KR20210004104A - Method and apparatus for code block group based retransmission in wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication method for fusing a 5G communication system for supporting a higher data transmitting rate than that of a 4G system with IoT techniques, and a system thereof. The present disclosure can be applied to intelligent services (e.g., a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication techniques and IoT-related techniques. According to the present disclosure, a method of a terminal of a wireless communication system comprises the steps of: receiving downlink control information (DCI) for scheduling transmission of at least one uplink data from a base station; confirming a bit configuring code block group transmission information (CBGTI) included in the DCI; confirming a code block group (CBG) requiring retransmission among the uplink data based on the confirmed CBGTI; and transmitting the uplink data corresponding to the CBG requiring retransmission to the base station.

Description

Code block group-based retransmission method and apparatus in wireless communication system {METHOD AND APPARATUS FOR CODE BLOCK GROUP BASED RETRANSMISSION IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for determining a code block group for receiving a downlink signal or a data channel or transmitting an uplink signal or a data channel in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, a 5G communication system or a pre-5G communication system is called a Beyond 4G Network communication system or an LTE system and a Post LTE system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Giga (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in the 5G system, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by techniques such as beamforming, MIMO, and array antenna. There is. As the big data processing technology described above, a cloud radio access network (cloud RAN) is applied as an example of the convergence of 5G technology and IoT technology.

In addition, in the 5G communication system, various technologies have been introduced to increase the efficiency of data communication, one of which is to support retransmission in units of code block groups.

Based on the above discussion, the present disclosure provides an apparatus and method for determining a code block group for receiving a downlink signal or a data channel or transmitting an uplink signal or a data channel in a wireless communication system.

In the present invention for solving the above problems of the present invention, in a method of a terminal in a wireless communication system, receiving downlink control information (DCI) for scheduling transmission of one or more uplink data from a base station Step to do; Checking bits constituting code block group transmission information (CBGTI) information included in the DCI; Identifying a code block group (CBG) requiring retransmission among the one or more uplink data based on the identified CBGTI information; And transmitting uplink data corresponding to the code block group requiring retransmission to the base station.

The bit constituting the CBGTI information is at least one of a bit of a CBGTI field of the DCI, an unused bit of a new data indicator (NDI) field, and an unused bit of a redundancy version (RV) field. It may include, and the number of bits constituting the CBGTI information may be set by higher layer signaling.

In addition, the step of confirming the number of uplink data to which CBGTI information is applied among uplink data in which retransmission is indicated based on the number of bits constituting the CBGTI information, wherein the number of uplink data to which the CBGTI information is applied The number is equal to the number of uplink data in which retransmission is indicated, or based on at least one of the maximum number of CBGs that can be set per transport block, the number of CBGs of uplink data, and the number of bits constituting the CBGTI information. Can be determined.

In addition, based on at least one of the number of bits applied to each of the uplink data to which the CBGTI information is applied among the CBGTI information, the maximum number of CBGs that can be set per transport block, and the number of CBGs of the uplink data, the It may further include the step of checking a CBG in which retransmission is indicated among uplink data to which CBGTI information is applied.

In addition, the step of receiving configuration information for setting retransmission in units of CBG from the base station, wherein the configuration information includes information for setting retransmission in units of CBG and the number of maximum code block groups that can be included in one TB, At least one of the size information of the CBGTI field of DCI may be included.

In addition, a method of a base station in a wireless communication system, the method comprising: receiving uplink data from a terminal; Generates downlink control information (DCI) including code block group transmission information (CBGTI) information indicating a code block group requiring retransmission among the uplink data Step to do; Transmitting the DCI to the terminal; And receiving the retransmitted uplink data based on the DCI from the terminal.

In addition, in the terminal of a wireless communication system, the transceiver; And receiving downlink control information (DCI) for scheduling transmission of one or more uplink data from the base station, and configuring code block group transmission information (CBGTI) information included in the DCI. A code block group (CBG) requiring retransmission among the one or more uplink data is identified based on the identified CBGTI information, and an uplink corresponding to the code block group requiring retransmission It characterized in that it comprises a control unit connected to the transmission and reception unit for controlling the transmission of data to the base station.

In addition, a base station of a wireless communication system, comprising: a transceiver; And downlink control including code block group transmission information (CBGTI) information indicating a code block group requiring retransmission among the uplink data, and receiving uplink data from the terminal. And a control unit connected to the transceiver for controlling to generate information (downlink control information, DCI), transmit the DCI to the terminal, and receive retransmitted uplink data from the terminal based on the DCI. To do.

An apparatus and method according to various embodiments of the present disclosure provides a method for a terminal to transmit an uplink signal or channel based on a code block group, thereby enabling a base station and a terminal to perform communication more effectively.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates an example of a radio resource area in a wireless communication system according to various embodiments of the present disclosure.
6 illustrates an example of a code block group configuration in a wireless communication system according to various embodiments of the present disclosure.
7 illustrates an example of scheduling and feedback in a wireless communication system according to various embodiments of the present disclosure.
8 illustrates a method of allocating frequency resources in a wireless communication system according to various embodiments of the present disclosure.
9 illustrates another method of allocating frequency resources in a wireless communication system according to various embodiments of the present disclosure.
10 is a diagram illustrating a time resource allocation method in a wireless communication system according to various embodiments of the present disclosure.
11 is a diagram illustrating a gap between two transmissions in a wireless communication system according to various embodiments of the present disclosure.
12 is a diagram illustrating an example of DCI scheduling one or more slots or PUSCHs.
13 is a diagram illustrating an example of a method of performing PUSCH transmission using CBGTI information.
14 is a diagram illustrating an example of a method of indicating additional MCS or HARQ process ID information through the DCI.
15 is a diagram illustrating an operation of a terminal implementing the present invention.
16 is a diagram showing an operation of a base station performing the present invention.

Hereinafter, embodiments of the present disclosure will be described in detail together with the accompanying drawings. In addition, in describing the present disclosure, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

Advantages and features of the present disclosure, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments make the disclosure of the disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to completely inform the scope of the disclosure to those who have, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments make the disclosure of the disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to completely inform the scope of the disclosure to those who have, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in the present embodiment refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and'~ unit' refers to certain roles. Perform. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. In addition, in an embodiment,'~ unit' may include one or more processors.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE- A broadband wireless communication system that provides high-speed, high-quality packet data services with communication standards such as Advanced (LTE-A), 3GPP2 High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e. Is developing. In addition, a communication standard of 5G or NR (new radio) is being developed as a fifth generation wireless communication system.

In the case of a 5G communication system, a technology capable of transmitting uplink signals without retransmission in units of code block groups (CBG) and uplink scheduling information to provide various services and support high data rates (e.g., authorization free uplink Various technologies will be introduced, such as grant-free uplink transmission, enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-level communications (URLLC) in wireless communication systems including 5G. Latency communications) may be provided to the UE. The above-described services may be provided to the same UE during the same time period. In an embodiment, eMBB transmits high-capacity data at high speed, and mMTC minimizes UE power Terminal access and URLLC may be services aiming at high reliability and low latency, but are not limited thereto.. The three services are in LTE system or 5G/NR (new radio, next radio) system after LTE. It may be a major scenario, but is not limited to the above examples In addition, the services of the 5G system described above are exemplary, and the possible services of the 5G system are not limited to the above examples, and the system providing the URLLC service is not limited to the above examples. The URLLC system and the system providing the eMBB service may be referred to as an eMBB system, and the terms service and system may be used interchangeably or interchangeably.

Hereinafter, the base station may include at least one of an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network as a subject performing resource allocation to the terminal. The terminal may include at least one of a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, an embodiment of the present disclosure will be described below using an LTE or LTE-A system as an example, and a physical channel in a conventional LTE or LTE-A system to describe the method and apparatus proposed in the present disclosure The terms and signal can be used. Embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type to the mobile communication system described in the present disclosure. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included therein. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person having skilled technical knowledge.

As a representative example of a broadband wireless communication system, a 5G system or a New Radio (NR) system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in downlink (DL), and OFDM and SC in uplink (UL). -Both single carrier frequency division multiple access (FDMA) or DFT-s-OFDM (DFT spread OFDM) schemes are employed. In the multiple access method, data or control information of each user can be distinguished by assigning and operating time-frequency resources to which data or control information of each user is transmitted so that they do not overlap with each other, that is, orthogonality is established. have.

The NR system employs a hybrid automatic repeat request (HARQ) scheme in which a physical layer retransmits corresponding data when a decoding failure occurs in initial transmission. The HARQ method is to enable the transmitter to retransmit the corresponding data in the physical layer by transmitting information (e.g., negative acknowledgment, NACK) informing the transmitter of a decoding failure when the receiver fails to accurately decode (decode) data. . The receiver may improve data reception performance by combining data retransmitted by the transmitter with data that has previously failed to be decoded. In addition, in the HARQ scheme, when the receiver correctly decodes data, the receiver transmits information (for example, acknowledgment, ACK) notifying the transmitter of decoding success so that the transmitter transmits new data.

In the following description, a term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, a term referring to a component of a device, etc. are for convenience of description. It is illustrated. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

In addition, the present disclosure describes various embodiments using terms used in some communication standards (for example, 3rd Generation Partnership Project, 3GPP), but this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

Various embodiments of the present disclosure are described based on the NR system, but the content of the present disclosure is not limited to the NR system, but may be applied to various wireless communication systems such as LTE, LTE-A, LTE-A-Pro, and 5G. Further, the contents of the present disclosure are described on the assumption that a system and apparatus for transmitting and receiving signals using an unlicensed band is assumed, but the contents of the present disclosure may also be applied to a system operating in a licensed band.

Hereinafter, in the present disclosure, higher layer signaling or higher signal is transmitted from the base station to the terminal using a downlink data channel of the physical layer, or from the terminal to the base station using an uplink data channel of the physical layer. It may be a method, at least one of radio resource control (RRC) signaling, packet data convergence protocol (PDCP) signaling, or a signal transmission method delivered through a MAC control element (media access control (MAC) control element, MAC CE) It may include. In addition, the higher layer signaling or higher signal may include system information commonly transmitted to a plurality of terminals, for example, a system information block (SIB), among information transmitted through a physical broadcast channel (PBCH), a master signal (MIB). information block) may also be included. In this case, the MIB may also be included in the upper signal.

1 illustrates a wireless communication system according to various embodiments of the present disclosure. 1 illustrates a base station 110, a terminal 120, and a terminal 130 as some of nodes using a radio channel in a wireless communication system. 1 shows only one base station, but another base station that is the same as or similar to 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 at which a signal can be transmitted. In addition to the base station, the base station 110 includes'access point (AP)','eNodeB (eNB)','gNodeB (gNB)', '5G node (5th generation node)', and'radio point ( 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 radio channel. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without user involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the terminal 120 and the terminal 130 is a terminal other than'user equipment (UE)','mobile station','subscriber station', and'remote terminal. )','wireless terminal', or'user device', or another term having an equivalent technical meaning.

The wireless communication environment 100 may include wireless communication in an unlicensed band. The base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in an unlicensed band (eg, 5 to 7 GHz, 64 to 71 GHz). In the unlicensed band, a cellular communication system and another communication system (for example, a wireless local area network, WLAN) may coexist. In order to ensure fairness between the two communication systems, that is, to prevent a situation in which a channel is exclusively used by one system, the base station 110, the terminal 120, and the terminal 130 are unlicensed bands. Channel access procedure for As an example of a channel access procedure for an unlicensed band, the base station 110, the terminal 120, and the terminal 130 may perform a listen before talk (LBT).

The base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in a millimeter wave (mmWave) band (for example, 28 GHz, 30 GHz, 38 GHz, 60 GHz). In this case, in order to improve the channel gain, the base station 110, the terminal 120, and the terminal 130 may perform beamforming. Here, beamforming may include transmission beamforming and reception beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may impart directivity to a transmitted signal or a received signal. To this end, the base station 110 and the terminals 120 and 130 may select serving beams through a beam search or beam management procedure. After the serving beams are selected, subsequent communication may be performed through a resource having a quasi co-located (QCL) relationship with a resource transmitting the serving beams.

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as the configuration of the base station 110 of FIG. 1. Terms such as'~ unit' and'~ group' used hereinafter refer to 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.

Referring to FIG. 2, the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 (which may be used interchangeably with the transmission/reception unit) performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a function of converting between a baseband signal and a 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 a transmission bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream through demodulation and decoding of the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. In addition, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, 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 operation power, operation frequency, etc. It can be composed of. The digital unit may be implemented with at least one processor (eg, a digital signal processor (DSP)).

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 is used in a sense including the processing as described above is performed by the wireless communication unit 210. According to an embodiment, the wireless communication unit 210 may include at least one transceiver.

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 a bit stream transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts a physical signal received from another 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 formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 230 provides stored data according to the request of the control unit 240. According to an embodiment, the storage unit 230 may include a memory.

The controller 240 controls overall operations of the base station. For example, the controller 240 transmits and receives signals 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 a communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210. According to an embodiment, the control unit 240 may include at least one processor.

According to various embodiments, the controller 240 may control the base station to perform operations according to various embodiments described below. For example, the control unit 240 may perform a channel access procedure for an unlicensed band. For example, a function that receives signals transmitted in an unlicensed band from a transmission/reception unit (for example, the wireless communication unit 210), and the control unit 240 defines the strength of the received signal in advance or takes a bandwidth as a factor. It is possible to determine whether the unlicensed band is in an idle state by comparing it with the determined threshold value. In addition, for example, the control unit 240 may transmit a control signal to the terminal through the transceiver or receive a control signal from the terminal. In addition, the control unit 240 may transmit data to the terminal through a transmission/reception unit or receive data from the terminal. The controller 240 may determine a transmission result for a signal transmitted to the terminal based on a control signal or a data signal received from the terminal.

In addition, for example, the control unit 240 maintains or changes the contention interval value for the channel access procedure based on the transmission result, that is, based on the reception result of the terminal for the control signal or the data signal (hereinafter, According to various embodiments, the control unit 240 may determine a reference slot in order to obtain a transmission result for the contention window adjustment. The data channel for the contention period adjustment may be determined in. The controller 240 may determine a reference control channel for the contention period adjustment in the reference slot If it is determined that the unlicensed band is in the idle state, the controller 240 ) Can occupy the channel.

In addition, the control unit 240 receives uplink data from the terminal through the wireless communication unit 210 according to the contents described in the present invention, and checks whether retransmission of one or more code block groups included in the uplink data is required. Can be controlled. In addition, the control unit 240 generates downlink control information for scheduling retransmission of a code block group requiring retransmission and/or initial transmission of uplink data, and transmits the downlink control information to the wireless communication unit 210 It can be controlled to transmit to the terminal through. At this time, information indicating whether to retransmit the code block group may be generated according to the contents described in the present invention. Further, the controller 240 may control the wireless communication unit 210 to receive (re)transmitted uplink data according to the downlink control information.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 may be understood as the configuration of the terminals 110 and 120 of FIG. 1. Terms such as'~ unit' and'~ group' used hereinafter refer to 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.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 (which may be used interchangeably with the transmission/reception unit) 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 the physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream through demodulation and decoding of the baseband signal. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, 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 be composed of a digital circuit and an analog circuit (eg, radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.

