Method and apparatus for determination of downlink feedback information in wireless communication system

Abstract

The present disclosure relates to a communication technique and a system for integrating a 5G communication system with IoT technology to support higher data transmission rates than those of 4G systems. The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. Additionally, the present disclosure proposes a method for determining downlink feedback information in a wireless communication system.

Description

Technology Field

[0001] The present disclosure relates to a method and apparatus for determining downlink feedback information in a wireless communication system. Background Technology

[0002] Efforts are being made to develop improved 5G (5th-Generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic following the commercialization of 4G (4th-Generation) communication systems. For this reason, 5G communication systems or pre-5G communication systems are referred to as communication systems beyond 4G networks or post-LTE systems following LTE (long term evolution) / LTE-A (LTE advanced) systems.

[0003] To achieve high data transmission rates, 5G communication systems are being considered for implementation in the mmWave band (e.g., the 60 GHz band). To mitigate path loss and increase the transmission distance of radio waves in the mmWave band, beamforming, massive array multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large-scale antenna technologies are being discussed for 5G communication systems.

[0004] In addition, to improve the network of the system, the development of technologies such as advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device-to-device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (coordinated multi-points), and interference cancellation is taking place in 5G communication systems.

[0005] In addition, advanced coding modulation (ACM) methods such as FQAM (hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM)) and SWSC (sliding window superposition coding), as well as advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access), are being developed in 5G systems.

[0006] Meanwhile, the Internet is evolving from a human-centric network where humans generate and consume information into an IoT (Internet of Things) network that processes information by exchanging it among distributed components, such as objects. IoE (Internet of Everything) technology, which combines IoT with Big Data processing technologies through connections with cloud servers, is also emerging. To implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required; consequently, technologies such as sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC) are currently being researched to facilitate the connection of objects. In an IoT environment, intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects can be provided. Through the convergence and integration of existing IT technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0007] Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology, as previously described, can also be considered an example of the convergence of 5G and IoT technologies.

[0008] With the advancement of mobile communication systems as described above, it has become possible to provide various services. As wireless communication networks have become more complex and diverse, the need has arisen for a method to allocate data channels for downlinks and uplinks more efficiently. The problem to be solved

[0009] The present disclosure provides a method and apparatus for determining downlink feedback information in a wireless communication system.

[0010] The present disclosure provides a method and apparatus for determining downlink feedback information according to a network identifier used in a downlink control channel that transmits downlink feedback information in a wireless communication system. means of solving the problem

[0011] The present invention, for solving the above-mentioned problems, is characterized in that a method for processing a control signal in a wireless communication system comprises: a step of receiving a first control signal transmitted from a base station; a step of processing the received first control signal; and a step of transmitting a second control signal generated based on the processing to the base station. Effects of the invention

[0012] According to one embodiment of the present disclosure, a method for more efficiently allocating data channels for downlink and uplink in a wireless communication system may be provided. Brief explanation of the drawing

[0013] FIG. 1 is a drawing illustrating a wireless communication system according to one embodiment of the present disclosure. FIG. 2 is a drawing illustrating the configuration of a base station in a wireless communication system according to one embodiment of the present disclosure. FIG. 3 is a drawing illustrating the configuration of a terminal in a wireless communication system according to one embodiment of the present disclosure. FIG. 4 is a drawing illustrating the configuration of a communication unit in a wireless communication system according to one embodiment of the present disclosure. Figure 5 is a diagram illustrating the frame, subframe, and slot structure of a 5G communication system. Figure 6 is a diagram illustrating the basic structure of the time-frequency domain of a 5G communication system. FIG. 7 is a diagram illustrating an example of setting a bandwidth part and an in-cell protection section of a 5G communication system. FIG. 8 is a diagram illustrating an example of a control resource set setting for a downlink control channel of a 5G communication system. Figure 9 is a diagram illustrating the structure of a downlink control channel of a 5G communication system. Figure 10 is a diagram illustrating an example of an uplink-downlink setup in a 5G communication system. FIG. 11 is a diagram illustrating an example of a channel access procedure for quasi-static channel occupation in a wireless communication system according to one embodiment of the present disclosure. FIG. 12 is a diagram illustrating an example of a channel access procedure for dynamic channel occupation in a wireless communication system according to one embodiment of the present disclosure. FIG. 13 is a drawing illustrating an example of a second up / down link transmission method in a wireless communication system according to one embodiment of the present disclosure. FIG. 14 is a drawing illustrating examples of a code block and a code block group in a wireless communication system according to one embodiment of the present disclosure. FIG. 15 is a flowchart illustrating the operation of a base station according to one embodiment of the present disclosure. FIG. 16 is a flowchart illustrating the operation of a terminal according to one embodiment of the present disclosure. Specific details for implementing the invention

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0015] In describing the present disclosure, technical details that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure are omitted. This is intended to convey the essence of the present disclosure more clearly without obscuring it by omitting unnecessary explanations. Furthermore, the terms described below are defined considering their functions within the present disclosure, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0016] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0017] The advantages and features of the present disclosure, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the specification.

[0018] Hereinafter, a base station (BS) is an entity that performs resource allocation for terminals and may be at least one of gNode B, eNode B, Node B (or xNode B (where x is an alphabet including g and e)), a radio access unit, a base station controller, a satellite, an airborn, or a node on a network. A terminal (user equipment: UE) may include a Mobile Station (MS), a Vehicular, a satellite, an airborn, a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a radio transmission path for a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a radio transmission path for a signal transmitted by a terminal to a base station. Additionally, a sidelink (SL) may exist, which refers to a radio transmission path for a signal transmitted by a terminal to another terminal.

[0019] In addition, while LTE, LTE-A, or 5G systems may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5G-Advance or NR-Advance or 6th generation mobile communication technology (6G) developed after 5G mobile communication technology (or new radio, NR) may be included, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0020] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0021] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0022] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0023] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards like 3GPP’s HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE’s 802.16e.

[0024] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs the Orthogonal Frequency Division Multiplexing (OFDM) method for the downlink (DL) and the Single Carrier Frequency Division Multiple Access (SC-FDMA) method for the uplink (UL). The uplink refers to a wireless link through which a terminal transmits data or control signals to a base station, and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above-mentioned multiple access method can distinguish the data or control information of each user by allocating and operating time-frequency resources to be sent for each user so that they do not overlap, that is, so that orthogonality is established.

[0025] As a future communication system following LTE, that is, a 5G communication system, it must be able to freely reflect the diverse requirements of users and service providers, and therefore, services that satisfy various requirements simultaneously must be supported. Services being considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0026] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, it necessitates improvements in various transmission and reception technologies, including enhanced Multi-Input Multi-Output (MIMO) transmission technology. Additionally, while LTE transmits signals using a maximum bandwidth of 20 MHz in the 2 GHz band, the 5G communication system can meet the data transmission speeds required by using a frequency bandwidth wider than 20 MHz in frequency bands of 3–6 GHz or above 6 GHz.

[0027] mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for the connection of a large number of terminals within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT provides communication functions by attaching to various sensors and devices, a large number of terminals within a cell (e.g., 1,000,000 terminals / km²) 2 It must be able to support mMTC. Since terminals supporting mMTC are likely to be located in dead zones where cells cannot cover, such as building basements, due to the nature of the service, they may require wider coverage compared to other services provided by the 5G communication system. Terminals supporting mMTC must consist of low-cost devices, and since it is difficult to frequently replace the device's battery, a very long battery life of 10 to 15 years may be required.

[0028] URLLC is a mission-critical cellular-based wireless communication service. Examples include services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For instance, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and simultaneously require a packet error rate of 10⁻⁵ or less. Consequently, for services supporting URLLC, 5G systems must provide a Transmit Time Interval (TTI) smaller than other services, and design considerations may be required to allocate wide resources within the frequency band to ensure the reliability of the communication link.

[0029] The three 5G services, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. In this case, different transmission and reception techniques and parameters may be used between the services to satisfy the different requirements of each service. Of course, 5G is not limited to the three services mentioned above.

[0030] FIG. 1 is a drawing illustrating a wireless communication system according to one embodiment of the present disclosure. FIG. 1 illustrates a base station (110), a terminal (120), and a terminal (130) as part of the nodes utilizing a wireless channel in the wireless communication system. FIG. 1 illustrates only one base station as an example, but other base stations identical or similar to the base station (110) may be additionally included.

[0031] Referring to FIG. 1, a base station (110) may be a network infrastructure that provides wireless access to terminals (120, 130). The base station (110) has coverage defined as a specific geographical area based on the reach of a wireless signal transmission. The base station (110) may be referred to as an 'access point (AP)', 'eNodeB (eNB)', 'gNodeB (gNB)', '5G node (5th generation node)', 'wireless point', 'transmission / reception point (TRP)', or other terms having an equivalent technical meaning.

[0032] Each of the terminal (120) and terminal (130) is a device that can be used by a user and can perform communication with the base station (110) via a wireless channel. In some cases, at least one of the terminal (120) and terminal (130) may be operated without user involvement. That is, at least one of the terminal (120) and terminal (130) is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the terminal (120) and terminal (130) may be referred to as a 'mobile station', 'subscriber station', 'remote terminal', 'wireless terminal', or 'user device' or other terms having an equivalent technical meaning.

[0033] A wireless communication environment may include wireless communication in unlicensed bands as well as in licensed bands. A base station (110), a terminal (120), and a terminal (130) may transmit and receive wireless signals in unlicensed bands (e.g., 5GHz to 7.125GHz band, ~71GHz band). In one embodiment, a cellular communication system and another communication system (e.g., a wireless local area network, WLAN) may coexist in an unlicensed band. To ensure fairness between the two communication systems, that is, to prevent a situation where a channel is used exclusively by one system, the base station (110), the terminal (120), and the terminal (130) may perform a channel access procedure for the unlicensed band. As an example of a channel access procedure for the unlicensed band, the base station (110), the terminal (120), and the terminal (130) may perform LBT (listen before talk).

[0034] A base station (110), a terminal (120), and a terminal (130) can transmit and receive wireless signals in a millimeter wave (mmWave) band (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). At this time, to improve channel gain, the base station (110), the terminal (120), and the terminal (130) can perform beamforming. Here, beamforming may include transmit beamforming and / or receive beamforming. That is, the base station (110), the terminal (120), and the terminal (130) can impart directivity to the transmit signal or the receive signal. To this end, the base station (110) and the terminals (120, 130) can select serving beams through a beam search or beam management procedure. After serving beams are selected, subsequent communication can be performed through a resource that is in a quasi-co-located (QCL) relationship with the resource that transmitted the serving beams.

[0035] The base station (110) can select a beam (112 or 113) of a specific direction. The base station (110) can perform communication with a terminal using the beam (112 or 113) of the specific direction. For example, the base station (110) can receive a signal from the terminal (120) or transmit a signal to the terminal (120) using the beam (112). The terminal (120) can receive a signal from the base station (110) or transmit a signal to the base station (110) using the beam (121). Additionally, the base station (110) can receive a signal from the terminal (130) or transmit a signal to the terminal (130) using the beam (113). The terminal (130) can receive a signal from the base station (110) or transmit a signal to the base station (110) using the beam (131).

[0037] FIG. 2 is a drawing illustrating the configuration of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0038] The configuration exemplified in FIG. 2 can be understood as the configuration of the base station (110) of FIG. 1. Terms such as ‘~ unit’, ‘~ unit’ used below refer to a unit that processes at least one function or operation, and this can be implemented as hardware or software, or a combination of hardware and software.

[0039] Referring to FIG. 2, the base station may include a wireless communication unit (210), a backhaul communication unit (220), a storage unit (230), and a control unit (240).

[0040] A wireless communication unit (210) (which may be interchangeable with a transceiver) can perform functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit (210) can perform conversion functions between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting a signal, the wireless communication unit (210) can generate complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving a signal, the wireless communication unit (210) can restore the transmitted bit sequence by demodulating and decoding the received baseband signal.

[0041] Additionally, the wireless communication unit (210) can up-convert a baseband signal into an RF (radio frequency) band signal and transmit it through an antenna, and down-convert an RF band signal received through an antenna into a baseband signal. To this end, the wireless communication unit (210) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Additionally, the wireless communication unit (210) may include a plurality of RF chains corresponding to a plurality of transmission and reception paths. Furthermore, the wireless communication unit (210) may include at least one antenna array composed of a plurality of antenna elements.

[0042] In terms of hardware, the wireless communication unit (210) may be composed of a digital unit and an analog unit, and the analog unit may be composed of a plurality of sub-units depending on operating power, operating frequency, etc. The digital unit may be implemented with at least one processor (e.g., a digital signal processor (DSP)).

[0043] The wireless communication unit (210) can transmit and receive signals as described above. Accordingly, all or part of the wireless communication unit (210) may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. Furthermore, in the following description, transmission and reception performed through a wireless channel are used to mean that processing as described above is performed by the wireless communication unit (210). According to one embodiment, the wireless communication unit (210) may include at least one transceiver.

[0044] The backhaul communication unit (220) can provide an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (220) can convert a bit sequence transmitted from a base station to another node, e.g., another connection node, another base station, an upper node, a core network, etc., into a physical signal, and can convert a physical signal received from another node into a bit sequence.

[0045] The storage unit (230) can store data such as basic programs, application programs, and configuration information for the operation of the base station. The storage unit (230) may be composed of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. Additionally, the storage unit (230) may provide stored data upon a request from the control unit (240). In one embodiment, the storage unit (230) may include at least one memory.

[0046] The control unit (240) can control the overall operations of the base station. For example, the control unit (240) can transmit and receive signals through the wireless communication unit (210) or through the backhaul communication unit (220). Additionally, the control unit (240) can write and read data from the storage unit (230). Furthermore, the control unit (240) can perform the functions of the protocol stack required by the communication standard. In one embodiment, the protocol stack may be included in the wireless communication unit (210). In one embodiment, the control unit (240) may include at least one processor.

[0047] The control unit (240) can control the base station to perform operations according to at least one of the various embodiments described below. For example, the control unit (240) can perform a channel access procedure for an unlicensed band. For example, the control unit (240) receives signals transmitted to the unlicensed band from a transceiver (e.g., a wireless communication unit (210)), and the control unit (240) can determine whether the unlicensed band is idle by comparing the strength of the received signal described above with a threshold value determined by a function that takes bandwidth as a factor or is predefined. Additionally, for example, the control unit (240) can transmit a control signal to a terminal or receive a control signal from a terminal through the transceiver. Additionally, the control unit (240) can transmit data to a terminal or receive data from a terminal through the transceiver. The control unit (240) can determine the transmission result for the signal transmitted to the terminal based on the control signal or data signal received from the terminal. The control unit (240) may configure one downlink control information (DCI) for allocating one or more data channels to one or more cells and transmit the DCI to a terminal via the wireless communication unit (210). Additionally, prior to the transmission of the DCI, the control unit (240) may provide the terminal with configuration information necessary to allocate one or more data channels by the DCI through upper layer signaling. Furthermore, the control unit (240) may transmit a data channel to the terminal or receive a data channel from the terminal based on the configuration information and the information fields included in the DCI.

[0048] Additionally, for example, the control unit (240) may maintain or change the length of the contention window (CW) for the channel access procedure (hereinafter, contention window adjustment) based on the transmission result, that is, based on the terminal's reception result of the control signal or data signal. According to one embodiment, the control unit (240) may determine a reference window to obtain the transmission result for contention window adjustment. The control unit (240) may determine a data channel for contention window adjustment in the reference window. The control unit (240) may determine a reference control channel for contention window adjustment in the reference window. If it is determined that the unlicensed band is idle, the control unit (240) may occupy the channel.

[0049] Additionally, the control unit (240) can receive uplink control information (UCI) from a terminal via the wireless communication unit (210) and control the downlink data channel to determine whether retransmission is necessary and / or whether a change in modulation and coding method is necessary through one or more HARQ-ACK (hybrid automatic repeat request acknowledgment) information and / or Channel State Information (CSI) included in the uplink control information described above. Additionally, the control unit (240) can generate downlink control information that schedules the initial or retransmission of downlink data or requests the transmission of uplink control information, and control the transmission of the downlink control information described above to the terminal via the wireless communication unit (210). Additionally, the control unit (240) can control the wireless communication unit (210) described above to receive (re)transmitted uplink data and / or uplink control information according to the downlink control information described above.

[0050] FIG. 3 is a drawing illustrating the configuration of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0051] The configuration exemplified in FIG. 3 can be understood as the configuration of the terminal (120 or 130) of FIG. 1. Terms such as ‘~part’, ‘~unit’ used below refer to a unit that processes at least one function or operation, and this can be implemented as hardware or software, or a combination of hardware and software.

[0052] Referring to FIG. 3, the terminal may include a wireless communication unit (310), a storage unit (320), and a control unit (330).

[0053] A wireless communication unit (310) (which may be used interchangeably with a transceiver) can perform functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit (310) can perform conversion functions between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting a signal, the wireless communication unit (310) can generate complex symbols by encoding and modulating the transmitted bit sequence. Also, when receiving a signal, the wireless communication unit (310) can restore the transmitted bit sequence by demodulating and decoding the received baseband signal. Additionally, the wireless communication unit (310) can up-convert the baseband signal into an RF band signal and transmit it through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the wireless communication unit (310) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc.

[0054] Additionally, the wireless communication unit (310) may include a plurality of transmission and reception paths. Furthermore, the wireless communication unit (310) may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit (310) may be composed of a digital unit and an analog unit (e.g., a radio frequency integrated circuit (RFIC)). Here, the digital unit and the analog unit may be implemented as a single package. Additionally, the wireless communication unit (310) may include a plurality of RF chains. Furthermore, the wireless communication unit (310) may include at least one antenna array composed of a plurality of antenna elements to perform beamforming.

[0055] The wireless communication unit (310) can transmit and receive signals as described above. Accordingly, all or part of the wireless communication unit (310) may be referred to as a 'transmitter', a 'receiver', or a 'transmitter / receiver'. Furthermore, in the following description, transmission and reception performed through a wireless channel are used to mean that processing as described above is performed by the wireless communication unit (310). According to one embodiment, the wireless communication unit (310) may include at least one transceiver.

[0056] The storage unit (320) can store data such as basic programs, application programs, and setting information for the operation of the terminal. The storage unit (320) may be composed of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. Additionally, the storage unit (320) may provide stored data upon a request from the control unit (330). According to one embodiment, the storage unit (320) may include at least one memory.

[0057] The control unit (330) can control the overall operations of the terminal. For example, the control unit (330) can transmit and receive signals through the wireless communication unit (310). Additionally, the control unit (330) writes and reads data to and from the storage unit (320). Furthermore, the control unit (330) can perform the functions of the protocol stack required by the communication standard. To this end, the control unit (330) may include at least one processor or microprocessor, or be part of a processor. According to one embodiment, the control unit (330) may include at least one processor. Also, according to one embodiment, part of the wireless communication unit (310) and / or the control unit (330) may be referred to as a communication processor (CP).

