Method, apparatus, and system for uplink transmission and downlink reception in a 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 communication, and more particularly, to methods, apparatuses, and systems for transmitting uplink signals and channels and receiving downlink signals and channels in a wireless communication system.

Background Art

[0002] After the commercialization of the 4G (4th generation) communication system, efforts have been made to develop a new 5G (5th generation) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is referred to as a communication system beyond the 4G network, a system post LTE (Long-Term Evolution), or an NR (New Radio) system. To achieve a high data transmission rate, the 5G communication system includes systems operating using a millimeter wave (mmWave) band of 6 GHz or higher, and also includes communication systems operating using a frequency band of 6 GHz or lower from the aspect of ensuring coverage, and the implementation in base stations and terminals is considered.

[0003] The 3GPP (Registered Trademark, the same hereinafter) (3rd generation partnership project) NR system improves the efficiency of the network spectrum so that a communication carrier can provide more data and voice services with the given bandwidth. Therefore, the 3GPP NR system is designed to meet the requirements for high-speed data and media transmission in addition to supporting large-capacity voice. The advantages of the NR system are high throughput, low latency, FDD (Frequency Division Duplex), and TDD (Time Division Duplex) support on the same platform, an improved end-user environment, and a simple architecture with low operating costs.

[0004] For more efficient data processing, the dynamic TDD of the NR system uses a method of varying the number of OFDM (orthogonal frequency division multiplexing) symbols that can be used for the uplink and downlink according to the data traffic direction of the users in the cell. For example, if the downlink traffic in the cell is larger than the uplink traffic, the base station allocates a larger number of downlink OFDM symbols to the slot (or subframe). Information regarding the slot configuration should be transmitted to the terminal.

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

[0006] On the other hand, the Internet is evolving from a human-centered connection network where humans generate and consume information to an IoT (Internet of Things) network that exchanges and processes information among distributed components such as things. IoE (Internet of Everything) technology, which combines big data processing technology and others through connection with cloud servers and the like, has also emerged. To realize the IoT, technical elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, technologies such as sensor networks for connecting things, machine to machine (M2M), and MTC (machine type communication) have been studied. In the IoT environment, intelligent IT (internet technology) services that collect and analyze data generated from connected things to create new value for human life are provided. The 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 integration and combination of conventional IT technologies and various industries.

[0007] Therefore, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, machine-to-machine, and MTC are realized by techniques such as beamforming, MIMO, and array antennas, which are 5G communication technologies. As the big data processing technology mentioned above, the application of cloud radio access network (cloud RAN) can also be regarded as an example of the integration of 5G technology and IoT technology. Generally, mobile communication systems were developed to provide voice services while ensuring the mobility of users.

[0008] However, mobile communication systems have gradually expanded their service areas to include not only voice but also data services, and have now developed to the extent of providing high-speed data services. However, in the current mobile communication systems providing services, due to resource shortage phenomena and the requirements of users for high-speed services, more advanced mobile communication systems are required.

[0009] In the 3GPP NR system, a dynamic time division duplex (TDD) method is used in which the direction of OFDM symbols constituting a slot can be freely changed according to the uplink and downlink traffic of small cells. The base station transmits information regarding slot configuration to the terminal to support dynamic TDD. However, there is a risk that problems may occur, such as the terminal being unable to receive slot configuration information or the operation of the terminal not being performed due to changes in slot configuration, and thus a method for improving this is required.

Summary of the Invention

Problems 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 problem of the present invention is to provide a terminal that transmits or receives a control channel and an operation method thereof in a situation where the slot configuration including DL symbols, flexible symbols, and UL symbols of a TDD base is changed.

[0012] Another technical problem of the present invention is to provide a base station that receives or transmits a control channel and an operation method thereof in a situation where the slot configuration including DL symbols, flexible symbols, and UL symbols of a TDD base is changed.

[0013] Yet another technical problem of the present invention is to provide a terminal that efficiently transmits or receives a control channel and an operation method thereof, taking into account the switching gap within the slot configuration including DL symbols, flexible symbols, and UL symbols of a TDD base.

[0014] Yet another technical problem of the present invention is to provide a base station that efficiently receives or transmits a control channel and an operation method thereof, taking into account the switching gap within the slot configuration including DL symbols, flexible symbols, and UL symbols of a TDD base.

Means for Solving the Problems

[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 is 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 communication module, a memory configured to store a control program and data used in the terminal, and at least one downlink symbol for the downlink transmission, at least one flexible symbol, and at least one uplink symbol for the uplink transmission. A processor configured to determine whether transmission of the uplink radio signal or reception of the downlink radio signal assigned to the terminal is available on a slot configured to include at least one of the symbols, and to control transmission of the uplink radio signal or reception of the downlink radio signal based on 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 the uplink symbols is equal to or more than a certain number, or when the sum of the number of the uplink symbols and the number of the flexible symbols is equal to or more than a certain number.

[0017] In another aspect, if the number of symbols required for transmission of the physical uplink control channel (hereinafter, symbols for PDCCH transmission) is greater than the number of the uplink symbols or the sum of the number of the uplink symbols and the number of the flexible symbols, the processor drops the physical uplink control channel, converts the physical uplink control channel to another type of physical uplink control channel that requires 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 Hybrid Automatic Repeat Request - Acknowledgement (HARQ - ACK) is mapped to the PUCCH. If the downlink symbol overlaps with the symbol for PDCCH transmission, the processor determines that the transmission of the HARQ - ACK is impossible or postpones the transmission of the HARQ - ACK.

[0019] In yet another aspect, the downlink radio signal includes a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH). When the number of downlink symbols is equal to or more than a certain number, or when the sum of the number of downlink symbols and the number of flexible symbols is equal to or more than a certain number, the processor determines that the transmission of the Physical Downlink Shared Channel or the Physical Downlink Control Channel is possible.

[0020] In yet another aspect, the downlink radio signal is Downlink Control Information (DCI) included in a Physical Downlink Control Channel (PDCCH). The types of the downlink control information include HARQ - ACK, Rank Indicator (RI), and Channel State Information (CSI). The processor determines whether the downlink radio signal can be received based on the 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 still another aspect, if the transmission of the uplink radio signal starts after a predetermined number of gap symbols from the last symbol of the symbols for the transmission of the downlink radio signal among the downlink symbols, the processor performs the transmission of the uplink radio signal.

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

[0024] In still 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 at the RRC layer, a UE-specific RRC message, and dynamic slot format information generated at the physical layer.

[0025] According to another aspect of the present invention, there is provided a method for transmitting and receiving radio signals by a terminal in a wireless communication system. The method includes determining whether transmission of an uplink radio signal or reception of a 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, which is allocated to the terminal, and controlling the transmission of the uplink radio signal or the reception of the downlink radio signal according to the determination.

[0026] On one side, the uplink radio signal includes a Physical Uplink Control Channel (PUCCH), and the controlling step includes the step of transmitting the Physical Uplink Control Channel when the number of the uplink symbols is equal to or more than a certain number, or when the sum of the number of the uplink symbols and the number of the flexible symbols is equal to or more than a certain number.

[0027] On another side, if the number of symbols required for transmitting the Physical Uplink Control Channel (hereinafter, symbols for PDCCH transmission) is greater than the number of the uplink symbols, or the sum of the number of the uplink symbols and the number of the flexible symbols, the controlling step includes the step of dropping the Physical Uplink Control Channel, or converting the Physical Uplink Control Channel into another type of Physical Uplink Control Channel that requires fewer symbols, or transmitting the Physical Uplink Control Channel over at least one slot after the current slot.

[0028] On still another side, the uplink radio signal includes a Physical Uplink Control Channel (PUCCH), HARQ-ACK is mapped to the PUCCH, and the controlling step includes the step of determining that the transmission of the HARQ-ACK is impossible, or postponing the transmission of the HARQ-ACK if the downlink symbol overlaps with the symbol for PDCCH transmission.

