, the CDM group may be determined according to the LSB or MSB value of the CRC bit. If the LSB (or MSB, or specific n-th bit value) value of the CRC bit is 0, PSSCH DMRS is transmitted in the first CDM group, and if the LSB (or MSB, or specific n-th bit value) value of the CRC bit is 1, two PSSCH DMRS may be transmitted in the th CDM group.
  • a CDM group may be determined according to the lowest (or highest) PRB index value through which the PSCCH is transmitted. That is, if the lowest (or highest) PRB index value through which the PSCCH is transmitted is odd, the PSSCH DMRS is transmitted in the first CDM group, and the lowest (or highest) PRB index value through which the PSCCH is transmitted is even. PSSCH DMRS may be transmitted in the th CDM group.
  • Whether the PSSCH is mapped and transmitted to REs to which DMRS is not mapped in the symbol in which the DMRS is transmitted may be determined according to the number of CDM groups. That is, in the case of DMRS type 1, when the number of CDM groups is 1, the PSSCH is mapped to the remaining CDM groups and transmitted. When the number of CDM groups is 2, the PSSCH is not mapped to the REs corresponding to the remaining CDM groups. . In case of DMRS type 2, if the number of CDM groups is 1, PSSCH is mapped to the remaining CDM groups and transmitted. If the number of CDM groups is 2 or 3, the REs corresponding to the remaining corresponding CDM groups are PSSCH is not mapped.
  • the second embodiment provides a method and apparatus for mapping second control information (eg, two-step SCI) to a resource.
  • second control information eg, two-step SCI
  • the method 29 is a diagram illustrating a method of transmitting second control information in a PSSCH according to an embodiment of the present disclosure.
  • the method may be referred to as a method in which the second control information is piggybacked to the PSSCH.
  • the method is a method in which the second control information is encoded and mapped using a channel coding method different from the SL-SCH included in the PSSCH.
  • the transmitting terminal transmits the PSCCH and the PSSCH to the receiving terminal, and in the PSCCH, the first control information may be mapped and delivered to the receiving terminal.
  • the transmitting terminal maps and transmits the first control information using the PSCCH, and transmits the PSSCH according to the PSSCH scheduling information included in the first control information.
  • the transmitting terminal maps the second control information to the resource region of the PSSCH.
  • 29 is a diagram illustrating an example in which second control information is mapped to a PSSCH.
  • 29( a ) is an example in which the second control information is mapped to the frontmost part of the slot so that the second control information can be received as quickly as possible.
  • 29(b) is an example in which the second control information is mapped to the earliest part of the slot so that the second control information can be received as quickly as possible, and the last symbol to which the second control information is mapped is widely mapped in the frequency domain. This may be because the purpose of the drawings is to enable the receiving terminal to decode the second control information as quickly as possible.
  • 29(c) is an example in which the second control information is mapped to the front part immediately after the DMRS of the PSSCH is mapped so that the second control information can be received as soon as possible after the DMRS of the PSSCH is received.
  • the second control information is mapped to the front part as soon as possible after the DMRS of the PSSCH is mapped so that the second control information can be received as soon as possible after the DMRS of the PSSCH is received.
  • This is an example of widely spread mapping in the frequency domain.
  • 29(e) is an example in which the DMRS of the PSSCH is mapped to the front part immediately after the DMRS is mapped so that the second control information can be received as soon as possible from the same symbol as the DMRS of the PSSCH.
  • the DMRS of the PSSCH is mapped to the front part as soon as possible so that the second control information can be received as quickly as possible from the same symbol as the DMRS of the PSSCH.
  • This is an example of widely spread mapping in the frequency domain.
  • 30 and 31 are diagrams illustrating different examples to which second control information is mapped according to an embodiment of the present disclosure.
  • 30 is a diagram illustrating an example in which the first symbol of DMRS for PSSCH is located in the fourth symbol of the slot, and may be a diagram corresponding to (a), (b), (c), and (d) of FIG. 29, respectively.
  • 31A is a diagram illustrating an example of mapping second control information to all symbols to which PSSCH is mapped in a slot.
  • 31( b ) is a diagram illustrating an example in which the second control information is mapped back and forth to the DMRS of the PSSCH, which secures good channel measurement performance by arranging the second control information near the DMRS to decode the second control information You will be able to increase your reliability.
