Method, device and system for uplink transmission and downlink reception in a wireless communication system

Abstract

The present invention relates to a method, device, and system for uplink transmission and downlink reception in a wireless communication system. The present invention relates to a method for transmitting and receiving radio signals by a terminal in a wireless communication system. According to the present specification, a method is disclosed, comprising the steps of: determining whether transmission of an uplink radio signal or reception of a downlink radio signal allocated to a terminal is possible in a time slot configured to include at least one of one or more downlink symbols for downlink transmission, one or more flexible symbols, and one or more uplink symbols for uplink transmission; and controlling the transmission of the uplink radio signal or reception of the downlink radio signal based on the determination. According to the present invention, the terminal can transmit an uplink radio signal even if the configuration of the time slot is changed, thereby preventing omission of uplink radio signal transmission or unnecessary retransmission of the uplink radio signal. Furthermore, by defining effective timing of uplink signals such as a physical random access channel, the frequency efficiency of the network can be increased and the energy consumption of the terminal can be reduced.

Description

[0001] This application is a divisional application of the patent application with application number 201880069046.5 (PCT / KR2018 / 010647) filed on April 23, 2020, with an international filing date of September 11, 2018, and the invention name being “Method, device and system for uplink transmission and downlink reception in a wireless communication system”. Technical Field

[0002] The present invention relates to wireless communications, and more particularly, to methods, devices, and systems for transmitting uplink signals and channels and receiving downlink signals and channels in a wireless communication system. Background Art

[0003] Following the commercialization of the fourth-generation (4G) communication system, efforts are underway to develop a new fifth-generation (5G) communication system to meet the growing demand for wireless data services. The 5G communication system is referred to as a network communication system that surpasses 4G, a post-LTE system, or a new radio (NR) system. To achieve high data transmission rates, the 5G communication system includes systems operating in millimeter wave (mmWave) bands of 6 GHz or higher, and in terms of ensuring coverage, includes communication systems operating in bands of 6 GHz or lower, leading to consideration for implementation in base stations and terminals.

[0004] The 3rd Generation Partnership Project (3GPP) NR system enhances the spectrum efficiency of the network and enables communications providers to offer more data and voice services over a given bandwidth. Therefore, in addition to supporting large amounts of voice, the 3GPP NR system is also designed to meet the needs of high-speed data and media transmission. The advantages of the NR system are higher throughput and lower latency on the same platform, support for frequency division duplex (FDD) and time division duplex (TDD), and lower operating costs with an enhanced end-user environment and simple architecture.

[0005] For more efficient data processing, the dynamic TDD of the NR system can use a method for changing the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and downlink according to the data traffic direction of the cell user. For example, when the downlink traffic of the cell is greater than the uplink traffic, the base station can allocate multiple downlink OFDM symbols to the time slot (or subframe). Information about the time slot configuration should be sent to the terminal.

[0006] To mitigate radio wave path loss and increase the transmission range of radio waves in the millimeter wave band, 5G communication systems are exploring beamforming, massive multiple input / output (massive MIMO), full-scale MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming that combines analog and digital beamforming, and massive antenna technologies. Furthermore, to systematically improve networks, 5G communication systems are developing technologies related to evolved small cells, advanced small cells, cloud radio access networks (Cloud RAN), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything (V2X), wireless backhaul, non-terrestrial network communication (NTN), mobile networks, cooperative communications, coordinated multipoint (CoMP), and interference cancellation. Furthermore, in 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) are being developed as advanced coding and modulation (ACM) schemes, as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced connectivity technologies.

[0007] At the same time, the Internet has evolved into an Internet of Things (IoT) network, a human-centric connected network where people generate and consume information. This network exchanges information between distributed components such as objects. The Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connections to cloud servers, is also emerging. Implementing the IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. Therefore, in recent years, technologies such as sensor networks, machine-to-machine (M2M), and machine-type communication (MTC) have been studied for connecting objects. Within the IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects to create new value in human life. Through the integration and hybridization of existing information technology (IT) and various industries, the IoT can be applied to areas such as smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart appliances, and advanced medical services.

[0008] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M), and machine-type communications (MTC) are being implemented through technologies such as beamforming, MIMO, and array antennas. Cloud RAN, as an application of the aforementioned big data processing technology, is an example of the convergence of 5G and IoT technologies. Mobile communication systems have generally been developed to provide voice services while ensuring user activity.

[0009] However, mobile communication systems are gradually expanding not only voice but also data services, and have now developed to the point where high-speed data services are provided. However, in the mobile communication systems currently providing services, due to resource shortages and users' demand for high-speed services, more advanced mobile communication systems are needed.

[0010] In the 3GPP NR system, a dynamic time division duplex (TDD) scheme can be used, which can freely change the direction of the OFDM symbol of the configured time slot according to the downlink and downlink traffic of the small cell. The base station transmits information related to the time slot configuration to the terminal to support dynamic TDD. However, there may be a problem that the terminal does not receive the time slot configuration information or there may be a problem that the terminal cannot perform operations due to the change of the time slot configuration, so a method for improving this problem is required. Summary of the Invention

[0011] Technical issues

[0012] The present invention provides a method, device and system for transmitting and receiving a control channel in a wireless communication system.

[0013] The present invention also provides a terminal for transmitting or receiving a control channel in case that a slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols is changed, and an operating method thereof.

[0014] The present invention also provides a base station for receiving or transmitting a control channel in case that a slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols is changed, and an operating method thereof.

[0015] The present invention also provides a terminal for efficiently transmitting or receiving a control channel in consideration of a switching gap in a slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols, and an operating method thereof.

[0016] The present invention also provides a base station for efficiently receiving or transmitting a control channel in consideration of a switching gap in a slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols, and an operating method thereof.

[0017] Technical Solution

[0018] According to an exemplary embodiment of the present invention, a user equipment (UE) for controlling uplink transmission and downlink reception in a wireless communication system is provided. The UE includes a communication module configured to transmit an uplink radio signal to a base station or receive a downlink radio signal of a base station assigned to a terminal from the base station; a memory configured to store a control program and data used in the terminal; and a processor configured to determine whether the transmission of an uplink radio signal or the reception of a downlink radio signal assigned to the terminal is available in a time slot configured to include at least one downlink symbol for downlink transmission and at least one flexible symbol for sending downlink transmission, and at least one uplink symbol for uplink transmission, and control the reception of the downlink radio signal and the transmission of the uplink radio signal based on the determination.

[0019] In one aspect, the uplink radio signal includes a physical uplink control channel (PUCCH), and when the number of uplink symbols is a predetermined number or more, or when the sum of the number of uplink symbols and the number of flexible symbols is a certain number or more, the processor can determine that transmission of the physical uplink control channel is available.

[0020] On the other hand, when the number of symbols required for transmission of a physical uplink control channel (hereinafter, symbols used for PDCCH transmission) is greater than the number of uplink symbols or the sum of the number of uplink symbols and the number of flexible symbols, the processor may control to discard the physical uplink control channel, convert the physical uplink control channel into another type of physical uplink control channel requiring fewer symbols, or transmit the physical uplink control channel on at least one time slot after the time slot.

[0021] On the other hand, the uplink radio signal includes a physical uplink control channel (PUCCH) and HARQ-ACK is mapped to the PUCCH, and when the downlink symbol overlaps with the symbol used for PDCCH transmission, the processor can determine that the transmission of HARQ-ACK is unavailable or postpone the transmission of HARQ-ACK.

[0022] On the other hand, the downlink radio signal includes a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and when the number of downlink symbols is a predetermined number or more, or when the sum of the number of downlink symbols and the number of flexible symbols is equal to a certain number or more, the processor can determine that transmission of the physical downlink shared channel or the physical downlink control channel is available.

[0023] On the other hand, the downlink radio signal is downlink control information (DCI) included in the physical downlink control channel (PDCCH), and the types of downlink control information include HARQ-ACK, rank indicator (RI) and CSI, and the processor can determine whether reception of the downlink radio signal is available based on priority according to the type of downlink control information.

[0024] In another aspect, the downlink radio signal includes an SS / PBCH block, and the uplink radio signal may include at least one of a physical uplink control channel, a physical uplink common channel, and a physical random access channel (PRACH).

[0025] On the other hand, when transmission of the uplink radio signal starts after a predetermined number of gap symbols from the last symbol of symbols for transmission of the downlink radio signal among downlink symbols, the processor may perform transmission of the uplink radio signal.

[0026] On the other hand, when transmission of the uplink radio signal overlaps with at least one of the last symbol of symbols used for transmission of the downlink radio signal among the downlink symbols and a predetermined number of gap symbols, the processor may discard transmission of the uplink radio signal.

[0027] In another aspect, the time slot is configured by information about time slot configuration provided by the base station, and the time slot configuration information may include at least one of a cell-specific RRC message generated in the RRC layer, a UE-specific RRC message, and dynamic time slot format information generated in the physical layer.

[0028] According to another aspect of the present invention, a method for transmitting and receiving radio signals by a terminal in a wireless communication system is provided. The method includes determining whether transmission of an uplink radio signal or reception of a downlink radio signal allocated to the terminal is available; and controlling transmission of the uplink radio signal or reception of the downlink radio signal based on the determination in a time slot configured to include at least one downlink symbol for downlink transmission, at least one flexible symbol, and at least one uplink symbol for uplink transmission.

[0029] On the one hand, the uplink radio signal includes a physical uplink control channel (PUCCH), and the control may include: sending the physical uplink control channel when the number of uplink symbols is a predetermined number or more, or when the sum of the number of uplink symbols and the number of flexible symbols is a certain number or more.

[0030] On the other hand, when the number of symbols required for transmission of a physical uplink control channel (hereinafter, symbols used for PDCCH transmission) is greater than the number of uplink symbols or the sum of the number of uplink symbols and the number of flexible symbols, the control may include: discarding the physical uplink control channel, converting the physical uplink control channel to another type of physical uplink control channel requiring fewer symbols, or sending the physical uplink control channel on at least one time slot after the time slot.

[0031] On the other hand, the uplink radio signal includes a physical uplink control channel (PUCCH) and HARQ-ACK is mapped to the PUCCH, and the control may include: determining that the transmission of HARQ-ACK is unavailable or postponing the transmission of HARQ-ACK when the downlink symbol overlaps with the symbol used for PDCCH transmission.

[0032] On the other hand, the downlink radio signal includes a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and when the number of downlink symbols is a predetermined number or more, or when the sum of the number of downlink symbols and the number of flexible symbols is equal to a certain number or more, the control may include: sending the physical downlink shared channel or the physical downlink control channel.

[0033] On the other hand, the downlink radio signal is downlink control information (DCI) included in the physical downlink control channel (PDCCH), and the types of downlink control information include HARQ-ACK, rank indicator (RI) and CSI, and the control can determine whether the reception of the downlink radio signal is available based on the priority according to the type of the downlink control information.

[0034] In another aspect, the downlink radio signal includes an SS / PBCH block, and the uplink radio signal may include at least one of a physical uplink control channel, a physical uplink common channel, and a physical random access channel (PRACH).

[0035] On the other hand, when transmission of the uplink radio signal starts after a predetermined number of gap symbols from the last symbol of symbols used for transmission of the downlink radio signal among the downlink symbols, the controlling may include transmitting the uplink radio signal.

[0036] On the other hand, when transmission of the uplink radio signal overlaps with at least one of a last symbol of symbols used for transmission of the downlink radio signal among downlink symbols and a predetermined number of gap symbols, the controlling may include discarding transmission of the uplink radio signal.

[0037] In another aspect, the time slot is configured by information about time slot configuration provided by the base station, and the time slot configuration information may include at least one of a cell-specific RRC message generated in the RRC layer, a UE-specific RRC message, and dynamic time slot format information generated in the physical layer.

[0038] According to another aspect of the present invention, a terminal for performing uplink transmission and downlink reception in a wireless communication system is provided. The terminal includes a communication module configured to transmit an uplink radio signal to a base station or receive a downlink radio signal from the base station; and a processor configured to determine whether transmission of the uplink radio signal or reception of the downlink radio signal is valid in a time slot in which at least one of downlink symbols for downlink transmission, flexible symbols, and uplink symbols for uplink transmission is configured, and perform transmission of the uplink radio signal or reception of the downlink radio signal based on the determination.

[0039] In one aspect, the processor may perform transmission of the uplink radio signal when, in a time slot, the first symbol among the symbols to which the uplink radio signal is allocated starts after a predetermined number of symbols from the last symbol of the downlink symbol or the symbol allocated for reception of the downlink radio signal.

[0040] On the other hand, when, in a time slot, the first symbol among the symbols to which the uplink radio signal is allocated overlaps with a downlink symbol, a symbol allocated for reception of a downlink radio signal, or at least one of a predetermined number of symbols after the last symbol of the symbol, the processor may not perform transmission of the uplink radio signal.

[0041] In another aspect, the uplink radio signal includes at least one of a physical uplink control channel, a physical uplink shared channel, a physical random access channel, and a sounding reference signal (SRS).

[0042] On the other hand, at least one of the symbols to which the uplink radio signal is allocated may be a flexible symbol.

[0043] In another aspect, the downlink radio signal may include at least one of a synchronization signal / physical broadcast channel (SS / PBCH) block, a physical downlink shared channel, a physical downlink control channel, or a channel state information reference signal (CSI-RS).

[0044] On the other hand, the unperformed uplink radio signal is a physical uplink control channel, and the processor may convert the physical uplink control channel into another type of physical uplink control channel in which transmission in the time slot is valid, and transmit the another type of physical uplink control channel, or perform transmission in the first time slot among multiple time slots in which transmission after the time slot is valid.

[0045] On the one hand, the processor may perform reception of a downlink radio signal when the last symbol among the symbols to which the downlink radio signal is allocated in the time slot ends before a predetermined number of symbols from the uplink symbol or the first symbol among the symbols allocated for transmission of the uplink radio signal.

[0046] On the other hand, when the last symbol among the symbols to which the downlink radio signal is allocated in the time slot overlaps with at least one of the uplink symbol, the symbol allocated for transmission of the uplink radio signal, or a predetermined number of symbols before the first symbol of the symbol, the processor may not perform reception of the downlink radio signal.

[0047] In another aspect, the downlink radio signal may include at least one of a physical downlink shared channel, a physical downlink control channel, or a channel state information reference signal (CSI-RS).

[0048] On the other hand, at least one of the symbols to which the downlink radio signal is allocated may be a flexible symbol.

[0049] In another aspect, the uplink radio signal may be a physical random access channel.

[0050] On the other hand, the time slot is configured by information about the time slot configuration provided by the base station, and the information about the time slot configuration may include at least one of a cell-specific RRC message generated in the RRC layer, a UE-specific RRC message, or dynamic time slot format information generated in the physical layer.

[0051] According to another aspect of the present invention, a method for performing uplink transmission and downlink reception by a terminal in a wireless communication system is provided. The method includes determining whether transmission of an uplink radio signal or reception of a downlink radio signal is valid in a time slot in which at least one of a downlink symbol for downlink transmission, a flexible symbol, and an uplink symbol for uplink transmission is configured, and performing transmission of the uplink radio signal or reception of the downlink radio signal based on the determination.

[0052] In one aspect, transmission of an uplink radio signal may be performed when, in a time slot, the first symbol among the symbols to which the uplink radio signal is allocated starts after a predetermined number of symbols from the last symbol of the downlink symbol or the symbols allocated for reception of the downlink radio signal.

[0053] On the other hand, when the first symbol among the symbols to which the uplink radio signal is allocated in the time slot overlaps with at least one of a downlink symbol, a symbol allocated for receiving the downlink radio signal, or a predetermined number of symbols after the last symbol of the symbol, transmission of the uplink radio signal may not be performed.

[0054] In another aspect, the uplink radio signal includes at least one of a physical uplink control channel, a physical uplink shared channel, a physical random access channel, and a sounding reference signal (SRS).

[0055] On the other hand, at least one of the symbols to which the uplink radio signal is allocated may be a flexible symbol.

[0056] In another aspect, the downlink radio signal may include at least one of a synchronization signal / physical broadcast channel (SS / PBCH) block, a physical downlink shared channel, a physical downlink control channel, or a channel state information reference signal (CSI-RS).

[0057] On the other hand, the unimplemented uplink radio signal is a physical uplink control channel, and the physical uplink control channel can be converted into another type of physical uplink control channel in which transmission is valid in the time slot and transmitted, or can be transmitted in the first time slot among the time slots in which transmission is valid after the time slot.

[0058] On the one hand, reception of a downlink radio signal may be performed when, in a time slot, the last symbol among the symbols to which the downlink radio signal is allocated ends before a predetermined number of symbols from the first symbol of the uplink symbol or symbols allocated for transmission of the uplink radio signal.

[0059] On the other hand, when, in a time slot, the last symbol among the symbols to which the downlink radio signal is allocated overlaps with an uplink symbol, a symbol allocated for transmission of the uplink radio signal, or at least one of a predetermined number of symbols before the first symbol of the symbol, reception of the downlink radio signal may not be performed.

[0060] In another aspect, the downlink radio signal may include at least one of a physical downlink shared channel, a physical downlink control channel, or a channel state information reference signal (CSI-RS).

[0061] On the other hand, at least one of the symbols to which the downlink radio signal is allocated may be a flexible symbol.

[0062] In another aspect, the uplink radio signal may be a physical random access channel.

[0063] On the other hand, the time slot is configured by information about the time slot configuration provided by the base station, and the information about the time slot configuration may include at least one of a cell-specific RRC message generated in the RRC layer, a UE-specific RRC message, or dynamic time slot format information generated in the physical layer.

[0064] Beneficial effects

[0065] According to the present invention, even if the configuration of the time slot changes, the terminal can still send PUCCH, thereby preventing PUCCH transmission abandonment or unnecessary PUCCH retransmission. In addition, by defining the effective timing of uplink signals such as PRACH, the frequency efficiency of the network can be increased and the energy consumption of the terminal can be reduced.

[0066] Effects obtainable from various embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above can be clearly derived and understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 illustrates an example of a radio frame structure used in a wireless communication system;

[0068] Figure 2 An example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system is illustrated;

[0069] Figure 3 is a schematic diagram for explaining physical channels used in a 3GPP system and a typical signal transmission method using the physical channels;

[0070] FIG4 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system;

[0071] FIG5 illustrates a process for transmitting control information and control channels in a 3GPP NR system;

[0072] Figure 6 FIGURE 1 illustrates a control resource set (CORESET) in which a physical downlink control channel (PUCCH) may be transmitted in a 3GPP NR system;

[0073] Figure 7 A method for configuring a PDCCH search space in a 3GPP NR system is illustrated;

[0074] Figure 8 is a conceptual diagram illustrating carrier aggregation;

[0075] Figure 9 It is a schematic diagram for explaining signal carrier communication and multi-carrier communication;

[0076] Figure 10 is a schematic diagram illustrating an example of applying a cross-carrier scheduling technology;

[0077] Figure 11 is a diagram illustrating a time slot configuration of a TDD-based mobile communication system.

[0078] 12 is a diagram illustrating a physical uplink control channel (PUCCH) used in a wireless communication system according to an example.

[0079] Figure 13 is a diagram illustrating a method of transmitting a PUCCH in a time slot.

[0080] FIG. 14 is a diagram illustrating an example of transmitting a PUCCH to another slot as the slot configuration changes.

[0081] FIG15 is a diagram illustrating time slots in which repeated PUCCHs are transmitted according to time slot configuration.

[0082] FIG16 shows whether to transmit the PUCCH according to the slot configuration.

[0083] Figure 17 are block diagrams respectively showing configurations of a terminal and a base station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0084] The terms used in this specification are generally used, and these are currently used as broadly as possible based on the functions of the present invention. However, these terms may be changed according to the intentions, customs, and new technologies of those skilled in the art. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in such cases, their meanings will be described in the corresponding description of the present invention. Therefore, it is intended that the terms used in this specification should be analyzed not only based on the names of the terms, but also based on the substantive meaning of the terms and content in the specification.

[0085] Throughout the specification and the claims that follow, when an element is described as being “connected” to another element, the element may be “directly connected” to the other element or “electrically connected” to the other element through a third element. Furthermore, unless explicitly stated otherwise, the word “comprising” will be understood to imply the inclusion of the stated elements but not the exclusion of any other elements unless otherwise specified. Furthermore, in some exemplary embodiments, limitations such as “greater than or equal to” or “less than or equal to” based on specific thresholds may be appropriately replaced with “greater than” or “less than”, respectively.

[0086] The following technologies can be used in various wireless access systems, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier-FDMA (SC-FDMA), etc. CDMA can be implemented through radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA can be implemented through radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates (EDGE) GSM Evolution. OFDMA can be implemented through radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), and LTE Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A and is a system for supporting enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and massive machine type communication (mMTC) services, which are requirements of IMT-2020. For the sake of clarity, 3GPP NR is mainly described, but the technical concept of the present invention is not limited thereto.

[0087] Unless otherwise specified in this specification, a base station may refer to a next-generation node B (gNB) defined in 3GPP NR. In addition, unless otherwise explained, a terminal may refer to a user equipment (UE).