[0058] The control unit (330) can control the terminal to perform operations according to at least one of the various embodiments described below. For example, the control unit (330) can receive a downlink signal (downlink control signal or downlink data) transmitted by a base station through a transceiver (e.g., a communication unit (310)). Additionally, for example, the control unit (330) can determine a transmission result for the downlink signal. The transmission result may include ACK (ACKnowledgement), NACK (Negative ACK), DTX (Discontinuous Transmission), etc., as feedback for the transmitted downlink signal. In this disclosure, the transmission result may be referred to by various terms such as the reception status of the downlink signal, the reception result, the decoding result, HARQ-ACK information, etc. Additionally, for example, the control unit (330) can transmit an uplink signal to the base station through the transceiver as a response signal for the downlink signal. The uplink signal may explicitly or implicitly include the transmission result of the downlink signal. Additionally, for example, the control unit (330) may transmit uplink control information to a base station via the wireless communication unit (310), including at least one of the above-described HARQ-ACK information and / or channel state information (CSI) in the uplink control information. At this time, the uplink control information may be transmitted through the uplink data channel together with uplink data, or transmitted to the base station through the uplink data channel without uplink data.

[0059] The control unit (330) can perform a channel access procedure for an unlicensed band. For example, the wireless communication unit (310) receives signals transmitted to the unlicensed band, and the control unit (330) can determine whether the unlicensed band is idle by comparing the strength of the received signal described above with a threshold value determined by a function that takes bandwidth as a factor or is predefined. The control unit (330) can perform a connection procedure for the unlicensed band to transmit a signal to a base station. Additionally, the control unit (330) can determine an uplink transmission resource to transmit uplink control information using at least one of the results of the channel access procedure described above and downlink control information received from the base station, and transmit uplink control information to the base station through the transceiver.

[0060] The control unit (330) can receive upper-layer signaling from a base station via a wireless communication unit (310), which includes configuration information necessary to receive one downlink control information (DCI) configured to allocate one or more data channels to one or more cells. The control unit (330) also receives the DCI based on the configuration information and interprets the fields included in the DCI. Additionally, the control unit (330) can transmit a data channel to a base station or receive a data channel from a base station based on the configuration information and the information fields included in the DCI.

[0062] FIG. 4 is a drawing illustrating the configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. FIG. 4 may illustrate an example of the detailed configuration of the wireless communication unit (210) of FIG. 2 or the wireless communication unit (310) of FIG. 3. Specifically, FIG. 4 may illustrate components for performing beamforming as part of the wireless communication unit (210) of FIG. 2 or the wireless communication unit (310) of FIG. 3.

[0063] Referring to FIG. 4, the wireless communication unit (210) or the wireless communication unit (310) may include an encoding and modulation unit (402), a digital beamforming unit (404), a plurality of transmission paths (406-1 to 406-N) and an analog beamforming unit (408).

[0064] The encoding and modulation unit (402) can perform channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulation unit (402) can generate modulation symbols by performing contellation mapping on the encoded bits.

[0065] The digital beamforming unit (404) can perform beamforming on a digital signal (e.g., modulation symbols). To do this, the digital beamforming unit (404) can multiply the modulation symbols by beamforming weights. Here, the beamforming weights can be used to change the magnitude and phase of the signal and may be referred to as a 'precoding matrix', 'precoder', etc. The digital beamforming unit (404) can output digitally beamformed (i.e. precoded) modulation symbols to multiple transmission paths (406-1 to 406-N). At this time, according to a multiple input multiple output (MIMO) transmission technique, the modulation symbols may be multiplexed, or the same modulation symbols may be provided to multiple transmission paths (406-1 to 406-N).

[0066] Multiple transmission paths (406-1 to 406-N) can convert digitally beamformed digital signals into analog signals. To this end, each of the multiple transmission paths (406-1 to 406-N) may include an inverse fast Fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a digital-to-analog converter (DAC), and an up-conversion unit. The CP insertion unit is intended for orthogonal frequency division multiplexing (OFDM) schemes and may be excluded when other physical layer schemes (e.g., filter bank multi-carrier, FBMC) are applied. The multiple transmission paths (406-1 to 406-N) may provide independent signal processing processes for multiple streams generated through digital beamforming. Depending on the implementation method, some of the components of the multiple transmission paths (406-1 to 406-N) may be shared.

[0067] The analog beamforming unit (408) can perform beamforming on analog signals from multiple transmission paths (406-1 to 406-N) and connect them to at least one antenna array composed of multiple antenna elements. To do this, the analog beamforming unit (408) can multiply the analog signals by beamforming weights. Here, the beamforming weights can be used to change the magnitude and phase of the signals. Depending on the connection structure between the multiple transmission paths (406-1 to 406-N) and the antennas, the analog beamforming unit (408) can be configured in various ways. For example, each of the multiple transmission paths (406-1 to 406-N) can be connected to a single antenna array. As another example, the multiple transmission paths (406-1 to 406-N) can be connected to a single antenna array. As another example, multiple transmission paths (406-1 to 406-N) may be adaptively connected to one antenna array or to two or more antenna arrays.

[0068]

[0069] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0070] Figure 5 is a diagram illustrating the frame, subframe, and slot structure of a 5G communication system.

[0071] FIG. 5 illustrates an example of a frame (500), subframe (501), and slot (502, 503, 504) structure for the case where μ=0 (505) indicates a subcarrier spacing of 15 kHz and μ=1 (506) indicates a subcarrier spacing of 30 kHz. As shown in FIG. 5, for a 5G system, one frame (500) can be defined as 10 ms. One subframe (501) can be defined as 1 ms, and thus one frame (500) can be composed of a total of 10 subframes (501). One subframe (501) can be composed of one or multiple slots. One slot can be composed of or defined as 14 OFDM symbols. That is, the number of symbols per slot ( ) is 14. At this time, the number of slots per 1 subframe (501) ( ) may vary depending on the value (numerology) μ (505, 506) representing the setting for subcarrier spacing. For example, if μ=0, 1 subframe (501) may consist of one slot (502), and if μ=1, 1 subframe (501) may consist of two slots (503, 504).

[0072] Since the number of slots per subframe may vary depending on the setting value μ for the subcarrier spacing, accordingly, the number of slots per frame ( ) can also vary. Depending on each subcarrier interval setting value μ and μ and It can be defined as shown in below. When μ=2, the terminal may additionally receive a setting regarding a cyclic prefix from the base station through upper layer signaling.

[0073] Cyclic prefix 0 15 Normal 14 10 1 1 30 Normal 14 20 2 2 60 Normal, Extended 14 40 4 3 120 Normal 14 80 8 4 240 Normal 14 160 16

[0074] In the present disclosure, higher layer signaling or higher signal may refer to at least one of radio resource control (RRC) signaling, packet data convergence protocol (PDCP) signaling, or a media access control (MAC) control element (MAC CE). Additionally, the higher layer signaling or higher signal may include system information transmitted commonly to multiple terminals, e.g., a system information block (SIB), and may also include information transmitted via a physical broadcast channel (PBCH) excluding the master information block (MIB) (e.g., a PBCH payload). In this case, the MIB may also be expressed as being included in the aforementioned higher layer signaling or higher signal.

[0075] <Carrier bandwidth>

[0076] FIG. 6 is a diagram illustrating the basic structure of the time-frequency domain of a 5G communication system. That is, FIG. 6 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource area where data or control channels are transmitted in a 5G system.

[0077] The horizontal axis of FIG. 6 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE) (601), which can be defined as one Orthogonal Frequency Division Multiplexing (OFDM) symbol (602) in the time domain and one subcarrier (603) in the frequency domain. In the frequency domain (For example, 12) consecutive REs can form a single resource block (RB) (604).

[0078] For each subcarrier interval setting value μ and carrier, 2 subcarriers and A resource grid consisting of multiple OFDM symbols is a Common Resource Block (CRB) indicated by upper-layer signaling It can be defined as starting from, and there may be one resource grid for a given antenna port, subcarrier spacing setting μ, and transmission direction (e.g., downlink, uplink, sidelink).

[0079] The base station sets the subcarrier spacing for the uplink and downlink for the terminal. carrier bandwidth and starting location It can be transmitted through upper-layer signaling (e.g., upper-layer parameters 'carrierBandwidth' and 'offsetToCarrier'). In this case, the carrier bandwidth is the subcarrier interval setting For, it is set by the upper layer parameter 'carrierBandwidth', and the starting position is the frequency offset of the subcarrier having the lowest frequency among the available resources of the carrier for Point A, is set as 'offsetToCarrier', and can be expressed as the number of RBs. At this time, and It is also possible for to be a value of the subcarrier unit. The terminal that receives the above parameters and The starting position and size of the carrier bandwidth can be determined through this. and An example of upper-layer signaling information that transmits is as follows.

[0080] <Top-level signaling information element SCS-SpecificCarrier>

[0081]

[0082] Here, Point A is a value that provides a common reference point for the resource block grid. For PCell downlinks, the terminal obtains Point A through the upper layer parameter 'offsetToPointA', and for all other cases, it obtains Point A through the absolute Radio Frequency Channel Number (ARFCN) set by the upper layer parameter 'absoluteFrequencyPointA'. Here, 'offsetToPointA' is the frequency offset between Point A and the lowest subcarrier of the lowest frequency RB among the RBs that overlap with the SS / PBCH (Synchronization Signal / Physical Broadcast Channel) selected or used by the terminal during the initial cell selection process, and is expressed in RB units.

[0083] The number or index of a Common Resource Block (CRB) increases by 1 starting from 0 in the direction of increasing value in the frequency domain. At this time, the subcarrier spacing For , the center of subcarrier index 0 of the common resource block coincides with Point A. Frequency domain common resource block index ( ) and subcarrier spacing The RE of It has the relationship. Here, k is a value defined relatively with respect to Point A. That is, k=0 is Point A.

[0084] Subcarrier spacing The Physical Resource Block (PRB) of within the Bandwidth Part (BWP) starts from 0 It is defined as a number or index up to. Here is the number or index of the bandwidth part. Bandwidth part PRB inside ( ) and CRB( The relationship between ) It is the same as. Here, is the bandwidth part from CRB 0 It is the number of CRBs up to the first RB that starts.

[0085] <bwp>

[0086] Next, the bandwidth part settings in the 5G communication system will be explained in detail with reference to the drawings.

[0087] Figure 7 is a diagram illustrating an example of the settings for the bandwidth part and the in-cell protection section in a 5G communication system.

[0088] Referring to FIG. 7, multiple bandwidth parts, namely Bandwidth Part #1 (BWP#1) (710), Bandwidth Part #2 (BWP#2) (750), and Bandwidth Part #3 (BWP#3) (790), may be set within the carrier bandwidth or terminal bandwidth (UE bandwidth) (700). Bandwidth Part #3 (790) occupies the entire UE bandwidth (700). Bandwidth Part #1 (710) and Bandwidth Part #2 (750) may each occupy the lower half and the upper half of the UE bandwidth (700).

[0089] The base station may configure one or more bandwidth parts within the uplink or downlink for the terminal, and for each bandwidth part, one or more of the following upper-layer parameters may be configured. In this case, the configuration regarding the bandwidth part may be independent of the uplink and downlink.

[0090] <An example of a top-level signaling information element BWP>

[0091]

[0092] Here, 'bwp-Id' represents a bandwidth part identifier, 'locationAndBandwidth' indicates the frequency domain location and bandwidth of the bandwidth part, 'subcarrierSpacing' indicates the subcarrier spacing used in the bandwidth part, and 'cyclicPrefix' indicates whether an extended cyclic prefix (CP) or a normal CP is used within the bandwidth part.

[0093] In addition to the above parameters, various parameters related to the bandwidth part may be configured for the terminal. These parameters may be transmitted from the base station to the terminal via upper-layer signaling, for example, RRC signaling. Within a given time, at least one of the configured bandwidth parts may be activated. The activation instruction for the configured bandwidth part may be transmitted semi-statically from the base station to the terminal via RRC signaling, or dynamically via Downlink Control Information (DCI) used for scheduling the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH).

[0094] According to one embodiment, prior to RRC connection, a terminal may receive an Initial Bandwidth Part (Initial BWP) for initial access from a base station via a Master Information Block (MIB). More specifically, during the initial access phase, the terminal may receive configuration information regarding a Control Resource Set (CORESET) and a Search Space through the MIB, where a Physical Downlink Control Channel (PDCCH) can be transmitted. At this time, the Control Resource Set and Search Space configured by the MIB may each be considered as Identity (ID) 0. The base station may notify the terminal via the MIB of at least one of frequency allocation information, time allocation information, and numerology regarding Control Resource Set #0. Here, numerology may include at least one of a subcarrier interval and a CP. Here, CP may mean at least one of the length of the CP or information corresponding to the CP length (e.g., normal or extended).

[0095] In addition, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and occasion for Control Resource Set #0, i.e., configuration information regarding Search Space #0. The terminal may regard the frequency domain configured as Control Resource Set #0 obtained from the MIB as the Initial Bandwidth Part for initial access. In this case, the identifier (ID) of the Initial Bandwidth Part may be considered as 0.

[0096] The settings for the bandwidth part supported by the aforementioned 5G can be used for various purposes.

[0097] According to one embodiment, if the bandwidth supported by the terminal is smaller than the system bandwidth, data transmission and reception by the terminal for the system bandwidth can be supported through a bandwidth part setting. For example, a base station may set the frequency domain position of the bandwidth part to the terminal so that the terminal transmits and receives data at a specific frequency position within the system bandwidth.

[0098] According to one embodiment, a base station may set multiple bandwidth parts for a terminal for the purpose of supporting different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier interval and a 30 kHz subcarrier interval for a terminal, the base station may set two bandwidth parts to subcarrier intervals of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when data transmission and reception is to be performed at a specific subcarrier interval, the bandwidth part set to the specific subcarrier interval may be activated.

[0099] According to one embodiment, for the purpose of reducing power consumption of the terminal, a base station may set a bandwidth part having a bandwidth of a different size for the terminal. For example, although the terminal supports a very large bandwidth, such as 100 MHz, if data is always transmitted and received using said bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, performing monitoring of an unnecessary downlink control channel using a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a bandwidth part with a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth part, and when data is generated, it can transmit and receive data in the 100 MHz bandwidth part according to the instructions of the base station.

[0100] As previously explained, terminals prior to RRC connection can receive configuration information regarding the initial bandwidth part through the MIB during the initial connection phase. More specifically, the terminal can receive a control resource set (CORESET) for the PDCCH from the MIB of the PBCH. The bandwidth of the control resource set configured by the MIB can be considered as the initial downlink bandwidth part, and through the initial bandwidth part, the terminal can receive the PDSCH (Physical Downlink Shared Channel) through which the SIB is transmitted. Specifically, the terminal detects the PDCCH in the search space and the control resource set within the initial bandwidth part configured by the MIB, receives the remaining system information (RMSI) or SIB1 (System Information Block 1) required for the initial connection through the PDSCH scheduled by the PDCCH, and obtains configuration information regarding the uplink initial bandwidth part through the SIB1 (or RMSI). In addition to receiving SIBs, the initial bandwidth part may also be used for other system information (OSI), paging, and random access.

[0101] If one or more bandwidth parts are configured for the terminal, the base station may instruct the terminal to change the bandwidth part using the Bandwidth part indicator field within the DCI.

[0102] For example, in FIG. 7, if the currently active bandwidth part of the terminal is bandwidth part #1 (710), the base station may indicate bandwidth part #2 (750) to the terminal using a bandwidth part indicator within the DCI, and the terminal may perform a bandwidth part change to the indicated bandwidth part #2 (750) based on the received bandwidth part indicator within the DCI.

[0103] As described above, since DCI-based bandwidth part changes can be directed by a DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit the PDSCH or PUSCH scheduled by the DCI in the changed bandwidth part without difficulty. To this end, the standard specifies the delay time (T) required when changing a bandwidth part. BWP The requirements for ) have been specified and can be defined, for example, as shown in below.

[0104] NR Slot length (ms) BWP switch delay T BWP (slots) Type 1 Note 1 Type 2 Note 1 0 1 1 3 1 0.5 2 5 2 0.25 3 9 3 0.125 6 17 Note 1: Depends on UE capability.Note 2: If the BWP switch involves changing of SCS, the BWP switch delay is determined by the larger one between the SCS before BWP switch and the SCS after BWP switch.

[0105] The requirements for bandwidth part change delay time support Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth part delay time type to the base station.

[0106] In accordance with the aforementioned requirements for the bandwidth part change delay time, if the terminal receives a DCI containing a bandwidth part change indicator in slot n, the terminal performs a change to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T BWP Completion can be performed at a time no later than that, and transmission and reception for the data channel scheduled by the DCI can be performed in the changed new bandwidth part. When the base station intends to schedule a data channel in the new bandwidth part, the terminal's bandwidth part change delay time (T BWP By considering ), the time domain resource allocation for the data channel can be determined. That is, when the base station schedules a data channel with a new bandwidth part, in the method for determining the time domain resource allocation for the data channel, the data channel can be scheduled after the bandwidth part change delay time. Accordingly, the terminal [is instructed] by the DCI indicating the bandwidth part change, the bandwidth part change delay time (T BWP You may not expect to indicate a slot offset (K0 or K2) smaller than )

[0107] If a terminal receives a DCI (e.g., DCI format 1_1 or 0_1) instructing a change in the bandwidth part, the terminal may not perform any transmission or reception during a time interval corresponding to from the third symbol of the slot in which the PDCCH containing the DCI was received to the start symbol of the slot instructed by the slot offset (K0 or K2) instructed by the time domain resource allocation field within the DCI. For example, if a terminal receives a DCI instructing a change in the bandwidth part in slot n, and the slot offset instructed by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0109] <Intra-cell guard-band>

[0110] The terminal may receive an in-cell guard band setting for one or more cells (or carriers). In this case, the in-cell guard band setting may be for a downlink guard band and an uplink guard band, respectively. FIG. 7 shows an example in which a carrier bandwidth or terminal bandwidth (UE bandwidth) (700) is set to multiple in-cell guard bands, namely, in-cell guard band #1 (740), in-cell guard band #2 (745), and in-cell guard band #3 (780). More specifically, the terminal may receive an in-cell or carrier band through an upper-layer signaling 'IntraCellGuardBand-r16', which can be configured as an example as follows. Each uplink / downlink cell can have a protection interval set. Here, x=DL or UL.

[0111] <Top-level signaling information element IntraCellGuardBand-r16>

[0112]

[0113] Here, 'startCRB' is the starting CRB index of the protection interval within the cell. And, 'nrofCRBs' is the length of the protection interval within the cell and can be expressed as the number of CRBs (N) or PRBs (N). In this case, 'nrofCRBs' is the last CRB index of the protection interval within the cell. It may be a value referring to. In other words, the above 'GuardBand' may include one or more (startCRB, nrofCRBs) values, and the first value among each of the two values ​​is the lowest CRB index of the protection interval within the cell. and the second value is the highest CRB index of the protection interval within the cell. It can mean. In this case, It is also possible to determine as such. Here, it is also possible for the above CRB index to be expressed as a PRB index. The terminal uses the number of (startCRB, nrofCRBs) pairs included in the 'GuardBand' or the sequence length of the 'GuardBand' (e.g., sequence length / 2) to determine the number of in-cell protection intervals set by the base station ( It can also be determined. At this time, the terminal may be configured to have no uplink / downlink cell guard band within the cell or carrier band, or to have a guard band of 0, through 'IntraCellGuardBand-r16'. For example, if at least 'startCRB-r16' has a negative value such as -1 or has a number other than an integer, the terminal may determine through the above configuration that there is no uplink / downlink cell guard band within the cell or carrier band.