[0029] On yet another side, the downlink radio signal includes a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH), and the controlling step includes the 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 more 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 more than a certain number.

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

[0031] In still 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 still another aspect, if the transmission of the uplink radio signal starts after a predetermined number of gap symbols from the last symbol of the symbols for the transmission of the downlink radio signal among the downlink symbols, the controlling step includes a step of transmitting the uplink radio signal.

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

[0034] In still 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 at the RRC layer, a terminal-specific RRC message, and dynamic slot format information generated at the physical layer.

[0035] According to another aspect of the present invention, there is provided a terminal that performs uplink transmission and downlink reception in a wireless communication system. The terminal includes a communication module configured to transmit an uplink radio signal to a base station or receive a downlink radio signal from the base station, and a processor configured to determine whether transmission of the uplink radio signal or reception of the downlink radio signal is effective in a slot including at least one downlink symbol, flexible symbol for downlink transmission, or uplink symbol for uplink transmission, and perform transmission of the uplink radio signal or reception of the downlink radio signal according to the determination.

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

[0037] In another aspect, in the slot, if the first symbol among the symbols to which the uplink radio signal is assigned overlaps at least one symbol among the downlink symbol, the symbol assigned for reception of the downlink radio signal, or a predetermined number of symbols after the last symbol of the symbol, the processor does not perform transmission of the uplink radio signal.

[0038] In still 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 an SRS (sounding reference signal).

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

[0040] In still another aspect, the downlink radio signal includes at least one of an SS / PBCH (synchronization signal / physical broadcast channel) block, a physical downlink shared channel, a physical downlink control channel, or a CSI-RS (channel state information reference signal).

[0041] In still another aspect, the non-performed 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 it, or transmits it in the earliest slot among the slots in which transmission is valid after the slot.

[0042] 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 uplink symbol or the transmission of the uplink radio signal, the processor receives the downlink radio signal.

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

[0044] In still 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 still another aspect, at least one symbol among the symbols to which the downlink radio signal is assigned is a flexible symbol.

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

[0047] In still 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 at the RRC layer, a terminal-specific RRC message, or dynamic slot format information generated at the physical layer.

[0048] According to still 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 includes: determining whether transmission of an uplink radio signal or reception of the downlink radio signal assigned to the terminal is valid in a slot including at least one downlink symbol, flexible symbol, and uplink symbol for uplink transmission; and performing transmission of the uplink radio signal or reception of the downlink radio signal based on the determination.

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

[0050] On the other hand, in the slot, if the first symbol among the symbols to which the uplink radio signal is assigned overlaps at least one symbol among 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 yet another aspect, at least one symbol among the symbols to which the uplink radio signal is assigned is a flexible symbol.

[0053] In yet 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 yet another aspect, the non-transmitted uplink radio signal is a physical uplink control channel, and the physical uplink control channel is transmitted by 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 yet 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 uplink symbol or the symbols assigned for transmission of the uplink radio signal, the reception of the downlink radio signal is performed.

[0056] In yet another aspect, in the slot, if at least one of the last symbol among the symbols to which the downlink radio signal is assigned overlaps with the uplink symbol, the symbol assigned for transmission of the uplink radio signal, or at least one symbol among a predetermined number of symbols before 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 symbol among 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 at the RRC layer, a terminal-specific RRC message, or dynamic slot format information generated at the physical layer.

Advantages of the Invention

[0061] According to the present invention, even if the configuration of the slot is changed, the terminal can transmit the PUCCH, so that omission of PUCCH transmission or unnecessary retransmission of the PUCCH can be prevented. Further, by defining effective timing of an uplink signal such as a PRACH, the frequency efficiency of the network can be increased and the energy consumption of the terminal can be reduced.

[0062] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned should be clearly understood by those with ordinary knowledge in the technical field to which the present invention pertains from the following description.

Brief Description of Drawings

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Embodiments for Carrying Out the Invention

[0064] The terms used in this specification are selected to be as general as currently widely used, taking into account the functions in the present invention, but this may vary depending on the intentions, conventions of those skilled in the art, or the emergence of new technologies. In some specific cases, there are also those arbitrarily selected by the applicant, and in such cases, the meaning is described in the corresponding invention description part. Therefore, it is clarified that the terms used in this specification should be analyzed based not only on the name of the terms but also on the substantial meaning of the terms and the content throughout this specification.

[0065] Throughout the specification, when it is stated that a certain configuration is "connected" to another configuration, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" through other intervening components. Also, when a certain configuration "includes" a specific component, this means that it further includes other components, rather than excluding other components, unless otherwise stated to the contrary. In addition, the limiting terms "above" or "below" based on a specific threshold may be appropriately replaced by "exceeding" or "less than" respectively according to the embodiments.

[0066] The following technologies are used in various wireless connection systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access). CDMA is implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented by radio technologies such as GSM (registered trademark) (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM (registered trademark) Evolution). OFDMA is implemented by radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunication System). 3GPP LTE (Long term evolution) is part of E-UMTS (Evolved UMTS) that uses 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 the eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. Although the description will focus on 3GPP NR for clarity, the technical idea of the present invention is not limited to this.

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

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

[0069] Referring to FIG. 1, the radio frame (or radio frame) used in the 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100)*Tc). Also, the radio frame consists of 10 subframes (subfame, SF) of equal size. Here, Δfmax = 480*103Hz, Nf = 4096, Tc = 1 / (Δfref*Nf,ref), Δfref = 15*103Hz, Nf,ref = 2048. The 10 subframes in one frame are each assigned a number 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 the 3GPP NR system is 15*2μkHz. μ is the 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. The 1 ms long subframe consists of 2μ slots. At this time, the length of each slot is 2-μ ms. The 2μ slots in one subframe are each assigned a number from 0 to 2μ - 1. Also, the slots in one radio frame are each assigned a number from 0 to 10*2μ - 1. The time resource is divided by at least one of the radio frame number (or also referred to as the radio frame index), the subframe number (or also referred to as the subframe index), and the slot number (or also referred to as the slot index).

[0070] Figure 2 is a diagram showing an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the resource grid structure of a 3GPP NR system.

[0071] There is one resource grid per antenna port. Referring to Figure 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 interval. 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, and the like.

[0072] Referring to Figure 2, the signal transmitted from each slot is represented by a resource grid consisting of Nsize, μgrid, x * NRBSC subcarriers and Nslotsymb OFDM symbols. Here, if it is a downlink resource grid, x = DL, and if it is an uplink resource grid, x = UL. Nsize, μgrid, and x indicate the number of resource blocks (RBs) according to the subcarrier spacing configuration 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. An OFDM symbol is referred to as a CP-OFDM (cyclic prefix OFDM) symbol or a DFT-S-OFDM (discrete Fourier transform spread OFDM) symbol depending on the multiple access method.

[0073] The number of OFDM symbols included in one slot can vary depending on the length of the CP (cyclic prefix). For example, if it is a normal CP, one slot contains 14 OFDM symbols, while if it is an extended CP, one slot contains 12 OFDM symbols. In a specific embodiment, the extended CP is only used at a subcarrier spacing of 60 kHz. In FIG. 2, for the sake of convenience of explanation, the case where one slot consists of 14 OFDM symbols is illustrated, but the embodiments of the present invention are applied in the same manner to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, x*NRBSC subcarriers in the frequency domain. The types of subcarriers are divided into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also referred to as the center frequency (fc).