  • the receiving terminal When the receiving terminal decodes the PSCCH to obtain the first control information, information on the resource to which the PSSCH is mapped and other scheduling information can be obtained.
  • the other scheduling information may include an MCS. Accordingly, when the receiving terminal obtains the first control information, it can determine the resource region and MCS information of the PSSCH, and decode the second control information mapped to the PSSCH.
  • the number of bits in which the second control information is coded using channel coding may be calculated as follows.
  • R is a coding rate of the PSSCH
  • Qm is a modulation order
  • R and Qm may be obtained from MCS information included in the first control information for scheduling the PSSCH.
  • the amount of the mapped resource and the mapping resource of the second control information, or the number of bits in which the second control information is coded is the setting of the resource pool, or PC5- It may be determined based on the RRC configuration or the first control information. For example, similarly to the example provided in the second embodiment, when the second control information is mapped to the PSSCH, the number of bits or symbols in which the second control information is coded using channel coding may be calculated as in Equation 2 below.
  • Equation 2 may be applied by being replaced with [Equation 3] as follows. From above When the second control information is mapped, the RE (that is, the second control information is mapped If there is an RE) that does not exist, it is a variable determined so that the second control information is mapped to all remaining REs of the corresponding RB.
  • the RE that is, the second control information is mapped If there is an RE that does not exist, it is a variable determined so that the second control information is mapped to all remaining REs of the corresponding RB.
  • Kr may be the size of the r-th codeblock of the TB included in the SL-SCH, that is, the PSSCH, and Kr may include the length of the CRC, but may be applied not to be included.
  • C_ ⁇ SC-SCL ⁇ may be the number of code blocks included in the TB included in the SL-SCH, that is, the PSSCH. from above may be the SL-SCH, that is, the size of a TB included in the PSSCH, TBS. That is, in the above SL-SCH, that is, the size of TB included in PSSCH, may be replaced with TBS.
  • 36 is a diagram illustrating an example in which second control information is mapped to all remaining REs when there are REs remaining in an RB to which second control information is mapped according to an embodiment of the present disclosure.
  • R is a coding rate of the PSSCH
  • Qm is a modulation order
  • R and Qm may be obtained from MCS information included in the first control information for scheduling the PSSCH.
  • the size of the bit field to indicate may be determined according to the number of values set in the resource pool. That is, there are N values in the resource pool. If it is set for , the size of the bit field is etc.
  • N may be equal to a function of N. from above is the number of bits of the second control information, is the number of CRC bits added to the second control information before channel coding. from above may be a parameter that determines the amount to which the second control information is mapped. from above The value may be transmitted in the first control information, or may be a value preset in the resource pool.
  • the receiving terminal decodes the PSCCH to obtain the first control information, and The value may be found, and the second control information may be decoded based on this. Thereafter, the receiving terminal may know the resource and scheduling parameter to which the PSSCH is mapped according to bitfield values included in the first control information and the second control information, and may perform decoding of the PSSCH based on the information. from above may be the number of symbols allocated to the corresponding PSSCH, but may be determined in the following way.
  • Method 1 is the number of symbols that do not overlap with the PSCCH among symbols allocated to the corresponding PSSCH except for AGC symbols, and may optionally include DMRS symbols.
  • 32 and 33 are diagrams illustrating an embodiment of a symbol allocated to a PSSCH according to an embodiment of the present disclosure.
  • the number of symbols from symbol 4 to symbol 12. can be 9.
  • the number of symbols from symbol 4 to symbol 6, can be 3.
  • - Method 2 is the number of symbols allocated to the PSSCH after the first symbol of the DMRS for the PSSCH and thereafter among the symbols allocated to the corresponding PSSCH except for the AGC symbol, and may optionally include DMRS symbols. That is, in the example of FIG. 32 is the number of symbols from symbol 4 to symbol 12. can be 9. In the example of FIG. 33 is the number of symbols from symbol 1 to symbol 6, can be 6.
  • - Method 3 is the number of symbols that do not overlap the PSCCH among symbols allocated to the corresponding PSSCH except for AGC symbols, and DMRS symbols may be selectively excluded. That is, in the example of FIG. 32 is the number of symbols from symbol 4 to symbol 12, excluding symbols 4 and 10. can be 7. In the example of Figure 33 is the number of symbols excluding symbol 5 from symbol 4 to symbol 6, can be 2.