[0114] As described above, a terminal that has been configured with an in-cell protection interval, the resource area excluding the in-cell protection interval from the carrier wave or the configured bandwidth part It can be divided into resource sets (e.g., RB-sets) or resource regions containing RBs, and uplink / downlink transmission and reception can be performed using the resources included in the resource set. At this time, the resource region of each resource set can be determined as follows.

[0115] - Starting CRB index of the first resource set (resource set index 0):

[0116] - Last resource set (resource set index The last CRB index of )

[0117] - Starting CRB index of resource sets other than the above:

[0118] - Termination CRB index of resource sets other than the above:

[0119] Here And, and is the subcarrier interval setting Accordingly, the first available RB and bandwidth of the above carrier can be set through upper layer signaling.

[0120] In FIG. 7, the carrier bandwidth or terminal bandwidth (UE bandwidth) (700) consists of three in-cell guard intervals and four resource sets. , that is, shows an example of being set to resource set #1 (720), resource set #2 (730), resource set #3 (760), and resource set #4 (770).

[0121] The terminal can perform uplink and downlink transmission and reception using resources included in a resource set and an in-cell protection interval. For example, if uplink and downlink transmission and reception resources configured or scheduled by the base station are allocated within two consecutive resource sets, the terminal can perform uplink and downlink transmission and reception using an in-cell protection interval included between said resource sets.

[0122] If the terminal has not received an intra-cell guard band setting via the upper-layer signaling 'intraCellGuardBandx' (where x = DL or UL), the terminal can determine the intra-cell guard band and resource area of ​​the resource set using the intra-cell guard band predefined with the base station. In this case, the intra-cell guard band may be predefined based on the subcarrier spacing and the size of the carrier or bandwidth part. Additionally, the intra-cell guard band may be predefined independently for the downlink and uplink, or the downlink and uplink intra-cell guard bands may be the same. Here, the fact that the intra-cell guard band is predefined means that for each intra-cell guard band, the starting CRB index of the intra-cell guard band , last CRB index of the protection interval within the cell or the lowest CRB index of the protection interval within the cell or the highest CRB index of the protection interval within the cell This can mean that it is predefined.

[0123] According to one embodiment, an example in which a terminal receives at least one uplink / downlink guard section within a specific cell or carrier is as follows. In the case of a cell that performs communication through an unlicensed band, the base station may set one or more guard sections within a bandwidth or bandwidth part depending on the channel size of the unlicensed band. For example, an unlicensed band in the 5 GHz band is composed of multiple channels of 20 MHz, and a guard section may exist between each channel. Therefore, if the base station and the terminal intend to perform communication through a bandwidth or bandwidth part larger than 20 MHz, one or more guard sections may be set within the bandwidth or bandwidth part.

[0124] For example, in a base station and a terminal communicating through an unlicensed band with a channel size of 20 MHz, if the size of at least one of the bandwidth parts (710, 750, 790) set by the terminal from the base station is greater than 20 MHz, the terminal may be set to have one or more in-cell protection intervals set, and according to the setting of the in-cell protection intervals, each bandwidth part may be set to consist of multiple resource sets having a size of 20 MHz. For example, the terminal may be set to have two resource sets #1 (720) and resource set #2 (730) and one in-cell protection interval #1 (740) set for bandwidth part #1 (710) of FIG. 7. The base station and the terminal may perform a channel access procedure (or Listen-before-talk (LBT)) for each resource set and perform uplink / downlink transmission and reception using the resource set that successfully accessed the channel. At this time, if the channel connection procedure is successful in both consecutive resource sets (e.g., resource set #1 (720) and resource set #2 (730)), the resources within cell protection interval #1 (740) included between said resource sets may also be used for uplink / downlink transmission and reception. If the channel connection procedure fails in at least one of the two consecutive resource sets (e.g., resource set #1 (720) and resource set #2 (730)), the resources within cell protection interval #1 (740) included between said resource sets cannot be used for uplink / downlink transmission and reception.

[0125] <SS / PBCH block>

[0126] Next, the SS / PBCH block in 5G is explained as follows.

[0127] An SS / PBCH block may refer to a physical layer channel block composed of PSS (Primary SS), SSS (Secondary SS), and PBCH. Specifically, it is as follows.

[0128] - PSS: A signal that serves as the reference for downlink time / frequency synchronization and provides some information about the cell ID.

[0129] - SSS: Serves as the reference for downlink time / frequency synchronization and provides the remaining cell ID information not provided by PSS. Additionally, it can serve as a Reference Signal (RS) for PBCH demodulation.

[0130] - PBCH: Provides essential system information required for the transmission and reception of the terminal's data and control channels. The essential system information may include search space-related control information representing wireless resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, etc.

[0131] - SS / PBCH block: An SS / PBCH block is composed of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks may be transmitted within a time of 5ms, and each transmitted SS / PBCH block may be distinguished by an index.

[0132] The terminal can detect PSS and SSS during the initial connection phase and can decode PBCH. It can obtain MIB from PBCH and receive a setting for Control Resource Set #0 (which may correspond to a Control Resource Set with a Control Resource Set index of 0). The terminal can perform monitoring of Control Resource Set #0 by assuming that the selected SS / PBCH block (or the SS / PBCH block successfully decoded by PBCH) and the DMRS (Demodulation Reference signal) transmitted from Control Resource Set #0 are in Quasi-Co Location (QCL). The terminal can obtain system information through downlink control information transmitted from Control Resource Set #0. From the acquired system information, the terminal can obtain RACH (Random Access Channel) related setting information required for initial connection. The terminal can transmit PRACH (Physical RACH) to the base station considering the selected SS / PBCH block index, and the base station receiving the PRACH can obtain the SS / PBCH block index selected by the terminal. The base station can know which block the terminal has selected among the respective SS / PBCH blocks and is monitoring the control resource set #0 associated with it.

[0133] <dci>

[0134] Next, the downlink control information (DCI) in the 5G system is explained in detail as follows.

[0135] In a 5G system, scheduling information for uplink data (or PUSCH) or downlink data (or PDSCH) is transmitted from the base station to the terminal via DCI. The terminal may attempt to monitor or detect at least one of a fallback DCI format and a non-fallback DCI format for the PUSCH or PDSCH. The fallback DCI format may consist of fields predefined between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0136] DCI can be transmitted via the PDCCH, a physical downlink control channel, after undergoing channel coding and modulation processes. A Cyclic Redundancy Check (CRC) is attached to the payload of the DCI, and the CRC can be scrambled into a Radio Network Temporary Identifier (RNTI) corresponding to the terminal's identity. Different RNTIs may be used depending on the purpose of the DCI, such as UE-specific data transmission, power control commands, or random access responses. That is, the RNTI is not explicitly transmitted but is included in the CRC calculation process. Upon receiving a DCI transmitted over the PDCCH, the terminal checks the CRC using the assigned RNTI, and if the result of the CRC check is correct, the terminal knows that the DCI was transmitted to it.

[0137] For example, a DCI scheduling a PDSCH for System Information (SI) can be scrambled to SI-RNTI. A DCI scheduling a PDSCH for Random Access Response (RAR) messages can be scrambled to RA-RNTI. A DCI scheduling a PDSCH for Paging messages can be scrambled to P-RNTI. A DCI notifying a Slot Format Indicator (SFI) can be scrambled to SFI-RNTI. A DCI notifying Transmit Power Control (TPC) can be scrambled to TPC-RNTI. A DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled to C-RNTI (Cell RNTI).

[0138] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, whereby the CRC can be scrambled into at least one of C-RNTI, CS-RNTI, and MCS-C-RNTI. DCI format 0_0 having a CRC scrambled into at least one RNTI among C-RNTI, CS (configured scheduling)-RNTI, and MCS (modulation coding scheme)-C-RNTI may include, for example, at least one of the following information.

[0139] - Identifier for DCI formats: An identifier for distinguishing DCI formats. For example, when a terminal receives a DCI through a 1-bit identifier, if the value of the identifier is 0, the DCI is in UL DCI format (e.g., DCI format 0_1), and if it is 1, the DCI is in DL DCI format (e.g., DCI format 1_0).

[0140] - Frequency domain resource assignment: Refers to RBs, which are frequency domain resources assigned using the resource assignment type 1 method Includes bits. Here, if the terminal monitors DCI format 0_0 in the common search space, is the size of the initial uplink bandwidth part, and when monitoring DCI format 0_0 in the terminal's unique search space, is the size of the currently active uplink bandwidth part. In other words, the bandwidth part that determines the size of the frequency domain resource allocation field may differ depending on the seek space in which the countermeasure DCI format is transmitted.

[0141] In one embodiment, when performing PUSCH hopping, Among the beats The most significant bits (MSBs) can be used to indicate the frequency offset. Here, If so, two offsets are set by upper-layer signaling, and If so, it means that four offsets are set by upper-layer signaling, and The bit indicates a frequency domain resource area allocated according to the resource allocation type 1 below.

[0142] According to one embodiment, when PUSCH hopping is not performed, Bit provides a frequency domain resource area allocated according to resource allocation type 1.

[0143] - Time domain resource assignment: 4 bits, indicating a row index of a time domain resource assignment table containing a PUSCH mapping type, a PUSCH transmission slot offset, a PUSCH start symbol, and the number of PUSCH transmission symbols. The time domain resource assignment table may be configured by upper layer signaling or pre-configured between the base station and the terminal.

[0144] - Frequency hopping flag: 1 bit, indicating whether to enable or disable PUSCH hopping.

[0145] - Modulation and coding scheme (MCS): Indicates the modulation and coding scheme used for data transmission.

[0146] - New Data Indicator (NDI): Indicates whether it is an initial HARQ transmission or a retransmission.

[0147] - Redundancy version (RV): Indicates the redundancy version of HARQ.

[0148] - HARQ process number: Indicates the HARQ process number.

[0149] - TPC command: Instructs the transmit power control command for the scheduled PUSCH.

[0150] - Padding bit: A field used to match the size (total number of bits) with other DCI formats (e.g., DCI format 1_0), and is inserted as 0 if necessary.

[0151] - UL / SUL indicator: 1 bit. If the cell has two or more ULs and the size of DCI format 1_0 before padding bits is larger than the size of DCI format 0_0 before padding bits, it has a 1-bit UL / SUL indicator; otherwise, the UL / SUL indicator does not exist or is 0 bits. If the UL / SUL indicator exists, the UL / SUL indicator is located at the last bit of DCI format 0_0 after the padding bits.

[0152] - ChannelAccess-CPext: 2 bits, indicating the channel access type and CP extension for cells operating in the unlicensed band. For cells operating in the licensed band, it is absent or 0 bits.

[0153] For DCI formats other than DCI format 0_0, refer to the 3GPP standardization document.

[0154] <time domain resource allocation>

[0155] The following describes the time domain resource allocation for data channels in a 5G communication system.

[0156] The base station may set a table for time domain resource allocation for downlink data channels (PDSCH) and uplink data channels (PUSCH) to the terminal as upper layer signaling (e.g., RRC signaling), or use a table for time domain resource allocation predefined between the base station and the terminal as shown in .

[0157] For example, in the case of fallback DCI, the terminal uses a predefined table as shown in , and in the case of non-fallback DCI, the terminal can use a table set through upper layer signaling.

[0158] Row index PUSCH mapping type K2 S L 1 Type A j 0 14 2 Type A j 0 12 3 Type A j 0 10 4 Type B j 2 10 5 Type B j 4 10 6 Type B j 4 8 7 Type B j 4 6 8 Type A j+1 0 14 9 Type A j+1 0 12 10 Type A j+1 0 10 11 Type A j+2 0 14 12 Type A j+2 0 12 13 Type A j+2 0 10 14 Type B j 8 6 15 Type A j+3 0 14 16 Type A j+3 0 10

[0159] At this time, for time domain resource allocation established through upper-layer signaling, a table consisting of a maximum of maxNrofDL-Allocations = 16 entries may be established for PDSCH, and a table consisting of a maximum of maxNrofUL-Allocations = 16 entries may be established for PUSCH. Each of the above tables may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), the position (S) and length (L) of the starting symbol where PDSCH or PUSCH is scheduled within the slot, and the mapping type of PDSCH or PUSCH.

[0160] When upper-layer signaling is used, for example, information elements such as the following may be notified from the base station to the terminal.

[0161] <PDSCH-TimeDomainResourceAllocationList information element>

[0162]

[0163] <PUSCH-TimeDomainResourceAllocation information element>

[0164]

[0165] Here, 'k0' indicates the PDCCH-to-PDSCH timing as a slot-unit offset, 'k2' indicates the PDCCH-to-PUSCH timing as a slot-unit offset, 'mappingType' indicates the mapping type of PDSCH or PUSCH, and 'startSymbolAndLength' indicates the starting symbol and length of PDSCH or PUSCH.

[0166] The base station may notify the terminal of one of the entries in the time domain resource allocation table via L1 signaling. For example, it may indicate the 'time domain resource allocation' field within the DCI. The terminal may obtain a time domain resource allocation for PDSCH or PUSCH based on the field within the DCI received from the base station.

[0167] <Frequency domain resource allocation>

[0168] The following describes the allocation of frequency domain resources for data channels in a 5G communication system.

[0169] Two types, namely resource allocation type 0 and resource allocation type 1, are supported as a method for directing frequency domain resource allocation for downlink data channel (PDSCH) and uplink data channel (PUSCH).

[0170] Resource allocation type 0 is a method of allocating resources in units of a Resource Block Group (RBG) composed of P consecutive RBs, and can be notified from the base station to the terminal in the form of a bitmap. At this time, the RBG can be composed of a set of consecutive Virtual Blocks (VRBs), and the size of the RBG P (Nominal RBG size P) can be determined based on the value set by the upper layer parameter rbg-Size' and the size value of the bandwidth part defined in below.

[0171] Bandwidth Part Size Configuration 1 Configuration 2 1 - 36 2 4 37 - 72 4 8 73 - 144 8 16 145 - 275 16 16

[0172] The size here is Total number of RGBs in bandwidth part i Is is. Here, the size of the first RBG is is. The size of the last RBG is if In the case of, and, in cases where that is not the case Is is. The size of RGB other than the above is am. Each bit of a bitmap of bit size can correspond to a respective RGB. The RGBs can be indexed in increasing order of frequency, starting from the lowest frequency position in the bandwidth part. Within the bandwidth part For the RBGs, from RBG#0 to RBG#( -1) This RGB bitmap can be mapped from MSB to LSB. The terminal can determine that the RGB corresponding to the bit value is assigned when a specific bit value in the bitmap is 1, and can determine that the RGB corresponding to the bit value is not assigned when a specific bit value in the bitmap is 0.

[0173] Resource Allocation Type 1 is a method of allocating resources based on the starting position and length of contiguously allocated VRBs, wherein interleaving or non-interleaving may additionally be applied to the contiguously allocated VRBs. The resource allocation field of Resource Allocation Type 1 may consist of a Resource Indication Value (RIV), and the RIV is the starting point of the VRB ( ) and the length of contiguously allocated RB ( It can be composed of ). is the first PRB index where resource allocation begins, and can be the allocated consecutive PRB length or number. More specifically, The RIV within the bandwidth part of the size can be defined as follows.

[0174]

[0175]

[0176]

[0177] At this time, depending on the search space where the countermeasure DCI format (e.g., DCI format 0_0 or DCI format 1_0) is transmitted It may differ. For example, when DCI format 0_0, a countermeasure DCI format among DCIs that establish or schedule uplink transmissions (i.e., Uplink Grants (UL grants)), is transmitted in the common search space (CSS), The initial uplink bandwidth part size, or This may be used. Similarly, when DCI format 1_0, a countermeasure DCI format among DCIs that establish or schedule downlink reception, is transmitted in the common search space (CSS), and or If control resource set #0 is set in the cell, it becomes the size of control resource set #0, and if control resource set #0 is not set, it becomes the size of the initial downlink bandwidth part.

[0178] At this time, when the countermeasure DCI format, DCI format 0_0 or DCI format 1_0, is transmitted in the UE-specific search space (USS), or when the size of the countermeasure DCI format transmitted in the UE-specific search space is determined through the size of the initial uplink bandwidth part or the initial downlink bandwidth part, the above DCI When applied to different active bandwidth parts of different sizes, RIV is and It corresponds to, and RIV is defined as follows.

[0179]

[0180]

[0181]

[0182] At this time, if If so, K is a set middle It is the largest value satisfying . Otherwise ( ), is 1.

[0183] The base station can set the resource allocation type to the terminal through upper layer signaling. For example, the upper layer parameter resourceAllocation can be set to one of resourceAllocationType0, resourceAllocationType1, or dynamicSwitch. If the terminal is set to both resource allocation types 0 and 1, or if the upper layer parameter resourceAllocation is set to dynamicSwitch, the MSB (Most Significant Bit) of the resource allocation field in the DCI format that directs scheduling can indicate whether it is resource allocation type 0 or resource allocation type 1, and based on the indicated resource allocation type, resource allocation information can be indicated through the remaining bits excluding the MSB of the resource allocation field, and the terminal can interpret the resource allocation information of the DCI based on this. If the terminal is set to either resource allocation type 0 or resource allocation type 1, or if the upper layer parameter resourceAllocation is set to either resourceAllocationType0 or resourceAllocationType1, the resource allocation field within the DCI format that directs scheduling may indicate resource allocation information based on the set resource allocation type, and the terminal may interpret the resource allocation information of the DCI based on the set resource allocation type.

[0184] <coreset>

[0185] In the following, the downlink control channel in a 5G communication system is explained in more detail with reference to the drawings.

[0186] FIG. 8 is a diagram illustrating an example of a control resource set setting for a downlink control channel of a 5G communication system. That is, FIG. 8 is a diagram illustrating an example of a control resource set (CORESET) transmitted by a downlink control channel in a 5G wireless communication system.

[0187] Referring to FIG. 8, two control resource sets, namely Control Resource Set #1 (801) and Control Resource Set #2 (802), are set within a terminal bandwidth part (UE bandwidth part) (810) in the frequency domain and one slot (820) in the time domain. The control resource sets (801, 802) are set within a specific frequency resource (803) within the terminal bandwidth part (810) in the frequency domain, and can be set with one or more OFDM symbols in the time domain. The OFDM symbols can be defined by a Control Resource Set Duration (804). Referring to the illustrated example, Control Resource Set #1 (801) is set to a Control Resource Set Duration of 2 symbols, and Control Resource Set #2 (802) is set to a Control Resource Set Duration of 1 symbol.

[0188] Each of the aforementioned control resource sets may be configured by a base station to a terminal via at least one of upper-layer signaling, such as System Information, Master Information Block (MIB), or Radio Resource Control (RRC) signaling. Configuring a control resource set to a terminal means providing information such as a control resource set identifier, the frequency location of the control resource set, and the symbol length of the control resource set. For example, the upper-layer signaling information element or control resource set configuration information for configuring the control resource set may include the following information.