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

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

[0076] Each symbol of a radio frame operating in TDD (time division duplex) or unpaired spectrum consists of at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. A radio frame operating on a downlink carrier in FDD (frequency division duplex) or paired spectrum consists of a downlink symbol or a flexible symbol, and a radio frame operating on an uplink carrier consists of an uplink symbol or a flexible symbol. Downlink transmission is possible in a downlink symbol but uplink transmission is not, and uplink transmission is possible in an uplink symbol but downlink transmission is not. A flexible symbol is determined to be used for downlink or uplink according to a signal.

[0077] Information regarding the type of each symbol, that is, information indicating any one of a downlink symbol, an uplink symbol, and a flexible symbol, consists of a cell-specific (or common) RRC signal. Also, information regarding the type of each symbol consists additionally of a UE-specific (or dedicated) RRC signal. The base station uses the cell-specific RRC signal to notify 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, v) the number of uplink symbols from the last symbol of the slot immediately preceding the slot having only uplink symbols. Here, a symbol not configured with 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 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, a maximum of two DL / UL switchings are allowed in one slot.

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

[0083] If the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation S101. Specifically, the terminal synchronizes with the base station in the initial cell search. For this purpose, 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 obtains information such as the cell ID. Next, the terminal receives a physical broadcast channel from the base station and obtains the broadcast information in the cell.

[0084] The terminal that has completed the initial cell search obtains more detailed system information than the system information obtained through the initial cell search by receiving a physical downlink control channel (PDCCH) and information carried on the PDCCH on a physical downlink shared channel (PDSCH) S102.

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

[0086] After the above-described procedure, the terminal performs PDCCH / PDSCH reception S107 and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) as a general uplink / downlink signal transmission procedure S108. 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. Also, the DCI may have different formats depending on the usage purpose. The uplink control information (UCI) transmitted by the terminal to the base station via the uplink includes downlink / uplink ACK / NACK signals, CQI (channel quality indicator), PMI (precoding matrix index), RI (rank indicator), etc. Here, CQI, PMI, and RI are included in CSI (channel state information). In the case of a 3GPP NR system, the terminal transmits control information such as the above-described HARQ-ACK and CSI via the PUSCH and / or PUCCH.

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

[0088] When the terminal is powered on or attempts to newly access a 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. For this purpose, 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 the cell identifier (identity, ID).

[0089] Referring to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into the PSS and the SSS. The PSS is used to obtain time-domain synchronization such as OFDM symbol synchronization and slot synchronization and / or frequency-domain synchronization. The SSS is used to obtain frame synchronization and cell group ID. Referring to FIG. 4(a) and Table 2, the SS / PBCH block consists of 20 RBs (= 240 subcarriers) continuous in the frequency axis and 4 OFDM symbols continuous in the time axis. At this time, in the SS / PBCH block, the PSS is transmitted through the first OFDM symbol, and the SSS is transmitted through the 3rd OFDM symbol via subcarriers 56 to 182. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol where the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, that is, subcarriers 0 to 55 and 183 to 239. Also, in the 3rd OFDM symbol where the SSS is transmitted, the base station does not transmit signals via subcarriers 48 to 55 and 183 to 191. The base station transmits the PBCH (physical broadcast channel) via the remaining REs except the said signals in the SS / PBCH block.

[0090]

Table 2

[0091] The SS has a total of 1008 unique physical layer cell identifiers through combinations of three PSSs and SSSs. Specifically, each physical layer cell ID becomes part of only one physical-layer cell-identifier group, and each group is grouped into 336 physical-layer cell-identifier groups, each containing three unique identifiers. Thus, the physical layer cell ID NcellID = 3N(1)ID + N(2)ID is uniquely defined by the index N(1)ID in the range from 0 to 335 indicating the physical-layer cell-identifier group and the index N(2)ID from 0 to 2 indicating the physical-layer identifier within the physical-layer cell-identifier group. The terminal detects the PSS and identifies one of the three unique physical-layer identifiers. Also, the terminal detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical-layer identifier. At this time, the sequence d PSS (n) is as shown in Equation 1 below.

[0092]

Number

[0093]

Number

Number

[0094]

Number

[0095]

Number

Number

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

[0097] FIG. 5 is a diagram showing procedures for control information and control channel transmission in a 3GPP NR system. Referring to FIG. 5(a), at S202, the base station adds a cyclic redundancy check (CRC) masked (e.g., XOR operation) with a radio network temporary identifier (RNTI) to control information (e.g., DCI). The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTIs used by one or more terminals include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). Also, the terminal-specific RNTIs include at least one of a cell temporary RNTI (C-RNTI), a CS-RNTI, or an MCS-C-RNTI. Next, after performing channel encoding (e.g., polar coding) at S204, the base station performs rate-matching at S206 according to the amount of resource(s) used for PDCCH transmission. Next, at S208, the base station multiplexes DCI(s) based on a CCE (control channel element)-based PDCCH structure. Also, after applying additional processes S210 such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI(s), the base station maps them to the resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE consists of a plurality (e.g., six) of resource element groups (REGs). One REG consists of a plurality (e.g., twelve) of resource elements (REs). The number of CCEs used for one PDCCH is defined as the aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 are used.FIG. 5(b) is a diagram related to the CCE aggregation level and multiplexing of PDCCH, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region thereby.

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

[0099] The CORESET is the time - frequency resource in which the PDCCH, which is a control signal for the terminal, is transmitted. Also, the search space described later is mapped to one CORESET. Therefore, instead of monitoring all frequency bands to receive the PDCCH, the terminal monitors the CORESET and the designated time - frequency region to decode the PDCCH mapped to the CORESET. The base station configures one or more CORESETs for each cell for the terminal. The CORESET consists of up to three consecutive symbols on the time axis. Also, the CORESET consists of units of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 consists of consecutive PRBs, and CORESET#2 and CORESET#3 consist of non - consecutive PRBs. The CORESET can be located in any symbol within the slot. For example, in the embodiment of FIG. 5, CORESET#1 starts from the first symbol of the slot, CORESET#2 starts from the fifth symbol of the slot, and CORESET#9 starts from the ninth symbol of the slot.

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

[0101] To transmit PDCCH to a terminal, there is at least one or more search spaces in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) where the PDCCH of the terminal is transmitted. The search space includes a common search space that all terminals in a cell belonging to the same base station 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 the cells belonging to the same base station are set to commonly monitor the PDCCH that is set to be searched. Also, the terminal-specific search space is set for each terminal to monitor the PDCCH assigned to each terminal at different search space positions according to the terminal. In the case of the terminal-specific search space, since it is a restricted control region where the PDCCH is assigned, the search spaces between terminals may be partially overlapped and assigned. Monitoring the PDCCH includes blind decoding the PDCCH candidates in the search space. When the blind decoding is successful, it is expressed that the PDCCH is (successfully) detected / received, and when the blind decoding fails, it is expressed that the PDCCH is not detected / not received, or not successfully detected / received.

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

[0103] The base station notifies each terminal or terminal group of information regarding resource allocation of the PCH (paging channel) and DL-SCH (downlink-shared channel), which are transmission channels, via the PDCCH (i.e., DL Grant), or information regarding resource allocation of the UL-SCH and HARQ (hybrid automatic repeat request) (i.e., UL Grant). The base station transmits the PCH transmission block and the DL-SCH transmission block via the PDSCH. The base station transmits data other than specific control information or specific service data via the PDSCH. Also, the terminal receives data other than specific control information or specific service data via the PDSCH.

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

[0105] Table 3 shows an example of the PUCCH used in the 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: Response to the PDCCH (indicating DL SPS release) and / or response to the uplink transport block (TB) on the PDSCH. HARQ-ACK indicates whether the information transmitted via the PDCCH or PDSCH has been received successfully. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK, ACK / NACK. Generally, ACK is represented by the bit value 1 and NACK is represented by the bit value 0.

[0110] - CSI: Feedback information for the downlink channel. It is generated by the terminal based on the CSI-RS (Reference Signal) transmitted by the 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 the CSI.

