Method and apparatus for transmitting and receiving downlink control information in a wireless communication system

Abstract

A method and apparatus for transmitting and receiving downlink control information in a wireless communication system are provided. The method of a terminal includes receiving uplink configuration information from a base station, receiving downlink control information (DCI) including information related to activation of ungranted uplink transmission from the base station, identifying information related to activation of ungranted uplink transmission based on the uplink configuration information, and transmitting an uplink signal to the base station based on the identification result.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving downlink control information in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, considerable efforts have been made to develop improved fifth generation (5G) communication systems or pre-5G communication systems. For this reason, 5G communication systems or pre-5G communication systems are referred to as super 4G network communication systems or post-long term evolution (LTE) systems. In order to achieve high data rates, 5G communication systems are being considered for implementation in millimeter wave (mmWave) bands (e.g., 60 GHz bands). In order to reduce the propagation path loss of radio waves in the millimeter wave bands and increase the propagation distance of radio waves, technologies such as beamforming, massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna systems are being discussed for 5G communication systems. In addition, in order to improve the system network for 5G communication systems, technologies such as evolved small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multipoint (CoMP), and receive interference cancellation are being developed. In addition, for 5G communication systems, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0003] The Internet has evolved from a human-centric connected network, through which humans generate and consume information, to an Internet of Things (IoT) network, where information is exchanged and processed between distributed elements such as objects. The Internet of Everything (IoE) is emerging, combining IoT-related technologies with technologies for processing big data, such as through connections to cloud servers. Implementing the IoT requires various technical components, such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. In recent years, research has been conducted on technologies including sensor networks for connecting objects, machine-to-machine (M2M) communication, and machine-type communication (MTC). In the IoT environment, intelligent Internet technology (IT) services can be provided to collect and interpret data obtained from connected objects, creating new value in human life. As existing information technologies and various industries merge and combine, the IoT can be applied to a variety of fields, such as smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart appliances, and high-quality medical services.

[0004] Various attempts are underway to apply 5G communication systems to IoT networks. For example, 5G communication technologies, including beamforming, MIMO, and array antennas, are being used to implement technologies related to sensor networks, machine-to-machine communication, and machine-to-communication (MTC). Cloud RAN, as an application of these big data processing technologies, exemplifies the convergence of 5G communication and IoT technologies.

[0005] As various services may be provided according to the development of wireless communication systems, a method of efficiently providing these services is required.

[0006] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0007] Technical Solutions

[0008] Aspects of the present disclosure are to address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below. Accordingly, one aspect of the present disclosure is to provide a method and apparatus for transmitting and receiving downlink control information in a wireless communication system.

[0009] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0011] Figure 1 is a diagram illustrating an uplink / downlink time-frequency domain transmission structure of a New Radio (NR) system according to an embodiment of the present disclosure;

[0012] Figure 2 is a diagram illustrating a channel access procedure in an unlicensed spectrum according to an embodiment of the present disclosure;

[0013] Figure 3 is a diagram illustrating a downlink or uplink scheduling method and resource regions in an NR system according to an embodiment of the present disclosure;

[0014] Figure 4 is a diagram illustrating an example of configuration of a control resource set for a downlink control channel in an NR system according to an embodiment of the present disclosure;

[0015] Figure 5 is a diagram illustrating a structure of a downlink control channel in an NR system according to an embodiment of the present disclosure;

[0016] Figure 6 is a diagram illustrating an example of transmitting an uplink signal without uplink scheduling information in an NR system according to an embodiment of the present disclosure;

[0017] Figure 7 is a diagram illustrating an example of a method of identifying a field of downlink control information (DCI) when multiple physical uplink shared channels (PUSCHs) are used for scheduling according to an embodiment of the present disclosure;

[0018] Figure 8 is a flowchart of the operation of a base station according to an embodiment of the present disclosure;

[0019] Figure 9 is a flowchart of the operation of a terminal according to an embodiment of the present disclosure;

[0020] Figure 10 is a flow chart of operations of a base station for identifying activation of ungranted uplink transmission according to an embodiment of the present disclosure;

[0021] Figure 11 is a flowchart of operations of a terminal for identifying activation of ungranted uplink transmission according to an embodiment of the present disclosure;

[0022] Figure 12 is a block diagram showing the structure of a base station according to an embodiment of the present disclosure; and

[0023] Figure 13 is a block diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.

[0024] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0025] According to an aspect of the present disclosure, a method for operating a terminal in a wireless communication system is provided.

[0026] The operating method includes: receiving uplink configuration information from a base station; receiving downlink control information (DCI) including information related to activation of unlicensed uplink transmission from the base station; identifying information related to activation of unlicensed uplink transmission based on the uplink configuration information; and sending an uplink signal to the base station based on the identification result.

[0027] According to another aspect of the present disclosure, a method for operating a base station in a wireless communication system is provided. The method includes: transmitting uplink configuration information to a terminal; transmitting downlink control information including information related to activation of unlicensed uplink transmission to the terminal; and receiving an uplink signal from the terminal based on a result of identifying the information related to activation of the unlicensed uplink transmission, wherein the information related to activation of the unlicensed uplink transmission is identified based on the uplink configuration information.

[0028] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes: a transceiver; and at least one processor configured to receive uplink configuration information from a base station, receive downlink control information including information related to activation of unlicensed uplink transmission from the base station, identify information related to activation of unlicensed uplink transmission based on the uplink configuration information, and transmit an uplink signal to the base station based on the identification result.

[0029] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0030] The following description, with reference to the accompanying drawings, is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these are to be regarded as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. Furthermore, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0031] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0032] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0033] The effects and features of the present disclosure and the methods for realizing them will be explained with reference to the embodiments described in detail below with reference to the accompanying drawings. In this regard, the embodiments of the present disclosure may have different forms and should not be construed as being limited to the description set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and the concept of the embodiments of the present disclosure will be fully conveyed to those of ordinary skill in the art. Throughout the specification, the same reference numerals refer to the same elements.

[0034] It will be understood that the individual blocks of the flowchart and the combination of the flowcharts can be executed by computer program instructions. Because these computer program instructions can be embedded in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, the instructions executed by the processor of the computer or other programmable data processing device generate modules for performing the functions described in the (multiple) flowchart blocks. Because these computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to implement the functions in a specific manner, the instructions stored in the computer-usable or computer-readable memory can also produce an article of manufacture containing instruction modules for performing the functions described in the (multiple) flowchart blocks. Because the computer program instructions can also be installed on a computer or other programmable data processing device, the instructions for executing the computer or other programmable data processing device by performing a series of operations on the computer or other programmable data processing device to generate a computer-implemented process can provide operations for performing the functions described in the (multiple) flowchart blocks.

[0035] In addition, each block may represent a module, segment or portion of code that includes one or more executable instructions for performing (a plurality of) specified logical functions. It should also be noted that in some alternative embodiments, the functions described in the blocks may not occur in the order shown in the accompanying drawings. For example, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order, depending on the functions involved herein.

[0036] The term "module" or "device / machine" used herein refers to a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the "module" or "device / machine" performs certain functions. However, the term "module" or "device / machine" is not limited to software or hardware. The term "module" or "device / machine" can be configured in an addressable storage medium, or can be configured to reproduce one or more processors. Therefore, for example, the term "module" includes elements, such as software elements, object-oriented software elements, class elements and task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided in an element and a "module" or "device / machine" can be combined with fewer elements and "modules" or "device / machines", or can be separated from additional elements and "modules" or "device / machines". In addition, an element and a "module" or "device / machine" can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. Furthermore, in the embodiments of the present disclosure, a “module” or a “machine” may include one or more processors.

[0037] Throughout the disclosure, the expression "at least one of a, b, or c" refers to only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0038] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0039] In this disclosure, a controller may also be referred to as a processor.

[0040] Throughout the specification, a layer (or layer arrangement) may also be referred to as an entity.

[0041] When describing the present disclosure, when a detailed description of a related known function or configuration is determined to unnecessarily obscure the main points of the present disclosure, the detailed description thereof may be omitted. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] As used herein, for the convenience of description, terms used to identify access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are exemplified. Therefore, the present disclosure is not limited to the terms described later, and other terms referring to objects having equivalent technical meanings may be used.

[0043] For ease of description, this document uses the terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited by the terms and names and can be equally applied to systems that comply with other standards. Specifically, the present disclosure can be applied to 3GPP New Radio (NR), a fifth-generation (5G) mobile communication standard. For ease of description, the term evolved Node B ("eNB") used in this disclosure can be used interchangeably with the term next-generation Node B ("gNB"). That is, a base station described as an eNB can represent a gNB. In addition, the term "terminal" can refer not only to mobile phones, NB-Internet of Things (IoT) devices, and sensors, but also to other wireless communication devices.

[0044] Hereinafter, a base station is configured to allocate resources to a terminal and may include at least one of a gNB, an eNB, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. Examples of terminals may include UEs, MSs, cellular phones, smartphones, computers, multimedia systems capable of performing communication functions, and the like. The present disclosure is not limited to the above examples.

[0045] Compared to the existing 4G system, in the 5G system, support for various services is being considered. For example, the most representative services may include enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), and evolved multimedia broadcast / multicast service (eMBMS). A system for providing URLLC services may be referred to as a URLLC system, and a system for providing eMBB services may be referred to as an eMBB system. In addition, the term "service" and the term "system" may be used interchangeably.

[0046] In a communication system, a plurality of services can be provided to users. In order to provide a plurality of services to users, a method for providing each service in the same time interval according to the characteristics of the service and an apparatus using the method are required.

[0047] In a wireless communication system (e.g., an LTE or LTE-Advanced (LTE-A) system or a 5G NR system), a base station may transmit a downlink signal to a terminal via a physical downlink control channel (PDCCH). In this case, the downlink signal transmitted to the terminal via the PDCCH may include downlink control information (DCI), which includes resource allocation information for transmitting the downlink signal. The base station may transmit the DCI including the downlink resource allocation information to the terminal, and thus the terminal may be configured to receive at least one downlink signal selected from a downlink reference signal (e.g., a channel state information reference signal (CSI-RS)), a broadcast channel (e.g., a physical broadcast channel (PBCH)), and a downlink data channel (e.g., a physical downlink shared channel (PDSCH)).

[0048] For example, the base station may send DCI to the terminal in subframe n, where the DCI indicates, through the PDCCH, that the PDSCH is to be received in subframe n. The terminal having received the DCI may receive the PDSCH in subframe n based on the received DCI.

[0049] In addition, in LTE, LTE-A, or NR systems, the base station can send DCI including uplink resource allocation information to the terminal through the PDCCH. The base station can send DCI including uplink resource allocation information to the terminal, so the terminal can be configured to send at least one uplink signal selected from an uplink reference signal (e.g., a sounding reference signal (SRS)), uplink control information (UCI), a physical random access channel (PRACH), and an uplink data channel (e.g., a physical uplink shared channel (PUSCH)) to the base station.

[0050] For example, a terminal that has received uplink transmission configuration information (or uplink DCI, UL authorization, etc.) sent from a base station via PDCCH in subframe n can perform uplink data channel transmission (hereinafter referred to as PUSCH transmission) based on a predefined time (e.g., n+4) or a time set by a higher-layer signal (e.g., n+k) or uplink signal transmission time indicator information (e.g., n+k) included in the uplink transmission configuration information.

[0051] When a configured downlink signal is transmitted from a base station to a terminal through an unlicensed spectrum, or when a configured uplink signal is transmitted from a terminal to a base station through an unlicensed spectrum, a transmitting device (base station or terminal) may perform a channel access procedure (or listen before talk (LBT)) for the unlicensed spectrum in which signal transmission is configured before or immediately before a set signal transmission start time point. When it is determined based on the result of performing the channel access procedure that the unlicensed spectrum is in an idle state, the transmitting device (base station or terminal) may perform the configured signal transmission by accessing the unlicensed spectrum. Alternatively, when it is determined based on the channel access procedure performed by the transmitting device that the unlicensed spectrum is not in an idle state or is in an occupied state, the transmitting device cannot access the unlicensed spectrum, and therefore the transmitting device may not transmit the configured signal. Generally, the channel access procedure in an unlicensed spectrum in which signal transmission is configured is as follows.