[0189] <ControlResourceSet information element>

[0190]

[0191] Here, 'controlResourceSetId' indicates the control resource set identifier, 'frequencyDomainResources' indicates frequency domain resources, 'duration' indicates the time interval of the control resource set, i.e., the time domain resources, 'cce-REG-MappingType' indicates the CCE-to-REG mapping method, 'reg-BundleSize' indicates the REG bundle size, 'interleaverSize' indicates the interleaver size, and 'shiftIndex' indicates the interleaver shift.

[0192] Additionally, tci-StatesPDCCH may include one or more SS / PBCH block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with DMRS transmitted from the corresponding control resource set, as configuration information for TCI (Transmission Configuration Indication) states.

[0193] FIG. 9 is a diagram illustrating the structure of a downlink control channel of a 5G communication system. That is, FIG. 9 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in a 5G wireless communication system.

[0194] Referring to FIG. 9, the basic unit of time and frequency resources constituting a downlink control channel can be a REG (Resource Element Group, 903), and the REG (903) can be defined as 1 OFDM symbol (901) in the time domain and 1 PRB (902) in the frequency domain, i.e., 12 subcarriers. A base station can concatenate at least one REG (903) to form an allocation unit of the downlink control channel.

[0195] In 5G, if the basic unit to which a downlink control channel is allocated is called a Control Channel Element (CCE) (904), then 1 CCE (904) can be composed of multiple REGs (903). To explain the example of the illustrated REG (903), the REG (903) can be composed of 12 REs, and if 1 CCE (904) is composed of 6 REGs (903), then 1 CCE (904) can be composed of 72 REs. The area where a downlink control resource set is configured can be composed of multiple CCEs (904), and a specific downlink control channel can be mapped to one or multiple CCEs (904) according to the Aggregation Level (AL) within the control resource set. The CCEs (904) within the control resource set are distinguished by numbers, and the numbers of the CCEs (904) can be assigned according to a logical mapping method.

[0196] The basic unit of a downlink control channel, namely a REG (903), may include both a region of REs to which the DCI is mapped and a region to which the DMRS (905) used to demodulate the DCI is mapped. Within one REG (903), at least one (three in the illustrated example) DMRS (905) may be transmitted. The number of CCEs required to transmit a downlink control channel may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. A terminal must detect a signal within a set of control resources without knowing the existence of the downlink control channel, and a search space representing a set of CCEs may be defined for this blind decoding. A search space is a set of downlink control channel candidates consisting of CCEs that a terminal must attempt to decode on a given aggregation level, and since there are various aggregation levels that form a group of 1, 2, 4, 8, or 16 CCEs, a terminal may have multiple search spaces. A search space set can be defined as a set of search spaces on all configured aggregation levels.

[0197] <Search Space>

[0198] The search space for PDCCH can be classified into a Common Search Space (CSS) and a Terminal-Specific Search Space (USS). A certain group of terminals or all terminals may search the Common Search Space to receive cell-common control information, such as dynamic scheduling for system information or paging messages. For example, scheduling allocation information for PDSCH for the transmission of SIBs containing cell operator information can be detected by searching the Common Search Space. The Common Search Space can be defined as a set of pre-agreed CCEs that allow a certain group of terminals or all terminals to receive PDCCH. Scheduling allocation information for Terminal-Specific PDSCH or PUSCH can be detected by searching the Terminal-Specific Search Space. The Terminal-Specific Search Space can be defined specifically as a function of the terminal's identity and various system parameters.

[0199] In a 5G wireless communication system, parameters for the search space of a PDCCH can be configured from the base station to the terminal via upper-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may configure the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the index of the control resource set to be monitored in the search space. For example, an upper-layer signaling information element that configures the parameters for the search space of a PDCCH may include the following configuration information.

[0200] <SearchSpace information element>

[0201]

[0202] Here, 'searchSpaceId' indicates the search space identifier, 'controlResourceSetId' indicates the control resource set identifier, 'monitoringSlotPeriodicityAndOffset' indicates the monitoring slot level period, 'duration' indicates the length of the time interval to be monitored, 'monitoringSymbolsWithinSlot' indicates the symbols for PDCCH monitoring within the slot, 'nrofCandidates' indicates the number of PDCCH candidates per aggregation level, 'searchSpaceType' indicates the search space type, 'common' includes parameters for the common search space, and 'ue-Specific' includes parameters for the terminal-specific search space.

[0203] According to the above configuration information, the base station may set one or multiple search space sets for the terminal. According to one embodiment, the base station may set search space set 1 and search space set 2 for the terminal, may set DCI format A scrambled with X-RNTI in search space set 1 to be monitored in a common search space, and may set DCI format B scrambled with Y-RNTI in search space set 2 to be monitored in a terminal-specific search space.

[0204] According to the above configuration information, one or more sets of search spaces may exist in a common search space or a terminal-specific search space. For example, Search Space Set #1 and Search Space Set #2 may be configured as a common search space, and Search Space Set #3 and Search Space Set #4 may be configured as a terminal-specific search space.

[0205] In the common search space, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0206] - 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

[0207] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0208] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0209] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0210] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0212] In terminal-specific search spaces, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the following examples.

[0213] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0214] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0216] The specified RNTIs may follow the definitions and uses below.

[0217] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH scheduling

[0218] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0219] CS-RNTI (Configured Scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0220] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase

[0221] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0222] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0223] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0224] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0225] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0226] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power control commands for the SRS (Sounding Reference Signal).

[0227] The aforementioned DCI formats may follow the definitions in below.

[0228] DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1 Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1 Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slot format 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE 2_2 Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0229] In 5G communication systems such as NR, physical channels and physical signals can be distinguished as follows. For example, uplink / downlink physical channels refer to a set of REs that transmit information sent through the upper layer, and typical examples include PDCCH, PUCCH, PDSCH, and PUSCH. Uplink / downlink physical signals refer to signals used at the physical layer that do not transmit information sent through the upper layer, and typical examples include DM-RS, CSI-RS, and SRS.

[0230] In the present disclosure, physical channels and physical signals may be described as signals without distinction as described above. For example, the expression that a base station transmits a downlink signal may mean that the base station transmits at least one of a downlink physical channel and a downlink physical signal, such as PDCCH, PDSCH, DM-RS, or CSI-RS. In other words, the term "signal" in the present disclosure includes both the above-mentioned channels and signals, and may be distinguished according to the context and circumstances if such distinction is actually necessary.

[0231] <TCI state>

[0232] The following describes in detail how to set the TCI state for the PDCCH (or PDCCH DMRS) in a 5G communication system.

[0233] The TCI state is intended to announce the Quasi-Colocation (QCL) relationship between a PDCCH (or PDCCH DMRS) and other RS ​​(Reference Signal) or channels. Here, when it is said that antenna port A of a reference signal (reference RS #A) and antenna port B of a target reference signal (target RS #B) are QCLed with each other, it means that the terminal is permitted to apply some or all of the channel-related parameters estimated from antenna port A to channel measurements from antenna port B. QCL-related parameters may include at least one of 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters, and depending on the situation, different parameters may need to be associated. NR can support four types of QCL relationships, as shown in below, as an example.

[0234] QCL type Large-scale characteristics A Doppler shift, Doppler spread, average delay, delay spread B Doppler shift, Doppler spread C Doppler shift, average delay D Spatial Rx parameter

[0235] Here, the spatial RX parameter can collectively refer to some or all of various parameters, such as Angle of Arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of Departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0236] The above QCL relationship can be configured for the terminal through RRC signaling parameters, namely TCI-State and QCL-Info, as follows. Referring to the configuration information below, the base station can configure one or more TCI states for the terminal and provide up to two QCL relationships (qcl-Type1, qcl-Type2) for the RS referencing the ID of the said TCI state, i.e., the target RS. Here, providing up to two QCL relationships is merely an example, and the base station may provide the terminal with two or more QCL relationships for the said target RS. In this case, each QCL information (QCL-Info) included in each said TCI state includes the serving cell index and BWP index of the reference RS pointed to by the corresponding QCL information, the type and ID of the reference RS, and the following QCL type.

[0237] <TCI-State information element>

[0238]

[0239] Here, 'tci-StateId' indicates the TCI state ID, 'qcl-Type1' contains the QCL information of the first target RS referencing the TCI state ID, and 'qcl-Type2' contains the QCL information of the second target RS referencing the TCI state ID. For each QCL information, 'cell' indicates the serving cell index of the terminal configured with the RS pointed to by the QCL information, 'bwp-Id' indicates the BWP index of the RS pointed to by the QCL information, and 'csi-rs' or 'ssb' indicates the CSI-RS ID or SSB (synchronization signal / sequence block) ID pointed to by the QCL information.

[0240] A base station can communicate with a terminal using one or multiple beams. To this end, the base station can transmit information regarding N different beams to the terminal through N different TCI states. For example, when N=3, the base station can notify the terminal that antenna ports referencing the different TCI states are associated with different spatial Rx parameters, i.e., different beams, by ensuring that the qcl-Type parameters (e.g., qcl-Type2) included in the three TCI states are associated with CSI-RS or SSB corresponding to different beams and are set to QCL type D. Specifically, an example of a TCI state combination applicable to a PDCCH DMRS antenna port is shown in Table 7 below. In Table 7, the fourth row represents the combination assumed by the terminal prior to RRC setup, and this row is not settable for the terminal after RRC setup.

[0241] Valid TCIstate Configuration DL RS 1 qcl-Type1 DL RS 2(if configured) qcl-Type2(if configured) 1 TRS QCL-TypeA TRS QCL-TypeD 2 TRS QCL-TypeA CSI-RS (BM) QCL-TypeD 3 CSI-RS (CSI) QCL-TypeA 4 SS / PBCH Block QCL-TypeA SS / PBCH Block QCL-TypeD

[0242] The base station supports hierarchical signaling for dynamic TCI state allocation for the PDCCH beam to the terminal. Specifically, the base station can set N TCI states (TCI#0, TCI#1, ..., TCI#M-1) to the terminal via RRC signaling, and can set some of these as TCI states for CORESET. Subsequently, the base station can instruct and activate one of the TCI states for CORESET to the terminal via MAC CE signaling (e.g., a MAC CE enable command for providing the TCI state of CORESET). Upon receiving the MAC CE signaling, the terminal [transmits] from a slot (e.g., slot k) that transmits HARQ-ACK information for the PDSCH providing the MAC CE signaling Starting from the first slot after the slot, the TCI state indicated by the MAC CE signaling is applied, and a PDCCH can be received based on beam information including the TCI state. Here is the number of slots included in each subframe for the subcarrier interval μ.

[0243] At this time, the MAC CE for the TCI state indication of the PDCCH is composed of 2 bytes (16 bits) and may consist of a 5-bit serving cell ID field, a 4-bit CORESET ID field, and a 7-bit TCI state ID field. The serving cell ID field indicates the ID of the serving cell to which the MAC CE is applied, and the CORESET ID field may indicate the ID of the CORESET to which the TCI state of the MAC CE is indicated or applied. The TCI state ID field may indicate the TCI state applied to the CORESET identified through the CORESET ID field. If the CORESET ID is 0, the TCI state ID field may indicate one of the first 64 TCI states among the TCI states set through 'tci-States-ToAddModList' and 'tci-States-ToReleaseList' in 'PDSCH-Config', which is the upper layer signaling for the active bandwidth part. If the CORESET ID is set to a value other than 0, the TCI state ID field may indicate one of the TCI-states set through the upper layer signaling for the CORESET indicated by the CORESET ID field, namely 'tci-StatesPDCCH-ToAddList' and 'tci-StatesPDCCH-ToReleaseList'.

[0244] A terminal that has received a TCI-state instruction and / or activation for a CORESET through MAC CE signaling in this manner may be considered to have the same QCL information applied to all one or more search spaces to which the CORESET is connected until another TCI-state is indicated through another MAC CE signaling thereafter.

[0245] <TCI state for Radio link monitoring (RLM)>

[0246] If the terminal has not configured or received higher-level configuration information related to RLM-RS, but the terminal includes one or more CSI-RS in the TCI states configured or received for PDCCH reception, the terminal may operate as follows.

[0247] - If the TCI-state activated for PDCCH reception contains only one RS, the terminal performs an RLM operation using the said RS.

[0248] - The terminal does not need to perform RLM using aperiodic RS or semi-persistent RS.

[0249] - if In this case, the terminal, among the RSs of the TCI-states enabled and provided for PDCCH reception, among the search spaces associated with the CORESET where the PDCCH is transmitted, in order of shortest PDCCH monitoring periodicity Selects RSs. If the search spaces for one or more CORESETs have the same PDCCH monitoring period, the terminal can determine the selection order of CORESETs in order of highest CORESET index.

[0250] A terminal configured with multiple downlink bandwidth parts for a serving cell can perform RLM using the following RS. The said RS is an RS corresponding to an RS index configured or provided via the upper-layer signaling 'RadioLinkMonitoringRS' for the activated downlink bandwidth part, or, if not configured or provided via the upper-layer signaling 'RadioLinkMonitoringRS' for the activated downlink bandwidth part, it is an RS of the TCI-state configured and activated in the CORSET for receiving PDCCH in the activated downlink bandwidth part.

[0251] <TCI state for PDCCH assignment>

[0252] A terminal provided with 0 as a navigation space ID for a C-RNTI and a type 0 / 0A / 2 PDCCH CSS set can determine the PDCCH monitoring occasion of the type 0 / 0A / 2 PDCCH CSS set as follows, and monitor PDCCH candidates during the PDCCH monitoring occasion associated with an SS / PBCH block. Here, the SS / PBCH block may be determined according to at least one of the following.

[0253] - SS / PBCH blocks in a relationship with CSI-RS and QCL included in a TCI-state indicated or activated by the MAC CE activation indicator in an activated bandwidth part containing CORESET index 0, or

[0254] - SS / PBCH blocks used in the most recent competition-based random access procedure

[0255] A terminal that has not received TCI state information indicating QCL information of the DM-RS antenna port of the PDCCH transmitted from the CORESET can assume that the DM-RS antenna port of the PDCCH transmitted from the CORESET, the DM-RS antenna port of the PDSCH scheduled through the PDCCH, and the SS / PBCH block that transmitted the MIB are all QCLed with respect to average gain, QCL-Type A, and QCL-Type D characteristics, which are configured by the configuration information transmitted through the MIB.

[0256] For a CORESET having index 0, the terminal may assume that the DM-RS antenna port of the PDCCH received from the CORESET is QCL with a downlink RS or SS / PBCH block as follows. In other words, if the TCI state is indicated or activated by a MAC CE activation command for the CORESET, the terminal may assume that one or more downlink RSs configured through the TCI state and the DM-RS antenna port of the PDCCH are QCL with each other. If the terminal has not received a MAC CE activation command indicating or activating the TCI state for the CORESET after the most recent random access procedure among random access procedures that are not contention-free random access procedures triggered by a PDCCH order, the terminal may assume that it is QCL with an SS / PBCH block identified by the terminal during the most recent random access procedure.

[0257] For other CORESETs excluding the CORESET having index 0, if the terminal has not received configuration information for the TCI state through the CORESET configuration information as described above, or has received initial configuration of multiple TCI states but has not received a MAC CE activation command indicating or activating one TCI state for the CORESET, the terminal may assume that the DM-RS antenna port of the PDCCH received from the CORESET and the SS / PBCH block identified in the initial access procedure are QCL.

[0258] For CORESETs other than the CORESET having index 0, if the terminal receives configuration information of the TCI state through the CORESET configuration information as part of the reconfiguration with sync procedure, but does not receive a MAC CE activation command indicating or activating a TCI state for the CORESET, the terminal may assume that the DM-RS antenna port of the PDCCH received from the CORESET and the SS / PBCH block or CSI-RS identified in the random access procedure initiated by the reconfiguration with sync procedure are QCL.

[0259] For a CORESET other than the CORESET having index 0, a terminal that has been provided with a TCI state for said CORESET, or has received a MAC CE activation command indicating or activating a TCI state for said CORESET, may assume that the DM-RS antenna port of the PDCCH received from said CORESET is QCLed with one or more RSs configured through said TCI state.

[0260] For a CORESET with index 0, the terminal can receive the QCL-TypeD attribute of the CSI-RS from the SS / PBCH, which is set through the MAC CE enable command or the enabled TCI state.

[0261] A terminal that receives MAC CE signaling transmits HARQ-ACK information for the PDSCH providing the MAC CE signaling via PUCCH in a slot (e.g., slot k). Starting from the first slot after the slot, the TCI state indicated by the MAC CE signaling is applied, and a PDCCH is received based on beam information including the TCI state. Here is the number of slots included in each subframe for the subcarrier interval (μ).

[0262] <Slot Format Indicator (SFI)>

[0263] In a 5G communication system, the downlink signal transmission interval and the uplink signal transmission interval can be dynamically changed. To this end, the base station can indicate to the terminal via a Slot Format Indicator (SFI) whether each OFDM symbol constituting a slot is a downlink symbol, an uplink symbol, or a flexible symbol. Here, a flexible symbol may refer to a symbol that is neither a downlink nor an uplink symbol, or a symbol that can be changed into a downlink or uplink symbol by terminal-specific control information or scheduling information. In this case, the flexible symbol may include a gap guard required during the transition from downlink to uplink.

[0264] A terminal that receives the above slot format indicator may perform a downlink signal reception operation from a base station in the symbol indicated by the downlink symbol, and perform an uplink signal transmission operation to a base station in the symbol indicated by the uplink symbol. For the symbol indicated by the flexible symbol, the terminal may perform at least a PDCCH monitoring operation, and through another indicator, e.g. DCI, the terminal may perform a downlink signal reception operation from a base station in the flexible symbol (e.g., when receiving DCI format 1_0 or 1_1) or perform an uplink signal transmission operation to a base station (e.g., when receiving DCI format 0_0 or 0_1).

[0265] FIG. 10 is a diagram illustrating an example of an uplink-downlink configuration (UL / DL configuration) in a 5G system, showing three steps of the uplink-downlink configuration of a symbol / slot.

[0266] Referring to FIG. 10, in the first step, cell-specific setting information (1010) for semi-statically setting uplink-downlink, such as system information like SIB, sets uplink-downlink of a symbol / slot. Specifically, the cell-specific uplink-downlink setting information (1010) within the system information may include uplink-downlink pattern information and information indicating a reference subcarrier interval. The above uplink-downlink pattern information may indicate the transmission periodicity (1003) of each pattern, the number of consecutive full DL slots at the beginning of each DL-UL pattern (1011), the number of consecutive DL symbols in the beginning of the slot following the last full DL slot (1012), the number of consecutive full UL slots at the end of each DL-UL pattern (1013), and the number of consecutive UL symbols in the end of the slot preceding the first full UL slot (1014). At this time, the terminal may determine a slot / symbol that is not indicated as an uplink or downlink as a flexible slot / symbol.

[0267] In the second step, terminal-specific configuration information (1020) transmitted via terminal-specific upper layer signaling (i.e., RRC signaling) indicates symbols to be configured as downlink or uplink within a slot (1021, 1022) containing a flexible slot or a flexible symbol. For example, the terminal-specific uplink-downlink configuration information (1020) may include a slot index indicating a slot (1021, 1022) containing a flexible symbol, a number of consecutive downlink symbols in the beginning of each slot (1023, 1025), and a number of consecutive uplink symbols in the end of each slot (1024, 1026), or may include information indicating the entire downlink or the entire uplink for each slot. At this time, a symbol / slot set as an uplink or downlink through the cell-specific setting information (1010) of the first step cannot be changed to a downlink or uplink through the terminal's unique upper layer signaling (1020).