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

[0112] PUCCH format 0 is a format for transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted via one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted with two OFDM symbols, the same sequence is transmitted on different RBs for the two symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, the terminal is M bit bits UCI (M bit = 1 or 2) to determine the value m cs of the cyclic shift, and maps the sequence obtained by cyclic-shifting the base sequence of length 12 by the determined value m cs to 12 REs of one OFDM symbol and one PRB for transmission. The number of available cyclic shifts for the terminal is 12. If M bit = 1, 1-bit UCI0 and 1 are represented by sequences corresponding to two cyclic shifts with a cyclic shift value difference of 6. Also, if M bit = 2, 2-bit UCI00, 01, 11, 10 are represented by sequences corresponding to 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 via OFDM symbols that are continuous 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 QPSK (quadrature phase shift keying). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. The terminal spreads and transmits the obtained signal on the even-numbered OFDM symbols assigned to PUCCH format 1 using time-axis OCC (orthogonal cover code). The maximum number of different terminals multiplexed in the same RB for PUCCH format 1 can be determined according to the length of the OCC used. DMRS (demodulation reference signal) is spread and mapped by OCC on the odd-numbered OFDM symbols of PUCCH format 1.

[0114] PUCCH format 2 transmits UCI exceeding 2 bits. PUCCH format 2 is transmitted via one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted using two OFDM symbols, the same sequence is transmitted on different RBs via the two OFDM symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, Mbit-bit UCI (Mbit > 2) is bit-level scrambled, QPSK modulated, and mapped to the RB(s) of one or two OFDM symbol(s). 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 via OFDM symbols continuous in the time domain and one PRB in the frequency domain. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. Specifically, the terminal modulates Mbit bits of UCI (Mbit > 2) with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(Msymb-1). Here, when using π / 2-BPSK, Msymb = Mbit, and when using QPSK, Msymb = Mbit / 2. The terminal does not apply block-unit spreading to PUCCH format 3. However, the terminal may apply block-unit spreading to one RB (i.e., 12 subcarriers) using a length-12 PreDFT-OCC so that PUCCH format 4 has two or four multiplexing capacities. The terminal transmit precodes (or DFT-precodes) the spread signal and maps it to each RE to transmit the spread signal.

[0116] At this time, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of the 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] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via an RRC signal such that it indicates frequency hopping within a slot. When the frequency hopping is configured, the index of the RBs to be frequency-hopped is from the RRC signal. If the 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] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted over a plurality of slots. At this time, the number K of slots over which the PUCCH is repeatedly transmitted is configured by the RRC signal. The repeatedly transmitted PUCCH should start from the OFDM symbol at the same position within each slot and have the same length. If any one of the OFDM symbols of the slot in which the terminal should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the terminal does not transmit the PUCCH from the corresponding slot and defers the transmission to the next slot.

[0119] On one hand, in the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or equal to the bandwidth of the carrier (or cell). Therefore, the terminal constitutes a BWP (bandwidth part) consisting of a part of the continuous bandwidth within the carrier bandwidth. A terminal operating according to TDD or operating in an unpaired spectrum can constitute a maximum of 4 DL / UL BWP pairs for one carrier (or cell). Also, the terminal activates one DL / UL BWP pair. A terminal operating according to FDD or operating in a paired spectrum can constitute a maximum of 4 DL BWPs for the downlink carrier (or cell) and a maximum of 4 UL BWPs for the 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 the active BWP.

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

[0121] FIG. 8 is a conceptual diagram for explaining carrier aggregation. Carrier aggregation means a method in which a terminal uses a plurality of frequency blocks composed of uplink resources (or component carriers) and / or downlink resources (or component carriers), or cells (in a logical sense), to use them in one large logical frequency band in order for a wireless communication system to use a wider frequency band. Hereinafter, for convenience of explanation, the term "component carrier" will be unified.

[0122] Referring to FIG. 8, as an example of a 3GPP NR system, the overall system band includes a maximum of 16 component carriers, and each component carrier has a bandwidth of up to 400 MHz. A component carrier includes one or more physically continuous subcarriers. In FIG. 8, each component carrier is shown as having the same bandwidth, but this is only an example, and each component carrier may have a different bandwidth from each other. Also, each component carrier is shown as being adjacent to each other on the frequency axis, but the drawing shows a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

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

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

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

[0126] Referring to FIG. 9(a), in a general wireless communication system, data transmission or reception is performed via one DL band and a corresponding UL band in the case of the FDD mode. In another specific embodiment, in the case of the TDD mode, a radio frame is divided into an uplink time unit and a downlink time unit in the time domain, and data transmission or reception is performed via the uplink / downlink time unit. Referring to FIG. 9(b), three 20-MHz component carriers (CCs) are aggregated for UL and DL respectively, supporting a bandwidth of 60 MHz. Each CC may or may not be adjacent to each other in the frequency domain. FIG. 9(b) shows the case where, for the sake of convenience, the bandwidths of the UL CC and the DL CC are both the same and symmetric, but the bandwidth of each CC may be determined independently. Also, an asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CC assigned / configured to a specific terminal via RRC is referred to as the serving DL / UL CC of the specific terminal.

[0127] The base station communicates with the terminal by activating some or all of the serving CCs of the terminal or deactivating some CCs. The base station may change the CCs to be activated / deactivated or change the number of CCs to be activated / deactivated. When the base station assigns the CCs available to the terminal on a cell-specific or terminal-specific basis, at least one of the once-assigned CCs does not have to be deactivated unless the CC assignment for the terminal is completely reconfigured or the terminal performs a handover. One CC that is not deactivated for the terminal is referred to as the primary CC (PCC) or primary cell (PCell), and the CCs that can be freely activated / deactivated by the base station are referred to as secondary CCs (SCCs) or secondary cells (SCells).

[0128] On the other hand, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink resources and uplink resources, that is, a combination of DL CC and UL CC. A cell consists of DL resources alone or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resources (or DL CC) and the carrier frequency of the UL resources (or UL CC) is indicated by the system information. The carrier frequency means the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in the downlink is the DL PCC, and the carrier corresponding to the PCell in the uplink is the UL PCC. Similarly, the carrier corresponding to the SCell in the downlink is the DL SCC, and the carrier corresponding to the SCell in the uplink is the UL SCC. Depending on the terminal capacity, the serving cell(s) consist of one PCell and zero or more SCells. In the case of a UE in the RRC_CONNECTED state but with carrier aggregation not configured or not supported, there is only one serving cell consisting of the PCell alone.

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

[0130] FIG. 10 is a diagram showing an example to which a cross-carrier scheduling technique is applied. If cross-carrier scheduling is set, the control channel transmitted via the first CC schedules the data channel transmitted via the first CC or the second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set, and the DL grant / UL grant transmitted from the PDCCH area of the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, a search area for a plurality of component carriers exists in the PDCCH area of the scheduling cell. The 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 the DL PCC (or, the PCell), and DL component carriers #1 and #2 are DL SCCs (or, SCell). Also, it is assumed that the DL PCC is set as the PDCCH monitoring CC. Without configuring cross-carrier scheduling by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, the CIF will be disabled, and each DL CC will transmit only the PDCCH that schedules its own PDSCH without CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the contrary, if cross-carrier scheduling is configured by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, the CIF will be enabled, and a specific CC (e.g., the DL PCC) will transmit not only the PDCCH that schedules the PDSCH of DL CC A using the CIF, but also the PDCCH that schedules the PDSCH of other CCs (cross-carrier scheduling). On the contrary, no PDCCH is transmitted on other DL CCs. Therefore, according to whether cross-carrier scheduling is configured for the terminal or not, the terminal monitors the PDCCH without CIF to receive the self-carrier scheduled PDSCH, or monitors the PDCCH with CIF to receive the cross-carrier scheduled PDSCH.