[0052] For example, a transmitting device may receive a signal in an unlicensed spectrum within a certain time or a time calculated according to a predefined rule (e.g., a time calculated by at least one random value selected by a base station or a terminal). The transmitting device may determine the idle state of the unlicensed spectrum by comparing the strength of the received signal with a threshold value that is predefined or calculated by a function, wherein the function is constructed by at least one variable among the channel bandwidth or signal bandwidth through which the signal to be transmitted is transmitted, the strength of the transmission power, and the beamwidth of the transmitted signal. For example, when the signal strength received by the transmitting device within 25 μs is less than a predefined threshold of -72 dBm, the transmitting device may determine that the unlicensed spectrum is in an idle state and may perform the configured signal transmission. At this time, the maximum possible time of signal transmission may be limited according to the maximum channel occupancy time defined for each country or region in the unlicensed spectrum or the type of transmitting device (e.g., base station or terminal, or master device or slave device).

[0053] For example, in Japan, in the 5-GHz unlicensed spectrum, a base station or terminal can occupy a channel and transmit signals after the channel access procedure without performing an additional channel access procedure for up to 4ms. When the received signal strength within 25μs is greater than a predefined threshold of -72dBm, the base station can determine that the unlicensed spectrum is not idle and may not transmit a signal.

[0054] In 5G communication systems, various technologies have been introduced, such as technologies capable of transmitting uplink signals without retransmitting code block group (CBG) units or uplink scheduling information, in order to provide various services and support high data rates. Therefore, when performing 5G communication through unlicensed spectrum, a more efficient channel access process that takes various variables into consideration is required.

[0055] Wireless communication systems have evolved from systems that provide voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services based on communication standards such as 3GPP's High Speed Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-A, 3GPP2's High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and IEEE 802.16e. Furthermore, standards for 5G or NR are being established as 5G wireless communication systems.

[0056] In a wireless communication system including 5G, at least one service selected from eMBB, mMTC, and URLLC may be provided to a terminal. The above services may be provided to the same terminal during the same time interval. In an embodiment of the present disclosure, eMBB may be a service for high-speed transmission of high-capacity data, mMTC may be a service for minimizing terminal power and accessing multiple terminals, and URLLC may be a service for high reliability and low latency, but the present disclosure is not limited thereto. The above three services may be the main scenarios in an LTE system or a post-LTE system (such as a 5G / NR system).

[0057] In the case where the base station schedules data corresponding to the eMBB service to a certain terminal in a specific transmission time interval (TTI), when the situation occurs where URLLC data must be sent in the TTI, the base station does not send a portion of the eMBB data in the frequency band where the eMBB data has been scheduled and sent, and can send the generated URLLC data in the frequency band where the eMBB data is scheduled and sent. The terminal scheduled by the eMBB and the terminal scheduled by the URLLC can be the same terminal or different terminals. In this case, because a portion of the eMBB data that has been scheduled and sent is not sent, the possibility that the eMBB data will be damaged may increase. Therefore, in the above case, it is necessary to determine a signal reception method and a signal processing method for processing signals received from the terminal scheduled by the eMBB or the terminal scheduled by the URLLC.

[0058] In the present disclosure, downlink (DL) may refer to a radio transmission path for a signal sent from a base station to a terminal, and uplink (UL) may refer to a radio transmission path for a signal sent from a terminal to a base station. In addition, as an embodiment of the present disclosure, an LTE or LTE-A system will be described as an example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Examples thereof may include 5G mobile communication technologies (e.g., 5G, NR, etc.) developed after LTE-A.

[0059] In the NR system, which is a representative example of a broadband wireless communication system, an orthogonal frequency division multiplexing (OFDM) scheme is adopted in the downlink, and both OFDM and single-carrier frequency division multiple access (SC-FDMA) schemes are adopted in the uplink. The uplink may refer to a radio link through which a terminal (or UE, MS, etc.) transmits data or a control signal to a base station (or eNB, BS, etc.), and the downlink may refer to a radio link through which a base station transmits data or a control signal to a terminal. According to the multiple access scheme as described above, data or control information can generally be allocated and operated so that the time-frequency resources carrying data or control information for each user do not overlap with each other, that is, orthogonality is established, so that the data or control information of each user can be identified.

[0060] The NR system adopts a hybrid automatic repeat request (HARQ) scheme, in which when a decoding failure occurs in the initial transmission, the corresponding data is retransmitted in the physical layer. In the HARQ scheme, when the receiver fails to correctly decode the data, the receiver sends information (negative acknowledgment (NACK)) to notify the transmitter of the decoding failure, so that the transmitter retransmits the corresponding data in the physical layer. The receiver can improve data reception performance by combining the data retransmitted by the transmitter with the data that was previously failed to decode. In addition, when the receiver correctly decodes the data, information (acknowledgment (ACK)) notifying the transmitter of the decoding success can be sent to the transmitter, so that the transmitter can send new data.

[0061] Figure 1 This figure illustrates the uplink / downlink time-frequency domain transmission structure of an NR system according to an embodiment of the present disclosure. The time-frequency domain refers to the radio resource region through which data or control channels are transmitted in the uplink and / or downlink.

[0062] refer to Figure 1 , the horizontal axis may represent the time domain, and the vertical axis may represent the frequency domain. The minimum transmission unit in the time domain is an OFDM or DFT-s-OFDM symbol, and N symb OFDM or DFT-s-OFDM symbols 101 may be aggregated to form a time slot 102. OFDM symbols may refer to symbols when signals are transmitted and received using an OFDM multiplexing scheme, and DFT-s-OFDM symbols may refer to symbols when signals are transmitted and received using a DFT-s-OFDM or SC-FDMA multiplexing scheme. In this disclosure, for ease of description, OFDM symbols will be used in common without distinguishing between OFDM symbols and DFT-s-OFDM symbols. The following description will be given based on the transmission and reception of downlink signals, but can also be applied to the transmission and reception of uplink signals.

[0063] When the subcarrier spacing (SCS) is 15kHz, one time slot can be aggregated to constitute one subframe 103, and the length of the time slot and the subframe can be 1ms respectively. In this case, the number of time slots constituting one subframe 103 and the length of the time slot can be changed according to the subcarrier spacing. For example, when the subcarrier spacing is 30kHz, four time slots can be aggregated to constitute one subframe 103. In this case, the length of the time slot can be 0.5ms and the length of the subframe can be 1ms. The radio frame 104 can refer to a time domain interval including 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the entire system transmission bandwidth can include NBW subcarriers 105. However, these specific values can be applied variably. For example, in the LTE system, the subcarrier spacing is 15kHz, and two time slots are aggregated to constitute one subframe 103. In this case, the length of the time slot is 0.5ms, and the length of the subframe is 1ms.

[0064] The basic unit of resources in the time-frequency domain is a resource element (RE) 106, which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) 107 or a physical resource block (PRB) can be defined as N in the time domain. symb consecutive OFDM symbols 101 and N in the frequency domain SC RB Continuous subcarriers 108. Therefore, one RB 107 in one time slot may include N symb ×N SC RB RE. Usually, the minimum allocation unit of data in the frequency domain is RB 107. In the NR system, usually N symb =14, N SC RB =12, and the number of RBs N RB It can be changed according to the system transmission bandwidth. In LTE system, usually N symb =7, N SC RB =12, and N RB Can be changed according to the system transmission bandwidth.

[0065] DCI can be sent within the first N OFDM symbols in a subframe. Typically, N = {1, 2, 3}, and the terminal can be configured with the number of symbols through which DCI can be sent from the base station via a higher-layer signal. Alternatively, the base station can set the number of symbols through which DCI can be sent in a time slot differently for each time slot according to the amount of control information to be sent in the current time slot. The base station can send information about the number of symbols to the terminal via a separate downlink control channel.

[0066] In the NR or LTE system, scheduling information for downlink data or uplink data can be sent from the base station to the terminal through DCI. DCI is defined according to several formats, and can indicate whether the DCI is scheduling information (UL authorization) for uplink data or scheduling information (DL authorization) for downlink data, whether the DCI is a compact DCI with smaller control information, whether the control information is a fallback DCI, whether multiple antennas are used to apply spatial multiplexing, and whether the DCI is a power control DCI according to each format. For example, a DCI format (e.g., DCI format 1_0 of NR) that is scheduling information (DL authorization) for downlink data can include at least one of the following control information.

[0067] - Control information identifier (DCI format identifier): an identifier that identifies the received DCI format.

[0068] - Frequency Domain Resource Allocation (FDRA): indicates the RBs allocated for data transmission.

[0069] - Time Domain Resource Allocation (TDRA): Indicates the time slots and symbols allocated for data transmission.

[0070] Virtual RB (VRB) to PRB mapping: Indicates whether VRB mapping is applied

[0071] - Modulation and Coding Scheme (MCS): indicates a modulation scheme used for data transmission and the size of a transport block as data to be sent.

[0072] - New data indicator: indicates whether it is HARQ initial transmission or retransmission.

[0073] - Redundancy version: indicates the redundancy version of HARQ.

[0074] -HARQ process number: indicates the HARQ process number.

[0075] -PDSCH allocation information (downlink allocation index): indicates to the terminal the number of PDSCH reception results (eg, the number of HARQ-ACKs) to be reported to the base station.

[0076] - Transmit Power Control (TPC) Command of Physical Uplink Control Channel (PUCCH): Indicates the TPC command of PUCCH which is an uplink control channel.

[0077] -PUCCH resource indicator: indicates a PUCCH resource used for HARQ-ACK reporting including a reception result of a PDSCH configured by corresponding DCI.

[0078] - PUCCH transmission timing indicator (PDSCH-to-HARQ_feedback timing indicator): indicates information about a time slot or symbol in which a PUCCH is transmitted for an HARQ-ACK report including a reception result of a PDSCH configured by corresponding DCI.

[0079] According to an embodiment of the present disclosure, DCI may be transmitted on a PDCCH (or control information, hereinafter used interchangeably) or an enhanced PDCCH (EPDCCH) (or enhanced control information, hereinafter used interchangeably) through a channel coding and modulation process.

[0080] Typically, DCI can be scrambled independently for each terminal using a specific radio network temporary identifier (RNTI) (or terminal identifier C-RNTI) to add a cyclic redundancy check (CRC), and can be channel-coded, configured as an independent PDCCH, and then transmitted. In the time domain, the PDCCH can be mapped and transmitted during the control channel transmission interval. The frequency domain mapping position of the PDCCH can be determined by the identifier (ID) of each terminal and can be transmitted while being extended across the entire system transmission bandwidth.

[0081] According to an embodiment of the present disclosure, downlink data can be transmitted on the PDSCH, which is a physical channel for transmitting downlink data. The PDSCH can be transmitted after the control channel transmission interval, and scheduling information such as a specific mapping position in the frequency domain and a modulation scheme can be determined based on the DCI transmitted through the PDCCH. The base station can notify the terminal of the modulation scheme applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block (TB) size (TBS)) through the MCS among the multiple control information constituting the DCI. According to an embodiment of the present disclosure, the MCS may include 5 bits, or more or less bits. TBS may refer to the size before channel coding for error correction is applied to the data (TB) to be transmitted by the base station.

[0082] The modulation schemes supported by the NR system include quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, and 256QAM, and the modulation order (Qm) thereof is 2, 4, and 6. That is, in the case of QPSK modulation, 2 bits per symbol can be transmitted; in the case of 16QAM modulation, 4 bits per symbol can be transmitted; in the case of 64QAM modulation, 6 bits per symbol can be transmitted; and in the case of 256QAM modulation, 8 bits per symbol can be transmitted. In addition, a modulation scheme of 256QAM or higher can be used according to system modification.

[0083] In the NR system, uplink / downlink HARQ adopts an asynchronous HARQ scheme, in which the data retransmission time point is not fixed. For example, in the case of the downlink, when HARQ NACK is fed back from the terminal to the base station regarding the initial transmission data sent by the base station, the base station can freely determine the retransmission data transmission time point through scheduling operations. The terminal can buffer the data determined to be erroneous as a result of decoding the received data for HARQ operation, and then perform combination with the data retransmitted from the base station. The HARQ ACK / NACK information of the PDSCH sent in subframe nk can be sent from the terminal to the base station via PUCCH or PUSCH in subframe n. In a 5G communication system such as NR, the k value can be included in the DCI indicating or scheduling the reception of the PDSCH sent in subframe nk and sent, or can be set to the terminal through a higher-layer signal. In this case, the base station can set one or more k values as a higher-layer signal, and a specific k value can be indicated through the DCI. In this case, k can be determined based on the HARQ-ACK processing capability of the terminal (ie, the minimum time required for the terminal to receive PDSCH and generate and report HARQ-ACK for PDSCH). In addition, the terminal can use a predefined value or a default value until the k value is set.