[0088] Figure 1 An example of a radio frame structure used in a wireless communication system is shown. Figure 1 , a radio frame (or radio frame) used in a 3GPP NR system may have a length of 10 ms (Δf max N f / 100)*Tc ). In addition, a radio frame includes 10 subframes (SFs) of equal size. Here, Δf max =480*10 3 Hz, N f =4096, T c =1 / (Δf ref *N f,ref ), Δf ref =15*10 3 Hz, and N f,ref =2048. Numbers from 0 to 9 can be assigned to 10 subframes within a radio frame. Each subframe has a length of 1ms and can include one or more time slots according to the subcarrier spacing. More specifically, in the 3GPP NR system, the subcarrier spacing that can be used is 15*2 μ kHz, and μ can have values ​​of μ=0, 1, 2, 3, 4 as subcarrier spacing configurations. That is, 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz can be used for subcarrier spacing. One subframe with a length of 1ms can include 2 μ In this case, the length of each time slot is 2 -μ ms. From 0 to 2 μ-1 The numbers can be assigned to the 2 μ time slots. In addition, 0 to 10*2 μ Numbers of -1 may be allocated to time slots within a subframe, respectively. Time resources may be distinguished by at least one of a radio frame number (also referred to as a radio frame index), a subframe number (also referred to as a subframe index), and a time slot number (or time slot index).

[0089] Figure 2 An example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system is shown. In particular, Figure 2 The structure of the resource grid of the 3GPP NR system is shown. There is one resource grid for each antenna port. Figure 2 A slot includes multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and multiple Resource Blocks (RBs) in the frequency domain. An OFDM symbol also refers to a symbol section. Unless otherwise specified, an OFDM symbol may be referred to simply as a symbol. Hereinafter, in this specification, a symbol includes an OFDM symbol, an SC-FDMA symbol, a DFTs-OFDM symbol, and the like.

[0090] refer to Figure 2 , the signal transmitted from each time slot can be composed of N size,μ grid,x *N RBsc subcarriers and N slot symb Here, when the signal is a DL signal, x=DL, and when the signal is a UL signal, x=UL. N size,μ grid,x represents the number of resource blocks (RBs) that make up μ (x is DL or UL) according to the subcarrier spacing, and N slot symb N represents the number of OFDM symbols in a time slot. RB sc is the number of subcarriers that make up one RB and N RB sc = 12. Depending on the multiple access scheme, an OFDM symbol may be called a cyclically shifted OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol.

[0091] The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot includes 14 OFDM symbols, but in the case of an extended CP, one slot may include 12 OFDM symbols. In a specific embodiment, the extended CP may be used only with a 60kHz subcarrier spacing. Figure 2 In the embodiment, for the convenience of description, one time slot is configured with 14 OFDM symbols as an example, but the embodiments of the present invention can be applied in a similar manner to time slots with different numbers of OFDM symbols. Figure 2 , each OFDM symbol includes N in the frequency domain size ,μ grid,x *N RB sc Subcarriers. Subcarrier types can be divided into data subcarriers used for data transmission, reference signal subcarriers used for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0092] An RB can be located as N in the frequency domain RB sc For example, 12 consecutive subcarriers. For reference, a resource configured with one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB can be configured with N slot symb *N RB sc rc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) in a time slot. k can be an integer from 0 to N in the frequency domain. size,μgrid,x *N RB sc –1 assigned index, and l can be from 0 to N in the time domain slot symb –1 assigned index.

[0093] In order for a UE to receive or transmit signals from or to a base station, the UE's time / frequency may be synchronized with that of the base station. This is because when the base station and UE are synchronized, the UE can determine the time and frequency parameters required to demodulate downlink signals and transmit uplink signals at the correct time.

[0094] Each symbol of a radio frame used in time division duplex (TDD) or unpaired spectrum can be configured with at least one of a DL symbol, a UL symbol, and a flexible symbol. A radio frame that can be used as a DL carrier in frequency division duplex (FDD) or paired spectrum can be configured with a DL symbol or a flexible symbol, while a radio frame used as a UL carrier can be configured with a UL symbol or a flexible symbol. In a DL symbol, DL transmission is possible, but UL transmission is not possible. In a UL symbol, UL transmission is possible, but DL transmission is not possible. Flexible symbols can be determined to be used as DL or UL based on a signal.

[0095] Information about the type of each symbol, that is, information indicating any one of a DL symbol, a UL symbol, and a flexible symbol, may be configured with a cell-specific or common radio resource control (RRC) signal. In addition, information about the type of each symbol may be additionally configured with a UE-specific or dedicated RRC signal. The base station notifies, by using a cell-specific RRC signal, i) the period of the cell-specific time slot configuration, ii) the number of time slots having only DL symbols from the start of the period of the cell-specific time slot configuration, iii) the number of DL symbols starting from the first symbol of the time slot immediately following the time slot having only DL symbols; iv) the number of time slots having only UL symbols starting from the end of the period of the cell-specific time slot configuration; and v) the number of UL symbols starting from the last symbol of the time slot immediately preceding the time slot having only UL symbols. Here, a symbol not configured with either a UL symbol or a DL symbol is a flexible symbol.

[0096] When the information about the symbol type is configured with a UE-specific RRC signal, the base station can signal whether the flexible symbol is a DL symbol or a UL symbol in the cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change the DL symbol or UL symbol configured with the cell-specific RRC signal to another symbol type. The UE-specific RRC signal can signal the N of the corresponding time slot for each time slot. slot symbThe number of DL symbols among the symbols, and N of the corresponding time slot slot symb The number of UL symbols among the symbols. In this case, the DL symbols of the time slot can be continuously configured from the first symbol to the i-th symbol of the time slot. In addition, the UL symbols of the time slot can be continuously configured from the j-th symbol to the last symbol of the time slot (where i < j). In the time slot, the symbols that are not configured with either the UL symbol or the DL symbol are flexible symbols.

[0097] The type of symbol configured with the above-mentioned RRC signal can be called a semi-static DL / UL configuration. In the semi-static DL / UL configuration previously configured with the RRC signal, the flexible symbol can be indicated by the dynamic slot format information (SFI) sent on the physical DL control channel (PDCCH) through the DL symbol, UL symbol or flexible symbol. In this case, the DL symbol or UL symbol configured with the RRC signal will not be changed to another symbol type. Table 1 illustrates the dynamic SFI that the base station can indicate to the UE.

[0098] [Table 1]

[0099]

[0100] In Table 1, D represents a DL symbol, U represents a UL symbol, and X represents a flexible symbol. As shown in Table 1, a maximum of two DL / UL switches may be allowed in one slot.

[0101] Figure 3 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels. If the power of the UE is turned on or the UE resides in a new cell, the UE performs an initial cell search (S101). Specifically, the UE can synchronize with the BS in the initial cell search. To this end, the UE can receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0102] After completing the initial cell search, the UE receives the physical downlink shared channel (PDSCH) according to the physical downlink control channel (PDCCH) and information in the PDCCH, so that the UE can obtain more specific system information than the system information obtained through the initial cell search (S102).

[0103] When the UE initially accesses the base station or does not have radio resources for signal transmission, the UE may perform a random access procedure on the base station (operations S103 to S106). First, the UE may send a preamble through a physical random access channel (PRACH) (S103) and receive a response message for the preamble from the base station through a PDCCH and a corresponding PDSCH (S104). When the UE receives a valid random access response message, the UE sends data including the UE's identifier, etc. to the base station through a physical uplink shared channel (PUSCH) indicated by an UL grant sent from the base station by the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication of the base station for conflict resolution. If the UE successfully receives the PDCCH (S106) through the UE's identifier, the random access procedure terminates.

[0104] After the above process, the UE receives PDCCH / PDSCH (S107) and sends physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a normal UL / DL signal transmission process. In particular, the UE can receive downlink control information (DCI) through PDCCH. DCI may include control information, such as resource allocation information for the UE. In addition, the format of DCI may vary depending on the intended use. The uplink control information (UCI) sent by the UE to the base station through UL includes DL / UL ACK / NACK signals, channel quality indicator (CQI), precoding matrix index (PMI), rank indicator (RI), etc. Here, CQI, PMI and RI may be included in channel state information (CSI). In the 3GPP NR system, the UE can send control information such as the above-mentioned HARQ-ACK and CSI through PUSCH and / or PUCCH.

[0105] Figure 4 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. When the power is turned on or when the UE wants to access a new cell, it can obtain time and frequency synchronization with the cell and perform an initial cell search procedure. The UE can detect the physical cell identifier N of the cell during the cell search procedure. cell ID To this end, the UE may receive synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station and synchronize with the base station. In this case, the UE may obtain information such as a cell identifier (ID).

[0106] With reference to Figure 4A, the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into PSS and SSS. PSS can be used to obtain time domain synchronization and / or frequency domain synchronization, such as OFDM symbol synchronization and time slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. With reference to Figure 4A and Table 2, the SS / PBCH block can be configured with 20 consecutive RBs (=240 subcarriers) on the frequency axis and can be configured with 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is sent in the first OFDM symbol through the 56th to 182nd subcarriers, and the SSS is sent in the third OFDM symbol. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol in which the PSS is sent, the base station does not send signals through the remaining subcarriers (i.e., the 0th to 55th and 183rd to 239th subcarriers). In addition, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals through subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) through the remaining REs except the above signals in the SS / PBCH block.

[0107] [Table 2]

[0108]

[0109] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups through the combination of three PSSs and SSSs. Each group includes three unique identifiers. Specifically, each physical layer cell ID is only part of one physical layer cell identifier group. Therefore, the physical layer cell ID N cell ID =3N (1) ID +N (2) ID The physical layer cell identifier group may be represented by an index N ranging from 0 to 335. (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier in the physical layer cell identifier group (2) ID Uniquely defined. The UE can detect the PSS and identify one of the three unique physical layer identifiers. In addition, the UE can detect the SSS and identify one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS PSS (n) is shown in Equation 1 below.

[0110] [Equation 1]

[0111] d PSS (n) = 1-2x(m)

[0112]

[0113] Here, 0≤n<127, and x(m) is as shown in Equations 2 and 3 below.

[0114] [Equation 2]

[0115] x(i+7)=(x(i+4)+x(i))mod2,

[0116] [Equation 3]

[0117] [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0118] In addition, the sequence d of SSS sss (n) is shown in Equation 4.

[0119] [Equation 4]

[0120] d sss (n)=[1-2x0((n+m0)mod127)][1-2x1((n+m1)mod127]

[0121]

[0122] Here, 0≤n<127, and x0(m), x1(m) are as shown in the following equations 5 and 6.

[0123] [Equation 5]

[0124] x0(i+7)=(x0(i+4)+x0(i))mod2

[0125] x1(i+7)=(x1(i+4)+x1(i))mod2

[0126] [Equation 6]

[0127] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1]

[0128] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1].

[0129] A radio frame having a length of 10 ms can be divided into two half-frames having a length of 5 ms. Referring to FIG4B , the time slot in which the SS / PBCH block is transmitted in each half-frame will be described. The time slot in which the SS / PBCH block is transmitted may be any of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the starting time point of the SS / PBCH block is the ({2, 8}+14*n)th symbol. In this case, n=0 or 1 at a carrier frequency of 3 GHz or less. In addition, at a carrier frequency higher than 3 GHz and lower than 6 GHz, it may be n=0, 1, 2, 3. In case B, the subcarrier spacing is 30 kHz, and the starting time point of the SS / PBCH block is {4, 8, 16, 20}+28*n. In this case, n=0 at a carrier frequency of 3 GHz or less. In addition, at a carrier frequency higher than 3 GHz and lower than 6 GHz, it may be n=0, 1. In case C, the subcarrier spacing is 30 kHz, and the start time point of the SS / PBCH block is the ({2, 8} + 14*n)th symbol. In this case, n = 0 or 1 at a carrier frequency of 3 GHz or lower. In addition, at a carrier frequency higher than 3 GHz and lower than 6 GHz, it may be n = 0, 1, 2, 3. In case D, the subcarrier spacing is 120 kHz, and the start time point of the SS / PBCH block is the ({4, 8, 16, 20} + 28*n)th symbol. In this case, at a carrier frequency of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the subcarrier spacing is 240 kHz, and the start time point of the SS / PBCH block is the ({8, 12, 16, 20, 32, 36, 40, 44} + 56*n)th symbol. In this case, at a carrier frequency of 6 GHz or higher, n=0, 1, 2, 3, 5, 6, 7, 8.

[0130] Figure 5 illustrates a process for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5A, the base station may add a cyclic redundancy check (CRC) masked with a radio network temporary identifier (RNTI) (e.g., an XOR operation) to the control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs may include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). In addition, the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI), a CS-RNTI, or an MCS-C-RNTI. Thereafter, the base station may perform rate matching based on the amount of resources used for PDCCH transmission after performing channel coding (e.g., polarity coding) (S206). Thereafter, the base station may multiplex DCI based on a PDCCH structure based on control channel elements (CCEs) (S208). In addition, the base station may apply additional processing (S210) such as scrambling, modulation (e.g., QPSK), interleaving, etc. to the multiplexed DCI, and then map the DCI to the resource to be transmitted. CCE is the basic resource unit for PDCCH, and one CCE may include multiple (e.g., six) resource element groups (REGs). One REG may be configured with multiple (e.g., 12) REs. The number of CCEs used for one PDCCH may be defined as an aggregation level. In a 3GPP NR system, an aggregation level of 1, 2, 4, 8, or 16 may be used. Figure 5B is a schematic diagram relating to the multiplexing of CCE aggregation levels and PDCCHs, and illustrates the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control region according to the aggregation level.

[0131] Figure 6The figure illustrates a control resource set (CORESET) in which the physical downlink control channel (PUCCH) can be transmitted in a 3GPP NR system. A CORESET is a time-frequency resource in which the PDCCH (i.e., the control signal of the UE) is transmitted. In addition, the search space described later can be mapped to one CORESET. Therefore, the UE can monitor the time-frequency domain designated as the CORESET instead of monitoring all frequency bands for PDCCH reception, and decode the PDCCH mapped to the CORESET. The base station can configure one or more CORESETs for each cell to the UE. The CORESET can be configured for up to three consecutive symbols on the time axis. In addition, the CORESET can be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of Figure 5, CORESET#1 is configured with consecutive PRBs, and CORESET#2 and CORESET#3 are configured with discontinuous PRBs. The CORESET can be located in any symbol in the time slot. For example, in the embodiment of FIG. 5 , CORESET#1 starts from the first symbol of the time slot, CORESET#2 starts from the fifth symbol of the time slot, and CORESET#9 starts from the ninth symbol of the time slot.

[0132] Figure 7 The figure illustrates a method for setting a PUCCH search space in a 3GPP NR system. In order to send a PDCCH to a UE, each CORESET may have at least one search space. In an embodiment of the present disclosure, a search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) through which the PDCCH of the UE can be sent. The search space may include a common search space that UEs of 3GPP NR need to search together, and a terminal-specific or UE-specific search space that a specific UE needs to search. In the common search space, the UE may monitor the set PDCCH so that all UEs in a cell belonging to the same base station search together. In addition, a UE-specific search space may be set for each UE so that the UE monitors the PDCCH allocated to each UE at a different search space position according to the UE. In the case of a UE-specific search space, due to the limited control region in which the PDCCH can be allocated, the search space between UEs may be partially overlapped and allocated. Monitoring the PDCCH includes blind decoding the PDCCH candidates in the search space. When blind decoding is successful, it may be expressed that the PDCCH is (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH is not detected / received or is not successfully detected / received.

[0133] For ease of explanation, a PDCCH that is scrambled with a group-common (GC) RNTI previously known to the UE so that downlink control information is sent to one or more UEs is referred to as a group-common (GC) PDCCH or a common PDCCH. Additionally, a PDCCH that is scrambled with a specific terminal RNTI known to a specific UE so that uplink scheduling information or downlink scheduling information is sent to a specific UE is referred to as a UE-specific PDCCH. A common PDCCH may be included in a common search space, and a UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0134] The base station can signal information related to resource allocation of the paging channel (PCH) and downlink shared channel (DL-SCH) as transport channels (i.e., DL grant) or information related to resource allocation of UL-SCH and hybrid automatic repeat request (HARQ) (i.e., UL grant) to each UE or UE group through the PDCCH. The base station can transmit PCH transport blocks and DL-SCH transport blocks through the PDSCH. The base station can transmit data that does not include specific control information or specific service data through the PDSCH. In addition, the UE can receive data that does not include specific control information or specific service data through the PDSCH.

[0135] The base station can include information about which UE (one or more UEs) to send PDSCH data to and how the corresponding UE receives and decodes PDSCH data in the PDCCH, and send the PDCCH. For example, assume that the DCI sent to a specific PDCCH is a CRC masked with the RNTI of "A", and the DCI indicates that the PDSCH is allocated to the radio resources (e.g., frequency position) of "B" and indicates the transmission format information of "C" (e.g., transport block size, modulation scheme, coding information, etc.). The UE monitors the PDCCH using the RNTI information that the UE has. In this case, if there is a UE that performs blind decoding of the PDCCH through the "A" RNTI, the UE receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0136] Table 3 shows an embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0137] [Table 3]

[0138]

[0139] The PUCCH may be used to transmit the following UL control information (UCI).

[0140] - Scheduling Request (SR): information for requesting UL UL-SCH resources.

[0141] -HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether the information sent on the PDCCH or PDSCH is received. HARQ-ACK responses include positive ACK (simple ACK), negative ACK (hereinafter referred to as NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. Generally, ACK can be represented by a bit value of 1, while NACK can be represented by a bit value of 0.

[0142] - Channel State Information (CSI): Feedback information about the DL channel. The UE generates feedback information about the DL channel based on the CSI Reference Signal (RS) transmitted by the base station. Feedback information related to Multiple Input Multiple Output (MIMO) includes the Rank Indicator (RI) and the Precoding Matrix Indicator (PMI). Based on the information indicated by the CSI, the CSI can be divided into CSI Part 1 and CSI Part 2.

[0143] In the 3GPP NR system, five PUCCH formats can be used to support various service scenarios, various channel environments and frame structures.

[0144] PUCCH format 0 is a format that can transmit 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence on the two symbols can be transmitted through different RBs. Through this, the UE can obtain frequency diversity gain. In more detail, the UE can transmit PUCCH format 0 according to the M bit Bit UCI(M bit =1 or 2) to determine the cyclic shift value m cs and can transmit a base sequence of length 12 cyclically shifted to a predetermined value m by mapping the sequence to 12 REs of one OFDM symbol and one PRB cs When the number of cyclic shifts available to the terminal is 12 and M bit = 1, 1-bit UCI 0 and 1 can be represented by sequences corresponding to two cyclic shifts with a difference of 6 in cyclic shift value. bit =2, the 2-bit UCIs 00, 01, 11, and 10 can be represented by sequences corresponding to four cyclic shifts in which the difference in cyclic shift values ​​is 3.

[0145] PUCCH format 1 can transmit 1 or 2 bits of HARQ-ACK information or SR. PUCCH format 1 can be transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one of 4 to 14. More specifically, M bit =1 UCI is BPSK modulated. The UE can use quadrature phase shift keying (QPSK) to modulate M bit =2 UCI. The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. The UE spreads the even-numbered OFDM symbols of PUCCH format 1 allocated by the time axis orthogonal cover code (OCC) to transmit the obtained signal. PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB according to the length of the OCC used. The demodulation reference signal (DMRS) can be spread together with the OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0146] PUCCH format 2 can transmit more than 2 bits of UCI. PUCCH format 2 can be sent through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is sent in two OFDM symbols, the sequences sent in different RBs of the two OFDM symbols can be the same as each other. Through this, the UE can obtain frequency diversity gain. More specifically, M bit UCI (M bit >2) RBs that are bit-level scrambled, QPSK-modulated, and mapped to one or two OFDM symbols. Here, the number of RBs can be one of 1 to 16.

[0147] PUCCH format 3 or PUCCH format 4 can convey more than 2 bits of UCI. PUCCH format 3 or PUCCH format 4 can be transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 can be one of 4 to 14. Specifically, the UE modulates M with π / 2 binary phase shift keying (BPSK) or QPSK. bit UCI of Mbit (Mbit>2) to generate complex-valued symbols d(0) to d(Mbit) symb -1). Here, when π / 2-BPSK is used, M symb =M bit , and when using QPSK, M symb =M bit / 2. The UE may not apply block-based extension to PUCCH format 3. However, the UE may apply block-based extension to one RB (i.e., 12 subcarriers) using a PreDFT-OCC length of 12, so that PUCCH format 4 can have dual or quad multiplexing capabilities. The UE performs transmit precoding (or DFT precoding) on ​​the extended signal and maps it to each RE to transmit the extended signal.

[0148] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 can be determined based on the length of the UCI transmitted by the UE and the maximum coding rate. When the UE uses PUCCH format 2, the UE can transmit HARQ-ACK information and CSI information together through the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that can be used by PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE can transmit only the remaining UCI information instead of some UCI information based on the priority of the UCI information.

[0149] PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured via RRC signaling to indicate frequency hopping in a time slot. When frequency hopping is configured, the index of the RB to be hopped may be configured with the RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted via N OFDM symbols on the time axis, the first hop may have a lower limit of (N / 2) OFDM symbols and the second hop may have an upper limit of (N / 2) OFDM symbols.

[0150] PUCCH format 1, PUCCH format 3, or PUCCH format 4 can be configured to be repeatedly transmitted in multiple time slots. In this case, K time slots for repeated transmission of PUCCH can be configured through RRC signaling. The repeatedly transmitted PUCCH must start from an OFDM symbol at a constant position in each time slot and have a constant length. When one of the OFDM symbols of the time slot in which the UE should transmit the PUCCH is indicated as a DL symbol through RRC signaling, the UE may not transmit the PUCCH in the corresponding time slot and delay the transmission of the PUCCH to the next time slot to transmit the PUCCH.