[0268] Finally, to dynamically change the downlink signal transmission section and the uplink signal transmission section, the downlink control information of the downlink control channel includes a slot format indicator (1030) that indicates whether each symbol within each slot is a downlink symbol, an uplink symbol, or a flexible symbol among a plurality of slots starting from the slot where the terminal detected the downlink control information. At this time, for a symbol / slot set as uplink or downlink in the first and second steps, the slot format indicator cannot indicate that it is a downlink or an uplink. The slot format of each slot (1031, 1032) containing at least one symbol that was not set as uplink or downlink in the first and second steps can be indicated by the corresponding downlink control information.

[0269] A slot format indicator can indicate an uplink-downlink configuration for 14 symbols within a single slot, as shown in below. A slot format indicator can be transmitted simultaneously to multiple terminals via a terminal group (or cell) common control channel. In other words, downlink control information containing a slot format indicator can be transmitted via a PDCCH that is CRC scrambled with an identifier different from the terminal's unique C-RNTI (cell-RNTI), for example, SFI-RNTI. Downlink control information may include slot format indicators for one or more slots, i.e., N slots. Here, the value of N may be an integer greater than 0, or a value set by the terminal from the base station via upper-layer signaling from a set of predefined possible values ​​such as 1, 2, 5, 10, 20, etc. The size of the slot format indicator can be set by the base station to the terminal via upper-layer signaling.

[0270]

[0271]

[0272] In , D represents a downlink symbol, U represents an uplink symbol, and F represents a flexible symbol. According to , the total number of slot formats that can be supported for a single slot is 256. The maximum size of information bits that can be used to indicate a slot format in an NR system is 128 bits, and the base station can set this to the terminal through upper layer signaling, for example, 'dci-PayloadSize'.

[0273] At this time, a cell operating in the unlicensed band may set and direct additional slot formats as shown in by introducing one or more additional slot formats or by modifying at least one of the existing slot formats. shows an example of additional slot formats in which a single slot consists only of uplink symbols and flexible symbols (F).

[0274] 포맷 하나의 슬롯 내의 심볼 번호 (또는 인덱스) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 56 F U U U U U U U U U U U U U 57 F F U U U U U U U U U U U U 58 U U U U U U U U U U U U U F 59 U U U U U U U U U U U U F F ...

[0275] In one embodiment, downlink control information used for slot format indication may indicate slot format(s) for a plurality of serving cells, and slot format(s) for each serving cell may be distinguished by a serving cell ID. Additionally, for each serving cell, slot format combinations for one or more slots may be indicated by downlink control information. For example, if the size of a slot format indicator index field within the downlink control information is 3 bits and indicates a slot format for a single serving cell, the 3-bit slot format indicator index field may indicate one of a total of 8 slot formats (or slot format combinations), and the base station may indicate the slot format indicator index field through terminal group common downlink control information (common DCI).

[0276] In one embodiment, at least one slot format indicator index field included in the downlink control information may be composed of a slot format combination indicator for a plurality of slots. For example, shows a 3-bit slot format combination indicator composed of the slot formats of and . Among the values ​​of the slot format combination indicator, {0, 1, 2, 3, 4} indicate a slot format for one slot. The remaining three values ​​{5, 6, 7} indicate a slot format for four slots, and the terminal may sequentially apply the indicated slot formats to four slots starting from the slot where downlink control information including the slot format combination indicator was detected.

[0277] Slot format combination ID Slot Formats 0 0 1 1 2 2 3 19 4 9 5 0 0 0 0 6 1 1 1 1 7 2 2 2 2

[0278] Unlicensed range

[0279] In the case of a system performing communication in an unlicensed band, a communication device (base station or terminal) intending to transmit a signal through the unlicensed band performs a channel access procedure, listen-before-talk (LBT), or channel sensing for the unlicensed band to be communicated before transmitting the signal. If it is determined through the channel access procedure that the unlicensed band is idle, the communication device may access the unlicensed band and perform signal transmission. If it is determined through the performed channel access procedure that the unlicensed band is not idle, the communication device may not perform signal transmission. Here, the term "channel access procedure" refers to a base station or terminal occupying a channel for a fixed (deterministic) time or an arbitrarily determined time to measure the signal strength received through a channel intended to transmit a signal, and applying the measured signal strength to a predefined threshold or a threshold calculated by a function whose value is determined by at least one of the channel bandwidth, the bandwidth of the signal to be transmitted, and / or the transmission power strength. It is a procedure for comparing with.

[0280] The strength of the received signal measured through sensing on the unlicensed band channel If it is smaller, the base station and the terminal determine that the channel is in an idle state or that the channel is available for use (or occupation), and may occupy and use the channel. If the sensing result If it is equal to or greater than, the base station and the terminal may determine that the channel is in a busy state or that the channel is unavailable for use (or occupancy), and thus may not use the channel. In this case, the base station and the terminal may continuously perform sensing until the channel is determined to be in an idle state. In other words, in an unlicensed band, the channel access procedure may refer to a procedure that evaluates the possibility of performing transmission on the channel based on sensing. The basic unit of sensing is a sensing slot. It can be a section. In this case, at least among the sensing slot sections The power detected in In cases where it is less, the above sensing slot interval may be considered idle or not in use. If, among the above sensing slot intervals, at least The power detected in If it is equal to or greater than, the above sensing slot interval may be considered to be busy or being used by another device.

[0281] Channel access procedures in unlicensed bands can be classified based on whether the initiation time of a communication device's channel access procedure is fixed (frame-based equipment, FBE) or semi-static, or variable (load-based equipment, LBE) or dynamic. In addition to the initiation time of the channel access procedure, a communication device may be determined as either an FBE device or an LBE device depending on whether its transmit / receive structure has a single cycle or not. Here, a fixed initiation time of the channel access procedure may mean that the communication device's channel access procedure can be initiated periodically according to a predefined declaration or a set cycle. As another example, a fixed initiation time of the channel access procedure may mean that the communication device's transmit / receive structure has a single cycle. Here, a variable initiation time of the channel access procedure may mean that the communication device can transmit at any time when it intends to transmit a signal through the unlicensed band. As another example, the statement that the initiation time of the channel access procedure is variable may mean that the transmission and reception structure of the communication device does not have a single cycle and can be determined as needed. In the present disclosure, channel access procedure and channel sensing are used interchangeably, but the channel access procedure or channel sensing operation of the base station or terminal may be identical.

[0282] In the present disclosure, a downlink transmission burst (DL transmission burst) may be defined as follows. A downlink transmission burst is a downlink transmission between base stations. It can mean a set of downlink transmissions transmitted without a larger gap. The gap between downlink transmissions is In the case where it is greater, the downlink transmission may refer to separate downlink transmission bursts. Similarly, an uplink transmission burst (UL transmission burst) may be defined as follows. An uplink transmission burst is between the uplink transmissions of the terminal It can refer to a set of uplink transmissions transmitted without a larger gap. The gap between uplink transmissions is In the case where it is larger, the above uplink transmission may mean separate uplink transmission bursts.

[0283] Channel Access Procedure for Quasi-Static Channel Occupation

[0284] The following describes a channel connection procedure in cases where the initiation time of the channel connection procedure of a communication device is set to a fixed or quasi-static value.

[0285] In a 5G system that performs communication in an unlicensed band, if it can be ensured that no other system exists that shares and uses the unlicensed band channel for a long time by means of regulation and by a method at the same level of regulation, the following semi-static channel access procedure or channel sensing may be performed.

[0286] A base station intending to use a quasi-static channel access procedure provides the terminal with configuration information indicating that the base station's channel access procedure is a quasi-static channel access procedure and / or configuration information regarding quasi-static channel access through upper layer signaling (e.g., SIB1 and / or RRC signaling), thereby enabling the terminal to know whether the base station's channel access procedure is a quasi-static channel access method. Here, an example of configuration information regarding quasi-static channel access is the period during which the base station can begin channel occupancy ( ) may exist. For example, the value of the above period may be 1ms, 2ms, 2.5ms, 4ms, 5ms, or 10ms. When using a quasi-static channel access procedure, the base station, among two consecutive frames, every , that is, starting from the frame with the even index Initiates periodic channel occupancy every time, and maximum You can occupy the channel during this time. Here, It could be.

[0287] FIG. 11 is a diagram illustrating an example of a channel access procedure for quasi-static channel occupation in a wireless communication system according to one embodiment of the present disclosure.

[0288] Referring to FIG. 11, a periodic channel occupancy period ( )(1100), channel occupancy time (COT)(1105, 1107), maximum channel occupancy time ( )(1110), idle period( This is a diagram illustrating the )(1120) and Clear Channel Assessment (CCA) sections (1160, 1165, 1170).

[0289] A base station and a terminal using a quasi-static channel access procedure may perform sensing of said channel in a channel evaluation interval (1160 or 1165) immediately before using or occupying the channel (e.g., downlink transmission (1130) or downlink transmission (1180)) in order to evaluate whether the channel can be used (or occupied). At this time, the sensing must be performed in at least one sensing slot duration, and the sensing slot duration One example of is am.

[0290] An example of a sensing method is to use a predefined, set, or calculated threshold to measure the magnitude or intensity of the received power detected or measured in the sensing slot interval. It may be compared with. For example, the sensing results from the base station and terminal that performed sensing in the channel evaluation interval (1160) If the result is smaller, the base station and the terminal determine that the channel is in an idle state or that the channel is available for use (or occupancy), and may occupy the channel and use the channel up to the maximum channel occupancy time (1110). If the result of the sensing operation is If it is equal to or greater than, the base station and the terminal determine that the channel is in a busy state or that the channel cannot be used (or occupied), and may not use the channel until the time (1180) when the next channel occupancy can begin or until the time (1165) when channel sensing is performed in the next channel evaluation interval (1165).

[0291] When a base station initiates channel occupancy by performing a quasi-static channel access procedure, the base station and the terminal may communicate as follows.

[0292] - Immediately after the sensing slot is sensed to be idle, the base station must perform downlink transmission at the start of the channel occupancy time. If the sensing slot is sensed to be busy, the base station must not perform any transmission during the current channel occupancy time.

[0293] - The gap (1150) between the downlink transmission (1140) that the base station intends to perform within the channel occupancy time (1105) and the previous downlink transmission (1130) and uplink transmission (1132) In the case of a larger size, the base station performs sensing for at least one sensing slot interval (1145) and may or may not perform downlink transmission (1140) depending on the sensing result.

[0294] - The gap (1150) between the downlink transmission (1140) that the base station intends to perform within the channel occupancy time (1105) and the uplink transmission (1132) of the terminal performed prior to that is maximum In the case of (or (If it is equal to or smaller than), the base station can perform downlink transmission (1140) without channel sensing (without the sensing slot interval (1145)).

[0295] - When a terminal performs uplink transmission (1190) within the base station's channel occupancy time (1107), if the gap (1185) between uplink transmission (1190) and downlink transmission (1180) is maximum In the case of (or (If it is equal to or smaller than), the terminal can perform uplink transmission (1190) without channel sensing.

[0296] - In the case where the terminal performs uplink transmission within the base station's channel occupancy time (1107), if the gap (1185) between the uplink transmission (1190) and the downlink transmission (1180) If it is larger, the terminal is immediately before uplink transmission (1190). Channel sensing is performed in at least one sensing slot interval within the interval, and uplink transmission (1190) may or may not be performed depending on the sensing result.

[0297] - The base station and the terminal must at least before the next channel occupancy time begins No transmission should be performed on a continuous set of symbols in the interval.

[0298] Channel Access Procedure for Dynamic Channel Occupation

[0299] Hereinafter, a channel access procedure is described in cases where the initiation time of the channel access procedure of a communication device is variable or dynamic. In a 5G system that performs communication in an unlicensed band, when a semi-static channel access procedure is not used or a dynamic channel access procedure is performed, the base station may perform the following types of channel access procedures or channel sensing.

[0300] In a 5G system that performs communication in an unlicensed band, when semi-static channel access procedures are not used or dynamic channel access procedures are performed, the base station may perform the following types of channel access procedures or channel sensing.

[0301] - Type 1 Downlink Channel Access Procedure

[0302] According to the first type downlink channel access procedure, the base station performs sensing of the channel for a predetermined time or a time corresponding to the number of sensing slots before downlink transmission, and can perform the downlink transmission if the channel is idle. The first type downlink channel access procedure is described in more detail as follows.

[0303] In the Type 1 downlink channel access procedure, parameters for the Type 1 downlink channel access procedure may be determined according to the QCI (Quality of service Class Identifier) ​​or 5QI (5G QoS Identifier) ​​of the signal to be transmitted to the unlicensed band channel. Table 11 below shows an example of the relationship between the channel access priority class and the QCI or 5QI. For example, QCI 1, 2, and 4 may represent QCI values ​​for services such as Conversational Voice, Conversational Video (Live Streaming), and Non-Conversational Video (Buffered Streaming), respectively.

[0304] If a signal for a service that does not match the QCI or 5QI of is to be transmitted to an unlicensed band, the transmitting device may select the QCI closest to the service and the QCI or 5QI of and select a channel access priority type for it. Additionally, if the signal to be transmitted to a channel in an unlicensed band has multiple different QCIs or 5QIs, the channel access priority class may be selected based on the QCI or 5QI with the lowest channel access priority class.

[0305] Channel Access Priority class (p) QCI or 5QI Allowed sizes 1 1, 3, 5, 65, 66, 69, 70, 79, 80, 82, 83, 84, 85 1 3 7 2ms {3, 7} 2 2, 7, 71 1 7 15 3ms {7, 15} 3 4, 6, 8, 9,72,73,74,76 3 15 63 8 or 10ms {15, 31, 63} 4 - 7 15 1023 8 or 10ms {15, 31, 63, 127, 255, 511, 1023}

[0306] Channel access priority class value according to the QCI (Quality of Service Class Identifier) ​​or 5QI (5G QoS Identifier) ​​of the signal to be transmitted over an unlicensed band channel ( Once ) is determined, a channel connection procedure can be performed using channel connection procedure parameters corresponding to the determined channel connection priority class value. For example, as shown in , the channel connection priority class value ( The deferred duration, which are channel connection procedure parameters corresponding to ), Determining the length of ) , a set of values ​​or sizes of the contention window (CW) ) and minimum and maximum values ​​of the competition interval( , The channel access procedure can be performed using ). At this time, after channel occupancy, the maximum available channel occupancy interval ( ) also channel access priority class value( It can be determined according to ).

[0307] FIG. 12 is a diagram illustrating an example of a channel access procedure for dynamic channel occupation in a wireless communication system according to one embodiment of the present disclosure. That is, an example of a first type downlink channel access procedure of a base station is illustrated.

[0308] Referring to FIG. 12, a base station intending to transmit a downlink signal in an unlicensed band at least The channel connection procedure can be performed within a delay time of (1212). Here, the delay interval (1212) is (1210) and It can be constructed sequentially by (1216). Here (1210) is And, (1214, 1220) may represent the length of the sensing slot. At this time, (1210) includes one sensing slot (1214), the sensing slot (1214) It can be located at the start of (1210). The base station is channel access priority class 3 of ( When performing the channel connection procedure with ), the delay interval required to perform the channel connection procedure (1212) is It can be determined as. Here, It could be. (1210) first (1214) If this is idle, (1210) The first of (1214) The remaining time after ( During ), the base station may not perform the channel access procedure. At this time, the base station (the above remaining time ( Even if a channel connection procedure was performed in ), the result of that channel connection procedure may not be used. In other words, Time may refer to the time that delays the channel access procedure regardless of whether the base station performs the channel access procedure.

[0309] should, If it is determined that the unlicensed band within (1212) is idle, the base station may start occupying the channel after N sensing slots (1222). Here is the value of the contention period at or immediately preceding the time when the channel access procedure is initiated with 0 ( It is an integer value arbitrarily selected using ). That is, It may be a value determined by. The detailed method for setting contention intervals is explained again below. For example, the channel access priority classes in In this case, the minimum and maximum competition interval values ​​are 15 and 63, respectively, and the possible competition interval is {15, 31, 63}. Therefore, The value of can be arbitrarily selected from one of the intervals 0 to 15, 0 to 31, or 0 to 63 depending on the contention interval value. The base station performs sensing in every sensing slot, and the strength of the received signal measured in the sensing slot is a threshold value ( If it is smaller than ), N can be updated to N-1. If the strength of the received signal measured in the sensing slot is the threshold ( If it is equal to or greater than ), the base station While maintaining the value of without subtracting, the above delay time ( Channel sensing can be performed in ). If If it is determined that way, the base station may perform downlink transmission. In this case, the base station, according to the channel access procedure class and The above channel can be occupied and used for a period of time.

[0310] In one embodiment, after the channel occupancy time, contention window size adjustment (1260) may be performed. After the contention window size adjustment (1260), a delay period required to perform the channel access procedure. (1212) can exist again. Delay interval (1212) within (1210) Time may be included. And, After section (1262), the channel connection procedure may be initiated.

[0311] The above-mentioned first type downlink channel access procedure can be divided into the following steps. The base station delay time Sense that the channel is idle during the sensing slot interval of (1212), and counter If the value of is 0, downlink transmission can be performed. At this time, the counter It can be adjusted according to channel sensing performed in additional sensing slot interval(s) according to the following steps.

[0312] Step 1: Set it to and proceed to Step 4. Here, 0 and It is a number randomly selected from among them.

[0313] Step 2: If If so, the base station counter Decide whether to decrease it. If it is decided to decrease the counter, Set to.

[0314] Step 3: The base station senses the channel during an additional sensing slot interval. If the channel is determined to be idle, proceed to Step 4. If the channel is not idle, proceed to Step 5.

[0315] Step 4: If Then, initiate downlink transmission, If not, proceed to Step 2.

[0316] Step 5: Delay section Until a busy sensing slot is detected within, or a delay period Sensing the channel until all sensing slots within are detected to be idle.

[0317] Step 6: If, delay interval If it is detected that all sensing slots within are idle, proceed to step 4. Otherwise, proceed to step 5.

[0319] Base station competition section ( The procedure for maintaining or adjusting the value is as follows. In this case, the contention window adjustment procedure is applied when the base station performs a downlink transmission including a PDSCH corresponding to at least channel access priority class p, and consists of the following steps.

[0320] Step 1: For all channel access priority class p Set to,

[0321] Step 2:

[0322] - If, last If HARQ-ACK feedback is available after the update, proceed to step 3.

[0323] - In cases where this is not the case, if the downlink transmission of the base station transmitted after the Type 1 channel access procedure does not include a retransmission, or if the said downlink transmission is the last From immediately after the reference interval of the first downlink transmission burst (DL transmission burst) transmitted following the Type 1 channel connection procedure after the update If transmitted within the interval, proceed to step 5.

[0324] - In cases other than the above, proceed to Step 4.