[0084] Although the wireless communication system, method, and apparatus described in the embodiments of the present disclosure have been described based on the NR system, the content of the present disclosure is not limited to the NR system, but can be applied to various wireless communication systems such as LTE, LTE-A, LTE-A-Pro, and 5G. In addition, although the present disclosure has been described based on a system and apparatus for transmitting and receiving signals using an unlicensed spectrum, the content of the present disclosure can be applied to a system operating in a licensed spectrum.

[0085] Hereinafter, in the present disclosure, high-layer signaling or high-layer signal may refer to a method of transmitting a signal from a base station to a terminal using a downlink data channel of a physical layer, or a method of transmitting a signal from a terminal to a base station by using an uplink data channel of a physical layer. High-layer signaling or high-layer signal may include a method of transmitting a signal transmitted through a medium access control (MAC) control element (MAC CE), a radio resource control (RRC) signaling, or a packet data convergence protocol (PDCP) signaling. In addition, system information (e.g., a system information block (SIB)) transmitted to multiple terminals in common may be included in the high-layer signaling or high-layer signal.

[0086] In the case where the system performs communication in an unlicensed spectrum, a transmitting device (base station or terminal) intending to transmit a signal through the unlicensed spectrum may perform a channel access procedure (or LBT) for the unlicensed spectrum on which communication is to be performed before transmitting the signal, and when it is determined according to the channel access procedure that the unlicensed spectrum is in an idle state, the transmitting device may perform signal transmission by accessing the unlicensed spectrum. When it is determined according to the channel access procedure that the unlicensed spectrum is not in an idle state, the transmitting device may not perform signal transmission.

[0087] Generally, a channel access process in an unlicensed spectrum may refer to a process of measuring the signal strength received by a transmitting device through an unlicensed spectrum within a fixed time or a time calculated according to a predefined rule (for example, a time calculated by at least a random value selected by a base station or terminal), and determining the idle state of the unlicensed spectrum by comparing the signal strength with a threshold value predefined or calculated by a function, and determining the received signal strength, wherein the function is constructed by at least one variable among the channel bandwidth or signal bandwidth through which the signal to be transmitted is transmitted and the strength of the transmission power.

[0088] For example, the transmitting device may measure the signal strength within Xμs (e.g., 25μs) immediately before the time when the signal is to be transmitted, and may determine that the unlicensed spectrum is in an idle state when the measured signal strength is less than a predefined or calculated threshold value T (e.g., -72dBm), and transmit the set signal. In this case, after the channel access process, the maximum time of continuous signal transmission may be limited according to the maximum channel occupancy time defined for each country, region, and frequency band for each unlicensed spectrum, and the maximum time of continuous signal transmission may also be limited according to the type of transmitting device (e.g., a base station or a terminal, or a master device or a slave device). For example, in Japan, in the 5-GHz unlicensed spectrum, with respect to the unlicensed spectrum determined to be in an idle state after the channel access process, the base station or the terminal may occupy the channel and transmit a signal without performing an additional channel access process for up to 4ms.

[0089] More specifically, when a base station or a terminal intends to transmit a downlink or uplink signal in an unlicensed spectrum, a channel access procedure that can be performed by the base station or the terminal can be classified into the following types.

[0090] - Type 1: Uplink / downlink signal transmission after performing a channel access procedure within a variable time

[0091] - Type 2: Uplink / downlink signal transmission after performing a channel access procedure within a fixed time

[0092] - Type 3: Transmission of downlink or uplink signals without performing a channel access procedure

[0093] Hereinafter, in the present disclosure, the case where the base station sends a downlink signal to the terminal through the unlicensed spectrum and the case where the terminal sends an uplink signal to the base station through the unlicensed spectrum are described in a mixed manner, but the contents described in the present disclosure can be applied in the same manner or in a partially modified manner to the case where the terminal sends an uplink signal to the base station through the unlicensed spectrum or the case where the base station sends a downlink signal to the terminal through the unlicensed spectrum. Therefore, a detailed description of downlink signal transmission and reception will be omitted. In addition, in the present disclosure, the following description will be given based on the assumption that one piece of downlink data information (codeword or TB) or uplink data information is sent and received between the base station and the terminal. However, the contents described in the present disclosure can also be applied to the case where the base station sends a downlink signal to multiple terminals or the case where multiple codewords or TBs are sent and received between the base station and the terminal.

[0094] According to an embodiment of the present disclosure, a transmitting node (hereinafter referred to as a base station or a terminal) that intends to transmit a signal in an unlicensed spectrum may determine a channel access procedure scheme according to the type of signal to be transmitted. For example, when the base station intends to transmit a downlink signal including a downlink data channel in an unlicensed spectrum, the base station may perform a channel access procedure of a type 1 scheme. When the base station intends to transmit a downlink signal that does not include a downlink data channel in an unlicensed spectrum, for example, when the base station intends to transmit a synchronization signal or a downlink control channel, the base station may perform a channel access procedure of a type 2 scheme and transmit a downlink signal.

[0095] In this case, the channel access procedure scheme can be determined according to the transmission length of the signal to be sent in the unlicensed spectrum or the length of the time or interval used by occupying the unlicensed spectrum. Generally, the channel access procedure of the type 1 scheme may have to be performed for a longer time than the channel access procedure of the type 2 scheme. Therefore, when a signal is to be sent within a short time interval or a time less than or equal to a reference time (for example, X ms or Y symbols), the channel access procedure of the type 2 scheme can be performed. When a signal is to be sent within a long time interval or a time greater than or equal to a reference time (for example, X ms or Y symbols), the channel access procedure of the type 1 scheme can be performed. That is, the channel access procedures of different schemes can be performed according to the usage time of the unlicensed spectrum.

[0096] When the channel access procedure of the Type 1 scheme is performed according to at least one of the above criteria, a channel access priority level (CAPC) may be determined based on a quality of service level identifier (QCI) of a signal to be transmitted in an unlicensed spectrum. With respect to the determined CAPC, the channel access procedure may be performed using at least one predefined setting value as shown in Table 1 below. For example, QCI 1, QCI 2, and QCI 4 may refer to QCI values for services such as conversational voice, conversational video (live stream), and non-conversational video (buffered stream), respectively. When it is intended to transmit a signal for a service that does not match the QCI of Table 1 to an unlicensed spectrum, a method of selecting the QCI closest to Table 1 and the QCI of the service and selecting the corresponding CAPC may be used.

[0097] Table 1 below shows the mapping relationship between CAPC and QCI.

[0098]

Table 1

[0099] Channel access priority QCI 1 1，3，5，65，66，69，70 2 2，7 3 4，6，8，9 4 -

[0100] For example, according to the determined CAPC (hereinafter, also referred to as p), the minimum value of the contention window (CW min，p ) and maximum value (CW max，p ), maximum channel occupancy time (T mcot，p ) etc. and a set of contention window values or sizes (CW p ) can be determined from Table 2 below. That is, a base station that intends to send a downlink signal in an unlicensed spectrum can f +m p *T sl When the channel access procedure is intended to be performed with CAPC 3 (p=3), m p =3 to set the delay duration T required to perform the channel access process f +m p *T sl When unlicensed spectrum is determined to be p *T s1 When the channel is in an idle state, N=N-1. In this case, N can be selected as 0 and the value of the contention window CW when performing the channel access process p In the case of CAPC 3, the minimum and maximum values of the contention window may be 15 and 63, respectively. When the unlicensed spectrum is determined to be idle for the extension duration and the additional channel access procedure duration, the base station may mcot，pThe signal is transmitted over the unlicensed spectrum within 8 ms. Table 2 shows the CAPC in the downlink. For ease of description, the present disclosure will be described using the downlink CAPC. However, in the case of the uplink, the CAPC of Table 2 can be reused, or a CAPC for uplink transmission can be defined and used.

[0101]

Table 2

[0102]

[0103] The base station can use a table to configure the channel access process performance information required for the uplink transmission of the terminal through high-layer signaling (e.g., SIB, MIB, MAC-CE, or RRC signaling). Each column of the table may include at least one of the channel access type, CAPC, cyclic prefix (CP) extension value for uplink (or downlink) OFDM symbol transmission, or timing advance (TA) value. For example, when the base station instructs the terminal to perform uplink transmission in DCI format 0_0, the base station can indicate the channel access process and the information required for uplink transmission to the terminal by indicating the column corresponding to Table 3 below using the 2-bit "ChannelAccess-CPext" field included in the corresponding DCI format.

[0104]

Table 3

[0105] Bit fields mapped to indices Channel access type CP expansion 0 Type 3 C2*symbol length-16us-TA 1 Type 2 C3*Symbol Length-25us-TA 2 Type 2 C1*symbol length-25us 3 Type 1 0

[0106] When the base station instructs the terminal to perform uplink transmission in DCI format 0_1, the base station may use the 'ChannelAccess-CPext' field included in the corresponding DCI format and Table 4 to indicate the channel access procedure and information required for uplink transmission to the terminal.

[0107]

Table 4

[0108]

[0109]

[0110] The base station may configure at least one entry in the column of Table 4 to the terminal through high-layer signaling, and the terminal may receive an indication of one of the at least one entries in Table 4 configured by the base station as the "ChannelAccess-CPext" field from the base station. In this case, the size of the "ChannelAccess-CPext" field may be determined as Wherein, I may refer to the number of entries configured by the base station through higher layer signaling.

[0111] According to an embodiment of the present disclosure, the initial contention window value (CW p) can refer to the minimum value of the contention window (CW min，p ). The base station that selects the value of N can sl The channel access process is performed during the duration of T sl When the channel access process performed during the duration determines that the unlicensed spectrum is idle, the base station can change the value to N=N-1. When N=0, the base station can use the unlicensed spectrum to mcot，p Send signal within T sl When the unlicensed spectrum determined through the channel access process is not in an idle state within the duration, the base station may perform the channel access process again without changing the N value.

[0112] According to an embodiment of the present disclosure, the contention window value CW p The CW range may be changed based on the time when the base station starts the channel access process, the time when the base station selects the N value to perform the channel access process, or the reception result of the downlink data channel in the reference subframe or reference time slot in the downlink signal transmission interval (or maximum channel occupancy time (MCOT)) most recently transmitted by the base station through the unlicensed spectrum immediately before the time. In other words, the base station may receive a report from the terminal on the reception result of the downlink data transmitted in the reference subframe or reference time slot, and may increase or minimize the CW range according to the proportion Z of NACKs in the reported reception result. p The amplitude.

[0113] Figure 2 is a diagram illustrating a channel access procedure in an unlicensed spectrum according to an embodiment of the present disclosure.

[0114] refer to Figure 2The channel access procedure start time 270 at which the base station starts the channel access procedure, the time at which the base station selects the N value 222 to perform the channel access procedure, or the first transmission interval (hereinafter, time slot 240 or subframe 240) of the downlink signal transmission interval (MCOT) 230 most recently transmitted through the unlicensed spectrum immediately before the time may be a reference time slot (in this case, the channel access procedure start time 270) for changing the contention window of the channel access procedure. In the downlink signal transmission interval (MCOT) 230, the PDCCH 260 and the PDSCH 262 may be transmitted. When the base station cannot receive a report of the reception result of the downlink data channel transmitted in the first time slot 240 of the transmission interval 230, for example, when the time interval between the first subframe and the channel access procedure start time 270 of the base station is less than n time slots or subframes, that is, when the base station starts the channel access procedure before the time when the terminal can report the reception result of the downlink data channel of the first subframe 240, the first subframe of the most recent downlink signal transmission interval transmitted before the downlink signal transmission interval 230 may be the reference subframe. In other words, when the reception result of the downlink data transmitted in the reference subframe 240 is not received from the terminal at the channel access procedure start time 270 of the base station, the time when the base station selects the N value to perform the channel access procedure, or immediately before that time, the base station may determine the first subframe of the most recently transmitted downlink signal transmission interval among the reception results of the downlink data channel previously received from the terminal as the reference subframe. The base station may determine the size of the contention window used in the channel access procedure (in this case, the channel access procedure start time 270 ) using the downlink data reception result received from the terminal regarding the downlink data transmitted through the downlink data channel in the reference subframe.

