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

Abstract

To provide a transmission and reception method of a radio signal by a terminal in a wireless communication system.SOLUTION: According to the present specification, disclosed is a method including the steps of: determining whether or not transmission of an uplink radio signal or reception of a downlink radio signal allocated to a terminal is possible on a slot configured to comprise downlink symbols for downlink transmission, flexible symbols and uplink symbols for uplink transmission; and controlling the transmission of the uplink radio signal or the reception of the downlink radio signal based on the determination. According to the present invention, the terminal can transmit a PUCCH even if the configuration of the slot is changed, and thus PUCCH transmission omission or unnecessary retransmission of the PUCCH can be prevented. Also in other aspect, by means of defining valid timing of the uplink signal such as a PRACH, the frequency efficiency of a network can be increased and the energy consumption of the terminal can be reduced.SELECTED DRAWING: Figure 15a

Description

[Technical field]

[0001] The present invention relates to wireless communications, and more particularly to a method, apparatus and system for transmitting uplink signals and channels and receiving downlink signals and channels in a wireless communications system. [Background technology]

[0002] Following the commercialization of 4G (4th generation) communication systems, efforts are being made to develop new 5G (5th generation) communication systems to meet the increasing demand for wireless data traffic. 5G communication systems are referred to as communication systems beyond 4G networks, systems beyond LTE systems, or new radio (NR) systems. In order to achieve high data transmission rates, 5G communication systems include systems operated using ultra-high frequency (mmWave) bands of 6 GHz or higher, and also include communication systems operated using frequency bands below 6 GHz in terms of ensuring coverage, and implementation in base stations and terminals is being considered.

[0003] The 3GPP (registered trademark, hereinafter the same) (3rd generation partnership project) NR system improves the efficiency of network spectrum, allowing carriers to provide more data and voice services with a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting large capacity voice. The advantages of the NR system are that it has high throughput, low latency, FDD (frequency division duplex) and TDD (time division duplex) support on the same platform, improved end user environment, and low operating costs with a simple architecture.

[0004] For more efficient data processing, the dynamic TDD of the NR system uses a method of varying the number of OFDM (orthogoal frequency division multiplexing) symbols available for uplink and downlink depending on the data traffic direction of the user of the cell. For example, if the downlink traffic of a cell is greater than the uplink traffic, the base station allocates a number of downlink OFDM symbols to a slot (or subframe). Information regarding the slot configuration should be transmitted to the terminal.

[0005] To mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, beamforming, massive array multiple input / output (massive MIMO), full dimension multiple input / output (FD-MIMO), array antenna, analog beam-forming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies are being discussed for 5G communication systems. In addition, to improve the system network, technological developments are being conducted for the 5G communication system regarding advanced small cells, improved small cells, cloud radio access network (cloud RAN), ultra-dense networks, device to device communication (D2D), vehicle to everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving networks, cooperative communication, coordinated multi-points (CoMP), and interference cancellation.In addition, advanced coding modulation (ACM) methods such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are being developed for 5G systems.

[0006] Meanwhile, the Internet is a human-centered network where humans generate and consume information, and is evolving into the Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. The Internet of Everything (IoE) technology is also emerging, which combines big data processing technology through connection with cloud servers with IoT technology. To realize IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, technologies such as sensor networks for connecting objects, machine to machine (M2M), and machine type communication (MTC) are being researched. In the IoT environment, intelligent IT (internet technology) services are provided that collect and analyze data generated from connected objects and create new value in human life. IoT is applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through the fusion and integration of conventional IT technology and various industries.

[0007] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine, and MTC are being embodied by 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access network (cloud RAN), as the big data processing technology mentioned above, is also an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems have been developed to provide voice services while ensuring user activity.

[0008] However, the mobile communication system has gradually expanded its service area from voice to data services, and is currently developed to the extent that it provides high-speed data services. However, due to the resource shortage phenomenon in the currently provided mobile communication system and the demand for high-speed services from users, a more advanced mobile communication system is required.

[0009] The 3GPP NR system uses a dynamic time division duplex (TDD) scheme that can freely change the direction of OFDM symbols that make up a slot depending on the uplink and downlink traffic of a small cell. The base station transmits information about the slot configuration to the terminal to support dynamic TDD. However, there is a risk that the terminal cannot receive the slot configuration information or the terminal cannot operate due to the change in the slot configuration, so a method to improve this is required. Summary of the Invention [Problem to be solved by the invention]

[0010] The technical problem of the present invention is to provide a method, apparatus and system for transmitting and receiving a control channel in a wireless communication system.

[0011] Another technical object of the present invention is to provide a terminal and an operating method thereof for transmitting or receiving a control channel in a situation where a slot configuration including a DL symbol, a flexible symbol, and a UL symbol based on TDD is changed.

[0012] It is still another technical object of the present invention to provide a base station and an operating method thereof for receiving or transmitting a control channel in a situation where a slot configuration including a DL symbol, a flexible symbol, and a UL symbol based on TDD is changed.

[0013] Another technical object of the present invention is to provide a terminal and an operating method thereof for efficiently transmitting or receiving a control channel by taking into account a switching gap in a slot configuration including a DL symbol, a flexible symbol, and a UL symbol based on a TDD system.

[0014] Another technical object of the present invention is to provide a base station and an operating method thereof for efficiently receiving or transmitting a control channel by taking into account switching gaps in a slot configuration including a DL symbol, a flexible symbol, and a UL symbol based on a TDD system. [Means for solving the problem]

[0015] According to one aspect of the present invention, there is provided a terminal for controlling uplink transmission and downlink reception in a wireless communication system, the terminal including: a communication module configured to transmit an uplink radio signal to a base station or receive a downlink radio signal of the base station assigned to the terminal from the base station, a memory configured to store a control program and data used by the terminal, and a processor configured to determine whether transmission of an uplink radio signal assigned to the terminal or reception of the downlink radio signal is available on a slot configured to include at least one of at least one downlink symbol for the downlink transmission, at least one flexible symbol, and at least one uplink symbol for the uplink transmission, and to control transmission of the uplink radio signal or reception of the downlink radio signal according to the determination.

[0016] In one aspect, the uplink radio signal includes a physical uplink control channel (PUCCH), and the processor determines that transmission of the physical uplink control channel is possible when the number of uplink symbols is equal to or greater than a certain number, or when the sum of the number of uplink symbols and the number of flexible symbols is equal to or greater than a certain number.

[0017] In another aspect, if the number of symbols required for transmitting the physical uplink control channel (hereinafter, symbols for transmitting PDCCH) 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 drops the physical uplink control channel, converts the physical uplink control channel to another type of physical uplink control channel requiring a smaller number of symbols, or controls to transmit the physical uplink control channel over at least one slot after the slot.

[0018] In another aspect, the uplink radio signal includes a physical uplink control channel (PUCCH), and a HARQ-ACK is mapped to the PUCCH, and the processor determines that transmission of the HARQ-ACK is impossible or postpones transmission of the HARQ-ACK if the downlink symbol overlaps with a symbol for transmitting the PDCCH.

[0019] In yet another aspect, the downlink radio signal includes a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and the processor determines that the physical downlink shared channel or the physical downlink control channel is capable of transmission when the number of the downlink symbols is equal to or greater than a certain number, or when the sum of the number of the downlink symbols and the number of the flexible symbols is equal to or greater than a certain number.

[0020] In yet another aspect, the downlink radio signal is downlink control information (DCI) included in a physical downlink control channel (PDCCH), and types of the downlink control information include a HARQ-ACK, a rank indicator (RI), and CSI, and the processor determines whether reception of the downlink radio signal is possible based on a priority according to the type of the downlink control information.

[0021] In yet another aspect, the downlink radio signal includes an SS / PBCH block, and the uplink radio signal includes at least one of a physical uplink control channel, a physical uplink shared channel, and a physical random access channel (PRACH).

[0022] In yet another aspect, if transmission of the uplink radio signal begins after a predetermined number of gap symbols from the last symbol of the downlink symbols for transmitting the downlink radio signal, the processor performs transmission of the uplink radio signal.

[0023] In yet another aspect, if the transmission of the uplink radio signal overlaps with at least one of the downlink symbols, the last symbol of the symbols for transmitting the downlink radio signal, and a predetermined number of gap symbols, the processor drops the transmission of the uplink radio signal.

[0024] In yet another aspect, the slot is configured by information regarding a slot configuration provided by the base station, and the information regarding the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a UE-specific RRC message, and dynamic slot format information generated in a physical layer.

[0025] According to another aspect of the present invention, there is provided a method for transmitting and receiving a radio signal by a terminal in a wireless communication system, the method including: determining whether transmission of an uplink radio signal assigned to the terminal or reception of the downlink radio signal is possible on a slot configured to include at least one of at least one downlink symbol for downlink transmission, at least one flexible symbol, and at least one uplink symbol for uplink transmission, and controlling the transmission of the uplink radio signal or the reception of the downlink radio signal based on the determination.

[0026] In one aspect, the uplink radio signal includes a physical uplink control channel (PUCCH), and the controlling step includes a step of transmitting the physical uplink control channel when the number of uplink symbols is equal to or greater than a certain number, or when the sum of the number of uplink symbols and the number of flexible symbols is equal to or greater than a certain number.

[0027] In another aspect, if the number of symbols required for transmitting the physical uplink control channel (hereinafter, symbols for transmitting PDCCH) is greater than the number of uplink symbols or the sum of the number of uplink symbols and the number of flexible symbols, the controlling step includes a step of dropping the physical uplink control channel, converting the physical uplink control channel to another type of physical uplink control channel requiring a smaller number of symbols, or transmitting the physical uplink control channel over at least one slot after the slot.

[0028] In another aspect, the uplink radio signal includes a physical uplink control channel (PUCCH), a HARQ-ACK is mapped to the PUCCH, and the controlling step includes a step of determining that transmission of the HARQ-ACK is impossible or postponing transmission of the HARQ-ACK if the downlink symbol overlaps with a symbol for transmitting the PDCCH.

[0029] In yet another aspect, the downlink radio signal includes a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and the controlling step includes a step of transmitting the physical downlink shared channel or the physical downlink control channel when the number of the downlink symbols is equal to or greater than a certain number, or when the sum of the number of the downlink symbols and the number of the flexible symbols is equal to or greater than a certain number.

[0030] In yet another aspect, the downlink radio signal is downlink control information (DCI) included in a physical downlink control channel (PDCCH), types of the downlink control information include HARQ-ACK, RI, and CSI, and the controlling step determines whether reception of the downlink radio signal is possible based on a priority order according to the type of the downlink control information.

[0031] In yet another aspect, the downlink radio signal includes an SS / PBCH block, and the uplink radio signal includes at least one of a physical uplink control channel, a physical uplink shared channel, and a physical random access channel (PRACH).

[0032] In yet another aspect, if transmission of the uplink radio signal begins after a predetermined number of gap symbols from a last symbol of the downlink symbols for transmission of the downlink radio signal, the controlling step includes a step of transmitting the uplink radio signal.

[0033] In yet another aspect, if the transmission of the uplink radio signal overlaps with at least one of the downlink symbols, a last symbol of the symbols for transmitting the downlink radio signal, and a predetermined number of gap symbols, the controlling step includes a step of dropping the transmission of the uplink radio signal.

[0034] In yet another aspect, the slot is configured by information regarding a slot configuration provided by the base station, and the information regarding the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a terminal-specific RRC message, and dynamic slot format information generated in a physical layer.

[0035] According to another aspect of the present invention, there is provided a terminal for performing uplink transmission and downlink reception in a wireless communication system, the terminal including: 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 an uplink radio signal or reception of a downlink radio signal is valid in a slot including at least one downlink symbol for downlink transmission, a flexible symbol, or an uplink symbol for uplink transmission, and to transmit the uplink radio signal or receive the downlink radio signal according to the determination.

[0036] In one aspect, if the first symbol among the symbols to which the uplink radio signal is assigned in the slot starts a predetermined number of symbols after the downlink symbol or the last symbol among the symbols assigned for receiving the downlink radio signal, the processor transmits the uplink radio signal.

[0037] In another aspect, if a first symbol among the symbols assigned to the uplink radio signal in the slot overlaps with at least one of the downlink symbol, a symbol assigned for receiving the downlink radio signal, or a predetermined number of symbols following the last symbol of the symbols, the processor does not transmit the uplink radio signal.

[0038] 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).

[0039] In yet another aspect, at least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

[0040] In yet another aspect, the downlink radio signal includes 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).

[0041] In yet another aspect, the unused uplink radio signal is a physical uplink control channel, and the processor converts the physical uplink control channel into another type of physical uplink control channel that is valid for transmission in the slot, and transmits the converted physical uplink control channel, or transmits the converted physical uplink control channel in the earliest slot among slots that are valid for transmission after the slot.

[0042] In yet another aspect, if the last symbol among the symbols assigned to the downlink radio signal in the slot ends a predetermined number of symbols before the first symbol among the uplink symbols or symbols assigned for transmission of the uplink radio signal, the processor receives the downlink radio signal.

[0043] In yet another aspect, if the last symbol of the symbols assigned to the downlink radio signal in the slot overlaps with at least one of the uplink symbol, a symbol assigned for transmission of the uplink radio signal, or a predetermined number of symbols prior to the first symbol of the symbols, the processor does not receive the downlink radio signal.

[0044] In yet another aspect, the downlink radio signal includes at least one of a physical downlink shared channel, a physical downlink control channel, or a CSI-RS.

[0045] In yet another aspect, at least one of the symbols to which the downlink radio signal is assigned is a flexible symbol.

[0046] In yet another aspect, the uplink radio signal is a physical random access channel.

[0047] In yet another aspect, the slot is configured by information regarding a slot configuration provided by the base station, and the information regarding the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a terminal-specific RRC message, or dynamic slot format information generated in a physical layer.

[0048] According to yet another aspect of the present invention, there is provided a method for performing uplink transmission and downlink reception by a terminal in a wireless communication system, the method including: determining whether transmission of an uplink radio signal assigned to a terminal or reception of the downlink radio signal is valid in a slot including at least one downlink symbol for downlink transmission, a flexible symbol, and an uplink symbol for uplink transmission; and transmitting the uplink radio signal or receiving the downlink radio signal based on the determination.

[0049] In one aspect, if the first symbol among the symbols to which the uplink radio signal is assigned in the slot starts a predetermined number of symbols after the downlink symbol or the last symbol among the symbols assigned for receiving the downlink radio signal, the uplink radio signal is transmitted.

[0050] On the other hand, in the slot, if the first symbol among the symbols to which the uplink radio signal is assigned overlaps with at least one of the downlink symbol, the symbol assigned for receiving the downlink radio signal, or a predetermined number of symbols after the last symbol of the symbol, the transmission of the uplink radio signal is not performed.

[0051] 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 SRS.

[0052] In still another aspect, at least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

[0053] In still another aspect, the downlink radio signal includes at least one of an SS / PBCH block, a physical downlink shared channel, a physical downlink control channel, or CSI-RS.

[0054] In still another aspect, the non-transmitted uplink radio signal is a physical uplink control channel, and the physical uplink control channel is transmitted after being converted into another type of physical uplink control channel that is effective for transmission in the slot, or is transmitted in the earliest slot among the slots in which transmission is effective after the slot.

[0055] In still another aspect, in the slot, if the last symbol among the symbols to which the downlink radio signal is assigned ends a predetermined number of symbols before the first symbol among the symbols assigned for the transmission of the uplink symbol or the uplink radio signal, the reception of the downlink radio signal is performed.

[0056] In yet another aspect, if the last symbol among the symbols assigned to the downlink radio signal in the slot overlaps with at least one of the uplink symbol, the symbol assigned to transmit the uplink radio signal, or a predetermined number of symbols preceding the first symbol of the symbol, reception of the downlink radio signal is not performed.

[0057] In yet another aspect, the downlink radio signal includes at least one of a physical downlink shared channel, a physical downlink control channel, or a CSI-RS.

[0058] In yet another aspect, at least one of the symbols to which the downlink radio signal is assigned is a flexible symbol.

[0059] In yet another aspect, the uplink radio signal is a physical random access channel.

[0060] In yet another aspect, the slot is configured by information regarding a slot configuration provided by the base station, and the information regarding the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a terminal-specific RRC message, or dynamic slot format information generated in a physical layer. Effect of the Invention

[0061] According to the present invention, even if the slot configuration is changed, the UE can transmit the PUCCH, so that it is possible to prevent PUCCH transmission dropout or unnecessary retransmission of the PUCCH. In addition, by defining effective timing of an uplink signal such as a PRACH, it is possible to increase the frequency efficiency of the network and reduce the energy consumption of the UE.

[0062] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0063] [Figure 1] FIG. 2 is a diagram illustrating an example of a radio frame structure used in a wireless communication system. [Diagram 2] FIG. 1 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Diagram 3] 1 is a diagram illustrating physical channels used in the 3GPP system and a general signal transmission method using the corresponding physical channels. [Figure 4a] A diagram showing SS / PBCH blocks for initial cell access in a 3GPP NR system. [Figure 4b] A diagram showing SS / PBCH blocks for initial cell access in a 3GPP NR system. [Figure 5a] A diagram showing a procedure for control information and control channel transmission in a 3GPP NR system. [Figure 5b] FIG. 1 is a diagram relating to CCE aggregation levels and PDCCH multiplexing. [Figure 6] FIG. 1 is a diagram showing a control resource set (CORESET) in which a physical downlink control channel (PDCCH) is transmitted in a 3GPP NR system. [Figure 7] A diagram showing a method for setting a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 1 is a conceptual diagram illustrating carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining single carrier communication and multi-carrier communication. [Figure 10]A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 11] FIG. 1 is a diagram showing a slot configuration in a TDD-based mobile communication system. [Figure 12a] A diagram showing a PUCCH used in a wireless communication system according to an example. [Figure 12b] A diagram showing a PUCCH used in a wireless communication system according to an example. [Figure 12c] A diagram showing a PUCCH used in a wireless communication system according to an example. [Figure 13] A diagram showing a method of transmitting PUCCH in a slot. [Figure 14a] FIG. 13 is a diagram showing an example in which a PUCCH is transmitted to another slot by changing the slot configuration. [Figure 14b] FIG. 13 is a diagram showing an example in which a PUCCH is transmitted to another slot by changing the slot configuration. [Figure 15a] A diagram showing slots in which a repetitive PUCCH is transmitted according to a slot configuration. [Figure 15b] A diagram showing slots in which a repetitive PUCCH is transmitted according to a slot configuration. [Figure 15c] A diagram showing slots in which a repetitive PUCCH is transmitted according to a slot configuration. [Figure 16a] FIG. 13 is a diagram showing whether PUCCH transmission is possible depending on the slot configuration. [Figure 16b] FIG. 13 is a diagram showing whether PUCCH transmission is possible depending on the slot configuration. [Figure 17] 2A and 2B are block diagrams showing configurations of a terminal and a base station according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0064] The terms used in this specification are selected as common terms currently widely used as much as possible in consideration of the functions in the present invention, but this may vary depending on the intentions, customs, or the emergence of new technologies of the engineers in this field. In addition, in certain cases, the applicant may arbitrarily select some terms, and in this case, the meaning will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be analyzed based on the substantial meaning of the terms and the contents of this specification as a whole, rather than simply the names of the terms.

[0065] Throughout the specification, when a certain component is "connected" to another component, this includes not only "directly connected" but also "electrically connected" through another component in between. Furthermore, when a certain component is "included" in a certain component, this does not mean excluding the other component, but further includes the other component, unless otherwise specified to the contrary. In addition, limitations such as "greater than" or "less than" based on a certain criticality may be appropriately replaced with "greater than" or "less than" depending on the embodiment.

[0066] The following technologies are 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 frequency division multiple access (SC-FDMA), etc. CDMA is implemented in radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA is implemented in radio technologies such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rates for GSM Evolution (EDGE). OFDMA is implemented in radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, Evolved UTRA (E-UTRA), etc. UTRA is a part of the Universal Mobile Telecommunication System (UMTS). 3GPP LTE (Long term evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A, and is a system for supporting eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. For clarity of explanation, the following description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0067] Unless otherwise specified in this specification, the base station may include a next generation node B (gNB) defined in 3GPP NR. Also, unless otherwise specified, the terminal may include a user equipment (UE).

[0068] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a wireless communication system.