[0325] Step 3: Use the HARQ-ACK feedback for the PDSCH transmitted in the reference interval of the most recent downlink transmission burst for which HARQ-ACK feedback for the PDSCH transmitted in the reference interval is available as follows.

[0326] - Among the above HARQ-ACK feedbacks, if at least one HARQ-ACK feedback for a PDSCH transmitted in units of a TB (transport block) is ACK, or if at least 10% of the HARQ-ACK feedbacks for a PDSCH transmitted in units of a Code block group (CBG) is ACK, proceed to step 1.

[0327] - Otherwise, proceed to Step 4.

[0328] Step 4: For all channel access priority class p allowed Increase the value to the next largest value among the current values.

[0329] - If, currently If so, granted as the next largest value Is am.

[0330] - If, In creating continuously When used once, the above channel connection priority class About cast It can be initialized to. At this time, is the connection priority class for each channel among {1,2,...,8} The base station can select regarding.

[0331] Step 5: For all channel access priority class p Maintain and proceed to Step 2.

[0333] The section above Is is. Here, is an uplink / downlink transmission burst section from the start of the reference section, It is a unit value. In a 5G system performing communication in an unlicensed band, if it cannot be guaranteed by regulations and methods at the same level as the said regulations that another system does not exist that shares and uses the unlicensed band channel for a long period of time, and, in the case where it is not am.

[0334] In one embodiment, the reference duration may refer to the period from the start of channel occupancy to the end of the first slot, which includes at least one unicast PDSCH transmitted through the entire time-frequency resource area allocated to the PDSCH, within the channel occupancy including the PDSCH transmission of the base station, or the period from the start of channel occupancy to the end of the downlink transmission burst, which includes at least one unicast PDSCH transmitted through the entire time-frequency resource area allocated to the PDSCH, whichever occurs earlier in time. If the base station's channel occupancy includes a unicast PDSCH but does not include a unicast PDSCH transmitted through the entire time-frequency resource area allocated to the PDSCH, the first downlink transmission burst period including the unicast PDSCH may be the reference duration. Here, channel occupancy may refer to a transmission performed by the base station after the channel access procedure.

[0336] - Type 2A Downlink Channel Access Procedure

[0337] According to the Type 2A downlink channel access procedure, the base station, immediately before downlink transmission, at least Sensing of the channel is performed during the interval, and if the channel is idle, downlink transmission can be performed. At this time, Is by length and one sensing slot ( ) is configured sequentially. Here is one sensing slot ( Includes ), and the start time of the sensing slot is It can be the same as the start time of. That is, is a sensing slot ( It can start with ). When a base station performs a downlink transmission that does not include a downlink data channel transmitted to a specific terminal, a Type 2A downlink channel connection procedure may be performed.

[0338] - Type 2B Downlink Channel Access Procedure

[0339] According to the Type 2B downlink channel access procedure, the base station, immediately before downlink transmission, at least Channel sensing is performed within the interval, and if the channel is idle, downlink transmission can be performed. Here is one sensing slot ( Includes ), and the sensing slot is The last It can be located at. That is, is a sensing slot ( It terminates as. The Type 2B downlink channel access procedure is that the gap between the start of the downlink transmission that the base station intends to transmit and the end of the uplink transmission of the terminal is or It is applicable in cases below.

[0340] - Type 2C Downlink Channel Access Procedure

[0341] The Type 2C downlink channel access procedure is such that the gap between the start of downlink transmission by the base station and the end of uplink transmission by the terminal or It is applicable in cases below, and the base station can perform downlink transmission without a separate procedure or channel sensing. In this case, the maximum duration of the downlink transmission performed after the Type 2C downlink channel access procedure is It could be.

[0342] Here, unlike the first downlink channel access procedure, the 2A, 2B, and 2C type downlink channel access procedures are characterized by the fact that the channel sensing interval or timing performed by the base station prior to downlink transmission is deterministic. Based on this characteristic, it is also possible to further classify the downlink channel access procedures as follows.

[0343] - Type 1: A type that performs a downlink transmission after performing a channel connection procedure for a variable time, corresponding to the above Type 1 downlink channel connection procedure.

[0344] - Type 2: A type that performs downlink transmission after performing a channel connection procedure for a fixed period of time, corresponding to the downlink channel connection procedures of Type 2A and Type 2B above.

[0345] - Type 3: A type that performs downlink transmission without performing a channel connection procedure, corresponding to the downlink channel connection procedure of Type 2C above.

[0346] <Energy Detection Threshold Adjustment Procedure>

[0347] A base station performing channel access procedures or channel sensing uses an energy detection threshold or a sensing threshold It can be set as follows. At this time, represents the maximum energy detection threshold or sensing threshold. It must be set to a value equal to or less than, and the unit is dBm.

[0348] In a 5G system performing communication in an unlicensed band, if it can be ensured by regulations and methods at the same level as said regulations that another system does not exist that shares and uses the unlicensed band channel for a long period of time, is. Here, is the maximum energy detection threshold required by regional regulations, in units of dBm. If the maximum energy detection threshold required by regulations is not set or defined It could be.

[0349] In cases other than the above, that is, in 5G systems that perform communication in an unlicensed band, where it is not guaranteed that there is no other system that shares and uses the channel of the unlicensed band for a long time by means of regulations and methods of the same level as the regulations, the maximum energy detection threshold can be determined through the following <Equation 1>.

[0350] [Mathematical Formula 1]

[0351]

[0352] In the above <Mathematical Formula 1> It is 10dBm during transmission including PDSCH, and during Discovery signal and channel transmission is 5dB. is 23dBm, and is the maximum output power of the base station, in dBm units. Regardless of whether downlink transmission is transmitted through one channel or multiple channels, the base station can calculate a threshold using the maximum transmit power transmitted through a single channel. Here BW is the bandwidth for a single channel, in units of MHz.

[0353] In one embodiment, the terminal has an energy detection threshold The method for determining is as follows.

[0354] The base station can set the maximum energy detection threshold of the terminal through upper-layer signaling, for example, 'maxEnergyDetectionThreshold'. A terminal that has received or been set 'maxEnergyDetectionThreshold' from the base station, It can be set to the value set by the above parameter. A terminal that has not received or set 'maxEnergyDetectionThreshold' from the base station is as follows: It can be configured. If the terminal does not receive or set an energy detection threshold offset from the base station, the terminal cast It can be set to. If the terminal receives or is set to an energy detection threshold offset from the base station, as a value adjusted by the aforementioned energy detection threshold offset You can set it. Here, It can be determined as follows.

[0355] In a 5G system performing communication in an unlicensed band, if it can be guaranteed by regulations and methods at the same level as said regulations that there is no other system sharing and using the unlicensed band channel for an extended period, the base station may provide a higher-layer signaling, for example, 'absenceOfAnyOtherTechnology', to the terminal. A terminal that has received or been configured with 'absenceOfAnyOtherTechnology' through the higher-layer signaling from the base station, It can be set to. Here, is the maximum energy detection threshold required by regional regulations, in units of dBm. If the maximum energy detection threshold required by the above regulations is not set or defined ...is. A terminal that has not received or been configured with the above 'absenceOfAnyOtherTechnology' through upper-layer signaling from a base station, through the above <Equation 1> It can determine. At this time, And, Is am.

[0356] <Directional Channel Access Procedure>

[0357] In a base station and a terminal communicating in an unlicensed band, if the base station and / or the terminal intend to perform communication using multiple beams, the base station or the terminal may perform a channel access procedure for the beam (or direction) to which a signal is to be transmitted. For example, in FIG. 1, the base station may perform a channel access procedure for at least one of the beams (112 or 113) of a specific direction. Such a channel access procedure may be referred to as a directional channel access procedure or a directional LBT. More specifically, a directional channel access procedure may mean a procedure of performing sensing on a beam (or receiving beam) including at least the beam to be transmitted (transmission beam or transmission beam) or a direction corresponding to that beam, and evaluating the possibility of performing transmission using the transmission beam in the channel based on the sensing. For example, the basic unit of sensing is Sensing slot of the section ( In the case of ), at least among the sensing slot intervals where sensing is performed in the transmission beam or in the direction of the transmission beam The power detected during that time In cases where it is less, the sensing slot interval in the direction of the transmission beam may be considered idle or not in use. If, among the sensing slot intervals above, at least The power detected during that time If it is equal to or greater than, the sensing slot interval in the direction of the transmission beam may be considered to be busy or being used by another device. Accordingly, depending on the result of the directional channel access procedure, the base station or terminal may be able to transmit a signal to a specific beam or direction that has successfully occupied the channel, and may not be able to transmit a signal to a specific beam or direction that has failed to occupy the channel.

[0358] Although the above description explains that the directional channel connection procedure is performed based on a beam, the directional channel connection procedure can be performed using parameters other than a beam.

[0359] For example, the term "directional channel access procedure" may mean a procedure for performing channel sensing on a spatial domain transmission filter (or spatial Tx filter) set by a base station or terminal to transmit a signal, or a spatial domain reception filter (or spatial Rx filter) set based on said transmission filter, and evaluating the possibility of performing transmission using said transmission beam in the channel based on said channel sensing.

[0360] As another example, a directional channel access procedure may mean a procedure in which a base station performs channel sensing on a spatial domain transmission filter used to transmit a synchronization signal block (SSB) or a reception filter set based on said transmission filter, and evaluates the possibility of performing transmission using said transmission beam in the channel based on said channel sensing.

[0361] As another example, a directional channel access procedure may refer to a procedure in which a base station or a terminal performs channel sensing according to a TCI-state set or indicated for a signal to be transmitted, and evaluates the possibility of performing transmission using the transmit beam in the channel based on the channel sensing. For example, the base station and the terminal may perform channel sensing on a spatial domain transmission filter set to transmit a reference signal set or indicated in the TCI state of the signal to be transmitted, or on a reception filter set based on said filter.

[0362] Hereinafter, for the convenience of explanation, the term "directional channel access procedure" is described as performing sensing based on a TCI-state set or instructed on a signal to be transmitted by a base station or terminal; however, the various embodiments proposed in this disclosure may be applied not only to cases where sensing is performed based on a TCI-state, but also to cases of directional channel access procedures according to the various examples described above.

[0363] <Configured grant transmission>

[0364] The procedure for transmitting and receiving uplink / downlink signals or channels of a terminal can be broadly classified into two types as follows. The terminal receives a DCI transmitted from a base station via a downlink control channel (e.g., PDCCH) and can perform uplink / downlink transmission and reception (e.g., PDSCH reception or PUSCH transmission) according to the information of the received DCI. For convenience of explanation, in this disclosure, the method of performing uplink / downlink transmission and reception through the above procedure is referred to as the first uplink / downlink transmission and reception method or the first transmission and reception method.

[0365] Another uplink / downlink transmission and reception method is a method in which a terminal can transmit and receive uplink / downlink signals or channels according to transmission and reception setting information configured through an upper signal, etc., without receiving a separate DCI from a base station; this method is also referred to as SPS (Semi-Persistent Scheduling), grant-free, or configured grant method. In this disclosure, the method in which a terminal performs uplink / downlink transmission and reception without receiving a DCI is referred to as the second uplink / downlink transmission and reception method or the second transmission and reception method. At this time, the terminal's second uplink / downlink transmission and reception may be initiated after the terminal receives a DCI from a base station that instructs the activation of the second uplink / downlink transmission and reception configured through the upper signal. At this time, the terminal can perform the second uplink / downlink transmission and reception according to the information of the DCI instructing the activation of the second uplink / downlink transmission and reception and the uplink / downlink transmission and reception setting information configured through the upper signal. If the terminal receives a DCI and / or a corresponding upper signal from the base station instructing the release of the second up / downlink transmission and reception, the terminal may no longer perform the set second up / downlink transmission and reception. After receiving a DCI that activates the second up / downlink transmission and reception as described above, the method of performing the second up / downlink transmission and reception can be classified as a type 2 second up / downlink transmission and reception method. Alternatively, it may be determined that the second up / downlink transmission and reception method is activated immediately after the terminal receives only the upper signal related to the second up / downlink transmission and reception, without receiving a separate DCI for activating or deactivating the terminal's second up / downlink transmission and reception as described above. Similarly, the base station may release the second up / downlink transmission and reception set for the terminal by resetting the upper signal related to the second up / downlink transmission and reception, and at this time, the terminal may not perform the second up / downlink transmission and reception set.As described above, a method in which the second up / down link transmission and reception is enabled without receiving a DCI that enables the second up / down link transmission and reception, or solely through upper signal settings, can be classified as a type 2 method of second up / down link transmission and reception.

[0366] The second transmission and reception method is divided into downlink and uplink and explained in more detail as follows.

[0367] The downlink second transmission / reception method is a method in which a base station periodically transmits a downlink data channel to a terminal based on information set in the upper signaling without DCI transmission. It is mainly used when transmitting VoIP or periodically occurring traffic, and overhead can be minimized because the downlink data channel can be transmitted without DCI transmission.

[0368] The terminal can receive at least one of the setting information for receiving a downlink of a second transmission and reception method as follows from the base station through an upper signal.

[0369] - Periodicity: Period of the second transmission / reception method

[0370] - nrofHARQ-Processes: Number of HARQ processes configured for the second transmission / reception method

[0371] - n1PUCCH-AN: HARQ resource configuration information for transmitting the reception result of the PDSCH received via the second transmit / receive method to the base station.

[0372] - mcs-Table: MCS table configuration information applied to transmission of the second transmission / reception method

[0374] Similarly, the terminal can receive configuration information for uplink transmission of a second transmission and reception method as follows from the base station through an upper signal.

[0375] - frequencyHopping: A field indicating whether it is intra-slot hopping or inter-slot hopping. If this field is missing, frequency hopping is disabled.

[0376] - cg-DMRS-Configuration: DMRS configuration information

[0377] - mcs-Table: A field indicating whether to use the 256QAM MCS table or the new64QAM MCS table during PUSCH transmission without transform precoding. If this field is missing, the 64QAM MCS table is used.

[0378] - mcs-TableTransformPrecoder: A field indicating the MCS table used by the terminal during transform precoding-based PUSCH transmission. If this field is missing, the 64QAM MCS table is used.

[0379] - uci-OnPUSCH: Apply betta-offset in either a dynamic or semi-static manner

[0380] - resourceAllocation: Sets whether the resource allocation type is 1 or 2

[0381] - rbg-Size: Determines one of two configurable RGB sizes

[0382] - powerControlLoopToUse: Determines whether to apply closed-loop power control

[0383] - p0-PUSCH-Alpha: Apply Po and PUSCH alpha values

[0384] - transformPrecoder: Sets whether to apply Transformer precoding. If this field is missing, it follows the msg3 settings.

[0385] - nrofHARQ-Processes: Number of configured HARQ processes

[0386] - repK: Number of repeated transmissions

[0387] - repK-RV: RV pattern applied to each iteration during iteration. If the number of iterations is 1, this field is disabled.

[0388] - Periodicity: Transmission period, ranging from a minimum of 2 symbols to units of 640 to 5120 slots depending on the maximum subcarrier spacing.

[0389] - configuredGrantTimer: A timer configured in multiple periodicity units to guarantee retransmission.

[0390] At this time, in the case of type 1 of the second transmission and reception method, the terminal may additionally receive the following configuration information from the base station through an upper signal (e.g., rrc-ConfiguredUplinkGrant). At this time, in the case of type 2 of the second transmission and reception method, the terminal may receive at least one of the following configuration information through DCI.

[0391] - timeDomainOffset: A value indicating the first slot where uplink transmission of the second transmission / reception mode begins, representing slot-unit information based on SFN (system frame number) 0.

[0392] - timeDomainAllocation: A field indicating the uplink transmission time resource area of ​​the second transmission / reception mode, using startSymbolAndLength or SLIV values

[0393] - Frequency Domain Allocation: A field indicating the uplink transmission frequency resource area of ​​the second transmission / reception method.

[0394] - antennaPort: Antenna port configuration information applied to uplink transmission of the second transmission / reception method

[0395] - dmrs-SeqInitialization: field set when transform precoder is disabled

[0396] - precodingAndNumberOfLayers

[0397] - srs-ResourceIndicator: A field that provides SRS resource configuration information

[0398] - mcsAndTBS: MCS and TBS applied to the uplink transmission of the second transmission / reception mode

[0399] - frequencyHoppingOffset: frequencyhoppingoffset value

[0400] - pathlossReferenceIndex

[0401] In the present disclosure, all setting information regarding the transmission of the second transmission and reception method can be set per Pcell or Scell, and can also be set per frequency band section (BWP, Bandwidth Part). In addition, one or more transmissions of the second transmission and reception method can be set per specific cell and per BWP.

[0402] The method by which a terminal determines the uplink transmission resource of the second transmission and reception method (hereinafter referred to as the second uplink transmission resource) is explained as follows.

[0403] The terminal may receive period information (P) and offset values ​​for a second uplink transmission resource from the base station via an upper signal. At this time, each of the period or offset value may be a unit of at least one of absolute time (e.g., ms), slot, or symbol. Generally, the offset value is equal to or smaller than the period of the second uplink transmission resource, and the units of the period and offset value may be different or independent. Additionally, the offset value may be an offset value based on a specific time (e.g., System Frame Number 0) that is predefined or set via the upper signal.

[0404] At this time, in the case of a second uplink transmission of type 2, the terminal can receive the offset information through a DCI that enables the second uplink transmission of type 2. The offset value at this time may be an offset value based on the DCI receiving slot.

[0405] FIG. 13 is a drawing illustrating an example of a second up / down link transmission method in a wireless communication system according to one embodiment of the present disclosure.

[0406] Referring to FIG. 13, the terminal may receive period information P (1300) and an offset value (1310) for a second uplink transmission resource from a base station via an upper signal. At this time, the offset value (1310) is a value based on a specific time (e.g., System Frame Number 0) that is predefined or set via an upper signal, or a slot or symbol corresponding thereto, or a slot that receives a DCI that enables the second uplink transmission, or the first (or last) symbol of the PDCCH that receives the DCI, or the first (or last) symbol of the control resource set in which the PDCCH that transmits the DCI that enables the second uplink transmission is transmitted.

[0407] The terminal can determine the Nth uplink transmission resource (1350, 1352, 1354, ...) through the period (1300) information set through the upper signal and the offset (1310) above, and this can be expressed using a mathematical formula as follows. Mathematical formula 2 is a mathematical formula for determining the second uplink transmission resource of the type 1 method.

[0408] [Mathematical Formula 2]

[0409] [(SFN Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot) + (slot number in the frame Х numberOfSymbolsPerSlot) + symbol number in the slot] =

[0410] (timeDomainOffset Х numberOfSymbolsPerSlot + symbolstart + N Х periodicity) modulo (1024 Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot), for all N >= 0

[0412] Mathematical formula 3 is a mathematical formula for determining the second uplink transmission resource of the type 2 method.

[0414] [Mathematical Formula 3]

[0415] [(SFN Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot) + (slot number in the frame Х numberOfSymbolsPerSlot) + symbol number in the slot] =

[0416] [(SFNstart time Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot + slotstart time Х numberOfSymbolsPerSlot + symbolstart time) + N Х periodicity] modulo (1024 Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot), for all N >= 0.