[0115] For example, when 80% or more of the reception results of the terminal for downlink data transmitted to the terminal through the downlink data channel in the first subframe among the downlink signals transmitted through the unlicensed spectrum are determined as NACK by the terminal, the downlink data channel is accessed through the channel access procedure configured by CAPC 3 (p=3) (e.g., CW p =15) The base station sending the downlink signal can change the contention window from the initial value (CW p =15) is increased to the value of the next contention window (CW p =31).

[0116] When 80% or more of the terminal's reception results are not determined as NACKs, the base station may maintain the existing value of the contention window or change it to its initial value. In this case, the change in the contention window may be applied to all types of CAPCs or only to the type of CAPC used during the channel access process. In this case, a method for determining the reception result effective when determining the change in the contention window size, among the reception results of downlink data transmitted or reported by the terminal to the base station regarding downlink data transmitted via a downlink data channel, in the reference subframe or reference time slot used to determine the change in the contention window size, is as follows, i.e., a method for determining the Z value.

[0117] When the base station sends one or more codewords or TBs to one or more terminals in a reference subframe or reference time slot, the base station may determine the Z value based on the proportion of NACKs among the reception results sent or reported by the terminal regarding the TBs received in the reference subframe or reference time slot. For example, when two codewords or two TBs are sent to one terminal in a reference subframe or reference time slot, the base station may receive or be reported the reception results of downlink data signals for the two TBs from the terminal. When the proportion Z of NACKs among the two reception results is equal to or greater than a predefined threshold (e.g., Z=80%) set between the base station and the terminal, the base station may change or increase the size of the contention window.

[0118] In this case, when the terminal bundles the reception results of downlink data on one or more subframes (e.g., M subframes) including the reference subframe or time slot and transmits or reports the bundled reception results to the base station, the base station can determine that the terminal has transmitted the M reception results. The base station can determine the Z value based on the ratio of NACKs among the M reception results and can change, maintain, or initialize the size of the contention window.

[0119] When the reference subframe is the reception result of the second time slot between two time slots constituting a subframe, the Z value can be determined based on the proportion of NACKs among the reception results sent or reported by the terminal to the base station regarding the downlink data received in the reference subframe (i.e., the second time slot) and the subsequent subframes.

[0120] In addition, when scheduling information or downlink control information of a downlink data channel sent by a base station is sent in the same cell or frequency band as the cell or frequency band through which the downlink data channel is sent, when scheduling information or downlink control information of a downlink data channel sent by a base station is sent through an unlicensed spectrum but in a cell different from the cell through which the downlink data channel is sent or at a different frequency, when it is determined that the terminal has not yet sent the reception result of the downlink data received in the reference subframe or reference time slot, and when it is determined to be any state among discontinuous transmission (DTX), NACK / DTX, or the reception result of the downlink data sent by the terminal, the base station can determine the reception result of the terminal as NACK and determine the Z value.

[0121] In addition, when the scheduling information or downlink control information of the downlink data channel transmitted by the base station is transmitted through the licensed spectrum, and when the reception result of the downlink data transmitted by the terminal is determined to be DTX, NACK / DTX, or any state, the base station may not include the reception result of the terminal in the reference value Z of the contention window change. In other words, the base station may ignore the reception result of the terminal and determine the Z value.

[0122] In addition, when the base station sends scheduling information or downlink control information of the downlink data channel through the licensed spectrum, and when the base station does not actually send downlink data among the reception results of the downlink data regarding the reference subframe or reference time slot sent or reported to the base station by the terminal (no transmission), the base station can ignore the reception results sent or reported by the terminal regarding the downlink data and determine the Z value.

[0123] In the embodiments of the present disclosure, Figure 2 An example of may include a busy channel 200. The base station may start the channel access procedure at a channel access procedure start time 202. Also, the base station may start the channel access procedure at a T f +m p *T sl During interval 212, a channel access procedure is performed for the unlicensed spectrum. f +m p *T sl The interval 212 can be determined by T f Time 210 and T sl Time 220 configuration.

[0124] In 5G systems, considering various services and requirements, the frame structure needs to be defined and operated in a flexible manner. For example, each service can have a different subcarrier spacing depending on the requirements. Current 5G communication systems support multiple subcarrier spacings, and the subcarrier spacing can be determined using the following equation 1.

[0125] <Equation 1>

[0126] Δf=f02 m

[0127] f0 can represent the basic subcarrier spacing (SCS) of the system, and m can represent an integer scaling factor. For example, when f0 is 15kHz, the subcarrier spacing set available for the 5G communication system can be configured as 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz, etc. The available subcarrier spacing set can be different depending on the frequency band. For example, 3.75kHz, 7.5kHz, 15kHz, 30kHz and 60kHz can be used for frequency bands of 6GHz or lower, and 60kHz, 120kHz and 240kHz can be used for frequency bands of 6GHz or higher.

[0128] The length of an OFDM symbol can vary depending on the subcarrier spacing that makes up the OFDM symbol. This is because the subcarrier spacing and the length of an OFDM symbol have an inverse relationship due to the characteristics of the OFDM symbol. For example, when the subcarrier spacing is doubled, the symbol length is reduced to 1 / 2. Conversely, when the subcarrier spacing is reduced to 1 / 2, the symbol length can be doubled. Figure 3 Describes a resource region through which data channels are transmitted in a 5G communication system.

[0129] Figure 3 2 is a diagram illustrating a downlink or uplink scheduling method and resource areas in an NR system according to an embodiment of the present disclosure.

[0130] refer to Figure 3 , the terminal can monitor or search for PDCCH 310 in a downlink control channel (hereinafter referred to as PDCCH) region (hereinafter referred to as control resource set (CORESET) or search space (SS)) configured from the base station through a higher layer signal. In this case, the downlink control channel region may include information in the time domain (or resource) 314 and the frequency domain (or resource) 312. The information in the time domain 314 may be set in units of symbols, and the information in the frequency domain 312 may be set in units of RBs or RB groups. When the terminal detects PDCCH 310 in time slot (index) i 300, the terminal may obtain DCI transmitted by the detected PDCCH 310. Through the received DCI, the terminal may obtain scheduling information for a downlink data channel or an uplink data channel. In other words, the DCI may include resource region (or PDSCH transmission region) information, where at least the terminal must receive the downlink data channel (hereinafter referred to as PDSCH) sent from the base station, or include resource region information allocated from the base station to the terminal for sending an uplink data channel (PUSCH).

[0131] For example, the case where a terminal is scheduled to transmit an uplink data channel (PUSCH) is as follows. A terminal that has received DCI can obtain the time slot index or offset information K for receiving the PUSCH through the DCI and determine the PUSCH transmission time slot index. For example, based on the time slot index i 300 received by the PDCCH 310, the terminal can determine that the PUSCH is scheduled to be transmitted in time slot i+K 305 through the received offset information K. In this case, the terminal can determine the PUSCH start symbol or time in time slot i+K 305 or time slot i+K through the received offset information K based on the CORESET of the received PDCCH 310. In addition, the terminal can obtain information about the PDSCH / PUSCH transmission time-frequency resource field 340 in the PUSCH transmission time slot i+K 305 from the DCI. In this case, the PUSCH transmission frequency resource field information 330 can be PRB or PRB group unit information. The PUSCH transmission frequency resource domain information 330 may refer to a domain included in the initial uplink bandwidth (BW) or initial uplink bandwidth part (BWP) determined by the terminal or configured for the terminal through the initial access procedure. When the terminal is configured with an uplink BW or uplink BWP through a higher-layer signal, the PUSCH transmission frequency resource domain information 330 may refer to a domain included in the uplink BW or uplink BWP configured through the higher-layer signal. BW 335 may refer to a bandwidth corresponding to time slot i 300 and time slot i+K.

[0132] The PUSCH transmission time resource region information 325 may be symbol or symbol group unit information, or information indicating absolute time information. In this case, the PUSCH transmission time resource region information 325 may be expressed as a combination of the PUSCH transmission start time or symbol, the length of the PUSCH, or the PUSCH end time or symbol, and may be included in the DCI as a field or value. In this case, the PUSCH transmission time resource region information 325 may be included in the DCI as a field or value indicating the PUSCH transmission start time or symbol, the length of the PUSCH, or the PUSCH end time or symbol, respectively. The terminal may transmit the PUSCH in the PUSCH transmission resource region 340 determined by the above-mentioned DCI.

[0133] Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the accompanying drawings.

[0134] Figure 4 is a diagram showing an example of the configuration of a control resource set of a downlink control channel in an NR system according to an embodiment of the present disclosure. That is, Figure 4is a diagram illustrating an example of a control region set (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0135] refer to Figure 4 , UE BWP 410 may be configured on the frequency axis, and two control resource sets (control resource set #1 401 and control resource set #2 402) may be configured in one time slot 420 on the time axis. Control resource set #1 401 and control resource set #2 402 may be configured to specific frequency resources 403 within the entire UE BWP 410 on the frequency axis. One or more OFDM symbols may be configured on the time axis and may be defined as a control resource set duration 404. Figure 4 In the example of FIG. 4 , control resource set #1 401 is configured with a control resource set duration of two symbols, and control resource set #2 402 is configured with a control resource set duration of one symbol.

[0136] The base station can configure the control resource set of the 5G wireless communication system to the UE through higher-layer signaling (e.g., system information (SI), master information block (MIB), and radio resource control (RRC) signaling). Configuring the control resource set to the terminal may mean providing information such as a control resource set identifier, a frequency location of the control resource set, and a symbol duration of the control resource set. For example, information related to the control resource set may include the information shown in Table 5 below.

[0137]

Table 5

[0138]

[0139] In Table 5, the tci-StatesPDCCH (abbreviated as transmission configuration indication (TCI) state) configuration information may include information about one or more synchronization signal (SS) / physical broadcast channel (PBCH) block indices, where the index has a quasi-co-located (QCLed) relationship with the demodulation reference signal (DMRS) or channel state information reference signal (CSI-RS) index transmitted in the corresponding control resource set. The frequencyDomainResources configuration information can configure the frequency resources of the CORESET as a bitmap. Each bit can refer to a group of six PRBs that do not overlap with each other. The first group can refer to a group with A group of six PRBs as the first PRB index, where It can refer to the starting point of the BWP. The most significant bit of the bitmap can indicate the first group and can be configured in ascending order.

[0140] Figure 5is a diagram showing the structure of a downlink control channel in an NR system according to an embodiment of the present disclosure. That is, Figure 5 is a diagram illustrating an example of basic units of time and frequency resources constituting a downlink control channel that can be used in a 5G communication system.

[0141] refer to Figure 5 The basic unit of time and frequency resources that constitute the control channel can be called a resource element group (REG) 503. REG 503 can be defined as one OFDM symbol 501 on the time axis and one physical resource block (PRB) 502 on the frequency axis (i.e., 12 subcarriers). By cascading REGs 503, a downlink control channel allocation unit can be configured.

[0142] like Figure 5 As shown in FIG, when the basic unit to which the downlink control channel is allocated in the 5G communication system is a control channel element (CCE) 504, one CCE 504 may include multiple REGs 503. Figure 5 In the example shown in FIG, when REG 503 includes 12 REs and one CCE 504 includes 6 REGs 503, one CCE 504 may include 72 REs. According to an embodiment of the present disclosure, when a downlink control resource set is configured, the downlink control resource set may include multiple CCEs 504. A specific downlink control channel may be transmitted after being mapped to one or more CCEs 504 according to an aggregation level (AL) in the control resource set. The CCEs 504 in the control resource set may be identified by numbers. In this case, numbers may be assigned to the CCEs 504 according to a logical mapping scheme.

[0143] Figure 5 The basic unit of the downlink control channel shown in FIG, ie, REG 503, may include an RE to which DCI is mapped and an area to which DMRS 505, a reference signal for decoding DCI, is mapped. Figure 5 As shown, three DMRSs 505 may be transmitted in one REG 503 .

[0144] Depending on the AL, the number of CCEs required to send the PDCCH can be 1, 2, 4, 8 or 16, and different numbers of CCEs can be used to implement link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel can be sent via L CCEs. The terminal must detect the signal without knowing information about the downlink control channel. A search space representing a set of CCEs can be used to help such blind decoding. A search space may refer to a set of downlink control channel candidates, including the CCEs that the terminal must attempt to decode on a given AL. Because there are various ALs that bundle 1, 2, 4, 8 and 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all set ALs.