[0069] Referring to FIG. 1, a radio frame used in a 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100)*Tc). The radio frame is made up of 10 equally sized subframes (SF). Here, Δfmax=480*103 Hz, Nf=4096, Tc=1 / (Δfref*Nf,ref), Δfref=15*103 Hz, and Nf,ref=2048. The 10 subframes in one frame are numbered from 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots depending on the subcarrier spacing. More specifically, the subcarrier spacing that can be used in a 3GPP NR system is 15*2μkHz. μ is a subcarrier spacing configuration factor, and has a value of μ=0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. A 1 ms long subframe consists of 2μ slots. In this case, the length of each slot is 2-μms. The 2μ slots in one subframe are numbered from 0 to 2μ-1. Also, the slots in one radio frame are numbered from 0 to 10*2μ-1. Time resources are divided by at least one of the radio frame number (also called radio frame index), subframe number (also called subframe index), and slot number (or slot index).

[0070] FIG2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system, and in particular, illustrates a resource grid structure in a 3GPP NR system.

[0071] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol period. Unless otherwise specified, an OFDM symbol is simply referred to as a symbol. Hereinafter, in this specification, a symbol includes an OFDM symbol, an SC-FDMA symbol, a DFTs-OFDM symbol, etc.

[0072] Referring to FIG. 2, a signal transmitted from each slot is expressed as a resource grid consisting of Nsize, μgrid, x*NRBSC subcarriers and Nslotsymb OFDM symbols. Here, x=DL for downlink resource grid and x=UL for uplink resource grid. Nsize, μgrid, and x indicate the number of resource blocks (RBs) according to the subcarrier spacing factor μ (x is DL or UL), and Nslotsymb indicates the number of OFDM symbols in a slot. NRBSC is the number of subcarriers constituting one RB, and NRBSC=12. The OFDM symbol is called a cyclic prefix OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-S-OFDM) symbol according to the multiple access method.

[0073] The number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP). For example, a normal CP includes 14 OFDM symbols in one slot, whereas an extended CP includes 12 OFDM symbols in one slot. In a specific embodiment, the extended CP is used only at a subcarrier interval of 60 kHz. For convenience of explanation, FIG. 2 illustrates a case where one slot includes 14 OFDM symbols, but the embodiment of the present invention is also applicable to slots having other numbers of OFDM symbols in the same manner. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, and x*NRBSC subcarriers in the frequency domain. The types of subcarriers are classified into data subcarriers for transmitting data, reference signal subcarriers for transmitting a reference signal, and guard bands. The carrier frequency is also called a center frequency (fc).

[0074] One RB is defined by NRBSC (e.g., 12) consecutive subcarriers in the frequency domain. Incidentally, a resource consisting of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Thus, one RB consists of Nslotsymb*NRBSC resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) in one slot. k is an index ranging from 0 to Nsize,μgrid,x*NRBSC-1 in the frequency domain, and l is an index ranging from 0 to Nslotsymb-1 in the time domain.

[0075] In order for a terminal to receive a signal from a base station or transmit a base station signal, the time / frequency synchronization of the terminal should be aligned with the time / frequency synchronization of the base station, because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters required to demodulate DL signals and transmit UL signals at the correct time.

[0076] Each symbol of a radio frame operating in time division duplex (TDD) or unpaired spectrum consists of at least one of downlink symbol (DL symbol), uplink symbol (UL symbol) or flexible symbol. A radio frame operating in frequency division duplex (FDD) or paired spectrum with a downlink carrier consists of downlink symbols or flexible symbols, and a radio frame operating with an uplink carrier consists of uplink symbols or flexible symbols. A downlink symbol allows downlink transmission but not uplink transmission, and an uplink symbol allows uplink transmission but not downlink transmission. Whether a flexible symbol is used in the downlink or uplink is determined depending on the signal.

[0077] Information on the type of each symbol, i.e., information indicating any one of the downlink symbol, the uplink symbol, and the flexible symbol, is composed of a cell-specific (cell-specific or common) RRC signal. In addition, the information on the type of each symbol is additionally composed of a UE-specific (UE-specific or dedicated) RRC signal. The base station uses the cell-specific RRC signal to inform i) the period of the cell-specific slot configuration, ii) the number of slots having only downlink symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of downlink symbols from the first symbol of the slot immediately following the slot having only downlink symbols, iv) the number of slots having only uplink symbols from the end of the period of the cell-specific slot configuration, and v) the number of uplink symbols from the last symbol of the slot immediately preceding the slot having only uplink symbols. Here, a symbol that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0078] If the information regarding the symbol type consists of the UE-specific RRC signal, the base station signals whether the flexible symbol is a downlink symbol or an uplink symbol using the cell-specific RRC signal. At this time, the UE-specific RRC signal cannot change the downlink symbol or uplink symbol consisting of the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of downlink symbols among the Nslotsymb symbols of the corresponding slot and the number of uplink symbols among the Nslotsymb symbols of the corresponding slot for each slot. At this time, the downlink symbols of the slot are continuously configured from the first symbol to the i-th symbol of the slot. Also, the uplink symbols of the slot are continuously configured from the j-th symbol to the last symbol of the slot (where i < j). In a slot, a symbol that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0079] The type of symbol consisting of the RRC signal as described above is referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration consisting of the RRC signal described above, the flexible symbol is indicated as a downlink symbol, an uplink symbol, or a flexible symbol via the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, the downlink symbol or uplink symbol consisting of the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI indicated by the base station to the UE.

[0080]

Table 1

[0081] In Table 1, D indicates a downlink symbol, U indicates an uplink symbol, and X indicates a flexible symbol. As shown in Table 1, up to two DL / UL switchings are allowed in one slot.

[0082] FIG. 3 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channels.

[0083] When a terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation S101. More specifically, the terminal synchronizes with a base station in the initial cell search. To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Next, the terminal receives a physical broadcast channel from the base station to acquire broadcast information within the cell.

[0084] After completing the initial cell search, the terminal receives a physical downlink shared channel (PDSCH) via a physical downlink control channel (PDCCH) and information carried on the PDCCH, thereby acquiring more detailed system information than the system information acquired through the initial cell search (S102).

[0085] If the terminal first accesses the base station or if there are no radio resources for signal transmission, the terminal performs a random access procedure to the base station (S103 to S106). First, the terminal transmits a preamble via a physical random access channel (PRACH) (S103) and receives a response message to the preamble from the base station via a PDCCH and a corresponding PDSCH (S104). If the terminal receives a valid random access response message, the terminal transmits data including its own identifier, etc. to the base station via a physical uplink shared channel (PUSCH) indicated from an uplink grant transmitted from the base station via the PDCCH (S105). Next, the terminal waits to receive a PDCCH as an instruction from the base station to resolve collisions. If the terminal successfully receives the PDCCH via its own identifier (S106), the random access procedure is terminated.

[0086] After the above-mentioned procedure, the terminal receives PDCCH / PDSCH S107 and transmits physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) S108 as a general uplink / downlink signal transmission procedure. In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. The format of the DCI may differ depending on the purpose of use. The uplink control information (UCI) transmitted by the terminal to the base station via the uplink includes downlink / uplink ACK / NACK signals, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI are included in channel state information (CSI). In the case of a 3GPP NR system, the terminal transmits control information such as the above-mentioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0087] FIG. 4 is a diagram illustrating SS / PBCH blocks for initial cell access in a 3GPP NR system.

[0088] When a terminal is powered on or attempts to access a new cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. The terminal detects the physical cell identity (NcellID) of the cell during the cell search process. To this end, the terminal receives synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station to synchronize with the base station. At this time, the terminal acquires information such as a cell identity (ID).

[0089] With reference to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into PSS and SSS. The PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization and slot synchronization. The SSS is used to obtain frame synchronization and cell group ID. With reference to FIG. 4(a) and Table 2, the SS / PBCH block consists of 20 consecutive RBs (=240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol and the SSS is transmitted in the third OFDM symbol via the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals via 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 via subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) via the remaining REs in the SS / PBCH block excluding the above-mentioned signals.

[0090] [Table 2]

[0091] The SS groups a total of 1008 unique physical layer cell IDs through the combination of three PSSs and SSSs, more specifically, into 336 physical layer cell ID groups, each group including three unique identifiers, such that each physical layer cell ID is part of only one physical layer cell ID group. Thus, a physical layer cell ID NcellID=3N(1)ID+N(2)ID is uniquely defined by an index N(1)ID ranging from 0 to 335 indicating a physical layer cell ID group and an index N(2)ID ranging from 0 to 2 indicating a physical layer identifier in the physical layer cell ID group. The terminal detects the PSS and identifies one of the three unique physical layer identifiers. The terminal also detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS is PSS (n) is as shown in the following formula 1.

[0092]

number

[0093]

number

number

[0094]

number

[0095]

number

number

[0096] A radio frame with a length of 10 ms is divided into two half frames with a length of 5 ms. The slots in each half frame in which the SS / PBCH block is transmitted will be described with reference to FIG. 4(b). The slots in which the SS / PBCH block is transmitted are any one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*nth symbol. In this case, n=0, 1 for carrier frequencies below 3 GHz. Also, n=0, 1, 2, 3 for carrier frequencies above 3 GHz and below 6 GHz. In case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*nth symbol. In this case, n=0 for carrier frequencies below 3 GHz. Also, n=0, 1 for carrier frequencies above 3 GHz and below 6 GHz. In case C, the subcarrier spacing is 30 kHz and the start of the SS / PBCH block is {2, 8}+14*n symbols, where n=0, 1 for carrier frequencies below 3 GHz. Also, n=0, 1, 2, 3 for carrier frequencies above 3 GHz and below 6 GHz. In case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is {4, 8, 16, 20}+28*n symbols, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz. In case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n symbols. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies of 6 GHz or higher.

[0097] Figure 5 is a diagram showing a procedure for transmitting control information and a control channel in a 3GPP NR system. Referring to Figure 5(a), a base station adds a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., DCI) S202. The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more terminals includes 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). Also, the UE-specific RNTI includes at least one of C-RNTI (cell temporary RNTI), CS-RNTI, or MCS-C-RNTI. Next, the base station performs channel encoding (e.g., polar coding) S204, and then performs rate-matching according to the amount of resource(s) used for PDCCH transmission S206. Next, the base station multiplexes DCI(s) based on a PDCCH structure based on a control channel element (CCE) S208. In addition, the base station applies additional processes such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI(s) S210, and maps them to resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE consists of a plurality of (e.g., 6) resource element groups (REGs). One REG consists of a plurality of (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as an aggregation level. 3GPP NR systems use aggregation levels of 1, 2, 4, 8, or 16.FIG. 5(b) is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region accordingly.

[0098] FIG. 6 is a diagram showing a CORESET in which a PDCCH is transmitted in a 3GPP NR system.

[0099] A CORESET is a time-frequency resource in which a PDCCH, which is a control signal for a terminal, is transmitted. A search space, which will be described later, is mapped to one CORESET. Thus, a terminal does not monitor all frequency bands to receive a PDCCH, but monitors a time-frequency region designated as a CORESET and decodes a PDCCH mapped to the CORESET. A base station configures one or more CORESETs for a terminal for each cell. A CORESET is made up of up to three consecutive symbols on the time axis. Also, a CORESET is made up of six units of consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 is made up of consecutive PRBs, and CORESET#2 and CORESET#3 are made up of discontinuous PRBs. A CORESET may be located at any symbol in a slot. For example, in the embodiment of FIG. 5, CORESET#1 starts from the first symbol of a slot, CORESET#2 starts from the fifth symbol of a slot, and CORESET#9 starts from the ninth symbol of a slot.

[0100] FIG. 7 is a diagram illustrating a method for setting a PDCCH search space in a 3GPP NR system.

[0101] In order to transmit a PDCCH to a terminal, at least one search space exists in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) in which the PDCCH of the terminal is transmitted. The search space includes a common search space that 3GPP NR terminals should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in a cell belonging to the same base station monitor a PDCCH that is set to be commonly searched. In addition, the terminal-specific search space is set for each terminal so that the PDCCH allocated to each terminal is monitored at a different search space position according to the terminal. In the case of the terminal-specific search space, the search spaces between terminals may be partially overlapped due to the limited control region to which the PDCCH is allocated. Monitoring the PDCCH includes blind decoding the PDCCH candidates in the search space. If blind decoding is successful, it is expressed as the PDCCH being (successfully) detected / received, and if blind decoding is unsuccessful, it is expressed as the PDCCH being undetected / not received or not successfully detected / received.

[0102] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals to transmit downlink control information to one or more terminals is referred to as a group common (GC) PDCCH or a common PDCCH. Also, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal to transmit uplink scheduling information or downlink scheduling information to one specific terminal is referred to as a terminal-specific PDCCH. The common PDCCH is included in a common search space, and the terminal-specific PDCCH is included in a common search space or a terminal-specific PDCCH.

[0103] The base station notifies each terminal or terminal group of information on resource allocation of transmission channels PCH (paging channel) and DL-SCH (downlink-shared channel) (i.e., DL Grant) or information on UL-SCH resource allocation and hybrid automatic repeat request (HARQ) (i.e., UL Grant) via the PDCCH. The base station transmits PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. In addition, the terminal receives data excluding specific control information or specific service data via the PDSCH.

[0104] The base station transmits information on which terminal (one or more terminals) the PDSCH data is transmitted to and how the corresponding terminal should receive and decode the PDSCH data by including it in the PDCCH. For example, assume that the DCI transmitted through a specific PDCCH is CRC masked with RNTI "A", the DCI indicates that the PDSCH is allocated to radio resource "B" (e.g., frequency position) and indicates transmission format information "C" (e.g., transmission block size, modulation method, coding information, etc.). The terminal monitors the PDCCH using its own RNTI information. In this case, if there is a terminal that blindly decodes the PDCCH using RNTI "A", the corresponding terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0105] Table 3 shows one embodiment of a PUCCH used in a wireless communication system.

[0106] [Table 3]

[0107] The PUCCH is used to transmit the following uplink control information (UCI):

[0108] -SR (Scheduling Request): Information used to request uplink UL-SCH resources.

[0109] -HARQ-ACK: a response to a PDCCH (indicating DL SPS release) and / or a response to an uplink transport block (TB) on a PDSCH. HARQ-ACK indicates whether information transmitted via a PDCCH or a PDSCH has been received. HARQ-ACK responses include a positive ACK (simply, ACK), a negative ACK (hereinafter, NACK), a discontinuous transmission (DTX), or a NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, an ACK is represented by a bit value of 1, and a NACK is represented by a bit value of 0.

[0110] -CSI: Feedback information for a downlink channel. It is generated by a terminal based on a CSI-RS (Reference Signal) transmitted by a base station. MIMO (multiple input multiple output)-related feedback information includes RI and PMI. CSI is divided into CSI part 1 and CSI part 2 according to the information indicated by CSI.

[0111] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios and various channel environments and frame structures.

[0112] PUCCH format 0 is a format that carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted through one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted through two OFDM symbols, the same sequence is transmitted in two symbols in different RBs. Through this, the terminal obtains frequency diversity gain. More specifically, the terminal bit Bit UCI(M bit =1 or 2), the cyclic shift value m cs Determine the base sequence of length 12 and divide it by the determined value m cs The sequence cyclically shifted by M is mapped to 12 REs of one OFDM symbol and one PRB and transmitted. The number of cyclic shifts available to the terminal is 12, and M bit If =1, then 1-bit UCI0 and 1 are represented by a sequence of two cyclic shifts whose difference in cyclic shift value is 6. Also, M bit = 2, then the 2-bit UCI 00, 01, 11, 10 is represented by a sequence of four cyclic shifts with a cyclic shift value difference of 3.

[0113] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is 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 is one of 4 to 14. More specifically, UCI with Mbit=1 is modulated by BPSK. The terminal modulates UCI with Mbit=2 by quadrature phase shift keying (QPSK). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. The terminal transmits the obtained signal by spreading it by a time-axis orthogonal cover code (OCC) on even-numbered OFDM symbols to which PUCCH format 1 is assigned. In PUCCH format 1, the maximum number of different terminals multiplexed in the same RB can be determined according to the length of the OCC used. In odd-numbered OFDM symbols of PUCCH format 1, a demodulation reference signal (DMRS) is spread by OCC and mapped.

[0114] PUCCH format 2 transmits UCI exceeding 2 bits. PUCCH format 2 is transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted through two OFDM symbols, the same sequence is transmitted through two OFDM symbols in different RBs. Through this, the terminal obtains frequency diversity gain. More specifically, Mbit UCI (Mbit>2) is bit-level scrambled and QPSK modulated to be mapped to RBs of one or two OFDM symbols. Here, the number of RBs is one of 1 to 16.

[0115] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is 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 is one of 4 to 14. In particular, the terminal modulates Mbit UCI (Mbit>2) with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(Msymb-1). Here, Msymb=Mbit when π / 2-BPSK is used, and Msymb=Mbit / 2 when QPSK is used. The terminal does not apply block-wise spreading to PUCCH format 3. However, the terminal may apply block-wise spreading to one RB (i.e., 12 subcarriers) using PreDFT-OCC of length -12 so that PUCCH format 4 has a multiplexing capacity of 2 or 4. The terminal transmits the spread signal by transmit precoding (or DFT-precoding) and mapping it to each RE.

[0116] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via PUCCH. If the number of RBs that the terminal can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the terminal does not transmit some UCI information according to the priority of the UCI information and transmits only the remaining UCI information.

[0117] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped is configured via RRC signaling. If PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor(N / 2) OFDM symbols and the second hop has ceil(N / 2) OFDM symbols.

[0118] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted is configured by an RRC signal. The repeatedly transmitted PUCCH should start from the same OFDM symbol position in each slot and have the same length. If the RRC signal indicates that any one of the OFDM symbols in the slot in which the UE should transmit the PUCCH is a DL symbol, the UE does not transmit the PUCCH from the corresponding slot, but postpones it to the next slot for transmission.

[0119] Meanwhile, in a 3GPP NR system, a terminal transmits and receives using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal is configured with a BWP (bandwidth part) consisting of a continuous bandwidth that is a part of the carrier bandwidth. A terminal operating according to TDD or in an unpaired spectrum is configured with up to four DL / UL BWP pairs for one carrier (or cell). The terminal also activates one DL / UL BWP pair. A terminal operating according to FDD or in a paired spectrum is configured with up to four DL BWPs for a downlink carrier (or cell) and up to four UL BWPs for an uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal may not receive or transmit from time-frequency resources other than the activated BWP. The activated BWP is called an active BWP.

[0120] The base station refers to an activated BWP among the BWPs configured for the terminal as a DCI. The BWP indicated by the DCI is activated, and the other configured BWP(s) are deactivated. In a carrier (or cell) operating in TDD, the base station includes a BPI (bandwidth part indicator) indicating the activated BWP in the DCI for scheduling the PDSCH or PUSCH to change the DL / UL BWP pair of the terminal. The terminal receives the DCI for scheduling the PDSCH or PUSCH and identifies the activated DL / UL BWP pair based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI for scheduling the PDSCH to change the DL BWP of the terminal. In the case of an uplink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI for scheduling the PDSCH to change the UL BWP of the terminal.

[0121] Figure 8 is a conceptual diagram explaining carrier aggregation. Carrier aggregation refers to a method in which a terminal uses a plurality of frequency blocks or (logical) cells consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers) in one large logical frequency band in order for a wireless communication system to use a wider frequency band. In the following, for convenience of explanation, the term "component carrier" is used.

[0122] Referring to FIG. 8, as an example of a 3GPP NR system, the entire system band includes up to 16 component carriers, and each component carrier has a bandwidth of up to 400 MHz. The component carrier includes one or more physically contiguous subcarriers. Although each component carrier is shown to have the same bandwidth in FIG. 8, this is merely an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown to be adjacent to each other on the frequency axis, the drawing is a logical concept, and each component carrier may be physically adjacent to each other or separated from each other.

[0123] A different center frequency is used in each component carrier. Also, a common center frequency is used in physically adjacent component carriers. In the embodiment of FIG. 8, if it is assumed that all component carriers are physically adjacent, center frequency A is used in all component carriers. Also, if it is assumed that each component carrier is not physically adjacent, center frequency A and center frequency B are used in each component carrier.