[0417] Here, numberOfSlotsPerFrame is the number of slots included in a radio frame or 10ms time defined or set in a carrier or cell where the second uplink transmission is set, and SFN_start time and slot_start time are slots that received a DCI instructing the start or activation of the second uplink transmission. At this time, the Offset value is a value set through the upper signal (in the case of Equation 2) or a value received through time domain resource allocation information included in the DCI that starts or activates the second uplink transmission (in the case of Equation 3).

[0418] At this time, the terminal may receive one or more HARQ process IDs through an upper signal for an uplink transmission transmitted through the second uplink transmission method configured as above, and the HARQ process ID may be calculated for the configured resource in the following way.

[0420] [Mathematical Formula 4]

[0421] HARQ Process ID = [floor(CURRENT_symbol / periodicity)] modulo nrofHARQ-Processes

[0423] Here, CURRENT_symbol=(SFN Х numberOfSlotsPerFrame Х numberOfSymbolsPerSlot + slot number in the frame Х numberOfSymbolsPerSlot + symbol number in the slot), where numberOfSlotsPerFrame and numberOfSymbolsPerSlot represent the number of consecutive slots constituting a frame and the number of consecutive symbols constituting a slot, respectively. nrofHARQ-Processes is the number of HARQ processes configured for uplink transmission via the second uplink transmission method through the upper signal received by the terminal from the base station, and generally has a value from 1 to 16. Here, CURRENT_symbol is the index of the very first symbol for the initial transmission during repK repeated transmissions.

[0424] The terminal may receive configuredGrantTimer through a higher signal, and when a transmission block is initially transmitted through a second uplink transmission method, the terminal may start the configuredGrantTimer for the HARQ process of the transmission block. If the configuredGrantTimer expires, the terminal may transmit a new transmission block using the HARQ process corresponding to the second uplink transmission resource.

[0426] At this time, the terminal may be configured to transmit a single transmission block repeatedly up to a maximum of repK times through the second uplink transmission method. Here, repK is a value that can be set or indicated through an upper signal and / or DCI, and a terminal with a set repK value, or a terminal with a set repK value greater than 1, may transmit the same transmission block repeatedly as many times as the repK value. At this time, the terminal may receive a maximum value of repK through the upper signal and receive a value, repK', that the terminal must repeatedly transmit from the DCI that activates the second uplink transmission method, where repK' is a value equal to or smaller than repK. At this time, repK may be the number of transmissions including the first transmission or initial transmission of the transmission block transmitted through the second uplink transmission method, and may have one of the values ​​including 1 (e.g., repK=1, 2, 4, 8). At this time, the value of repK is an example and is not limited to the above value. The second uplink transmission resource, which is transmitted repeatedly repK times, can be transmitted repeatedly repK-1 times in a continuous symbol or a continuous slot based on the second uplink transmission resource for initial transmission determined using the above mathematical formulas 2 to 3.

[0427] <Downlink Feedback Information (DFI)>

[0428] A base station may provide the terminal with a reception result for a transmission block transmitted by the terminal through an uplink data channel, or HARQ-ACK information, using at least one DCI format. For example, the base station may use DCI format 0_1 ​​of a 5G system. In this case, the DCI may include a reception result for a transmission block transmitted by the terminal through a second uplink transmission method. In this case, the DCI may include a reception result for both transmission blocks transmitted by the terminal through a first uplink transmission method and a second uplink transmission method. In this case, for convenience of explanation, DCI format 0_1 ​​will be used for the description, but DCI format 0_1 ​​is merely an example, and it is also possible to use another DCI format.

[0429] Here, DCI format 0_1 ​​is a DCI format that can be used as a non-fallback DCI to schedule one or more PUSCHs to a terminal or to provide Configured Grant Downlink Feedback Information (CG-DFI). The CRC of DCI format 0_1 ​​can be scrambled into at least one RNTI among C-RNTI, CS (configured scheduling)-RNTI, MCS (modulation coding scheme)-C-RNTI, and SP (Semi-Persistent)-CSI-RNTI.

[0430] The cases in which DCI format 0_1 ​​is used to indicate CG-DFI are as follows.

[0431] In the case where DCI format 0_1 ​​is a DCI format for a cell operating in an unlicensed band, the DCI format 0_1 ​​in which the CRC is CS-RNTI scrambled may include a DFI flag field. At this time, a terminal receiving the DCI may determine that the DCI is a DCI that activates a second uplink transmission / reception method or a second uplink transmission resource (or a DCI that schedules PUSCH) if the value of the DFI flag field is 0, and may determine that the DCI is a DCI that indicates CG-DFI if the value of the field is 1.

[0432] If DCI format 0_1 ​​is used to indicate CG-DFI, DCI format 0_1 ​​can be configured as follows.

[0433] - Identifier for DCI formats: An identifier for distinguishing DCI formats in a 1-bit field. For example, when a terminal receives DCI through the 1-bit identifier, if the value of the identifier is 0, the DCI is in UL DCI format (e.g., DCI format 0_1), and if it is 1, the DCI is in DL DCI format (e.g., DCI format 1_0).

[0434] - Carrier indicator: A 0 or 3-bit field indicating the serving cell index of the PUSCH cell scheduled by the DCI.

[0435] - DFI flag: A field of size 0 or 1 bit that distinguishes to the terminal whether the received DCI activates the second uplink transmission resource or indicates CG-DFI.

[0436] - HARQ-ACK-bitmap: Consists of a 16-bit bitmap, where each bit is mapped to a single HARQ process index. In this case, the HARQ process indices are mapped in ascending order from the smallest HARQ process index to the largest HARQ process index, starting from the MSB to the LSB of the bitmap.

[0437] - Controls the increase or decrease of the terminal's PUSCH transmission power using the PUSCH transmission power control (TPC command for scheduled PUSCH) field.

[0438] - To match the DCI size with other DCI formats, set all remaining bits to 0.

[0439] Accordingly, when the value of the DFI flag field of DCI format 0_1 ​​received by a terminal configured to monitor a CS-RNTI scrambling DCI format 0_1 ​​containing a DFI flag field is 1, the terminal determines that the DCI format is a DCI format that provides HARQ-ACK information for a transmission block transmitted through an uplink data channel, and receives the reception result of the base station through the HARQ-ACK bitmap included in the DCI format.

[0440] The above HARQ-ACK bitmap may be HARQ-ACK information for a transmission block received by the base station from the terminal via an uplink data channel for all HARQ processes for a serving cell in which the base station transmits DCI format 0_1, or for all uplink HARQ processes set in the serving cell. In this case, if the DCI format 0_1 ​​includes a carrier indicator, the above HARQ-ACK bitmap may be HARQ-ACK information for a transmission block received by the base station from the terminal via an uplink data channel for all HARQ processes for a serving cell indicated by the carrier indicator, or for all uplink HARQ processes set in the serving cell.

[0441] For a transmission block transmitted through the uplink data channel of the second uplink transmission method, if the terminal receives the first symbol of PDDCH that transmits a DCI format indicating CG-DFI after the X symbol based on the last symbol of the uplink data channel, it determines that the HARQ-ACK information for the HARQ process number (or index) corresponding to the transmission block transmitted through the uplink data channel is valid. At this time, X is a value set from the base station through an upper signal or a value that can be predefined between the base station and the terminal.

[0442] For a transmission block transmitted through an uplink data channel of the second uplink transmission method, when a terminal receives a CG-DFI that provides HARQ-ACK information for a HARQ process number corresponding to the transmission block, if the first symbol of the PDCCH that transmits the DCI format 0_1 ​​providing the CG-DFI is at least X symbols after the last symbol of either the uplink data channel or the uplink data channel that is repeatedly transmitted, the terminal determines that the HARQ-ACK information corresponding to the HARQ process number of the transmission block provided through the CG-DFI is valid. At this time, X is a value set by the base station through an upper signal or a value that can be predefined between the base station and the terminal.

[0444] For a transmission block initially transmitted through the uplink data channel of the second uplink transmission method, if the terminal receives a CG-DFI providing HARQ-ACK information for said transmission block, and the value of said HARQ-ACK information is ACK, the terminal assumes that the base station has correctly received (or successfully decoded) said transmission block. If the value of said HARQ-ACK information is NACK, the terminal assumes that the base station has not correctly received (or successfully decoded) said transmission block.

[0446] In the following, regarding a transmission block transmitted through the uplink data channel of the first uplink transmission method, the case where the uplink data channel transmits in multiple slots is explained. When a terminal receives a CG-DFI providing HARQ-ACK information for a HARQ process number corresponding to the transmission block,

[0447] - When the above HARQ-ACK information is ACK, if it is at least X symbols after the last symbol of the uplink data channel transmitted in the first slot among the uplink data channels transmitted in multiple slots, the terminal determines that the HARQ-ACK information corresponding to the HARQ process number of the transmission block provided through the above CG-DFI is valid.

[0448] - When the above HARQ-ACK information is NACK, and when it is at least X symbols after the last symbol of the uplink data channel transmitted in the last slot among the uplink data channels transmitted in multiple slots, the terminal determines that the HARQ-ACK information corresponding to the HARQ process number of the transmission block provided through the above CG-DFI is valid.

[0449] In this case, the above X is a value set from the base station through an upper signal, or a value that can be predefined between the base station and the terminal.

[0450] <CBG-based transmission>

[0451] The terminal can be configured to transmit and receive data transmitted through a downlink data channel or an uplink data channel, that is, a transport block (TB) or a codeword (CW), by dividing it into one or more code blocks (CB) or code block groups (CBG) through an upper signal from a base station as follows.

[0452] <PDSCH-CodeBlockGroupTransmission Information Element>

[0453]

[0454] <PUSCH-CodeBlockGroupTransmission Information Element>

[0455]

[0456] FIG. 14 is a drawing illustrating a code block and a code block group in a wireless communication system according to one embodiment of the present disclosure.

[0457] According to FIG. 14, for data or a transmission block (1401) to be transmitted via a downlink or uplink, a cyclic redundancy check (CRC, 1403) may be added to the end or beginning of the transmission block (1401) so that a terminal or base station receiving the transmission block (1401) can determine whether the transmission block (1401) has been correctly received through a CRC check. The CRC may have 16 bits, 24 bits, or a predetermined fixed number of bits, or may have a variable number of bits depending on the amount or size of information, or channel conditions, and may be used to determine whether channel coding is successful. At this time, the transmission block and the block to which the CRC has been added may be divided into several code blocks (1407, 1409, 1411, 1414) (1405).

[0458] At this time, the transmission block may be divided into a maximum size of a predefined code block, or a maximum size of a code block set through an upper signal from a base station. Accordingly, among the code blocks constituting the transmission block, at least one code block, such as the first code block (1407) or the last code block (1413), may be smaller in size than the other code blocks. In this case, 0, a random value, or 1 may be inserted into the first code block (1407) or the last code block (1413) to make it equal in length to the other code blocks. CRCs (1417, 1419, 1421, 1423) may be added to each of the one or more divided code blocks (1415). The CRC may have 16 bits, 24 bits, or a predetermined fixed number of bits, or may have a variable number of bits depending on the amount or size of information, or channel conditions, and may be used to determine whether channel coding is successful.

[0459] The CRC (1403) added to the transmission block (1401) and the CRCs (1417, 1419, 1421, 1423) added to the code block may be omitted depending on the type of channel code to be applied to the code block. For example, if an LDPC code is applied to the code block instead of a turbo code, all or part of the CRCs (1417, 1419, 1421, 1423) to be inserted in each code block may be omitted. In this case, the omission of part of the CRC means that the CRC length is reduced. However, even when an LDPC code is applied to the code block, the CRCs (1417, 1419, 1421, 1423) may be added to the code block as is. Additionally, when a polar code is used, the CRC may be added or omitted.

[0460] Additionally, one or more code blocks may be organized into code block groups (CBG). In this case, the base station may configure the terminal to group a single transmission block into up to M code block groups via a higher signal (e.g., maxCodeBlockGroupsPerTransportBlock). Referring to FIG. 14 as an example, if the terminal receives from the base station a setting of M as the maximum number of code block groups for a single transmission block via a higher signal, the terminal may group the transmission block divided into N code blocks into M code block groups (1430, 1435). In this case, the number of code blocks included in a single code block group may vary depending on the size of the transmission block. In other words, since the number of code blocks varies depending on the size of the transmission block, the number of code blocks included in the code block group may also vary. For example, if the transmission block is divided into M code blocks, a single code block group may consist of a single code block. If a transmission block is divided into 2M code blocks, a group of code blocks can be composed of two code blocks. That is, the number of code blocks included in a group of code blocks can vary depending on the size of the transmission block or the number of code blocks constituting the transmission block.

[0461] At this time, a terminal configured to determine that a codeword or transmission block transmitted or received through a downlink data channel is divided into one or more code block groups (e.g., M code block groups, where M is a positive integer equal to or greater than 1) can transmit to a base station the downlink reception result for each of the configured or divided code block groups (M CBGs) to the base station via an uplink control channel or an uplink data channel. At this time, code block group transmission information (CBGTI) indicating which code block group has been transmitted may be included in the DCI that schedules the downlink data channel, and the code block group transmission information field may be composed of a bit sequence consisting of the number of maximum code block groups (M) configured per TB.

[0462] Through the above fields, the terminal can determine the code block group that the base station actually transmitted through the downlink data channel. For example, in the case where M=4, the terminal receives a DCI that schedules the retransmission of downlink data, and if the value of the CBGTI field of the DCI is, for example, 0011, the terminal can determine that the 3rd and 4th code block groups (corresponding data) among the code block groups constituting the transmission block have been transmitted through the downlink data channel. In the case of a DCI that schedules the initial transmission of downlink data, the value of the CBGTI field is set to 1, and the terminal can receive all code block groups constituting the transmission block through the downlink data channel.

[0463] If a terminal configured to determine that a codeword or transmission block transmitted or received through an uplink data channel is divided into one or more code block groups (e.g., M code block groups, where M is a positive integer equal to or greater than 1), the base station may determine the uplink reception result of the base station for each of the divided code block groups (M CBGs) in the following way. The base station may transmit the uplink reception result of the base station for the divided code block groups (M CBGs) to the terminal through downlink control information (UL grant) transmitted to set or schedule uplink data transmission to the terminal (e.g., if NDI included in the DCI is toggled (NDI toggling), the DCI may be interpreted as scheduling new data, and if NDI is not toggled, the DCI may be interpreted as scheduling data retransmission), or transmit the uplink reception result of the base station for the divided code block groups (M CBGs) to the terminal through separate control information or a channel. At this time, the base station may transmit code block group transmission information (CBGTI) to the terminal, which instructs the terminal to transmit which code block group the terminal should transmit, through a DCI that schedules uplink data channel transmission, as in the case of the downlink data channel. In other words, the CBGTI field may be composed of a bit sequence consisting of the number of maximum code block groups (M) per transmission block set, and through the field, the terminal can determine the code block group that the base station has requested to actually transmit through the uplink data channel. For example, in the case where M=4, the terminal receives a DCI that schedules uplink data retransmission, and if the value of the CBGTI field of the DCI is, for example, 0011, the terminal can transmit the 3rd and 4th code block groups (corresponding data) among the code block groups constituting the transmission block through the uplink data channel.In the case of a DCI that schedules the initial transmission of uplink data, the values ​​of the CBGTI fields can all be set to 1, and the terminal can transmit all code block groups constituting the transmission block and the corresponding uplink data through the uplink data channel.

[0465] <Example>

[0466] The present disclosure proposes a method for determining downlink feedback information in an NR-U system. In particular, for an uplink transmission in which a Code Block Group (CBG)-based transmission is configured, the method for determining downlink feedback information is characterized by varying according to an RNTI that scrambles the CRC of a PDCCH that transmits a DCI that schedules the uplink transmission. According to one embodiment, downlink feedback information for a PUSCH scheduled through a DCI scrambled by a CS-RNTI is determined by a TB-level HARQ-ACK, and downlink feedback information for a PUSCH scheduled through a DCI scrambled by a C-RNTI is determined according to a condition indicating whether to adjust the Contention window size or determining whether to adjust it.

[0467] In the present disclosure, a terminal configured to transmit an uplink data channel to a serving cell in code block group units via an upper signal from a base station (e.g., codeBlockGroupTransmission of PUSCH-ServingCellConfig) is described. For convenience of explanation, the uplink data channel will be described in the present disclosure, but the embodiments of the present disclosure may also be applicable to a downlink data channel. Furthermore, unless otherwise noted, in the embodiments of the present disclosure below, "HARQ-ACK information" refers to the reception result of a base station for a transmission block of HARQ process i transmitted by the terminal via the uplink data channel, and in particular, the reception result provided to the terminal by the base station via CG-DFI. For example, if the DFI flag field value of DCI format 0_1 ​​received by the terminal is 1, the terminal may determine that the DCI is a DCI that provides the reception result of a base station for a transmission block transmitted by the terminal via the uplink data channel, that is, a DCI used as CG-DFI. The terminal can receive the base station's reception result for uplink data (or transmission block) corresponding to an uplink HARQ process number (or index), for example, HARQ process i, through the HARQ-ACK-bitmap field of the DCI. At this time, the HARQ-ACK-bitmap field may include HARQ process numbers that are predefined or set through a higher signal, for example, 16 HARQ process numbers. At this time, the base station's reception result for uplink data (or transmission block) corresponding to each HARQ process number in the HARQ-ACK-bitmap may be composed of 1 bit.

[0468] The terminal can receive configuration information regarding uplink data channel transmission as one of the following through the upper signal.

[0469] For example, a terminal may be configured to transmit transmission blocks transmitted through all uplink data channels in units of code block groups, regardless of the uplink transmission method, or may be provided with relevant configuration information. In this case, a terminal that has not been configured or provided with the above configuration information may perform transmission in units of transmission blocks for all uplink transmission methods.

[0470] As another example, the terminal may be configured to transmit transmission blocks transmitted through the uplink data channel in code block group units according to the uplink transmission method, or may be provided with relevant configuration information. In this case, for uplink transmission methods that have not been configured or provided with the above configuration information, the terminal may perform transmission in transmission block units.

[0471] For a terminal that is configured to transmit a transmission block in units of N code block groups according to at least one uplink transmission method according to one of the examples above, or is provided with relevant configuration information, the base station needs a method to convert or generate an N-bit code block group reception result into a 1-bit value. In other words, in the case where the terminal transmits the entire or part of an uplink transmission block in units of N code block groups, the base station needs a method to generate or determine a 1-bit HARQ-ACK information value for the reception result of the N code block groups received in order to provide the terminal with a reception result for the transmission block via CG-DFI. The terminal that receives the 1-bit HARQ-ACK information via CG-DFI also needs a method to correctly determine the base station's reception result for the N code block groups through the received information.

[0472] The present disclosure describes the case assuming that a terminal is configured to transmit transmission blocks transmitted through all uplink data channels in code block group units, regardless of the uplink transmission method. For example, a terminal that receives a higher signal (e.g., PUSCH-CodeBlockGroupTransmission) may transmit transmission blocks transmitted through all uplink data channels in code block group units, regardless of the uplink transmission method. In this case, the embodiments of the present disclosure may also be applicable when a transmission setting in code block group units is received for each uplink transmission method.