[0145] The search space can be classified into a common search space and a UE-specific search space. A certain group of terminals or all terminals can search the common search space of the PDCCH in order to receive common control information, such as paging messages or dynamic scheduling of system information. For example, a terminal can receive PDSCH scheduling allocation information for the transmission of SIBs including cell operator information, etc. by searching the common search space of the PDCCH. The common search space can be defined as a set of previously agreed CCEs, because a certain group of terminals or all terminals must receive the PDCCH. The terminal can receive UE-specific PDSCH or PUSCH scheduling allocation information by monitoring the UE-specific search space of the PDCCH. The UE-specific search space can be a function of the terminal identity and various system parameters, and can be defined in a UE-specific manner.

[0146] In a 5G communication system, the parameters of the PDCCH search space can be set from the base station to the terminal through high-layer signaling (e.g., SIB, MIB, MAC-CE, or RRC signaling). For example, the base station can set the number of PDCCH candidates at each ALL, the monitoring period of the search space, the monitoring timing of the symbol unit in the time slot of the search space, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI format monitored in the search space, the control resource set index used to monitor the search space, etc. For example, the parameters of the search space may include the information shown in Table 6 below.

[0147]

Table 6

[0148]

[0149] The base station may configure one or more search space sets to the terminal according to the configuration information described in Table 6. For example, the base station may configure search space set #1 and search space set #2 to the terminal, may configure DCI format A scrambled by X-RNTI in search space set #1 to be monitored in the common search space, and may configure DCI format B scrambled by Y-RNTI in search space set #2 to be monitored in the UE-specific search space.

[0150] One or more search space sets may exist in a common search space or a UE-specific search space according to the configuration information described in Table 6. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0151] The following combinations of DCI formats and RNTIs may be monitored in the common search space.

[0152] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0153] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0154] DCI format 2_1 with CRC scrambled by INT-RNTI

[0155] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0156] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0157] The following combinations of DCI formats and RNTIs may be monitored in the UE-specific search space.

[0158] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0159] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0160] The RNTI specified above may follow the following definition and usage.

[0161] C-RNTI (cell RNTI): used for UE-specific PDSCH scheduling

[0162] TC-RNTI (Temporary Cell RNTI): used for UE-specific PDSCH scheduling

[0163] CS-RNTI (Configuration Scheduling RNTI): used for semi-statically configured UE-specific PDSCH scheduling

[0164] RA-RNTI (Random Access RNTI): used for PDSCH scheduling in the random access phase

[0165] P-RNTI (Paging RNTI): used for PDSCH scheduling to send paging

[0166] SI-RNTI (System Information RNTI): used for PDSCH scheduling to send system information

[0167] INT-RNTI (interrupt RNTI): used to notify whether PDSCH is punctured

[0168] TPC-PUSCH-RNTI (PUSCH Transmit Power Control RNTI): used to indicate the power control command of PUSCH

[0169] TPC-PUCCH-RNTI (PUCCH Transmit Power Control RNTI): used to indicate the power control command of PUCCH

[0170] TPC-SRS-RNTI (SRS Transmit Power Control RNTI): used to indicate the power control command of SRS

[0171] Hereinafter, a method for allocating frequency domain resources to a data channel in a 5G communication system will be described.

[0172] In the 5G communication system, three types can be supported as a method of indicating frequency domain resource allocation information of the downlink data channel (PDSCH) and the uplink data channel (PUSCH). For example, these three types may include resource allocation type 0, resource allocation type 1, and resource allocation type 2.

[0173] Resource Allocation Type 0

[0174] -RB allocation information can be notified from the base station to the terminal in the form of a bitmap of resource block groups (RBGs). In this case, an RBG can include a set of consecutive VRBs, and the size P of the RBG can be determined based on the value set as the higher-layer parameter (rbg-Size) and the BWP size value defined in Table 7 below.

[0175]

Table 7

[0176] Bandwidth portion size Configuration 1 Configuration 2 1-36 2 4 37-72 4 8 73-144 8 16 145-275 16 16

[0177] Size The total number of RBGs of BWPi is N RBG can be defined as follows.

[0178] > in

[0179] >>The size of the first RBG is

[0180] >>If Then the size of the last RBG is Otherwise, P

[0181] >>All other RBGs have size P.

[0182] -At this time, the size is N RBG Each bit of the bitmap can correspond to each RBG. The RBGs can be indexed in order of increasing frequency starting from the lowest frequency position of the BWP. For N in BWP RBG RBG, RBG#0 to RBG#(N RBG -1) can be mapped from the most significant bit (MSB) to the least significant bit (LSB) of the RBG bitmap. When a specific bit value in the bitmap is 1, the terminal can determine that the RBG corresponding to the bit value is allocated, and when the specific bit value in the bitmap is 0, the terminal can determine that the RBG corresponding to the bit value is not allocated.

[0183] Resource Allocation Type 1

[0184] -RB allocation information may be notified from the base station to the terminal as information on the starting position and length of consecutively allocated VRBs. In this case, interleaving or non-interleaving may be additionally applied to consecutively allocated VRBs. The resource allocation field of resource allocation type 1 may include a resource indication value (RIV), and the RIV may include the starting point (RB) of the VRB. start ) and the length of the consecutively allocated RBs (L RBs ). More specifically, the size is The RIV of BWP can be defined as follows.

[0185] >If So

[0186] >>

[0187] Otherwise

[0188] >>

[0189] > where L RBs ≥1 and should not exceed

[0190] Resource Allocation Type 2

[0191] -RB allocation information may be notified from the base station to the terminal as a set of M interlace indices.

[0192] - Interlace index m∈{0, 1, ..., M-1} may include common RBs, RBs{m, M+m, 2M+m, 3M+m, ...}, and M may be defined as shown in Table 8.

[0193]

Table 8

[0194] μ M 0 10 1 5

[0195] Common RBs in interlace m and bandwidth part i and RB The relationship between can be defined as follows.

[0196] >

[0197] in is the common resource block, where the bandwidth part starts relative to the common resource block 0. μ is the subcarrier spacing index.

[0198] - When the subcarrier spacing is 15 kHz (μ = 0), the RB allocation information of the interleaving set can be notified from the base station to the terminal through m0+1 indices. In addition, the resource allocation field can include RIV. When RIV is 0≤RIV<M(M+1) / 2, where 1=0, 1, ...L-1, the number of interleavings after the starting interleaving m0 can be L (L≥1), and the value is as follows.

[0199] if So

[0200] RIV=M(L-1)+m0

[0201] otherwise

[0202] RIV=M(M-L+1)+(M-1-m0)

[0203] When RIV is RIV≥M(M+1) / 2, RIV may include a starting interleaving index m0 and a 1 value, and may be configured as shown in Table 9.

[0204]

Table 9

[0205] RIV-M(M+1) / 2 m0 l 0 0 {0，5} 1 0 {0，1，5，6} 2 1 {0，5} 3 1 {0，1，2，3，5，6，7，8} 4 2 {0，5} 5 2 {0，1，2，5，6，7} 6 3 {0，5} 7 4 {0，5}

[0206] When the subcarrier spacing is 30 kHz (μ = 1), the base station may notify the terminal of RB allocation information in the form of a bitmap indicating the interlaces allocated to the terminal. The size of the bitmap is M, and one bit of the bitmap corresponds to an interlace. The order of the interlace bitmap may be mapped from MSB to LSB, that is, from interlace index 0 to interlace index M-1.

[0207] In a 5G system, a base station can schedule multiple PUSCH transmissions to a terminal in one DCI (e.g., DCI format 1_0). In this case, the base station can use a table to configure the time domain resource allocation information of the uplink data channel (PUSCH) through high-layer signaling (e.g., RRC signaling). Each column of the table can indicate the offset value of the transmission of the first PUSCH among multiple PUSCHs, and the time resource allocation information of up to eight PUSCHs (e.g., start and length indicator value (SLIV) and mapping type). The maximum number of PUSCHs to be scheduled is the number of PUSCHs included in the table configured with the high-layer configuration, and the base station can notify the terminal of the maximum number of PUSCHs. When the base station instructs the terminal to send multiple PUSCHs, the base station can assign only the HARQ process number of the first PUSCH to the terminal, and the terminal can determine that the HARQ process number of the second PUSCH increases by 1 in ascending order from the HARQ process number of the first PUSCH. Alternatively, when the base station passes the maximum HARQ process number to the terminal, the terminal can determine the HARQ process number by modulo operation. In addition, in this case, the size of the New Data Indicator (NDI) field included in the DCI can be expanded from 1 bit to the maximum number of PUSCH transmissions configured by the base station to the terminal (up to 8 bits), and each bit can be used as the NDI for each PUSCH. In addition, the size of the Redundancy Version (RV) Indicator field included in the DCI can be expanded to the maximum number of PUSCH transmissions configured by the base station to the terminal (up to 8 bits). In this case, each 1 bit can be used as the RV indicator for each PUSCH, and each 1 bit can represent a value of 0, 2, or 3.

[0208] In the NR communication system, in order to provide various services and support high data rates, an uplink signal (Configuration Grant PUSCH (CG-PUSCH)) may be transmitted without uplink scheduling information. In this case, the method of transmitting an uplink signal without uplink scheduling information may be referred to as a grant-free uplink signal (e.g., PUSCH) transmission method.

[0209] More specifically, when an uplink signal is intended to be sent without uplink scheduling information, information such as resource allocation and MCS for uplink transmission can be configured through RRC signaling or DCI of PDCCH, and uplink transmission that can be performed by the terminal can be described based on at least the following types according to the uplink transmission configuration receiving method.

[0210] - Type 1: Uplink transmission configuration using RRC signaling

[0211] - Type 2: Uplink transmission configuration using the downlink control channel of the physical layer

[0212] In type 1, the base station can configure specific time / frequency resources that allow unauthorized PUSCH (e.g., CG-PUSCH) transmission to the terminal through high-layer signaling (e.g., RRC signaling). In addition, the base station can configure various parameters for PUSCH transmission (e.g., frequency hopping, DMRS configuration, MCS table, MCS, RBG size, repeat transmission count, RV, etc.) to the terminal through high-layer signaling. When the configuration information for type 1 PUSCH transmission is received from the base station, the terminal can periodically send PUSCH on the configured resources without the authorization of the base station. The various parameters required to send PUSCH (e.g., frequency hopping, DMRS configuration, MCS, RBG size, repeat transmission count, RV, number of precoding layers, antenna port, frequency hopping offset, etc.) can follow the setting values notified by the base station.

[0213] In type 2, the base station may configure some information (e.g., time period information) among the information about specific time / frequency resources allowing ungranted PUSCH (e.g., CG-PUSCH) transmission to the terminal through higher-layer signaling (e.g., RRC signaling). In addition, the base station may configure various parameters for PUSCH transmission (e.g., frequency hopping, DMRS configuration, MCS table, MCS, RBG size, repeated transmission count, RV, etc.) to the terminal through higher-layer signaling.

[0214] According to an embodiment of the present disclosure, the base station may send a DCI (verification DCI) configured with a specific DCI field for the purpose of activating or releasing type 2 CG-PUSCH scheduling to the terminal. More specifically, the base station may configure the CS-RNTI to the terminal, and the terminal may monitor a DCI format in which the CRC is scrambled by the CS-RNTI. When the CRC of the DCI format received by the terminal is scrambled by the CS-RNTI and the value of the NDI included in the DCI is 0, the terminal may verify that the DCI is a DCI for activating or releasing type 2 CG-PUSCH scheduling (verification DCI).

[0215] When verification of Type 2 CG-PUSCH transmission is completed, the terminal can determine whether Type 2 CG-PUSCH transmission is activated or released based on the specific field value of the DCI. For example, when the specific field has the value shown in Table 10 below according to the DCI format, the terminal can determine that Type 2 CG-PUSCH is activated. For another example, when the specific field has the value shown in Table 11 below according to the DCI format, the terminal can determine that Type 2 CG-PUSCH is released.