[0124] When the entire system band is expanded by carrier aggregation, the frequency band used for communication with each terminal is defined in component carrier units. Terminal A uses the entire system band of 100 MHz and communicates using all five component carriers. Terminals B1 to B5 use only a 20 MHz bandwidth and communicate using one component carrier. Terminals C1 and C2 use only a 40 MHz bandwidth and communicate using two component carriers each. The two component carriers may be logically / physically adjacent or not adjacent. The embodiment of FIG. 8 shows a case where terminal C1 uses two non-adjacent component carriers and terminal C2 uses two adjacent component carriers.

[0125] 9 is a diagram for explaining terminal carrier communication and multi-carrier communication. In particular, FIG. 9(a) shows a subframe structure of a single carrier, and FIG. 9(b) shows a subframe structure of a multi-carrier.

[0126] Referring to FIG. 9(a), a general wireless communication system transmits or receives data through one DL band and one corresponding UL band in the FDD mode. In another specific embodiment, in the TDD mode, the wireless communication system divides a wireless frame into an uplink time unit and a downlink time unit in the time domain, and transmits or receives data through the uplink / downlink time unit. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) are aggregated in the UL and DL, respectively, to support a bandwidth of 60 MHz. The CCs are adjacent or non-adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case in which the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical for convenience, the bandwidth of each CC may be determined independently. Also, asymmetric carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible. The DL / UL CC allocated / configured to a specific terminal through RRC is called a serving DL / UL CC of the specific terminal.

[0127] The base station activates some or all of the serving CCs of the terminal, or deactivates some of the CCs to communicate with the terminal. The base station may change the CCs to be activated / deactivated, or may change the number of CCs to be activated / deactivated. When the base station allocates CCs available to the terminal in a cell-specific or terminal-specific manner, at least one of the CCs once allocated may not be deactivated unless the CC allocation for the terminal is completely reconfigured or the terminal is handed over. A CC that is not deactivated by the terminal is called a primary CC (PCC) or PCell (primary cell), and a CC that the base station can activate / deactivate freely is called a secondary CC (SCC) or SCell (secondary cell).

[0128] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink and uplink resources, i.e., a combination of DL CC and UL CC. A cell consists of DL resources alone or a combination of DL and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CC) and the carrier frequency of UL resources (or UL CC) is indicated by system information. Carrier frequency means the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to a SCC is called a SCell. A carrier corresponding to a PCell in the downlink is a DL PCC, and a carrier corresponding to a PCell in the uplink is a UL PCC. Similarly, a carrier corresponding to a SCell in the downlink is a DL SCC, and a carrier corresponding to a SCell in the uplink is a UL SCC. Depending on the terminal capacity, a serving cell(s) consists of one PCell and zero or more SCells. For a UE in RRC_CONNECTED state but with no carrier aggregation configured or that does not support carrier aggregation, there is only one serving cell consisting of only a PCell.

[0129] As described above, the term cell used in carrier aggregation is different from the term cell referring to a certain geographical area to which communication services are provided by one base station or one antenna group. However, in order to distinguish between a cell referring to a certain geographical area and a cell of carrier aggregation, in the present invention, a cell of carrier aggregation is referred to as CC, and a cell of a geographical area is referred to as cell.

[0130] FIG. 10 is a diagram showing an example in which a cross-carrier scheduling technique is applied. If cross-carrier scheduling is configured, a control channel transmitted through a first CC schedules a data channel transmitted through a first CC or a second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted from a PDCCH region of the scheduling cell schedules a PDSCH / PUSCH of a scheduled cell. That is, a search region for a plurality of component carriers is the PDCCH region of the scheduling cell. A PCell is basically a scheduling cell, and a specific SCell is designated as a scheduling cell by a higher layer.

[0131] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCC (or SCell). It is also assumed that DL PCC is configured as PDCCH monitoring CC. If cross-carrier scheduling is not configured by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, CIF is disabled, and each DL CC transmits only PDCCH that schedules its own PDSCH without CIF according to NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, if cross-carrier scheduling is configured by UE-specific (or UE-group-specific, or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., DL PCC) transmits not only a PDCCH for scheduling the PDSCH of DL CC A but also a PDCCH for scheduling the PDSCH of other CCs using the CIF (cross-carrier scheduling). On the other hand, no PDCCH is transmitted in other DL CCs. Thus, depending on whether cross-carrier scheduling is configured in the terminal, the terminal monitors a PDCCH that does not include a CIF to receive a self-carrier scheduled PDSCH, or monitors a PDCCH that includes a CIF to receive a cross-carrier scheduled PDSCH.

[0132] 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, the same or similar structure can be applied to the 3GPP NR system, however, in the 3GPP NR system, the subframes in FIG. 9 and 10 are switched to slots.

[0133] In the present invention, the number of symbols contained in one slot is 14 for cells consisting of a normal cyclic prefix (CP) and 12 for cells consisting of an extended CP, but for convenience of explanation, we will assume that there are seven symbols.

[0134] FIG. 11 is a diagram showing a slot configuration in a TDD-based mobile communication system.

[0135] Referring to FIG. 11, four slot configurations are defined, such as a slot including only DL symbols (DL-only), a slot mainly including DL symbols (DL-centric), a slot mainly including UL symbols (UL-centric), and a slot including only UL symbols (UL-only).

[0136] One slot includes seven symbols. A gap (GP) exists when changing from downlink to uplink or when changing from uplink to downlink. That is, a gap is inserted between downlink and uplink or between uplink and downlink. One symbol is used to transmit downlink control information. Hereinafter, the symbol that constitutes the gap is referred to as a gap symbol.

[0137] A slot including only DL symbols (DL-only) literally includes only DL symbols. For example, a slot including only DL symbols includes seven DL symbols, as in DL-only in FIG.

[0138] A DL-centric slot includes multiple DL symbols, at least one gap symbol, and at least one UL symbol. For example, a DL-centric slot includes five DL symbols, one gap symbol, and one UL symbol, in sequence, as in the DL-centric slot of FIG. 11.

[0139] A UL-centric slot includes at least one DL symbol, at least one gap symbol, and multiple UL symbols. For example, a UL-centric slot includes one DL symbol, one gap symbol, and five UL symbols, in sequence, as in the UL-centric of FIG. 11.

[0140] A slot including only UL symbols (UL-only) literally includes only UL symbols. For example, a slot including only UL symbols includes seven UL symbols, as shown in UL-only in FIG.

[0141] The network informs the terminal of the default slot configuration, and RRC signaling is used for this purpose. Information on the default slot configuration set through RRC signaling is referred to as semi-static DL / UL allocation information. The default slot configuration is a slot configuration that the terminal may assume the network will use unless the base station transmits separate signaling for changing the slot configuration to the terminal. The 3GPP NR system supports dynamic TDD, which changes the slot configuration according to various traffic conditions of the terminal. To this end, the base station informs the terminal of the slot configuration of the current or future slots every slot, or every few slots, or every time the base station changes the slot configuration. To inform the terminal of the slot configuration, the NR system uses two methods.

[0142] The first method is a method of using a group common PDCCH. The group common PDCCH is a PDCCH broadcast to multiple terminals, and is transmitted every slot, every few slots, or only when necessary by the base station. The group common PDCCH includes a (Dynamic) Slot Format Information Indicator (SFI) to transmit information about the slot configuration, and the slot format information indicator indicates the current slot configuration in which the group common PDCCH is transmitted, or several future slot configurations including the current slot configuration. If the terminal receives the group common PDCCH, it knows the current slot configuration or the future slot configuration including the current slot configuration through the slot configuration information indicator included in the group common PDCCH. If the terminal fails to receive the group common PDCCH, it cannot determine whether the base station has transmitted the group common PDCCH.

[0143] The second method is a method of transmitting information about a slot configuration in a UE-specific PDCCH that schedules a PDSCH or a PUSCH. The UE-specific PDCCH is transmitted by unicast only to a specific user who needs to be scheduled. The UE-specific PDCCH transmits the same slot format information indicator as that transmitted in the group common PDCCH as slot configuration information of the scheduled slot. Alternatively, the UE-specific PDCCH includes information that can infer the configuration of the scheduled slot. As an example, the UE receives the UE-specific PDCCH that is assigned to it, thereby learning the slot to which the PDSCH or PUSCH is assigned and the position of the OFDM symbol in the slot, and then infers the configuration of the corresponding slot. Also, the UE-specific PDCCH that schedules the PDSCH indicates the slot in which the PUCCH including the HARQ-ACK feedback information is transmitted and the position of the OFDM symbol in the slot, and then infers the configuration of the slot in which the PUCCH is transmitted.

[0144] Hereinafter, a downlink signal used in the present invention is a radio signal transmitted from a base station to a terminal, and includes a physical downlink channel, a sequence, a reference signal (DM-RS, CSI-RS, TRS, PT-RS, etc.) generated and processed in a physical layer, and a MAC message and an RRC message (or RRC signaling) generated and processed in a MAC layer and an RRC layer, respectively. The MAC message and the RRC message may be called a higher layer signaling to distinguish them from signals of a physical layer constituting a lower layer of OSI. Here, the downlink physical channel further includes a downlink physical shared channel (PDSCH), a downlink physical control channel (PDCCH), and a physical broadcast channel (PBCH).

[0145] In addition, an uplink signal used in the present invention is a radio signal transmitted from a terminal to a base station, and includes a physical uplink channel, a sequence, a reference signal (SRS, etc.) generated and processed in a physical layer, and a MAC message and an RRC message (or RRC signaling) generated and processed in a MAC layer and an RRC layer, respectively. Here, the uplink physical channel further includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH).

[0146] FIG. 12 is a diagram illustrating a PUCCH used in a wireless communication system according to an example.

[0147] Referring to FIG. 12, the 3GPP NR system uses two types of PUCCH depending on the size of the time resource (i.e., the number of symbols) used for transmitting the PUCCH.

[0148] The first type PUCCH is called a Long PUCCH and is transmitted by being mapped to four or more consecutive symbols of a slot. The first type PUCCH is mainly used to transmit a large amount of UCI (uplink control information) or is assigned to a user having low signal strength to increase PUCCH coverage. The first type PUCCH is repeatedly transmitted in a plurality of slots to increase the PUCCH coverage. The first type PUCCH includes PUCCH format 1 for transmitting 1 or 2-bit UCI, PUCCH format 3 for transmitting UCI exceeding 2 bits and not supporting multiplexing between users, and PUCCH format 4 for transmitting UCI exceeding 2 bits and supporting multiplexing between users.

[0149] The second type PUCCH is called a Short PUCCH, and is mapped to one or two symbols of a slot and transmitted, and is used to transmit a small amount of UCI or is assigned to a user with high signal strength and is used to support a service that requires low latency. The second type PUCCH includes PUCCH format 0 that transmits 1 or 2 bits of UCI and PUCCH format 2 that transmits UCI exceeding 2 bits.

[0150] In one slot, there are time-frequency resources usable as a first type PUCCH and time-frequency resources usable as a second type PUCCH, which are assigned to different terminals or assigned to one terminal. When assigned to one terminal, the first type PUCCH and the second type PUCCH are transmitted in different time resources (i.e., different OFDM symbols). That is, when assigned to one terminal, the first type PUCCH and the second type PUCCH are transmitted after being Time Division Multiplexed (TDM).

[0151] The UCI mapped to the PUCCH includes SR (Scheduling grant), HARQ-ACK, RI, CSI, and BI (Beam-related Information). SR is information that the terminal informs the base station that there is uplink transmission. HARQ-ACK is information that informs whether the PDSCH transmitted by the base station has been successfully received. RI is information that informs the rank that can be transmitted on a wireless channel when multiple antennas are used. CSI is information that informs the terminal of a value measured by the terminal as the channel condition between the base station and the terminal. BI is information that informs information regarding beamforming of the transmitting end and the receiving end.

[0152] Referring to Figure 12 (a), the DL-centric slot shown in the figure is composed of five DL symbols, one flexible symbol, and one UL symbol. The DL-centric slot is assigned a second type PUCCH with a length of one symbol. The second type PUCCH is located at the last symbol of the slot.

[0153] Referring to Figure 12 (b), the illustrated UL-centric slot is configured and indicated by one DL symbol, one flexible symbol, and five UL symbols. The UL-centric slot is assigned a first type PUCCH and / or a second type PUCCH. The first type PUCCH is mapped to four symbols, and the second type PUCCH is mapped to the last symbol of the slot.

[0154] 12(c), a slot in which only UL symbols exist (UL only) is assigned a first type PUCCH and / or a second type PUCCH, for example, the first type PUCCH is mapped to six symbols, and the second type PUCCH is mapped to the last symbol of the slot.

[0155] 11 and 12, the slot configurations capable of transmitting the second type PUCCH are a slot mainly composed of DL symbols, a slot mainly composed of UL symbols, and a slot including only UL symbols, and the slot configurations capable of transmitting the first type PUCCH are a slot mainly composed of UL symbols and a slot including only UL symbols. In addition, the slots capable of transmitting the first type PUCCH and the second type PUCCH by TDM are a slot mainly composed of UL symbols and a slot including only UL symbols. Incidentally, the slot mainly composed of DL symbols has one symbol allocated in the uplink, so the second type PUCCH can be transmitted, but the first type PUCCH cannot be transmitted. Therefore, the PDCCH that schedules the PUCCH allocates the first type PUCCH to a slot mainly composed of UL symbols or a slot including only UL symbols. In addition, the PDCCH that schedules the PUCCH allocates the second type PUCCH to a slot mainly composed of DL symbols, a slot mainly composed of UL symbols, or a slot including only UL symbols.

[0156] As described above, the base station (or network) changes the slot configuration according to the traffic of the terminal and various conditions, and notifies the terminal of the change in the slot configuration. Since the slot configuration is changed in this way, the terminal should receive a slot configuration information indicator or information on the slot configuration by monitoring the group common PDCCH and the terminal specific PDCCH. However, due to problems such as the wireless channel condition and interference between the base station and the terminal, the terminal may fail to receive the group common PDCCH and the terminal specific PDCCH.

[0157] If the terminal fails to receive the group common PDCCH and / or terminal specific PDCCH, the terminal cannot know whether the base station has changed the slot configuration. However, if the base station has changed the slot configuration and the PUCCH transmission scheduled by the terminal does not match the changed slot configuration, if the terminal forces the PUCCH transmission as scheduled, the PUCCH transmission may fail, causing problems such as temporary communication interruption or delay. Therefore, in this case, a clear procedure or a prior protocol between the terminal and the base station is required for the terminal to transmit or abandon the instructed PUCCH, and if it does transmit, how to transmit it.

[0158] An embodiment for this purpose defines an operation method of a terminal and a base station for resolving a case where a terminal fails to receive a group common PDCCH and / or a terminal specific PDCCH including a slot configuration information indicator and slot configuration related information.

[0159] Another embodiment defines a terminal that processes the transmission of a PUCCH and its operating method, and a base station that processes the reception of the assigned PUCCH and its operating method, when a terminal successfully receives a group common PDCCH and / or a terminal specific PDCCH including a slot configuration information indicator and slot configuration related information, but is unable to transmit the assigned PUCCH due to a change in the configuration of a slot to which a PUCCH is assigned (or for which PUCCH transmission is scheduled).

[0160] [Example] First, a method of operating a terminal and a base station according to the present embodiment will be disclosed. In this embodiment, a certain constraint is placed on the slot configuration change of the base station to realize a predictable communication state between the terminal and the base station. In this case, the PUCCH transmission of the terminal is performed regardless of whether the terminal receives the group common PDCCH and the terminal specific PDCCH successfully or unsuccessfully.

[0161] Example: The slot configuration of the slot including the symbol to which the PUCCH is assigned (or transmitted) is maintained the same without changing it.

[0162] This embodiment can be further divided into detailed examples according to whether the allocated (or transmitted) PUCCH is a first type PUCCH or a second type PUCCH. As an example, the slot configuration of the symbol to which the first type PUCCH is assigned (or transmitted) is maintained the same without being changed. That is, the base station does not change the slot configuration of the OFDM symbol to which the first type PUCCH is assigned, and the terminal assumes (or promises, expects) that the slot configuration of the OFDM symbol to which the first type PUCCH is assigned will not be changed. Thus, the terminal transmits the first type PUCCH regardless of receiving the slot configuration information indicator and slot configuration related information transmitted in the group common PDCCH and the terminal specific PDCCH.

[0163] As another example, the slot configuration of the symbol to which the second type PUCCH is assigned (or transmitted) is maintained the same without being changed. That is, the base station does not change the slot configuration of the symbol to which the second type PUCCH is assigned (or transmitted), and the terminal also assumes (or promises, expects) that the slot configuration of the symbol to which the second type PUCCH is assigned (or transmitted) is not changed. Thus, the terminal transmits the second type PUCCH regardless of receiving the slot configuration information indicator and slot configuration related information transmitted in the group common PDCCH and the terminal specific PDCCH.

[0164] As described above, the embodiment in which the slot configuration of the base station is prohibited from being changed may be a constraint on flexible scheduling. In order to complement this aspect, the following discloses an embodiment of another aspect in which the slot configuration of the base station is allowed to be changed within a certain range.

[0165] The slot configuration of the symbol to which the PUCCH is assigned (or transmitted) can only be changed within a certain range.

[0166] Even if the slot configuration of the symbol to which the PUCCH is assigned (or transmitted) is changed, the slot configuration is changed to one in which the PUCCH can be transmitted, and is not changed to one in which the PUCCH cannot be transmitted. Thus, the terminal does not expect a change to a slot in which the PUCCH is instructed to be transmitted by the base station to one in which the PUCCH cannot be transmitted. The embodiment according to this aspect is further divided into detailed embodiments according to whether the assigned (or transmitted) PUCCH is a first type PUCCH or a second type PUCCH.

[0167] For example, even if the base station changes the slot configuration of the symbol to which the first type PUCCH is assigned, the base station can change it to a slot configuration that allows transmission of the first type PUCCH, but cannot change it to a slot configuration that does not allow transmission of the first type PUCCH. Therefore, the terminal does not expect the slot instructed by the base station to transmit the first type PUCCH to a slot that does not allow transmission of the first type PUCCH. Even if the terminal fails to receive the group common PDCCH including the slot configuration information indicator of the slot to transmit the first type PUCCH, the terminal always transmits the first type PUCCH using the assigned resources.

[0168] For example, referring to Fig. 12, the base station can change a slot mainly consisting of UL symbols to which a first type PUCCH having a length of 4 OFDM symbols is assigned to a slot including only UL symbols, but cannot change it to a slot including only DL symbols having one UL symbol or a slot mainly consisting of DL symbols. Meanwhile, the terminal expects a slot mainly consisting of UL symbols to which a first type PUCCH having a length of 4 OFDM symbols is assigned for transmission from the base station to be changed to a slot including only UL symbols, but does not expect the change to a slot including only DL symbols or a slot mainly consisting of DL symbols. In addition, the terminal does not expect a change in the slot configuration in which UL symbol(s) instructed by the base station to transmit the first type PUCCH is changed to DL symbol(s).

[0169] As another example, even if the base station changes the slot configuration of the symbol to which the second type PUCCH is assigned, it can change it to a slot configuration that allows the transmission of the second type PUCCH, but cannot change it to a slot configuration that does not allow the transmission of the second type PUCCH. Therefore, the terminal does not expect the base station to change the slot instructed to transmit the second type PUCCH from the base station to a slot that does not allow the transmission of the second type PUCCH. Even if the terminal fails to receive the group common PDCCH including the slot configuration information indicator of the slot to transmit the second type PUCCH, the terminal always transmits the second type PUCCH with the assigned resource. More specifically, the base station can change the slot mainly consisting of UL symbols to which the second type PUCCH is assigned to a slot mainly consisting of DL symbols that allows the transmission of the second type PUCCH or a slot including only UL symbols, but cannot change it to a slot including only DL symbols that does not allow the transmission of the second type PUCCH. And the terminal also does not expect the base station to change the slot instructed to transmit the second type PUCCH to a slot that does not allow the transmission of the second type PUCCH.

[0170] For example, the terminal expects (or predicts) that a slot mainly consisting of UL symbols to which a second type PUCCH of 1 or 2 symbols length instructed for transmission by a base station is assigned can be changed to a slot mainly consisting of DL symbols including the second type PUCCH or a slot including only UL symbols, but does not expect (or predict) that the slot will be changed to a slot including only DL symbols that cannot include the second type PUCCH.Furthermore, the terminal does not expect a change in the slot configuration in which the UL symbol(s) instructed by the base station to transmit the second type PUCCH is changed to DL symbol(s).