[0151] At the same time, in the 3GPP NR system, the UE can perform transmission / reception using a bandwidth equal to or less than the bandwidth of the carrier (or cell). To this end, the UE can receive a bandwidth part (BWP) of continuous bandwidth configured with some bandwidth in the carrier bandwidth. A UE operating according to TDD or in an unpaired spectrum can receive up to four DL / UL BWP pairs in one carrier (or cell). In addition, the UE can activate one DL / UL BWP pair. A UE operating according to FDD or in a paired spectrum can receive up to four DL BWPs on a DL carrier (or cell) and up to four ULBWPs on a UL carrier (or cell). The UE can activate one DL BWP and one UL BWP for each carrier (or cell). Except for the activated BWP, the UE may not perform reception or transmission in the time-frequency resources. The activated BWP may be referred to as an active BWP.

[0152] The base station may indicate the activated BWP among the BWPs configured by the UE in downlink control information (DCI). The BWP indicated by the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station may include a bandwidth part indicator (BPI) in the DCI used to schedule PDSCH or PUSCH, which indicates the BWP to be activated to change the UE's DL / UL BWP pair. The UE may receive the DCI used to schedule PDSCH or PUSCH and may identify the DL / UL BWP pair activated based on the BPI. For a DL carrier (or cell) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI used to schedule PDSCH to change the UE's DL BWP. For a UL carrier (or cell) operating in FDD, the base station may include a BPI indicating the BWP to be activated in the DCI used to schedule PUSCH to change the UE's UL BWP.

[0153] Figure 8 This diagram illustrates the concept of carrier aggregation. Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells configured with UL resources (or component carriers) and / or DL ​​resources (or component carriers) as a single large logical frequency band, allowing the wireless communication system to utilize a wider frequency band. However, for ease of description, the term "component carrier" is used below.

[0154] refer to Figure 8 As an example of a 3GPP NR system, the entire system band may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically contiguous subcarriers. Figure 8, each component carrier is shown to have the same bandwidth, which is only an example, and each component carrier may have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other on the frequency axis, the drawings are shown logically, and each component carrier may be physically adjacent to each other or may be spaced apart.

[0155] A different center frequency can be used for each component carrier. Alternatively, a common center frequency can be used for physically adjacent component carriers. Figure 8 In the embodiment of FIG1 , all component carriers are physically adjacent, and center frequency A can be used in all component carriers. In addition, assuming that the component carriers are not physically adjacent to each other, center frequency A and center frequency B can be used in each component carrier.

[0156] When the entire system frequency band is extended by carrier aggregation, the frequency band used to communicate with each UE can be defined in units of component carriers. UE A can use 100 MHz as the entire system frequency band and perform communication using all five component carriers. UEs B1 to B5 can only use 20 MHz bandwidth and perform communication using one component carrier. UEs C1 and C2 can use 40 MHz bandwidth and perform communication using two component carriers respectively. These two component carriers can be logically / physically adjacent or non-adjacent. UE C1 represents the case of using two non-adjacent component carriers, and UE C2 represents the case of using two adjacent component carriers.

[0157] Figure 9 It is a diagram for explaining signal carrier communication and multi-carrier communication. In particular, Figure 9 A shows a single carrier subframe structure and Figure 9 B shows a multi-carrier subframe structure.

[0158] refer to Figure 9 A. In FDD mode, a general wireless communication system can perform data transmission or reception through a DL frequency band and a corresponding UL frequency band. In another specific embodiment, in TDD mode, the wireless communication system can divide a radio frame into a UL time unit and a DL time unit in the time domain, and perform data transmission or reception through the UL / DL time unit. Figure 9 B. Three 20 MHz component carriers (CCs) can be aggregated into each of the UL and DL, so that a bandwidth of 60 MHz can be supported. Each CC can be adjacent or non-adjacent to each other in the frequency domain. Figure 9B shows the case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical, but the bandwidth of each CC can be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CC assigned / configured to a specific UE through RRC can be called the serving DL / UL CC for the specific UE.

[0159] The base station can perform communication with the UE by activating some or all of the UE's serving CCs or deactivating some CCs. The base station can change the CCs to be activated / deactivated and can change the number of CCs to be activated / deactivated. If the base station allocates CCs available for the UE as cell-specific or UE-specific, at least one of the allocated CCs can be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. One CC that is not deactivated by the UE is called a primary CC (PCC) or primary cell (PCell), and a CC that the base station can freely activate / deactivate is called a secondary CC (SCC) or secondary cell (SCell).

[0160] At the same time, 3GPP NR uses the concept of cells to manage radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CCs and UL CCs. A cell can be configured with DL resources alone, or a combination of DL resources and UL resources. When carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CCs) and the carrier frequency of UL resources (or UL CCs) can be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in the DL is the DL PCC, and the carrier corresponding to the PCell in the UL is the UL PCC. Similarly, the carrier corresponding to the SCell in the DL is the DL SCC, and the carrier corresponding to the SCell in the UL is the UL SCC. Depending on the capabilities of the UE, a serving cell can be configured with one PCell and zero or more SCells. For a UE in the RRC_CONNECTED state but not configured for carrier aggregation or not supporting carrier aggregation, there is only one serving cell configured with only the PCell.

[0161] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" referring to a specific geographical area where a base station or antenna group provides communication services. To distinguish between cells referring to a certain geographical area and cells in carrier aggregation, in this disclosure, cells in carrier aggregation are referred to as CCs, and cells in a geographical area are referred to as cells.

[0162] Figure 10: is a schematic diagram showing an example in which cross-carrier scheduling technology is applied. When cross-carrier scheduling is set, the control channel sent through the first CC can use the carrier indicator field (CIF) to schedule the data channel sent through the first CC or the second CC. The CIF is included in the DCI. In other words, a scheduling cell is set, and the DL grant / UL grant sent in the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, there are search areas for multiple component carriers in the PDCCH area of ​​the scheduling cell. The PCell can basically be a scheduling cell, and a specific SCell can be designated as a scheduling cell by the upper layer.

[0163] exist Figure 10 In the embodiment of , it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is set as the PDCCH monitoring CC. When cross-carrier scheduling is not configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is disabled, and each DL CC can only send a PDCCH for scheduling the PDSCH of a DL CC without CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). At the same time, if cross-carrier scheduling is configured through UE-specific (or UE group-specific or cell-specific) higher layer signaling, CIF is enabled, and a specific CC (e.g., DL PCC) can send not only a PDCCH for scheduling the PDSCH of DL CC A using CIF but also a PDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not sent in another DL CC. Therefore, the UE monitors the PDCCH not including the CIF to receive the PDSCH scheduled by the self-carrier, or monitors the PDCCH including the CIF to receive the PDSCH scheduled by the cross-carrier, depending on whether cross-carrier scheduling is configured for the UE.

[0164] on the other hand, Figure 9 and Figure 10 The subframe structure of the 3GPP LTE-A system is shown in FIG, and the same or similar configuration can be applied to the 3GPP NR system. However, in the 3GPP NR system, Figure 9 and Figure 10 The subframes may be replaced by time slots.

[0165] In the present invention, when a cell is configured with a normal cyclic prefix (CP), the number of symbols included in a time slot is 14, and when a cell is configured with an extended CP, the number of symbols included in a time slot is 12, but for the sake of convenience of description, seven symbols are assumed and described.

[0166] Figure 11 is a diagram illustrating a time slot configuration of a TDD-based mobile communication system.

[0167] refer to Figure 11 , four time slot configurations can be defined, such as time slots including only DL symbols (DL-only), time slots centered on DL symbols (DL-centric), time slots centered on UL symbols (UL-centric), and time slots including only UL symbols (UL-only).

[0168] A time slot can include seven symbols. When changing from downlink to uplink, or when changing from uplink to downlink, a gap may exist. That is, a gap may be inserted between the downlink and uplink, or between the uplink and downlink. One symbol can be used to transmit downlink control information. Hereinafter, the symbols constituting a gap are referred to as gap symbols.

[0169] A time slot including only DL symbols only-DL (DL-only) literally includes only DL symbols. For example, a time slot including only DL symbols includes seven DL symbols, as shown in FIG. Figure 11 DL-only is shown.

[0170] A time slot centered on a DL symbol, DL-centric, includes multiple DL symbols, at least one gap symbol, and at least one UL symbol. For example, a time slot centered on a DL symbol may include five DL symbols, one gap symbol, and one UL symbol in sequence, such as Figure 11 The DL-centric is shown.

[0171] A time slot centered around a UL symbol UL-centric includes at least one DL symbol, at least one slot symbol, and multiple UL symbols. For example, a time slot centered around a UL symbol may include one DL symbol, one slot symbol, and five UL symbols in sequence, such as Figure 11 UL-centric is shown.

[0172] A time slot including only UL symbols literally includes only UL symbols. For example, a time slot including only UL symbols includes seven UL symbols, such as Figure 11 UL-only is shown.

[0173] The network can notify the terminal of the default time slot configuration, for which RRC signaling can be used. Information about the default time slot configuration set by RRC signaling can be called semi-static DL / UL allocation information. The default time slot configuration is a time slot configuration that the terminal can assume is used by the network when the base station does not send signaling for a separate time slot configuration change to the terminal. The 3GPP NR system supports dynamic TDD, which can change the time slot configuration according to various service states of the terminal. To this end, the base station can notify the terminal of the time slot configuration of the current or future time slots every time slot or every few time slots, or every time the base station changes the time slot configuration. Two methods can be used to notify the time slot configuration in the NR system.

[0174] The first method is to use a group-common PDCCH. A group-common PDCCH is a PDCCH broadcast to multiple terminals and can be sent in every time slot, every few time slots, or only when the base station needs it. The group-common PDCCH may include a (dynamic) slot format information indicator (SFI) to send information about the time slot configuration, and the slot format information indicator may notify the current time slot configuration in which the group-common PDCCH is sent, or notify multiple future time slot configurations including the current time slot configuration. When a group-common PDCCH is received, the terminal can know the current time slot configuration or the future time slot configuration including the current time slot through the slot configuration information indicator included in the group-common PDCCH. If the reception of the group-common PDCCH fails, the terminal cannot determine whether the base station sends the group-common PDCCH.

[0175] The second method is a method of sending information about time slot configuration in a UE-specific PDCCH for scheduling PDSCH or PUSCH. The UE-specific PDCCH can be unicast only to specific users that need to be scheduled. The UE-specific PDCCH can send the same time slot format information indicator as the time slot format information indicator sent in the group-common PDCCH as the time slot configuration information of the scheduled time slot. Alternatively, the UE-specific PDCCH may include information from which the configuration of the scheduled time slot can be inferred. For example, a terminal can know the time slot to which the PDSCH or PUSCH is allocated and the position of the OFDM symbol within the time slot by receiving the UE-specific PDCCH assigned to the terminal, and infer the configuration of the time slot therefrom. In addition, the UE-specific PDCCH that schedules the PDSCH can indicate the time slot in which the PUCCH including HARQ-ACK feedback information is transmitted and the position of the OFDM symbol in the time slot, from which the configuration of the time slot in which the PUCCH is transmitted can be inferred.

[0176] Hereinafter, the downlink signal used in this specification is a radio signal sent from a base station to a terminal, and may include a physical downlink channel, sequence, reference signal (DM-RS, CSI-RS, TRS, PT-RS, etc.) generated and processed in the physical layer, MAC message generated and processed in the MAC layer and RRC layer, and RRC message (or RRC signaling). MAC message and RRC message may be referred to as higher layer signaling to distinguish them from signals of the physical layer constituting the lower layer of OSI. Here, the downlink physical channel may further include a downlink physical shared channel (PDSCH), a downlink physical control channel (PDCCH), and a physical broadcast channel (PBCH).

[0177] In addition, the uplink signal used in this specification is a radio signal sent by the terminal to the base station, and may include a physical uplink channel, sequence, reference signal (SRS, etc.) generated and processed at the physical layer, and MAC messages and RRC messages (or RRC signaling) generated and processed in the MAC layer and RRC layer, respectively. Here, the uplink physical channel may again include an uplink physical shared channel (PUSCH), an uplink physical uplink control channel (PUCCH), and a physical random access channel (PRACH).

[0178] 12 is a diagram illustrating a physical uplink control channel (PUCCH) used in a wireless communication system according to an example.

[0179] 12 , the 3GPP NR system may use two types of PUCCHs according to the size of time resources (ie, the number of symbols) used for transmission of the PUCCH.

[0180] The first type PUCCH may be referred to as a long PUCCH and may be transmitted by mapping four or more consecutive symbols to a time slot. The first type PUCCH is mainly used to transmit a large amount of uplink control information (UCI), or is allocated to users with low signal strength so that it can be used to increase the coverage of the PUCCH. In addition, the first type PUCCH may be repeatedly transmitted in multiple time slots to increase the coverage of the PUCCH. The first type PUCCH may include PUCCH format 1 that transmits 1 or 2 bits of UCI, PUCCH format 3 that does not support multiplexing between users while transmitting UCI greater than 2 bits, and PUCCH format 4 that supports multiplexing between users while transmitting UCI greater than 2 bits.

[0181] The second type PUCCH may be referred to as a short PUCCH, may be mapped to one or two symbols of a time slot and transmitted, and may be used to transmit a small amount of UCI, or may be allocated to users with high signal strength, and may also be used to support services requiring low latency. The second type PUCCH may include PUCCH format 0 for transmitting 1 or 2 bits of UCI and PUCCH format 2 for transmitting more than 2 bits of UCI.

[0182] In a time slot, there may be time-frequency resources available for the first type PUCCH and time-frequency resources available for the second type PUCCH, and these resources may be allocated to different terminals or a single terminal. When allocated to a single terminal, the first type PUCCH and the second type PUCCH may be transmitted in different time resources (i.e., different OFDM symbols). That is, when allocated to a single terminal, the first type PUCCH and the second type PUCCH may be transmitted using time division multiplexing (TDM).

[0183] The UCI mapped to the PUCCH may include scheduling grant (SR), HARQ-ACK, rank information (RI), CSI, and beam-related information (BI). SR is information that notifies the base station of the presence of uplink transmission. HARQ-ACK is information that notifies whether the reception of the physical downlink shared channel (PDSCH) transmitted by the base station is successful. RI is information that notifies the rank that can be transmitted over the radio channel when multiple antennas are used. CSI is information that notifies the value of measuring the channel conditions between the base station and the terminal. BI is information that notifies information about the beamforming of the transmitter and receiver.

[0184] Referring to Figure 12 (a), a time slot centered on a DL symbol (DL-centered) may be configured and indicated by five DL symbols, one flexible symbol, and one UL symbol. A second type PUCCH having a first symbol length may be allocated to a time slot centered on a DL symbol. The second type PUCCH may be located in the last symbol of the time slot.

[0185] Referring to Figure 12(b), the illustrated time slot centered around a UL symbol (UL-centered) can be configured and indicated by one DL symbol, one flexible symbol, and five UL symbols. A first-type PUCCH or / and a second-type PUCCH can be allocated to the time slot centered around a UL symbol. The first-type PUCCH can be mapped to four symbols, and the second-type PUCCH can be mapped to the last symbol of the time slot.

[0186] 12( c ), the first type PUCCH and / or the second type PUCCH may be allocated to a slot having only UL symbols (UL only). For example, the first type PUCCH may be mapped to six symbols, and the second type PUCCH may be mapped to the last symbol of the slot.

[0187] refer to Figure 11 12 , the time slot configuration in which the second type PUCCH can be sent is a time slot centered on a DL symbol, a time slot centered on a UL symbol, and a time slot including only UL symbols, and the time slot configuration in which the first type PUCCH can be sent is a time slot centered on a UL symbol and a time slot including only UL symbols. In addition, the time slots in which the first type PUCCH and the second type PUCCH can be sent by TDM are a time slot centered on a UL symbol and a time slot including only UL symbols. For reference, since there is only one symbol allocated to the uplink in the time slot centered on the DL symbol, the second type PUCCH can be sent, but the first type PUCCH cannot be sent. Therefore, the PDCCH that schedules the PUCCH can allocate the first type PUCCH to a time slot centered on the UL symbol or a time slot including only UL symbols. In addition, the PDCCH that schedules the PUCCH can allocate the second type PUCCH to a time slot centered on a DL symbol, a time slot centered on a UL symbol, or a time slot including only UL symbols.

[0188] As described above, the base station (or network) can change the time slot configuration according to the terminal's business and various situations, and can notify the terminal of the change in the corresponding time slot configuration. Because the time slot configuration can be changed as described above, the terminal should receive the time slot configuration information indicator or information about the time slot configuration by monitoring the group common PDCCH and the UE-specific PDCCH. However, due to problems such as the radio channel state and interference between the base station and the terminal, the terminal may not be able to receive the group common PDCCH and the UE-specific PDCCH.

[0189] When the terminal fails to receive the group-common PDCCH and / or UE-specific PDCCH, the terminal may not be able to recognize whether the base station has changed the time slot configuration. However, in the case where the base station has changed the time slot configuration and the PUCCH transmission scheduled by the terminal is not suitable for the changed time slot configuration, if the terminal forces the PUCCH transmission as scheduled, the failure to send the PUCCH may cause problems such as temporary loss of communication or delay. Therefore, in this case, a clear procedure or preliminary agreement is required between the terminal and the base station regarding whether the terminal sends or discards the indicated PUCCH, and how to perform the transmission in the affirmative case.

[0190] Embodiments for this purpose define operating methods of a terminal and a base station, which are intended to address a situation where the terminal fails to receive a group-common PDCCH and / or a UE-specific PDCCH including a slot configuration information indicator and information related to the slot configuration.

[0191] In another embodiment, even if the terminal successfully receives the group-common PDCCH and / or UE-specific PDCCH including the time slot configuration information indicator and time slot configuration-related information, if the configuration of the time slot to which the PUCCH is allocated (or the scheduled transmission of the PUCCH) is changed and the allocated PUCCH cannot be sent, a terminal for processing the transmission of the PUCCH, an operating method thereof, and a base station for processing the reception of the allocated PUCCH and an operating method thereof are defined.

[0192] [Example]

[0193] First, the method for operating a terminal and a base station according to this embodiment will be described. This embodiment implements predictable communication between the terminal and the base station by imposing certain restrictions on the base station's time slot configuration changes. In this case, the terminal can perform PUCCH transmission regardless of the success or failure of receiving the group-common PDCCH and the UE-specific PDCCH.

[0194] Embodiment: The slot configuration including the symbols in which the PUCCH is allocated (or to be transmitted) remains the same No change.

[0195] This embodiment may be divided into detailed examples according to whether the allocated (or to be transmitted) PUCCH is a first type PUCCH or a second type PUCCH.

[0196] As an example, the time slot configuration of the symbol to which the first type PUCCH is allocated (or transmitted) remains the same and does not change. That is, the base station does not change the time slot configuration of the OFDM symbol to which the first type PUCCH is allocated, and the terminal also assumes (or commits or expects) that the time slot configuration of the OFDM symbol to which the first type PUCCH is allocated has not changed. Therefore, the terminal can transmit the first type PUCCH regardless of receiving the time slot configuration information indicator and time slot configuration related information transmitted in the group-common PDCCH and the UE-specific PDCCH.

[0197] As another example, the time slot configuration of the symbol to which the second type PUCCH is allocated (or to be transmitted) remains the same without changing. That is, the base station does not change the time slot configuration of the symbol to which the first type PUCCH is allocated (or to be transmitted), and the terminal also assumes (or commits or expects) that the time slot configuration of the symbol to which the second type PUCCH is allocated (to be transmitted) has not changed. Therefore, the terminal can transmit the second type PUCCH regardless of receiving the time slot configuration information indicator and time slot configuration related information transmitted in the group-common PDCCH and the UE-specific PDCCH.

[0198] As described above, the embodiment that prohibits the time slot configuration of the base station from being changed may become a limitation in flexible scheduling. To supplement this aspect, the embodiment of another aspect of allowing the time slot configuration of the base station to be changed within a specific range is disclosed below.

[0199] The slot configuration of symbols in which the PUCCH is allocated (or to be transmitted) can only be changed within a certain range.

[0200] Even if the time slot configuration of the symbol in which the PUCCH is allocated (or to be transmitted) is changed, the time slot configuration can be changed to a time slot configuration in which the PUCCH can be transmitted, but cannot be changed to a time slot configuration in which the PUCCH cannot be transmitted. Therefore, with respect to the time slot for PUCCH transmission indicated by the base station, the terminal does not expect to change to a time slot in which PUCCH transmission is unavailable. This embodiment according to this aspect can be divided into detailed embodiments again according to whether the allocated PUCCH is a first type PUCCH or a second type PUCCH.

[0201] For example, even if the time slot configuration of the symbol to which the first type PUCCH is allocated is changed, the base station can change the time slot configuration to a time slot configuration in which the first type PUCCH can be transmitted, but cannot change the time slot configuration to a time slot configuration in which the transmission of the first type PUCCH is unavailable. Therefore, with respect to the time slot for the transmission of the first type PUCCH indicated by the base station, the terminal does not expect to change to a time slot in which the transmission of the first type PUCCH is unavailable. Even if the terminal fails to receive the group-common PDCCH including the time slot configuration information indicator for the time slot for transmitting the first type PUCCH, the terminal can always transmit the first type PUCCH to the allocated resources.