[0216]

Table 10

[0217]

[0218]

Table 11

[0219] DCI format 0_0 DCI format 1_0 HARQ process number Set to all "0" Set to all "0" Redundant version Set to "00" Set to "00" Modulation and coding schemes Set to all "1" Set to all "1" Frequency domain resource allocation Set to all "1" Set to all "1"

[0220] That is, referring to Table 10, for DCI format 0_0 or 0_1, when the HARQ process number value is all "0" and the RV value is "00", the terminal can determine that Type 2 CG-PUSCH transmission is activated. In addition, for DCI format 1_0, when the HARQ process number value is all "0" and the RV value is "00", the terminal can determine that Type 2 CG-PUSCH transmission is activated. In addition, for DCI format 1_0, when the HARQ process number value is all "0" and the RV value is "00" for an enabled transport block, the terminal can determine that Type 2 CG-PUSCH transmission is activated.

[0221] In addition, referring to Table 11, for DCI format 0_0, when the HARQ process number value is all "0", the RV value is "00", the MCS value is all "1", and the FDRA value is all "1", the terminal can determine that the type 2 CG-PUSCH transmission is released. In addition, for DCI format 1_0, when the HARQ process number value is all "0", the RV value is "00", the MCS value is all "1", and the FDRA value is all "1", the terminal can determine that the type 2 CG-PUSCH transmission is released.

[0222] Figure 6 is a diagram illustrating an example of transmitting an uplink signal without uplink scheduling information in an NR system according to an embodiment of the present disclosure. That is, Figure 6 is a diagram illustrating a case where an uplink signal is transmitted in an unlicensed spectrum without uplink scheduling information.

[0223] refer to Figure 6, time slot i 601, time slot i+1 602, time slot i+2 603, and time slot i+3 604 may be included in a maximum channel occupancy time (MCOT) 612 of the terminal. PUCCH 605 and PUSCH 606 may be scheduled for transmission on time resource 613 of time slot i 601. Furthermore, PUSCH 607 may be scheduled for transmission on time resource 614 of time slot i+1 602. Furthermore, PUSCH 608 may be scheduled for transmission on time resource 615 of time slot i+2 603. Furthermore, PDCCH 609 may be scheduled for transmission on time resource 617 of time slot i+3 604. Time resources 613, 614, 615, and 617 may each correspond to frequency resources 620.

[0224] In an unlicensed spectrum, a channel access procedure may be performed to transmit an uplink signal without uplink scheduling information. In this case, when a terminal accesses the unlicensed spectrum by performing a channel access procedure within a variable time, the terminal may schedule downlink transmission in the last time slot or last subframe (e.g., time slot i+3 604) within the MCOT 612 based on the channel occupancy time sharing indicator of the uplink control information (e.g., PUCCH 605). In this case, the base station may determine channel access by performing a channel access procedure within a fixed time. The terminal may configure the last symbol of the time slot or subframe (e.g., time slot i+2 603) used for uplink transmission as the gap interval vacated by the channel access procedure for the base station. When transmitting a CG-PUSCH in an unlicensed spectrum, the terminal may transmit CG uplink control information (UCI) including the HARQ ID, RV, and CG-PUSCH scheduling information of the CG-PUSCH in a state included in the CG-PUSCH. In this case, all CG-PUSCHs may include at least one CG-UCI.

[0225] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving DCI in the wireless communication system. More particularly, the present disclosure relates to a wireless communication system, and more particularly, to a method for determining and analyzing control information included in DCI in a system and node for transmitting uplink signals via an unlicensed spectrum, or a system and node for receiving downlink signals via an unlicensed spectrum.

[0226] The present disclosure also relates to a method and apparatus for transmitting and receiving a downlink control channel in a wireless communication system. In an embodiment of the present disclosure, a method for determining DCI included in a downlink control channel in a system and node for transmitting an uplink signal via an unlicensed spectrum, or a system and node for receiving a downlink signal via an unlicensed spectrum, is provided.

[0227] According to an embodiment of the present disclosure, by a method for determining control information included in a downlink control channel in a system and node for receiving a downlink signal or a system and node for sending an uplink signal in a wireless communication system, uplink data transmission efficiency can be improved.

[0228] The present disclosure describes a method for receiving DCI in a base station, performed by a terminal, the terminal being configured to receive or transmit a downlink signal or an uplink signal in an unlicensed spectrum. More specifically, the terminal may determine activation or deactivation of CG-PUSCH transmission based on information configured from the base station via L1 or higher-layer signaling (e.g., SIB, MIB, MAC-CE, or RRC signaling).

[0229] The methods and apparatus described in the embodiments of the present disclosure are not applied to each embodiment on a limited basis, but can be used in methods and apparatus for sending or controlling uplink control information using all or a combination of one or more embodiments of the present disclosure described herein. In addition, in the embodiments of the present disclosure, a case where a terminal receives a configuration of PUSCH transmission or PDSCH reception from a base station through a high-layer signal configuration without DCI reception and performs PUSCH transmission or PDSCH reception as in semi-persistent scheduling (SPS) or configuration authorization transmission will be described as an example, but the present disclosure can also be applied to a case where a terminal is scheduled to receive PDSCH or transmit PUSCH from a base station through DCI. In addition, the present disclosure can also be applied to a case where uplink control information is sent in a broadband system such as a subband-based broadband unlicensed spectrum, multi-carrier or carrier aggregation transmission. In addition, the embodiments of the present disclosure will be described based on the assumption that the base station and the terminal operate in an unlicensed spectrum, but the methods and apparatus described in the embodiments of the present disclosure can be applied to base stations and terminals operating in a licensed spectrum, a shared spectrum or a side link.

[0230] Example 1

[0231] Embodiments of the present disclosure describe a method, performed by a terminal, for determining control information included in a downlink control channel when there are a base station and a terminal operating in an unlicensed spectrum. More specifically, Embodiment 1 of the present disclosure describes a method and apparatus for determining activation or release of a Type 2 CG-PUSCH using a specific field among multiple pieces of control information included in a control channel received by a terminal from a base station.

[0232] According to an embodiment of the present disclosure, when there are base stations and terminals that send and receive signals in an unlicensed spectrum, it can be assumed that the terminal is configured to perform PUCCH / PUSCH transmission in at least one time slot with a configuration authorization. In addition, the terminal can be instructed or configured with an uplink (or downlink) frequency domain resource allocation (or frequency domain resource allocation type 2) method based on staggering from the base station through L1 or high-layer signaling (e.g., SIB, MIB, MAC-CE, or RRC signaling). In addition, the terminal can be instructed or configured with a subcarrier spacing for uplink (or downlink) transmission from the base station through L1 or high-layer signaling. The base station can send a DCI (e.g., verification DCI) to the terminal in which a specific DCI field is configured with a specific value for the purpose of activating or releasing the above-mentioned type 2 CG-PUSCH scheduling. In this case, the DCI may include DCI format 0_0, DCI format 0_1, and DCI format 0_2. When the specific DCI field included in the received DCI indicates a specific value, the terminal can determine that type 2 CG-PUSCH scheduling is activated or released. Hereinafter, when the terminal according to Embodiment 1 of the present disclosure receives DCI including a specific field from the base station, a method of determining and interpreting the DCI will be described in detail.

[0233] Method 1

[0234] According to an embodiment of the present disclosure, for the purpose of activating or releasing type 2CG-PUSCH scheduling, the base station may configure a specific DCI field and send DCI to the terminal. In this case, the base station may include the FDRA field as a specific DCI field in the DCI to be sent to the terminal. The base station may configure (control or change) the FDRA field value for activation or release of type 2CG-PUSCH scheduling based on the subcarrier spacing information and the uplink (or downlink) frequency resource allocation method configured to the terminal through L1 or higher layer signaling. The terminal may determine whether the FDRA field value of the received DCI indicates activation or release of type 2CG-PUSCH scheduling based on the subcarrier spacing information and the uplink (or downlink) frequency resource allocation method indicated or configured from the base station through L1 or higher layer signaling.

[0235] For example, when the terminal is configured with 15kHz (μ=0) as the subcarrier spacing and the interleaving method (or FDRA type 2) as the frequency resource allocation method for CG-PUSCH transmission from the base station (or when the terminal is configured with the RIV-based RB allocation indication method), when the terminal interprets the information field related to FDRA among the specific fields of the received DCI to determine the scheduling release of type 2 CG-PUSCH, or when all (or some) information fields related to FDRA are set to 1 (or 0), the terminal can determine that the information field related to FDRA means the release of type 2 CG-PUSCH scheduling. In an embodiment of the present disclosure, the information field related to FDRA can be referred to as a frequency allocation information field.

[0236] For example, when the terminal is configured with 30 kHz (μ=1) as the subcarrier spacing and the interleaving method (or FDRA type 2) as the frequency resource allocation method for CG-PUSCH transmission from the base station (or when the terminal is configured with a bitmap-based RB allocation indication method), when the terminal interprets the information field related to FDRA among the specific fields of the received DCI to determine the scheduling release of type 2 CG-PUSCH, or when all (or some) information fields related to FDRA are set to 0 (or 1), the terminal can determine that the information field related to FDRA means the release of type 2 CG-PUSCH scheduling.

[0237] The above method is not limited to the subcarrier spacing information configured by the terminal from the base station, and can be extended to the RB allocation indication method. For example, when the subcarrier spacing is X kHz (for example, X = 60, 120, 240, 480, 960) and the RB allocation indication method of FDRA type 2 is based on a bitmap, when all (or some) information fields related to FDRA are set to 0 (or 1), the terminal can determine that the information field related to FDRA means the release of type 2 CG-PUSCH scheduling. For example, when the RB allocation indication method of FDRA type 2 is based on RIV, when all (or some) information fields related to FDRA are set to 1 (or 0), the terminal can determine that the information field related to FDRA means the release of type 2 CG-PUSCH scheduling.

[0238] Using the above-mentioned method 1, the terminal can determine whether the FDRA field value of the received DCI indicates activation or release of type 2 CG-PUSCH scheduling based on the subcarrier spacing information and uplink (or downlink) frequency resource allocation method indicated or configured from the base station through L1 or higher layer signaling. That is, based on the frequency resource allocation method, subcarrier spacing information, etc., even when the FDRA field value of the received DCI is the same, the terminal can also determine the activation or release of type 2 CG-PUSCH scheduling differently.

[0239] Method 2

[0240] According to an embodiment of the present disclosure, when a specific DCI format (e.g., DCI format 1_0) is used for activation or release of type 2CG-PUSCH scheduling, when interpreting the frequency allocation information field among the specific fields of the DCI, the terminal can determine that only some bits of the frequency allocation information field are used to determine the activation or release of type 2CG-PUSCH scheduling.

[0241] For example, the frequency allocation information field includes X+Y bits. The X bit may refer to the interleaving index of the allocated type 2 FDRA (e.g., based on a bitmap or RIV), and the Y bit may refer to the RB region activated within a specific frequency domain (e.g., BWP). In this case, the terminal may determine whether to release the type 2 CG-PUSCH based on the X bit. Alternatively, the terminal may determine whether to release the type 2 CG-PUSCH based on the Y bit. In this case, the values of X and Y may be set to a value indicating the interleaving index of the allocated type 2 FDRA and a value indicating the RB region activated within a specific frequency domain.

[0242] Method 3

[0243] According to an embodiment of the present disclosure, when the frequency allocation information field of the received DCI is used for activation or release of type 2CG-PUSCH scheduling, and there are unused bits or reserved bits in the frequency allocation information field value, when the corresponding bit or the index indicating the corresponding value is received, the terminal can determine that the scheduling of type 2CG-PUSCH is activated or released.

[0244] For example, when the terminal is configured with staggered frequency domain allocation (or FDRA type 2) from the base station through L1 or high-layer signaling and 15kHz (μ=1) is set (or RIV-based RB allocation indication method) as the subcarrier spacing, when the frequency allocation information field of the received DCI is used for scheduling release of type 2CG-PUSCH, the terminal can determine that the scheduling of type 2CG-PUSCH is released when receiving a field in the RIV field that is set to an unused or reserved bit.

[0245] Example 2

[0246] Embodiments of the present disclosure describe a method, performed by a terminal, for determining control information included in a downlink control channel when there are a base station and a terminal operating in an unlicensed spectrum. More specifically, Embodiment 2 of the present disclosure describes a method and apparatus for determining activation or release of a Type 2 CG-PUSCH using a specific field among multiple pieces of control information included in a control channel received by a terminal from a base station.