[0171] As described above, an embodiment of another aspect for further increasing the flexibility of scheduling compared to the embodiment in which the change in the slot configuration of the base station is permitted within a certain range will be disclosed.

[0172] The slot configuration of the symbol to which the PUCCH is assigned (or transmitted) can be freely changed.

[0173] The base station is free to change the configuration of slots to which PUCCH is allocated.

[0174] In one example where the PUCCH is a first type PUCCH, if the terminal fails to receive a group common PDCCH including a slot configuration information indicator for a slot transmitting the first type PUCCH, the terminal does not transmit the first type PUCCH on the allocated resources.

[0175] In another example where the PUCCH is a second-type PUCCH, if the terminal fails to receive a group common PDCCH including a slot configuration information indicator for a slot transmitting the second-type PUCCH, the terminal does not transmit the second-type PUCCH on the allocated resources.

[0176] According to the above-described embodiment, even if a terminal fails to receive a group common PDCCH and / or a terminal specific PDCCH from a base station, the possibility of transmitting a scheduled PUCCH and the transmission procedure are clearly defined, thereby solving communication error and delay problems.

[0177] [Other Examples] Another embodiment of this specification relates to an operation procedure of a terminal and a base station when the base station is free to change the slot configuration and the terminal successfully receives at least one of a slot configuration information indicator, a group common PDCCH including slot configuration related information, and a terminal specific PDCCH.

[0178] More specifically, when the configuration of a slot to which a PUCCH is assigned (or for which PUCCH transmission is scheduled) is changed and the changed slot configuration is contradictory to the PUCCH (i.e., when a symbol to which the PUCCH is assigned within a slot to which a PUCCH is assigned overlaps with a DL symbol due to the changed slot configuration), a terminal that processes the transmission of the PUCCH and its operating method, and a base station that processes the reception of the PUCCH and its operating method are disclosed.

[0179] In the changed slot configuration, the transmission of the assigned PUCCH may be possible (or valid, suitable) or not possible (so-called inconsistent slot configuration). Here, the slots capable of transmitting the PUCCH include, for example, a slot mainly consisting of UL symbols to which a first type PUCCH is assigned, or a slot including only UL symbols, and a slot mainly consisting of DL symbols to which a second type PUCCH is assigned, or a slot mainly consisting of UL symbols, or a slot including only UL symbols, as shown in FIG. 12. In addition, the slots not capable of transmitting the PUCCH include, for example, a case where a slot to which a first type PUCCH is assigned is changed to a slot mainly consisting of DL symbols or a slot including only DL symbols, or a case where a slot to which a second type PUCCH is assigned is changed to a slot including only DL symbols.

[0180] If the configuration of a slot for which PUCCH transmission is indicated is changed, the terminal may transmit the PUCCH as scheduled in the indicated slot if the transmission of the assigned PUCCH is possible (or valid, suitable) in the changed slot configuration. However, in order to transmit the PUCCH as scheduled even if the indicated slot is in conflict with the transmission of the PUCCH due to the change in configuration, a special agreement is required between the terminal and the base station. Hereinafter, a method for processing a PUCCH under a conflicting slot configuration will be described. Since the information transmitted to the base station via the PUCCH is UCI, the present invention includes an embodiment in which the term PUCCH is replaced with UCI in all embodiments of this specification. For example, a method for processing a PUCCH under a conflicting slot configuration corresponds to a method for processing UCI (HARQ-ACK, RI, etc.) under a conflicting slot configuration from the viewpoint of UCI.

[0181] How to process PUCCH in the indicated slot

[0182] First, a method of processing a PUCCH under an inconsistent slot configuration when an assigned PUCCH is a first-type PUCCH will be described. UCI (HARQ-ACK, RI, CSI, etc.) described with reference to FIG. 3 is mapped to the first-type PUCCH.

[0183] In one aspect, a method for processing a PUCCH includes a step of a terminal receiving a group common PDCCH including a slot configuration information indicator of a slot in which transmission of a first type PUCCH is indicated, and a step of transmitting a first type PUCCH or a second type PUCCH in the indicated slot according to the conditions shown in the following examples.

[0184] As an example, the terminal transmits the first type PUCCH in the indicated slot based on a result of comparing UL symbols according to a slot configuration in the slot in which transmission of the first type PUCCH is indicated with UL symbols allocated for transmission of the first type PUCCH. For example, if the UL symbols according to a slot configuration in the slot in which transmission of the first type PUCCH is indicated are larger than (or larger than or equal to) the UL symbols required for transmission of the first type PUCCH, the terminal transmits the first type PUCCH in the allocated resources in the slot.

[0185] As another example, the terminal transmits the first type PUCCH or drops or suspends the transmission based on a result of comparing the UL symbols according to the slot configuration in the slot in which the transmission of the first type PUCCH is instructed with the UL symbols required for the transmission of the first type PUCCH. For example, if the UL symbols according to the slot configuration in the slot in which the transmission of the first type PUCCH is instructed are smaller than the UL symbols required for the transmission of the first type PUCCH, the terminal drops the transmission of the first type PUCCH in the instructed slot. For example, if the slot in which the transmission of the PUCCH is instructed is a multiple slot, the terminal postpones the transmission of the first type PUCCH to a second slot that provides the UL symbols required for the transmission of the first type PUCCH, rather than the first slot in which the transmission of the first type PUCCH is scheduled. On the other hand, if the slot in which the transmission of the PUCCH is instructed is a single slot, the terminal abandons or suspends the scheduled transmission of the first type PUCCH.

[0186] As another example, the terminal transmits the first type PUCCH based on a result of comparing UL symbols according to a slot configuration in a slot in which transmission of the first type PUCCH is instructed, flexible symbols, and UL symbols allocated for transmission of the first type PUCCH. For example, if the number of symbols including UL symbols and flexible symbols according to a slot configuration in a slot in which transmission of the first type PUCCH is instructed is larger than (or larger than or equal to) the number of UL symbols required for transmission of the first type PUCCH, the terminal transmits the first type PUCCH on the allocated resources in the slot.

[0187] As another example, the terminal transmits the first type PUCCH, or drops or suspends the transmission based on a result of comparing the UL symbol according to the slot configuration in the slot in which the transmission of the first type PUCCH is instructed, the flexible symbol, and the UL symbol allocated to the transmission of the first type PUCCH. For example, if the number of symbols including the UL symbol and the flexible symbol according to the slot configuration in the slot in which the transmission of the first type PUCCH is instructed is smaller than the number of UL symbols required for the transmission of the first type PUCCH, the terminal abandons the transmission of the first type PUCCH in the instructed slot. For example, if the slot in which the transmission of the PUCCH is instructed is a multiple slot, the terminal transmits the first type PUCCH in a slot that satisfies the number of UL symbols allocated to the transmission of the first type PUCCH among the multiple slots. On the other hand, if the slot in which the transmission of the PUCCH is instructed is a single slot, the terminal abandons or suspends the scheduled transmission of the first type PUCCH.

[0188] In another aspect, the method for processing a PUCCH includes a step of receiving a group common PDCCH and a terminal specific PDCCH indicating a slot configuration of a slot in which a first type PUCCH is to be transmitted by a terminal, and transmitting the first type PUCCH or the second type PUCCH according to a condition. In this case, the terminal determines whether to transmit the first type PUCCH in the indicated slot according to the following exemplary conditions.

[0189] As an example, i) the base station can change the configuration of a slot to which a first type PUCCH is assigned, ii) the terminal successfully receives a group common PDCCH and a terminal specific PDCCH indicating the configuration of the slot to which a first type PUCCH is assigned, and iii) if the slot configuration is a slot in which a first type PUCCH can be transmitted, the terminal transmits the first type PUCCH using the assigned resources of the slot.

[0190] As another example, i) the base station can change the configuration of a slot to which a first type PUCCH is assigned, ii) the terminal successfully receives a group common PDCCH and a terminal specific PDCCH informing the configuration of the slot to which a first type PUCCH is assigned, but iii) if the slot configuration is a slot in which the first type PUCCH cannot be transmitted, the terminal does not transmit the first type PUCCH in the slot, transmits the first type PUCCH according to the changed slot configuration, or transmits the second type PUCCH instead of the first type PUCCH in the slot as shown in Figure 13. The specific operation of the terminal is as shown in Table 4 below.

[0191] [Table 4A] [Table 4B] [Table 4C] [Table 4D]

[0192] As another example, if i) the base station can change the configuration of the slot to which the first type PUCCH is assigned, ii) the terminal successfully receives a group common PDCCH and a terminal specific PDCCH informing the terminal of the configuration of the slot to which the first type PUCCH is assigned, iii) the slot configuration is a slot in which the first type PUCCH can be transmitted, iv) a PUSCH is assigned to the slot (or transmission of a PUSCH is scheduled) and the slot is set for simultaneous transmission of the PUCCH and PUSCH, and v) the slot is set not to transmit the first type PUCCH because there is a possibility that IMD (inter-modulation distortion) may occur due to frequency separation between the PUCCH and the PUSCH, then the terminal performs at least one of the operations according to Table 4.

[0193] Next, a case where the allocated PUCCH is a second-type PUCCH will be described. The UCI (HARQ-ACK, RI, CSI, etc.) described with reference to Fig. 3 is mapped to the second-type PUCCH.

[0194] In one aspect, the method for processing the PUCCH includes a step of receiving a group common PDCCH including a slot configuration information indicator of a slot in which the transmission of the second type PUCCH is indicated by a terminal, and a step of transmitting the second type PUCCH according to a condition. In this case, the terminal determines whether to transmit the second type PUCCH according to the following exemplary conditions.

[0195] As an example, the terminal transmits the second type PUCCH based on a result of comparing UL symbols according to a slot configuration in a slot instructed to transmit the second type PUCCH with UL symbols allocated for transmitting the second type PUCCH. For example, if the UL symbols according to a slot configuration in a slot instructed to transmit the second type PUCCH are larger than (or larger than or equal to) the UL symbols required for transmitting the second type PUCCH, the terminal transmits the second type PUCCH on the allocated resources in the slot.

[0196] As another example, the terminal transmits the second type PUCCH, or drops or suspends the transmission based on a result of comparing the UL symbols according to the slot configuration in the slot instructed to transmit the second type PUCCH with the UL symbols required for the transmission of the second type PUCCH. For example, if the UL symbols according to the slot configuration in the slot instructed to transmit the second type PUCCH are smaller than the UL symbols allocated to the transmission of the second type PUCCH, the terminal abandons the transmission of the second type PUCCH in the indicated slot. For example, if the slot instructed to transmit the PUCCH is a multiple slot, the terminal transmits the second type PUCCH in the second slot that satisfies the number of UL symbols required for the transmission of the second type PUCCH from among the multiple slots. On the other hand, if the slot instructed to transmit the PUCCH is a single slot, the terminal abandons or suspends the scheduled transmission of the second type PUCCH.

[0197] As another example, the terminal transmits the second type PUCCH based on a result of comparing UL symbols according to a slot configuration in a slot in which transmission of the second type PUCCH is instructed, flexible symbols, and UL symbols allocated for transmission of the second type PUCCH. For example, if the number of symbols including UL symbols and flexible symbols according to a slot configuration in a slot in which transmission of the second type PUCCH is instructed is larger than (or larger than or equal to) the number of UL symbols required for transmission of the second type PUCCH, the terminal transmits the second type PUCCH in the allocated resources in the slot.

[0198] As another example, the terminal transmits the second type PUCCH, or drops or suspends the transmission based on a result of comparing the UL symbols according to the slot configuration in the slot in which the transmission of the second type PUCCH is instructed, the flexible symbols, and the UL symbols required for the transmission of the second type PUCCH. For example, if the number of symbols including the UL symbols and the flexible symbols according to the slot configuration in the slot in which the transmission of the second type PUCCH is instructed is smaller than the UL symbols required for the transmission of the second type PUCCH, the terminal abandons the transmission of the second type PUCCH in the instructed slot. For example, if the slot in which the transmission of the PUCCH is instructed is a multiple slot, the terminal transmits the second type PUCCH in the second slot that satisfies the number of UL symbols required for the transmission of the second type PUCCH from among the multiple slots. On the other hand, if the slot in which the transmission of the PUCCH is instructed is a single slot, the terminal abandons or suspends the scheduled transmission of the second type PUCCH.

[0199] How to process PUCCH in a slot other than the one specified

[0200] The method for processing the PUCCH according to this embodiment includes a step in which, if the configuration of a slot for which PUCCH transmission is instructed is changed, the terminal transmits the PUCCH in a different slot after the instructed slot. That is, if a UL symbol carrying the PUCCH in a slot to which the PUCCH is assigned overlaps with a DL symbol in the slot according to the changed slot configuration, the terminal postpones (postpones or defers) the transmission of the PUCCH to a different slot that can transmit the PUCCH other than the instructed slot.

[0201] In the postponed different slot, a PUCCH of the same type as the assigned specific type PUCCH may be transmitted, or a PUCCH of a different type from the assigned specific type PUCCH may be transmitted. In the postponed different slot, a PUCCH of the same type as the assigned specific type PUCCH is transmitted, but the time domain allocation for PUCCH transmission may be different from the assigned specific type PUCCH.

[0202] First, if the assigned PUCCH is a first type PUCCH, a method of processing the PUCCH under an inconsistent slot configuration will be described. Here, the first type PUCCH includes UCI, particularly HARQ-ACK, RI, CSI, etc., as described with reference to Figure 3. Since the information mapped to the first type PUCCH is UCI, the present invention includes an embodiment in which the term first type PUCCH is replaced with UCI in all embodiments of this specification.

[0203] FIG. 14 is a diagram showing an example in which the slot configuration is changed so that the PUCCH is transmitted to another slot.

[0204] Referring to FIG. 14(a), the terminal recognizes that the slot N mainly consisting of UL symbols to which the first type PUCCH (Long PUCCH) is assigned has been changed by the base station to a slot mainly consisting of DL symbols to which the first type PUCCH is not transmitted, through reception of a group common PDCCH and / or a terminal specific PDCCH informing of the change in the slot configuration. In this case, the terminal does not transmit the first type PUCCH in slot N, but transmits the first type PUCCH in the postponed slot N+K. That is, the first type PUCCH, which is the same type as the assigned first type PUCCH, is transmitted in the postponed slot N+K. Here, slot N+K is the closest slot capable of transmitting the assigned first type PUCCH, and is a slot mainly consisting of UL symbols.

[0205] In other words, if the base station changes the configuration of the slot to which the first type PUCCH is assigned, and the terminal successfully receives a group common PDCCH and a terminal specific PDCCH including information on the slot configuration, but the slot configuration is a slot that cannot transmit the first type PUCCH, the terminal does not transmit the first type PUCCH in that slot, but transmits the first type PUCCH in the closest subsequent slot that can transmit the first type PUCCH.

[0206] Meanwhile, referring to FIG. 14(b), the terminal recognizes that the slot N mainly including UL symbols to which the first type PUCCH (Long PUCCH) is assigned has been changed by the base station to a slot configuration in which the first type PUCCH cannot be transmitted through reception of a group common PDCCH and / or a terminal specific PDCCH informing of a change in slot configuration. In this case, the terminal does not transmit the first type PUCCH in slot N, but transmits a second type PUCCH (Short PUCCH) in slot N+K. In the postponed slot N+K, a second type PUCCH of a different type from the assigned first type PUCCH is transmitted. That is, in the postponed slot N+K, a second type PUCCH of a changed type from the assigned first type PUCCH is transmitted. Here, slot N+K is the closest slot capable of transmitting the second type PUCCH, and is a slot mainly including DL symbols.

[0207] In other words, if the base station changes the configuration of the slot to which the first type PUCCH is assigned, and the terminal successfully receives a group common PDCCH and a terminal specific PDCCH including the slot configuration information, but the slot configuration is a slot that cannot transmit the first type PUCCH, the terminal does not transmit the first type PUCCH in that slot, but transmits the second type PUCCH in the closest subsequent slot that can transmit the second type PUCCH.

[0208] Here, the UCI transmitted via the second-type PUCCH includes only a portion of the UCI that was originally scheduled for transmission depending on its importance, and does not include the remaining portion.

[0209] In one aspect, the terminal transmits some information of UCI according to the importance of the UCI type that should be transmitted via the first type PUCCH. As an example, the importance or priority of the UCI type that can be transmitted via the first type PUCCH is defined in the order of HARQ-ACK, RI, CSI, and beam related information (BRI, e.g., beam restoration request) (HARQ-ACK>RI>CSI>BRI). As another example, the importance or priority of the UCI type that can be transmitted via the first type PUCCH is defined in the order of HARQ-ACK, beam related information, RI, and CSI (HARQ-ACK>BRI>RI>CSI). As yet another example, the importance or priority of the UCI type that can be transmitted via the first type PUCCH is defined in the order of beam related information, HARQ-ACK, RI, and CSI (BRI>HARQ-ACK>RI>CSI).

[0210] In another aspect, the terminal transmits some types of UCI with high importance via the second type PUCCH according to the amount of UCI that can be transmitted via the second type PUCCH.

[0211] In another aspect, if the information transmitted on the first type PUCCH includes information on a primary serving cell (PCell) and a secondary serving cell (SCell), the terminal may transmit some information according to the importance or priority between the primary serving cell and the secondary serving cell. As an example, the terminal transmits only UCI related to the primary serving cell via the second type PUCCH. As another example, if the information transmitted on the first type PUCCH includes information on a primary serving cell or a primary secondary serving cell (PSCell), the terminal transmits only UCI related to the primary serving cell or the primary secondary serving cell via the second type PUCCH.

[0212] In yet another aspect, the terminal preferentially transmits UCI for a DL cell linked to a PUCCH transmittable cell (eg, SIB linked DL cell) on each PUSCH group via a second-type PUCCH.

[0213] In yet another aspect, the terminal transmits the second type PUCCH based on the importance between the primary serving cell and the secondary serving cell and the importance of the UCI type. As an example, the terminal transmits a type of UCI with a high priority among UCIs (HARQ-ACK, beam-related information, RI, CSI, etc.) related to the primary serving cell through the second type PUCCH. This is because the type of UCI transmitted through the second type PUCCH is considered to be related to a serving cell rather than the type of UCI. Of course, the type of UCI transmitted through the second type PUCCH may be considered to be related to a serving cell rather than the type of UCI. The priority between the serving cell and the UCI may be included in configuration information such as RRC signaling and transmitted to the terminal by the base station, or may be defined individually according to the size of the payload of the second type PUCCH.

[0214] In yet another aspect, the terminal transmits only up to a certain number of bits of UCI on the second-type PUCCH depending on the size of the UCI payload, for example, the terminal is configured to transmit up to X bits of UCI (where X is {2<=X<=tens of bits}) on the second-type PUCCH.

[0215] In yet another aspect, the terminal is configured to transmit up to X bits (where X is {2<=X<=tens of bits}) of HARQ-ACK or BRI on a second type PUCCH based on a particular type of UCI (i.e., the number of bits of HARQ-ACK or BRI).

[0216] How to handle HARQ-ACK in a slot other than the one specified

[0217] A method for processing a HARQ-ACK according to one aspect includes the steps of: a base station changing a configuration of slot N to which a PUCCH is assigned; a terminal receiving a group common PDCCH and / or a terminal specific PDCCH including information regarding the changed slot configuration; and if the assigned PUCCH is not transmitted under the changed slot configuration (i.e., if the changed slot configuration is inconsistent with the assigned PUCCH), the terminal postponing HARQ-ACK information of the assigned PUCCH by K slots from slot N (i.e., N+K) and then transmitting the assigned PUCCH.

[0218] Here, the "allocated PUCCH" according to this embodiment may be a first type PUCCH or a second type PUCCH. In addition, the value of K is determined according to the time it takes for the base station to perform PUCCH feedback from PDSCH scheduling. In a slot capable of transmitting a PUCCH after the slot N+K, no PUCCH for HARQ-ACK feedback of other terminals may be allocated. For example, if the terminal and the base station communicate with each other based on FDD (Frequency Division Duplex), a PUCCH for HARQ-ACK of other terminals may not be transmitted (or allocated) in a slot transmitted after 4 ms (common to 3GPP LTE, LTE-A, and NR). The value of K is provided via an RRC signal.