[0202] For example, referring to Figure 12, the base station can change the time slot centered on the UL symbol to which the first type PUCCH of the fourth OFDM symbol length is allocated to a time slot including only UL symbols, but cannot change the time slot centered on the UL symbol to a time slot including only DL symbols having one UL symbol or a time slot centered on a DL symbol. On the other hand, the terminal may expect to be able to change the time slot centered on the UL symbol to which the first type PUCCH with a length of 4 OFDM symbols indicated by transmission from the base station is allocated to a time slot including only UL symbols, but does not expect to change it to a time slot including only DL symbols or a time slot centered on a DL symbol. In addition, the terminal does not expect a change in the time slot configuration in which the UL symbol indicated by the base station to send the first type PUCCH is changed to a DL symbol.

[0203] As another example, even if the time slot configuration of the symbol to which the second type PUCCH is allocated is changed, the base station may change the time slot configuration to a time slot configuration in which the second type PUCCH can be sent, but may not change the time slot configuration to a time slot configuration in which the transmission of the second type PUCCH is unavailable. Therefore, relative to the time slot for the transmission of the first type PUCCH indicated by the base station, the terminal does not expect to change to a time slot in which the second type PUCCH transmission is unavailable. Even if the terminal fails to receive the group common PDCCH including the time slot configuration information indicator for the time slot for sending the second type PUCCH, the terminal may always send the second type PUCCH to the allocated resources. More specifically, the base station may change the time slot centered on the UL symbol to which the second type PUCCH is allocated to a time slot centered on the DL symbol in which the second type PUCCH can be sent, or a time slot including only UL symbols, but may not change the time slot to a time slot including only DL symbols in which the second type PUCCH transmission is unavailable. In addition, relative to the time slot indicated to send the second type PUCCH, the terminal does not expect the base station to become a time slot in which the transmission of the second type PUCCH is unavailable.

[0204] For example, the terminal may expect (or predict) that the time slot centered on the UL symbol to which the second type PUCCH of one or two symbol lengths instructed by the base station to be transmitted is allocated can be changed to a time slot centered on a DL symbol including the second type PUCCH or a time slot including only UL symbols, but does not expect (or predict) that the time slot centered on the UL symbol can be changed to a time slot including only DL symbols in which the second type PUCCH cannot be included. In addition, the terminal does not expect a change in the time slot configuration in which the UL symbol instructed by the base station to transmit the second type PUCCH is changed to a DL symbol.

[0205] Compared with the above-mentioned embodiment that allows the time slot configuration of the base station to change within a certain range, another embodiment for increasing scheduling flexibility is disclosed.

[0206] The slot configuration of the symbols in which PUCCH is allocated (or to be transmitted) can be freely changed

[0207] The base station can freely change the configuration of the time slot to which the PUCCH is allocated.

[0208] In an example where the PUCCH is a first type PUCCH, if the terminal fails to receive the group-common PDCCH including the slot configuration information indicator of the slot for transmitting the first type PUCCH, the terminal may not transmit the first type PUCCH to the allocated resources.

[0209] In an example where the PUCCH is the second type PUCCH, if the terminal fails to receive the group-common PDCCH including the slot configuration information indicator of the slot for transmitting the second type PUCCH, the terminal may not transmit the second type PUCCH to the allocated resources.

[0210] According to the above embodiments, even if the terminal fails to receive the group-common PDCCH and / or UE-specific PDCCH from the base station, since the transmission and transmission process of the scheduled PUCCH are clearly defined, the communication error or delay problem can be solved.

[0211] [Another embodiment]

[0212] Another embodiment of the present disclosure relates to an operation process of a terminal and a base station when the slot configuration of the base station is freely changed and the terminal successfully receives at least one of a group-common PDCCH and a UE-specific PDCCH including a slot configuration information indicator and slot configuration related information.

[0213] More specifically, disclosed are a terminal for processing the transmission of PUCCH and an operating method thereof, as well as a base station for processing the reception of PUCCH and an operating method thereof, when the configuration of the time slot to which PUCCH is allocated (or scheduled to send PUCCH) is changed and the changed time slot configuration is inconsistent with the PUCCH (i.e., when the UL symbol to which PUCCH is allocated in the time slot to which PUCCH is allocated overlaps with the DL symbol according to the changed time slot configuration).

[0214] In the modified time slot configuration, the transmission of the allocated PUCCH may be available (or valid, or appropriate) or may not be available (so-called contradictory time slot configuration). Here, for example, referring to Figure 12, the time slots capable of transmitting PUCCH include time slots centered on UL symbols or time slots including only UL symbols to which the first type PUCCH is allocated, and time slots centered on DL symbols or time slots centered on UL symbols or time slots including only UL symbols to which the second type PUCCH is allocated. In addition, the time slots in which PUCCH cannot be transmitted include, for example, the case where the time slot to which the first type PUCCH is allocated is changed to a time slot centered on DL symbols or a time slot configuration including only DL symbols, or the case where the time slot to which the second type PUCCH is allocated is changed to a time slot configuration including only DL symbols.

[0215] When the configuration of the time slot indicated to send PUCCH is changed, if the PUCCH transmission allocated in the changed time slot configuration is available (or valid or suitable), the terminal can perform the transmission of PUCCH as scheduled in the indicated time slot. However, even in the case where the time slot indicated by the change in configuration conflicts with the transmission of PUCCH, a special protocol is required between the terminal and the base station in order to send PUCCH as scheduled. Hereinafter, a method for processing PUCCH under a conflicting time slot configuration will be described. Because the information sent to the base station via PUCCH is UCI, the present invention may include an embodiment in which the term PUCCH is replaced by UCI in all embodiments of this specification. For example, from the perspective of UCI, the method for processing PUCCH under a conflicting time slot configuration corresponds to the method for processing UCI (HARQ-ACK, RI, etc.) under a conflicting time slot configuration.

[0216] Method for processing PUCCH in indicated time slot

[0217] First, when the allocated PUCCH is the first type PUCCH, a PUCCH processing method under conflicting slot configurations will be described. Figure 3 The described UCI (HARQ-ACK, RI, CSI, etc.) is mapped to the first type PUCCH.

[0218] In one aspect, a method of processing PUCCH may include: receiving, by a terminal, a group common PDCCH including a time slot configuration information indicator indicating a time slot in which a first type PUCCH is to be sent, and performing transmission of the first type PUCCH or the second type PUCCH based on a condition according to the following example.

[0219] As an example, the terminal may transmit the first type PUCCH in the indicated time slot based on a result of comparing the UL symbol configured according to the time slot in the time slot indicated to transmit the first type PUCCH with the UL symbol allocated for transmission of the first type PUCCH. For example, if the UL symbol configured according to the time slot in the time slot indicated to transmit the first type PUCCH is greater than (or greater than or equal to) the UL symbol required for transmission of the first type PUCCH, the terminal transmits the first type PUCCH to the allocated resource in the time slot.

[0220] As another example, the terminal may send the first type PUCCH or discard or suspend transmission based on a result of comparing the UL symbol configured according to the time slot in the time slot indicated to send the first type PUCCH with the UL symbol required for sending the first type PUCCH. For example, if the UL symbol configured according to the time slot in the time slot indicated to send the first type PUCCH is less than the UL symbol required for the transmission of the first type PUCCH, the terminal may discard the transmission of the first type PUCCH in the indicated time slot. For example, if the time slot indicated to send PUCCH is a plurality of time slots other than the first time slot in which the first type PUCCH transmission is scheduled, the terminal may send the first type PUCCH by postponing to the second time slot, which provides the UL symbol required for sending the first type PUCCH. On the other hand, if the time slot indicated to send PUCCH is a single time slot, the terminal may discard or suspend the scheduled first type PUCCH transmission.

[0221] As another example, the terminal may transmit the first type PUCCH based on a result of comparing the UL symbols configured according to the slot in the slot indicated to transmit the first type PUCCH, the flexible symbols, and the UL symbols allocated for transmission of the first type PUCCH. For example, if the symbols including the UL symbols configured according to the slot in the slot indicated to transmit the first type PUCCH and the flexible symbols are greater than (or greater than or equal to) the UL symbols required for transmission of the first type PUCCH, the terminal transmits the first type PUCCH to the allocated resources in the slot.

[0222] As another example, the terminal may send the first type PUCCH or discard or suspend transmission based on a result of comparing the UL symbols configured according to the time slot in the time slot indicated to send the first type PUCCH, the flexible symbols, and the UL symbols used to send the first type PUCCH. For example, if the symbols including the UL symbols and the flexible symbols configured according to the time slot in the time slot indicated to send the first type PUCCH are less than the UL symbols required for the transmission of the first type PUCCH, the transmission of the first type PUCCH may be discarded in the indicated time slot. For example, if the time slot indicated to send the PUCCH is a plurality of time slots, the terminal may send the first type PUCCH in a time slot among the plurality of time slots that satisfies the number of UL symbols allocated to the transmission of the first type PUCCH. On the other hand, if the time slot indicated to send the PUCCH is a single time slot, the terminal may discard or suspend the scheduled first type PUCCH transmission.

[0223] In another aspect, a method for processing a PUCCH may include: receiving, by a terminal, a group-common PDCCH and a UE-specific PDCCH indicating a time slot configuration of a time slot indicated for transmitting a first-type PUCCH; and transmitting the first-type PUCCH or the second-type PUCCH according to a condition. In this case, the terminal may determine whether to transmit the first-type PUCCH in the indicated time slot based on the condition according to the following example.

[0224] As an example, i) the base station may change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives the group-common PDCCH and the UE-specific PDCCH indicating the configuration of the time slot to which the first type PUCCH is allocated, iii) if the configuration of the time slot is a time slot in which the first type PUCCH can be sent, the terminal may send the first type PUCCH to the allocated resources of the time slot.

[0225] As another example, i) the base station may change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives the group-common PDCCH and the UE-specific PDCCH indicating the configuration of the time slot to which the first type PUCCH is allocated, but iii) if the configuration of the time slot is a time slot in which the first type PUCCH cannot be transmitted, the terminal may not perform transmission of the first type PUCCH in the time slot, or transmit the first type PUCCH corresponding to the changed time slot configuration, or as shown in FIG. Figure 13 The second type PUCCH is sent in the time slot instead of the first type PUCCH as shown in . The specific operation of the terminal is shown in Table 4 below.

[0226] [Table 4]

[0227]

[0228]

[0229] As another example, i) the base station may change the configuration of the time slot to which the first type PUCCH is allocated, ii) the terminal successfully receives the group-common PDCCH and the UE-specific PDCCH indicating the configuration of the time slot to which the first type PUCCH is allocated, iii) the configuration of the time slot is a time slot in which the first type PUCCH can be sent, and iv) PUSCH is allocated to the time slot (or scheduled to be sent) and is configured to transmit PUCCH and PUSCH simultaneously, (v) if intermodulation distortion (IMD) may occur due to frequency separation between PUCCH and PUSCH, and it is configured not to send the first type PUCCH, the terminal performs at least one of the operations according to Table 4 above.

[0230] Next, a case where the allocated PUCCH is the second type PUCCH will be described. Figure 3 The described UCI (HARQ-ACK, RI, CSI, etc.) is mapped to the second type PUCCH.

[0231] In one aspect, a method for processing a PUCCH may include: receiving, by a terminal, a group-common PDCCH, the group-common PDCCH including a time slot configuration information indicator indicating a time slot for transmitting a second-type PUCCH; and performing transmission of the second-type PUCCH according to a condition. In this case, the terminal may determine whether to transmit the second-type PUCCH based on the condition according to the following example.

[0232] As an example, the terminal may transmit the second type PUCCH based on a result of comparing the UL symbol configured according to the time slot in the time slot indicated to transmit the second type PUCCH with the UL symbol allocated for transmission of the second type PUCCH. For example, if the UL symbol configured according to the time slot in the time slot indicated to transmit the second type PUCCH is greater than (or greater than or equal to) the UL symbol required for transmission of the second type PUCCH, the terminal transmits the second type PUCCH to the allocated resources in the time slot.

[0233] As another example, the terminal may send the second type PUCCH or discard or suspend transmission based on the result of comparing the UL symbol configured according to the time slot in the time slot indicated to send the second type PUCCH with the UL symbol required for sending the second type PUCCH. For example, if the UL symbol configured according to the time slot in the time slot indicated to send the second type PUCCH is less than the UL symbol allocated to the transmission of the second type PUCCH, the transmission of the second type PUCCH may be discarded in the indicated time slot. For example, if the time slot indicated to send PUCCH is multiple time slots, the terminal may send the second type PUCCH in the second time slot among the multiple time slots that meets the number of UL symbols required for the transmission of the second type PUCCH. On the other hand, if the time slot indicated to send PUCCH is a single time slot, the terminal may discard or suspend the scheduled second type PUCCH transmission.

[0234] As another example, the terminal may transmit the second type PUCCH based on a result of comparing the UL symbols configured according to the slot in the slot indicated to transmit the second type PUCCH, the flexible symbols, and the UL symbols allocated for transmission of the second type PUCCH. For example, if the symbols including the UL symbols configured according to the slot in the slot indicated to transmit the second type PUCCH and the flexible symbols are greater than (or greater than or equal to) the UL symbols required for transmission of the second type PUCCH, the terminal transmits the second type PUCCH to the allocated resources in the slot.

[0235] As another example, the terminal may send the second type PUCCH or discard or suspend transmission based on a result of comparing the UL symbols configured according to the time slot in the time slot indicated to send the second type PUCCH, the flexible symbols, and the UL symbols required for sending the second type PUCCH. For example, if the symbols including the UL symbols and the flexible symbols configured according to the time slot in the time slot indicated to send the second type PUCCH are less than the UL symbols required for the transmission of the second type PUCCH, the transmission of the second type PUCCH may be discarded in the indicated time slot. For example, if the time slot indicated to send PUCCH is a plurality of time slots, the terminal may send the second type PUCCH in a second time slot among the plurality of time slots that meets the number of UL symbols required for transmitting the second type PUCCH. On the other hand, if the time slot indicated to send PUCCH is a single time slot, the terminal may discard or suspend the scheduled second type PUCCH transmission.

[0236] Method for processing PUCCH in a time slot different from the indicated time slot

[0237] The PUCCH processing method according to this embodiment may include, when the configuration of the time slot indicated to transmit the PUCCH is changed, performing transmission by the terminal in another time slot after the indicated time slot. That is, when the UL symbol carrying the PUCCH in the time slot to which the PUCCH is allocated overlaps with the DL symbol in the time slot according to the changed time slot configuration, the terminal may postpone or delay the transmission of the PUCCH to another time slot in which the PUCCH can be transmitted, rather than the designated time slot.

[0238] In another delayed time slot, the PUCCH has the same type as the allocated specific type PUCCH, or a PUCCH of a type different from the allocated specific type PUCCH may be transmitted. In another delayed time slot, the PUCCH of the same type as the allocated specific type PUCCH may be transmitted, and the time domain allocation for PUCCH transmission may be different from that of the allocated specific type PUCCH.

[0239] First, when the allocated PUCCH is the first type PUCCH, the PUCCH processing method under the conflicting time slot configuration will be described. Here, the first type PUCCH may include the above reference Figure 3 The described UCI, specifically, HARQ-ACK, RI, CSI, etc. Since the information mapped to the first type PUCCH is UCI, the present invention may include an embodiment in which the term first type PUCCH is replaced by UCI in all embodiments of this specification.

[0240] FIG. 14 is a diagram illustrating an example of transmitting a PUCCH to another slot as the slot configuration is changed.

[0241] 14(a), the terminal can recognize that the time slot N centered on the UL symbol to which the first type PUCCH (long PUCCH) is allocated is changed by the base station to a time slot configuration centered on the DL symbol in which the first type PUCCH cannot be transmitted by receiving a group-common PDCCH and / or a UE-specific PDCCH indicating a change in the time slot configuration. In this case, the terminal can transmit the first type PUCCH in the delayed time slot N+K while not transmitting the first type PUCCH in time slot N. That is, in the delayed time slot N+K, a first type PUCCH of the same type as the allocated first type PUCCH is transmitted. Here, time slot N+K can be a time slot centered on the UL symbol as the nearest time slot in which the allocated first type PUCCH can be transmitted.

[0242] In other words, although the base station changes the configuration of the time slot to which the first type PUCCH is allocated and the terminal successfully receives the group-common PDCCH and the UE-specific PDCCH including the time slot configuration information, if the configuration of the time slot is a time slot in which the first type PUCCH cannot be sent, the terminal may not send the first type PUCCH in the time slot, and may send the first type PUCCH in the nearest time slot among the subsequent time slots in which the first type PUCCH can be sent.

[0243] Meanwhile, referring to FIG14( b), the terminal can recognize that the time slot N centered on the UL symbol to which the first type PUCCH (long PUCCH) is allocated is changed by the base station to a time slot configuration in which the first type PUCCH cannot be transmitted by receiving a group-common PDCCH and / or a UE-specific PDCCH indicating a change in the time slot configuration. In this case, the terminal can send a second type PUCCH (short PUCCH) in time slot N+K while not sending the first type PUCCH in time slot N. In the delayed time slot N+K, a second type PUCCH of a different type from the allocated first type PUCCH is sent. That is, in the delayed time slot N+K, a second type PUCCH of a type changed from the allocated first type PUCCH is sent. Here, time slot N+K can be a time slot centered on the DL symbol as the nearest time slot in which the second type PUCCH can be transmitted.

[0244] In other words, although the base station changes the configuration of the time slot to which the first type PUCCH is allocated, and the terminal successfully receives the group-common PDCCH and the UE-specific PDCCH including the time slot configuration information, if the configuration of the time slot is a time slot in which the first type PUCCH cannot be sent, the terminal may not send the first type PUCCH in the time slot, and thereafter, may send the second type PUCCH in the nearest time slot in which the second type PUCCH can be sent among the subsequent time slots.

[0245] Here, the UCI transmitted through the second type PUCCH may include only a portion of the UCI originally scheduled for transmission according to its importance, and may not include the rest.

[0246] In one aspect, the terminal may send some information of UCI according to the importance of the UCI type that should initially be sent through the first type PUCCH. As an example, the importance or priority of the UCI type that can be sent in the first type PUCCH can be defined in the order of HARQ-ACK, rank information (RI), channel state information (CSI), beam-related information (BRI) (e.g., beam recovery request) (HARQ-ACK>RI>CSI>BRI). As another example, the importance or priority of the UCI type that can be sent in the first type PUCCH can be defined in the order of HARQ-ACK, beam-related information, RI, and CSI (HARQ-ACK>BRI>RI>CSI). As another example, the importance or priority of the UCI type that can be sent in the first type PUCCH can be defined in the order of beam-related information, HARQ-ACK, RI, and CSI (BRI>HARQ-ACK>RI>CSI).

[0247] On the other hand, the terminal may transmit some types of UCI of high importance through the second type PUCCH according to the amount of UCI that can be transmitted through the second type PUCCH.

[0248] On the other hand, when the information to be transmitted in the first-type PUCCH includes information about the primary cell (PCell) and the secondary cell (SCell), the terminal may transmit some information based on the importance or priority between the primary cell and the secondary cell. As an example, the terminal may transmit only UCI related to the primary cell via the second-type PUCCH. As another example, when the information to be transmitted in the first-type PUCCH includes information about the primary cell or the primary / secondary cell (PSCell), the terminal may transmit only UCI related to the primary cell or the primary / secondary cell (PSC) via the second-type PUCCH.

[0249] On the other hand, the terminal may preferentially transmit UCI for DL ​​associated with a PUCCH transmittable cell (eg, an SIB-linked DL cell) on each PUCCH group through the second type PUCCH.

[0250] On the other hand, the terminal can send a second type PUCCH based on the importance between the primary cell and the secondary cell and the importance of the UCI type. As an example, the terminal can send a UCI type with a high priority among the UCI related to the primary cell (HARQ-ACK, beam-related information, RI, CSI, etc.) through the second type PUCCH. This priority mainly considers the type of serving cell in addition to the type of UCI to be sent through the second type PUCCH. Of course, the type of UCI sent through the second type PUCCH can be considered in preference to the type of serving cell. The priority between the serving cell and the UCI can be sent to the terminal by the base station by being included in the configuration information such as RRC signaling, or can be defined separately according to the payload size of the second type PUCCH.

[0251] On the other hand, the terminal may transmit only up to a predetermined number of UCI bits through the second-type PUCCH according to the UCI payload size. For example, the terminal may be configured to transmit up to X bits of UCI through the second-type PUCCH (where X is {2<=X<=tens of bits}).

[0252] On the other hand, the terminal can be configured to send up to X bits of HARQ-ACK or BRI (where X is {2 <= X <= tens of bits}) through the second type PUCCH based on a specific type of UCI (ie, the number of bits of HARQ-ACK or BRI).

[0253] Method for processing HARQ-ACK in a time slot different from an indicated time slot

[0254] According to one aspect, the HARQ-ACK processing method includes: changing, by the base station, the configuration of the time slot N to which the PUCCH is allocated; receiving, by the terminal, a group-common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration; and if the allocated PUCCH cannot be sent under the changed time slot configuration (i.e., the changed time slot configuration is inconsistent with the allocated PUCCH), sending, by the terminal, the allocated PUCCH among the allocated PUCCHs after delaying the HARQ-ACK information by K time slots (i.e., N+K) from time slot N.

[0255] Here, the "allocated PUCCH" according to this embodiment can be a first type PUCCH or a second type PUCCH. In addition, the K value can be determined based on the time it takes for the base station to feedback PUCCH in PDSCH scheduling. In the time slot where PUCCH can be sent after time slot N+K, PUCCH for HARQ-ACK feedback of another terminal may not be allocated. For example, when the terminal and the base station communicate with each other based on frequency division duplex (FDD), PUCCH for HARQ-ACK of other terminals (common to 3GPP LTE, LTE-A, and NR) may not be sent (or allocated) in the time slot sent after 4ms. The K value can be provided by RRC signaling.