[0247] According to an embodiment of the present disclosure, when there are base stations and terminals that transmit and receive signals in an unlicensed spectrum, it can be assumed that the terminal is configured to perform PUCCH / PUSCH transmission in at least one time slot with a configuration authorization. In addition, the terminal can be scheduled to transmit multiple PUSCHs as a DCI through L1 or high-layer signaling from the base station. In addition, the terminal can receive at least one high-layer configuration for CG-PUSCH transmission from the base station, and the base station can activate at least one of the multiple CG-PUSCH transmission configurations configured for the terminal through a type 2 CG-PUSCH scheduling activation method.

[0248] According to an embodiment of the present disclosure, for the purpose of activating or releasing type 2 CG-PUSCH scheduling, the base station may send a DCI including a specific DCI field to the terminal. Hereinafter, a method for determining and interpreting a DCI including a specific field, performed by a terminal according to embodiment 2 of the present disclosure, will be described in detail.

[0249] Example 2-1

[0250] In the case where the terminal receives DCI (e.g., DCI format 0_1) indicating activation of type 2 CG-PUSCH transmission from the base station, when the DCI is used for multi-PUSCH scheduling, the terminal can determine that only information corresponding to a specific PUSCH (e.g., the first PUSCH) among the values set for multi-PUSCH scheduling in the field of the DCI is valid. This example is Figure 7 Shown in.

[0251] Figure 7 is a diagram illustrating an example of a method of identifying a field of DCI when multi-PUSCH scheduling is used according to an embodiment of the present disclosure.

[0252] refer to Figure 7 , scheduling can be sent from the base station to the terminal via PDCCH 700 Figure 7The activation of type 2 CG-PUSCH transmission may be indicated by a DCI sent to the terminal. In an embodiment of the present disclosure, the DCI sent to the terminal may include time domain resource allocation information for scheduling four PUSCHs. For example, the time domain resource allocation information may include a SLIV value. Figure 7 In the example, the SLIV values may include X0 705, X1 706, X2 707, and X3 708. In this case, the SLIV values may correspond to the scheduled PUSCHs, respectively. For example, X0 705 may correspond to the first PUSCH 701 (e.g., PUSCH #0), X1 706 may correspond to the second PUSCH 702 (e.g., PUSCH #1), and X2 707 may correspond to the third PUSCH 703 (e.g., PUSCH #2). X3 708 may correspond to the fourth PUSCH 704 (e.g., PUSCH #3).

[0253] In an embodiment of the present disclosure, the DCI may include an NDI value. For example, Figure 7 In the example, the NDI values may include Y0 709, Y1 710, Y2 711, and Y3 712. In this case, the SLIV values may correspond to the scheduled PUSCHs, respectively.

[0254] In addition, in an embodiment of the present disclosure, the DCI may include an RV value. Figure 7 In the example, RV values may include Z0 713, Z1 714, Z2 715, and Z3 716. In this case, the RV values may correspond to the scheduled PUSCHs, respectively.

[0255] When the base station instructs the terminal to activate type 2 CG-PUSCH transmission through the DCI scheduling four PUSCHs, the terminal determines that only the time domain resource allocation information (e.g., SLIV value X0 705) corresponding to the specific PUSCH (e.g., the first PUSCH 701) scheduled among the time domain resource allocation values indicated by the DCI is valid. Similarly, the terminal can determine that only the NDI value Y0 709 corresponding to the specific PUSCH (e.g., the first PUSCH 701) among the NDI values included in the DCI is valid. That is, the terminal can determine that the NDI value Y0 709 corresponding to the specific PUSCH (e.g., the first PUSCH 701) is used to verify the DCI indicating the activation of type 2 CG-PUSCH transmission (e.g., NDI = 0). Similarly, the terminal can determine that the RV value Z0 713 corresponding to the specific PUSCH (e.g., the first PUSCH 701) among the RV values included in the DCI is valid.

[0256] At the same time, the terminal may receive at least one higher-layer configuration for type 2 CG-PUSCH transmission from the base station. In this case, the terminal may determine that NDI values (e.g., Y1 710, Y2 711, and Y3 712) other than the NDI value Y0 709 corresponding to a specific PUSCH (e.g., the first PUSCH 701) among the NDI values are used as a specific DCI field for determining activation of type 2 CG-PUSCH transmission. For example, when NDI values (e.g., Y1 710, Y2 711, and Y3 712) other than the NDI value Y0 709 corresponding to a specific PUSCH (e.g., the first PUSCH 701) among the NDI values are all 0s, 1s, or a specific value, the terminal may determine that the DCI indicates activation of type 2 CG-PUSCH transmission.

[0257] Example 2-2

[0258] The terminal may receive at least one higher-layer configuration for type 2 CG-PUSCH transmission from the base station. When a field (e.g., "ChannelAccess-CPext") for providing at least one of a channel access procedure type, a CP length, a timing advance, or CAPC information is included in a DCI indicating activation of type 2 CG-PUSCH transmission received from the base station to the terminal, the terminal may determine the field as a specific DCI field for determining activation of type 2 CG-PUSCH transmission. For example, when a field of the received DCI indicates all 0s, 1s, or a specific value, the UE may determine that the corresponding DCI indicates activation of type 2 CG-PUSCH transmission.

[0259] It is also possible to activate or deactivate a method of type 2 GG-PUSCH (or DL SPS) scheduling through a combination of the above-mentioned embodiments or methods of the present disclosure.

[0260] Figure 8 is a flowchart of the operation of a base station according to an embodiment of the present disclosure.

[0261] refer to Figure 8In operation 800, the base station may configure a higher layer signal for the transmission and reception of the PDCCH, PDSCH, PUCCH, or PUSCH. That is, the base station may send a configuration related to the transmission and reception of the PDCCH, PDSCH, PUCCH, or PUSCH to the terminal through a higher layer signal. For example, the base station may send a PDCCH resource region to the terminal through a higher layer signal, in which the terminal may receive downlink or uplink scheduling information, CORESET configuration, search space configuration, etc. In addition, the base station may send a configuration related to the transmission and reception of the PDSCH / PUSCH to the terminal through a higher layer signal, including offset information between the PDCCH reception time slot and the PDSCH reception time slot, offset information between the PDCCH reception time slot and the PUSCH transmission time slot, PDSCH or PUSCH repeated transmission count information, etc. In addition, the base station may send a configuration related to configuration information for scheduling multiple PUSCHs with one DCI, interleaving structure configuration, and subcarrier spacing information for downlink reception or uplink transmission to the terminal through a higher layer signal.

[0262] In operation 810, the base station may configure a higher-layer signal for an uplink configuration grant. For example, the base station may additionally send configuration grant configuration information to the terminal, such as configuration grant transmission period and offset information (in the signal sent by the base station in operation 800). In addition, the base station may additionally send one or more pieces of configuration grant configuration information to the terminal. According to an embodiment of the present disclosure, the configuration grant configuration information sent from the base station to the terminal in operation 810 may be sent from the base station to the terminal in operation 800. According to an embodiment of the present disclosure, the configuration grant configuration information may refer to no-grant configuration information.

[0263] At operation 820, the base station may activate or release uplink configuration grant transmission of the terminal through DCI. That is, the base station may transmit information required to indicate activation or release of type 2 CG-PUSCH scheduling to the terminal through DCI.

[0264] In operation 830, the base station may receive and decode the configuration grant PUSCH. For example, the base station may receive the CG-PUSCH and the uplink control information included in the CG-PUSCH from the terminal based on the information configured by the base station to the terminal, and may decode the uplink control information included in the CG-PUSCH.

[0265] Figure 9 is a flowchart of an operation of a terminal according to an embodiment of the present disclosure.

[0266] refer to Figure 9In operation 900, the terminal may receive configuration information related to the transmission and reception of the PDCCH, PDSCH, PUCCH, or PUSCH from the base station through a higher layer signal. The configuration related to the transmission and reception of the PDCCH, PDSCH, PUCCH, or PUSCH may be performed based on the received configuration information. For example, the terminal may be configured with a PDCCH resource region, in which the terminal may receive downlink or uplink scheduling information, CORESET configuration, search space configuration, etc. from the base station through a higher layer signal. In addition, the terminal may be configured with configuration information related to scheduling multiple PUSCHs with one DCI, interleaving structure configuration, and subcarrier spacing information for downlink reception or uplink transmission from the base station through a higher layer signal.

[0267] In operation 910, the terminal may receive a higher layer signal for an uplink configuration grant. For example, the terminal may be additionally configured with configuration grant configuration information, such as a configuration grant transmission period and offset information (in addition to the information configured from the base station in operation 900). In addition, the terminal may be additionally configured with one or more pieces of configuration grant configuration information from the base station. According to an embodiment of the present disclosure, the configuration grant configuration information received by the terminal from the base station in operation 910 may be included in the configuration information added to the higher layer signal sent in operation 900 and may be sent to the terminal.

[0268] The terminal may receive DCI for Type 2 CG-PUSCH verification at operation 920. For example, in order to determine release or activation of Type 2 CG-PUSCH scheduling by receiving DCI, the terminal may receive DCI including necessary information from the base station.

[0269] In operation 930, the terminal may determine whether the subcarrier spacing to be used by the terminal is 15 kHz or whether the RB allocation information indicator based on RIV is to be used. When the terminal uses the subcarrier spacing of 15 kHz or the RB allocation information indicator for FDRA is based on RIV, the terminal may determine in operation 940 that when the FDRA indicator is all "1s", the DCI releases the type 2 CG-PUSCH.

[0270] When the terminal does not use a subcarrier spacing of 15 kHz or the RB allocation information indicator for FDRA is not based on RIV, that is, when the terminal uses a subcarrier spacing of 30 kHz or the RB allocation information indicator for FDRA is based on a bitmap, the terminal can determine in operation 950 that when the FDRA indicator is all "0", the DCI release type 2 CG-PUSCH.

[0271] Figure 10is a flowchart of operations of a base station for identifying activation of ungranted uplink transmission according to an embodiment of the present disclosure.

[0272] refer to Figure 10 In operation 1010, the base station may send uplink configuration information to the terminal. According to an embodiment of the present disclosure, the uplink configuration information may include an uplink frequency domain resource allocation indicator or subcarrier spacing information. For example, the uplink frequency domain resource allocation indicator may include a bitmap-based indicator that indicates RBs based on a bitmap, an RIV-based indicator that indicates RBs based on an RIV, etc. In an embodiment of the present disclosure, the subcarrier spacing information may include a value representing a parameter set for uplink signal transmission (e.g., a μ value), a subcarrier spacing value (e.g., 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, ...), etc.

[0273] In operation 1020, the base station may send a DCI including information related to activation of unlicensed uplink transmission to the terminal. According to an embodiment of the present disclosure, unlicensed uplink transmission may refer to a method of transmitting an uplink signal without uplink scheduling information. For example, unlicensed uplink transmission may include CG-PUSCH transmission. According to an embodiment of the present disclosure, the information related to activation of unlicensed uplink transmission may include an information field related to frequency allocation. In an embodiment of the present disclosure, the information field related to frequency allocation may refer to the FDRA field included in the DCI. Figure 10 In the embodiment, operation 1010 and operation 1020 have been described as separate operations, but are not limited thereto. That is, operation 1010 and operation 1020 may be performed simultaneously or may be performed separately.

[0274] In operation 1030, the base station may receive an uplink signal from the terminal based on the result of identifying information related to the activation of ungranted uplink transmission. For example, the information related to the activation of ungranted uplink transmission may be identified based on uplink configuration information. When it is determined based on the result of the identification that ungranted uplink transmission is activated, the terminal may use the ungranted uplink transmission method to send an uplink signal to the base station. However, when it is determined based on the result of the identification that ungranted uplink transmission is released, the terminal may release the ungranted uplink transmission. Therefore, the base station may not receive an uplink signal based on the ungranted uplink from the terminal.

[0275] Figure 11 is a flowchart of an operation of a terminal for identifying activation of ungranted uplink transmission according to an embodiment of the present disclosure.

[0276] refer to Figure 11At operation 1110, the terminal may receive uplink configuration information from the base station. According to an embodiment of the present disclosure, the uplink configuration information may include an uplink frequency domain resource allocation indicator or subcarrier spacing information. For example, the uplink frequency domain resource allocation indicator may include a bitmap-based indicator indicating RBs based on a bitmap, an RIV-based indicator indicating RBs based on an RIV, etc.