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'transmitting unit', a'receiving unit', or a'transmitting/receiving unit'. In addition, in the following description, transmission and reception performed through a wireless channel are used in a sense including the processing as described above is performed by the communication unit 310. According to an embodiment, the communication unit 310 may include at least one transceiver.

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 formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 320 provides stored data according to the request of the control unit 330. According to an embodiment, the storage unit 320 may include a memory.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. Also, the control unit 330 writes and reads data in the storage unit 320. In addition, the control unit 330 may perform functions of a protocol stack required by a communication standard. To this end, the controller 330 may include at least one processor or a micro processor, or may be a part of a processor. According to an embodiment, the control unit 330 may include at least one processor. In addition, according to an embodiment, a part of the communication unit 310 and/or the control unit 330 may be referred to as a communication processor (CP).

According to various embodiments, the controller 330 may control the terminal to perform operations according to various embodiments described below. For example, the control unit 330 may receive a downlink signal (downlink control signal or downlink data) transmitted by the base station through a transmission/reception unit (for example, the communication unit 310). Also, for example, the controller 330 may determine a transmission result for the downlink signal. The transmission result may include information on feedback on ACK, NACK, DTX, etc. of the transmitted downlink signal. In the present disclosure, the transmission result may be referred to in various terms such as a reception state of a downlink signal, a reception result, a decoding result, and HARQ-ACK information. In addition, for example, the control unit 330 may transmit an uplink signal as a response signal to a downlink signal to the base station through the transceiver. The uplink signal may explicitly or implicitly include a transmission result for the downlink signal.

The control unit 330 may perform a channel access procedure for an unlicensed band. For example, the transmission/reception unit (for example, the communication unit 310) receives signals transmitted in an unlicensed band, and the control unit 330 defines the strength of the received signal in advance, or a function using a bandwidth as a factor. The value may be compared with the determined threshold value to determine whether the unlicensed band is in an idle state. The control unit 330 may perform an access procedure for an unlicensed band in order to transmit a signal to the base station.

4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. 4 shows an example of 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 part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3, and illustrates components for performing beamforming.

Referring to FIG. 4, the wireless communication unit 210 or the communication unit 310 includes an encoding and modulating unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beam. It includes a forming part 408.

The encoding and modulating unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulating unit 402 generates modulation symbols by performing contellation mapping.

The digital beamforming unit 404 performs beamforming on a digital signal (eg, modulation symbols). To this end, the digital beamforming unit 404 multiplies the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the size and phase of a signal, and may be referred to as a'precoding matrix', a'precoder', and the like. The digital beamforming unit 404 outputs digitally beamformed modulation symbols through a plurality of transmission paths 406-1 to 406-N. In this case, according to a multiple input multiple output (MIMO) transmission scheme, modulation symbols may be multiplexed or the same modulation symbols may be provided through 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. To this end, each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a digital-to-analog converter (DAC), and an up-conversion unit. . The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) method, and may be excluded when another physical layer method (for example, filter bank multi-carrier, FBMC) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide an independent signal processing process 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.

The analog beamforming unit 408 performs beamforming on an analog signal. To this end, the analog beamforming unit 408 multiplies the analog signals by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of the signal. Specifically, the analog beamforming unit 408 may be variously configured according to a connection structure between the plurality of transmission paths 406-1 to 406-N and antennas. For example, each of the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, a plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, the plurality of transmission paths 406-1 to 406-N may be adaptively connected to one antenna array, or may be connected to two or more antenna arrays.

In the 5G system, in consideration of various services and requirements, the frame structure needs to be defined flexibly. For example, each service may have a different subcarrier spacing (SCS) according to requirements. The current 5G communication system supports a plurality of subcarrier intervals, and the subcarrier interval may be determined from Equation 1.

[Equation 1]

는 서브캐리어 간격을 나타낸다. 예를 들어, f₀가 15kHz라고 하면, 5G 통신 시스템이 가질 수 있는 서브캐리어 간격의 세트(set)는 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz 중 하나로 구성될 수 있다. 사용 가능한 서브캐리어 간격 세트(set)는 주파수 대역에 따라 상이할 수 있다. 예컨대, 7GHz 이하의 주파수 대역에서는 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz 중 적어도 하나 이상의 서브캐리어 간격이 사용될 수 있고, 7GHz 이상의 주파수 대역에서는 60kHz, 120kHz, 240kHz 또는 그 이상의 서브캐리어 간격 중 적어도 하나 이상의 서브캐리어 간격이 사용될 수 있다.In Equation 1, f ₀ represents the basic subcarrier spacing of the system, m represents an integer scaling factor,

Represents the subcarrier spacing. For example, if f ₀ is 15 kHz, a set of subcarrier intervals that a 5G communication system can have may be composed of one of 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, and 480 kHz. . The usable subcarrier spacing set may differ depending on the frequency band. For example, in a frequency band of 7 GHz or less, at least one subcarrier spacing of 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, and 60 kHz may be used, and in a frequency band of 7 GHz or higher, at least one of subcarrier spacing of 60 kHz, 120 kHz, 240 kHz or more More than one subcarrier spacing can be used.

In various embodiments, the length of a corresponding OFDM symbol may vary according to a subcarrier interval constituting the OFDM symbol. This is because the subcarrier interval and the length of the OFDM symbol have an inverse relationship with each other as a characteristic of the OFDM symbol. For example, when the subcarrier interval is doubled, the symbol length is shortened to 1/2, and conversely, when the subcarrier interval is reduced to 1/2, the symbol length is doubled.

5 illustrates an example of a radio resource area in a wireless communication system according to various embodiments of the present disclosure. In various embodiments, the radio resource region may include a structure of a time-frequency domain. In various embodiments, the wireless communication system may comprise an NR communication system.

Referring to FIG. 5, in the radio resource domain, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain may be OFDM (orthogoanl frequency division multiplexing) and/or DFT-s-OFDM (discrete fourier transform (DFT)-spread-OFDM) symbol, and N _symb OFDM and/or DFT-s -OFDM symbols 501 may be gathered to form one slot 502. In various embodiments, the OFDM symbol may include a symbol for a case of transmitting and receiving a signal using an OFDM multiplexing scheme, and the DFT-s-OFDM symbol is DFT-s-OFDM or single carrier frequency division (SC-FDMA). Multiple access) A symbol for a case of transmitting and receiving a signal using a multiplexing scheme may be included. Hereinafter, in the present disclosure, an embodiment of an OFDM symbol is described for convenience of description, but this embodiment can also be applied to an embodiment of a DFT-s-OFDM symbol. In addition, in the present disclosure, an embodiment of transmitting and receiving a downlink signal is described for convenience of description, but this is applicable to an embodiment of transmitting and receiving an uplink signal.

If the subcarrier interval is 15 kHz, unlike FIG. 5, one slot 502 constitutes one subframe 503, and the lengths of the slot 502 and the subframe 503 are each 1 ms. Can be In various embodiments, the number of slots and the length of the slots constituting one subframe 503 may differ according to the subcarrier interval. For example, when the subcarrier interval is 30 kHz, two slots may constitute one subframe 503. At this time, the length of the slot is 0.5 ms and the length of the subframe 503 is 1 ms. In addition, the radio frame 504 may be a time domain section composed of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and a carrier bandwidth constituting a resource grid may be composed of a total of N _sc ^BW subcarriers 505.

)은 15kHz, 30kHz, 60kHz, 120kHz, 240kHz 중 하나일 수 있고, 서브캐리어 간격(

)에 따라 하나의 서브프레임에 포함되는 슬롯의 개수는, 1, 2, 4, 8, 16 일 수 있다. However, the subcarrier interval, the number of slots 502 included in the subframe 503, and the length of the slot 502 may be variably applied. For example, in the case of the LTE system, the subcarrier interval is 15 kHz, and two slots constitute one subframe 503, in which case the length of the slot 502 is 0.5 ms and the length of the subframe 503 may be 1 ms. have. For another example, for an NR system, the subcarrier spacing (

) Can be one of 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, and the subcarrier interval (

), the number of slots included in one subframe may be 1, 2, 4, 8, or 16.

In the time-frequency domain, a basic unit of a resource may be a resource element (RE) 506, and the resource element 506 may be expressed by an OFDM symbol index and a subcarrier index. The resource block may include a plurality of resource elements. In the LTE system, a resource block (Resource Block, RB, or physical resource block (PRB), 507) is N _symb consecutive OFDM symbols 501 in the time domain and N _SC ^RB consecutive in the frequency domain It may be defined as subcarriers 508. The number of symbols included in one RB may be N _symb = 14, the number of subcarriers may be N _SC ^RB = 12, the number of symbols included in one RB may be N _symb = 7, subcarriers The number may be N _SC ^RB = 12, and the number of RBs (number of RBs, N _RB ) may vary according to the bandwidth of the system transmission band.

In the NR system, the resource block 507 may be defined as N _SC ^RB consecutive subcarriers in the frequency domain. The number of subcarriers may be N _SC ^RB =12. The frequency domain may include common resource blocks (CRBs), and a physical resource block (PRB) may be defined in a bandwidth part (BWP) in the frequency domain. The CRB and PRB numbers may be determined differently according to the subcarrier interval.

In case of downlink control information, it may be transmitted in the first N OFDM symbol(s) in a slot. In general, it may be N = {1, 2, 3}, and the terminal may be configured with the number of symbols through which downlink control information can be transmitted from the base station through higher laying signaling. In addition, according to the amount of control information to be transmitted in the current slot, the base station changes the number of symbols in which downlink control information can be transmitted in the slot for each slot, and changes the information on the number of symbols to a separate downlink control channel. It can also be delivered to the terminal through.

In the NR and/or LTE system, scheduling information for downlink data or uplink data may be transmitted from the base station to the terminal through downlink control information (DCI). In various embodiments, DCI may be defined according to various formats, and each format includes whether the DCI includes scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data. It may vary depending on whether a compact DCI having a small size of control information, a fall-back DCI, spatial multiplexing using multiple antennas is applied, and/or a DCI for power control.

For example, the DCI format (eg, DCI format 1_0 of NR), which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information. -Control information format identifier (DCI format identifier): a separator that identifies the format of DCI

-Frequency domain resource assignment: indicates the RB allocated for data transmission.

-Time domain resource assignment: indicates slots and symbols allocated for data transmission.

-VRB-to-PRB mapping: indicates whether to apply the VRB (virtual resource block) mapping method

-Modulation and coding scheme (MCS): Indicate the modulation method used for data transmission and the size of the transport block, which is the data to be transmitted.

-New data indicator (NDI): indicates whether HARQ initial transmission or retransmission.

-Redundancy version (RV): indicates a redundancy version of HARQ.

-HARQ process number: indicates the process number of HARQ.

-PDSCH assignment index (downlink assignment index): indicates the number of PDSCH reception results (eg, HARQ-ACK number) to be reported to the base station to the terminal

-A transmit power control command for PUCCH (transmit power control (TPC) command) for a physical uplink control channel (PUCCH): indicates a transmit power control command for the uplink control channel PUCCH.

-PUCCH resource indicator (PUCCH resource indicator): a PUCCH resource indication used for HARQ-ACK reporting including a reception result for the PDSCH configured through the DCI

-PUCCH transmission timing indicator (PDSCH-to-HARQ_feedback timing indicator): indicates slot or symbol information in which PUCCH should be transmitted for HARQ-ACK reporting including a reception result for the PDSCH configured through the corresponding DCI

DCI may be transmitted on a downlink physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH) through a channel coding and modulation process. Hereinafter, transmission and reception of the PDCCH or EPDCCH may be understood as DCI transmission and reception on the PDCCH or EPDCCH, and transmission and reception of a physical downlink shared channel (PDSCH) may be understood as transmission and reception of downlink data on the PDSCH.

In various embodiments, a specific radio network temporary identifier (RNTI) that is independent for each terminal, or a cyclic redundancy check (CRC) scrambled with the terminal identifier C-RNTI (Cell-RNTI)) is added to the DCI, After the DCI for each terminal is channel-coded, it may be configured as an independent PDCCH and transmitted. In the time domain, the PDCCH may be transmitted during a control channel transmission period. The mapping position of the PDCCH in the frequency domain may be determined by at least an identifier (ID) of each terminal, and may be transmitted in a set frequency band among the entire system transmission band or the system transmission band. Alternatively, the mapping position of the PDCCH in the frequency domain may be set by higher layer signaling.

Downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for transmitting downlink data. The PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a mapping position of the PDSCH and a modulation method for the PDSCH in the frequency domain may be determined based on DCI transmitted through the PDCCH.

Through the modulation and coding method (MCS) information among the control information constituting the DCI, the base station may notify the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size, TBS). In various embodiments, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to the size of the TB before the channel coding for error correction is applied to the data (transport block, TB) intended to be transmitted by the base station.

Modulation schemes supported for uplink and downlink data transmission in the NR system may include at least one of quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, and 256QAM, and each modulation order (Modulation order, Q _m ) may be 2, 4, 6, and 8, respectively. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, 6 bits per symbol for 64QAM modulation, and 8 bits per symbol for 256QAM modulation may be transmitted. In addition, a modulation scheme of 256QAM or more may be used according to system modifications.

Data transmitted in downlink or uplink, that is, a transport block (TB), or a codeword (CW) may be divided into one or more code blocks (CB). 6 is a diagram illustrating a code block and a code block group. According to FIG. 6, a cyclic redundancy check (CRC) 603 is added to the last or first part of the TB 601 to data or TB 601 to be transmitted in downlink or uplink, and a terminal receiving data or The base station may determine whether the TB has been correctly received through the CRC. The CRC may have 16 bits or 24 bits, a predetermined number of bits, or a variable number of bits according to channel conditions, and may be used to determine whether channel coding is successful. In this case, the block to which TB and CRC are added may be divided into several CBs 607, 609, 611, 613 (605).

In this case, the TB may be divided by a maximum size of a code block defined in advance or a maximum size of a CB set through an upper signal from the base station. Accordingly, at least one of the first code block 607 or the last code block 613 may be smaller in size than other code blocks, and in this case, the first code block 607 or the last code block 613 You can put 0, a random value, or 1 to make the length equal to other code blocks. CRCs 617, 619, 621, and 623 may be added to each of the code blocks divided into one or more (615). The CRC may have 16 bits, 24 bits, or a predetermined number of bits, and may be used to determine whether channel coding is successful.

The CRC 603 added to the TB and the CRCs 617, 619, 621, and 623 added to the code block may be omitted depending on the type of channel code to be applied to the code block. For example, when an LDPC code rather than a turbo code is applied to a code block, all or part of the CRCs 617, 619, 621, and 623 to be inserted for each code block may be omitted. In this case, the meaning that some of the CRC is omitted is the same as that the CRC length is reduced. However, even when the LDPC code is applied to the code block, the CRCs 617, 619, 621, and 623 may be added to the code block as it is. Also, even when a polar code is used, a CRC may be added or omitted.