[0256] According to another aspect, the HARQ-ACK processing method may include: changing, by the base station, the configuration of the time slot N to which the first type PUCCH is allocated; receiving, by the terminal, a group-common PDCCH and / or a UE-specific PDCCH including information about the changed time slot configuration; and when the first type PUCCH cannot be sent under the changed time slot configuration but the second type PUCCH can be sent, waiting, by the terminal, for PUCCH reallocation by the base station without sending the first type PUCCH.

[0257] As an example, this method of processing HARQ-ACK may further include: the base station retransmitting the PDSCH to the terminal that does not send the first type PUCCH of HARQ-ACK including the PDSCH, and allocating resources for newly sending the first type PUCCH in the PDCCH that schedules the PDSCH.

[0258] According to another aspect, the HARQ-ACK processing method includes: changing, by the base station, the configuration of the time slot N to which the PUCCH is allocated; and if the terminal does not receive the group-common PDCCH that transmits the configuration information of time slot N but receives the UE-specific PDCCH that schedules the PDSCH (or PUSCH) to learn the time slot configuration of time slot N, the terminal selectively transmits the PUCCH based on the time slot configuration. As an example, if the time slot configuration is a time slot configuration in which the allocated PUCCH can be transmitted, the terminal may transmit the PUCCH. As another example, if the time slot configuration is a time slot configuration in which the allocated PUCCH cannot be transmitted, the terminal may not transmit the PUCCH. Here, the allocated PUCCH may be a first type PUCCH or a second type PUCCH.

[0259] [Another embodiment]

[0260] Another embodiment of the present disclosure relates to information about time slot configuration sent by a base station to a terminal, and methods for operating a terminal and a base station based on the information. The base station may use various information and procedures to notify the terminal of the time slot configuration. The information about the time slot configuration may include the following various embodiments.

[0261] Information about time slot configuration

[0262] On the one hand, the information about the time slot configuration includes semi-static DL / UL assignment information. As an example, the base station may send a default time slot format or semi-static DL / UL assignment information (or semi-static time slot format information (SFI)) to the terminal cell specifically, and additionally send the semi-static DL / UL assignment information to the terminal through a UE-specific RRC message. At the same time, upon receiving the semi-static DL / UL assignment information (or default time slot format), the terminal can know which time slot configuration the time slot has. The semi-static DL / UL assignment information (or default time slot format) indicates information about whether each symbol in the time slot is a DL symbol, a UL symbol, or other symbols (or flexible symbols) other than DL symbols and UL symbols. Here, the terminal may assume that symbols for which the semi-static DL / UL allocation information (or default time slot format) is not indicated are indicated as "unknown (or flexible)".

[0263] On the other hand, information about the time slot configuration includes dynamic time slot format information (SFI) included and transmitted in the group common PDCCH. The dynamic time slot format information indicates information about whether each symbol in the time slot is a DL symbol, a UL symbol, and a different symbol (unknown or flexible symbol) other than the DL symbol and the UL symbol. Flexible symbols can replace gaps and can be used for purposes other than gaps. The group common PDCCH in which the dynamic time slot format information is transmitted can be scrambled using SFI-RNTI. Whether the terminal monitors the dynamic time slot format information can be configured or indicated by an RRC message. The terminal that the RRC message does not indicate to monitor may not receive the dynamic time slot format information.

[0264] On the other hand, the time slot configuration information may be scheduling information included in downlink control information (DCI) mapped to a UE-specific PDCCH. For example, if there is information about the starting position and length of the PDSCH in the DCI, it can be assumed that the symbols scheduled for the corresponding PDSCH are DL symbols. In addition, if there is information about the starting position and length of the PUSCH in the DCI, it can be assumed that the symbols scheduled for the corresponding PUSCH are UL symbols. If there is information about the starting position and length of the PUCCH for HARQ-ACK transmission in the DCI, it can be assumed that the symbols scheduled for the corresponding PUCCH are UL symbols.

[0265] Method for determining symbol direction and method for processing PUCCH

[0266] Because there are various information about time slot configurations as described above, a terminal can receive information about different types of time slot configurations for the same time slot. The information about each time slot configuration can then indicate different symbol directions within the same time slot. In this case, how the terminal and base station change or determine symbol direction can follow the following rules.

[0267] On the one hand, the DL symbols and UL symbols of the semi-static DL / UL assignment information (or default time slot format) are not changed in direction by the dynamic time slot configuration information or scheduling information. Therefore, if the PUCCH is located in the UL symbol configured by the semi-static DL / UL assignment information (or default time slot format), the terminal can send the PUCCH regardless of the dynamic time slot configuration information or scheduling information. If at least one of the symbols to which the PUCCH is allocated overlaps with the DL symbol of the default time slot format, the terminal does not send the corresponding PUCCH or changes the length of the PUCCH to match the length of the remaining symbols except the corresponding DL symbol and sends the PUCCH. Here, the allocated PUCCH can be a first type PUCCH or a second type PUCCH.

[0268] On the other hand, the direction of the flexible symbols configured by the semi-static DL / UL assignment information (or the default slot format) can be determined or changed by dynamic slot configuration information or scheduling information. If at least one of the symbols to which the PUCCH is allocated overlaps with the flexible symbols of the semi-static DL / UL assignment information (or the default slot format), the terminal can determine whether to transmit the PUCCH based on the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) transmitted through the PUCCH. In this embodiment, the PUCCH can be a first type PUCCH or a second type PUCCH.

[0269] As an example, if the information transmitted in the PUCCH includes HARQ-ACK for the PDSCH, the terminal transmits the PUCCH at a predetermined position regardless of the dynamic slot configuration information indicated by the group-common PDCCH. Here, the determined position is indicated in the DCI scheduling the PDSCH.

[0270] As another example, if the information transmitted in the PUCCH does not include HARQ-ACK for the PDSCH, the terminal transmits the PUCCH when the flexible symbols overlapping with the PUCCH are indicated as UL symbols by the dynamic slot configuration information.

[0271] As another example, if the dynamic slot configuration information indicates that at least one of the symbols to which the PUCCH is allocated is a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic slot configuration information for the symbol to which the PUCCH is allocated, the terminal does not transmit the PUCCH.

[0272] On the other hand, if at least one of the symbols to which the PUCCH is allocated overlaps with a flexible symbol configured by semi-static DL / UL assignment, the terminal may determine whether to transmit the PUCCH according to signaling triggering transmission of the PUCCH.

[0273] As an example, if the PUCCH is triggered by DCI, the terminal transmits the PUCCH at a predetermined position regardless of the dynamic time slot configuration information. Here, the determined position is indicated in the DCI.

[0274] As another example, if the PUCCH is triggered by a UE-specific RRC message, the terminal transmits the PUCCH when the symbol to which the PUCCH is allocated is indicated as a UL symbol by the dynamic slot configuration information.

[0275] As another example, if the dynamic slot configuration information indicates that at least one of the symbols to which the PUCCH is allocated is a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic slot configuration information for the symbol to which the PUCCH is allocated, the terminal does not transmit the PUCCH.

[0276] Method for handling repeated PUCCH

[0277] The terminal can repeatedly send PUCCH over several time slots. This PUCCH is referred to as repeated PUCCH hereinafter. In this embodiment, the repeated PUCCH can be a first type PUCCH or a second type PUCCH. The base station can configure the number of time slots in which repeated PUCCH is sent to the terminal through an RRC message. Then, in each time slot, the start symbol and end symbol of the PUCCH can be the same for each repeated time slot. Hereinafter, repeated PUCCH may be sent or may not be sent according to each case of configuring DL symbols, UL symbols and flexible symbols through RRC such as semi-static DL / UL assignment information (or default time slot mode) and dynamic time slot configuration information. Hereinafter, the method for processing repeated PUCCH in each case will be described.

[0278] When repeated PUCCH overlaps with UL symbols

[0279] If the PUCCH is repeated in each time slot indicated to be transmitted and is located in the UL symbol configured with the semi-static DL / UL assignment information (or the default time slot mode), the terminal can repeatedly transmit the PUCCH in multiple time slots regardless of the reception of dynamic time slot configuration information or scheduling information. Here, the DL and UL symbols configured according to the time slot configured by the RRC message such as the semi-static DL / UL assignment information (or the default time slot mode) are not changed by the dynamic time slot configuration information or scheduling information.

[0280] When repeated PUCCH overlaps with DL symbols

[0281] If at least one of the symbols allocated to the repeated PUCCH in each of the time slots in which the repeated PUCCH is transmitted overlaps with a DL symbol according to the semi-static DL / UL assignment information, the terminal does not transmit the PUCCH in the corresponding time slot or transmits the PUCCH by changing the length of the remaining symbols except the corresponding DL symbol. Alternatively, if at least one of the symbols allocated to the repeated PUCCH in one of the time slots indicated to transmit the repeated PUCCH overlaps with a DL symbol configured with the semi-static DL / UL assignment information (or the default time slot mode), the terminal does not transmit the repeated PUCCH in the next time slot and the corresponding time slot.

[0282] When repeated PUCCH overlaps with flexible symbols

[0283] If at least one of the symbols to which the repeated PUCCH is allocated in each time slot among the time slots in which the repeated PUCCH is transmitted overlaps with a flexible symbol configured by semi-static DL / UL allocation, the terminal may determine whether to transmit the repeated PUCCH i) according to the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) transmitted through the repeated PUCCH, ii) according to the signaling triggering PUCCH transmission, or iii) according to dynamic time slot configuration information. In this embodiment, the repeated PUCCH may be a first type PUCCH or a second type PUCCH.

[0284] On the one hand, if at least one of the symbols to which the repeated PUCCH is allocated overlaps with the flexible symbols configured by semi-static DL / UL allocation, the terminal can determine whether to send the repeated PUCCH based on the type (HARQ-ACK, RI, CSI, etc.) of information (i.e., UCI) sent through the repeated PUCCH.

[0285] As an example, if the information transmitted via the repeated PUCCH includes HARQ-ACK for the PDSCH scheduled by the PDCCH, the terminal transmits the repeated PUCCH at a predetermined position regardless of the dynamic slot configuration information indicated by the group-common PDCCH. Here, the determined position is indicated in the DCI that schedules the PDSCH.

[0286] As another example, if the information transmitted through the repeated PUCCH does not include HARQ-ACK for the PDSCH, the terminal transmits the repeated PUCCH when the flexible symbols overlapping with the repeated PUCCH are indicated as UL symbols through the dynamic slot configuration information.

[0287] As another example, if at least one of the symbols to which the repeated PUCCH is allocated is indicated as a different symbol (e.g., a DL symbol or a flexible symbol) other than a UL symbol by the dynamic slot configuration information, the terminal does not send the repeated PUCCH in the slot. Alternatively, if the terminal fails to receive the dynamic slot configuration information about the symbol to which the repeated PUCCH is allocated, the terminal does not send the repeated PUCCH in the slot. Even if the repeated PUCCH is not sent in the corresponding slot, when a certain condition is met in the next slot (when the flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by the dynamic slot configuration information), the terminal sends the repeated PUCCH in the next slot.

[0288] As another example, when a terminal does not send a repeated PUCCH in one of the time slots in which it is instructed to send a repeated PUCCH due to some reason (a contradiction in the symbol direction caused by dynamic time slot configuration information, or the terminal fails to receive the dynamic time slot configuration information), the terminal does not perform repeated transmission of the PUCCH even in subsequent time slots.

[0289] Meanwhile, on the other hand, if at least one of the symbols to which the repeated PUCCH is allocated overlaps with a flexible symbol configured by semi-static DL / UL assignment, the terminal may determine whether to send the repeated PUCCH according to the signaling triggering the repeated PUCCH transmission.

[0290] As an example, if repeated PUCCH is triggered by DCI, the terminal transmits repeated PUCCH at a predetermined position regardless of dynamic slot configuration information. Here, the determined position is indicated in the DCI.

[0291] As another example, if the repeated PUCCH is triggered by a UE-specific RRC message, when the symbol to which the repeated PUCCH is allocated is indicated as a UL symbol by the dynamic slot configuration information, the terminal transmits the repeated PUCCH.

[0292] As another example, if at least one of the symbols to which the repeated PUCCH is allocated is indicated as a different symbol (e.g., a DL symbol or a flexible symbol) other than a UL symbol by the dynamic slot configuration information, the terminal does not send the repeated PUCCH in the slot. Alternatively, if the terminal fails to receive the dynamic slot configuration information about the symbol to which the repeated PUCCH is allocated, the terminal does not send the repeated PUCCH in the slot. Even if the repeated PUCCH is not sent in the corresponding slot, when a certain condition is met in the next slot (when the flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by the dynamic slot configuration information), the terminal sends the repeated PUCCH in the next slot.

[0293] As another example, when the terminal does not send repeated PUCCH in the corresponding time slot due to some reason (inconsistency in symbol direction caused by dynamic time slot configuration information, or the terminal fails to receive dynamic time slot configuration information), the terminal does not perform repeated transmission of PUCCH even in subsequent time slots.

[0294] Here, the number K of slots in which PUCCH transmission is repeated (or attempted) may be defined as follows.

[0295] As an example, the K time slots configured for transmitting repeated PUCCH do not have to be consecutive. For example, when the terminal is configured to repeatedly transmit PUCCH during K time slots, PUCCH can be repeatedly transmitted until the count of the number of time slots actually transmitted, excluding time slots in which repeated PUCCH is not transmitted, reaches K. (Repetition method 1)

[0296] As another example, the K time slots configured for transmitting repeated PUCCHs should be consecutive. For example, when the terminal is configured to repeatedly transmit PUCCH during K time slots, PUCCH can be repeatedly transmitted until the count of the number of time slots (including time slots in which repeated PUCCHs are not transmitted) reaches K starting from time slot N in which repeated PUCCHs are transmitted. That is, the terminal that first attempts to transmit PUCCH in time slot N attempts to transmit PUCCH until time slot (N+K-1), and even if the number of times (or time slots) that PUCCH is actually repeatedly transmitted is less than K, the terminal no longer transmits PUCCH in time slot (N+K). (Repetition method 2)

[0297] As another example, the terminal attempts to transmit a repeated PUCCH in K consecutive slots from the slot N indicated to transmit the repeated PUCCH, excluding the slot in which the PUCCH cannot be transmitted according to the semi-static DL / UL assignment information. (Repetition method 3)

[0298] FIG15 is a diagram illustrating time slots in which repeated PUCCHs are transmitted according to time slot configuration.

[0299] Referring to FIG15(a), when a terminal is configured to repeatedly transmit a first-type PUCCH 1500 over two time slots (based on a time slot configuration for semi-static DL / UL allocation), the terminal transmits the first-type PUCCH 1500. In this case, the flexible symbols can be changed to DL symbols or UL symbols by dynamic time slot configuration information or scheduling information of a UE-specific DCI. Assume that the symbols in which the first-type PUCCH 1500 is transmitted in a time slot are symbols 8 to 13. Here, a time slot includes 14 symbols, and the symbol indexes are from 0 to 13.

[0300] Looking at each slot configuration based on semi-static DL / UL allocation, symbol 0 in slot 0 is a DL symbol, and symbols 7 through 13 are UL symbols. In slot 1, symbols 0 through 10 are DL symbols, and symbols 12 through 13 are UL symbols. In slot 2, symbols 0 through 1 are DL symbols, and symbols 10 through 13 are UL symbols. In slot 3, symbol 0 is a DL symbol, and symbols 7 through 13 are UL symbols. Symbols other than the UL and DL symbols are flexible symbols.

[0301] Therefore, regardless of the dynamic time slot configuration information, the first type PUCCH1500 can be sent in time slot 0 and time slot 3, and cannot be sent in time slot 1 regardless of the dynamic time slot configuration information, and can be sent if symbol 8 and symbol 9 are indicated as UL symbols by the dynamic time slot configuration information, otherwise, they cannot be sent.

[0302] FIG15( a ) illustrates a time slot in which a terminal attempts to transmit a first-type PUCCH 1500 according to the aforementioned repetition method 1. Here, it is assumed that symbols 8 and 9 of time slot 2 are not indicated as UL symbols by the dynamic time slot configuration information, so that the terminal cannot transmit the first-type PUCCH. The terminal actually transmits the first-type PUCCH 1500 twice, in time slot 0 and time slot 3. Therefore, the terminal no longer repeats transmitting the first-type PUCCH 1500 after time slot 3.

[0303] FIG15( b) illustrates time slots for attempting to transmit a first type PUCCH 1500 using the above-described repetition method 2. Since the first type PUCCH 1500 is configured to be repeatedly transmitted in two time slots (K=2), the terminal attempts to transmit the first type PUCCH 1500 in time slot 0 and time slot 1. The terminal attempts to transmit the first type PUCCH in time slot 1, but cannot transmit the first type PUCCH because it overlaps with a DL symbol according to the configuration of the semi-static DL / UL assignment information.

[0304] FIG15( c ) illustrates a time slot for attempting to transmit the first type PUCCH 1500 using the above-described repetition method 3. The first type PUCCH 1500 is configured to be repeatedly transmitted in two time slots (K=2), but time slot 1 is a time slot in which the first type PUCCH 1500 cannot be transmitted due to semi-static DL / UL assignment information. Therefore, the terminal attempts to transmit the first type PUCCH 1500 in time slots 0 and 2. Here, as indicated by the dynamic time slot configuration information, time slot 2 may or may not actually transmit the first type PUCCH 1500.

[0305] [Another embodiment]

[0306] Another embodiment of the present disclosure is a method for transmitting physical channels by a terminal or a base station to improve physical channel coverage in a wireless communication system based on a time slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols, and a determination process related thereto. The physical channels transmitted by the terminal are uplink physical channels and include PRACH, PUCCH, PUSCH, SRS, etc. The physical channels transmitted by the base station are downlink physical channels and include PDSCH, PDCCH, PBCH, etc. Hereinafter, a process of a terminal and a base station for repeated transmission of PUCCH is defined, and a process of a terminal and a base station for repeated transmission of PUSCH is defined, and a process of a terminal and a base station for a repeated transmission method of PDSCH is defined. In the following embodiments, PUCCH or repeated PUCCH may be a first type PUCCH or a second type PUCCH.

[0307] Terminal and base station procedures for repeated transmission of PUCCH

[0308] The number of time slots in which the PUCCH is transmitted or the number of repetitions of the PUCCH transmission can be, for example, one of a plurality of predetermined values ​​(i.e., 1, 2, 4, and 8), and the value configured to the actual terminal among the plurality of values ​​is sent through the RRC message. If the number of repetitions of the PUCCH transmission is set to 1, it indicates that the normal PUCCH replaces the repeated PUCCH.

[0309] The start and length of the symbol in which the PUCCH in the time slot is transmitted are configured by being included in a PUCCH resource configured by the RRC parameters. A PUCCH resource set including at least one PUCCH resource can be configured or allocated to the terminal through RRC signaling. At the same time, the base station can indicate at least one PUCCH resource index in the PUCCH resource set to the terminal through dynamic signaling (i.e., DCI). For example, the base station can indicate the PUCCH resource index to the terminal based on the PUCCH resource indicator (PRI) included in the DCI or a combination of PRI and implicit mapping. Here, the PRI can be 2 bits or 3 bits.

[0310] In this way, the configured PUCCH resource set or PUCCH resource index can be kept the same across multiple time slots in which the PUCCH is repeatedly transmitted. The terminal determines whether to transmit the PUCCH indicated by the DCI. This determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for the determination may include at least one of UL-DL configuration common information TDD-UL-DL-ConfigurationCommon that can be indicated by RRC signaling and additional UL-DL configuration dedicated information TDD-UL-DL-ConfigDedicated that can be indicated to the terminal by RRC signaling.

[0311] As an example, the UL-DL configuration common information indicates a period in which the semi-static DL / UL assignment information is applied, and the number of DL symbols, the number of UL symbols, and the number of flexible symbols configured on a plurality of slots included in the period.

[0312] As another example, the UL-DL configuration-specific information may include information for overwriting flexible symbols in a semi-static DL / UL slot configuration in which the UL symbols, DL symbols, and flexible symbols are provided by the UL-DL configuration-common information. That is, the terminal may overwrite the flexible symbols in the slot format provided by the UL-DL configuration-common information with another type of symbol based on the UL-DL configuration-specific information.

[0313] If, in a time slot for PUCCH transmission indicated by the base station, a symbol in which PUCCH is to be transmitted overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit PUCCH based on the direction of the indicated symbol.

[0314] As an example, if the indicated symbol is a DL symbol, the terminal postpones transmission of the PUCCH to the next slot, and one of the indicated symbols is a UL symbol and a flexible symbol, the terminal transmits the PUCCH in the corresponding slot.

[0315] As another example, if the indicated symbol is a DL symbol or a flexible symbol, the terminal postpones the transmission of the PUCCH to the next time slot, and if the indicated symbol is a UL symbol, the terminal transmits the PUCCH in the corresponding time slot. The PUCCH not transmitted in the corresponding time slot may be postponed to the next time slot.