[0473] A terminal that has received a higher signal (e.g., PUSCH-CodeBlockGroupTransmission) may transmit a transmission block in code block group units during the initial transmission of the transmission block transmitted through the second uplink transmission method and / or the uplink data channel transmitted to the second uplink transmission resource. At this time, it is assumed that the HARQ process number corresponding to the transmission block is i, and that the set maximum number of code block groups is N. If the terminal has received a retransmission timer for the second uplink transmission method (e.g., cg-RetransmissionTimer) through the higher signal, the terminal may start or restart the retransmission timer during the uplink transmission. If the terminal has not received the base station's reception result regarding the code block group, transmission block, or HARQ process i from the base station until the retransmission timer expires, the terminal may retransmit the code block group or transmission block through the uplink data channel of the second uplink transmission method and / or the uplink data channel transmitted to the second uplink transmission resource. At this time, even if the terminal performs transmission in units of code block groups during the initial transmission, it can always perform retransmission in units of transmission blocks when performing retransmission through the uplink data channel of the second uplink transmission method.

[0474] A base station that receives one or more code block groups transmitted through an uplink data channel of a second uplink transmission method from a terminal may, when the reception result for all code block groups is ACK (or when it is determined that each code block group has been correctly received through a CRC check of each code block group) and / or when the reception result for a transmission block transmitted in units of code block groups is ACK (or when it is determined that the transmission block has been correctly received through a CRC check of the transmission block), set the HARQ-ACK-bitmap information for HARQ process i to a bit value (e.g., 1) signifying ACK and transmit it to the terminal.

[0475] If the reception result for at least one code block group among the reception results for the above code block groups is NACK (or if it is determined that at least one code block group was not correctly received through CRC check of each code block group) and / or if the reception result for a transmission block transmitted in units of code block groups is NACK (or if it is determined that the transmission block was not correctly received through CRC check of the transmission block), the HARQ-ACK-bitmap information for HARQ process i can be set to a bit value (e.g., 0) signifying NACK and transmitted to the terminal. That is, the base station can convert or generate N-bit HARQ-ACK information for N code block groups into 1 bit according to the above criteria and transmit it to the terminal. A terminal that receives 1-bit HARQ-ACK information for HARQ process i can know the base station's reception results for the code block group and / or transmission block through the above criteria.

[0476] In the above, the HARQ-ACK information for HARQ process i is determined as ACK only when the reception result for the code block group is all ACK or when the reception result for the transmission block transmitted in units of the code block group is ACK, because the HARQ operation of the terminal may change depending on the HARQ-ACK information. For example, when the terminal receives HARQ-ACK information, if the retransmission timer (cg-RetransmissionTimer) is running, the terminal stops the retransmission timer. At this time, if the HARQ-ACK information is ACK and the configuredGrantTimer is running, the terminal stops the configuredGrantTimer. In other words, since various timer operations of the terminal and corresponding HARQ operations are determined according to the HARQ-ACK information as described above, when the base station converts or generates N-bit HARQ-ACK information for N code block groups into 1 bit, it is desirable for the correct HARQ operation and management of the terminal to transmit an ACK only when the HARQ-ACK information for all code block groups and / or transmission blocks is an ACK.

[0477] A base station that receives one or more code block groups transmitted from a terminal through an uplink data channel of a first uplink transmission method can convert or generate N bits of HARQ-ACK information for N code block groups into 1 bit according to an RNTI that scrambles the CRC of a DCI or UL grant that schedules the transmission of the uplink data channel of the first uplink transmission method.

[0478] More specifically, a base station that receives one or more code block groups transmitted by a terminal through an uplink data channel of a first uplink transmission method based on a DCI scrambled with CRC by CS-RNTI may transmit HARQ-ACK-bitmap information for HARQ process i to the terminal with a bit value (e.g., 1) representing ACK if the reception result for all code block groups is ACK and / or the reception result for a transmission block transmitted in units of code block groups is ACK. If the reception result for at least one code block group among the reception results for the code block groups is NACK and / or the reception result for a transmission block transmitted in units of code block groups is NACK, the base station may transmit HARQ-ACK-bitmap information for HARQ process i to the terminal with a bit value (e.g., 0) representing NACK.

[0479] At this time, a base station that receives one or more code block groups transmitted by a terminal through an uplink data channel of a first uplink transmission method based on a DCI scrambled with C-RNTI may, if the reception result for at least one code block group among the reception results for the code block groups is ACK, or if the reception result for at least Z% (e.g., Z=10%) of the code block groups received through the uplink data channel is ACK, and / or if the reception result for a transmission block transmitted in units of code block groups is ACK, set the HARQ-ACK-bitmap information for HARQ process i to a bit value (e.g., 1) signifying ACK and transmit it to the terminal. If all of the reception results for the above code block group are NACK, and / or if the reception result for less than Z% (e.g., Z=10%) of the reception results for the code block group received through the uplink data channel is ACK, and / or if the reception result for the transmission block transmitted in units of code block group is NACK, the HARQ-ACK-bitmap information for HARQ process i can be set to a bit value (e.g., 0) signifying NACK and transmitted to the terminal.

[0480] As described above, the reason for determining HARQ-ACK information based on different criteria according to RNTI is that when a terminal receives HARQ-ACK information for a code block group and / or transmission block transmitted based on a DCI scrambled by CS-RNTI, the timer operation and the corresponding HARQ operation are determined according to the received HARQ-ACK information; however, when a terminal receives HARQ-ACK information for a code block group and / or transmission block transmitted based on a DCI scrambled by C-RNTI, the HARQ-ACK information for a code block group and / or transmission block transmitted based on a DCI scrambled by C-RNTI is not used for the timer operation, etc., and can only be used to control the uplink contention interval of the terminal. Accordingly, a base station that receives one or more code block groups transmitted by a terminal through the uplink data channel of the first uplink transmission method based on the DCI scrambled with C-RNTI can generate HARQ-ACK information according to the terminal's uplink contention interval control procedure criteria (e.g., if 10% of the code block groups transmitted within the criteria interval are ACKs, the contention interval is initialized, and otherwise, the contention interval is increased to the next largest value).

[0481] At this time, the base station may use HARQ-ACK information for code block groups and / or transmission blocks transmitted based on DCI scrambled with C-RNTI as indicator information to instruct the terminal to change the contention period. For example, if 10% of the code block groups transmitted within the reference period are ACKs, the terminal can initialize the contention period, so it may determine or generate the corresponding CG-DFI information (HARQ-ACK-bitmap information for HARQ process i) with a bit value (e.g., 0) indicating this and transmit it to the terminal. If fewer than 10% of the code block groups transmitted within the reference period are ACKs, the terminal must increase the contention period, so it may determine or generate the corresponding CG-DFI information (HARQ-ACK-bitmap information for HARQ process i) with a bit value (e.g., 1) indicating this and transmit it to the terminal. The terminal may regard CG-DFI information regarding the HARQ process of one or more code block groups and / or transmission blocks transmitted through the uplink data channel of the first uplink transmission method, based on the DCI scrambled by C-RNTI, as an indicator indicating whether to change the contention period. For example, if the bit value is 0, the terminal may initialize the contention period. If the bit value is 1, the terminal may increase the contention period. Such a method may be applied when the uplink data channel is transmitted within the terminal's reference period, but is not limited thereto.

[0483] FIG. 15 is a flowchart illustrating the operation of a base station according to one embodiment of the present disclosure.

[0484] In step 1500, the base station may transmit an uplink data channel transmission method and related configuration information to the terminal. For example, the base station may transmit a second uplink data channel transmission method and related configuration information to the terminal via an upper signal. At this time, the base station may transmit a DCI to the terminal to activate the uplink transmission of the configured second uplink data channel transmission method. In step 1500, the base station may transmit configuration information to the terminal via an upper signal to cause the terminal to transmit the transmission blocks transmitted through the uplink data channel in units of code block groups.

[0485] In step 1510, the base station can receive the uplink data channel of HARQ process i transmitted by the terminal according to the first uplink transmission method and / or the second uplink transmission method.

[0486] In step 1520, the base station can determine the reception result for the transmission block or code block group received in step 1510.

[0487] In step 1530, the base station may determine or generate CG-DFI information (HARQ-ACK-bitmap information for HARQ process i) in accordance with one embodiment of the present disclosure and transmit it to the terminal.

[0488] According to one embodiment, if all reception results for a code block group transmitted through a second uplink transmission method are ACKs, the base station generates HARQ-ACK-bitmap information for HARQ process i as an ACK, and if the reception result for at least one code block group among the reception results for the code block group is a NACK (or if the reception result for all code block groups is not an ACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as a NACK. As another example, if the result for 10% or more of the code block groups transmitted through the second uplink transmission method is ACK, the base station generates HARQ-ACK-bitmap information for HARQ process i as ACK, and if the result for 10% or more of the code block groups is not ACK (or if the result for 90% or more of the code block groups is NACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as NACK.

[0489] According to one embodiment, if the base station is scheduled through a DCI scrambled with CS-RNTI and all reception results for a code block group transmitted from a terminal via a first uplink transmission method are ACKs, the base station generates HARQ-ACK-bitmap information for HARQ process i as an ACK, and if the reception result for at least one code block group among the reception results for the code block group is a NACK (or if the reception result for all code block groups is not an ACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as a NACK. As another example, if a base station is scheduled through a DCI scrambled with CS-RNTI and the result for a code block group transmitted from a terminal via a first uplink transmission method is ACK for 10% or more of the code block groups, the base station generates HARQ-ACK-bitmap information for HARQ process i as ACK, and if the result for a code block group for 10% or more of the code block groups is not ACK (or if the result for a code block group for 90% or more of the code block groups is NACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as NACK.

[0490] According to one embodiment, if the reception result of at least one code block group among the reception results of a code block group transmitted from a terminal via a first uplink transmission method is ACK, the base station generates HARQ-ACK-bitmap information for HARQ process i as ACK, and if all reception results for the code block group are NACK (or if the reception results for all code block groups are not ACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as NACK. As another example, a base station is scheduled through a DCI scrambled with C-RNTI, and if the result for 10% or more of the code block groups transmitted from a terminal via the first uplink transmission method is ACK, the base station generates HARQ-ACK-bitmap information for HARQ process i as ACK; and if the result for 10% or more of the code block groups is not ACK (or if the result for 90% or more of the code block groups is NACK), the base station can generate HARQ-ACK-bitmap information for HARQ process i as NACK.

[0492] FIG. 16 is a flowchart illustrating the operation of a terminal according to one embodiment of the present disclosure.

[0493] In step 1600, the terminal may receive an uplink data channel transmission method and related configuration information from the base station. For example, the terminal may receive a second uplink data channel transmission method and related configuration information from the base station via an upper signal. At this time, the terminal may receive a DCI transmitted by the base station to activate the uplink transmission of the configured second uplink data channel transmission method, determine the second uplink transmission resource using the upper signal and DCI information, and perform uplink data channel transmission of the second uplink transmission method accordingly. In step 1600, the terminal may receive configuration information from the base station via an upper signal to transmit transmission blocks transmitted through the uplink data channel in units of code block groups.

[0494] In step 1610, the terminal transmits the uplink data channel of HARQ process i to the base station according to the first uplink transmission method and / or the second uplink transmission method.

[0495] In step 1620, the terminal can receive the base station's reception result for the transmission block and / or code block group transmitted through the uplink data channel at least through the CG-DFI.

[0496] In step 1630, the terminal can (re)transmit and / or change the contention interval of the transmission block and / or code block group according to the CG-DFI information (HARQ-ACK-bitmap information for HARQ process i) determined by the base station.

[0497] According to one embodiment, if the reception result of a base station for a transmission block and / or code block group for HARQ process i transmitted via a second uplink transmission method received via CG-DFI is ACK, the terminal determines that the base station has correctly received the transmission block and / or code block group for HARQ process i, and if the retransmission timer (cg-RetransmissionTimer) is running, the terminal may stop the retransmission timer. If the configuredGrantTimer is running, the terminal may stop the configuredGrantTimer. If the reception result of a base station for a transmission block and / or code block group for HARQ process i transmitted via a second uplink transmission method received via CG-DFI is NACK, the terminal determines that the base station has not correctly received the transmission block and / or code block group for HARQ process i, and may stop the retransmission timer (cg-RetransmissionTimer).

[0498] According to one embodiment, if the reception result of a base station for a transmission block and / or code block group for HARQ process i transmitted via a first uplink transmission method through a DCI scrambled with a CS-RNTI received via CG-DFI is ACK, the terminal determines that the base station has correctly received the transmission block and / or code block group for HARQ process i, and if the retransmission timer (cg-RetransmissionTimer) is running, the terminal may stop the retransmission timer. If the configuredGrantTimer is running, the terminal may stop the configuredGrantTimer.

[0499] If the base station's reception result for the transmission block and / or code block group for HARQ process i, which is transmitted via the first uplink transmission method through the DCI scrambled by the CS-RNTI received via CG-DFI, is NACK, the terminal determines that the base station did not correctly receive the transmission block and / or code block group for HARQ process i and may stop the retransmission timer (cg-RetransmissionTimer).

[0500] According to one embodiment, if the reception result of a base station for a transmission block and / or code block group for HARQ process i transmitted via a first uplink transmission method through a DCI scrambled with C-RNTI received via CG-DFI is ACK, or a bit value corresponding to ACK, or a bit value indicating a contention period initialization, the terminal may set the contention period to an initial value. If the reception result of a base station for a transmission block and / or code block group for HARQ process i transmitted via a first uplink transmission method through a DCI scrambled with C-RNTI received via CG-DFI is NACK, or a bit value corresponding to NACK, or a bit value indicating a contention period increase, the terminal may set the contention period to the next larger value after the current contention period value.

[0502] Methods according to the claims or embodiments described in the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0503] When implemented in software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium or computer program product are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the claims or embodiments described in the specification of this disclosure.

[0504] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disc storage devices, CD-ROM (Compact Disc-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0505] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0506] In the present disclosure, the terms “computer program product” or “computer readable medium” are used to collectively refer to media such as memory, a hard disk installed in a hard disk drive, and signals. These “computer program product” or “computer readable medium” are means provided for a method of monitoring a downlink control channel in a wireless communication system according to the present disclosure.

[0507] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0508] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated together as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other variations based on the technical concept of the embodiments may also be possible. For example, the embodiments may be applied to LTE systems, 5G or NR systems, etc.< / coreset> < / time> < / dci> < / bwp>

Claims

Claim 1 A method for a terminal of a wireless communication system comprises: receiving first information from a base station that establishes uplink transmission based on a code block group (CBG); and transmitting uplink data including one or more CBGs to the base station. The method includes the step of receiving second information from the base station indicating an ACK (acknowledgement) or a NACK (negative-ACK) according to the reception result of the base station for the uplink data, wherein if the uplink data is based on upper layer signaling, the second information indicates an ACK when the reception result for one or more CBGs is all ACKs and indicates a NACK when the reception result for at least one CBG is a NACK; if the uplink data is based on downlink control information (DCI) scheduling the uplink data and the radio network temporary identifier (RNTI) associated with the DCI is a configured scheduling-RNTI (CS-RNTI), the second information indicates an ACK when the reception result for one or more CBGs is all ACKs and indicates a NACK when the reception result for at least one CBG is a NACK; and if the uplink data is based on the DCI scheduling the uplink data and the RNTI associated with the DCI is a cell-RNTI (C-RNTI), the second information indicates an ACK when the reception result for at least one CBG is an ACK A method characterized by indicating NACK when the reception result for one or more of the above CBGs is NACK. Claim 2 delete Claim 3 delete Claim 4 A method of a base station of a wireless communication system, comprising: transmitting first information for establishing uplink transmission based on a code block group (CBG) to a terminal; and receiving uplink data including one or more CBGs from the terminal. The method includes the step of transmitting second information to the terminal indicating an ACK (acknowledgement) or a NACK (negative-ACK) according to the reception result of the uplink data, wherein if the uplink data is based on upper layer signaling, the second information indicates an ACK when the reception result for one or more CBGs is all ACKs and indicates a NACK when the reception result for at least one CBG is a NACK; if the uplink data is based on downlink control information (DCI) scheduling the uplink data and the radio network temporary identifier (RNTI) associated with the DCI is a configured scheduling-RNTI (CS-RNTI), the second information indicates an ACK when the reception result for one or more CBGs is all ACKs and indicates a NACK when the reception result for at least one CBG is a NACK; if the uplink data is based on the DCI scheduling the uplink data and the RNTI associated with the DCI is a cell-RNTI (C-RNTI), the second information indicates an ACK when the reception result for at least one CBG is an ACK, and A method characterized by indicating NACK when the reception result for one or more CBGs is all NACK. Claim 5 delete Claim 6 delete Claim 7 In a terminal of a wireless communication system, a transmitting and receiving unit; The control unit is configured to receive first information from a base station for establishing uplink transmission based on a code block group (CBG), transmit uplink data including one or more CBGs to the base station, and receive second information from the base station indicating an ACK (acknowledgement) or a NACK (negative-ACK) according to the reception result of the base station for the uplink data; wherein, if the uplink data is based on upper layer signaling, the second information indicates an ACK when the reception result for all of the one or more CBGs is an ACK and indicates a NACK when the reception result for at least one CBG is a NACK; wherein, if the uplink data is based on downlink control information (DCI) that schedules the uplink data and the radio network temporary identifier (RNTI) associated with the DCI is a configured scheduling-RNTI (CS-RNTI), the second information indicates an ACK when the reception result for all of the one or more CBGs is an ACK and indicates a NACK when the reception result for at least one CBG is a NACK; and wherein the uplink data is based on the DCI that schedules the uplink data and A terminal characterized in that, when the RNTI associated with the DCI is a C-RNTI (cell-RNTI), the second information indicates an ACK when the reception result for at least one CBG is an ACK, and indicates a NACK when the reception result for all of the one or more CBGs is a NACK. Claim 8 delete Claim 9 delete Claim 10 In a base station of a wireless communication system, a transmitting and receiving unit; The control unit comprises: transmitting first information to a terminal that establishes uplink transmission based on a code block group (CBG); receiving uplink data including one or more CBGs from the terminal; and transmitting second information to the terminal that indicates an ACK (acknowledgement) or a NACK (negative-ACK) according to the reception result of the uplink data. If the uplink data is based on upper layer signaling, the second information indicates an ACK when the reception result for all of the one or more CBGs is an ACK, and indicates a NACK when the reception result for at least one CBG is a NACK. If the uplink data is based on downlink control information (DCI) that schedules the uplink data and the radio network temporary identifier (RNTI) associated with the DCI is a configured scheduling-RNTI (CS-RNTI), the second information indicates an ACK when the reception result for all of the one or more CBGs is an ACK, and indicates a NACK when the reception result for at least one CBG is a NACK. If the uplink data is based on the DCI that schedules the uplink data and the radio network temporary identifier (RNTI) associated with the DCI is a configured scheduling-RNTI, the second information indicates an ACK when the reception result for all of the one or more CBGs is an ACK, and indicates a NACK when the reception result for at least one CBG is a NACK. A base station characterized in that, when the RNTI is a C-RNTI (cell-RNTI), the second information indicates an ACK when the reception result for at least one CBG is an ACK, and indicates a NACK when the reception results for all of the one or more CBGs are NACKs. Claim 11 delete Claim 12 delete

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