In addition, one or more code blocks may be composed of a code block group (CBG). In this case, the base station may set the terminal to group one TB into a maximum of M code block groups through an upper signal. Referring to FIG. 6 as an example, if the terminal receives the maximum number of code block groups for one TB as M through the higher signal from the base station, the terminal returns the TB divided into the N code blocks as M It can be grouped into two code block groups 630 and 635. In this case, the number of code blocks included in one code block group may vary according to the size of TB. In other words, since the number of code blocks is different according to the size of the TB, the number of code blocks included in the code block group may also be different. For example, in the above case, if the TB is divided into M code blocks, one code block group may be composed of one code block. If the TB is divided into 2M code blocks, one code block group may consist of two code blocks. That is, the number of code blocks included in one code block group may vary according to the size of the TB or the number of code blocks constituting the TB.

At this time, to determine that the codeword or TB transmitted and received through the downlink data channel is divided into one or more code block groups (for example, M code block groups, M is a positive integer equal to or greater than 1) and transmitted. The configured terminal may transmit, to the base station, a downlink reception result for each of the set or divided code block groups (M CBGs) to the base station through an uplink control channel or an uplink data channel. In this case, code block group transmission information (CBGTI) indicating which code block group is transmitted to the DCI scheduling the downlink data channel may be included, and the code block group transmission information field includes the It may be composed of a bit string consisting of the maximum number of code block groups (M) for each TB set.

Through this field, the terminal may determine a code block group actually transmitted by the base station through the downlink data channel. For example, in the case of M=4, when the terminal receives a DCI for scheduling retransmission of downlink data, and the value of the CBGTI field of the DCI is, for example, 0011, the terminal is a code block constituting the TB. It may be determined that the third and fourth code block groups (data corresponding to) among the groups are transmitted through the downlink data channel. In the case of DCI scheduling initial transmission of downlink data, the terminal may receive downlink data corresponding to all code block groups through a downlink data channel.

If the codeword or TB transmitted and received through the uplink data channel is set to be divided into one or more code block groups (for example, M code block groups, M is a positive integer equal to or greater than 1), it is determined to be transmitted. The terminal may determine the uplink reception result of the base station for each of the divided code block groups (M CBGs) in the following manner. The base station transmits to the terminal through downlink control information (UL grant) transmitted to configure or schedule uplink data transmission (for example, when NDI included in DCI is toggled (NDI toggling)), the DCI is new data May be interpreted as scheduling, and if NDI is not toggled, the DCI may be interpreted as scheduling data retransmission), the separated code block group (M CBGs) through separate control information or channels The uplink reception result of the base station for can be transmitted to the terminal. At this time, as in the case of the downlink data channel, the base station transmits code block group transmission information (CBGTI) indicating which code block group the terminal should transmit to the terminal through DCI scheduling transmission of the uplink data channel. I can.

Like downlink, the CBGTI may be composed of a bit string consisting of the set maximum number of code block groups for each TB (M), and through the field, the terminal requests the base station to actually transmit the code through the uplink data channel. Block groups can be determined. In the case of M=4, for example, when the terminal receives a DCI for scheduling retransmission of uplink data, and the value of the CBGTI field of the DCI is, for example, 0011, the terminal is a code block constituting the TB. The third and fourth code block groups (data corresponding to) among the groups may be transmitted through an uplink data channel. In the case of DCI scheduling the initial transmission of uplink data, the terminal may transmit uplink data corresponding to all code block groups through an uplink data channel.

7 is a diagram illustrating an example of scheduling and feedback in a wireless communication system according to various embodiments of the present disclosure. The base station may transmit control information including scheduling information for a downlink and/or uplink data channel to the terminal. The base station may transmit downlink data to the terminal according to the scheduling information. The terminal receiving the data may transmit HARQ-ACK information, which is feedback for downlink data, to the base station. Alternatively, the terminal may transmit uplink data to the base station according to the scheduling information. The base station receiving the data may transmit HARQ-ACK information, which is feedback on the uplink data, to the terminal, and the feedback at this time is an NDI of scheduling information for an uplink data channel or a new data indicator. The terminal can determine through the value.

In the NR system, the uplink and downlink HARQ schemes may include an asynchronous HARQ scheme in which data retransmission time is not fixed. For example, in the case of downlink, when NACK is fed back as a result of the UE's reception of downlink data transmitted from the base station, the base station can freely determine the retransmission time of the downlink data according to the base station scheduling operation. If the UE that has received downlink data retransmission scheduled from the base station buffers the data determined as an error as a result of decoding the received data for HARQ operation with the previously received downlink data, the data retransmitted from the base station and combined (Combining) can be performed. The base station may be the base station 110 of FIG. 1, and the terminal may be the terminals 120 and 130 of FIG. 1.

Referring to FIG. 7, a resource region through which a data channel is transmitted in a 5G or NR communication system is illustrated. The UE may monitor and/or search for the PDCCH 710 in a downlink control channel (hereinafter referred to as PDCCH) region (hereinafter referred to as CORESET (control resource set) or search space (SS)) set through an upper signal from the base station. . At this time, the downlink control channel region is composed of a time domain 714 and a frequency domain 712, the time domain 714 may be set in units of symbols, and the frequency domain 712 may be set in units of RBs or groups of RBs. .

If the UE detects the PDCCH 710 in the slot i 700, the UE may acquire downlink control information (DCI) transmitted through the detected PDCCH 710. Through the received DCI, the terminal may acquire scheduling information for a downlink data channel or an uplink data channel 740. In other words, the DCI is at least the time-frequency resource region (or PDSCH transmission region) information in which the UE should receive a downlink data channel (hereinafter referred to as PDSCH) transmitted from the base station, or the UE transmits an uplink data channel (PUSCH). It may include time-frequency resource domain information allocated from the base station.

A case in which the UE is scheduled to transmit PUSCH will be described as follows. The terminal receiving the DCI may obtain a slot index or offset information (K) for receiving a PUSCH transmitted through the DCI, and determine the PUSCH transmission slot index. For example, the UE may determine that the PUSCH is scheduled to be transmitted in the slot i+K 705 through the received offset information (K) based on the slot index i 700 that received the PDCCH 710. . In this case, the UE may determine a PUSCH start symbol or time in slot i+K 705 or slot i+K based on the received offset information K, based on the CORESET receiving the PDCCH 710.

In addition, the UE may obtain information on the PUSCH transmission time-frequency resource region 740 in the PUSCH transmission slot 705 in the DCI. The information for setting the PUSCH transmission frequency resource region 730 may include physical resource block (PRB) or group unit information of PRB. Meanwhile, the information for setting the PUSCH transmission frequency resource region 730 relates to a region included in the initial bandwidth or the initial BWP determined or set by the terminal through the initial access procedure. It could be information. If the UE has configured an uplink bandwidth or an uplink bandwidth portion through an upper signal, the information for setting the PUSCH transmission frequency resource region 730 is an uplink bandwidth (BW) or an uplink bandwidth portion set through an upper signal. It may be information on an area included in the (BWP).

In various embodiments, the information for setting the PUSCH transmission time resource region 725 may be information in units of symbols or groups of symbols, or information indicating absolute time information. The information for configuring the PUSCH transmission time resource region 725 may be expressed as a PUSCH transmission start time or symbol and a length of a PUSCH, or a PUSCH end time or a combination of symbols, and may be included in DCI as one field or value. The UE may transmit a PUSCH in the PUSCH transmission resource region 740 determined through DCI. The above can also be applied to a downlink data channel (PDSCH) for transmitting downlink data.

In various embodiments, the terminal receiving the PDSCH 740 may report a reception result (for example, HARQ-ACK/NACK) for the PDSCH 740 to the base station. At this time, the uplink control channel (PUCCH, 770) transmission resource for transmitting the reception result for the PDSCH 740 (that is, uplink control information) is the PDSCH indicated through the DCI 710 scheduling the PDSCH 740- It may be determined by the terminal based on the to-HARQ timing indicator (PDSCH-to-HARQ timing indicator) and the PUCCH resource indicator (PUCCH resource indicator). In other words, the terminal receiving the PDSCH-to-HARQ timing indicator K1 through the DCI 710, the PUCCH 770 in the slot i+K+K1 750 after K1 from the PDSCH 740 reception slot 705 Can be transmitted.

The base station may set one or more K1 values to the UE through higher layer signaling, or may indicate a specific K1 value to the UE through DCI as described above. K1 may be determined according to the HARQ-ACK processing capability of the UE, that is, the minimum time required for the UE to receive the PDSCH and generate and report the HARQ-ACK for the PDSCH. In addition, the terminal may use a predefined value or a default value as the K1 value until the K1 value is set. At this time, the time at which the UE transmits the reception result (HARQ-ACK) for the PDSCH may not be indicated through one of K1 values defined in advance or set through a higher signal or a non-numerical value. .

In this case, the transmission of the PUCCH 770 in the PUCCH transmission slot 750 may be performed on a resource indicated through the PDCCH resource indicator of DCI 710. At this time, when a plurality of PUCCH transmissions are configured or indicated in the PUCCH transmission slot 750, the UE may perform PUCCH transmission in PUCCH resources other than the resources indicated through the PUCCH resource indicator of the DCI 710.

In a 5G communication system, in order to dynamically change a downlink signal transmission and an uplink signal transmission period in a time division duplex (TDD) system, whether each of the OFDM symbols constituting one slot is a downlink symbol or an uplink symbol Alternatively, whether a symbol is flexible may be indicated by a slot format indicator (SFI). Here, a symbol indicated as a flexible symbol refers to a symbol that is not both a downlink and an uplink symbol, or can be changed to a downlink or uplink symbol by UE-specific control information or scheduling information. In this case, the flexible symbol may include a gap guard required in the process of switching from downlink to uplink.

The slot format indicator may be simultaneously transmitted to a plurality of terminals through a terminal group (or cell) group common control channel. In other words, the slot format indicator may be transmitted through the CRC scrambled PDCCH with an identifier different from the UE-specific identifier (C-RNTI) (eg, SFI-RNTI). In various embodiments, the slot format indicator may include information on N slots, and the value of N is an integer or natural value greater than 0, or 1, 2, 5, 10, 20, etc. Among the set of possible values, the base station may be a value set through an upper signal to the terminal. In addition, the size of the slot format indicator information can be set by the base station to the terminal through an upper signal. Examples of slot formats that can be indicated by the slot format indicator are shown in Table 1 below.

[Table 1]

In Table 1, D represents a downlink, U represents an uplink, and F represents a flexible symbol or a flexible symbol. According to Table 1, the total number of supported slot formats is 256. In the current NR system, the maximum size of the slot format indicator information bit is 128 bits, and the slot format indicator information bit is a value that can be set by the base station to the terminal through an upper signal (eg, dci-PayloadSize). In this case, the cell operating in the licensed band or the unlicensed band may set and indicate an additional slot format as shown in Table 2 below using one or more additionally introduced slot formats or modified formats of at least one of the existing slot formats. Table 2 shows an example of a slot format in which one slot is composed of an uplink (U) and a flexible symbol or a flexible symbol (F).

[Table 2]

In various embodiments, the slot format indicator information may include a slot format for a plurality of serving cells, and a slot format for each serving cell may be identified through a serving cell ID (ID). In addition, a slot format combination for one or more slots may be included for each serving cell. For example, if the size of the slot format indicator information bit is 3 bits and the slot format indicator information is composed of a slot format indicator for one serving cell, the 3 bits slot format indicator information is a total of 8 slot format indicators or slots. It may be one of a combination of format indicators (hereinafter, a slot format indicator), and the base station may indicate one slot format indicator among 8 slot format indicators through terminal group common control information (group common DCI).

In various embodiments, at least one slot format indicator among the eight slot format indicators may be configured as a slot format indicator for a plurality of slots. For example, Table 3 below shows an example of 3-bit slot format indicator information configured in the slot formats of Tables 1 to 2. Of the slot format indicator information, 5 (slot format combination ID 0, 1, 2, 3, 4) are slot format indicators for one slot, and the remaining 3 are slot format combination IDs for 4 slots. It is information about 5, 6, 7) and can be sequentially applied to 4 slots. In this case, the slot format indicator information may be sequentially applied from the slot in which the slot format indicator is received.

Slot format combination ID Slot Formats 0 0 One One 2 2 3 19 4 9 5 0 0 0 0 6 1 1 1 1 7 2 2 2 2

The terminal may receive configuration information on the PDCCH for which the slot format indicator information is to be detected through an upper signal, and may detect the slot format indicator according to the configuration. For example, the UE is among the RNTI information used for CRC scrambling of the DCI in which the slot format indicator information is to be detected, the CORESET setting, the search space setting, the slot format indicator information is transmitted, and the period and offset information of the search space. At least one can be set through an upper signal.

Hereinafter, a method of allocating uplink resources will be described. Uplink resources for transmitting signals or data may be continuously or discontinuously allocated, and when a specific resource allocation type is determined, information indicating uplink resource allocation is interpreted according to the specific resource allocation type. Meanwhile, in the 3GPP standard, signals and channels are used separately, but in the present disclosure hereinafter, an uplink transmission signal or an uplink transmission channel is used without distinction, or the uplink transmission signal is It may be used to mean including all of an uplink transmission signal or an uplink transmission channel, or to represent the same. This is because the uplink resource allocation method or the method of determining the uplink transmission start position proposed in the present disclosure can be commonly applied to both the uplink transmission signal and the uplink transmission channel. In this case, the uplink resource allocation method or the method of determining the uplink transmission start position proposed in the present disclosure may be independently applied to each of the uplink transmission signal or the uplink transmission channel without separate division or description.

- Uplink resource allocation type 0

The uplink resource allocation type 0 method is a method of allocating resources in units of Resource Block Groups (RBGs) composed of consecutive P resource blocks (RBs). At this time, the size P of the RBG is set to one of Configuration 1 to Configuration 2 through an upper signal, for example, the rbg-size value of pusch-Config, and is a table based on the information and the size of the active uplink bandwidth part. P can be determined as shown in 4. Table 4 is a table showing the size of the bandwidth part and the size of P according to the RBG setting value. In this case, the size of the bandwidth portion is the number of PRBs constituting the bandwidth portion.

Carrier Bandwidth Part Size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

The number of total RBGs constituting the uplink bandwidth portion (N _BWP ) may be determined as N _RBG = ceiling (N _BWP ^size + N _BWP ^start mod P)/P). Here, the size of the first RBG (RBG ₀ ) is P-N _BWP ^start mod P. If the ^{size of} (N _BWP ^start + N _BWP ^size ) mod P is greater than 0, the size of the last RBG (RBG _last ) is (N _BWP ^start + N _BWP ^size ) mod P, and if (N _BWP ^start + N _BWP ^size ) If the ^size of mod P is not greater than 0, the size of the last RBG (RBG _last ) is P. The size of the remaining RBGs excluding the first and last RBGs is P. In this case, N _BWP ^start refers to a CRB at which the BWP starts relatively at CRB0, and may be understood as a point at which a specific BWP starts at CRB. N _BWP ^size refers to the number of RBs included in the BWP.

At this time, the length (or size or number of bits) of the frequency resource allocation information is equal to N _RBG, and the UE uses a bitmap composed of N _RBG bits to set uplink transmission configured or scheduled for each RBG in RBG units. Can be set or scheduled. For example, the UE may determine that the RBG region set to 1 in the bitmap is a resource allocated for uplink transmission, and the RBG region set to 0 may determine that it is not a resource allocated for uplink transmission. . At this time, the RBG bitmaps are arranged and mapped sequentially (ascending order) along the axis of increasing frequency. Through this method, continuous or non-contiguous RBG may be allocated for uplink transmission.