[0219] A method for processing HARQ-ACK according to another aspect includes the steps of: a base station changing a configuration of slot N to which a first type PUCCH is assigned; a terminal receiving a group common PDCCH and / or a terminal specific PDCCH including information regarding the changed slot configuration; and, if the first type PUCCH cannot be transmitted under the changed slot configuration but a second type PUCCH can be transmitted, the terminal not transmitting the first type PUCCH but waiting for PUCCH reallocation by the base station.

[0220] As an example, such a method of processing the HARQ-ACK further includes a step of the base station retransmitting the PDSCH to a terminal that does not transmit the first type PUCCH including the HARQ-ACK of the PDSCH, and a step of allocating resources for transmitting a new first type PUCCH in the PDCCH that schedules the PDSCH.

[0221] According to another aspect, the method of processing HARQ-ACK includes a step of changing a configuration of slot N to which a PUCCH is assigned by a base station, and a step of selectively transmitting the PUCCH based on the slot configuration when the terminal cannot receive a group common PDCCH that transmits configuration information of slot N but can know the slot configuration of slot N by receiving a terminal specific PDCCH that schedules a PDSCH (or PUSCH). As an example, if the slot configuration is a slot configuration in which the assigned PUCCH can be transmitted, the terminal transmits the PUCCH. As another example, if the slot configuration is a slot configuration in which the assigned PUCCH cannot be transmitted, the terminal does not transmit the PUCCH. Here, the assigned PUCCH may be a first type PUCCH or a second type PUCCH.

[0222] [Other Examples] Another embodiment of the present specification relates to slot configuration information transmitted from a base station to a terminal, and a method of operating the terminal and the base station based on the information. The base station informs the terminal of the slot configuration information using various information and procedures. The slot configuration information includes various embodiments as follows.

[0223] Slot configuration information In one aspect, the information on the slot configuration includes semi-static DL / UL assignment information. For example, the base station transmits default slot format or semi-static DL / UL assignment information (or semi-static slot-format information (SFI)) to the terminal in a cell-specific manner, and further transmits the semi-static DL / UL assignment information to the terminal via a terminal-specific RRC message. Meanwhile, upon receiving the semi-static DL / UL assignment information (or default slot format), the terminal knows what slot configuration the subsequent slots have. The semi-static DL / UL assignment information (or default slot format) indicates information on whether each symbol in the corresponding slot is a DL symbol, a UL symbol, or a flexible symbol other than a DL symbol and a UL symbol. Here, it is assumed that the terminal is designated as "flexible" a symbol that is not designated as a DL symbol or a UL symbol through the semi-static DL / UL assignment information (or default slot format).

[0224] In another aspect, the information on the slot configuration includes dynamic slot-format information (SFI) transmitted in a group common PDCCH. The dynamic slot format information indicates information on whether each symbol in a slot is a DL symbol, a UL symbol, or a flexible symbol other than a DL symbol and a UL symbol. The flexible symbol may replace a gap or may be used for a purpose other than a gap. The group common PDCCH on which the dynamic slot format information is transmitted is scrambled with the SFI-RNTI. Whether or not a terminal monitors the dynamic slot format information is configured or indicated by an RRC message. A terminal that is not instructed to monitor by an RRC message does not monitor the dynamic slot format information.

[0225] In another aspect, the information on the slot configuration is scheduling information included in the DCI mapped to the UE-specific PDCCH. For example, if the DCI contains information on the start position and length of the PDSCH, the symbol on which the corresponding PDSCH is scheduled is assumed to be a DL symbol. Also, if the DCI contains information on the start position and length of the PUSCH, the symbol on which the corresponding PUSCH is scheduled is assumed to be a UL symbol. If the DCI contains information on the start position and length of the PUSCH for HARQ-ACK transmission, the symbol on which the corresponding PUSCH is scheduled is assumed to be a UL symbol.

[0226] How to determine the symbol direction and how to process PUCCH As described above, since there are various types of slot configuration information, the terminal receives different types of slot configuration information for the same slot. And, each slot configuration information indicates a different symbol direction for the same slot. In this case, the terminal and the base station change or determine the symbol direction according to the following rules.

[0227] In one aspect, the DL symbol and UL symbol of the semi-static DL / UL allocation information (or default slot format) do not change direction according to the dynamic slot configuration information or the scheduling information. Therefore, if the PUCCH is located in the UL symbol set by the semi-static DL / UL allocation information (or default slot format), the terminal transmits the PUCCH regardless of the dynamic slot configuration information or the scheduling information. If at least one of the symbols to which the PUCCH is allocated overlaps with the DL symbol of the default slot format, the terminal does not transmit the corresponding PUCCH or changes the length of the PUCCH to match the length of the remaining symbols excluding the corresponding DL symbol and transmits it. Here, the allocated PUCCH may be a first type PUCCH or a second type PUCCH.

[0228] In another aspect, the flexible symbol set by the semi-static DL / UL allocation information (or default slot format) is determined or changed in direction according to the dynamic slot configuration information or the scheduling information. If at least one of the symbols to which the PUCCH is allocated overlaps with a flexible symbol of the semi-static DL / UL allocation information (or default slot format), the terminal determines whether to transmit the PUCCH according to the type (HARQ-ACK, RI, CSI, etc.) of the information (i.e., UCI) transmitted by the corresponding PUCCH. In this embodiment, the PUCCH may be a first type PUCCH or a second type PUCCH.

[0229] For example, if the information transmitted on the PUCCH includes a HARQ-ACK for the PDSCH, the UE transmits the PUCCH at a predetermined position regardless of the dynamic slot configuration information notified on the group common PDCCH, where the predetermined position is indicated by the DCI for scheduling the PDSCH.

[0230] As another example, if the information transmitted on the PUCCH does not include a HARQ-ACK for the PDSCH, the terminal transmits the PUCCH if the flexible symbol overlapping with the PUCCH is indicated as a UL symbol by the dynamic slot configuration information.

[0231] As another example, if at least one of the symbols to which the PUCCH is assigned is indicated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) by the dynamic slot configuration information, the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol to which the PUCCH is assigned, the terminal does not transmit the PUCCH.

[0232] In another aspect, if at least one of the symbols to which the PUCCH is assigned overlaps with a flexible symbol set by semi-static DL / UL allocation, the terminal determines whether to transmit the PUCCH based on signaling that triggers transmission of the PUCCH.

[0233] For example, if the PUCCH is triggered via the DCI, the UE transmits the PUCCH at a predetermined position, regardless of the dynamic slot configuration information, where the predetermined position is indicated by the DCI.

[0234] As another example, if the PUCCH is triggered via a terminal-specific RRC message, the terminal transmits the PUCCH if the symbol to which the PUCCH is assigned is indicated as a UL symbol by the dynamic slot configuration information.

[0235] As another example, if at least one of the symbols to which the PUCCH is assigned is indicated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) by the dynamic slot configuration information, the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol to which the PUCCH is assigned, the terminal does not transmit the PUCCH.

[0236] How to process repeated PUCCH The terminal repeatedly transmits the PUCCH over several slots. Hereinafter, such a PUCCH is called a repetition PUCCH. In this embodiment, the repetition PUCCH may be a first type PUCCH or a second type PUCCH. The base station sets the number of slots in which the repetition PUCCH is transmitted to the terminal via an RRC message. In each slot, the start symbol and the end symbol of the PUCCH are the same for each repeated slot. Hereinafter, the repetition PUCCH may or may not be transmitted depending on the cases in which the DL symbol, the UL symbol, and the flexible symbol are set by the RRC such as semi-static DL / UL allocation information (or default slot pattern) and the dynamic slot configuration information. Hereinafter, a method of processing the repetition PUCCH for each case will be disclosed.

[0237] When repeated PUCCH overlaps with UL symbols If the repeated PUCCH is located in a UL symbol set as semi-static DL / UL allocation information (or default slot pattern) in each slot among the slots instructed to transmit, the UE transmits the PUCCH in that slot regardless of receiving dynamic slot configuration information or scheduling information. Here, the direction of the DL symbol and the UL symbol according to the slot configuration set by the RRC message such as the semi-static DL / UL allocation information (or default slot pattern) does not change depending on the dynamic slot configuration information or scheduling information.

[0238] When repeated PUCCH overlaps with DL symbols If at least one of the symbols allocated to the repeat PUCCH in each slot among the slots instructed to transmit the repeat PUCCH overlaps with a DL symbol according to semi-static DL / UL allocation information, the terminal does not transmit the PUCCH in the corresponding slot, or changes the length of the PUCCH to match the length of the remaining symbols excluding the corresponding DL symbol and transmits it. Alternatively, if at least one of the symbols allocated to the PUCCH in one slot among the slots instructed to transmit the repeat PUCCH overlaps with a DL symbol set as semi-static DL / UL allocation information (or default slot pattern), the terminal does not transmit the repeat PUCCH not only in the corresponding slot but also in the following slots.

[0239] When repeated PUCCH overlaps with flexible symbols If at least one symbol among the symbols assigned to the repetitive PUCCH in each slot among the slots instructed to transmit the repetitive PUCCH overlaps with a flexible symbol set by the semi-static DL / UL allocation information, the terminal determines whether to transmit the repetitive PUCCH based on i) the type (HARQ-ACK, RI, CSI, etc.) of information (i.e., UCI) transmitted by the repetitive PUCCH, or ii) the signaling triggering the PUCCH transmission, or iii) the dynamic slot configuration information. In this embodiment, the repetitive PUCCH may be a first type PUCCH or a second type PUCCH.

[0240] In one aspect, if at least one of the symbols assigned to the repeat PUCCH in each slot among the slots instructed to transmit the repeat PUCCH overlaps with a flexible symbol set by semi-static DL / UL allocation information, the terminal determines whether to transmit the repeat PUCCH based on the type of information (i.e., UCI) transmitted by the repeat PUCCH (HARQ-ACK, RI, CSI, etc.).

[0241] For example, if the information transmitted in the repetitive PUCCH includes a HARQ-ACK for a PDSCH scheduled by a PDCCH, the UE transmits the repetitive PUCCH at a predetermined position regardless of the dynamic slot configuration information notified in the group common PDCCH, where the predetermined position is indicated by the DCI that schedules the PDSCH.

[0242] As another example, if the information transmitted in the repetitive PUCCH does not include a HARQ-ACK for a PDSCH, or includes a HARQ-ACK for a PDSCH configured in RRC, the terminal transmits the repetitive PUCCH if a flexible symbol overlapping with the repetitive PUCCH is indicated as a UL symbol by the dynamic slot configuration information.

[0243] As another example, if at least one of the symbols assigned to the repetition PUCCH in each slot among the slots instructed to transmit the repetition PUCCH is designated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) according to the dynamic slot configuration information, the terminal does not transmit the repetition PUCCH in that slot. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol assigned to the repetition PUCCH, the terminal does not transmit the repetition PUCCH in that slot. Even if the terminal is unable to transmit the repetition PUCCH in the corresponding slot, the terminal transmits the repetition PUCCH in the next slot if a certain condition is satisfied (when the flexible symbol overlapping with the repetition PUCCH is designated as a UL symbol according to the dynamic slot configuration information).

[0244] As yet another example, if the terminal does not transmit a repeat PUCCH in one of the slots in which the repeat PUCCH is instructed to be transmitted for any reason (symbol direction inconsistency caused by dynamic slot configuration information, or the terminal fails to receive dynamic slot configuration information), the terminal does not perform repeated transmission of the PUCCH in subsequent slots.

[0245] Meanwhile, in another aspect, if at least one of the symbols to which the repeat PUCCH is assigned overlaps with a flexible symbol set by semi-static DL / UL allocation, the terminal determines whether to transmit the repeat PUCCH based on signaling that triggers transmission of the repeat PUCCH.

[0246] For example, if a repetitive PUCCH is triggered via DCI, the UE transmits the repetitive PUCCH at a predetermined position, regardless of dynamic slot configuration information, where the predetermined position is indicated by the DCI.

[0247] As another example, if a repeat PUCCH is triggered via a terminal-specific RRC message, the terminal transmits the repeat PUCCH if the symbol to which the repeat PUCCH is assigned is indicated as a UL symbol by the dynamic slot configuration information.

[0248] As another example, if at least one of the symbols to which the repetition PUCCH is assigned is designated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) according to the dynamic slot configuration information in each slot among the slots designated to transmit the repetition PUCCH, the terminal does not transmit the repetition PUCCH in that slot. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol to which the repetition PUCCH is assigned, the terminal does not transmit the repetition PUCCH in that slot. Even if the terminal is unable to transmit the repetition PUCCH in the corresponding slot, the terminal transmits the repetition PUCCH in the next slot if a certain condition is satisfied (when the flexible symbol overlapping with the repetition PUCCH is designated as a UL symbol according to the dynamic slot configuration information).

[0249] As yet another example, if the terminal does not transmit a repeat PUCCH in one of the slots in which the repeat PUCCH is instructed to be transmitted for any reason (symbol direction inconsistency caused by dynamic slot configuration information, or the terminal fails to receive dynamic slot configuration information), the terminal does not perform repeated transmission of the PUCCH in subsequent slots.

[0250] Here, the number of slots K in which the transmission of the PUCCH is repeated (or attempted) is defined as follows:

[0251] As an example, the K slots configured to transmit the repeated PUCCH may not necessarily be consecutive. For example, if a terminal is configured to transmit the PUCCH repeatedly for K slots, the terminal repeatedly transmits the PUCCH until the count of the number of actually transmitted slots reaches K, excluding slots in which the repeated PUCCH is not transmitted. (Repetition Method 1)

[0252] As another example, the K slots configured to transmit the repeated PUCCH must be consecutive. For example, if a terminal is configured to transmit the PUCCH repeatedly for K slots, it transmits the PUCCH repeatedly from slot N in which the repeated PUCCH is instructed to be transmitted until the count of the number of slots in which PUCCH transmission is attempted (including slots in which the repeated PUCCH is not transmitted) reaches K. In other words, a terminal that first attempts PUCCH transmission in slot N attempts PUCCH transmission up to slot (N+K-1), and does not transmit the PUCCH any further in slot (N+K) even if the number of times (or slots) in which the PUCCH is actually repeatedly transmitted is less than K. (Repetition Method 2)

[0253] As another example, the UE attempts to transmit the PUCCH in K consecutive slots among the remaining slots excluding the slots in which the PUCCH cannot be transmitted due to the semi-static DL / UL allocation information from the slot N in which the PUCCH transmission is instructed (repetition method 3).

[0254] FIG. 15 is a diagram showing slots in which a repetitive PUCCH is transmitted according to a slot configuration.

[0255] 15(a), when the terminal is configured to transmit the first type PUCCH 1500 repeatedly over two slots (slot configuration by semi-static DL / UL allocation), the terminal transmits the first type PUCCH 1500. Here, the flexible symbol is changed to a DL symbol or an UL symbol according to dynamic slot configuration information or scheduling information of terminal specific DCI. It is assumed that the symbols transmitting the first type PUCCH 1500 are symbols 8 to 13 in the slot. Here, one slot includes 14 symbols, and the symbol indexes are from 0 to 13.

[0256] Looking at the slot configuration with semi-static DL / UL allocation, in slot 0, symbol 0 is a DL symbol and symbols 7 to 13 are UL symbols. In slot 1, symbols 0 to 10 are DL symbols and symbols 12 to 13 are UL symbols. In slot 2, symbols 0 to 1 are DL symbols and symbols 10 to 13 are UL symbols. In slot 3, symbol 0 is a DL symbol and symbols 7 to 13 are UL symbols. The remaining symbols excluding the UL and DL symbols are flexible symbols.

[0257] Therefore, the first type PUCCH 1500 is transmitted in slot 0 and slot 3 regardless of the dynamic slot configuration information, is not transmitted in slot 1 regardless of the dynamic slot configuration information, and is transmitted in slot 2 if the dynamic slot configuration information indicates that symbols 8 and 9 are UL symbols, but is not transmitted otherwise.

[0258] 15(a) shows slots in which the terminal attempts to transmit the first type PUCCH 1500 by the above-mentioned repetition method 1. Here, it is assumed that symbols 8 and 9 in slot 2 are not designated as UL symbols by the dynamic slot configuration information, and the terminal cannot transmit the first type PUCCH. The terminal actually transmits the first type PUCCH 1500 twice, in slots 0 and 3. Therefore, the terminal does not repeatedly transmit the first type PUCCH 1500 any more after slot 3.

[0259] 15(b) shows slots in which transmission of the first type PUCCH 1500 is attempted using the above-mentioned repetition method 2. Since the first type PUCCH 1500 is configured to be repeatedly transmitted in two slots (K=2), the terminal attempts to transmit the first type PUCCH 1500 in slot 0 and slot 1. The terminal attempts to transmit the first type PUCCH in slot 1, but is unable to transmit the first type PUCCH since it overlaps with a DL symbol due to the semi-static DL / UL allocation information setting.

[0260] Figure 15(c) shows slots in which the first type PUCCH 1500 is attempted to be transmitted using the above-mentioned repetition method 3. The first type PUCCH 1500 is configured to be repeatedly transmitted in two slots (K=2), but slot 1 is a slot in which the first type PUCCH 1500 cannot be transmitted due to semi-static DL / UL allocation information. Therefore, the terminal attempts to transmit the first type PUCCH 1500 in slot 0 and slot 2. Here, slot 2 actually transmits or does not transmit the first type PUCCH 1500 as instructed by the dynamic slot configuration information.

[0261] [Still another embodiment] Another embodiment of the present invention relates to a method for transmitting a physical channel by a terminal or a base station to improve the coverage of the physical channel in a wireless communication system based on a slot configuration including a DL symbol, a flexible symbol, and a UL symbol based on TDD, and a decision procedure thereof. The physical channel transmitted by the terminal is an uplink physical channel, and includes a PRACH, a PUCCH, a PUSCH, an SRS, etc. The physical channel transmitted by the base station is a downlink physical channel, and includes a PDSCH, a PDCCH, a PBCH, etc. Hereinafter, a procedure of the terminal and the base station regarding the repeated transmission of the PUCCH is defined, a procedure of the terminal and the base station regarding the repeated transmission of the PUSCH is defined, and a procedure of the terminal and the base station regarding the method of following the repeated transmission of the PDSCH is defined. In the following embodiment, the PUCCH or the repeated PUCCH is a first type PUCCH or a second type PUCCH.

[0262] UE and BS Procedures for Repeated Transmission of PUCCH The number of slots in which the PUCCH is transmitted or the number of repetitions of the PUCCH transmission is, for example, one of a number of predefined values ​​(i.e., 1, 2, 4, 8), and the value set in the actual terminal among the number of values ​​is transmitted by an RRC message. If the number of repetitions of the PUCCH transmission is set to 1, it indicates a general PUCCH rather than a repetitive PUCCH.

[0263] The start and length of a symbol in which the PUCCH is transmitted within a slot are set within one PUCCH resource set by an RRC parameter. A PUCCH resource set including at least one PUCCH resource is set or assigned to the terminal by RRC signaling. Meanwhile, the base station indicates at least one PUCCH resource index of the PUCCH resource set to the terminal by dynamic signaling (ieDCI). For example, the base station indicates the PUCCH resource index to the terminal based on a PUCCH resource indicator (PRI) included in the DCI or a combination of the PRI and an implicit mapping scheme. Here, the PRI is 2 bits or 3 bits.

[0264] The PUCCH resource set or PUCCH resource index set in this way is maintained the same over multiple slots in which the PUCCH is repeatedly transmitted. The UE determines whether to transmit the PUCCH indicated by the DCI. This determination is based on semi-static DL / UL allocation information. The semi-static DL / UL allocation information used in the determination includes at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) indicated by RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) additionally indicated to the UE by RRC signaling.

[0265] As an example, the UL-DL configuration shared information indicates a period to which the semi-static DL / UL allocation information is applied, and indicates the number of DL symbols, the number of UL symbols, and the number of flexible symbols configured across multiple slots included in the period.

[0266] As another example, the UL-DL configuration dedicated information includes information for replacing (overriding) flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols, i.e., the terminal replaces flexible symbols in the slot format provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration dedicated information.

[0267] Within each slot instructed by the base station to transmit a PUCCH, if the symbol on which the PUCCH is transmitted overlaps with the symbol(s) indicated by the semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUCCH based on the direction of the indicated symbol(s).