[0132] On the other hand, FIGS. 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, but the same or similar configuration is also applicable to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

[0133] In the present invention, the number of symbols included in one slot is 14 for a cell consisting of a normal CP (cyclic prefix), and 12 for a cell consisting of an extended CP. For the sake of convenience in explanation, it will be assumed that there are 7 symbols for explanation.

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

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

[0136] One slot contains 7 symbols. When changing from the downlink to the uplink or from the uplink to the downlink, there is a gap (GP). That is, a gap is inserted between the downlink and the uplink or between the uplink and the downlink. One symbol is used to transmit downlink control information. Hereinafter, the symbol constituting the gap is referred to as a gap symbol.

[0137] A slot containing only DL symbols (DL-only) contains only DL symbols literally. For example, a slot containing only DL symbols contains 7 DL symbols like DL-only in FIG. 11.

[0138] A slot mainly consisting of DL symbols (DL-centric) contains a large number of DL symbols, at least one gap symbol, and at least one UL symbol. For example, a slot mainly consisting of DL symbols contains 5 DL symbols, one gap symbol, and one UL symbol in sequence like DL-centric in FIG. 11.

[0139] UL-centric slots that mainly consist of UL symbols include at least one DL symbol, at least one gap symbol, and a number of UL symbols. For example, a UL-centric slot as shown in the UL-centric of FIG. 11 sequentially includes one DL symbol, one gap symbol, and five UL symbols.

[0140] UL-only slots that only contain UL symbols literally only contain UL symbols. For example, a UL-only slot as shown in the UL-only of FIG. 11 includes seven UL symbols.

[0141] The network notifies the terminal of the default slot configuration, and for this purpose, RRC signaling is used. Information regarding the RRC signaling and the set default slot configuration is referred to as semi-static DL / UL allocation information. The default slot configuration is the slot configuration that the terminal can assume the network uses if the base station does not transmit signaling for a separate change in the slot configuration to the terminal. In the 3GPP NR system, dynamic TDD that changes the slot configuration according to various traffic situations of the terminal is supported. For this purpose, the base station notifies the terminal of the slot configuration of the current or future slot every slot, or every few slots, or every time the base station changes the slot configuration. To notify the slot configuration, two methods are used in the NR system.

[0142] The first method is a method that uses group common PDCCH. The group common PDCCH is a PDCCH that is broadcast to a plurality of terminals and is transmitted every slot, every few slots, or only when the base station requires it. The group common PDCCH includes a (dynamic) slot format information indicator (SFI) for transmitting information related to the slot configuration. The slot format information indicator informs the current slot configuration in which the group common PDCCH is transmitted or the current slot configuration and several future slot configurations. If a terminal receives the group common PDCCH, it knows the current slot configuration or the future slot configuration including the current slot configuration via the slot configuration information indicator included in the group common PDCCH. If the reception of the group common PDCCH fails, the terminal cannot determine whether the base station transmitted the group common PDCCH.

[0143] The second method is a method of transmitting information related to the slot configuration by a UE-specific PDCCH that schedules a PDSCH or a PUSCH. The UE-specific PDCCH is transmitted unicast only to a specific user who requires scheduling. The UE-specific PDCCH transmits the same slot format information indicator as that transmitted by the group common PDCCH as the slot configuration information of the scheduled slot. Alternatively, the UE-specific PDCCH includes information from which the configuration of the scheduled slot can be inferred. As an example, by receiving the UE-specific PDCCH assigned to itself, the terminal knows the position of the slot and the OFDM symbols within the slot to which the PDSCH or PUSCH is assigned, 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 symbols within the slot, and then infers the configuration of the slot in which the PUCCH is transmitted.

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

[0145] In addition, the uplink signal used in the present invention is a radio signal transmitted by a terminal to a base station, and includes a physical uplink channel, a sequence, a reference signal (such as SRS, etc.) generated and processed at the physical layer, and a MAC message and an RRC message (or RRC signaling) generated and processed at the MAC layer and the 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 showing 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 PUCCHs according to the size of the time resource (i.e., the number of symbols) used for the transmission of the PUCCH.

[0148] The first type of PUCCH is called Long PUCCH and is mapped to and transmitted on four or more consecutive symbols of a slot. The first type of PUCCH is mainly used to transmit a large amount of UCI (uplink control information) or is assigned to a user with low signal strength to increase the PUCCH coverage. Also, the first type of PUCCH is repeatedly transmitted in multiple slots to increase the PUCCH coverage. The first type of PUCCH includes PUCCH format 1 that transmits 1 or 2 bits of UCI, PUCCH format 3 that transmits UCI exceeding 2 bits without supporting multiplexing between users, and PUCCH format 4 that transmits UCI exceeding 2 bits while supporting multiplexing between users.

[0149] The second type of PUCCH is called Short PUCCH and is mapped to and transmitted on one or two symbols of a slot, is used to transmit a small amount of UCI, or is assigned to a user with high signal strength, and is also used to support services that require low latency. The second type of 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 available for use as the first type of PUCCH and time - frequency resources available for use as the second type of PUCCH, which are assigned to different terminals respectively or to one terminal. When assigned to one terminal, the first type of PUCCH and the second type of PUCCH are transmitted in different time resources (i.e., different OFDM symbols). That is, when assigned to one terminal, the first type of PUCCH and the second type of PUCCH are transmitted in a TDM (Time Division Multiplexing) manner.

[0151] The UCI mapped to the PUCCH includes SR (Scheduling grant), HARQ-ACK, RI, CSI, and BI (Beam-related Information). SR is information for the terminal to notify the base station that there is an uplink transmission. HARQ-ACK is information for notifying whether the reception of the PDSCH transmitted by the base station is successful. RI is information for notifying the rank that can be transmitted over the radio channel when using multiple antennas. CSI is information for the terminal to notify the measured value of the channel status between the base station and the terminal. BI is information for notifying information related to beamforming at the transmission end and the reception end.

[0152] Referring to FIG. 12(a), the DL-centric slot mainly composed of the illustrated DL symbols is configured and indicated by five DL symbols, one flexible symbol, and one UL symbol. A second type of PUCCH with a length of one symbol is allocated to the DL-centric slot. The second type of PUCCH is located at the last symbol of the slot.

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

[0154] Referring to FIG. 12(c), the UL only slot where only UL symbols exist is allocated the first type of PUCCH or / and the second type of PUCCH. For example, the first type of PUCCH is mapped to six symbols, and the second type of PUCCH is mapped to the last symbol of the slot.

[0155] Referring to FIGS. 11 and 12, the slot configurations capable of transmitting the second type of PUCCH are slots mainly composed of DL symbols, slots mainly composed of UL symbols, and slots containing only UL symbols. The slot configurations capable of transmitting the first type of PUCCH are slots mainly composed of UL symbols and slots containing only UL symbols. Also, for the first type of PUCCH and the second type of PUCCH, the slots capable of being transmitted by TDM are slots mainly composed of UL symbols and slots containing only UL symbols. Incidentally, since there is one symbol assigned in the uplink in the slot mainly composed of DL symbols, the second type of PUCCH can be transmitted, but the first type of PUCCH cannot be transmitted. Therefore, the PDCCH for scheduling the PUCCH allocates the first type of PUCCH to slots mainly composed of UL symbols or slots containing only UL symbols. Also, the PDCCH for scheduling the PUCCH allocates the second type of PUCCH to slots mainly composed of DL symbols, slots mainly composed of UL symbols, or slots containing only UL symbols.