[0277] At operation 1120, the terminal may receive a DCI including information related to activation of unlicensed uplink transmission. According to an embodiment of the present disclosure, the information related to activation of unlicensed uplink transmission may include an information field related to frequency allocation. In an embodiment of the present disclosure, the information field related to frequency allocation may refer to an FDRA field included in the DCI. Figure 11 In the embodiment, operation 1110 and operation 1120 have been described as separate operations, but are not limited thereto. That is, operation 1110 and operation 1120 may be performed simultaneously or may be performed separately.

[0278] In operation 1130, the terminal may identify information related to activation of unlicensed uplink transmission based on the uplink configuration information. That is, the terminal may identify whether the information field related to frequency allocation indicates activation or release of unlicensed uplink transmission based on the uplink frequency domain resource allocation indicator or subcarrier spacing information.

[0279] For example, the terminal may be configured with an interleaving scheme (or FDRA type 2) from the base station as a frequency resource allocation method for CG-PUSCH transmission. When the terminal is configured with a subcarrier spacing of 15 kHz from the base station or the uplink frequency resource allocation indicator is an RIV-based indicator, the terminal may determine that unlicensed uplink (e.g., type 2 CG-PUSCH) scheduling is released when the bits of the information field related to frequency allocation (e.g., FDRA) are all "1". That is, the terminal may stop unlicensed uplink (e.g., type 2 CG-PUSCH) transmission.

[0280] Alternatively, when the terminal is configured with a 30 kHz subcarrier spacing from the base station or the uplink frequency resource allocation indicator is a bitmap-based indicator, the terminal can determine that ungranted uplink (e.g., Type 2 CG-PUSCH) scheduling is released when the bits of the information field related to frequency allocation (e.g., FDRA) are all "0". In other words, the terminal can stop ungranted uplink (e.g., Type 2 CG-PUSCH) transmission.

[0281] According to an embodiment of the present disclosure, the terminal may use only some bits (e.g., n bits) of the information field related to frequency allocation to identify activation or release of unlicensed uplink transmission. In this case, n bits may be less than the total number of bits corresponding to the information field related to frequency allocation.

[0282] According to an embodiment of the present disclosure, a terminal may recognize activation or release of unlicensed uplink transmission based on a reserved bit of an information field related to frequency allocation.

[0283] In operation 1140, the terminal may transmit an uplink signal to the base station based on the result of the identification. According to an embodiment of the present disclosure, when activation of unlicensed uplink transmission is identified, the terminal may transmit an uplink signal to the base station using unlicensed uplink transmission. Alternatively, when release of unlicensed uplink transmission is identified, the terminal may release unlicensed uplink transmission. Figures 8 to 11 As shown, the terminal or the base station can recognize activation or release of ungranted uplink transmission. Figure 12 and Figure 13 The internal structures of a base station and a terminal according to various embodiments of the present disclosure are shown.

[0284] Figure 12 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure.

[0285] refer to Figure 12 , a base station according to an embodiment of the present disclosure may include a base station receiver 1200, a base station transmitter 1210, and a base station processor 1220. However, the elements of the base station are not limited to the above examples. For example, the base station may include more or fewer elements than the aforementioned elements. In addition, the base station receiver 1200, the base station transmitter 1210, and the base station processor 1220 may be implemented in the form of a single chip.

[0286] In the embodiments of the present disclosure, the base station receiver 1200 and the base station transmitter 1210 may be collectively referred to as a transceiver. The transceiver can transmit and receive signals with the terminal. These signals may include control information and data. To this end, the transceiver may include an RF transmitter that up-converts and amplifies the frequency of the signal to be transmitted, and an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency of the received signal. In addition, the transceiver can receive signals via a radio channel, output the received signals to the base station processor 1220, and transmit the output signals of the base station processor 1220 via the radio channel.

[0287] According to an embodiment of the present disclosure, the base station processor 1220 can control a series of processes so that the base station operates according to the above-mentioned embodiment of the present disclosure. For example, according to an embodiment of the present disclosure, the elements of the base station can be controlled to execute a method for sending DCI. For example, the base station processor 1220 can perform a channel access process for an unlicensed spectrum. For a specific example, the base station receiver 1200 can receive a signal sent through an unlicensed spectrum. The base station processor 1220 can determine whether the unlicensed spectrum is in an idle state by comparing the strength of the received signal with a predefined threshold or a threshold calculated by a function having bandwidth, etc. as a factor. For another example, the base station processor 1220 can construct or change DCI information for instructing the base station to release or activate type 2 CG-PUSCH scheduling.

[0288] According to an embodiment of the present disclosure, the base station processor 1220 may include at least one processor. The at least one processor may execute a program stored in a memory to perform the above-mentioned DCI transmission operation according to an embodiment of the present disclosure.

[0289] Despite Figure 12 Although not shown in the figure, the base station may further include a memory. According to an embodiment of the present disclosure, the memory may store programs and data required for the operation of the base station. In addition, the memory may store control information or data included in the signals sent and received by the base station. The memory may be implemented as a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disc read-only memory (CD-ROM) and a digital versatile disk (DVD) or a combination thereof. In addition, the base station may include multiple memories. According to an embodiment of the present disclosure, the memory may store a program for performing the above-mentioned DCI transmission operation according to an embodiment of the present disclosure.

[0290] Figure 13 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.

[0291] refer to Figure 13 According to an embodiment of the present disclosure, a terminal may include a terminal receiver 1300, a terminal transmitter 1310, and a terminal processor 1320. However, the elements of the terminal are not limited to the above examples. For example, the terminal may include more or fewer elements than the aforementioned elements. In addition, the terminal receiver 1300, the terminal transmitter 1310, and the terminal processor 1320 may be implemented in the form of a single chip.

[0292] In the embodiments of the present disclosure, the terminal receiver 1300 and the terminal transmitter 1310 may be collectively referred to as a transceiver. The transceiver can transmit and receive signals with a base station. These signals may include control information and data. To this end, the transceiver may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that performs low-noise amplification and down-converts the frequency of the received signal. Furthermore, the transceiver may receive signals via a radio channel, output the received signals to the terminal processor 1320, and transmit the output signals of the terminal processor 1320 via the radio channel.

[0293] According to an embodiment of the present disclosure, the terminal processor 1320 may control a series of processes so that the terminal operates according to the above-mentioned embodiment of the present disclosure. For example, according to an embodiment of the present disclosure, the elements of the terminal may be controlled to perform a method for receiving DCI.

[0294] For example, the terminal receiver 1300 may receive a data signal including a control signal. The terminal processor 1320 may determine the result of receiving the data signal. When it is necessary to send a first signal reception result including data reception to the base station at a subsequent timing, the terminal transmitter 1310 may send the first signal reception result to the base station at a timing determined by the terminal processor 1320. For another example, the terminal receiver 1300 may receive a DCI from the base station that can verify the activation or release of the type 2 CG-PUSCH. The terminal processor 1320 may determine whether the DCI activates or releases the type 2 CG-PUSCH based on a specific field value of the received DCI. When it is determined that the DCI releases the type 2 CG-PUSCH, the terminal may stop sending the CG-PUSCH in the terminal transmitter 1310.

[0295] According to an embodiment of the present disclosure, the terminal processor 1320 may include at least one processor. The at least one processor may execute a program stored in a memory to perform the above-mentioned DCI reception operation according to an embodiment of the present disclosure.

[0296] Despite Figure 13 Although not shown, the terminal may further include a memory. According to an embodiment of the present disclosure, the memory may store programs and data required for the operation of the terminal. In addition, the memory may store control information or data included in signals sent and received by the terminal. The memory may be implemented as a storage medium such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination thereof. In addition, the terminal may include multiple memories. According to an embodiment of the present disclosure, the memory may store a program for performing the above-mentioned DCI reception operation according to an embodiment of the present disclosure.

[0297] The methods according to the embodiments of the present disclosure described in the claims or the detailed description can be implemented as hardware, software, or a combination of hardware and software.

[0298] When implemented as software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium or computer program product are configured to be executable by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods according to the embodiments of the present disclosure, which are described in the claims or description of the present disclosure.

[0299] One or more programs (software modules, software, etc.) may be stored in RAM, non-volatile memory including flash memory, ROM, electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, CD-ROM, DVD, other types of optical storage devices, or cassette tapes. Alternatively, one or more programs may be stored in a memory provided by a combination of all or part of these devices. In addition, each memory may include multiple configured memories.

[0300] In addition, one or more programs can be stored in an attachable storage device, which can be accessed by a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN) or a storage area network (SAN) or a combination thereof. These storage devices can be connected to the equipment of the embodiments of the present disclosure through an external port. In addition, the independent storage device on the communication network can access the equipment of the embodiments of the present disclosure.

[0301] According to an embodiment of the present disclosure, a method and apparatus capable of effectively providing services in a wireless communication system may be provided.

[0302] As used herein, the term "computer program product" or "computer-readable medium" is used to collectively refer to media, such as memory, a hard disk installed in a hard drive, and signals. According to an embodiment of the present disclosure, the "computer program product" or "computer-readable medium" is used to provide a method for transmitting and receiving DCI.

[0303] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station via radio resource control (RRC) signaling, first information for configuring a frequency domain resource allocation (FDRA) type 2 and second information on a subcarrier spacing for uplink transmission; receiving downlink control information DCI including third information about the FDRA from the base station; identifying, based on the first information and the second information, third information indicating release of scheduling of a type 2 configuration granting a physical uplink shared channel (PUSCH); as well as In case all bits of the third information for FDRA type 2 are set to 0 and the second information is set to μ=1, the release type 2 configuration grants scheduling of the PUSCH.

2. The method according to claim 1, wherein DCI also includes hybrid automatic repeat request HARQ process number information, redundancy version information, and modulation and coding scheme information, as well as Among them, when all bits of the HARQ process number information are set to 0, all bits of the redundant version information are set to 0, all bits of the modulation and coding scheme information are set to 1, and all bits of the FDRA are set to 1, the scheduling of the type 2 configuration authorization PUSCH is released.

3. The method according to claim 1, in, When all bits of the third information are set to 1 and the second information is set to μ=0, the release type 2 configuration grants scheduling of the PUSCH.

4. The method according to claim 1, further comprising: The scheduling of the type 2 configuration grant PUSCH is activated based on the hybrid automatic repeat request HARQ process number information and redundancy version information contained in the DCI.

5. The method according to claim 4, in, When all bits of the HARQ process number information are set to 0 and all bits of the redundancy version information are set to 0, activation type 2 configuration grants scheduling of the PUSCH.

6. A method performed by a base station in a wireless communication system, the method comprising: Sending, via radio resource control RRC signaling, first information for configuring frequency domain resource allocation FDRA type 2 and second information about a subcarrier spacing for uplink transmission to the terminal; as well as Sending downlink control information DCI including third information about FDRA to the terminal; identifying third information indicating release of scheduling of a type 2 configuration grant physical uplink shared channel PUSCH based on the first information and the second information, In the case where all bits of the third information for FDRA type 2 are set to 0 and the second information is set to μ=1, the type 2 configuration granting scheduling of the PUSCH is released.

7. A terminal in a wireless communication system, the terminal comprising: transceiver; and At least one processor configured to: receiving, via radio resource control (RRC) signaling, first information for configuring a frequency domain resource allocation (FDRA) type 2 and second information on a subcarrier spacing for uplink transmission from a base station, receiving downlink control information DCI including third information about FDRA from the base station, identifying third information indicating release of scheduling of a type 2 configuration grant physical uplink shared channel PUSCH based on the first information and the second information, and In case all bits of the third information for FDRA type 2 are set to 0 and the second information is set to μ=1, the release type 2 configuration grants scheduling of the PUSCH.

8. A base station in a wireless communication system, the base station comprising: transceiver; and At least one processor configured to: transmitting, via radio resource control RRC signaling, first information for configuring frequency domain resource allocation FDRA type 2 and second information on subcarrier spacing for uplink transmission to the terminal; and sending downlink control information DCI including third information about FDRA to the terminal, identifying third information indicating release of scheduling of a type 2 configuration grant physical uplink shared channel PUSCH based on the first information and the second information, In the case where all bits of the third information for FDRA type 2 are set to 0 and the second information is set to μ=1, the type 2 configuration granting scheduling of the PUSCH is released.

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