- Uplink resource allocation type 1

The uplink resource allocation type 1 scheme is a scheme of allocating continuous frequency resources within an activated uplink bandwidth portion. The frequency resource allocation information of the uplink resource allocation type 1 scheme may be indicated to the terminal through a resource indication value (RIV). The length (or size or number of bits) of the frequency resource allocation information is equal to ceiling(log ₂ (N _BWP (N _BWP +1)/2)) RIV is the start of frequency resource allocation RB (RB _start ) as follows: And L consecutively allocated RBs (L _RBs ).

가 사용될 수 있다. Here, N _BWP is the size of the active uplink bandwidth part, expressed as the number of PRBs, RB _start is the first PRB at which uplink resource allocation starts, and L _RBs is the length or number of consecutive PRBs. At this time, if one of the DCIs (uplink grants) for configuring or scheduling uplink transmission, for example, DCI format 0_0 is transmitted in a common search space (CSS), the initial N _BWP Uplink bandwidth part size

Can be used.

)에 기반해 결정되나 상기 상향링크 그랜트가 또 다른 활성화된 대역폭부분(활성화된 대역폭부분의 크기

)을 스케줄링하는 DCI인 경우, RIV 값은 RB_start=0, K, 2K, ... , (

-1)·K 및 L_RBs=K, 2K, ... ,

·K이며 다음과 같이 구성된다. In addition, in the case of a DCI format of one of the uplink grants, for example, the DCI format 0_0 transmitted in a UE specific common search space (USS), the size or number of bits of the frequency resource allocation information of the uplink grant is initially The size of the bandwidth part (

), but the uplink grant is another active bandwidth part (the size of the active bandwidth part

) For DCI scheduling, the RIV value is RB _start = 0, K, 2K, ..., (

-1) K and L _RBs =K, 2K, ...,

It is K and it is composed as follows.

의 경우 K는

을 만족하는 자연수일 수 있으며, 특히 {1, 2, 4, 8}의 값 중 하나일 수 있다. 이 외의 경우 K=1이다.At this time

If K is

It may be a natural number that satisfies, and in particular, may be one of values of {1, 2, 4, 8}. Otherwise, K=1.

- Uplink resource allocation type 2

The uplink resource allocation type 2 scheme is a scheme in which frequency resources for transmitting an uplink signal or channel are allocated to be distributed over the entire portion of the activated uplink bandwidth, and the distance or interval between allocated frequency resources is the same or equal. . In the uplink resource allocation type 2 above, since resources are evenly distributed across all frequency bands, resources are allocated in an unlicensed band that needs to satisfy requirements for frequency allocation such as power spectral density (PSD) requirements and occupancy channel bandwidth (OCB) conditions. It may be limited and applied when transmitting an uplink signal and a channel transmitted from an operating carrier or cell or a bandwidth portion.

또는

개의 PRB로 구성될 수 있다. 도 8의 경우, 첫 번째 자원 영역 집합(830)은 11개의 PRB(#i, #i+5, #i+10, #i+15, ... , #i+45, #i+50)로 구성되어 있고, 나머지 자원 영역 집합, 예를 들어 네 번째 자원 영역 집합(840)은 10개의 PRB(#i+3, #i+8, #i+13, #i+18, ... , #i+48)로 구성되어 있다. 다시 말해, 대역폭부분의 크기 또는 대역폭부분의 PRB수에 따라서 자원 영역 집합에 포함되는 PRB의 수는 다를 수 있다. 단말은 상기와 같이 구성된 하나 이상의 자원 영역 집합을 할당받을 수 있으며, 상향링크 자원 할당 타입 1 방식과 유사한 방법(예를 들어, RIV 값을 기반으로 할당)을 통해 연속적인 자원 영역 집합을 할당(예를 들어, 자원 영역 집합 #0, #1 또는 #2, #3, #4)받거나, 상향링크 자원 할당 타입 0 방식과 유사하게(예를 들어, 비트맵을 기반으로 할당) 연속적이거나 비연속적인 자원 영역 집합을 할당받을 수도 있다. Referring to FIG. 8 as an example, an uplink resource allocation type 2 scheme will be described as follows. FIG. 8 is a diagram illustrating a case in which a UE is configured to transmit and receive uplink signals with a base station through a bandwidth part 820 and is scheduled to transmit an uplink data channel through an uplink resource allocation type 2 scheme. 820) is assumed to be composed of 51 PRBs, and this is only an example. According to the uplink resource allocation type 2 scheme, the 51 PRBs are composed of L (L=5) resource region sets 810, and each resource region set is

or

It can be composed of four PRBs. In the case of FIG. 8, the first resource region set 830 is 11 PRBs (#i, #i+5, #i+10, #i+15, ..., #i+45, #i+50) Consists of, and the remaining resource zone set, for example, the fourth resource zone set 840 is 10 PRBs (#i+3, #i+8, #i+13, #i+18, ..., #i+48). In other words, the number of PRBs included in the resource region set may vary according to the size of the bandwidth portion or the number of PRBs of the bandwidth portion. The UE may be allocated one or more resource region sets configured as described above, and allocates a continuous set of resource regions through a method similar to the uplink resource allocation type 1 scheme (e.g., allocation based on RIV value) (e.g. For example, resource region set #0, #1 or #2, #3, #4) or similar to the uplink resource allocation type 0 scheme (e.g., allocation based on a bitmap) continuous or non-contiguous A set of resource areas can also be assigned.

When the terminal is assigned a continuous set of resource regions, for example, similar to the uplink resource allocation type 1, the terminal is expressed as a starting resource region set (RB _start ) of frequency resource allocation and L consecutive resource region sets. It is possible to determine a frequency resource region (or a set of allocated resource regions) allocated as a resource indication value (RIV), in which case the RIV value is as follows. In this case, N may be the total number of resource region sets.

For example, RIV=0 means the first resource region set or resource region set #0, which is PRB #i, #i+10, #i+20, ..., #i+50 of FIG. It may mean that one configured set of resource regions is allocated. In this case, the length (or size or number of bits) of the frequency resource allocation information is equal to ceiling(log ₂ (N(N+1)/2)).

For another example, when a continuous or non-contiguous resource region set is allocated using a bitmap, the L resource region sets constituting the bandwidth portion 820 are assigned in ascending frequency resource order or resource region set index. A bitmap of L bits each indicated in an ascending order is configured, and the base station can allocate a resource region set through the bitmap. For example, in the case of FIG. 8, the location of the resource region set may be indicated through a bitmap composed of 5 bits, and the bitmap 10000 is the first resource region set, that is, PRB #i, #i+10, # of FIG. It means that one resource area set consisting of i+20, ..., #i+50 is allocated. Bitmap 00010 means that the fourth resource region set, that is, PRBs #i+3, #i+8, #i+13, #i+18, ..., #i+48 of FIG. 8 are allocated. In this case, the length (or size or number of bits) of the frequency resource allocation information is equal to L.

- Uplink resource allocation type 3

9 is a diagram showing uplink resource allocation type 3. The uplink resource allocation type 3 scheme is a scheme in which frequency resources for uplink signal or channel transmission are allocated to be distributed over the entire active uplink bandwidth part, and an allocation resource group (or an allocation resource block or allocation resource cluster as a continuous resource) ), for example, 951 or 961) is entirely distributed within the bandwidth portion through a method such as repetitive transmission (eg, 951, 952, 953 to 961, 962, 963). That is, the allocation resource group 951, which is a continuous resource, may exist repeatedly in frequency resources, such as 951, 952, and 953, and thus, a plurality of allocation resource groups may exist in the bandwidth portion. In the uplink resource allocation type 3, since consecutive allocated resource groups (or blocks or clusters) are distributed in a frequency band, a request for frequency allocation such as a power spectral density (PSD) requirement and an occupancy channel bandwidth (OCB) condition It may be limited and applied when transmitting an uplink signal and a channel transmitted in a carrier or cell or a bandwidth portion operating in an unlicensed band requiring condition satisfaction.

Similar to frequency, the terminal may receive the time resource domain of the uplink data channel through the following method. The time resource region of the uplink data channel may be indicated to the terminal through a start and length indicator value (SLIV). SLIV is a value determined by the start symbol (S) of time resource allocation in a slot and L consecutively allocated symbols as follows. If (L-1) is less than or equal to 7, the SLIV value is 14·(L-1)+S, and if (L-1) is greater than 7, the SLIV value is 14·(14-L+1) )+(14-1-S). At this time, the value of L is greater than 0 and less than or equal to 14.

In the case of a system that performs communication in an unlicensed band, a communication device (base station or terminal) that wants to transmit a signal through the unlicensed band is a channel access procedure for the unlicensed band to perform communication before transmitting the signal. ) Or LBT is performed, and when it is determined that the unlicensed band is idle according to the channel access procedure, signal transmission may be performed by accessing the unlicensed band. If it is determined that the unlicensed band is not in an idle state according to the performed channel access procedure, the communication device may not perform signal transmission.

The channel access procedure in the unlicensed band may be classified according to whether the start time of the channel access procedure of the communication device is fixed (frame-based equipment, FBE) or variable (load-based equipment). The communication device may be determined as an FBE device or an LBE device depending on whether the transmit/receive structure of the communication device has one period or does not have a period other than the start time of the channel access procedure. Here, the fact that the start time of the channel access procedure is fixed means that the channel access procedure of the communication device can be periodically started according to a predefined period or a communication device declared or set. As another example, the fact that the start time of the channel access procedure is fixed may mean that the transmission or reception structure of the communication device has one period. Here, that the channel access procedure initiation time point is variable means that the channel access procedure initiation time point of the communication device is possible at any time when the communication device attempts to transmit a signal through an unlicensed band. As another example, the variable initiation time of the channel access procedure may mean that the transmission or reception structure of the communication device does not have one period and may be determined as needed.

Hereinafter, a channel access procedure (hereinafter, a traffic-based channel access procedure or an LBE-based channel access procedure) in a case in which the start time of the channel access procedure of the communication device is variable (load-based equipment, LBE) will be described.

The channel access procedure in the unlicensed band is the unlicensed band for a fixed time by a communication device or a time calculated according to a predefined rule (e.g., at least a time calculated through one random value selected by the base station or the terminal). The received signal strength is measured according to at least one variable among a predefined threshold value, a channel bandwidth, a signal bandwidth to which a signal to be transmitted is transmitted, and/or a transmission power strength. It may include a procedure for determining the idle state of the unlicensed band by comparing it with a threshold calculated by a function that determines the size of.

For example, the communication device measures the strength of the received signal during Xus (e.g. 25us) immediately before the point at which the signal is to be transmitted, and the measured signal strength is a predefined or calculated threshold T If it is less than (eg -72dBm), it is determined that the unlicensed band is in an idle state, and a set signal can be transmitted. At this time, after the channel access procedure, the maximum time for continuous signal transmission may be limited according to the maximum channel occupancy time (MCOT) defined for each country, region, and frequency band according to each unlicensed band. , It may also be limited according to the type of communication device (for example, a base station or a terminal, or a master device or a slave device). For example, in Japan, in a 5GHz unlicensed band, a base station or a terminal may occupy a channel and transmit a signal without performing an additional channel access procedure for a maximum of 4 ms for an unlicensed band determined to be idle after performing the channel access procedure.

More specifically, when the base station or the terminal wants to transmit a downlink or uplink signal in an unlicensed band, the channel access procedure that the base station or terminal can perform may be classified into at least the following types.

-Type 1: Uplink/downlink signal transmission after performing a channel access procedure for a variable time

-Type 2: Uplink/downlink signal transmission after performing channel access procedure for a fixed time

-Type 3: Transmission of downlink or uplink signals without performing a channel access procedure

A transmitting device (eg, a base station or a terminal) that wants to transmit signals in the unlicensed band may determine a method (or type) of a channel access procedure according to the type of signal to be transmitted. In 3GPP, the LBT procedure, which is a channel access method, can be largely divided into four categories. The four categories are a first category that does not perform LBT, a second category that performs LBT without random backoff, and a method of performing LBT through random backoff in a contention window of a fixed size. A third category may include a fourth category, which is a method of performing LBT through random backoff in a contention window of a variable size. According to an embodiment, in the case of type 1, the third category and the fourth category, in the case of type 2, the second category, and in the case of type 3, the first category may be illustrated. In this case, in the case of the type 2 or the second category in which the channel access procedure is performed for a fixed time, it may be classified into one or more types according to the fixed time in which the channel access procedure is performed. For example, type 2 can be divided into a type that performs a channel access procedure for a fixed time Aμs (eg, 25us) and a type that performs a channel access procedure for a fixed time Bμs (eg, 16us).

Hereinafter, in the present disclosure, for convenience of description, the transmitting device is assumed to be a base station, and the transmitting device and the base station may be mixed and used.

For example, when the base station wants to transmit a downlink signal including a downlink data channel in an unlicensed band, the base station may perform a type 1 channel access procedure. And when the base station wants to transmit a downlink signal that does not include a downlink data channel in an unlicensed band, for example, when it wants to transmit a synchronization signal or a downlink control channel, the base station performs a type 2 channel access procedure. And, it is possible to transmit a downlink signal.

In this case, the method of the channel access procedure may be determined according to the transmission length of the signal to be transmitted in the unlicensed band or the length of the time or period used by occupying the unlicensed band. In general, in the type 1 method, the channel access procedure can be performed for a longer time than the channel access procedure in the type 2 method. Accordingly, when the communication device desires to transmit a signal for a short time period or a time period less than or equal to a reference time (eg, Xms or Y symbol), a type 2 channel access procedure may be performed. On the other hand, when the communication device intends to transmit a signal during a long time period or a time exceeding or exceeding a reference time (eg, Xms or Y symbol), a type 1 channel access procedure may be performed. In other words, different channel access procedures may be performed according to the use time of the unlicensed band.

If, according to at least one of the above-described criteria, the transmitting device performs the type 1 channel access procedure, the transmitting device that wants to transmit the signal in the unlicensed band is the quality of service class (QCI) identifier) to determine the channel access priority class (channel access priority class, or channel access priority), and at least one of the predefined setting values for the determined channel access priority type as shown in Table 5 below. The channel access procedure can be performed using. Table 5 below shows the mapping relationship between channel access priority types and QCI. In this case, the channel access priority type and the QCI mapping relationship as shown in Table 5 are only examples, and are not limited thereto.

For example, QCI 1, 2, and 4 are services such as Conversational Voice, Conversational Video (Live Streaming), and Non-Conversational Video (Buffered Streaming), respectively. Means the QCI value for. If a signal for a service that does not match the QCI of Table 5 is to be transmitted to the unlicensed band, the transmitting device may select the service and the QCI closest to the QCI of Table 5 and select a channel access priority type for this.