[0156] As described above, the base station (or network) changes the slot configuration according to the traffic and various situations of the terminal, and notifies the terminal of the change in the corresponding slot configuration. Since the slot configuration is thus changed, the terminal should receive the slot configuration information indicator or information regarding the slot configuration by monitoring the group-shared PDCCH and the terminal-specific PDCCH. However, due to problems such as the radio channel situation and interference between the base station and the terminal, the terminal may fail to receive the group-shared PDCCH and the terminal-specific PDCCH.

[0157] If the terminal fails to receive the group-shared PDCCH and / or the UE-specific PDCCH, the terminal cannot recognize 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 conform to the changed slot configuration, if the terminal forcibly performs the PUCCH transmission as scheduled, the PUCCH transmission may fail, resulting in problems such as temporary communication interruption or delay. Therefore, in such a case, clear procedures for whether the terminal should perform the indicated PUCCH transmission or abandon it, and if it is to perform the transmission, how to perform the transmission, or a priori agreements between the terminal and the base station are required.

[0158] An embodiment therefor defines an operating method for a terminal and a base station to solve the case where the terminal fails to receive the group-shared PDCCH and / or the UE-specific PDCCH including the slot configuration information indicator and the slot configuration related information.

[0159] And another embodiment defines an operating method for a terminal that processes the transmission of the PUCCH and an operating method for a base station that processes the reception of the allocated PUCCH, in a situation where the configuration of the slot in which the PUCCH is allocated (or the transmission of the PUCCH is scheduled) is changed and the allocated PUCCH cannot be transmitted even though the terminal has successfully received the group-shared PDCCH and / or the UE-specific PDCCH including the slot configuration information indicator and the slot configuration related information.

[0160] [Embodiment] First, an operating method for a terminal and a base station according to this embodiment will be disclosed. This embodiment realizes a predictable communication situation between the terminal and the base station by imposing certain constraints on the slot configuration change of the base station. In this case, the PUCCH transmission of the terminal is performed regardless of the success or failure of receiving the group-shared PDCCH and the UE-specific PDCCH of the terminal.

[0161] Example: Maintain the slot configuration of the slot containing the symbol to which PUCCH is allocated (or transmitted) without change

[0162] This embodiment is further divided into detailed examples according to whether the assigned (or transmitted) PUCCH is a type 1 PUCCH or a type 2 PUCCH. As an example, the slot configuration of the symbol to which the type 1 PUCCH is assigned (or transmitted) remains the same without being changed. That is, it is assumed (or agreed, expected) that the base station does not change the slot configuration of the OFDM symbol to which the type 1 PUCCH is assigned, and the terminal also assumes that the slot configuration of the OFDM symbol to which the type 1 PUCCH is assigned will not be changed. Therefore, the terminal transmits the type 1 PUCCH regardless of the reception of the slot configuration information indicator and the slot configuration related information transmitted by the group-shared PDCCH and the terminal-specific PDCCH.

[0163] As another example, the slot configuration of the symbol to which the type 2 PUCCH is assigned (or transmitted) remains the same without being changed. That is, it is assumed (or agreed, expected) that the base station does not change the slot configuration of the symbol to which the type 2 PUCCH is assigned (or transmitted), and the terminal also assumes that the slot configuration of the symbol to which the type 2 PUCCH is assigned (or transmitted) will not be changed. Therefore, the terminal transmits the type 2 PUCCH regardless of the reception of the slot configuration information indicator and the slot configuration related information transmitted by the group-shared PDCCH and the terminal-specific PDCCH.

[0164] The embodiment that prohibits the base station from changing the slot configuration as described above may impose constraints on flexible scheduling. To complement such aspects, embodiments of other aspects that allow the base station to change the slot configuration within a certain range are disclosed below.

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

[0166] Even if the slot configuration of the symbol to which the PUCCH is allocated (or transmitted) is changed, it is only changed to a slot configuration in which the transmission of the PUCCH is possible, and it is not changed to a slot configuration in which the transmission of the PUCCH is impossible. Therefore, the terminal does not expect a change to a slot in which the transmission of the PUCCH is impossible for the slot in which the transmission of the PUCCH is instructed from the base station. Embodiments according to this aspect are further divided into detailed embodiments depending on whether the allocated (or transmitted) PUCCH is a type 1 PUCCH or a type 2 PUCCH.

[0167] As an example, even if the base station changes the slot configuration of the symbol to which the type 1 PUCCH is allocated, it can be changed to a slot configuration in which the transmission of the type 1 PUCCH is possible, and it cannot be changed to a slot configuration in which the transmission of the type 1 PUCCH is impossible. Therefore, the terminal does not expect a change to a slot in which the transmission of the type 1 PUCCH is impossible for the slot in which the transmission of the type 1 PUCCH is instructed from the base station. Even if the terminal fails to receive the group-shared PDCCH including the slot configuration information indicator of the slot in which the type 1 PUCCH is transmitted, the terminal always transmits the type 1 PUCCH with the allocated resources.

[0168] For example, referring to FIG. 12, the base station can change the slot mainly including the UL symbol to which the type 1 PUCCH having a 4 OFDM symbol length is allocated 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 including DL symbols. On the other hand, as for the terminal, it expects that the slot mainly including the UL symbol to which the type 1 PUCCH having a 4 OFDM symbol length is allocated and instructed to transmit from the base station is changed to a slot including only UL symbols, but does not expect a change to a slot including only DL symbols or a slot mainly including DL symbols. Also, the terminal does not expect a change in the slot configuration in which the UL symbol(s) instructed from the base station to transmit the type 1 PUCCH is / are 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 of PUCCH is allocated, it can be changed to a slot configuration in which the second type of PUCCH can be transmitted, and cannot be changed to a slot configuration in which the second type of PUCCH cannot be transmitted. Therefore, the terminal does not expect a change to a slot in which the second type of PUCCH cannot be transmitted for the slot instructed by the base station to transmit the second type of PUCCH. Even if the terminal fails to receive the group-shared PDCCH including the slot configuration information indicator of the slot in which the second type of PUCCH is transmitted, the terminal always transmits using the resources allocated for the second type of PUCCH. More specifically, the base station can change the slot mainly composed of UL symbols to which the second type of PUCCH is allocated to a slot mainly composed of DL symbols in which the second type of PUCCH can be transmitted or a slot including only UL symbols, but cannot be changed to a slot including only DL symbols in which the second type of PUCCH cannot be transmitted. And also as the terminal, for the slot instructed to transmit the second type of PUCCH, it does not expect the base station to change to a slot in which the second type of PUCCH cannot be transmitted.

[0170] For example, the terminal expects (or anticipates) that the slot mainly composed of UL symbols to which the second type of PUCCH with a length of 1 or 2 symbols instructed by the base station to transmit is allocated can be changed to a slot mainly composed of DL symbols including the second type of PUCCH or a slot including only UL symbols, but does not expect (or anticipate) to be changed to a slot including only DL symbols that cannot include the second type of PUCCH. Also, 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 of PUCCH is / are changed to DL symbol(s).

[0171] As described above, embodiments of other aspects for further improving the scheduling flexibility are disclosed as compared with the embodiments that allow the base station to change the slot configuration within a certain range.

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

[0173] The base station freely changes the configuration of the slot to which the PUCCH is assigned.

[0174] In an example where the PUCCH is a type-1 PUCCH, if the terminal fails to receive a group-shared PDCCH including a slot configuration information indicator of the slot in which the terminal transmits the type-1 PUCCH, the terminal does not transmit on the resources assigned to the type-1 PUCCH.

[0175] In another example where the PUCCH is a type-2 PUCCH, if the terminal fails to receive a group-shared PDCCH including a slot configuration information indicator of the slot in which the terminal transmits the type-2 PUCCH, the terminal does not transmit on the resources assigned to the type-2 PUCCH.

[0176] According to the above-described embodiments, even if the terminal fails to receive a group-shared PDCCH and / or a terminal-specific PDCCH from the base station, since the transmission availability and transmission procedure of the scheduled PUCCH are clearly defined, communication error and delay problems are solved.