[0316] The terminal repeatedly transmits PUCCH over multiple time slots until the number of repetitions of PUCCH transmission configured by the RRC message is reached. When determining the time slot for transmitting PUCCH over multiple time slots, the terminal can consider UL symbols and unknown (or flexible) symbols by the information transmitted in the RRC message. As an example, the terminal may determine the time slot included in the UL symbol and the flexible symbol in which the PUCCH starting position and the number of UL symbols are configured by the RRC message as the time slot resource for performing PUCCH transmission. The base station may receive a PUCCH in which the terminal performs repeated transmission over multiple time slots based on at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information.

[0317] If at least one of the symbols for transmitting PUCCH in the first time slot among the time slots to which repeated PUCCH transmission is allocated overlaps with a DL symbol, the terminal cancels PUCCH transmission and does not transmit PUCCH in the time slot. That is, if the symbols for transmitting PUCCH in the first time slot among the time slots to which repeated PUCCH transmission is allocated consist of UL symbols and flexible symbols, the terminal can transmit PUCCH in the corresponding time slot. If at least one of the symbols for transmitting PUCCH in the first time slot among the time slots to which repeated PUCCH transmission is allocated overlaps with a DL symbol, the terminal cancels PUCCH transmission and does not transmit PUCCH in the time slot. That is, if the time slot in which PUCCH transmission is indicated by the base station in the time slot after the first time slot among the time slots to which repeated PUCCH transmission is allocated and the symbol of the time slot are configured with a UL symbol, that is, a symbol indicated to transmit PUCCH, the terminal can transmit PUCCH in the corresponding time slot.

[0318] Hereinafter, a PUCCH processing method associated with gap symbols is disclosed.

[0319] There may be a gap between DL symbols and UL symbols due to DL-UL switching. The gap may be located in a flexible symbol. That is, some of the flexible symbols between DL symbols and UL symbols may be used for the DL-UL switching gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G may be fixed to a specific value, such as 1 or 2, configured in the terminal via an RRC message, or obtained from a timing advance value.

[0320] If, in each time slot for PUCCH transmission indicated by the base station, the symbol in which the PUCCH is to be transmitted overlaps with the symbol configured by the semi-static UL / DL assignment information (at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information), the terminal determines whether to send the PUCCH based on the type (or direction) of the indicated symbol.

[0321] As an example, if all indicated symbols are UL symbols, the terminal transmits the PUCCH, and if at least one of the indicated symbols consists of a DL symbol or one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit the PUCCH in the corresponding time slot. The terminal may postpone the PUCCH not transmitted in the corresponding time slot to the next time slot.

[0322] That is, in a time slot indicated by the base station for PUCCH transmission, if the symbol in which the PUCCH is to be transmitted is a UL symbol, the terminal transmits the PUCCH, and if the symbol in which the PUCCH is to be transmitted overlaps with a DL symbol or at least one of the G consecutive flexible symbols immediately following the DL symbol, the terminal does not transmit the PUCCH in that time slot. The terminal may postpone the PUCCH not transmitted in the corresponding time slot to the next time slot. That is, when the PUCCH overlaps with any of the DL symbols and the G symbols used as gaps, the PUCCH may not be transmitted, and transmission may be postponed to the next time slot.

[0323] Meanwhile, regarding the PUCCH processing method in multiple time slots, the terminal repeatedly transmits the PUCCH until the number of repetitions of PUCCH transmission configured by the RRC message in multiple time slots is reached. The terminal can determine the time slot for transmitting the PUCCH in multiple time slots based on the type and number of symbols according to the information sent in the RRC message.

[0324] The terminal determines the time slot for PUCCH transmission based on the number of UL symbols, the number of flexible symbols, and the number of gap symbols configured by the semi-static UL / DL assignment information. For example, when the "number of UL symbols + the number of flexible symbols - the number of gap symbols" in the time slot includes the starting position of the PUCCH and the number of UL symbols to which the PUCCH is to be transmitted, the terminal can determine the corresponding time slot as the time slot for transmitting the PUCCH and transmit the PUCCH. Alternatively, when considering that one time slot includes 14 symbols, if "14-(the number of DL symbols in the time slot + the number of gap symbols)" includes the starting position of the PUCCH and the number of UL symbols to which the PUCCH is to be transmitted, the terminal can determine the corresponding time slot as the time slot for transmitting the PUCCH and transmit the PUCCH.

[0325] In this case, the base station may receive a PUCCH in which the terminal performs repeated transmission through a plurality of slots based on at least one of UL-DL configuration common information and UL-DL configuration dedicated information.

[0326] FIG16 shows whether to transmit the PUCCH according to the slot configuration.

[0327] 16 , the slot configuration configured according to the semi-static DL / UL assignment information sequentially includes five DL symbols (denoted as “D”), three flexible symbols (denoted as “X”), and six UL symbols (denoted as “U”).

[0328] PUCCH allocation #0 is configured with PUCCH resources from the 8th symbol to the 14th symbol, PUCCH allocation #1 is configured with PUCCH resources from the 7th symbol to the 14th symbol, and PUCCH allocation #3 is configured with PUCCH resources from the 6th symbol to the 14th symbol.

[0329] First, Figure 16(a) illustrates the case where symbol G = 1 is provided as a gap. If G = 1, PUCCH allocation #0 and PUCCH allocation #1 can be transmitted without overlapping with a flexible symbol immediately following a DL symbol, but PUCCH allocation #2 cannot be transmitted without overlapping with a flexible symbol immediately following a DL symbol. In this case, the transmission of PUCCH allocation #2 can be postponed to the next time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #2 in the next time slot based on the same criteria.

[0330] First, FIG16 (b) illustrates a case where two symbols (G=2) are provided as a gap. If G=2, PUCCH allocation #0 that does not overlap with two consecutive or flexible symbols immediately following a DL symbol can be transmitted, but PUCCH allocation #1 and PUCCH allocation #2 that overlap with two consecutive flexible symbols immediately following a DL symbol cannot be transmitted. In this case, the transmission of PUCCH allocation #1 and #2 can be postponed to the next time slot. Of course, the terminal also determines whether to transmit PUCCH allocation #1 and #2 in the next time slot based on the same criteria.

[0331] Terminal and base station process of repeated transmission of PUCCH

[0332] The number of time slots in which the PUSCH is transmitted or the number of repetitions of the PUCCH transmission may be, for example, one of a plurality of predetermined values ​​(i.e., 1, 2, 4, and 8), and the value configured to the actual terminal among the plurality of values ​​may be sent via an RRC message. If the number of repetitions of the PUSCH transmission is set to 1, it indicates that the normal PUSCH is used instead of the repeated PUSCH.

[0333] In case of the PUSCH, the PUSCH is transmitted only in a slot configuration suitable for PUSCH transmission among K consecutive slots, and a delay operation of the PUSCH transmission is not performed.

[0334] The start and length of the symbol in which the PUSCH is transmitted in a time slot are indicated by the DCI and may be kept the same in all time slots. The terminal determines whether to transmit the PUSCH indicated by the DCI. This determination may be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for the determination may include at least one of UL-DL configuration common information TDD-UL-DL-ConfigurationCommon that may be indicated by RRC signaling and additional UL-DL configuration dedicated information TDD-UL-DL-ConfigDedicated that may be indicated to the terminal by RRC signaling.

[0335] As an example, the UL-DL configuration common information indicates a period for applying the semi-static DL / UL assignment information and is used to configure a slot format and the number of slots, where the slot format is configured with the number of UL symbols per slot, the number of DL / UL symbols per slot, and the number of flexible symbols per slot configured over a plurality of slots included in the period. That is, the terminal can configure the slot format for each slot over the number of slots indicated by the UL-DL configuration common information. As another example, the UL-DL configuration specific information may include information for overwriting the flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration common information with UL symbols, DL symbols, and flexible symbols. That is, the terminal can overwrite the flexible symbols in the slot format provided by the UL-DL configuration common information with another type of symbol based on the UL-DL configuration specific information.

[0336] If, in each time slot for PSCCH transmission indicated by the base station, the symbol in which the PUSCH is to be transmitted overlaps with the symbol indicated by the semi-static UL / DL assignment information (at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information), the terminal determines whether to send the PUSCH based on the type (or direction) of the indicated symbol.

[0337] As an example, if at least one of the indicated symbols is a DL symbol, the terminal does not transmit a PUSCH and cancels PUSCH transmission. In addition, if the indicated symbols are UL symbols and flexible symbols, the terminal transmits a PUSCH in the corresponding time slot.

[0338] As another example, if at least one of the indicated symbols is a DL symbol or a flexible symbol, the terminal does not transmit a PUSCH and cancels PUSCH transmission. In addition, if the indicated symbol is a UL symbol, the terminal transmits a PUSCH in the time slot.

[0339] If at least one of the symbols in which PUSCH is transmitted overlaps with a DL symbol in the first time slot among the time slots indicated for repeated PUSCH transmission, the terminal cancels PUSCH transmission and does not transmit PUSCH in the time slot. That is, if the symbols in which PUSCH is transmitted in the first time slot among the time slots indicated for repeated PUSCH transmission consist of UL symbols and flexible symbols, the terminal can transmit PUSCH in the corresponding time slot. If at least one of the symbols in which PUSCH is transmitted overlaps with a DL symbol or a flexible symbol in the time slots subsequent to the first time slot among the time slots indicated for repeated PUSCH transmission, the terminal cancels PUSCH transmission and does not transmit PUSCH in the corresponding time slot. That is, if the symbols in which PUSCH is transmitted in the time slots subsequent to the first time slot among the time slots indicated for repeated PUSCH transmission are configured with UL symbols, the terminal can transmit PUSCH in the corresponding time slot.

[0340] Hereinafter, a PUSCH processing method associated with gap symbols is disclosed.

[0341] There may be a gap for DL-UL switching between DL symbols and UL symbols. The gap may be located in a flexible symbol. Some of the flexible symbols between the DL and UL symbols may be used for the DL-UL switching gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G may be fixed to a specific value, such as 1 or 2, may be configured in the terminal via an RRC message, or may be obtained from a timing advance value.

[0342] If, in each time slot for PUSCH transmission indicated by the base station, the symbol in which the PUSCH is to be transmitted overlaps with the symbol indicated by the semi-static UL / DL assignment information (at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the indicated symbol.

[0343] As an example, if all indicated symbols are UL symbols, the terminal transmits PUCCH, and if at least one of the indicated symbols is a DL symbol or G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit PUSCH in the corresponding time slot.

[0344] That is, in each time slot indicated by the base station for PUSCH transmission, if the symbol in which the PUSCH is to be transmitted is a UL symbol, the terminal transmits the PUSCH, and if at least one of the symbols in which the PUSCH is to be transmitted overlaps with a DL symbol or at least one of G consecutive flexible symbols immediately following the DL symbol, the terminal cancels PUSCH transmission and does not perform PUSCH transmission. In other words, when overlapping with any of the DL symbol and the G symbols used as gaps, the PUSCH may not be transmitted and PUSCH transmission is canceled.

[0345] Terminal and base station procedures for repeated reception of PDSCH

[0346] The number of time slots in which the PDSCH is received or the number of repetitions of PDSCH reception may be, for example, one of a plurality of predetermined values ​​(i.e., 1, 2, 4, and 8), and may be a value configured to the actual terminal among a plurality of values ​​sent through an RRC message. If the number of repetitions of PDSCH reception is set to 1, it indicates that a normal PDSCH replaces the repeated PDSCH.

[0347] The start and length of the symbol in which the PDSCH is received in the time slot are indicated by the DCI and can be kept the same in all time slots. The terminal determines whether to receive the PDSCH indicated by the DCI. This determination can be based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for the determination can include at least one of UL-DL configuration common information TDD-UL-DL-ConfigurationCommon that can be indicated by RRC signaling, and additional UL-DL configuration dedicated information TDD-UL-DL-ConfigDedicated that can be indicated to the terminal by RRC signaling.

[0348] As an example, the UL-DL configuration common information indicates a period for applying semi-static DL / UL assignment information and is used to configure a slot format and the number of slots. The slot format is configured with the number of UL symbols per slot, the number of DL / UL symbols per slot, and the number of flexible symbols per slot, configured across multiple slots included in the period. That is, the terminal can configure the slot format for each slot at the number of slots indicated by the UL-DL configuration common information. As another example, the UL-DL configuration specific information may include information for overwriting flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration common information with UL symbols, DL symbols, and flexible symbols. That is, based on the UL-DL configuration specific information, the terminal can overwrite flexible symbols in the slot configuration provided by the UL-DL configuration common information with another symbol.

[0349] If, in the time slot for PDSCH reception indicated by the base station, the symbol in which the terminal is to receive PDSCH overlaps with the symbol indicated by the semi-static UL / DL assignment information (at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

[0350] As an example, if at least one of the indicated symbols is a UL symbol, the terminal does not perform PDSCH reception. On the other hand, if the indicated symbols are DL symbols and flexible symbols, the terminal may receive PDSCH in the corresponding time slot.

[0351] As another example, if at least one of the indicated symbols is a UL symbol or unknown (or flexible symbol), the terminal does not receive the PDSCH. On the other hand, if the indicated symbol is a DL symbol, the terminal receives the PDSCH in the corresponding time slot.

[0352] If at least one of the symbols in which the PDSCH is received overlaps with a UL symbol in the first slot among the slots indicated by repeated PDSCH reception, the terminal does not receive the PDSCH in the corresponding slot. That is, if the symbol in which the PDSCH is received in the first slot among the slots indicated for receiving repeated PDSCH consists of a DL symbol and a flexible symbol, the terminal can receive the PDSCH in the corresponding slot. In addition, if at least one of the symbols in which the PDSCH is received overlaps with a UL symbol or a flexible symbol in a slot following the first slot among the slots indicated for receiving repeated PDSCH, the terminal does not receive the PDSCH in the corresponding slot. That is, if the symbol of the slot indicated to receive the PDSCH by the base station and the symbol of the slot indicating the time slot to receive the PDSCH include a DL symbol in a slot following the first slot among the slots indicated for receiving repeated PDSCH, the terminal can receive the PDSCH in the corresponding slot. At the same time, the terminal can receive the PDSCH that is not additionally received in the next slot that is postponed.

[0353] Hereinafter, a PDSCH processing method associated with gap symbols is disclosed.

[0354] There may be a gap for DL-UL switching between DL symbols and UL symbols. The gap may be located in a flexible symbol. Some of the flexible symbols between the DL and UL symbols may be used for the DL-UL switching gap and may not be used for DL ​​reception or UL transmission. Let G be the number of symbols used for the gap. G may be fixed to a specific value, such as 1 or 2, may be configured in the terminal via an RRC message, or may be obtained from a timing advance value.

[0355] If, in a time slot for PDSCH reception indicated by the base station, a symbol in which the PDSCH is to be received overlaps with a symbol indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

[0356] As an example, if the indicated symbols are all DL symbols, the terminal receives the PDSCH, and if at least one of the indicated symbols is a UL symbol or G consecutive flexible symbols immediately before the UL symbol, the terminal does not receive the PDSCH.

[0357] That is, in a time slot indicated by the base station for PDSCH reception, if the symbol in which the PDSCH is to be received is a DL symbol, the terminal receives the PDSCH, and if the symbol in which the PDSCH is to be received overlaps with a UL symbol or at least one of G consecutive flexible symbols preceding the UL symbol, the terminal does not perform PDSCH reception. That is, when the symbol in which the PDSCH is to be transmitted overlaps with any one of the UL symbol and the G symbols used as gaps, the base station cancels the transmission of the PDSCH and does not transmit the PDSCH. The base station then postpones the transmission of the PDSCH to the next time slot.

[0358] On the other hand, if the terminal cancels PDSCH reception according to the semi-static DL / UL assignment information, since the HARQ-ARQ timing may be changed, a new HARQ-ARQ timing configuration method needs to be defined.

[0359] On the one hand, when the reception of the PDSCH is canceled, the new HARQ-ARQ timing can be determined based on the received PDSCH when the new HARQ-ARQ timing is not canceled. In other words, in order to determine the time slot in which the actual HARQ-ACK is transmitted, the terminal can use the last received PDSCH in addition to the HARQ-ACK timing and the canceled PDSCH included in the DCI indicating the PDSCH reception. For example, a terminal indicated with 4 time slots in the HARQ-ACK timing can send HARQ-ACK after 4 time slots from the time slot in which the last PDSCH was received.

[0360] On the other hand, even when the reception of the PDSCH is canceled, the HARQ-ARQ timing can be determined assuming that the HARQ-ARQ timing is not changed and the PDSCH is received. In other words, in order to determine the time slot in which the actual HARQ-ACK is transmitted, the terminal can perform calculations based on the HARQ-ACK timing included in the DCI indicating the reception of the PDSCH and the last PDSCH before determining whether to cancel. For example, even if the reception of the PDSCH is canceled, the terminal indicated by 4 time slots according to the HARQ-ACK timing can send HARQ-ACK after 4 time slots from the last time slot of the allocated PDSCH.

[0361] At the same time, the terminal can be configured to perform inter-slot frequency hopping to achieve frequency diversity. Therefore, even when the terminal repeatedly transmits PUCCH (or PDSCH or PUSCH) to multiple time slots, it is necessary to define a method for the terminal to perform frequency hopping between time slots. This embodiment discloses which physical resource block (PRB) the PUCCH (or PDSCH, or PUSCH) is transmitted through in each time slot during frequency hopping between time slots. In addition, this embodiment discloses an algorithm for determining the PRB based on the difference between the time slot in which the PUCCH is first transmitted and the current time slot, regardless of the number of times the PUCCH is repeatedly transmitted.

[0362] In one aspect, the inter-slot hopping method in PUCCH transmission includes determining, by the terminal, a resource block (RB) in which the PUCCH is to be transmitted based on an index of a first slot and an index of a second slot in which the repeated PUCCH is first transmitted. Here, the RB in slot n can be obtained by Equation 7. s The starting RB index of one RB or multiple RBs for sending PUCCH.

[0363] [Equation 7]

[0364]

[0365] In Equation 7, RB1 and RB2 are respectively sent to the terminal as the starting RB indexes of the first hop and the second hop through an RRC message and configured in the terminal. s,0 is the index of the time slot in which the PUCCH is first transmitted. When the PUCCH is repeatedly transmitted according to the delay of repeating the PUCCH, this scheme can be transmitted by only one hop.

[0366] On the other hand, the inter-slot frequency hopping method in PUCCH transmission includes: frequency hopping is performed whenever the terminal actually transmits a repeated PUCCH. The RB can be determined by the slot index through which the PUCCH is transmitted and the actual number of repetitions. More specifically, the RB in slot n can be obtained by Equation 8. sThe starting RB index of one RB or multiple RBs for sending PUCCH.

[0367] [Equation 8]

[0368]

[0369] In Equation 8, RB1 and RB2 are respectively sent to the terminal as the starting RB indexes of the first hop and the second hop through an RRC message and configured in the terminal. repeat (n s ) is time slot n s The number of previous PUCCH retransmissions. In this method, regardless of the delay of repeating PUCCH, PUCCH can be sent through two different hops.

[0370] [Another embodiment]

[0371] In addition to the method and determination process of repeatedly transmitting PUCCH over multiple time slots to improve PUCCH coverage, another embodiment of the present disclosure further discloses a method of determining in which time slot among multiple time slots to perform PUCCH repeated transmission.

[0372] Hereinafter, a method of determining a time slot for PUCCH transmission of a terminal among a plurality of time slots is disclosed.

[0373] On the one hand, the terminal can determine the time slot for PUCCH transmission based on the SS / PBCH block including the synchronization signal for radio resource management (RRM) measurement and the information about the initial cell connection. The SS / PBCH block can be transmitted at a predetermined position, and the configuration for the transmission of the SS / PBCCH block can be configured in the terminal by sending from the base station to the terminal via an RRC message (i.e., SSB_transmitted-SIB1 information or SSB_transmitted). In the time slot indicated by the configuration for the transmission of the SS / PBCH block, there may be flexible symbols in which the SS / PBCH block can be transmitted. That is, the flexible symbols can be used not only for PUCCH transmission, but also for the transmission of the SS / PBCH block including information about synchronization and initial cell access. In this case, there may be a situation where the flexible symbols for transmitting the SS / PBCH block and the flexible symbols for transmitting the PUCCH at least partially overlap.

[0374] As an example, the terminal determines the time slot for repeating the PUCCH by excluding the time slot including overlapping symbols from the time slot for repeated PUCCH transmission, thereby preventing collisions. In this way, the terminal determines multiple time slots for transmitting the PUCCH based on SSB_transmitted-SIB1 and SSB_transmitted, and if the PUCCH is repeatedly transmitted on multiple time slots, the base station can receive the repeated PUCCH from the terminal.

[0375] On the other hand, the terminal may determine the time slot for PUCCH transmission based on the semi-static DL / UL assignment information and the gap.

[0376] In the following description, it is assumed that the gap is located in the symbol immediately before the symbol used for PUCCH transmission, and it is assumed that the gap includes one or two symbols. However, the position of the DL-UL switching gap between DL and UL and the number of symbols may be configured differently depending on the configuration of the base station and the terminal. For example, the gap may include two or more symbols, and the terminal may consider two or more gap symbols to determine the time slot for PUCCH transmission or determine whether to postpone PUCCH transmission.

[0377] On the other hand, time slot determination can be performed based on whether PDSCH is allocated in the time slot, whether a control resource set (CORESET) for monitoring PDCCH in DL symbols in the time slot is allocated, whether CSI-RS is allocated in the time slot, whether SS / PBCH blocks are allocated in the time slot, and at least one of semi-static DL / UL assignment information.