[0268] As an example, if the indicated symbol(s) is a DL symbol, the terminal postpones transmission of the PUCCH to the next slot, and if one of the indicated symbol(s) is a DL symbol(s) and a flexible symbol(s), the terminal transmits the PUCCH in the corresponding slot.

[0269] As another example, if the indicated symbol is a DL symbol or a flexible symbol(s), the terminal postpones the transmission of the PUCCH to the next slot, and if the indicated symbol is a UL symbol, the terminal transmits the PUCCH in the corresponding slot and postpones the PUCCH that is not being transmitted in the corresponding slot to the next slot.

[0270] The terminal repeatedly transmits the PUCCH on the multiple slots until the number of repetitions of PUCCH transmission configured by the RRC message is reached. When determining a slot for PUCCH transmission on the multiple slots, the terminal considers UL symbols and unknown (or flexible) symbols according to information transmitted by the RRC message. As an example, the terminal determines a slot in which the PUCCH start position and the number of UL symbols are included in the UL symbols and flexible symbols configured by the RRC message as a slot resource for PUCCH transmission. Then, the base station receives the PUCCH repeatedly transmitted by the terminal through the multiple slots based on at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information.

[0271] If at least one symbol of the symbols in which the PUCCH is transmitted in the first slot among the slots assigned to the transmission of the repetitive PUCCH overlaps with a DL symbol, the terminal does not transmit the PUCCH in the corresponding slot and cancels the transmission of the PUCCH. That is, if the symbols in which the PUCCH is transmitted in the first slot among the slots assigned to the transmission of the repetitive PUCCH are composed of UL symbols (etc.) and flexible symbols, the terminal transmits the PUCCH in the corresponding slot. Also, if at least one symbol of the symbols in which the PUCCH is transmitted after the first slot among the slots assigned to the transmission of the repetitive PUCCH overlaps with a DL symbol or flexible symbol, the terminal does not transmit the PUCCH in the corresponding slot and cancels the transmission of the PUCCH. That is, if the slots in which the base station instructs the transmission of the PUCCH and the symbols instructed to transmit the PUCCH in the slots assigned to the transmission of the repetitive PUCCH are composed of UL symbols (etc.), the terminal transmits the PUCCH in the corresponding slot.

[0272] In the following, a method for processing PUCCH regarding gap symbols is disclosed.

[0273] A gap for DL-UL switching exists between DL symbols and UL symbols. The gap is located in a flexible symbol. That is, some symbol(s) of the flexible symbol(s) between DL symbols and UL symbols are used for DL-UL switching gap and are not used for DL ​​reception or UL transmission. The number of symbols for the gap is G. G may be fixed to a specific value such as 1 or 2, may be configured in the UE by an RRC message, or may be determined via a timing advance value.

[0274] Within each slot instructed by the base station to transmit a PUCCH, if the symbol on which the PUCCH is transmitted overlaps with the symbol(s) configured by semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUCCH based on the type (or direction) of the indicated symbol(s).

[0275] For example, if the indicated symbol(s) are all UL symbols, the terminal transmits a PUCCH, and if at least one of the indicated symbol(s) is a DL symbol or at least one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit a PUCCH in the corresponding slot, and postpones a PUCCH that is not being transmitted in the corresponding slot to the next slot.

[0276] That is, in a slot instructed by the base station to transmit the PUCCH, if the symbol on which the PUCCH is transmitted is a UL symbol, the terminal transmits the PUCCH, and if the symbol on which the PUCCH is 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 the corresponding slot. The terminal postpones the PUCCH that is not being transmitted in the corresponding slot to the next slot. That is, if the PUCCH overlaps with the DL symbol and any one of the G symbols that can be used as a gap, it is not transmitted and transmission is postponed to the next slot.

[0277] Meanwhile, regarding a method of processing a PUCCH in multiple slots, a terminal repeatedly transmits a PUCCH in multiple slots until the number of repetitions of PUCCH transmission configured by an RRC message is reached. The terminal determines a slot for PUCCH transmission in multiple slots based on the type and number of symbols according to information transmitted in the RRC message.

[0278] The terminal determines a 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 allocation information. For example, if "the number of UL symbols + the number of flexible symbols - the number of gap symbols" in a slot includes the start position of the PUCCH and the number of UL symbols in which the PUCCH is transmitted, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits the PUCCH. Alternatively, considering that one slot includes 14 symbols, if "14 - (the number of DL symbols in the slot + the number of gap symbols)" includes the start position of the PUCCH and the number of UL symbols in which the PUCCH is transmitted, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits the PUCCH.

[0279] In this case, the base station receives the PUCCH repeatedly transmitted by the terminal through multiple slots based on at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information.

[0280] FIG. 16 is a diagram showing whether PUCCH transmission is possible depending on the slot configuration.

[0281] Referring to FIG. 16, the slot configuration configured according to semi-static DL / UL allocation information sequentially includes five DL symbols (denoted as "D"), three flexible symbols (denoted as "X"), and six UL symbols (denoted as "U").

[0282] 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.

[0283] First, Figure 16(a) shows the case where the gap is one symbol (G = 1). If G = 1, PUCCH allocation #0 and PUCCH allocation #1, which do not overlap with the flexible symbol immediately following the DL symbol, can be transmitted, but PUCCH allocation #2, which overlaps with the flexible symbol immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocation #2 is postponed to the next slot. Of course, the terminal also uses the same criteria to determine whether to transmit PUCCH allocation #2 in the next slot.

[0284] Figure 16(b) shows the case where the gap is two symbols (G=2). When G=2, PUCCH allocation #0, which does not overlap with two consecutive or flexible symbols immediately following the DL symbol, can be transmitted, but PUCCH allocation #1 and PUCCH allocation #2, which overlap with two consecutive flexible symbols immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocations #1 and #2 is postponed to the next slot. Of course, the terminal uses the same criteria to determine whether to transmit PUCCH allocations #1 and #2 in the next slot as well.

[0285] UE and base station procedures for PUSCH repetitive transmission The number of slots in which the PUSCH is transmitted or the number of repetitions of the PUCCH transmission is, for example, one of a number of predefined values ​​(i.e., 1, 2, 4, 8), and the value set in the actual terminal among the number of values ​​is transmitted by the RRC message. If the number of repetitions of the PUSCH transmission is set to 1, it indicates a general PUSCH rather than a repeated PUSCH.

[0286] In the case of the PUSCH, the PUSCH is transmitted only in a slot configuration suitable for the transmission of the PUSCH among K consecutive slots, and a postponement operation of the PUSCH transmission is not performed.

[0287] The start and length of the symbol in which the PUSCH is transmitted within a slot are indicated by the DIC and are maintained the same for all slots. The UE determines whether to transmit the PUSCH indicated by the DCI. This determination is based on semi-static DL / UL allocation information. The semi-static DL / UL allocation information used for the determination includes at least one of UL-DL configuration common information indicated by RRC signaling and UL-DL configuration specific information additionally indicated to the UE by RRC signaling.

[0288] As an example, the UL-DL configuration shared information indicates a period to which the semi-static DL / UL allocation information is applied, and is used to set a slot format configured as the number of UDL 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, and the number of slots. That is, the terminal configures a slot format for each slot over the number of slots indicated by the UL-DL configuration shared information. As another example, the UL-DL configuration dedicated information includes information for replacing flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. That is, the terminal replaces flexible symbols in the slot format provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration dedicated information.

[0289] In each slot instructed by the base station to transmit a PUSCH, if the symbol in which the PUSCH is transmitted overlaps with the symbol(s) instructed by the semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the instructed symbol(s).

[0290] For example, if at least one of the indicated symbol(s) is a DL symbol, the terminal does not transmit a PUSCH and cancels the transmission of the PUSCH, and if the indicated symbol(s) is a UL symbol(s) and a flexible symbol(s), the terminal transmits a PUSCH in the corresponding slot.

[0291] As another example, if at least one of the indicated symbol(s) is a DL symbol or a flexible symbol(s), the terminal does not transmit a PUSCH and cancels the transmission of the PUSCH, and if the indicated symbol(s) is a UL symbol, the terminal transmits a PUSCH in the corresponding slot.

[0292] If at least one symbol of the symbols in which the PUSCH is transmitted in the first slot among the slots in which the transmission of the repeated PUSCH is assigned overlaps with a DL symbol, the terminal cancels the transmission of the PUSCH without transmitting the PUSCH in the corresponding slot. That is, if the symbol in which the PUSCH is transmitted in the first slot among the slots in which the transmission of the repeated PUSCH is instructed is composed of a UL symbol(s) and a flexible symbol, the terminal transmits the PUSCH in the corresponding slot. Also, if at least one symbol in which the PUSCH is transmitted in the slots after the first slot among the slots in which the transmission of the repeated PUSCH is instructed overlaps with a DL symbol or a flexible symbol, the terminal cancels the transmission of the PUSCH without transmitting the PUSCH in the corresponding slot. That is, if the symbol instructed to transmit the PUSCH in the slots after the first slot among the slots in which the transmission of the repeated PUSCH is instructed is composed of a UL symbol(s), the terminal transmits the PUSCH in the corresponding slot.

[0293] In the following, a method for processing PUSCH regarding gap symbols is disclosed.

[0294] A gap for DL-UL switching exists between DL symbols and UL symbols. The gap is located in a flexible symbol. Some symbol(s) among the flexible symbol(s) between DL symbols and UL symbols are used for DL-UL switching gap and are not used for DL ​​reception or UL transmission. The number of symbols for the gap is G. G may be fixed to a specific value such as 1 or 2, may be configured in the UE by an RRC message, or may be determined via a timing advance value.

[0295] In each slot instructed by the base station to transmit a PUSCH, if the symbol in which the PUSCH is transmitted overlaps with the symbol(s) instructed by the semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the instructed symbol.

[0296] As an example, if all of the indicated symbols are UL symbols, the terminal transmits a PUSCH, and if at least one of the indicated symbol(s) is a DL symbol or G consecutive flexible symbols (s) immediately following a DL symbol, the terminal does not transmit a PUSCH in the corresponding slot.

[0297] That is, in a slot instructed by the base station to transmit a PUSCH, if the symbol on which the PUSCH is transmitted is a UL symbol, the terminal transmits the PUSCH, and if at least one of the symbols on which the PUSCH is transmitted overlaps with a DL symbol or at least one of the G consecutive flexible symbols (s) immediately following the DL symbol, the terminal cancels the PUSCH transmission without transmitting the PUSCH. That is, if the PUSCH overlaps with a DL symbol and any one of the G symbols usable as a gap, the PUSCH transmission is canceled.

[0298] Terminal and base station procedures for repeated reception of PDSCH The number of slots in which the PDSCH is received or the number of repetitions of the PDSCH reception is, for example, one of a number of predefined values ​​(i.e., 1, 2, 4, 8), and the value actually set in the terminal among the number of values ​​is transmitted by an RRC message. If the number of repetitions of the PDSCH reception is set to 1, it indicates a general PDSCH rather than a repeated PDSCH.

[0299] The start and length of the symbol in which the PDSCH is received within a slot are indicated by the DIC and are maintained the same for all slots. The UE determines whether to transmit the PDSCH indicated by the DCI. This determination is based on semi-static DL / UL allocation information. The semi-static DL / UL allocation information used for the determination includes at least one of UL-DL configuration common information indicated by RRC signaling and UL-DL configuration specific information additionally indicated to the UE by RRC signaling.

[0300] As an example, the UL-DL configuration shared information indicates a period to which the semi-static DL / UL allocation information is applied, and is used to set a slot format and the number of slots configured as the number of UDL 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 configures a slot format for each slot over the number of slots indicated by the UL-DL configuration shared information. As another example, the UL-DL configuration dedicated information includes information for replacing flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. That is, the terminal replaces flexible symbols in the slot configuration provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration dedicated information.

[0301] Within a slot instructed by the base station to receive a PDSCH, if the symbol at which the terminal receives the PDSCH overlaps with the symbol(s) indicated by the semi-static UL / DL allocation 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.

[0302] For example, if at least one of the indicated symbol(s) is a UL symbol, the terminal does not receive the PDSCH, whereas if the indicated symbol(s) is a DL symbol(s) and a flexible symbol(s), the terminal receives the PDSCH in the corresponding slot.

[0303] As another example, if at least one of the indicated symbol(s) is a UL symbol or an Unknown (or a flexible symbol(s)), the terminal does not receive the PDSCH. On the other hand, if the indicated symbol(s) is a DL symbol, the terminal receives the PDSCH in the corresponding slot.

[0304] If at least one symbol of the symbols in which the PDSCH is received in the first slot among the slots instructed to receive the repeated PDSCH overlaps with a UL symbol, 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 instructed to receive the repeated PDSCH is composed of DL symbol(s) and flexible symbol, the terminal receives the PDSCH in the corresponding slot. Also, if at least one symbol of the symbols in which the PDSCH is received in the slots after the first slot among the slots instructed to receive the repeated PDSCH overlaps with a UL symbol or flexible symbol, the terminal does not receive the PDSCH in the corresponding slot. That is, if the slot in which the base station instructs to receive the PDSCH and the symbol in the slot instructs to transmit the PDSCH in the slots after the first slot among the slots instructed to receive the repeated PDSCH are composed of DL symbol(s), the terminal receives the PDSCH in the corresponding slot. Meanwhile, the terminal receives the PDSCH that could not be received in the next postponed slot.

[0305] In the following, a method for processing the PDSCH regarding gap symbols is disclosed.

[0306] A gap for DL-UL switching exists between DL symbols and UL symbols. The gap is located in a flexible symbol. Some symbol(s) among the flexible symbol(s) between DL symbols and UL symbols are used for DL-UL switching gap and are not used for DL ​​reception or UL transmission. The number of symbols for the gap is G. G may be fixed to a specific value such as 1 or 2, may be configured in the UE by an RRC message, or may be determined via a timing advance value.

[0307] If the symbol at which the PDSCH is received within a slot instructed by the base station to receive the PDSCH overlaps with the symbol(s) instructed by the semi-static UL / DL allocation 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 instructed symbol.

[0308] As an example, if all of the indicated symbol(s) are DL symbols, the terminal receives a PDSCH, and if at least one of the indicated symbol(s) is a UL symbol or G consecutive flexible symbols immediately preceding a UL symbol, the terminal does not receive a PDSCH.

[0309] That is, if the symbol at which the PDSCH is received is a DL symbol in a slot instructed by the base station to receive the PDSCH, the terminal receives the PDSCH, and if the symbol at which the PDSCH is received overlaps with a UL symbol or at least one of the G consecutive flexible symbols immediately preceding the UL symbol, the terminal does not receive the PDSCH. That is, if the symbol at which the PDSCH is transmitted overlaps with a UL symbol and one of the G symbols that can be used as a gap, the PDSCH is not transmitted and the transmission of the PDSCH is canceled. Then, the base station postpones the transmission of the PDSCH to the next slot.

[0310] On the other hand, if the terminal cancels reception of the PDSCH due to semi-static DL / UL allocation information, the HARQ-ARQ timing may be changed, so a new HARQ-ARQ timing setting method needs to be defined.

[0311] In one aspect, if the reception of a PDSCH is canceled, the new HARQ-ARQ timing is determined by the PDSCH received without being canceled. That is, the terminal uses the HARQ-ACK timing included in the DCI instructing the reception of the PDSCH and the last received PDSCH excluding the canceled PDSCH to determine the slot in which the actual HARQ-ACK is transmitted. For example, a terminal instructed to receive 4 slots as the HARQ-ACK timing transmits the HARQ-ACK 4 slots or later from the slot in which the last PDSCH was received.

[0312] In another aspect, even if the reception of the PDSCH is cancelled, the HARQ-ARQ timing is determined assuming that the PDSCH is received without being changed. That is, the terminal uses the HARQ-ACK timing included in the DCI instructing the reception of the PDSCH and the calculation based on the last PDSCH before deciding whether to cancel, to determine the slot in which the actual HARQ-ACK is transmitted. For example, a terminal instructed to receive 4 slots as the HARQ-ACK timing transmits the HARQ-ACK 4 slots after the last slot of the assigned PDSCH even if the reception of the PDSCH is cancelled.

[0313] Meanwhile, the terminal is configured to perform inter-slot frequency hopping for frequency diversity. Therefore, even if the terminal repeatedly transmits PUCCH (or PDSCH, PUSCH) in multiple slots, a method for the terminal to perform inter-slot frequency hopping needs to be specified. In this embodiment, a physical resource block (PRB) for transmitting PUCCH (or PDSCH, PUSCH) in each slot during inter-slot frequency hopping is disclosed. In addition, this embodiment discloses an algorithm for determining a PRB according to the difference between the current slot and the slot in which PUCCH is initially transmitted, regardless of the number of times PUCCH is repeatedly transmitted.

[0314] In one aspect, the method for inter-slot frequency hopping during PUCCH transmission includes a step in which a terminal determines a resource block (RB) for transmitting a PUCCH according to an index of a first slot and an index of a second slot in which a repeated PUCCH is initially transmitted. s In Equation 7, the RB or the starting RB index of the RB on which the PUCCH is transmitted is obtained.

[0315]

number

[0316] In the formula 7, RB 1 and R.B. 2 are the starting RB indexes of the first hop and the second hop, respectively, and are signaled to the terminal via an RRC message and configured in the terminal. s、0 is the index of the slot in which the PUSCH was first transmitted. In this method, the PUSCH is transmitted through only one hop during repeated transmission due to the postponement of the repeated PUCCH.

[0317] In another aspect, the method of inter-slot frequency hopping during PUCCH transmission includes hopping every time a terminal actually transmits a repeated PUCCH. The RB is determined according to a slot index in which the PUCCH is transmitted and the actual number of repetitions. More specifically, in slot n s In Equation 8, the RB or the starting RB index of the RB on which the PUCCH is transmitted is obtained.

[0318]

number

[0319] In the formula 8, RB 1 and R.B. 2are the starting RB indexes of the first hop and the second hop, respectively, and are signaled to the terminal via an RRC message and configured in the terminal. repeat (n s ) is slot n s This is the number of times that the PUCCH has been repeatedly transmitted up to the present. In this method, the PUCCH is transmitted via two different hops regardless of the postponement of the repeated PUCCH.

[0320] [Still another embodiment] In this specification, further embodiments disclose a method for determining through which slot among a number of slots PUCCH repeated transmission is to be performed, in addition to a method and determination procedure for repeatedly transmitting PUCCH across multiple slots to improve PUCCH coverage.

[0321] Hereinafter, a method for a terminal to determine a slot for PUCCH transmission from among multiple slots will be disclosed.

[0322] In one aspect, the terminal determines a slot for PUCCH transmission based on a synchronization signal for radio resource management (RRM) measurement and an SS / PBCH block including information on initial cell access. The SS / PBCH block may be transmitted at a predetermined position, and a configuration for the transmission of the SS / PBCH block is transmitted from the base station to the terminal via an RRC message (i.e., SSB_transmitted-SIB1 information or SSB_transmitted) and configured in the terminal. In a slot indicated by the configuration for the transmission of the SS / PBCH block, a flexible symbol capable of transmitting the SS / PBCH block exists. That is, the flexible symbol is not only used for transmitting the PUCCH, but also used for transmitting the SS / PBCH block including information on synchronization and initial cell access. In this case, the flexible symbol(s) for transmitting the SS / PBCH block and the flexible symbol(s) for transmitting the PUCCH may at least partially overlap each other.

[0323] For example, the UE determines slots for the repeated PUCCH by excluding slots including the overlapping symbols from slots for the repeated PUCCH transmission to prevent collision. In this manner, the UE determines multiple slots for transmitting the PUCCH based on SSB_transmitted-SIB1 and SSB_transmitted, and repeatedly transmits the PUCCH over the multiple slots, and the base station receives the repeated PUCCH from the UE.

[0324] In another aspect, the UE determines a slot for PUCCH transmission based on semi-static DL / UL allocation information and a gap.

[0325] In the following description, it is assumed that the gap is located at the symbol immediately before the symbol for PUCCH transmission, and that the gap includes one or two symbols. However, the position and number of symbols of the DL-UL switching gap between DL and UL are variously set according to the settings of the base station and the terminal. For example, the gap includes two or more symbols, and the terminal determines the slot for PUCCH transmission or determines whether to postpone PUCCH transmission by considering two or more gap symbols.