[0177] [Other Embodiments] Other embodiments of this specification relate to the operation procedures of the terminal and the base station when the base station can freely change the slot configuration and the terminal successfully receives at least one of a group-shared PDCCH including a slot configuration information indicator, slot configuration-related information, and a terminal-specific PDCCH.

[0178] More specifically, if the configuration of the slot to which the PUCCH is assigned (or in which the transmission of the PUCCH is scheduled) is changed and the changed slot configuration contradicts the PUCCH (that is, if the symbol to which the PUCCH is assigned within the slot to which the PUCCH is assigned overlaps with the DL symbol according to the changed slot configuration), the terminal that processes the transmission of the PUCCH and its operation method, and the base station that processes the reception of the PUCCH and its operation method are disclosed.

[0179] In the changed slot configuration, the assigned PUCCH transmission may or may not be possible (or valid, compliant) (so-called conflicting slot configurations). Here, slots in which PUCCH transmission is possible include, for example, referring to FIG. 12, slots mainly composed of UL symbols to which the first type of PUCCH is assigned, or slots including only UL symbols, slots mainly composed of DL symbols to which the second type of PUCCH is assigned, or slots mainly composed of UL symbols, or slots including only UL symbols. Also, slots in which PUCCH transmission is not possible include, for example, when the slot to which the first type of PUCCH is assigned is changed to a slot mainly composed of DL symbols or a slot configuration including only DL symbols, or when the slot to which the second type of PUCCH is assigned is changed to a slot configuration including only DL symbols.

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

[0181] PUCCH processing method in the indicated slot

[0182] First, when the allocated PUCCH is a type-1 PUCCH, the processing method of the PUCCH under conflicting slot configurations will be described. For the type-1 PUCCH, UCI (such as HARQ-ACK, RI, CSI, etc.) described with reference to FIG. 3 is mapped.

[0183] On one hand, the processing method of the PUCCH includes the step of the terminal receiving a group-shared PDCCH including a slot configuration information indicator of the slot in which the transmission of the type-1 PUCCH is indicated, and the step of performing the transmission of the type-1 PUCCH or the type-2 PUCCH in the indicated slot according to the conditions by the following examples.

[0184] As an example, the terminal transmits the type-1 PUCCH in the indicated slot based on the result of comparing the UL symbol according to the slot configuration in the slot in which the transmission of the type-1 PUCCH is indicated with the UL symbol allocated for the transmission of the type-1 PUCCH. For example, if the UL symbol according to the slot configuration in the slot in which the transmission of the type-1 PUCCH is indicated is larger than (or greater than or equal to) the UL symbol required for the transmission of the type-1 PUCCH, the terminal transmits the type-1 PUCCH with the resources allocated in the slot.

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

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

[0187] As another example, the terminal compares the UL symbols, flexible symbols, and the UL symbols allocated for the transmission of the first type of PUCCH in the slot configuration in the slot where the transmission of the first type of PUCCH is indicated, and based on the comparison result, transmits the first type of PUCCH, or drops or defers the transmission. For example, if the symbols including the UL symbols and flexible symbols in the slot configuration in the slot where the transmission of the first type of PUCCH is indicated are smaller than the UL symbols required for the transmission of the first type of PUCCH, the terminal abandons the transmission of the first type of PUCCH in the indicated slot. For example, if the slot where the PUCCH transmission is indicated is a multi-slot, the terminal transmits the first type of PUCCH in the slot that satisfies the number of UL symbols allocated for the first type of PUCCH transmission among the multi-slots. On the contrary, if the slot where the PUCCH transmission is indicated is a single slot, the terminal abandons or defers the scheduled transmission of the first type of PUCCH.

[0188] In other aspects, the PUCCH processing method includes the steps of the terminal receiving the group-shared PDCCH and the terminal-specific PDCCH that notify the slot configuration of the slot where the transmission of the first type of PUCCH is indicated, and conditionally performing the transmission of the first type of PUCCH or the second type of PUCCH. In this case, the terminal determines whether to perform the transmission of the first type of PUCCH in the indicated slot according to the conditions exemplified below.

[0189] As an example, i) the base station can change the configuration of the slot to which the first type of PUCCH is allocated, ii) the terminal successfully receives the group-shared PDCCH and the terminal-specific PDCCH that notify the configuration of the slot to which the first type of PUCCH is allocated, and iii) if the slot configuration is a slot capable of transmitting the first type of PUCCH, the terminal transmits the first type of PUCCH with the resources allocated to the slot.

[0190] As another example, i) the base station can change the configuration of a slot to which a first type of PUCCH is allocated, ii) the terminal successfully receives a group-shared PDCCH and a terminal-specific PDCCH that notify the configuration of the slot to which the first type of PUCCH is allocated, and iii) if the slot configuration is a slot in which the first type of PUCCH cannot be transmitted, the terminal either does not transmit the first type of PUCCH in the slot, transmits the first type of PUCCH according to the changed slot configuration, or transmits a second type of PUCCH in the slot instead of the first type of PUCCH as shown in FIG. 13. The specific operations of the terminal are 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 a slot to which a first type of PUCCH is assigned, ii) the terminal successfully receives a group common PDCCH and a terminal-specific PDCCH that notify the configuration of the slot to which the first type of PUCCH is assigned, iii) the slot configuration is a slot capable of transmitting the first type of PUCCH, iv) a PUSCH is assigned to the slot (or PUSCH transmission is scheduled) and is set for simultaneous transmission of PUCCH and PUSCH, and v) inter-modulation distortion (IMD) may occur due to frequency separation between PUCCH and PUSCH and is set so that the first type of PUCCH cannot be transmitted, the terminal performs at least one of the operations according to Table 4 above.

[0193] Next, the case where the assigned PUCCH is a second type of PUCCH will be described. The second type of PUCCH has UCI (such as HARQ-ACK, RI, CSI, etc.) described with reference to FIG. 3 mapped thereto.

[0194] On one hand, the method for processing PUCCH includes the step of the terminal receiving a group common PDCCH including a slot configuration information indicator of a slot in which transmission of the second type of PUCCH is indicated, and the step of conditionally performing transmission of the second type of PUCCH. In this case, the terminal determines whether to perform transmission of the second type of PUCCH according to the conditions exemplified below.

[0195] As an example, the terminal transmits the second type of PUCCH based on the result of comparing the UL symbol according to the slot configuration in the slot in which transmission of the second type of PUCCH is indicated with the UL symbol assigned to the transmission of the second type of PUCCH. For example, if the UL symbol according to the slot configuration in the slot in which transmission of the second type of PUCCH is indicated is larger than (or greater than or equal to) the UL symbol required for the transmission of the second type of PUCCH, the terminal transmits the second type of PUCCH using the resources assigned in the slot.

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

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

[0198] As yet another example, the terminal compares the UL symbols, flexible symbols, and the UL symbols required for the transmission of the second type of PUCCH according to the slot configuration in the slot in which the transmission of the second type of PUCCH is indicated, and based on the result, transmits the second type of PUCCH, or drops or defers the transmission. For example, if the symbols including the UL symbols and flexible symbols according to the slot configuration in the slot in which the transmission of the second type of PUCCH is indicated are smaller than the UL symbols required for the transmission of the second type of PUCCH, the terminal abandons the transmission of the second type of PUCCH in the indicated slot. For example, if the slot in which the PUCCH transmission is indicated is a multi-slot, the terminal transmits the second type of PUCCH in a second slot that satisfies the number of UL symbols required for the second type of PUCCH transmission among the multi-slots. In contrast, if the slot in which the PUCCH transmission is indicated is a single slot, the terminal abandons or defers the scheduled transmission of the second type of PUCCH.