  • a region to which at least one of PSCCH, DMRS, PT-RS, etc. is mapped may be excluded (from the number of REs).
  • the values of the variables may be determined or determined as follows.
  • - is the number of the 2 nd -stage SCI bits.
  • - is the number of CRC bits for the 2 nd -stage SCI, which is 24 bits.
  • - is indicated in the corresponding 1 st -stage SCI.
  • - is the scheduled bandwidth of PSSCH transmission, expressed as a number of subcarriers.
  • - is the number of subcarriers in OFDM symbol that carries DMRS, in the PSSCH transmission.
  • - is the number of subcarriers in OFDM symbol that carries PT-RS, in the PSSCH transmission.
  • - - is the number of vacant resource elements in the resource block to which the last coded symbol of the 2 nd -stage SCI belongs.
  • - is the coding rate as indicated by "Modulation and coding scheme" field in SCI format 1-A.
  • - is configured by higher layer parameter sl-Scaling .
  • the second control information may be mapped from the first DMRS symbol of the corresponding slot.
  • FIG. 34 is a diagram illustrating an embodiment in which second control information is mapped according to an embodiment of the present disclosure. It may be possible to map the second control information as shown in FIG. 34 .
  • FIG. 35 is a diagram illustrating a case in which a resource for mapping second control information is insufficient according to an embodiment of the present disclosure. Specifically, according to Equation 2, FIG. 35 It is a diagram illustrating that resources for mapping the actual second control information may be insufficient when . That is, calculated in Equation 2 above It may be a situation that occurs when is larger than the actual number of mappable symbols.
  • the transmitting terminal selects among the candidate values set as higher by selecting may be determined and the second control information may be transmitted.
  • the transmitting terminal is more than the number of symbols to which the second control information can be mapped. so as not to grow You can only choose between. That is, the number of symbols to which the second control information can be mapped to make it bigger can be excluded from not being selected (that is, it can be excluded from the candidate value).
  • a terminal receiving the PSCCH, second control information, and PSSCH , and the number of symbols to which the second control information can be mapped In the smaller case, it may be a method of treating this case as an error. In this case, the receiving terminal may not attempt to decode the second control information. In this method, that is, the receiving terminal may omit decoding of control information and data information. In addition, in order to determine whether decoding is omitted, it may be determined based on the actual coding rate of the actual mapped data and control information. For example, if the actual coding rate is equal to or greater than a predetermined value, decoding may be omitted, and a value such as 0.95 or 0.9 may be used as the predetermined value.
  • the terminal selects from among the candidate values set as higher When selecting , the terminal is more than the number of symbols to which the second control information can be mapped. so as not to grow can only be considered as set.
  • base station or In the process of setting the candidate value the number of symbols to which the second control information can be mapped is greater than so as not to grow can only be set. That is, the base station or the In the process of setting the candidate value, the number of symbols to which the second control information can be mapped is greater than to make it smaller may not be set.
  • Method 4 Based on the number of resources (or number of symbols) available for the second control information can be decided
  • the number of bits of the second control information ( ), the number of CRC bits ( ), coding rate of PSSCH ( ), modulation order ( ), a first value determined by at least some parameters of and Based on a second value determined based on , and a third value determined based on the number of resources (or number of symbols) available for the second control information can be decided
  • said The value may be determined based on a minimum value of the first, second, and third values or a predefined rule. as a specific example It may be a method of using [Equation 4] as follows in the process of calculating . This may be determined based on the number of resources available for the second control information.
  • the number of symbols to which the second control information can be mapped or a value corresponding thereto may be the number of symbols to which the second control information can be mapped or a value corresponding thereto.
  • it may be the number of REs to which the PSSCH or the second control information can be mapped from the first DMRS symbol among resources allocated to the PSSCH, or a value corresponding thereto.
  • the calculation method may be used to calculate the number of resources to which the second control information is mapped. According to another embodiment provided in the present disclosure, in the process of calculating TBS, the method of calculating can be used to calculate values such as
  • the third embodiment provides a method and apparatus for a terminal to transmit and receive control information or data in a sidelink.
  • a method and apparatus for mapping the same modulation symbol to two layers are provided.