Channel Access Priority QCI One 1, 3, 5, 65, 66, 69, 70 2 2, 7 3 4, 6, 8, 9 4 -

In various embodiments, a parameter value for a channel access priority type (e.g., a defer duration according to a determined channel access priority p), a contention window value, or a set of sizes (CW _p ) And the minimum and maximum values of the contention period (CW _min,p , CW _max,p ), and the maximum channel occupancy possible period (T _mcot,p ) may be determined as shown in Table 6. Table 6 shows priority to channel access in the case of downlink. Represents the parameter value for the rank type.

For example, a base station that wants to transmit a downlink signal in the unlicensed band may perform a channel access procedure for the unlicensed band for a minimum of T _f + m _p * T _sl time (for example, a delay period). If the base station intends to perform the channel access procedure with the channel access priority type 3 (p=3), m _p =3 for the size of the delay interval required to perform the channel access procedure T _f + m _p *T _sl The size of T _f + m _p *T _sl can be set using. Here, T _f is a fixed value of 16us, of which the first T _sl time must be in an idle state, and the base station may not perform the channel access procedure at the remaining time (T _f -T _sl ) after T _sl time among T _f times. have. In this case, even if the base station performs the channel access procedure in the remaining time (T _f -T _sl ), the result of the channel access procedure may not be used. In other words, the T _f -T _sl time is a time for the base station to delay performing the channel access procedure.

If it is determined that the unlicensed band is idle in both m _p *T _sl times, it may be N=N-1. In this case, N may be selected as an arbitrary integer value among values between 0 and the value of the contention period (CW _p ) at the time point of performing the channel access procedure. In the case of channel access priority type 3, the minimum contention interval value and the maximum contention interval value are 15 and 63, respectively. If it is determined that the unlicensed band is idle in the delay interval and the additional interval for performing the channel access procedure, the base station may transmit a signal through the unlicensed band for a time T _mcot,p (8 ms). In the present disclosure, the description has been made based on the downlink channel access priority class for convenience, but in the case of uplink, the channel access priority class in Table 6 is used the same or a separate channel access priority for uplink transmission Rank classes can be used.

Channel Access Priority Class ( p ) m _p CW _min,p CW _max,p T _mcot,p allowed CW _p sizes One One 3 7 2ms {3, 7} 2 One 7 15 3ms {7, 15} 3 3 15 63 8 or 10ms {15, 31, 63} 4 7 15 1023 8 or 10ms {15, 31, 63, 127, 255, 511, 1023}

The initial contention interval value (CW _p ) is the minimum value (CW _min,p ) of the contention interval. Base stations to select the value of N, performing a channel access procedure in T _sl interval, change the value, N = N-1 When a license-exempt band, determined by the idle state through the channel access procedure performed in a T _sl interval, and N If =0, the signal can be transmitted through the unlicensed band for the maximum T _mcot,p time (or the maximum occupied time). If the unlicensed band determined through the channel access procedure at time T _sl is not in an idle state, the base station may perform the channel access procedure again without changing the N value.

The size of the contention period (CW _p ) is a downlink transmitted through a downlink data channel in a reference subframe, a reference slot, or a reference transmission time interval (reference TTI). Downlink data transmitted or reported by one or more terminals that have received the link data to the base station, that is, downlink received in a reference subframe, a reference slot, or a reference transmission time interval (reference TTI) Among the reception results (ACK/NACK) for data, it may be changed or maintained according to the ratio Z of NACK. At this time, a reference subframe, a reference slot, or a reference transmission time interval (reference TTI) is when the base station initiates a channel access procedure or the base station selects an N value to perform a channel access procedure. The first subframe or slot or the transmission time interval (TTI) of the downlink signal transmission interval (or MCOT) most recently transmitted by the base station through the unlicensed band at the time point or immediately before the two points of time, or the start subframe of the transmission interval, or It may be determined as a start slot or a start transmission time interval.

A terminal transmitting an uplink signal or a channel transmitting an uplink signal in an unlicensed band may receive a detailed instruction from the base station or the terminal may determine a transmission start position or time point (hereinafter referred to as a position) for the uplink transmission. For example, the terminal determines the start symbol of uplink signal transmission transmitted by the terminal in a specific slot from the base station and the length of the uplink signal transmission or the uplink signal transmission start symbol and the uplink signal transmission end symbol by DCI or an upper signal. It can be instructed or set through. In this case, the terminal may additionally receive an indication of a transmission start position within the first symbol of the uplink signal transmission that has been indicated or set.

10 is a diagram illustrating an example of a resource through which a terminal transmits an uplink signal in an unlicensed band. According to FIG. 10, a terminal receiving a DCI (or an uplink grant) indicating or scheduling an uplink signal transmission from a base station uses at least one of the DCI information, for example, time domain resource allocation information. A slot 1000 for transmitting an uplink signal, a symbol 1010 from which transmission of an uplink signal starts in the slot 1000, and a length of the uplink signal transmission or the number of transmission symbols 1020 may be determined.

In this case, in the case of a terminal transmitting an uplink signal in an unlicensed band, a field indicating a transmission start position in the first symbol of uplink signal transmission in the DCI received by the terminal more specifically, for example, an uplink signal Alternatively, a field indicating a start position of channel transmission (UL starting position) may be additionally included. Through the value set through the field, the terminal may more specifically determine the uplink signal transmission start position within the uplink start symbol 1010.

For the above example, the terminal determines a symbol 1010 from which transmission of an uplink signal starts through time domain resource allocation information (for example, a time domain resource assignment field) of the DCI, and additionally starts the uplink signal of the DCI. Whether the uplink signal is transmitted from the start time or position of the symbol 1010 such as a (1040) through position information (UL starting position), or the start of the symbol 1010, such as b (1050) It may be determined whether the transmission is transmitted from a location after a predetermined time 1055 based on the time or location. At this time, as in the above example, it is only an example that the uplink signal transmission position is indicated by dividing into two in the symbol 1010 from which transmission of the uplink signal is started, and it will be possible to distinguish the transmission position into two or more. .

On the other hand, similar to the method of indicating the position at which the uplink transmission starts in the above-described transmission start symbol of an uplink signal or channel, the uplink signal in the transmission end (or last) symbol of an uplink signal or channel It is also possible to indicate the location where the transmission ends. That is, in the case of a terminal transmitting an uplink signal in an unlicensed band, a field indicating the end position of uplink transmission more specifically within the last symbol of the uplink signal transmission to the DCI, for example, an end position of an uplink signal or channel A field indicating (UL ending position) may be included. Through the value set through the field, the terminal may determine an uplink signal transmission end position in the last symbol 1035 of uplink transmission.

According to FIG. 10, the UE determines a symbol at which uplink signal transmission ends or the last symbol 1035 through time domain resource allocation information of DCI, and additionally, the uplink signal through information on the end position of the uplink signal of the DCI. Is transmitted to the end or the last time to the position of the symbol 1035 as in c(1060), or from the start time to the position of the symbol 1035 as in d(1065) to a certain time 1065 You can judge whether it is. At this time, as in the above example, it is only an example that the uplink signal transmission position is indicated by dividing into two in the symbol 1035 at which transmission of the uplink signal is terminated, and it may be possible to distinguish the transmission position into two or more. .

In this case, indicating the uplink signal transmission start or end position additionally in the uplink transmission start symbol or the transmission end symbol as described above, the terminal or the base station can perform a channel access procedure through the transmission start or end position. It is to ensure that a gap between a base station and a terminal, or between a terminal and the terminal, or between a terminal and a signal or channel transmitted by another terminal within a predetermined time or within a predetermined time period.

11 is a diagram illustrating a gap between signals or channels. According to FIG. 11, the gap 1120 between the first signal or channel transmission 1100 and the second signal or channel transmission 1110 is guaranteed within a certain period of time or within a predetermined time according to the above-described additional uplink signal transmission start or end position indication. Alternatively, and/or, a channel access procedure for transmitting a second signal or a channel may be performed within the gap 1120 section. For a more specific example, the base station occupies a channel by performing a second type of channel access procedure, and the terminal may perform uplink signal or channel transmission within the channel occupancy time. At this time, if the gap between transmission of the downlink signal or channel 1100 and transmission of the uplink signal or channel 1110 of the terminal within the channel occupancy time is within a predetermined time (for example, 16 μs), the terminal is type 3 A channel access procedure of (or without performing a separate channel access procedure) may be performed and an uplink signal or a channel 1110 may be transmitted. In this case, the gap may be located at the first symbol for initiating transmission of an uplink signal or channel 1110 of the terminal. If the gap between transmission of the downlink signal or channel 1100 and transmission of the uplink signal or channel 1110 of the terminal within the channel occupancy time is within a predetermined time (for example, 25 μs), the terminal accesses a type 2 channel The procedure may be performed and an uplink signal or channel 1110 may be transmitted.

Therefore, in the present disclosure, the base station and the terminal perform a channel access procedure using at least one of information among a channel access procedure performed for transmission of an uplink signal, a start position of the uplink signal transmission, an end position of the uplink signal transmission, and a slot format indicator. , A method of determining a time resource region to which an uplink signal or channel is allocated, such as the uplink signal transmission start position and the uplink signal transmission end position. In addition, in the present disclosure, when a terminal can be scheduled to transmit one or more uplink data channels for transmitting one or more different transport blocks through one DCI, a channel access performed by the terminal for uplink signal or channel transmission A method of correctly determining a procedure, the uplink signal or channel transmission start position, the uplink signal or channel transmission end position, and a code block group transmission indicator, is provided.

The terminal may transmit capability information on a supported or possible uplink channel access procedure type to the base station. In this case, the terminal may transmit whether or not each type of uplink channel access procedure can be performed or a type of channel access procedure performed by the terminal to the base station through the capability information. At this time, if the terminal must necessarily support some types of uplink channel access procedure types, the terminal may transmit whether or not support for a specific uplink channel access procedure type is possible to the base station through the capacity information. .

Similarly, the terminal may transmit capability information on a supported or transmittable uplink signal transmission start position to the base station. In this case, the terminal may transmit information on whether each of the uplink signal transmission start positions in the symbol can be performed or the uplink signal transmission start position in which the terminal can start transmission to the base station through the capacity information. In this case, when the UE must support some of the start positions of the uplink signal transmission start positions, the UE may communicate whether the uplink signal transmission can be started at a specific position to the base station through the capacity information.

Similarly, the terminal may transmit capability information on a supported or transmittable uplink signal transmission end position to the base station. In this case, the terminal may transmit information on whether each uplink signal transmission end position in the symbol can be performed or an uplink signal transmission end position at which the terminal can end transmission to the base station through the capacity information. In this case, when the terminal must necessarily support the end position of some of the uplink signal transmission end positions, the terminal may transmit whether the uplink signal transmission can be terminated at a specific position to the base station through the capacity information.

In addition, the terminal supports at least one of whether a function of transmitting one or more different transport blocks through one or more uplink data channel transmission through one DCI, or whether a code block group-based uplink data channel transmission function is supported. Capability information about whether or not a function can be supported may be delivered to the base station. In this case, the terminal additionally has the capacity for the maximum number of transport blocks that the terminal can transmit through one DCI, the maximum number of uplink data channels that can be scheduled through one DCI, or the maximum number of code block groups. (capability) information can be delivered to the base station.

Hereinafter, in the present invention, the types of uplink channel access procedures that the UE can support, the uplink signal transmission start position in the symbol, the uplink signal transmission end position in the symbol, and one or more different transport blocks through one DCI. Transmits at least one capacity information of whether a function that can be transmitted through channel transmission is supported or whether code block-based transmission is possible, and based on this, the terminal transmits one or more types of uplink channel access procedures and uplink signals within symbols. It is assumed that the start position, the end position of uplink signal transmission in the symbol, the function of transmitting one or more different transport blocks through one or more uplink data channel transmission through one DCI, and the case of using code block-based transmission I will explain. In this case, the present invention may be applicable even when the terminal does not transmit at least one or more of the capacity information to the base station.

Meanwhile, the capacity may be independent according to a frequency band or a combination of frequency bands. For example, in the case of a 5 GHz frequency band, the type 1 and type 2 channel access procedures, and in the 6 GHz frequency band, the capacity for the type 1, type 2, and type 3 channel access procedures may be defined. In addition, the UE transmits one or more different transport blocks through one or more uplink data channel transmissions through the type of uplink channel access procedure, the uplink signal transmission start position in the symbol, the uplink signal transmission end position in the symbol, and one DCI. Whether or not a function capable of transmission is supported, or whether at least one or more of code block-based transmission is determined according to one of the various methods proposed in the present disclosure or a combination of one or more methods, or a combination of one or more methods proposed in the present disclosure It is also possible to judge independently.

Hereinafter, in various embodiments of the present disclosure, the present invention will be described on the assumption that a terminal receives one or more PDSCH receptions or PUSCH transmissions scheduled from a base station through one DCI. Accordingly, DCI described in various embodiments of the present disclosure hereinafter refers to DCI for scheduling one or more PDSCH reception or PUSCH transmission through one DCI as described above. More specifically, the one DCI is a DCI capable of scheduling N1 PDSCH reception or PUSCH transmission in N1 slots (i.e., corresponding to a DCI scheduling one PDSCH or PUSCH per slot), or N in N1 slots DCI capable of scheduling PDSCH reception to PUSCH transmission (in this case, N=N1, corresponding to DCI scheduling one or more PDSCHs or PUSCHs per slot), or scheduling N PDSCH reception to PUSCH transmission It can be interpreted as DCI, which means at least one case of DCI.

In this case, at least one of the values of N to N1 may be a natural number equal to or greater than 1. When at least one of the values of N to N1 includes 1, one or more PDSCH reception or PUSCH transmission can be scheduled in one or more slots through such DCI, so that one slot or one PDSCH reception or PUSCH transmission is scheduled. There is an advantage that the DCI and the DCI can be used without distinction. That is, the base station may schedule one or more PDSCH reception or PUSCH transmission per slot in one DCI format.

If, in one or more slots, a DCI capable of scheduling two or more PDSCH reception or PUSCH transmission and another DCI that schedules one slot or one PDSCH reception or PUSCH transmission are used or configured separately (this is different DCI It may be understood that the format is used), at least one of the values of N to N1 may be a natural number value greater than 1. On the other hand, even if a DCI capable of scheduling one or more PDSCH reception or PUSCH transmission in one or more slots and another DCI that schedules one or more PDSCH reception or PUSCH transmission in one or more slots are used or configured separately, the N to N1 At least one of the values may be a natural number equal to or greater than 1. Meanwhile, the terminal receives at least one of the maximum values of N (the number of PDSCHs or PUSCHs scheduled by DCI) to N1 (the number of slots including PDSCHs or PUSCHs scheduled by DCI) is set through a higher signal, and the The value of N or/and N1 that DCI actually schedules may be indicated or set through the DCI.

Hereinafter, in various embodiments of the present disclosure, a description will be made on the assumption that a terminal receives one or more PUSCH transmissions scheduled through one DCI. However, according to various embodiments of the present disclosure, a terminal receives one or more PDSCHs through one DCI. It will be applicable even if it is scheduled.

In the case of a UE in which retransmission per code block group for an uplink data channel is configured, a code block group transmission information (CBGTI) field consisting of M bits indicating which code block group should be transmitted to the DCI scheduling transmission of the uplink data channel ( Or information) may be included. In this case, the size M of the information may be determined through at least one of the following methods.