[0378] As an example, in order to determine the PUCCH transmission resource in a flexible symbol, if the symbol immediately before the flexible symbol is a DL symbol and the PDSCH is allocated to the DL symbol, the terminal does not regard the flexible symbol as a resource for PUCCH transmission. Instead, the terminal can determine the time slot including other UL symbols and flexible symbols as the time slot for PUCCH transmission. If the symbol immediately before the flexible symbol is a DL symbol and no PDSCH is allocated to the DL symbol, the flexible symbol becomes an unallocated symbol. Therefore, the terminal does not regard the unallocated symbol as a gap for DL-UL switching. The terminal can then determine the flexible symbol immediately after the DL symbol as a resource that can repeat PUCCH transmission and determine it as the time slot for PUCCH transmission.

[0379] As another example, in order to determine the PUCCH transmission resources in a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol and the CORESET or search space for PDCCH monitoring is allocated to the DL symbol, the terminal can exclude the time slot including the flexible symbol from the time slot for repeated PUCCH transmission to facilitate monitoring of the allocated PDCCH.

[0380] As another example, in order to determine the PUCCH transmission resources in a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol and the CORESET or search space for PDCCH monitoring is allocated to the DL symbol, the terminal does not monitor the allocated PDCCH, and the flexible symbol can be regarded as a resource capable of repeated PUCCH transmission and determined as a time slot for PUCCH transmission.

[0381] As another example, the terminal may use semi-static DL / UL assignment information to determine a time slot for PUCCH transmission. The terminal may be informed of in which time slot the PUCCH should be transmitted through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PUCCH transmission overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately preceding the symbol indicated for PUCCH transmission is not a DL symbol indicated in the semi-static DL / UL assignment information, the terminal may determine the corresponding time slot as a time slot for repeated PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUCCH is transmitted is a DL symbol indicated in the semi-static DL / UL assignment information, the terminal may postpone the PUCCH transmission to the next available time slot without transmitting repeated PUCCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUCCH is to be transmitted from an RRC message and / or dynamic signaling (e.g., PRI), and at least one of the symbols overlaps with a DL symbol of semi-static DL / UL assignment information, or the symbol immediately before the symbol in which the PUCCH is to be transmitted is a DL symbol of semi-static DL / UL assignment information, the terminal does not transmit the PUCCH in the time slot, and if not, the terminal transmits the PUCCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUCCH can be postponed to the next available time slot.

[0382] As another example, the terminal may determine the time slot for PUCCH transmission using information scheduled for the terminal. The terminal may be informed through RRC messages and dynamic signaling (e.g., PRI) in which time slot the PUCCH should be sent. If at least one of the symbols indicated to transmit the PUCCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and the PDSCH is not scheduled to the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal may determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if the PDSCH is scheduled in the symbol immediately preceding the symbol in which the PUCCH is transmitted, the terminal may postpone the PUCCH transmission to the next available time slot while not transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUCCH is to be transmitted from an RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of the semi-static DL / UL assignment information, or a PDSCH is scheduled in a symbol immediately before the symbol in which the PUCCH is to be transmitted, the terminal does not transmit the PUCCH in that time slot, and if not, the terminal transmits the PUCCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUCCH can be postponed to the next available time slot.

[0383] As another example, the terminal may determine the time slot for PUCCH transmission using CSI-RS information configured in the terminal. The terminal may be informed of the time slot in which the PUCCH should be transmitted through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to transmit the PUCCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately preceding the symbol indicated for PUCCH transmission, the terminal may determine the corresponding time slot as the time slot for PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if CSI-RS reception is scheduled in the symbol immediately preceding the symbol in which the PUCCH is transmitted, the terminal may postpone the PUCCH transmission to the next available time slot while not transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUCCH is to be transmitted from RRC messages and / or dynamic signaling (e.g., PRIPRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or CSI-RS reception is scheduled in the symbol immediately before the symbol in which the PUCCH is to be transmitted, the terminal does not transmit the PUCCH in the corresponding time slot, and if not, the terminal transmits the PUCCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUCCH can be postponed to the next available time slot.

[0384] As another example, the terminal may determine the time slot for PUCCH transmission using PDCCH monitoring information configured in the terminal. The terminal may be informed in which time slot the PUCCH should be sent through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to send the PUCCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or allocated) in the symbol immediately before the symbol indicated to send the PUCCH, the terminal may determine the corresponding time slot as the time slot for PUCCH transmission and send the PUCCH in the corresponding time slot. On the other hand, if PDCCH monitoring is configured (or allocated) in the symbol immediately before the symbol in which the PUCCH is to be sent, the terminal may postpone the PUCCH transmission to the next available time slot without sending the PUCCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUCCH is to be transmitted from an RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of semi-static DL / UL assignment information, or PDCCH monitoring is configured in a symbol immediately before the symbol in which the PUCCH is to be transmitted, the terminal will not transmit the PUCCH in that time slot, and if not, the terminal transmits the PUCCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUCCH can be postponed to the next available time slot.

[0385] As another example, the terminal may learn in which time slot the PUCCH should be transmitted through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to transmit the PUCCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PUCCH does not overlap with the SS / PBCH block immediately preceding the symbol indicated for transmission, the terminal may determine the corresponding time slot as a time slot for PUCCH transmission and transmit the PUCCH in the corresponding time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUCCH is transmitted overlaps with the SS / PBCH block, the terminal may postpone the PUCCH transmission to the next available time slot while not transmitting the PUCCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUCCH is to be transmitted from an RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of the semi-static DL / UL assignment information, or the symbol immediately before the symbol in which the PUCCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUCCH in that time slot, and if not, the terminal transmits the PUCCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUCCH can be postponed to the next available time slot.

[0386] In this embodiment, if the symbol indicated as a DL symbol by dynamic signaling Dynamic SFI in a time slot ends at the symbol immediately before the symbol for repeated PUCCH transmission, and the PUCCH resource is configured so that transmission for repeated PUCCH is performed starting from the next symbol, the terminal can postpone the time slot to a later time slot while not transmitting the PUCCH in the time slot. The postponed time slot can be the first time slot among the time slots in which the PUCCH can be transmitted.

[0387] Hereinafter, a method of determining a time slot for PUCCH transmission according to whether a terminal allocates a PDSCH in a time slot will be described by a more specific example. In this case, it is assumed that one time slot includes 14 symbols.

[0388] For example, assume that the UL symbol resources for PUCCH are configured with the last 12 symbols of the time slot, and the specific time slot includes two DL symbols, two flexible symbols, and ten UL symbols in sequence. When PDSCH is allocated to two DL symbols immediately before the two flexible symbols, the terminal implicitly regards the first flexible symbol as a switching gap between DL and UL. The terminal then determines whether one flexible symbol and 10 UL symbols other than the first flexible symbol can be configured as PUCCH resources. However, because the UL symbol resources for PUCCH are configured with the last 12 symbols of the time slot, the terminal can exclude the time slot from the time slot resources used for PUCCH transmission. In the above example, if the UL symbol resources for PUCCH are configured with the last 11 symbols of the time slot, the terminal can determine the time slot as the time slot resource for PUCCH transmission.

[0389] In addition, for example, assume that the UL symbol resources for PUCCH are configured with the last six symbols of the time slot, and the specific time slot includes eight DL symbols, two flexible symbols, and four UL symbols in sequence. When PDSCH is allocated to two DL symbols immediately before the two flexible symbols, the terminal implicitly regards the first flexible symbol as a switching gap between DL and UL. The terminal then determines whether one flexible symbol and four UL symbols other than the first flexible symbol can be configured as PUCCH resources. However, because the UL symbol resources for PUCCH are configured with the last 6 symbols of the time slot, the terminal can exclude the time slot from the time slot resources used for PUCCH transmission. In the above example, if the UL symbol resources for PUCCH are configured with the last 5 symbols of the time slot, the terminal can determine the time slot as the time slot resource for PUCCH transmission.

[0390] [Another embodiment]

[0391] In addition to the method and determination process for repeatedly transmitting a PUSCH over multiple time slots to improve PUSCH coverage, another embodiment of the present disclosure further discloses a method for determining in which time slot among multiple time slots to perform PUSCH repeated transmission.

[0392] On the other hand, the time slot in which the PUSCH is to be sent may be determined based on whether a PDSCH is allocated in the time slot, whether a control resource set (CORESET) for monitoring the PDCCH in the DL symbol is allocated in the time slot, whether a CSI-RS is allocated in the time slot, whether an SS / PBCH block is allocated in the time slot, and at least one of semi-static DL / UL assignment information.

[0393] As an example, the terminal may use the semi-static DL / UL assignment information to determine the time slot for PUSCH transmission. The terminal may be informed in which time slot the PUSCH should be sent through an RRC message and dynamic signaling (e.g., PRI). If the symbol indicated for PUSCH transmission overlaps with the flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately preceding the symbol indicated for PUSCH transmission is not the DL symbol indicated in the semi-static DL / UL assignment information, the terminal may determine the corresponding time slot as the time slot for PUSCH transmission and send the PUSCH in the corresponding time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUSCH is transmitted is the DL symbol indicated in the semi-static DL / UL assignment information, the terminal may postpone the PUSCH transmission to the next available time slot without sending the PUSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUSCH is to be transmitted from an RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of semi-static DL / UL assignment information, or the symbol immediately before the symbol in which the PUSCH is to be transmitted is a DL symbol of semi-static DL / UL assignment information, the terminal does not transmit the PUSCH in that time slot, and if not, the terminal transmits the PUSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUSCH can be postponed to the next available time slot.

[0394] As another example, the terminal may determine the time slot for PUSCH transmission using information scheduled for the terminal. The terminal may be informed through RRC messages and dynamic signaling (e.g., PRI) in which time slot the PUSCH should be sent. If at least one of the symbols indicated to send the PUSCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and the PDSCH is not scheduled to the symbol immediately before the symbol indicated for PUSCH transmission, the terminal may determine the corresponding time slot as the time slot for PUSCH transmission and send the PUSCH in the corresponding time slot. On the other hand, if the PDSCH is scheduled in the symbol immediately before the symbol in which the PUSCH is transmitted, the terminal may postpone the PUSCH transmission to the next available time slot while not sending the PUSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in which the PUSCH is to be transmitted in each time slot from RRC messages and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of semi-static DL / UL assignment information, or a PDSCH is scheduled in a symbol immediately before the symbol in which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in that time slot, and if not, the terminal transmits the PUSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUSCH can be postponed to the next available time slot.

[0395] As another example, the terminal may determine the time slot for PUSCH transmission using the CSI-RS information configured in the terminal. The terminal may be informed through RRC messages and dynamic signaling (e.g., PRI) in which time slot the PUSCH should be sent. If at least one of the symbols indicated to send the PUSCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal may determine the corresponding time slot as the time slot for PUSCH transmission and send the PUSCH in the corresponding time slot. On the other hand, if CSI-RS reception is configured in the symbol immediately preceding the symbol to which the PUSCH is to be sent, the terminal does not send the PUSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUSCH is to be transmitted from RRC messages and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with a DL symbol of semi-static DL / UL assignment information, or CSI-RS reception is scheduled in a symbol immediately before the symbol in which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in that time slot, and if not, the terminal transmits the PUSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUSCH can be postponed to the next available time slot.

[0396] As another example, the terminal may determine the time slot for PUSCH transmission using PDCCH monitoring information configured in the terminal. The terminal may be informed through RRC messages and dynamic signaling (e.g., PRI) in which time slot the PUSCH should be sent. If at least one of the symbols indicated to send the PUSCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or allocated) in the symbol immediately before the symbol indicated to send the PUSCH, the terminal may determine the corresponding time slot as the time slot for PUSCH transmission and send the PUSCH in the corresponding time slot. On the other hand, if PDCCH monitoring is configured (or allocated) in the symbol immediately before the symbol in which the PUSCH is to be sent, the terminal does not send the PUSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PUSCH is to be transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or PDCCH monitoring is configured in the symbol immediately before the symbol in which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in the corresponding time slot, and if not, the terminal transmits the PUSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUSCH can be postponed to the next available time slot.

[0397] As another example, the terminal may learn in which time slot the PUSCH should be transmitted through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to transmit the PUSCH overlaps with a flexible symbol indicated in the semi-static DL / UL assignment information, and the PUSCH does not overlap with the SS / PBCH block immediately preceding the symbol indicated for transmission, the terminal may determine the corresponding time slot as a time slot for PUSCH transmission and transmit the PUSCH in the corresponding time slot. On the other hand, if the symbol immediately preceding the symbol in which the PUSCH is to be transmitted overlaps with the SS / PBCH block, the terminal does not transmit the PUSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot in which the PUSCH is to be transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or the symbol immediately before the symbol in which the PUSCH is transmitted overlaps with the SS / PBCH block, the terminal does not transmit the PUSCH in the time slot, and if not, the terminal transmits the PUSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PUSCH can be postponed to the next available time slot.

[0398] [Another embodiment]

[0399] In addition to the method and determination process of repeatedly transmitting a PUSCH over multiple time slots to improve PUSCH coverage, another embodiment of the present disclosure further discloses a method of determining in which time slot among multiple time slots to perform PUSCH repetition transmission.

[0400] Meanwhile, determination of a slot to receive the PDSCH is performed based on at least one of whether PUSCH is allocated in the slot, whether PUCCH is allocated, whether SRS transmission is allocated, whether PRACH transmission is allocated, and semi-static DL / UL assignment information.

[0401] As an example, the terminal may use semi-static DL / UL assignment information to determine a time slot for PDSCH reception. The terminal may be informed of the time slot in which the PDSCH should be received through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PDSCH reception overlaps with the flexible symbol indicated in the semi-static DL / UL assignment information, and if the symbol immediately following the symbol indicated for PDSCH reception is not the UL symbol indicated in the semi-static DL / UL assignment information, the terminal may determine the corresponding time slot as the time slot for PDSCH reception and receive the PDSCH in the corresponding time slot. On the other hand, if the symbol immediately following the symbol for receiving the PDSCH is the UL symbol indicated in the semi-static DL / UL assignment information, the terminal does not receive the PDSCH in the corresponding time slot. In other words, if the terminal can obtain the symbols in each time slot in which PDSCH is to be received from RRC messages and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the UL symbol of the semi-static DL / UL assignment information, or the symbol immediately after the symbol in which PDSCH is to be sent is the UL symbol of the semi-static DL / UL assignment information, then the terminal will not receive PDSCH in the time slot, and if not, the terminal receives PUCCH in the corresponding time slot.

[0402] As another example, the terminal may determine the time slot for PDSCH reception using uplink information (PUSCH, PUCCH, PRACH, SRS, etc.) scheduled for the terminal. The terminal may be informed of the time slot in which the PDSCH should be received through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated for PDSCH reception overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and if the PDSCH is not scheduled with PDSCH, PUCCH, PRACH, or SRS in the symbol immediately following the symbol indicated for reception, the terminal may determine the corresponding time slot as the time slot for PDSCH reception and receive the PDSCH in the corresponding time slot. On the other hand, if PUSCH, PUCCH, PRACH, or SRS is scheduled in the symbol immediately following the symbol in which the PDSCH is to be received, the terminal does not receive the PDSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in which the PDSCH is to be received in each time slot from the RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the UL symbol of the semi-static DL / UL assignment information, or the PUSCH or PUCCH or PRACH or SRS is scheduled in the symbol immediately after the symbol in which the PDSCH is transmitted, the terminal does not receive the PDSCH in the time slot, and if not, the terminal receives the PUCCH in the corresponding time slot. Here, the PUCCH may be a PUCCH for transmitting HARQ-ACK. Alternatively, the PUCCH may be a PUCCH for transmitting a scheduling request (SR).

[0403] As another example, the terminal can determine the time slot for PDSCH transmission using CSI-RS information configured in the terminal. The terminal can be informed of in which time slot the PDSCH should be sent through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to receive the PDSCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and CSI-RS reception is not configured in the symbol immediately before the symbol indicated for PDSCH reception, the terminal can determine the corresponding time slot as the time slot for PDSCH transmission and send the PDSCH in the corresponding time slot. On the other hand, if CSI-RS reception is scheduled in the symbol immediately before the symbol in which the PDSCH is transmitted, the terminal can postpone the PDSCH transmission to the next available time slot while not sending the PDSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot where the PDSCH is to be transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or CSI-RS reception is scheduled in the symbol immediately before the symbol in which the PDSCH is to be transmitted, the terminal does not transmit the PDSCH in the time slot, otherwise the terminal transmits the PDSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PDSCH can be postponed to the next available time slot.

[0404] As another example, the terminal can use the PDCCH monitoring information configured in the terminal to determine the time slot for PDSCH transmission. The terminal can be informed of in which time slot the PDSCH should be sent through RRC messages and dynamic signaling (e.g., PRI). If at least one of the symbols indicated to receive the PDSCH overlaps with the flexible symbols indicated in the semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or allocated) in the symbol immediately before the symbol in which the PUCCH is to be transmitted, the terminal can determine the corresponding time slot as the time slot for PDSCH transmission and send the PDSCH in the corresponding time slot. On the other hand, if PDCCH monitoring is configured (or allocated) in the symbol immediately before the symbol in which the PDSCH is to be transmitted, the terminal can postpone the PDSCH transmission to the next available time slot while not sending the PDSCH in the corresponding time slot. In other words, if the terminal can learn the symbols in each time slot in which the PDSCH is to be transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and at least one of these symbols overlaps with the DL symbol of the semi-static DL / UL assignment information, or PDSCH monitoring is configured in the symbol immediately before the symbol in which the PUCCH is to be transmitted, the terminal does not transmit the PDSCH in the time slot, and if not, the terminal transmits the PDSCH in the corresponding time slot. This is because a switching gap between DL and UL may be required. Here, the untransmitted PDSCH can be postponed to the next available time slot.

[0405] As another example, an SS / PBCH block may be configured to overlap with DL symbols, flexible symbols, and UL symbols in the semi-static DL / UL assignment information for a terminal. In this case, the terminal may consider the symbols overlapping with the SS / PBCH block to be semi-static DL symbols. That is, if a semi-static UL symbol is configured in the terminal and the SS / PBCH block overlaps with the symbol, the terminal may assume that the symbol is configured as a semi-static DL symbol. In addition, if the symbol immediately following the symbol overlapping with the SS / PBCH block is a semi-static UL symbol, the terminal may assume that the semi-static UL symbol is a semi-static flexible symbol.

[0406] [Another embodiment]

[0407] According to another embodiment of the present invention, a terminal is unable to perform both downlink reception and uplink transmission due to insufficient gaps between DL symbols requiring downlink reception and UL symbols requiring uplink transmission. At least a DL-UL switching gap is required between downlink reception and uplink transmission at the terminal. Here, the DL-UL switching gap can be used interchangeably as a switching gap or simply as a gap, and aside from the expression, they have equivalent meanings.

[0408] The length of the DL-UL switching gap may vary depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or lower (hereinafter referred to as frequency range (FR) 1), the DL-UL switching gap may require 13 us. Alternatively, if the carrier frequency is 6 GHz or higher (hereinafter referred to as FR2), the DL-UL switching gap may require 7 us.

[0409] The DL-UL switching gap is also affected by the timing advance (TA) value and the TA offset value. In addition, the DL-UL switching gap may be affected by the subcarrier spacing. That is, the DL-UL switching gap can be determined based on the TA value and the TA offset value and / or the subcarrier spacing. For example, when the duration of one symbol is X us, the symbol G required for the DL-UL switching gap can be given as G=ceil((Rx2Tx+TA+TA_offset) / X). ​​Here, Rx2Tx can have different values ​​depending on the frequency of the carrier. For example, when the frequency of the carrier is 6 GHz or less (FR1), Rx2Tx can be 13 us, and when it is 6 GHz or greater (FR2), Rx2Tx can be 7 us. TA can be the TA value that the terminal is configured to receive from the base station, or the terminal can be configured to receive the maximum value among the TA values ​​from the base station. TA_offset can be 39936*Tc or 25600*Tc in FR1, and can be 13792*Tc in FR2. Here, Tc=1 / (480*103*4096). Here, the switching gap may be the RF interruption time.

[0410] Table 5 shows an example of the number of symbols required for a DL-UL switching gap according to subcarrier spacing.

[0411] [Table 5]

[0412]

[0413] Table 6 shows another example of the number of symbols required for the DL-UL switching gap according to the subcarrier spacing.

[0414] [Table 6]

[0415]

[0416] Hereinafter, a method for processing transmission of an uplink channel or uplink signal based on a downlink signal received by a terminal and the UL-DL switching gap G will be described. In this embodiment, the downlink signal may include an SS / PBCH block, a PDSCH, a PDCCH, a periodic signal, a measurement signal, etc. In addition, in this embodiment, the uplink channel may include a PUSCH, a PUCCH, a PRACH, etc., and the uplink signal may include an SRS, a periodic signal, a measurement signal, etc.

[0417] SS / PBCH block transmission and uplink transmission symbols

[0418] In one aspect, a method for processing uplink transmission includes: determining, by a terminal, whether at least one of symbols indicated for transmission of an uplink channel or an uplink signal is configured to overlap (i.e., conflict) with symbols of an SS / PBCH block indicated for reception from a base station (or symbols used for SS / PBCH block transmission); and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the symbols of the received SS / PBCH block are configured to overlap with the transmission of the uplink channel or the transmission of the uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and if not, the terminal transmits the uplink signal.

[0419] In another aspect, a method for processing uplink transmission includes determining, by a terminal, whether at least one of symbols indicated for transmission of an uplink channel or an uplink signal is configured to overlap with a symbol to which an SS / PBCH block indicated for reception from a base station is allocated, and transmitting the uplink channel or the uplink signal based on this determination. Here, if at least some of the G symbols are configured to overlap with the transmission of the uplink channel or the uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and if not, the terminal transmits the uplink signal.