[0326] Meanwhile, the slot determination is based on at least one of whether a PDSCH is allocated in the slot, whether a control resource set (CORESET) for PDCCH monitoring is allocated to a DL symbol in the slot, whether a CSI-RS is allocated in the slot, whether an SS / PBCH block is allocated in the slot, and semi-static DL / UL allocation information.

[0327] As an example, to determine a PUCCH transmission resource for a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol(s) and a PDSCH is assigned to the DL symbol(s), the terminal does not consider the flexible symbol as a resource for PUCCH transmission. Instead, the terminal determines a slot including another UL symbol and the flexible symbol(s) as a slot for PUCCH transmission. If the symbol immediately preceding the flexible symbol is a DL symbol(s) and a PDSCH is not assigned to the DL symbol(s), the flexible symbol becomes an unassigned symbol. Thus, the terminal does not consider the unassigned symbol as a gap for DL-UL switching. Then, the terminal considers the flexible symbol immediately following the DL symbol(s) as a resource capable of repeated PUCCH transmission and determines it as a slot for PUCCH transmission.

[0328] As another example, to determine a PUCCH transmission resource for a flexible symbol, if the symbol immediately preceding the flexible symbol is DL symbol(s) and the DL symbol(s) is assigned a CORESET or research space for PDCCH monitoring, the terminal excludes the slot including the flexible symbol from the slots for repeated PUCCH transmission in order to perform the assigned PDCCH monitoring.

[0329] As another example, to determine a PUCCH transmission resource for a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol(s) and a CORESET or search space for PDCCH monitoring is assigned to the DL symbol(s), the terminal does not monitor the assigned PDCCH, but regards the flexible symbol as a resource capable of repeated PUCCH transmission and determines it as a slot for PUCCH transmission.

[0330] As another example, the terminal determines a slot for PUCCH transmission using semi-static DL / UL allocation information. The terminal knows which slot and which symbol the PUCCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUCCH transmission is specified overlaps with a flexible symbol specified by the semi-static DL / UL allocation information, and the symbol immediately before the symbol for which PUCCH transmission is specified is not a DL symbol specified by the semi-static DL / UL allocation information, the terminal determines the corresponding slot as a slot for repeated PUCCH transmission and transmits the PUCCH in the corresponding slot. On the other hand, if the symbol immediately before the symbol for which the PUCCH is transmitted is a DL symbol specified by the semi-static DL / UL allocation information, the terminal does not transmit repeated PUCCH in the corresponding slot, but postpones PUCCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUCCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol in which the PUCCH is transmitted is the DL symbol of the semi-static DL / UL allocation information, the terminal does not transmit the PUCCH in the corresponding slot, otherwise the terminal transmits the PUCCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUCCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0331] As another example, the terminal determines a slot for PUCCH transmission using information scheduled to the terminal. The terminal knows which slot and which symbol the PUCCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUCCH transmission is specified overlaps with a flexible symbol specified by the semi-static DL / UL allocation information, and if a PDSCH is not scheduled in the symbol immediately before the symbol for which PUCCH transmission is specified, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits the PUCCH in the corresponding slot. On the other hand, if a PDSCH is scheduled in the symbol immediately before the symbol for which the PUCCH is transmitted, the terminal does not transmit the PUCCH in the corresponding slot, but postpones the PUCCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUCCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if a PDSCH is scheduled in the symbol immediately before the symbol in which the PUCCH is transmitted, the terminal does not transmit the PUCCH in the corresponding slot, otherwise the terminal transmits the PUCCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUCCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0332] As another example, the terminal determines a slot for PUCCH transmission using CSI-RS information configured in the terminal. The terminal knows which slot and which symbol the PUCCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which PUCCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and CSI-RS reception is not configured in the symbol immediately before the symbol for which PUCCH transmission is specified, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits PUCCH in the corresponding slot. On the other hand, if CSI-RS reception is configured in the symbol immediately before the symbol for which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot, and postpones PUCCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUCCH is transmitted for each slot from the RRC message and / or dynamic signaling (e.g., PRIPRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol in which the PUCCH is transmitted is configured for CSI-RS reception, the terminal does not transmit the PUCCH in the corresponding slot, otherwise the terminal transmits the PUCCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUCCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0333] As another example, the terminal determines a slot for PUCCH transmission using PDCCH monitoring information configured in the terminal. The terminal knows which slot and which symbol the PUCCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUCCH transmission is specified overlaps with a flexible symbol in the semi-static DL / UL allocation information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately before the symbol for which PUCCH transmission is specified, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits PUCCH in the corresponding slot. On the other hand, if PDCCH monitoring is configured (or assigned) in the symbol immediately before the symbol for which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot, and postpones PUCCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUCCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if PDCCH monitoring is configured for the symbol immediately before the symbol in which the PUCCH is transmitted, the terminal does not transmit the PUCCH in the corresponding slot, otherwise the terminal transmits the PUCCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUCCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0334] As another example, the terminal knows which slot and which symbol the PUCCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which PUCCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and the symbol immediately before the symbol for which PUCCH transmission is specified does not overlap with an SS / PBCH block, the terminal determines the corresponding slot as a slot for PUCCH transmission and transmits the PUCCH in the corresponding slot. On the other hand, if the symbol immediately before the symbol for which the PUCCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUCCH in the corresponding slot, and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUCCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or the symbol immediately before the symbol in which the PUCCH is transmitted overlaps with the SS / PBCH block, the terminal does not transmit the PUCCH in the corresponding slot, otherwise the terminal transmits the PUCCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUCCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0335] In one embodiment of the present invention, since the DL-UL switching gap between DL and UL is set variously depending on the settings of the base station and the terminal, in this invention, when considering the symbol immediately preceding the symbol for transmitting the PUCCH, the transmission and postponement of the PUCCH is mainly described by taking as an example at least one symbol. However, since the DL-UL switching gap is set variously depending on the settings of the base station and the terminal, the number of corresponding symbols is various, and for example, the transmission and postponement of the PUCCH may be determined by considering one or more symbols.

[0336] In this embodiment, if the symbol indicated by the DL symbol by dynamic signaling (Dynamic SFI) in one slot ends at the symbol immediately before the symbol for the repeated PUCCH transmission and the PUCCH resource is set so that the transmission for the repeated PUCCH is performed from the next symbol, the terminal does not transmit the PUCCH in that slot but postpones it to a subsequent slot. The postponed slot is the earliest slot among the slots in which the PUCCH is transmitted.

[0337] Hereinafter, a method in which a UE determines a slot for PUCCH transmission depending on whether a PDSCH is allocated within a slot will be described with a more detailed example. Here, it is assumed that one slot includes 14 symbols.

[0338] For example, assume that the UL symbol resource for PUCCH is set to the last 12 symbols, and a specific slot includes two DL symbols, two flexible symbols, and 10 UL symbols in sequence. If the PDSCH is assigned to the 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. Then, the terminal determines whether the remaining one flexible symbol and 10 UL symbols other than the first flexible symbol can be selected as PUCCH resources. However, since the UL symbol resource for PUCCH is set to the last 12 symbols of the slot, the terminal excludes the slot from slot resources for PUCCH transmission. In the above example, if the UL symbol resource for PUCCH is set to the last 11 symbols of the slot, the terminal determines the slot as a slot resource for PUCCH transmission. Also, for example, assume that the UL symbol resource for PUCCH is configured with the last 6 symbols, and a specific slot includes 8 DL symbols, 2 flexible symbols, and 4 UL symbols in sequence. If the first 8 DL symbols are assigned with PDSCH, the terminal implicitly regards the first flexible symbol as a switching gap between DL and UL. Then, the terminal determines whether the remaining one flexible symbol and 4 UL symbols, excluding the first flexible symbol, can be selected as PUCCH resources. However, since the UL symbol resource for PUCCH is configured with the last 6 symbols of the slot, the terminal excludes the slot from slot resources for PUCCH transmission. In the above example, if the UL symbol resource for PUCCH is configured with the last 5 symbols of the slot, the terminal determines the slot as a slot resource for PUCCH transmission.

[0339] [Still another embodiment] In this specification, further embodiments disclose a method for determining through which slot among a number of slots the PUSCH is to be repeatedly transmitted, in addition to a method and a determination procedure for repeatedly transmitting the PUSCH over multiple slots in order to improve the coverage of the PUSCH.

[0340] Meanwhile, the slot for transmitting the PUSCH is determined based on at least one of whether a PDSCH is allocated in the slot, whether a control resource set for PDCCH monitoring is allocated to a DL symbol in the slot, whether a CSI-RS is allocated in the slot, whether an SS / PBCH block is allocated in the slot, and semi-static DL / UL allocation information.

[0341] As an example, the UE determines a slot for PUSCH transmission using semi-static DL / UL allocation information. The UE knows which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If the symbol for which PUSCH transmission is specified overlaps with the flexible symbol specified by the semi-static DL / UL allocation information and the symbol immediately before the symbol for which PUSCH transmission is specified is not the DL symbol specified by the semi-static DL / UL allocation information, the UE determines the corresponding slot as a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if the symbol immediately before the symbol for which PUSCH is transmitted is the DL symbol specified by the semi-static DL / UL allocation information, the UE does not transmit PUSCH in the corresponding slot and postpones PUSCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol in which the PUSCH is transmitted is the DL symbol of the semi-static DL / UL allocation information, the terminal does not transmit the PUSCH in the corresponding slot, otherwise the terminal transmits the PUSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0342] As another example, the terminal determines a slot for PUSCH transmission using information scheduled to the terminal. The terminal knows which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which PUSCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and if a PDSCH is not scheduled in the symbol immediately before the symbol for which PUSCH transmission is specified, the terminal determines the corresponding slot as a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if a PDSCH is scheduled in the symbol immediately before the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot and postpones PUSCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PUSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if a PDSCH is scheduled in the symbol immediately before the symbol in which the PUSCH is transmitted, the terminal does not transmit the PUSCH in the corresponding slot, otherwise the terminal transmits the PUSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0343] As another example, the terminal determines a slot for PUSCH transmission using CSI-RS information configured in the terminal. The terminal knows which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUSCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and CSI-RS reception is not configured in the symbol immediately before the symbol for which PUSCH transmission is specified, the terminal determines the corresponding slot as a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if CSI-RS reception is configured in the symbol immediately before the symbol for which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot. In other words, the UE knows the symbols in which the PUSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol in which the PUSCH is transmitted is configured for CSI-RS reception, the UE does not transmit the PUSCH in the corresponding slot, otherwise the UE transmits the PUSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0344] As another example, the terminal determines a slot for PUSCH transmission using PDCCH monitoring information configured in the terminal. The terminal knows which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUSCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately before the symbol for which PUSCH transmission is specified, the terminal determines the corresponding slot as a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if PDCCH monitoring is configured (or assigned) in the symbol immediately before the symbol for which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot. In other words, the terminal knows the symbols in which the PUSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if PDCCH monitoring is configured for the symbol immediately before the symbol in which the PUSCH is transmitted, the terminal does not transmit the PUSCH in the corresponding slot, otherwise the terminal transmits the PUSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0345] As another example, the terminal knows which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which PUSCH transmission is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and the symbol immediately before the symbol for which PUSCH transmission is specified does not overlap with an SS / PBCH block, the terminal determines the corresponding slot as a slot for PUSCH transmission and transmits the PUSCH in the corresponding slot. On the other hand, if the symbol immediately before the symbol for which PUSCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUSCH in the corresponding slot. In other words, the terminal knows the symbols in which the PUSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation 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 corresponding slot, otherwise the terminal transmits the PUSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PUSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0346] In one embodiment of the present invention, since the DL-UL switching gap between DL and UL is set variously depending on the settings of the base station and the terminal, in this invention, when considering the symbol immediately before the symbol for transmitting the PUSCH, the transmission and postponement of the PUSCH is mainly described by taking as an example at least one symbol. However, since the DL-UL switching gap is set variously depending on the settings of the base station and the terminal, the number of corresponding symbols is various, and for example, the transmission and postponement of the PUSCH may be determined by considering one or more symbols.

[0347] [Still another embodiment] In this specification, further embodiments disclose a method for determining through which slot among a number of slots the PDSCH is to be repeatedly transmitted, in addition to a method and a determination procedure for repeatedly transmitting the PDSCH over multiple slots to improve the coverage of the PDSCH.

[0348] Meanwhile, the slot for receiving the PDSCH is determined based on at least one of whether a PUSCH, a PUCCH, an SRS transmission, a PRACH transmission, or a semi-static DL / UL allocation information is allocated within the slot.

[0349] As an example, the terminal determines a slot for receiving the PDSCH using semi-static DL / UL allocation information. The terminal knows which slot and which symbol the PDSCH should be received in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which the PDSCH is to be received overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information, and the symbol immediately following the symbol for which the PDSCH is to be received is not a UL symbol indicated by the semi-static DL / UL allocation information, the terminal determines the corresponding slot as a slot for receiving the PDSCH and receives the PDSCH in the corresponding slot. On the other hand, if the symbol immediately following the symbol for which the PDSCH is to be received is a UL symbol indicated by the semi-static DL / UL allocation information, the terminal does not receive the PDSCH in the corresponding slot. In other words, the terminal knows the symbols on which the PDSCH is received for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with a UL symbol of semi-static DL / UL allocation information or if the symbol immediately following the symbol on which the PDSCH is transmitted is a UL symbol of semi-static DL / UL allocation information, the terminal does not receive the PDSCH in the corresponding slot; otherwise, the terminal receives the PDSCH in the corresponding slot.

[0350] As another example, the terminal determines a slot for receiving the PDSCH using uplink information (PUSCH, PUCCH, PRACH, SRS, etc.) scheduled to the terminal. The terminal knows which slot and which symbol the PDSCH should be received at through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which the PDSCH is to be received overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information, and if the PUSCH, PUCCH, PRACH, or SRS is not scheduled at the symbol immediately following the symbol for which the PDSCH is to be received, the terminal determines the corresponding slot as a slot for receiving the PDSCH and receives the PDSCH at the corresponding slot. On the other hand, if the PUSCH, PUCCH, PRACH, or SRS is scheduled at the symbol immediately following the symbol at which the PDSCH is received, the terminal does not receive the PDSCH at the corresponding slot. In other words, the terminal knows the symbols in which the PDSCH is received for each slot from the RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the UL symbol of the semi-static DL / UL allocation information or if a PUSCH, PUCCH, PRACH, or SRS is scheduled in the symbol immediately following the symbol in which the PDSCH is transmitted, the terminal does not receive the PDSCH in the corresponding slot, otherwise the terminal receives the PDSCH in the corresponding slot. Here, the PUCCH is a PUCCH that transmits a HARQ-ACK. Alternatively, the PUCCH may be a PUCCH that transmits a scheduling request (SR).

[0351] As another example, the terminal determines a slot for PDSCH transmission using CSI-RS information configured in the terminal. The terminal knows which slot and which symbol the PDSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one of the symbols for which PDSCH reception is specified overlaps with a flexible symbol specified in the semi-static DL / UL allocation information, and CSI-RS reception is not configured in the symbol immediately before the symbol for which PDSCH reception is specified, the terminal determines the corresponding slot as a slot for PDSCH transmission and transmits PDSCH in the corresponding slot. On the other hand, if CSI-RS reception is configured in the symbol immediately before the symbol for which PDCCH is transmitted, the terminal does not transmit PDSCH in the corresponding slot and postpones PDSCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PDSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol in which the PDSCH is transmitted is configured for CSI-RS reception, the terminal does not transmit the PDSCH in the corresponding slot, otherwise the terminal transmits the PDSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PDSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0352] As another example, the terminal determines a slot for PDSCH transmission using PDCCH monitoring information configured in the terminal. The terminal knows which slot and which symbol the PDSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which reception of the PDSCH is indicated overlaps with a flexible symbol indicated in the semi-static DL / UL allocation information, and PDCCH monitoring is not configured (or assigned) in the symbol immediately before the symbol in which the PDSCH is transmitted, the terminal determines the corresponding slot as a slot for PDSCH transmission and transmits the PDSCH in the corresponding slot. On the other hand, if PDCCH monitoring is configured (or assigned) in the symbol immediately before the symbol in which the PDSCH is transmitted, the terminal does not transmit the PDSCH in the corresponding slot, and postpones the PDSCH transmission to the next available slot. In other words, the terminal knows the symbols in which the PDSCH is transmitted for each slot from an RRC message and / or dynamic signaling (e.g., PRI), and if at least one of the symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or if PDCCH monitoring is configured for the symbol immediately before the symbol in which the PDSCH is transmitted, the terminal does not transmit the PDSCH in the corresponding slot, otherwise the terminal transmits the PDSCH in the corresponding slot. This is because a switching gap between DL and UL is required. The PDSCH that could not be transmitted here is postponed to be transmitted in the next available slot.

[0353] As yet another example, the SS / PBCH block is configured to overlap with the DL symbol, flexible symbol, and UL symbol of the semi-static DL / UL allocation information for the terminal. In this case, the terminal regards the symbol overlapping with the SS / PBCH block as a semi-static DL symbol. That is, if a semi-static DL symbol is configured for the terminal and an SS / PBCH block overlaps with the symbol, the terminal assumes that the symbol is configured as a semi-static DL symbol. Additionally, if the symbol immediately following the symbol overlapping with the SS / PBCH block is a semi-static UL symbol, the terminal assumes that the semi-static UL symbol is a semi-static flexible symbol.

[0354] In one embodiment of the present invention, since the DL-UL switching gap between DL and UL is set variously depending on the settings of the base station and the terminal, in this invention, when considering the symbol immediately following the symbol for transmitting the PDSCH, the transmission and postponement of the PDSCH is mainly described by taking as an example at least one symbol. However, since the DL-UL switching gap is set variously depending on the settings of the base station and the terminal, the number of corresponding symbols is various, and for example, the transmission and postponement of the PDSCH may be determined by considering one or more symbols.

[0355] [Still another embodiment] Yet another embodiment of the present specification relates to a situation where the interval between DL symbols for which downlink reception is required and UL symbols for which uplink transmission is required is not sufficient, and the terminal is unable to perform downlink reception and uplink transmission. At least a DL-UL switching gap is required between the downlink reception and uplink transmission of the terminal. Here, the DL-UL switching gap may be mixed with a switching gap or simply a gap, which are different in expression and have the same meaning.

[0356] 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 less (hereinafter referred to as frequency range (FR1)1), the DL-UL switching gap needs to be 13 us. Or, when the carrier frequency is 6 GHz or more (hereinafter referred to as FR2), the DL-UL switching gap needs to be 7 us.

[0357] The DL-UL switching gap is also affected by the timing advance (TA) value and the TA offset value. The DL-UL switching gap is also affected by the subcarrier spacing. That is, the DL-UL switching gap is determined based on the TA value, the TA offset value, and / or the subcarrier spacing. For example, if one symbol duration is Xus, the number of symbols (G) required in the DL-UL switching gap is given by G=ceil((Rx2Tx+Ta+TA_offset) / X). ​​Here, Rx2Tx may have different values ​​depending on the carrier frequency. For example, when the carrier frequency is 6GHz or less (FR1), Rx2Tx is 13us, and when the carrier frequency is 6GHz or more (FR2), Rx2Tx is 7us. TA is the maximum value among the TA values ​​configured by the terminal from the base station or the TA values ​​that the terminal can configure in the base station. TA_offset is 39936*Tc or 25600*Tc in FR1 and 13792*Tc in FR2, where Tc=1 / (480*103*4096), where the switching gap is the RF interruption time.

[0358] Table 5 shows an example of the number of symbols required for a DL-UL switching gap depending on the subcarrier spacing.

[0359] [Table 5]

[0360] Table 6 shows another example of the number of symbols required for a DL-UL switching gap according to subcarrier spacing.

[0361] [Table 6]

[0362] Hereinafter, a method for processing an uplink channel or an uplink signal based on a downlink signal received by a terminal and a DL-UL switching gap (G) will be disclosed. In this embodiment, the downlink signal includes an SS / PBCH block, a PDSCH, a PDCCH, a periodic signal, a measurement signal, etc. In addition, in this embodiment, the uplink channel includes a PUSCH, a PUCCH, a PRACH, etc., and the uplink signal includes an SRS, a periodic signal, a measurement signal, etc.