Method 1: The UE determines CBGTI information by additionally considering one or more fields of the DCI

Method 1 is a method in which the UE determines the actual size of CBGTI information by considering the value of one or more fields other than the CBGTI field of the DCI. For example, in a DCI capable of scheduling maximum N PDSCH reception or PUSCH transmission, N bits for indicating a new data indicator (ND) for N PDSCHs or PUSCHs (i.e., 1 bit per PDSCH or PUSCH) The NDI field of may be included. In this case, the N-bit NDI means a new data indicator for the N PDSCHs or PUSCHs scheduled in the DCI, and may be configured in an ascending order of HARQ process IDs of the PDSCH or PUSCH.

Similarly, in a DCI capable of scheduling up to N PDSCH reception to PUSCH transmission, 2N bits (that is, 2 bits per one PDSCH or PUSCH) for indicating a redundant version (RV) for N PDSCHs or PUSCHs. Field may be included. In general, the 2-bit RV value can be one of 0, 1, 2, and 3, and one of these values can be indicated through DCI. In this case, the RV field of the DCI capable of scheduling a plurality of PDSCH reception or PUSCH transmission may have a size smaller than 2N bits, thereby minimizing the size of the DCI. For example, an RV field that can indicate a total of four values is limited or reinterpreted to indicate a maximum of two values in the DCI to have a RV field value of 1 bit per PDSCH or PUSCH. can do. For example, the base station may indicate one of the RV values 0 or 2 through the DCI through the 1-bit RV field, or indicate one of the RV values 0 or 3 through the DCI. In this case, the RV value that can be indicated by the 1-bit RV field may be defined in advance between the base station and the mobile station, or the base station may set it to the mobile station through an upper signal. In this case, the RV value 0 is always included, and it is also possible for the base station to set only the additional RV value to the terminal through an upper signal. In this case, an N-bit RV field for indicating a redundant version (RV) for N PDSCHs or PUSCHs may be included in a DCI capable of scheduling up to N PDSCH reception to PUSCH transmission. In this case, a DCI capable of scheduling a maximum of one PDSCH reception to a PUSCH transmission, or in this case, a 2-bit RV field may be included.

Assuming the above example, the sizes of the NDI and RV fields of the DCI capable of scheduling maximum N PDSCH reception or PUSCH transmission are N bits. If the number of PUSCHs actually scheduled by the DCI is K, the last NK bit (or NK least significant bits (LSB)) of the NDI and RV fields is an unused bit or a bit that does not contain any information to be. In other words, when the number of PUSCHs actually scheduled by the DCI is K, the K bits (or K most significant bits (MSBs) from the beginning of the NDI and RV fields) are sequentially assigned to the K PUSCHs scheduled by the DCI. The NDI and RV information, or the NK LBS bit of each of the fields may be determined as a bit that is not used for the terminal or a bit that does not contain any information.

Method 1 is a method for the UE to reinterpret or determine the N-K bit as CBGTI information in the above case. In this case, the UE may determine by adding the N-K bit information to the CBGTI information M bits determined through at least one or more of Method 5 in Method 2 below. That is, the UE may determine that the size of the CBGTI field of the DCI is M+2 (N-K) bits.

In this case, the UE may determine CBGTI information using some bits of the NDI and RV fields without a separate CBGTI field included in the DCI, and at this time, the CBGTI information may have 2 (N-K) bits. If the N-K bit is 0, that is, when the DCI schedules N PUSCHs, the UE may determine that transmission or retransmission in units of code block groups according to the DCI is not performed. This is the same as determining that all PUSCHs scheduled by the DCI are TB-based transmission or retransmission.

Method 1 will be described in more detail with reference to FIG. 12 as follows.

12 is a diagram illustrating an example of DCI scheduling one or more slots or PUSCHs. Referring to FIG. 12, as an example, a 1-bit DCI format identifier (Identifier for DCI formats, 1200), a 0 or 3-bit carrier indicator (1205), 0 in the total size of the DCI information to all bits 1295. , 1 or 2 bit bandwidth part indicator (Bandwidth part indicator, 1215), frequency domain resource assignment related information (frequency domain resource assignment, 1220) whose field size is determined according to the size of the bandwidth part, the DCI scheduling Field 1225 indicating the number of slots to the number of PUSCHs K value, time domain resource assignment information (1230) of the scheduled PUSCH, NDI 1240 consisting of N bit strings, N bit strings Configured RV 1250, HARQ process ID information (HARQ process ID, 1260), CBGTI 1270 composed of M to M1 bits, 0 added to the LSB of the DCI to match the size with another DCI (padded bit, 1290) and the like.

At this time, the UE indicates that the HARQ process ID P indicated by the HARQ process ID information 1260 included in the DCI is the PUSCH scheduled to be located first (that is, earliest) among the PUSCHs scheduled by the DCI. It may be determined that it is a HARQ process ID for, and it may be determined that the HARQ process IDs for the remaining N-1 PUSCHs are sequentially increased by 1 in chronological order. That is, in the case of FIG. 12, the terminal receiving the DCI may determine that four PUSCH transmissions are scheduled (K=4) through the value of the K value indication field 1225 of the DCI, and the DCI indicated It may be determined that the HARQ process ID P is sequentially increased by 1 from P and allocated to the scheduled PUSCH. That is, the UE has a HARQ process ID for PUSCH#0 P, a HARQ process ID for PUSCH#1 is P+1, a HARQ process ID for PUSCH#2 is P+2, and a HARQ process ID for PUSCH#3 is P+3. Can be judged as.

At this time, the HARQ of the PUSCH through a modulo operation (for example, P=MOD(P, Z)) between the maximum number of HARQ process IDs that can be set (Z) and the indicated or determined HARQ process ID P. Process ID P can be determined. For example, in the case where the maximum number of HARQ process IDs that can be set is 8, when HARQ process ID P=6 is indicated by the DCI, PUSCH corresponding to HARQ process ID 6 is PUSCH#0, and HARQ process ID The next PUSCH corresponding to 7 may be PUSCH#1, the next PUSCH corresponding to HARQ process ID 0 may be PUSCH#2, and the next PUSCH corresponding to HARQ process ID 1 may be PUSCH#3.

12 illustrates a case in which the terminal receives a value of 8, the maximum number of PUSCHs, N, which the DCI can schedule from the base station through an upper signal. Accordingly, at least NDI 1240 and RV 1250 information among the DCI fields is indicated by an 8-bit column, and each bit is a new data indicator and a redundant version for a PUSCH scheduled by the DCI or a HARQ process ID corresponding thereto. Corresponds to information. Meanwhile, the terminal schedules four PUSCH transmissions (PUSCH#0, PUSCH#1, PUSCH#2, PUSCH#3) by the DCI through K indication information 1225, which is the number of PUSCHs scheduled by the DCI, that is, It may be determined that K=4 according to the value of the field. Therefore, the remaining bits excluding the 4 MSBs (1241, 1242, 1243, 1244) of the 8-bit NDI (1245, 1246, 1247, 1248) and the 4 MSBs (1251, 1252, 1253, 1254) of the RV (1255, 1256, 1257, 1258) is not information about the NDI and RV for the PUSCH scheduled by the DCI, is a fixed value, or is not used to indicate the NDI and RV information for the PUSCH.

Accordingly, method 1 is a method of using part or all of the information that has not been actually used as CBGTI information, or reinterpreting part or all of the information that has not been actually used as CBGTI information according to the number of actually scheduled PUSCHs. According to the example of FIG. 12, the terminal has a total of 12 bits of CBGTI information (the CBGTI field (or CBGTI information, 1270)), some information of NDI (1245, 1246, 1247, 1248) and some information of RV (1255, 1256). , 1257, 1258)).

At this time, the terminal has CBGTI information in the CBGTI information 1270 previously included in the DCI, the partial information of the NDI (1245, 1246, 1247, 1248) and the partial information of the RV (1255, 1256, 1257, 1258) all Can be determined as one CBGTI information. That is, in the above example, the terminal may determine that the CBGTI information is a total of 12 bits.

In another method, the terminal includes the CBGTI information 1270 previously included in the DCI, the partial information of the NDI (1245, 1246, 1247, 1248), and the partial information of the RV (1255, 1256, 1257, 1258), respectively. It may be determined that it is CBGTI information for at least one PUSCH. For example, during PUSCH transmission scheduled by the DCI, the UE is in ascending order of PUSCH#0, PUSCH#1, PUSCH#2, or HARQ process ID P, HARQ process ID P+1, and HARQ process ID P+2 for this. Each of the CBGTI information can be applied. Alternatively, the UE may apply the CBGTI information to the PUSCH indicated to be retransmission by NDI in chronological order of PUSCH transmission or in ascending order of HARQ process ID. For example, CBGTI information 1270 is CBGTI information for PUSCH#0, the partial information 1245, 1246, 1247, and 1248 of NDI is CBGTI information for PUSCH #1, and the partial information of RV (1255, 1256, 1257) , 1258) may be determined to be CBGTI information for PUSCH#2.

As another method, one field including all of at least NDI, RV, and CBGTI information is configured in the DCI, and the information of the field is applied according to the number of actually scheduled PUSCHs. Referring to the example of FIG. 12, the field may be a field having a size of 2N+M1 bits, which is the sum of NDI of N bits, RV of N bits, and CBGTI of M1 bits (the number of such bits is 20 Can be a bit). According to the actually scheduled number of PUSCHs K, the K MSB of the 2N+M1 (for example, 20 bits) information is NDI for K PUSCHs, and the next K bits are RV information for K PUSCHs, the remaining bits ( For example, N+N+M1-KK or 12 bits) may be determined to be CBGTI information for at least one retransmission PUSCH among the scheduled PUSCHs.

Method 2: The UE determines the number of bits in the CBGTI field based on the maximum number of code block groups for each TB set through the higher signal.

Method 2 is a method in which the UE determines the size M of the field according to the maximum number of code block groups for each TB, M1, (eg, maxCodeBlockGroupsPerTransportBlock field ) set through a higher signal. That is, according to Method 2, the UE may determine the size M of the CBGTI field as M1. For example, the terminal may receive the maximum number of code block groups for each TB as one of 0, 2, 4, 6, or 8 from the base station through an upper signal. At this time, if 2 TB transmission or reception is set for the terminal, or the maximum number of uplink transmission or downlink reception possible layers is set to 5 or more, the terminal may be set to a maximum of 4 as the maximum number of code block groups per TB. I can. In this case, 0, 2, 4, 6 or 8, which is the maximum number of code block groups for each TB, is only an example, and the contents of the present invention are not limited thereto.

At this time, a DCI capable of scheduling one or more PDSCH reception or PUSCH transmission in one or more slots and another DCI scheduling a PDSCH reception or PUSCH transmission in one slot, or one PDSCH reception or PUSCH transmission are distinguished. Consider when to be used or set. This means that different DCI formats may be used in the above two cases, or a DCI format capable of scheduling one or more PDSCHs or PUSCHs and a DCI format scheduling one PDSCH or PUSCH exist differently. can do. For each DCI, the size of the CBGTI field may be independent.

This is, when scheduling a plurality of PDSCH reception or PUSCH transmission in one or more slots, when a PDSCH reception or PUSCH transmission in one slot, or a PDSCH reception or PUSCH transmission is scheduled, the maximum number of code block groups per TB is independent. It means that it can be determined or set. For example, when the base station schedules one slot or one PDSCH reception or PUSCH transmission in one DCI, or in the case of DCI scheduling the case, the maximum number of code block groups per TB is set to 4, and the base station is one In the case of scheduling one or more PDSCH receptions or PUSCH transmissions in one or more slots with one DCI or in the case of a DCI scheduling the case, the maximum number of code block groups per TB may be independently set to 8. The information on the maximum number of code block groups per TB may be set for each DCI format through an upper layer signal. In the above example, the size of the CBGTI field of each DCI will consist of 4 and 8 bits, respectively.

Method 3: This is a method in which the size of the CBGTI field is determined according to values of N1 to N.

Method 3 is the maximum number of code block groups M1 for each TB that the UE has set through a higher signal (e.g., maxCodeBlockGroupsPerTransportBlock field ) and N1 (the maximum number of slots in which the PDSCH or PUSCH scheduled by the DCI is transmitted) to N (the maximum number of PDSCHs or PUSCHs that the DCI can schedule). This is how the size of the CBGTI field is determined. For example, the size of the CBGTI field of the DCI may be determined by multiplying the maximum number of code block groups for each TB and a value of N1 or N. As another example, the size of the field may be determined through a function that takes as factors the maximum number of code block groups per TB and values A1 to A previously defined or additionally set through an upper signal. In this case, the values A1 to A mean the number of slots (A1) to the number of PUSCHs (A) in which retransmission is possible in units of code block groups through the DCI among N1 slots to N PUSCHs that can be scheduled through the DCI. do. The values A1 to A may be defined in advance between the base station and the terminal or may be set through an upper signal, and values A1 to A are equal to or smaller than values N1 to N, respectively. As another example, the size of the CBGTI field is determined using the maximum number of code block groups per TB and K (the number of PDSCHs or PUSCHs scheduled by DCI) or the number of retransmission PDSCHs or PUSCHs scheduled by DCI determined according to NDI. It could also be possible.

For example, a terminal in which the maximum number of code block groups for each TB (M1) and the maximum number of PUSCHs that can be scheduled through the DCI (N) are set to 4, the maximum number of code block groups for each TB (M1) and It can be determined that the size of the CBGTI field of the DCI is 16 bits through a multiplication operation of the maximum number of PUSCHs (N) that can be scheduled with the DCI. For another example, the terminal having the maximum number of code block groups for each TB (M1) and the number of PUSCHs that can be retransmitted in a CBG unit among PUSCHs that can be scheduled through the DCI (A) is set to 4 and 2, respectively, It can be determined that the size of the CBGTI field of the DCI is 8 bits by multiplying the maximum number of code block groups (M1) per code block group and the number of PUSCHs capable of retransmission in units of code block groups (A).

Method 4: The M value is set through the upper signal.

Method 4 is a method in which the UE directly sets the size M value of the CBGTI field through an upper signal, and has the advantage that the base station can freely change the size of the CBGTI field as needed.

Method 5: M value is determined based on the total size of the DCI.

Method 5 is a method in which the UE determines the size of the CBGTI field of the DCI based on the total size of the DCI. For example, the UE may determine that the size of the DCI (Z) is set through an upper signal from the base station, or that the size of the DCI (Z) is the same size as that of another DCI (Z1). For example, the base station inserts 0 (or zero padding) after the valid information of the DCI so that the size of the DCI (Z) is the same as the size of the DCI scheduling PDSCH reception (Z1), and the size of the two DCIs Can be made equal. Through this, the terminal can minimize the operation required for DCI detection. As an example, the terminal attempts to detect and detects only DCI having one size, and the detected DCI is determined from RNTI to at least one field in the detected DCI (for example, DCI format identifier). DCI scheduling PDSCH reception, DCI scheduling PUSCH transmission, or DCI for another purpose can be distinguished.