  • sequence may use the sequence given in Section 5.2.1 of TS38.211 (Based on Release 16), one of the 5G NR standards.)
  • the scramble method is Instead of applying different scrambling methods depending on the value, The same scrambling method was applied regardless of the value.
  • modulation is performed using one of QPSK, 16QAM, 64QAM, and 256QAM modulation schemes. (Here, the modulation order of the modulation method are 2, 4, 6, 8, respectively, to be.)
  • Layer mapping is the number of layers can be performed as described in section 7.3.1.3 of TS38.211 for can be expressed as
  • the vector block Precoding may be performed according to 6.3.1.5 of TS38.211 for is equal to the identity matrix, this is accomplished
  • mapping to the virtual resource block may be performed as follows.
  • Corresponding resource elements in the corresponding physical resource blocks are not used for transmission of the associated DM-RS, PT-RS, CSI-RS, or PSCCH.
  • a detailed mapping operation may be performed through the following two-step process.
  • a process of mapping from virtual resource blocks to physical resource blocks may be performed according to a mapping method that does not apply interleaving (non-interleaved mapping).
  • virtual resource block n may be mapped to physical resource block n.
  • mapping operation may be as follows.
  • 2 nd -stage SCI (second control information) from the complex-valued symbol must be the index k 'on the high-cost VRB (virtual resource block) allocation, and the index corresponding to the bit of the starts from the first PSSCH symbol transmitting the associated DM-RS (first, the complex-valued symbols corresponding to the bit for the 2 nd -stage SCI shall be in increasing order of first the index) over the assigned virtual resource blocks and then the index , starting a the first PSSCH symbol carrying an associated DM-RS)
  • 2 nd -stage SCI complex-valued symbol that does not correspond to a bit of the (second control information) will be high since the index k 's on the VRB (virtual resource block) allocation, and the index is the position given by [6, TS 38.214].
  • the resource element used for the 2 nd -stage SCI in the first stage is not used for mapping in this stage (secondly, the complex-valued modulation symbols not corresponding to the 2 nd -stage SCI shall be in in increasing order of first the index over the assigned virtual resource blocks, and then the index with the starting position given by [6, TS 38.214].
  • Resource elements used for 2 nd -stage SCI in the first step shall not be used for mapping in this step.
  • the resource element used for the PSSCH in the first OFDM symbol must be replicated in the OFDM symbol immediately preceding the first OFDM symbol in the mapping (The resource elements used for the PSSCH in the first OFDM symbol in the mapping operation) above shall be duplicated in the OFDM symbol immediately preceding the first OFDM symbol in the mapping.)
  • the fourth embodiment provides a method and apparatus for considering the second control information in the process of calculating a transport block size (TBS).
  • TBS transport block size
  • the TBS calculation method in the sidelink may be performed in the following way.
  • the TBS may be determined based on the resource to which the PSSCH is allocated, the MCS, and control information.
  • the total number of REs allocated for PSSCH (total number of REs allocated for PSSCH) ) as a parameter to be considered when calculating, it means the number of coded modulation symbols used for the second control information.
  • the resource to which the second control information is mapped in the initial transmission and the retransmission for any one TB may vary depending on the presence and the resource of the PSSCH DMRS, CSI-RS, or PT-RS.
  • TBS is calculated differently by .
  • the It may be necessary to calculate the method for calculating the TB in the same way in the initial transmission and retransmission of the TB. Therefore, using the following methods It may be possible to calculate It may be possible to apply a combination of one or more of the following methods.
  • DMRS of the PSSCH is transmitted in a specific symbol in the process of calculating . That is, it can be assumed that transmission is performed using a specific DMRS pattern and number of symbols.
  • the above assumption may be different from the actual number of PSSCH DMRS symbols and symbol positions. For example, 3 symbols are used for PSSCH DMRS that is actually transmitted,
  • PSSCH DMRS is transmitted in 2 symbols.
  • the number and pattern of PSSCH DMRS symbols assumed in the calculation may be set by higher signaling or one of the configured PSSCH DMRS patterns. For example, if the DMRS pattern ⁇ 1,2,3 ⁇ is set as upper signaling (ie, 1 symbol, 2 symbols, 3 symbols), using the smallest value 1 It may be possible to calculate It may be possible to calculate
  • TBS may be determined based on the number of resources (or the number of symbols) available for the second control information.