[0363] Symbols for SS / PBCH block transmission and uplink transmission In one aspect, a method for processing uplink transmission by a terminal includes determining whether at least one of symbols for which transmission of an uplink channel or an uplink signal is instructed is set to overlap (i.e., conflict) with a symbol for which an SS / PBCH block is instructed to be received from a base station (or a symbol for transmitting an SS / PBCH block), and transmitting an uplink channel or an uplink signal based on the determination. Here, if at least a portion of the symbols for which an SS / PBCH block is received is set to overlap with transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0364] In another aspect, a method for processing uplink transmission by a terminal includes determining whether at least one of symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a symbol(s) to which an SS / PBCH block instructed to receive from a base station is assigned, and transmitting an uplink channel or an uplink signal based on the determination, where if at least a portion of the G symbol(s) is set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0365] Symbols for downlink transmission and uplink transmission In another aspect, a method for processing uplink transmission by a terminal includes determining whether at least one symbol among symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a symbol instructed to receive a downlink transmission from a base station (or a symbol for downlink transmission), and transmitting an uplink channel or an uplink signal based on the determination. Here, if at least a portion of the symbols instructed to receive an uplink transmission are set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0366] In yet another aspect, a method for processing uplink transmission by a terminal includes determining whether at least one of symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a G symbol(s) following a symbol(s) instructed to receive a downlink transmission from a base station, and transmitting an uplink channel or an uplink signal based on the determination, where if at least a portion of the G symbol(s) is set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0367] Meanwhile, this embodiment includes a step in which the base station performs scheduling (iG Layer 1 (L1) dynamic scheduling) so that symbols for downlink transmission and symbols for uplink transmission do not overlap. That is, when the base station performs scheduling for the terminal, it sets uplink transmission based on the G symbol. In this case, the terminal does not expect the base station to set uplink transmission of the terminal within the G symbol.

[0368] In addition, this embodiment includes a step of the terminal determining whether a G symbol overlaps with the uplink transmission configured by RRC when an uplink transmission based on RRC other than L1 dynamic scheduling is set, and a step of the terminal transmitting or not transmitting an uplink channel or signal based on the determination.

[0369] Hereinafter, a method for a terminal to process downlink reception and transmission of uplink channels (or uplink signals) based on a DL-UL switching gap (G) is disclosed. In this embodiment, the downlink signals include SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. In addition, in this embodiment, the uplink channels include PUSCH, PUCCH, PRACH, etc., and the uplink signals include SRS, etc.

[0370] Processing of downlink signals depending on whether flexible symbols and uplink signals can be superimposed The UE may or may not receive a downlink signal (i.e., a downlink periodic signal or a measurement signal) configured by a UE-specific RRC message with a symbol configured as a flexible symbol according to semi-static DL / UL allocation information or with a symbol not configured by semi-static DL / UL allocation information. In this case, the manner in which the UE processes the configured downlink reception is based on the alignment relationship (e.g., overlapping relationship) between the DL-UL switching gap and the uplink signal.

[0371] In one aspect, a method for processing the configured downlink reception by a terminal includes the steps of: determining whether the terminal is configured to transmit 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, if the determination result shows that the configured downlink signal does not overlap with an uplink signal within G symbols after the last symbol of the configured downlink signal, the terminal receives the configured downlink signal. Conversely, if the configured downlink signal overlaps with an uplink signal within G symbols, the terminal does not receive the configured downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information in one slot and the first symbol assigned in the uplink signal, the terminal drops the downlink signal.

[0372] Here, the uplink signal includes an uplink signal configured by a cell-specific RRC message, for example, the uplink signal configured by a cell-specific RRC message includes a PRACH.

[0373] Alternatively, the uplink signal includes an uplink signal indicated by the L1 signaling. As an example, the uplink signal indicated by the L1 signaling includes a PUSCH scheduled in DCI format 0_0 or 0_1. As another example, the uplink signal indicated by the L1 signaling includes a PUCCH including a HARQ-ACK response to a PUSCH scheduled in DCI format 1_0 or 1_1. As yet another example, the uplink signal indicated by the L1 signaling includes an SRS signal indicated by the DCI. As yet another example, the uplink signal indicated by the L1 signaling includes a first transmission of uplink semi-persistent scheduled (SPS) PDSCH transmissions indicated by the DCI scrambled with the CS-RNTI.

[0374] Also, the downlink signal includes a CSI-RS configured by a terminal-specific RRC message. As an example, the downlink signal includes a CORESET for PDCCH monitoring configured by a terminal-specific RRC message. As another example, the downlink signal includes a downlink SPS PDSCH transmission (except for the first transmission) scrambled with a CS-RNTI.

[0375] In another aspect, the method of processing the downlink reception by a terminal includes the steps of: determining whether a UL symbol configured according to semi-static DL / UL allocation information overlaps within G symbols after the last symbol of the downlink signal; and receiving the downlink signal based on the determination. If the determination result shows that a UL symbol configured according to semi-static DL / UL allocation information overlaps within the G symbols, the terminal does not receive the downlink signal; otherwise, the terminal receives the downlink signal. In other words, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information in one slot and the first symbol assigned in the uplink signal, the terminal drops the downlink signal.

[0376] In another aspect, a method for processing the configured downlink reception by a terminal includes the steps of: determining whether the UE overlaps with a UL symbol indicated by a dynamic SFI within G symbols after the last symbol of the configured downlink signal; and receiving the configured downlink signal based on the determination. If the determination result indicates that the UE overlaps with a UL symbol indicated by a dynamic SFI within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives a downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information in one slot and the first symbol assigned in the uplink signal, the terminal drops the downlink signal.

[0377] In yet another aspect, a method for processing the configured downlink reception by a terminal includes the steps of: determining whether a UL symbol configured according to semi-static DL / UL allocation information overlaps within G symbols (or symbols) before a first symbol of an uplink signal; and receiving the configured downlink signal by the terminal based on the determination. If the determination result indicates that a DL symbol configured according to semi-static DL / UL allocation information overlaps within the G symbols (or symbols), the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. In other words, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information in one slot and the first symbol assigned in the uplink signal, the terminal drops the downlink signal.

[0378] In yet another aspect, a method for processing the configured downlink reception by a terminal includes the steps of: determining whether a DL symbol indicated by a dynamic SFI overlaps within G symbols (or symbols) before a first symbol of an uplink signal; and receiving the configured downlink signal by the terminal based on the determination. If the determination result indicates that a DL symbol indicated by a dynamic SFI overlaps within the G symbols (or symbols), the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. In other words, if there are not at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information in one slot and the first symbol assigned in the uplink signal, the terminal drops the downlink signal.

[0379] Here, the method of processing uplink transmission by the terminal includes an operation in which the terminal does not expect an uplink signal to be configured or indicated by an L1 signal within G symbols following a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message, for a symbol configured as a flexible symbol according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information.

[0380] Processing of uplink signals depending on whether flexible symbols and downlink signals can be superimposed The UE may transmit or may not transmit an uplink signal (i.e., uplink periodic signal or measurement signal) configured by a UE-specific RRC message with a symbol configured as a flexible symbol according to semi-static DL / UL allocation information or with a symbol not configured by semi-static DL / UL allocation information. In this case, the UE determines how to process the configured uplink transmission based on the arrangement relationship (e.g., overlapping relationship) between the DL-UL switching gap and the uplink signal.

[0381] In one aspect, a method for processing the configured uplink transmission by a terminal includes transmitting the configured uplink signal based on whether the terminal receives a downlink signal within G symbols before the last symbol of the configured uplink signal. That is, if there is no overlap with a downlink signal within G symbols before the first symbol of the configured uplink signal, the terminal transmits the configured uplink signal. Conversely, if there is an overlap with a downlink signal within G symbols, the terminal does not transmit the configured uplink signal. That is, if there are not at least G gap symbols between the first DL symbol configured according to semi-static DL / UL allocation information in one slot and the last symbol assigned in the downlink signal, the terminal drops the uplink signal.

[0382] Here, the downlink signal includes a downlink signal configured by a cell-specific RRC message. For example, the downlink signal configured by the cell-specific RRC message includes an SS / PBCH block. For another example, the downlink signal configured by the cell-specific RRC message includes a type-0 common search space. Here, the type-0 common search space is a search space for receiving remaining minimum scheduling informaiton (RMSI). For another example, the downlink signal configured by the cell-specific RRC message includes 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 process.

[0383] Alternatively, the downlink signal includes a downlink signal indicated by the L1 signaling. As an example, the uplink signal indicated by the L1 signaling includes a PDSCH scheduled in DCI format 1_0 or 1_1. As another example, the uplink signal indicated by the L1 signaling includes an aperiodic CSI-RS indicated by the DCI. As yet another example, the uplink signal indicated by the L1 signaling includes a first transmission of uplink SPS PDSCH transmissions indicated by the DCI scrambled with the CS-RNTI.

[0384] Also, the uplink signal includes an SRS configured by a terminal-specific RRC message. For example, the uplink signal includes a periodic PUCCH and PUSCH configured by a terminal-specific RRC message. For another example, the uplink signal includes an SR configured by a terminal-specific RRC message.

[0385] In another aspect, a method for processing the configured uplink transmission by a terminal includes determining whether a UL symbol configured according to semi-static DL / UL allocation information overlaps within G symbols before a first symbol of the configured uplink signal, and transmitting the configured uplink signal by the terminal based on the determination. If the determination result indicates that there is no overlap with a DL symbol configured according to semi-static DL / UL allocation information within the 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 not at least G gap symbols between the first DL symbol configured according to semi-static DL / UL allocation information and the last symbol assigned in a downlink signal within one slot, the terminal drops the uplink signal.

[0386] Here, the method of processing downlink reception by the terminal includes an operation in which the terminal does not expect a downlink signal to be configured or instructed by L1 signaling during G symbols following a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message, for a symbol configured as a flexible symbol according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information.

[0387] In a case where 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 smaller than G for a symbol configured as a flexible symbol according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, the operation of the terminal is as follows.

[0388] As an example, the terminal receives downlink signals configured by a cell-specific RRC message, but does not transmit uplink signals configured by a cell-specific RRC message or indicated by L1 signaling.

[0389] As another example, the terminal transmits uplink signals configured by a cell-specific RRC message and does not receive downlink signals configured by a cell-specific RRC message or indicated by L1 signaling.

[0390] As another example, the terminal operates according to L1 signaling. That is, if the L1 signaling indicates downlink reception and the cell-specific RRC message configures uplink transmission, the terminal performs downlink reception but does not perform uplink transmission. Conversely, if the L1 signaling indicates uplink reception and the cell-specific RRC message configures downlink transmission, the terminal performs uplink transmission but does not perform downlink reception.

[0391] FIG. 17 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention. In an embodiment of the present invention, the terminal is embodied as various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal is referred to as User Equipment (UE), Station (STA), Mobile Subscriber (MS), etc. In addition, in an embodiment of the present invention, the base station controls and manages cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area, and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station is referred to as next generation NodeB (gNB) or Access Point (AP), etc.

[0392] As shown, the terminal 100 according to an embodiment of the present invention includes a processor 110, a communication unit 120, a memory 130, a user interface unit 140, and a display unit 150. The terminal 100 is a terminal as described in the embodiments of the present specification, and performs operations and procedures according to each embodiment of the present specification. In particular, the communication module 120 performs an operation of the terminal transmitting or receiving an object according to each embodiment of the present specification, and the processor 110 performs operations such as generating, judging, and determining other objects.

[0393] First, the processor 110 executes various commands or programs to process data within the terminal 100. The processor 1100 also controls the overall operation of the terminal 100 including each unit, and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 110 receives slot configuration information, determines the slot configuration based thereon, and performs communication according to the determined slot configuration.

[0394] Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. In the drawings, the communication module 120 is illustrated as an integrated module, but each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0395] The cellular communication interface card 121 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides a cellular communication service in a first frequency band based on instructions from the processor 110. According to an embodiment, the cellular communication interface card 121 includes at least one NIC module that utilizes a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 121 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of the frequency band below 6 GHz supported by the corresponding NIC module.

[0396] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides a cellular communication service in the second frequency band based on instructions from the processor 110. According to an embodiment, the cellular communication interface card 122 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. The at least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the corresponding NIC module.

[0397] The unlicensed band communication interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, the external device, and the server through the third frequency band, which is an unlicensed band, and provides communication services of the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 performs wireless communication with at least one of the base station 200, the external device, and the server, independently or dependently, according to the unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0398] Next, the memory 130 stores a control program and various data associated therewith used by the terminal 100. Such a control program includes a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0399] Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. Also, the user interface 140 performs output based on a command from the processor 110 using various output means.

[0400] Then, the display unit 150 outputs various images on a display screen. The display unit 150 outputs various display objects, such as a user interface, based on the contents executed by the processor 110 or the control instructions of the processor 110.

[0401] Also, the base station 200 according to the embodiment of the present invention includes a processor 210, a communication module 220, and a memory 230. The base station 200 is a base station described in each embodiment of the present specification, and performs base station operations and procedures corresponding to terminal operations and procedures according to each embodiment of the present specification. In particular, the communication module 220 performs an operation of the base station receiving or transmitting an object according to each embodiment of the present specification, and the processor 210 performs operations such as generating, judging, and deciding other objects.

[0402] First, the processor 210 executes various commands or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200 including each unit, and controls transmission and reception of data between the units. Here, the processor 210 is configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

[0403] Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either built-in or external. In the drawings, the communication module 220 is illustrated as an integrated module, but the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0404] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, the external device, and the server via a mobile communication network, and provides a cellular communication service in a first frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 221 includes at least one NIC module that utilizes a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol of the frequency band below 6 GHz supported by the corresponding NIC module.

[0405] The cellular communication interface card 222 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server via a mobile communication network, and provides a cellular communication service in the second frequency band based on instructions from the processor 210. According to an embodiment, the cellular communication interface card 222 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. The at least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the corresponding NIC module.

[0406] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server through the third frequency band, which is an unlicensed band, and provides communication services of the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 performs wireless communication with at least one of the terminal 100, an external device, and a server, independently or dependently, according to an unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0407] The terminal 100 and base station 200 shown in FIG. 17 are block diagrams according to an embodiment of the present invention, and the separate blocks are used to logically distinguish between elements of the devices. Thus, the above-mentioned device elements may be implemented in one chip or multiple chips depending on the design of the device. Also, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as necessary.

[0408] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the above-described embodiments are illustrative and limiting in all respects. For example, each component described as a single type may be implemented in a distributed form, and each component described as a distributed form may be implemented in a combined form.

[0409] The scope of the present invention is indicated by the claims set forth below rather than by the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0410] 110 Processor 121 Cellular communication interface card (first frequency band) 122 Cellular communication interface card (second frequency band) 123 Unlicensed spectrum communications interface card (third frequency band) 130 Memory 140 User Interface 150 display units 210 Processor 221 Cellular communication interface card (first frequency band) 222 Cellular communication interface card (second frequency band) 223 Unlicensed spectrum communications interface card (third frequency band) 230 Memory

Claims

1. In a terminal that performs uplink transmission and downlink reception in a wireless communication system, a communication module configured to transmit uplink wireless signals to a base station or receive downlink wireless signals from the base station; a processor configured to determine whether transmission of an uplink radio signal or reception of a downlink radio signal is valid in a slot configured with at least one downlink symbol for downlink transmission, a flexible symbol, or an uplink symbol for uplink transmission, and to transmit the uplink radio signal or receive the downlink radio signal based on the determination.

2. 2. The terminal of claim 1, wherein, in the slot, if a first symbol among the symbols to which the uplink radio signal is assigned starts a predetermined number of symbols after the downlink symbol or a last symbol among the symbols assigned for receiving the downlink radio signal, the processor transmits the uplink radio signal.

3. 2. The terminal of claim 1, wherein, in the slot, if a first symbol among the symbols to which the uplink radio signal is assigned overlaps with at least one of the downlink symbol, a symbol assigned for receiving the downlink radio signal, or a predetermined number of symbols following the last symbol of the symbols, the processor does not transmit the uplink radio signal.

4. The terminal according to claim 2 or 3, wherein 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).

5. The terminal according to claim 2 or 3, wherein at least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

6. The terminal of claim 3, wherein the downlink radio signal includes 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).

7. the non-transmitted uplink radio signal is a physical uplink control channel; The terminal of claim 3, wherein the processor converts the physical uplink control channel into another type of physical uplink control channel that is valid for transmission in the slot and transmits it, or transmits it in the earliest slot among slots that are valid for transmission after the slot.

8. 2. The terminal of claim 1, wherein, if a last symbol among symbols to which a downlink radio signal is assigned in the slot ends a predetermined number of symbols before a first symbol among the uplink symbols or symbols assigned for transmitting the uplink radio signal, the processor receives the downlink radio signal.

9. 2. The terminal of claim 1, wherein, in the slot, if a last symbol among symbols to which a downlink radio signal is assigned overlaps with at least one of the uplink symbol, a symbol assigned for transmitting the uplink radio signal, or a predetermined number of symbols preceding the first symbol of the symbol, the processor does not receive the downlink radio signal.

10. The terminal according to claim 8 or 9, wherein the downlink radio signal includes at least one of a physical downlink shared channel, a physical downlink control channel, or a CSI-RS.

11. The terminal according to claim 8 or 9, wherein at least one of the symbols to which the downlink radio signal is assigned is a flexible symbol.

12. The terminal according to claim 9, wherein the uplink radio signal is a physical random access channel.

13. The slot is configured according to slot configuration information provided by the base station, The terminal according to claim 1, characterized in that the information regarding the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a UE-specific RRC message, or dynamic slot format information generated in a physical layer.

14. A method for performing uplink transmission and downlink reception by a terminal in a wireless communication system, comprising: determining whether transmission of an uplink radio signal assigned to a terminal or reception of the downlink radio signal is valid in a slot including at least one downlink symbol for downlink transmission, a flexible symbol, and an uplink symbol for uplink transmission; and transmitting the uplink radio signal or receiving the downlink radio signal based on the determination.

15. 15. The method of claim 14, wherein the uplink radio signal is transmitted when a first symbol among the symbols to which the uplink radio signal is assigned in the slot starts a predetermined number of symbols after the downlink symbol or a last symbol among the symbols assigned for receiving the downlink radio signal.

16. 15. The method of claim 14, wherein, in the slot, if a first symbol among the symbols to which the uplink radio signal is assigned overlaps with at least one of the downlink symbol, a symbol assigned for receiving the downlink radio signal, or a predetermined number of symbols following the last symbol of the symbols, transmission of the uplink radio signal is not performed.

17. The method according to claim 15 or 16, wherein 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 an SRS.

18. The method according to claim 15 or 16, wherein at least one of the symbols to which the uplink radio signal is assigned is a flexible symbol.

19. The method of claim 16, wherein the downlink radio signal includes at least one of an SS / PBCH block, a physical downlink shared channel, a physical downlink control channel, or a CSI-RS.

20. the non-transmitted uplink radio signal is a physical uplink control channel; The method according to claim 16, characterized in that the physical uplink control channel is converted into another type of physical uplink control channel that is valid for transmission in the slot and then transmitted, or is transmitted in the earliest slot among slots that are valid for transmission after the slot.

21. 15. The method of claim 14, wherein the downlink radio signal is received when a last symbol among the symbols to which the downlink radio signal is assigned in the slot ends a predetermined number of symbols before a first symbol among the uplink symbols or symbols assigned for transmitting the uplink radio signal.

22. 15. The method of claim 14, wherein if a last symbol among symbols to which a downlink radio signal is assigned in the slot overlaps with at least one of the uplink symbol, a symbol assigned for transmitting the uplink radio signal, or a predetermined number of symbols preceding the first symbol of the symbol, reception of the downlink radio signal is not performed.

23. The method according to claim 21 or 22, wherein the downlink radio signal includes at least one of a physical downlink shared channel, a physical downlink control channel, or a CSI-RS.

24. The method according to claim 21 or 22, wherein at least one of the symbols to which the downlink radio signal is assigned is a flexible symbol.

25. 23. The method of claim 22, wherein the uplink radio signal is a physical random access channel.

26. The slot is configured according to slot configuration information provided by a base station, The method according to claim 14, wherein the information on the slot configuration includes at least one of a cell-specific RRC message generated in an RRC layer, a terminal-specific RRC message, or dynamic slot format information generated in a physical layer.

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