In this case, the UE may determine that the remaining bits minus valid information from the size of the entire DCI (Z) using Method 5, for example, the number of bits (Z2) that could be zero padded, are the CBGTI fields. . At this time, the valid information does not include the CBGTI field. As another example, the terminal includes the size (M) of the CBGTI field determined according to at least one or more of the methods of method 1 to method 4 in valid information of the DCI, and information valid in the size of the total DCI (Z) The remaining bits minus, for example, Z2 bits that could be padded with zero may be determined as additional CBGTI information. That is, in the above case, the size of the CBGTI information is M+Z2. In order to use the zero-padded bit as a CBGTI field, the CBGTI field of the DCI may be located at the last among valid information fields of the DCI.

In this case, in the methods for determining the size of CBGTI information or field proposed through the present disclosure, DCI capable of scheduling one or more PDSCH reception or PUSCH transmission in one or more slots and PDSCH reception or PUSCH transmission in one slot, Alternatively, when one PDSCH reception or another DCI scheduling PUSCH transmission is used or configured separately, the size of the CBGTI field of each DCI may be independent. This means that when scheduling a plurality of PDSCH reception or PUSCH transmission in one or more slots, and when scheduling one slot or one PDSCH reception or PUSCH transmission, the maximum number of code block groups for each TB can be independently determined or set. do. For example, when the base station schedules PDSCH reception or PUSCH transmission in one slot slot, or one PDSCH reception or PUSCH transmission with one DCI, or in the case of DCI scheduling the case, the maximum code block group for each TB The number is 4, and when the base station schedules a plurality of PDSCH receptions or PUSCH transmissions with one DCI or a DCI scheduling the above case, the maximum number of code block groups per TB may be independently set to 8. The information on the maximum number of code block groups per TB may be set for each DCI format through an upper layer signal. In the above example, the size of the CBGTI field is composed of 4 and 8 bits, respectively.

In the following, the present disclosure proposes a method for the UE to perform PUSCH transmission using the size of the CBGTI field determined by the UE through the above various methods.

Method A described below is a method in which the UE performs PUSCH transmission by using CBGTI information composed of M bits determined through at least one of methods 1 to 5. In this case, the UE may sequentially apply M-bit CBGTI information of DCI to K1 retransmission PUSCHs (or PUSCHs in which NDI is not toggled) among K PUSCHs scheduled by the DCI.

The method A will be described in detail as follows. As in the example of Method 1, the terminal may receive the maximum number of PUSCHs N that DCI can schedule from the base station through an upper signal. Here, it is assumed that the value of N is 8. In this case, it is assumed that the maximum number of code block groups (eg, maxCodeBlockGroupsPerTransportBlock) is set to 4. Meanwhile, the DCI may include a field (e.g., numberofPUSCHperDCI) indicating or setting the number K of PUSCHs actually scheduled by the terminal, through which the terminal can determine how many PUSCHs the DCI schedules. have. In the above example, it is assumed that K is 4, and the scheduled PUSCHs are sequentially denoted as PUSCH#0, PUSCH#1, PUSCH#2, and PUSCH#3.

Meanwhile, in the present disclosure, the sequential PUSCH#k means an ascending order of HARQ process IDs allocated to each PUSCH. For example, when the DCI indicates HARQ process ID P, PUSCH corresponding to HARQ process ID P is PUSCH#0, PUSCH corresponding to HARQ process ID P+1 is PUSCH#1, and HARQ process ID P+2 The PUSCH corresponding to is PUSCH #2, and the PUSCH corresponding to the HARQ process ID P+3 may be indicated as PUSCH #3. At this time, through a modulo operation (eg, P=MOD(P,Z)) between the maximum number of HARQ process IDs that can be set (Z) and the indicated or determined HARQ process ID P HARQ process ID P may be determined. For example, when the maximum number of HARQ process IDs that can be set is 8, when HARQ process ID 6 is indicated by the DCI, PUSCH corresponding to HARQ process ID 6 corresponds to PUSCH#0, HARQ process ID 7 The next PUSCH to be PUSCH #1, the next PUSCH corresponding to the HARQ process ID 0 is PUSCH #2, the next PUSCH corresponding to the HARQ process ID 1 may be indicated as PUSCH #3. It can be called an in PUSCH.

In this case, the UE may determine an initial transmission PUSCH and a retransmission PUSCH among K PUSCHs through whether to toggle the NDI value of the DCI. For example, among the PUSCHs corresponding to the same HARQ process ID as the previous transmission, the PUSCH whose NDI value is not toggled or the PUSCH corresponding to the HARQ process ID is determined as a retransmission PUSCH, and the PUSCH whose NDI value is toggled The PUSCH corresponding to the HARQ process ID may be determined as an initial transmission PUSCH. According to the above method, the UE may determine that K1 PUSCHs among the retransmission PUSCHs sequentially perform retransmission in units of code block groups according to the determined CBGTI information.

At this time, the maximum value of K1 (i.e., the maximum value of the retransmission PUSCH that can be scheduled by one DCI, K1 _max ) is defined as a specific value in advance (for example, K1 _max = 1), or the terminal sets the value It can be set through an upper signal from the base station. In addition, the K1 _max value may change according to N, which is the maximum number of PUSCHs that the DCI can schedule. For example, in the case of N=2, K1 _max =1, in the case of N=4, K1 _max =2, in the case of N=8, K1 _max =4 is defined in advance, or the terminal uses the upper signal Can be set. When the maximum value of K1 is defined or set as described above, the value of K1 may be determined as min (K1, K1 _max ).

In this case, the K1 value may be determined through floor (M/maxCodeBlockGroupsPerTransportBlock) or ceil (M/maxCodeBlockGroupsPerTransportBlock). Here, M is the size of the CBGTI information determined through at least one or more of Method 2 to Method 5, and maxCodeBlockGroupsPerTransportBlock is the maximum number of code block groups for each TB (M1) that the UE has set through an upper signal from the base station. floor(x) is the largest integer value not greater than x, and ceiling (x) is the smallest integer value not less than x. For example, if the size M of the CBGTI information is 8 bits and M1 is 4, the number K1 of PUSCHs to which the CBGTI information is applied may be 2. In this case, 4 MSBs among 8 bits of CBGTI information may be applied to the first PUSCH among retransmission PUSCHs, and 4 bits after 4 MSB may be applied to the second PUSCH among retransmission PUSCHs.

Meanwhile, when CBGTI information is determined according to Method 1 described above, PUSCH transmission using the CBGTI may be performed in the following manner. 13 is a diagram illustrating an example of a method of performing PUSCH transmission using CBGTI information. Referring to FIG. 13, the UE includes a CBGTI field 1370 previously included in the DCI, the partial information 1345, 1346, 1347, 1348 of the NDI 1340, and the partial information 1355, 1356 of the RV 1350. , 1357, 1358) information may be determined to be CBGTI information for at least one PUSCH, respectively. For example, during PUSCH transmission scheduled by the DCI, the UE is in ascending order of PUSCH#0, PUSCH#1, PUSCH#2, or HARQ process ID P, HARQ process ID P+1, and HARQ process ID P+2 for this. Each of the CBGTI information can be applied. For example, the CBGTI field 1370 includes CBGTI information for PUSCH#0, the partial information of NDI (1345, 1346, 1347, 1348), CBGTI information for PUSCH#1, and the partial information of RV (1355, 1356). , 1357, 1358) information may be determined to be CBGTI information for PUSCH#2.

At this time, the UE has a CBGTI field 1370, CBGTI information for PUSCH#0, the part of NDI information (1345, 1346, 1347, 1348) is CBGTI information for PUSCH#1, and the part of RV information (1355, 1356, 1357, 1358) It is only an example to determine that the information is CBGTI information for PUSCH#2, and the present invention is not limited to this example. For example, in the UE, the partial information (1345, 1346, 1347, 1348) of the NDI is the CBGTI information for PUSCH#0, and the partial information of the RV (1355, 1356, 1357, 1358) information is the PUSCH#1. It may be determined that the CBGTI information and the CBGTI field 1370 are CBGTI information for PUSCH#2. For another example, the terminal determines information that can be determined as the CBGTI information (eg, 1345, 1346, 1347, 1348, 1355, 1356, 1357, 1358, 1370) in the order included in the DCI 1395 It is possible to configure and sequentially apply the determined CBGTI information to the retransmission PUSCH to determine CBGTI information corresponding to each retransmission PUSCH. For example, in the DCI, bits that can be CBGTI information in the order of some information of the NDI (1345, 1346, 1347, 1348), the partial information of the RV (1355, 1356, 1357, 1358), and the CBGTI field 1370 In this case, the UE configures the CBGTI information in the above order. In this case, the UE reinterprets the CBGTI information of the M bits of the DCI and retransmits PUSCHs (or PUSCHs in which NDI is not toggled) among the K PUSCHs scheduled by the DCI ) It is also possible to sequentially apply to all or K1 PUSCHs. Specifically, the UE may be configured with a maximum number of PUSCHs N that DCI can schedule through a higher signal. Here, it is assumed that the value of N is 8. In this case, it is assumed that the maximum number of code block groups (eg, maxCodeBlockGroupsPerTransportBlock) is set to 4. Meanwhile, the DCI may include a field (e.g., numberofPUSCHperDCI) indicating or setting the number K of PUSCHs actually scheduled by the terminal, through which the terminal can determine how many PUSCHs the DCI schedules. have. In the above example, it is assumed that K is 4, and these are sequentially indicated as PUSCH#0, PUSCH#1, PUSCH#2, and PUSCH#3.

If the CBGTI information determined above is 8 bits (M=8) and it is determined that all the PUSCHs are retransmission PUSCHs, the UE may reinterpret the CBGTI field according to the number of retransmission PUSCHs. In the case of the above example, since the CBGTI information is 8 bits (M=8) and the number of retransmitted PUSCHs is 4, the UE may determine that 2 bits of the CBGTI information are the CBGTI information of each PUSCH in sequence. That is, of the 8-bit CBGTI, the first 2 bits are the CBGTI information of PUSCH#0, the next 2 bits are the CBGTI information of PUSCH#1, the next 2 bits are the CBGTI information of PUSCH#2, and the next 2 bits are PUSCH# It can be determined that it is the CBGTI information of 3.

At this time, since the terminal has received the maximum number of code blocks (M1) for each TB as 4, CBGTI information of 4 bits for each PUSCH is required. However, in the above example, since the CBGTI for each PUSCH is 2 bits, in this case, the UE needs to reinterpret CBGTI information. For example, the UE determines that the first bit of the determined 2-bit CBGTI information is the CBGTI information for the code block groups #0 and #1 determined according to the maximum number of code block groups, and among the 2-bit CBGTI information The second bit may be determined as CBGTI information for code block groups #2 and #3. That is, if the 2-bit CBGTI information is 10, the terminal determines that the DCI is a DCI scheduling transmission of the code block group #0 and the code block group #1 among the code block groups of each PUSCH, and accordingly, the code block Group-based transmission can be performed.

If this is generalized, the UE can determine the CBGTI information of the DCI as follows. The UE is among the K1 retransmission PUSCHs scheduled through the DCI, HARQ process ID sequentially, or PUSCH transmission start time sequentially, among the first K1 ₁ PUSCH (where K1 ₁ = mod(M, K1) or M mod K1) The CBGTI information for each PUSCH may be determined to be M1 ₁ =ceil (M/K1) bits sequentially from the most significant bit string (MSB) of the M-bit CBGTI information. K1 of retransmission remaining K1 ₂ different PUSCH (where K1 ₂ = K1 - K1 _1), except for _one K1 of the PUSCH CBGTI information for each PUSCH of the _{M1 2 = floor ((M-} K1 1 · ceil (M / K1) )/K1 ₂ ) It can be determined as being a bit. For example, if the total CBGTI information is 22 bits (M=22) and the number of retransmitted PUSCHs is 5 (i.e., K1=5), K1 ₁ becomes 2 and M1 ₁ becomes 5, so the UE is PUSCH#0, PUSCH#1 5 bits of CBGTI information is applied from the MSB, and K1 ₂ is 3 and M1 ₂ is 4, so 4 bits of CBGTI information are applied to PUSCH#2, PUSCH#3 and PUSCH#4 (after the above 10 bits). It can be determined that it is.

The UE may determine a code block group in which the DCI instructs retransmission using the determined CBGTI information for each PUSCH (M1 ₁ to M1 ₂ values) and the maximum number of code blocks for each TB (M1). For example, if M1=4, but M1 ₁ to M1 _{2, which} are CBGTI information for the determined PUSCH, is 2, the UE sequentially sets M1/M ₁ or M1/M1 ₂ code block groups for each PUSCH. It may be determined that it is a code block group in which retransmission can be indicated by the CBGTI information. That is, for a PUSCH composed of up to four code block groups, when M1 ₁ to M1 ₂ is 2 and the CBGTI information is 10, the terminal determines that the DCI is the code block group index #0 of the PUSCH and the code block group. It can be determined that index #1 has been instructed to retransmit.

In this case, M1 may be a minimum value of M1 of the maximum code block group index set to the terminal and the number (C) of code blocks constituting the PUSCH, M1 _min = min (M1, C). Generalizing this, the UE is among the CBGTI information for each PUSCH determined as the determined M1 ₁ or M1 ₂ , M2 bits in the order of the most significant bits (where M2 = (M1 or M1 _min ) mod (M1 ₁ or M1 ₂ ) ) Is one of ceil(M1/M1 ₁ ) or ceil(M1 _min /M1 ₁ ) or ceil(M1/M1 ₂ ) or ceil(M1 _min /M1 ₂ ) among the code block groups of M1 to M1 _min of the PUSCH, respectively It may be determined that it is information on the number of code block groups of the determined value M1 ₃ . Similarly, the UE has the remaining M1 ₁ -M2 or M1 ₂ -M2 bits, respectively, of the code block groups of M1 to M1 _min of the PUSCH, floor((M1-M2·M1 ₃ )/(M1 ₁ -M2)) or floor((M1 _min -M2·M1 ₃ )/(M1 ₁ -M2)) or floor((M1-M2·M1 ₃ )/(M1 ₂ -M2)) or floor((M1 _min -M2·M1 ₃ ) It can be determined that it is information about the number of code block groups /(M1 ₂ -M2)).

In this case, in various embodiments of the present disclosure, when one DCI schedules one or more PDSCH reception or PUSCH transmission, a method for the base station to more efficiently transmit CBGTI information to the terminal, and the terminal receiving the CBGTI information correctly. Through this, a method of performing code block group transmission for at least one PDSCH reception or PUSCH transmission was proposed. In addition to this, in various embodiments of the present disclosure, one or more PDSCH reception or PUSCH scheduling through the DCI using the CBGTI information, or information that is not partially used or does not indicate actual information among NDI or RV information as in Method 1 A method used to indicate additional MCS information, HARQ process ID information, etc. for transmission is proposed.

For example, if one or more PDSCH receptions or PUSCH transmissions scheduled by the DCI are all initial transmissions, the UE determines that all of the CBGTI information 1270 is 1 even if there is no CBGTI information 1270 and receives TB-based PDSCH Alternatively, PUSCH transmission or PDSCH reception or PUSCH transmission for all code block groups may be performed. In addition, as described in Method 1, some of the NDI and RV information according to the actually scheduled number of received PDSCHs or the number of transmitted PUSCHs is information that is not used for the PDSCH reception or PUSCH transmission.