[0420] Symbols used for downlink and uplink transmissions

[0421] On the other hand, a method for processing uplink transmission includes: determining, by a terminal, whether at least one of symbols indicated for transmission of an uplink channel or transmission of an uplink signal is configured to overlap with a symbol indicated to receive a downlink transmission from a base station (or a symbol for downlink transmission), and transmitting the uplink channel or uplink signal based on this determination. Here, if at least some of the symbols received for downlink transmission are configured to overlap with the transmission of the uplink channel or transmission of the uplink signal, the terminal does not transmit the uplink channel or uplink signal, and if not, the terminal transmits the uplink signal.

[0422] In another aspect, a method for processing uplink transmission includes determining, by a terminal, whether at least one of symbols indicated for transmission of an uplink channel or an uplink signal is configured to overlap with G symbols following a symbol indicated to receive a downlink transmission from a base station, and transmitting the uplink channel or the uplink signal based on this determination. Here, if at least some of the G symbols are configured to overlap with the transmission of the uplink channel or the uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and if not, the terminal transmits the uplink signal.

[0423] On the other hand, this embodiment may include the base station performing scheduling (i.e., dynamic scheduling of layer 1 L1) so that symbols used for downlink transmission and symbols used for uplink transmission do not overlap with each other. In other words, when the base station performs scheduling for the terminal, uplink transmission can be configured based on G symbols. In this case, the terminal may not expect the base station to configure the terminal's uplink transmission in G symbols.

[0424] Alternatively, in this embodiment, the case where uplink transmission is configured based on RRC configuration rather than dynamic scheduling of L1 includes the terminal determining whether the uplink transmission configured with RRC overlaps with the G symbol and determining whether to perform or not perform transmission of the uplink channel or signal by the terminal based on this.

[0425] Hereinafter, a method is disclosed in which a terminal processes downlink reception and transmission of uplink channels (or uplink signals) based on a UL-DL switching gap G. In this embodiment, downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. In addition, in this embodiment, uplink channels may include PUSCH, PUCCH, PRACH, etc., and uplink signals may include SRS.

[0426] Process downlink signals based on whether flexible symbols overlap with uplink signals

[0427] In symbols configured by flexible symbols through semi-static DL / UL assignment information or symbols not configured by semi-static DL / UL assignment information, the terminal may or may not receive a downlink signal (i.e., a downlink periodic signal or a measurement signal) configured through a UE-specific RRC message. In this case, the method by which the terminal processes the configured downlink reception may be based on an arrangement relationship (e.g., an overlapping relationship) between the UL-DL switching gap and the uplink signal.

[0428] In one aspect, a method for a terminal to process a configured downlink reception may include: determining whether the terminal is configured to send an uplink signal within G symbols after the last symbol of the configured downlink signal, and receiving the configured downlink signal based on the determination. Here, as a result of the determination, if the uplink signal does not overlap in the G symbols after the last symbol of the configured downlink signal, the terminal can receive the configured downlink signal. Conversely, if the uplink signal overlaps in the G symbols, the terminal does not receive the configured downlink signal. In other words, if there are no at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0429] Here, the uplink signal may include an uplink signal configured by a cell-specific RRC message. For example, the uplink signal configured by a cell-specific RRC message may include PRACH.

[0430] Alternatively, the uplink signal may include an uplink signal indicated by L1 signaling. As an example, the uplink signal indicated by L1 signaling may include a PUSCH scheduled in DCI format 0_0 or 0_1. As another example, the uplink signal indicated by L1 signaling may include a PUCCH including a HARQ-ACK response to a PDSCH scheduled in DCI format 1_0 or 1_1. As another example, the uplink signal indicated by L1 signaling may include an SRS signal indicated by DCI. As another example, the uplink signal indicated by L1 signaling may include the first transmission in an uplink semi-persistently scheduled (SPS) PDSCH transmission indicated by a DCI scrambled with a CS-RNTI.

[0431] In addition, the downlink signal may include a CSI-RS configured by a UE-specific RRC message. As an example, the downlink signal may include a CORESET for PDCCH monitoring configured by a UE-specific RRC message. As another example, the downlink signal may include a downlink SPS PDSCH transmission (in addition to the first transmission) scrambled with a CS-RNTI.

[0432] In another aspect, a method for a terminal to process downlink reception may include: determining, by the terminal, whether UL symbols configured by semi-static DL / UL assignment information overlap within G symbols after the last symbol of a downlink signal; and receiving the downlink signal based on this determination. As a result of the determination, if the UL symbols configured by the semi-static DL / UL assignment information overlap within G symbols, the terminal does not receive the downlink signal, and if not, the terminal receives the downlink signal. In other words, if there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0433] On the other hand, a method for a terminal to process a configured downlink reception may include: determining, by the terminal, whether the UL symbol indicated by the dynamic SFI overlaps within G symbols after the last symbol of the configured downlink signal, and receiving the configured downlink signal based on this determination. As a result of the determination, when the UL symbol indicated by the dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal, and if not, the terminal receives the downlink signal. In other words, if there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0434] On the other hand, a method for a terminal to process configured downlink reception may include: determining, by the terminal, whether DL symbols configured by semi-static DL / UL assignment information overlap within G symbols preceding the first symbol of a downlink signal, and receiving the configured downlink signal based on this determination. As a result of the determination, if the DL symbols configured by the semi-static DL / UL assignment information overlap within G symbols, the terminal does not receive the configured downlink signal, and if not, the terminal receives the configured downlink signal. In other words, if there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0435] On the other hand, a method for a terminal to process configured downlink reception may include: determining, by the terminal, whether a DL symbol indicated by a dynamic SFI overlaps within G symbols preceding the first symbol of an uplink signal; and receiving the configured downlink signal based on this determination. As a result of this determination, if the DL symbol indicated by the dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal, and if not, the terminal receives the configured downlink signal. In other words, if there are at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol allocated to the uplink signal in a time slot, the terminal discards the downlink signal.

[0436] Here, a method for a terminal to process uplink transmission may include: in a symbol configured by a flexible symbol according to semi-static DL / UL assignment information or in a symbol not configured according to semi-static DL-UL assignment information, the terminal does not expect an operation of configuring or indicating an uplink signal through an L1 signal during G symbols after a downlink signal (downlink periodic signal or measurement signal) configured through a UE-specific RRC message.

[0437] Processing of uplink signals based on whether flexible symbols overlap with downlink signals

[0438] In symbols configured with flexible symbols according to semi-static DL / UL assignment information or symbols not configured according to semi-static DL / UL assignment information, the terminal may or may not transmit an uplink signal (i.e., an uplink periodic signal or a measurement signal) configured by a UE-specific RRC message. In this case, the method by which the terminal processes uplink transmission can be determined based on the arrangement relationship (e.g., overlapping relationship) between the UL-DL switching gap and the downlink signal.

[0439] In one aspect, a method for a terminal to process a configured uplink transmission may include: sending the configured uplink signal based on whether the terminal receives a downlink signal in G symbols before the first symbol of the configured uplink signal. That is, if the downlink signal does not overlap in the G symbols before the first symbol of the configured uplink signal, the terminal may send the configured uplink signal. Conversely, if the downlink signal overlaps in the G symbols, the terminal does not send the configured uplink signal. In other words, if there are no at least G gap symbols between the first UL symbol configured by semi-static DL / UL assignment information and the last symbol allocated to the downlink signal in a time slot, the terminal discards the uplink signal.

[0440] Here, the downlink signal may include a downlink signal configured by a cell-specific RRC message. As an example, the downlink signal configured by the cell-specific RRC message may include an SS / PBCH block. As another example, the downlink signal configured by the cell-specific RRC message may include a type 0 common search space. Here, the type 0 common search space is a search space for receiving remaining minimum scheduling information (RMSI). As another example, the downlink signal configured by the cell-specific RRC message may include a type 0A common search space. Here, the type 0A common search space is a search space for receiving a response to a PRACH in a random access procedure.

[0441] Alternatively, the downlink signal may include a downlink signal indicated by L1 signaling. As an example, the uplink signal indicated by L1 signaling may include a PDSCH scheduled in DCI format 1_0 or 1_1. As another example, the uplink signal indicated by L1 signaling may include an aperiodic CSI-RS indicated by DCI. As another example, the uplink signal indicated by L1 signaling may include a first transmission of an uplink semi-persistently scheduled (SPS) PDSCH transmission indicated by a DCI scrambled with a CS-RNTI.

[0442] At the same time, the uplink signal may include an SRS configured by a UE-specific RRC message. As an example, the uplink signal may include a periodic PUCCH and PUSCH configured by a UE-specific RRC message. As another example, the uplink signal may include an SR configured by a UE-specific RRC message.

[0443] On the other hand, a method for a terminal to process a configured uplink transmission may include: determining whether DL symbols configured by semi-static DL / UL assignment information overlap in G symbols preceding the first symbol of the configured uplink signal, and transmitting the configured uplink signal by the terminal based on this determination. As a result of the determination, if the DL symbols configured by the semi-static DL / UL assignment information do not overlap in G symbols, the terminal transmits the configured uplink signal, and if not, the terminal does not transmit the configured uplink signal. In other words, if there are at least G gap symbols between the first UL symbol configured by the semi-static DL / UL assignment information and the last symbol allocated to the downlink signal in a time slot, the terminal discards the uplink signal.

[0444] Here, a method for a terminal to process uplink transmission may include: in a symbol configured by a flexible symbol according to semi-static DL / UL assignment information or in a symbol not configured according to semi-static DL-UL assignment information, the terminal does not expect an operation of configuring or indicating an uplink signal through an L1 signal during G symbols after a downlink signal (downlink periodic signal or measurement signal) configured through a UE-specific RRC message.

[0445] In symbols configured by flexible symbols according to semi-static DL / UL assignment information or in symbols not configured according to semi-static DL / UL assignment information, if the number of symbols between the last symbol of a downlink signal configured by a cell-specific RRC message or indicated by L1 signaling and the first symbol of an uplink signal configured by a cell-specific RRC message or indicated by L1 signaling is less than G, the terminal operates as follows.

[0446] As an example, the terminal may receive a downlink signal configured by a cell-specific RRC message, but may not transmit an uplink signal configured by a cell-specific RRC message or indicated by L1 signaling.

[0447] As another example, the terminal may transmit an uplink signal configured by a cell-specific RRC message, and may not receive a downlink signal configured by a cell-specific RRC message or indicated by L1 signaling.

[0448] As another example, a terminal may operate according to L1 signaling. That is, when L1 signaling indicates downlink reception and a cell-specific RRC message configures uplink transmission, the terminal may perform downlink reception and may not perform uplink transmission. Conversely, if L1 signaling indicates uplink reception and a cell-specific RRC message configures downlink transmission, the terminal may perform uplink transmission and may not perform downlink reception.

[0449] Figure 17 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention, respectively. In an embodiment of the present invention, a UE can be implemented by various types of wireless communication devices or computing devices that are guaranteed to be portable and mobile. The UE may be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), etc. In addition, in an embodiment of the present invention, the base station controls and manages a cell (e.g., a macro cell, a femto cell, a pico cell, etc.) corresponding to a service area, and performs functions such as signal transmission, channel designation, channel monitoring, self-diagnosis, and relaying. The base station may be referred to as a next-generation node B (gNB) or an access point (AP).

[0450] As shown in the figure, the UE 100 according to an embodiment of the present invention may include a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150. The terminal 100 is a terminal described in the embodiments of this specification and can perform operations and processes according to each embodiment of this specification. Specifically, according to each embodiment of this specification, the communication module 120 performs operations for the terminal to send or receive an object, and the processor 110 can perform operations such as generating, determining, and deciding other objects.

[0451] First, the processor 110 can execute various instructions or programs within the UE 100 and process data. In addition, the processor 110 can control the overall operation of each unit including the UE 100 and can control the transmission / reception of data between the units. Here, the processor 110 can be configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 110 can receive time slot configuration information, determine a time slot configuration based on the time slot configuration information, and perform communication according to the determined time slot configuration.

[0452] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards (NICs) in an internal or external form, such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123. In the drawings, the communication module 120 is shown as an integrally integrated module, but unlike the drawings, each network interface card may be independently arranged according to circuit configuration or purpose.

[0453] The cellular communication interface card 121 can transmit or receive radio signals with at least one of the base station 200, an external device, and a server using a mobile communication network, and provide cellular communication services in a first frequency band based on instructions from the processor 110. According to an embodiment, the cellular communication interface card 121 may include at least one NIC module that uses a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 121 can independently perform cellular communication with at least one of the base station 200, an external device, and a server in a frequency band less than 6 GHz supported by the corresponding NIC module according to a cellular communication standard or protocol.

[0454] The cellular communication interface card 122 can transmit or receive radio signals with at least one of the base station 200, an external device, and a server using a mobile communication network, and provide cellular communication services in the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 may include at least one NIC module that uses a frequency band greater than 6 GHz. The at least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, an external device, and a server in a frequency band of 6 GHz or greater supported by the corresponding NIC module according to a cellular communication standard or protocol.

[0455] The unlicensed band communication interface card 123 transmits or receives radio signals with at least one of the base station 200, an external device, and a server using a third frequency band that is an unlicensed frequency band, and provides communication services in the unlicensed frequency band based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses the unlicensed frequency band. For example, the unlicensed frequency band may be a 2.4 GHz or 5 GHz frequency band. The at least one NIC module of the unlicensed band communication interface card 123 may independently or non-independently perform wireless communication with at least one of the base station 200, an external device, and a server according to an unlicensed frequency band communication standard or frequency band protocol supported by the corresponding NIC module.

[0456] The memory 130 stores control programs and various data therefor used in the UE 100. Such control programs may include prescribed programs required for performing wireless communications with at least one of the base station 200, an external device, and a server.

[0457] Next, the user interface 140 includes various input / output devices provided in the UE 100. In other words, the user interface 140 can receive user input using various input devices, and the processor 110 can control the UE 100 based on the received user input. In addition, the user interface 140 can perform output based on instructions from the processor 110 using various output devices.

[0458] Next, the display unit 150 outputs various images on the display screen. The display unit 150 may output various display objects such as content or a user interface executed by the processor 110 based on a control instruction from the processor 110.

[0459] In addition, the base station 200 according to an embodiment of the present invention may include a processor 210, a communication module 220, and a memory 230. The base station 200 is a base station described in each embodiment of this specification, and may perform operations and processes of the base station corresponding to the operations and processes of the terminal according to each embodiment of this specification. Specifically, according to each embodiment of this specification, the communication module 220 performs operations of receiving or transmitting objects by the base station, and the processor 210 may perform operations such as generating, determining, and deciding other objects.

[0460] First, the processor 210 can execute various instructions or programs and process internal data of the base station 200. In addition, the processor 210 can control the overall operation of the units in the base station 200 and control the transmission and reception of data between the units. Here, the processor 210 can be configured to perform operations according to the embodiments described in the present invention. For example, the processor 210 can signal a time slot configuration and perform communication based on the signaled time slot configuration.

[0461] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 220 may include a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in an internal or external form. In the drawings, the communication module 220 is shown as an integrally integrated module, but unlike the drawings, each network interface card may be independently arranged according to circuit configuration or purpose.

[0462] The cellular communication interface card 221 can transmit or receive radio signals with at least one of the base station 100, an external device, and a server using a mobile communication network, and provide cellular communication services in a first frequency band based on instructions from the processor 210. According to an embodiment, the cellular communication interface card 221 may include at least one NIC module that uses a frequency band less than 6 GHz. The at least one NIC module of the cellular communication interface card 221 can independently perform cellular communication with at least one of the base station 100, an external device, and a server in a frequency band less than 6 GHz supported by the corresponding NIC module according to a cellular communication standard or protocol.

[0463] The cellular communication interface card 222 can transmit or receive radio signals with at least one of the base station 100, an external device, and a server using a mobile communication network, and provide cellular communication services in the second frequency band based on instructions from the processor 210. According to an embodiment, the cellular communication interface card 222 may include at least one NIC module that uses a frequency band of 6 GHz or higher. The at least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the base station 100, an external device, and a server in a frequency band of 6 GHz or higher supported by the corresponding NIC module according to a cellular communication standard or protocol.

[0464] The unlicensed band communication interface card 223 transmits or receives radio signals with at least one of the base station 100, an external device, and a server using a third frequency band that is an unlicensed frequency band, and provides communication services in the unlicensed frequency band based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module that uses an unlicensed frequency band. For example, the unlicensed frequency band may be a 2.4 GHz or 5 GHz frequency band. The at least one NIC module of the unlicensed band communication interface card 223 may independently or non-independently perform wireless communication with at least one of the base station 100, an external device, and a server according to an unlicensed frequency band communication standard or frequency band protocol supported by the corresponding NIC module.

[0465] Figure 17 1 is a block diagram illustrating a UE 100 and a base station 200 according to an embodiment of the present invention, and the blocks shown are logically divided components of the device. Therefore, depending on the design of the device, the above-mentioned components of the device can be installed in a single chip or multiple chips. In addition, a portion of the configuration of the UE 100, such as the user interface 140 and the display unit 150, can be selectively provided in the UE 100. Furthermore, if necessary, the user interface 140, the display unit 150, etc. can also be provided in the base station 200.

[0466] The foregoing description of the present disclosure has been provided for purposes of illustration and description. It will be apparent to one of ordinary skill in the art to which the present disclosure relates that the present disclosure may be readily modified into other detailed forms without altering the technical principles or essential features of the present disclosure. Therefore, the embodiments described above are provided for illustrative purposes only and do not limit the present disclosure. For example, each component described as a single type may be implemented in a distributed manner. Similarly, components described as distributed may be implemented in a combined manner.

[0467] The scope of the present disclosure is set forth by the appended claims rather than the foregoing description. It should be understood that all changes or modifications derived from the definition and scope of the claims and their equivalents fall within the scope of the present disclosure.

Claims

1. A terminal for use in a wireless communication system, the terminal comprising: Communication module; and processor, Wherein, the processor is configured to: Identify whether resources for uplink transmission are valid or invalid, Whether the resource used for the uplink transmission is valid or invalid is identified based on the location of the resource used for the uplink transmission and the number of gap symbols between the resource used for the uplink transmission and the resource used for downlink transmission or synchronization signal / physical broadcast channel (PBCH / SS), and When the resources for the uplink transmission are valid, the uplink transmission is performed on the resources for the uplink transmission.

2. The terminal according to claim 1, in, Whether the resources used for the uplink transmission are valid or invalid is identified based on whether the number of gap symbols between the resources used for the uplink transmission and the resources used for the downlink transmission or the PBCH / SS is greater than the number of gap symbols configured between the terminal and the base station.

3. The terminal according to claim 2, in, When the number of gap symbols between the resources used for the uplink transmission and the resources used for the downlink transmission or the PBCH / SS is less than the number of gap symbols configured between the terminal and the base station, the resources for the uplink transmission are invalid.

4. The terminal according to claim 2, in, When the number of gap symbols between the resources used for the uplink transmission and the resources used for the downlink transmission or the PBCH / SS is greater than the number of gap symbols configured between the terminal and the base station, the resources for the uplink transmission are valid.

5. The terminal according to claim 1, in, Whether the resource used for the uplink transmission is valid or invalid is identified based on whether a location of the resource used for the uplink transmission is located before the PBCH / SS. The terminal according to claim 1 , wherein: The processor is further configured to: receiving common configuration information related to the configuration of time slots, The configuration of the time slot includes a downlink symbol set, an uplink symbol set and a flexible symbol set, and the downlink symbol set is followed by the flexible symbol set.

7. A method for performing uplink transmission and downlink reception in a wireless communication system, the method comprising: Identify whether resources for uplink transmission are valid or invalid, Whether the resource used for the uplink transmission is valid or invalid is identified based on a position of the resource used for the uplink transmission and a number of gap symbols between the resource used for the uplink transmission and a resource used for downlink transmission or a synchronization signal / physical broadcast channel (PBCH / SS); and When the resources for the uplink transmission are valid, the uplink transmission is performed on the resources for the uplink transmission.

8. The method according to claim 7, in, Whether the resources used for the uplink transmission are valid or invalid is identified based on whether the number of gap symbols between the resources used for the uplink transmission and the resources used for the downlink transmission or the PBCH / SS is greater than the number of gap symbols configured between the terminal and the base station.

9. The method according to claim 8, in, When the number of gap symbols between the resource used for the uplink transmission and the resource used for the downlink transmission or the PBCH / SS is less than the number of gap symbols configured between the terminal and the base station, the resource for the uplink transmission is invalid.

10. The method according to claim 8, in, When the number of gap symbols between the resources used for the uplink transmission and the resources used for the downlink transmission or the PBCH / SS is greater than the number of gap symbols configured between the terminal and the base station, the resources for the uplink transmission are valid.

11. The method according to claim 7, in, Whether the resource used for the uplink transmission is valid or invalid is identified based on whether a location of the resource used for the uplink transmission is located before the PBCH / SS.

12. The method according to claim 7, further comprising: receiving common configuration information related to the configuration of time slots, The configuration of the time slot includes a downlink symbol set, an uplink symbol set and a flexible symbol set, and the downlink symbol set is immediately followed by the flexible symbol set.

13. The method according to claim 12, in, Whether the resources used for the uplink transmission are valid or invalid is further identified by considering whether the resources used for the uplink transmission are located in the uplink symbol set.

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