  • the number of bits of the second control information ( ), the number of CRC bits ( ), coding rate of PSSCH ( ), modulation order ( ), a first value determined by at least some parameters of and Based on a second value determined based on , and a third value determined based on the number of resources (or number of symbols) available for the second control information can be decided
  • said The value may be determined based on a minimum value of the first, second, and third values or a predefined rule.
  • Equation 4 It may be calculated based on or, And it may be determined without considering the number of resources (or the number of symbols) available for the second control information. remind may be assumed to be 0 or may be assumed to be an arbitrary value.
  • the first to fourth embodiments of the present disclosure have been divided for convenience of description, but since each embodiment includes operations related to each other, it is also possible that at least two or more embodiments are combined.
  • the present disclosure has described a method and implementation of receiving control and data information in initial transmission and retransmission in the case of HARQ-ACK feedback, the methods and apparatuses proposed in the present disclosure do not have HARQ-ACK feedback. The same method or an embodiment thereof may be applied to the system.
  • repeated transmission means additional transmission corresponding to the TB used for the initial transmission after the initial transmission.
  • the receiving unit, processing unit, and transmitting unit of the base station and the terminal may operate according to each embodiment.
  • 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
  • the terminal of the present disclosure may include a terminal receiving unit 25-00, a terminal transmitting unit 25-04, and a terminal processing unit 25-02.
  • the terminal receiving unit 25-00 and the terminal may collectively refer to the transmitting unit 25-04 as a transceiver in an embodiment 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, output it to the terminal processing unit 25-02, and transmit a signal output from the terminal processing unit 25-02 through a wireless channel.
  • the terminal processing unit 25-02 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure.
  • the terminal receiving unit 25-00 receives control information from the base station in downlink, and the terminal processing unit 25-02 determines the HARQ ID and the like according to the control information and prepares for transmission and reception accordingly. . Thereafter, the terminal transmitter 25-04 may transmit scheduled data to the base station.
  • 26 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.
  • the base station of the present disclosure may include a base station receiving unit 26-01, a base station transmitting unit 26-05, and a base station processing unit 26-03.
  • the base station receiver 26-01 and the base station transmitter 26-05 may be collectively referred to as a transceiver in an embodiment 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, output it to the base station processing unit 26-03, and transmit a signal output from the base station processing unit 26-03 through a wireless channel.
  • the base station processing unit 26-03 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure.
  • the base station processing unit 26-03 may transmit a downlink control signal to the terminal if necessary according to configuration information set by the base station processing unit 26-03. Thereafter, the base station transmitter 26-05 transmits related scheduling control information and data, and the base station receiver 26-01 receives feedback information from the terminal.
  • 27 is a block diagram of a terminal according to an embodiment of the present disclosure.
  • the terminal may include a transceiver 27-05, a memory 27-10, and a processor 27-15.
  • the transceiver 27-05, the processor 27-15, and the memory 27-10 of the terminal may operate.
  • the components of the terminal are not limited to the above-described example.
  • the terminal may include more or fewer components than the aforementioned components.
  • the transceiver 27-05, the processor 27-15, and the memory 27-10 may be implemented in the form of a single chip.
  • the processors 27-15 may include one or more processors.
  • the transceiver 27-05 collectively refers to a receiver of a terminal and a transmitter of the terminal, and may transmit/receive a signal to and from a network entity, a base station, or another terminal.
  • a signal transmitted and received with a network entity, a base station, or another terminal may include control information and data.
  • the transceiver 27-05 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal.
  • this is only an embodiment of the transceiver 27-05, and components of the transceiver 27-05 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 27-05 may receive a signal through a wireless channel, output it to the processor 27-15, and transmit a signal output from the processor 27-15 through a wireless channel.
  • the memory 27-10 may store programs and data necessary for the operation of the terminal. In addition, the memory 27-10 may store control information or data included in a signal obtained from the terminal.
  • the memory 27 - 10 may be configured as a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, the memory 27-10 may not exist separately and may be included in the processor 27-15.
  • the processor 27-15 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure.
  • the processor 27-15 may receive a control signal and a data signal through the transceiver 27-05, and process the received control signal and data signal.