14 is a diagram illustrating an example of a method of indicating additional MCS or HARQ process ID information through the DCI. According to FIG. 14, in the above case (when all PDSCH reception or PUSCH transmission is initial transmission and/or some information of NDI and RV information is not used for PDSCH reception or PUSCH transmission), the terminal is a CBGTI field of the DCI. (1470) And/or some of the NDI and RV information may be determined as additional MCS information or HARQ process ID. For example, when DCI scheduling up to 8 PUSCHs schedules transmission of 4 PUSCHs (the number of scheduled PUSCHs K = 4), if all the PUSCHs are initial transmission, the UE has a CBGTI field (1470) And/or some of the NDI and RV information (1480, 1490) is determined to be additional MCS information other than the MCS information included in the DCI, and the MCS information is at least one PUSCH among the scheduled PUSCHs, for example The second scheduled PUSCH (PUSCH#1) (in this case, the MCS of the first scheduled PUSCH (PUSCH#0) is determined according to the MCS field of the DCI) or the second scheduled PUSCH and the subsequent PUSCH (PUSCH #1, PUSCH#2, PUSCH#3), or floor (K/2) or ceil (K/2)-th scheduled PUSCH and MCS values for PUSCHs thereafter (in this case, the MCS field of DCI in the previous PUSCH MCS information of may be applied).

At this time, when determining the CBGTI field 1470 and/or some information (1480, 1490) of NDI and RV information as an additional MCS, the terminal not only indicates that the MCS information indicates an MCS value, but also the MCS It may be determined that the information is an additional offset value for the MCS indicated in the MCS field of the DCI. For example, when MCS 12 is indicated in the MCS field of DCI, and a value according to the CBGTI field 1470 and/or some information (1480, 1490) of NDI and RV information means an offset value 4, the terminal It may be determined that the MCS value in at least one PUSCH among the PUSCHs is 14.

For example, when a DCI scheduling up to 8 PUSCHs schedules transmission of 4 PUSCHs (K=4), if all of the PUSCHs are initial transmission, the terminal is part of the CBGTI field 1470 and/or NDI information Information (information not used for the scheduling or 1445, 1446, 1447, 1448) and part of RV information (information not used for the scheduling or 1455, 1456, 1457, 1458) or all RV information (in case of initial transmission, the RV When always fixed to 0, 1451, 1452, 1453, 1454, 1455, 1456, 1457, 1458) may be determined to be additional MCS information or MCS offset information other than the MCS information included in the DCI.

Similarly, by using the CBGTI field 1470 and/or some information 1480, 1490 of NDI and RV information, the base station may indicate one or more HARQ process IDs to the terminal. For example, the terminal determines that some information of the CBGTI field 1470 and/or NDI and RV information is additional HARQ process ID information other than HARQ process ID information included in the DCI, and determines the HARQ process ID information to the At least one of the scheduled PUSCHs, for example, the second scheduled PUSCH (PUSCH#1) (in this case, the HARQ process ID of the first scheduled PUSCH (PUSCH#0) is according to the HARQ process ID value of the DCI. Determined) or the second scheduling PUSCH and subsequent PUSCHs (PUSCH#1, PUSCH#2, PUSCH#3), or the floor (K/2) or ceil (K/2)-th scheduled PUSCH and the PUSCH thereafter For the HARQ process ID value (in this case, a HARQ process ID sequentially from the HARQ process ID of the first PUSCH may be applied to the previous PUSCH).

In this case, when determining the CBGTI field 1470 and/or some information (1480, 1490) of NDI and RV information as an additional HARQ process ID, the terminal indicates that the HARQ process ID information indicates a HARQ process ID value. In addition, it may be determined that the HARQ process ID information is an additional offset value for the HARQ process ID indicated in the HARQ process ID field of DCI. For example, when HARQ process ID 5 is indicated in the HARQ process ID field of DCI, and a value according to some information (1480, 1490) of the CBGTI field 1470 and/or NDI and RV information means an offset value 4 , The UE may determine that the HARQ process ID value in at least one PUSCH of the PUSCH is 9. At this time, the maximum number of HARQ process IDs that can be set (Z) and the offset value through a modulo (modulo) operation with the HARQ process ID P (for example, P = MOD (P, Z)) The HARQ process ID of the PUSCH may be determined.

For example, when a DCI scheduling up to 8 PUSCHs schedules transmission of 4 PUSCHs (K=4), if all of the PUSCHs are initial transmission, the terminal is part of the CBGTI field 1470 and/or NDI information Information (information not used for the scheduling or 1445, 1446, 1447, 1448) and part of RV information (information not used for the scheduling or 1455, 1456, 1457, 1458) or all RV information (in case of initial transmission, the RV When always fixed to 0, 1451, 1452, 1453, 1454, 1455, 1456, 1457, 1458) may be determined to be HARQ process ID information or HARQ process ID offset information included in the DCI.

15 is a diagram illustrating an operation of a terminal implementing the present invention. According to FIG. 15, the terminal is configured to enable retransmission of data in CBG units from the base station (1500). The setting may be made of a higher signal, and the setting includes at least one of information for setting retransmission in units of CBG, the maximum number of code block groups that can be included in one TB, and size information of a CBGTI field of DCI. I can. In addition, although not shown, the UE can support the type of uplink channel access procedure that the UE can support through reporting capacity information to the base station, the uplink signal transmission start position within the symbol, the uplink signal transmission end position within the symbol, and one through one DCI. At least one or more of capacity information of whether or not a function capable of transmitting the above different transport blocks through one or more uplink data channel transmission or whether a code block-based transmission is possible may be transmitted to the base station. In addition, separately or together with step 1500, the terminal may receive the maximum number of HARQ processes that can be set from the base station, the maximum number of TBs that can be transmitted, and the like as a higher signal.

Thereafter, the terminal receives a DCI for scheduling uplink data transmission (or PUSCH) from the base station (1510). The format of the DCI may be, for example, the same as FIGS. 12 to 14 and related technologies, and the terminal checks the CBGTI information included in the DCI (1520). Confirmation of the CBGTI information may be performed according to methods 1 to 5 described in the present disclosure.

The UE applies the identified CBGTI information to a PUSCH requiring retransmission in a CBG unit to perform uplink data transmission or/and retransmission (1530). Specifically, the UE can check the retransmission PUSCH among PUSCHs scheduled by DCI through the NDI included in the DCI, confirm that retransmission in the CBG unit is applied to some or all of the PUSCHs, and the CBGTI unit It is confirmed that retransmission is indicated by CBGTI information according to Method A described in this disclosure for some CBGs of PUSCH on which retransmission is performed. The UE performs retransmission of CBG in which retransmission is indicated by CBGTI. In addition, the UE may also perform transmission of a PUSCH scheduled for initial transmission by the received DCI and retransmission of a PUSCH in which retransmission in units of TB is indicated.

Each of the above steps does not necessarily have to be sequentially performed, and specific steps may be omitted or the described order may be changed. In addition, the contents of FIG. 15 may be obviously applied to the PDSCH as well as the PUSCH.

16 is a diagram showing an operation of a base station performing the present invention. According to FIG. 16, although not shown, the base station transmits configuration information for setting data retransmission in units of CBG to the terminal. The configuration information may be transmitted as a higher signal, and the configuration information includes at least one of information for setting retransmission in units of CBG, the maximum number of code block groups that can be included in one TB, and size information of a CBGTI field of DCI. Information may be included. In addition, separately or together with the configuration information, the base station may transmit configuration information including the maximum number of HARQ processes that can be set to the terminal, the maximum number of TBs that can be transmitted, and the like, as a higher signal. In addition, although not shown, the base station can support one or more types of uplink channel access procedures supported by the terminal through reporting capacity information from the terminal, the uplink signal transmission start position within the symbol, the uplink signal transmission end position within the symbol, and one or more DCIs. At least one or more of capacity information of whether a function capable of transmitting different transport blocks through at least one uplink data channel transmission is supported and whether a code block-based transmission is possible may be received.

The base station receives uplink data from the terminal (1600). The base station may determine whether retransmission of the uplink data is required on a per CBG basis, and generates a DCI including CBGTI information indicating retransmission for the CBG determined to require retransmission (1610). The format of the DCI may be, for example, the same as FIGS. 12 to 14 and related technologies, and the base station may generate the DCI so that CBGTI information is confirmed by methods 1 to 5 described in the present disclosure.

The base station transmits the generated DCI to the terminal (1620). Thereafter, the base station receives the uplink data scheduled by the DCI (1630). The uplink data may include CBG data in which retransmission is indicated by CBGTI information, and in this case, CBG data in which retransmission is indicated may be confirmed by Method A described in the present disclosure. In addition, the uplink data may also include data for which initial transmission is scheduled by DCI and data for which retransmission in units of TB is indicated.

Each of the above steps does not necessarily have to be sequentially performed, and specific steps may be omitted or the described order may be changed. In addition, the contents of FIG. 15 may be obviously applied to the PDSCH as well as the PUSCH.

In the present disclosure, in order to determine whether a specific condition (or criteria) is fulfilled, the expressions above or below are used, but this is a description for expressing an example, and does not exclude descriptions of excess or less. . Conditions described as'greater than' may be replaced with'greater than', conditions described as'less than' may be replaced with'less than', and conditions described as'more and less' may be replaced with'greater than and less than'.

The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types of 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 of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a communication network composed of a combination thereof. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, that other modified examples based on the technical idea of the present disclosure may be implemented is obvious to those of ordinary skill in the technical field to which the present disclosure belongs. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, some of the methods proposed in the present disclosure may be combined with each other to operate a base station and a terminal. In addition, although the above embodiments have been presented based on 5G and NR systems, other systems such as LTE, LTE-A, and LTE-A-Pro systems may also have other modifications based on the technical idea of the embodiment.

Claims (20)

In the terminal method of a wireless communication system,
Receiving downlink control information (DCI) for scheduling transmission of one or more uplink data from a base station;
Checking bits constituting code block group transmission information (CBGTI) information included in the DCI;
Identifying a code block group (CBG) requiring retransmission among the one or more uplink data based on the identified CBGTI information; And
And transmitting uplink data corresponding to the code block group requiring retransmission to the base station. The method of claim 1,
The bit constituting the CBGTI information is at least one of a bit of a CBGTI field of the DCI, an unused bit of a new data indicator (NDI) field, and an unused bit of a redundancy version (RV) field. The method comprising a. The method of claim 1,
The method of claim 1, wherein the number of bits constituting the CBGTI information is set by higher layer signaling. The method of claim 2 or 3,
The step of checking the number of uplink data to which CBGTI information is applied among uplink data in which retransmission is indicated based on the number of bits constituting the CBGTI information,
The number of uplink data to which the CBGTI information is applied is equal to the number of uplink data in which retransmission is indicated, or the maximum number of CBGs that can be set per transport block, the number of CBGs of uplink data, and the CBGTI information. The method of claim 1, wherein the method is determined based on at least one of the number of bits to be used. The method of claim 4,
The CBGTI information based on at least one of the number of bits applied to each of the uplink data to which the CBGTI information is applied among the CBGTI information, the maximum number of CBGs that can be set per transport block, and the number of CBGs of the uplink data The method further comprising the step of checking a CBG in which retransmission is indicated among uplink data to which is applied. The method of claim 1,
Receiving configuration information for setting retransmission in units of CBG from the base station,
The configuration information includes at least one of information for setting retransmission in units of CBG, the number of maximum code block groups that can be included in one TB, and size information of a CBGTI field of DCI. In the method of a base station of a wireless communication system,
Receiving uplink data from a terminal;
Generates downlink control information (DCI) including code block group transmission information (CBGTI) information indicating a code block group requiring retransmission among the uplink data Step to do;
Transmitting the DCI to the terminal; And
And receiving retransmitted uplink data based on the DCI from the terminal. The method of claim 7,
The bit constituting the CBGTI information is at least one of a bit of a CBGTI field of the DCI, an unused bit of a new data indicator (NDI) field, and an unused bit of a redundancy version (RV) field. The method comprising a. The method of claim 7,
The method of claim 1, wherein the number of bits constituting the CBGTI information is set by higher layer signaling. The method of claim 7,
Further comprising the step of transmitting configuration information for setting retransmission in units of CBG to the terminal,
The configuration information includes at least one of information for setting retransmission in units of CBG, the number of maximum code block groups that can be included in one TB, and size information of a CBGTI field of DCI. In the terminal of the wireless communication system,
A transceiver; And
Receiving downlink control information (DCI) for scheduling transmission of one or more uplink data from a base station, and configuring code block group transmission information (CBGTI) information included in the DCI Check the bit, identify a code block group (CBG) requiring retransmission among the one or more uplink data based on the identified CBGTI information, and uplink data corresponding to the code block group requiring retransmission And a control unit connected to the transmitting/receiving unit for controlling transmission of the signal to the base station. The method of claim 11,
The bit constituting the CBGTI information is at least one of a bit of a CBGTI field of the DCI, an unused bit of a new data indicator (NDI) field, and an unused bit of a redundancy version (RV) field. Terminal comprising a. The method of claim 11,
The terminal, characterized in that the number of bits constituting the CBGTI information is set by higher layer signaling. The method of claim 12 or 13,
The control unit further controls to check the number of uplink data to which CBGTI information is applied among uplink data in which retransmission is indicated based on the number of bits constituting the CBGTI information,
The number of uplink data to which the CBGTI information is applied is equal to the number of uplink data in which retransmission is indicated, or the maximum number of CBGs that can be set per transport block, the number of CBGs of uplink data, and the CBGTI information. Terminal, characterized in that it is determined based on at least one of the number of bits. The method of claim 14,
The control unit is based on at least one of the number of bits applied to each of the uplink data to which the CBGTI information is applied among the CBGTI information, the maximum number of CBGs that can be set per the transport block, and the number of CBGs of the uplink data. And further controlling to check a CBG in which retransmission is indicated among uplink data to which the CBGTI information is applied. The method of claim 11,
The control unit further controls to receive setting information for setting retransmission in units of CBG from the base station,
The configuration information includes at least one of information for configuring retransmission in units of CBG, the number of maximum code block groups that can be included in one TB, and size information of a CBGTI field of DCI. In the base station of a wireless communication system,
A transceiver; And
Downlink control information including code block group transmission information (CBGTI) information indicating a code block group requiring retransmission among the uplink data and receiving uplink data from the terminal It comprises a control unit connected to the transceiver for generating (downlink control information, DCI), transmitting the DCI to the terminal, and controlling to receive the retransmitted uplink data from the terminal based on the DCI. Base station. The method of claim 7,
The bit constituting the CBGTI information is at least one of a bit of a CBGTI field of the DCI, an unused bit of a new data indicator (NDI) field, and an unused bit of a redundancy version (RV) field. Base station comprising a. The method of claim 17,
The base station, characterized in that the number of bits constituting the CBGTI information is set by higher layer signaling. The method of claim 17,
The control unit further controls to transmit configuration information for setting retransmission in units of CBG to the terminal,
The configuration information includes at least one of information for configuring retransmission in units of CBG, the number of maximum code block groups that can be included in one TB, and size information of a CBGTI field of DCI.

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