  • the processed control signal and data signal may be transmitted through the transceiver 27-05.
  • the processor 27-15 may receive the DCI composed of two layers and control the components of the terminal to receive a plurality of PDSCHs at the same time.
  • 28 is a block diagram of a base station according to an embodiment of the present disclosure.
  • the base 7 may include a transceiver 28-06, a memory 28-10, and a processor 28-15.
  • the transceiver 28-06, the processor 28-15, and the memory 28-10 of the base station may operate.
  • the components of the base station are not limited to the above-described example.
  • the base station may include more or fewer components than the above-described components.
  • the transceiver 28-06, the processor 28-15, and the memory 28-10 may be implemented in the form of a single chip.
  • processors 28-15 may include one or more processors.
  • the transceiver 28-06 collectively refers to a receiver of a base station and a transmitter of the base station, and may transmit/receive a signal to and from a terminal or a network entity.
  • a signal transmitted and received with the terminal or network entity may include control information and data.
  • the transceiver 28-06 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal.
  • this is only an embodiment of the transceiver 28-06, and components of the transceiver 28-06 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 28-06 may receive a signal through a wireless channel, output it to the processor 28-15, and transmit a signal output from the processor 28-15 through a wireless channel.
  • the memory 28-10 may store programs and data necessary for the operation of the base station. In addition, the memory 28-10 may store control information or data included in a signal obtained from the base station.
  • the memory 28-10 may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, the memory 28-10 does not exist separately and may be included in the processor 28-15.
  • the processor 28-15 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure.
  • the processor 28-15 may receive a control signal and a data signal through the transceiver 28-06, and process the received control signal and data signal.
  • the processed control signal and data signal may be transmitted through the transceiver 28-06.
  • the processor 28-15 may control each component of the base station to configure and transmit the DCI including allocation information for the PDSCH.
  • the processor 28-15 may be plural, and the processor 28-15 may execute a program stored in the memory 28-10 to perform a component control operation of the base station.
  • a computer-readable storage medium storing one or more programs (software modules) may be provided.
  • One or more programs stored in a computer-readable storage medium may be configured to be executable by one or more processors in an electronic device (device configured for execution).
  • One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.
  • Such programs include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.
  • non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.
  • the program is transmitted through a communication network consisting of a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
  • a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed.
  • Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port.
  • a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

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

Abstract

La présente divulgation concerne : une technique de communication permettant de fusionner une technologie IdO avec un système de communication 5G pour prendre en charge un débit de transmission de données supérieur à celui d'un système 4G ; et un système associé. La présente divulgation peut être appliquée à des services intelligents (par exemple, maisons intelligentes, immeubles intelligents, villes intelligentes, voitures intelligentes ou voitures connectées, soins de santé, enseignement numérique, commerce de détail, services relatifs à la sécurité et la sûreté, et analogues) sur la base d'une technologie de communication 5G et d'une technologie relative à l'IdO. Un mode de réalisation de la présente divulgation concerne un procédé destiné à un terminal de transmission dans un système de communication. Le procédé comprend les étapes consistant à : transmettre des premières informations de commande de liaison latérale (SCI) à un terminal de réception; et transmettre des secondes SCI et des données de liaison latérale au terminal de réception sur la base des premières SCI, le nombre de symboles de modulation codés pour la transmission des secondes SCI étant basé sur les premières SCI.
PCT/KR2021/009658 2020-07-24 2021-07-26 Procédé et dispositif de transmission et de réception d'informations et de données de commande dans un système de communication à l'aide d'une liaison latérale WO2022019729A1 (fr)

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KR10-2020-0092503 2020-07-24
KR20200092503 2020-07-24
KR1020200099457A KR20220013280A (ko) 2020-07-24 2020-08-07 사이드링크를 이용한 통신 시스템에서 제어정보 및 데이터 송수신 방법 및 장치
KR10-2020-0099457 2020-08-07

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WO2024027604A1 (fr) * 2022-08-01 2024-02-08 中兴通讯股份有限公司 Procédés d'indication d'information d'occupation de canal, terminal de communication et support de stockage
WO2024063630A1 (fr) * 2022-09-25 2024-03-28 엘지전자 주식회사 Procédé et dispositif pour la réalisation d'une communication de liaison latérale dans une bande sans licence

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