[0199] PUCCH processing method in a slot different from the indicated slot

[0200] The method for processing PUCCH according to this embodiment includes a step in which, if the configuration of the slot in which the PUCCH transmission is indicated is changed, the terminal performs transmission in different slots after the indicated slot. That is, if the UL symbols carrying the PUCCH within the slot to which the PUCCH is assigned overlap with the DL symbols within the slot according to the changed slot configuration, the terminal postpones (postpone or defer) the transmission of the PUCCH to a different slot where the PUCCH can be transmitted instead of the indicated slot.

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

[0202] First, if the allocated PUCCH is the first type of PUCCH, the processing method of PUCCH under conflicting slot configurations will be described. Here, the first type of PUCCH includes UCI described with reference to FIG. 3, particularly HARQ-ACK, RI, CSI, etc. Since the information mapped to the first type of PUCCH is UCI, the present invention includes embodiments in which the term of the first type of PUCCH is replaced with UCI in all embodiments of this specification.

[0203] FIG. 14 is a diagram showing an example of transmitting PUCCH to another slot due to a change in slot configuration.

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

[0205] That is, if the base station changes the configuration of the slot in which the first type of PUCCH is allocated, and the terminal successfully receives the group-shared PDCCH and terminal-specific PDCCH including the information of the slot configuration, but the slot configuration is a slot that cannot transmit the first type of PUCCH, the terminal does not transmit the first type of PUCCH in the slot, but transmits the first type of PUCCH in the nearest slot capable of transmitting the first type of PUCCH among the subsequent slots.

[0206] On the one hand, referring to FIG. 14(b), the terminal recognizes that the base station has changed the slot configuration to a slot configuration in which the first type of PUCCH (Long PUCCH) cannot be transmitted, through receiving a group common PDCCH and / or a terminal-specific PDCCH that notifies the change in the slot configuration, and the UL symbol mainly occupied by the first type of PUCCH allocated to slot N. In this case, the terminal does not transmit the first type of PUCCH in slot N, but transmits the second type of PUCCH (Short PUCCH) in slot N+K. In the delayed slot N+K, the second type of PUCCH, which is a different type from the allocated first type of PUCCH, is transmitted. That is, in the delayed slot N+K, the second type of PUCCH, which is a type different from the allocated first type of PUCCH, is transmitted. Here, slot N+K is the nearest slot capable of transmitting the second type of PUCCH and is a slot mainly occupied by DL symbols.

[0207] That is, if the base station changes the configuration of the slot to which the first type of PUCCH is allocated, and the terminal successfully receives the group common PDCCH and the terminal-specific PDCCH including the slot configuration information, but the slot configuration is a slot in which the first type of PUCCH cannot be transmitted, the terminal does not transmit the first type of PUCCH in the slot, but transmits the second type of PUCCH in the nearest slot capable of transmitting the second type of PUCCH among the subsequent slots.

[0208] Here, the UCI transmitted via the second type of PUCCH includes only a part of the UCI originally scheduled for transmission according to its importance, and does not include the remaining part.

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

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

[0211] In yet another aspect, if the information transmitted by the first type of PUCCH includes information of the primary serving cell (PCell) and the secondary serving cell (SCell), the terminal can 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 the UCI related to the primary serving cell via the second type of PUCCH. As another example, if the information transmitted by the first type of PUCCH includes information of the primary serving cell or the primary secondary serving cell (PSCell), the terminal transmits only the UCI related to the primary serving cell or the primary secondary serving cell to the second type of PUCCH.

[0212] In still another aspect, the terminal preferentially transmits the UCI for the DL associated with the PUCCH-transmissible cell (e.g., SIB linked DL Cell) on each PUSCH group via the second type of PUCCH.

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

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

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

[0216] HARQ-ACK processing method in a slot different from the indicated slot

[0217] The method for processing HARQ-ACK from one aspect includes: the step of the base station changing the configuration of slot N to which PUCCH is allocated; the step of the terminal receiving group common PDCCH and / or terminal-specific PDCCH including information on the changed slot configuration; when the allocated PUCCH is not transmitted under the changed slot configuration (i.e., when the changed slot configuration conflicts with the allocated PUCCH), the step of the terminal delaying the HARQ-ACK information in the allocated PUCCH by K slots from slot N (i.e., N+K) and then transmitting the allocated PUCCH.

[0218] Here, the "allocated PUCCH" according to this embodiment may be a type 1 PUCCH or a type 2 PUCCH. Also, the value of K is determined by the time from PDSCH scheduling to PUCCH feedback at the base station. In the slot after slot N+K where PUCCH can be transmitted, no PUCCH for HARQ-ACK feedback of other terminals needs to be allocated. For example, if the terminal and the base station communicate with each other on an FDD (Frequency Division Duplex) basis, PUCCH for HARQ-ACK of other terminals does not need to be transmitted (or allocated) in the slots transmitted after 4 ms (common for 3GPP LTE, LTE-A, NR). The value of K is provided via an RRC signal.

[0219] The method for processing HARQ-ACK from another aspect includes: the step of the base station changing the configuration of slot N to which type 1 PUCCH is allocated; the step of the terminal receiving group common PDCCH and / or terminal-specific PDCCH including information on the changed slot configuration; when type 1 PUCCH cannot be transmitted but type 2 PUCCH can be transmitted under the changed slot configuration, the step of the terminal waiting for PUCCH reallocation by the base station without transmitting type 1 PUCCH.

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

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

[0222] [Also other embodiments] Still other embodiments of this specification relate to information on the slot configuration transmitted by the base station to the terminal and the operating methods of the terminal and the base station based on this information. The base station uses various information and procedures to notify the terminal of the information on the slot configuration. The information on the slot configuration includes various embodiments as follows.

[0223] Information on slot configuration On one side, the information regarding the slot configuration includes semi-static DL / UL assignment information. As an example, the base station transmits to the terminal cell-specific default slot format or semi-static DL / UL assignment information (or semi-static slot-format information (SFI)), and additionally transmits semi-static DL / UL assignment information to the terminal via a terminal-specific RRC message. On the other hand, 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 regarding whether each symbol in the corresponding slot is a DL symbol, a UL symbol, or a flexible symbol that is neither a DL symbol nor a UL symbol. Here, the terminal assumes that a symbol not indicated as a DL symbol or a UL symbol via the semi-static DL / UL assignment information (or default slot format) is indicated as "flexible".

[0224] On another side, the information regarding the slot configuration includes dynamic slot-format information (SFI) transmitted included in the group-shared PDCCH. The dynamic slot-format information indicates information regarding whether each symbol in the slot is a DL symbol, a UL symbol, or a flexible symbol that is neither a DL symbol nor a UL symbol. The flexible symbol may replace the gap or be used for other purposes other than the gap. The group-shared PDCCH through which the dynamic slot-format information is transmitted is scrambled with an SFI-RNTI. Whether the terminal monitors the dynamic slot-format information is set or indicated by an RRC message. A terminal not instructed to monitor by the RRC message does not monitor the dynamic slot-format information.

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

[0226] Symbol direction determination method and PUCCH processing method As described above, since there is a variety of information regarding the slot configuration, the terminal receives information regarding different types of slot configurations for the same slot. And the information regarding each slot configuration indicates different symbol directions in the same slot. In this case, the rules for how the terminal and the base station change or determine the symbol direction are as follows.

[0227] On one hand, the DL symbols and UL symbols of the semi-static DL / UL allocation information (or default slot format) do not change in direction due to the dynamic slot configuration information or 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 scheduling information. If at least one of the symbols assigned to the PUCCH 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 according to the length of the remaining symbols excluding the corresponding DL symbol and transmits it. Here, the assigned PUCCH may be a type 1 PUCCH or a type 2 PUCCH.

[0228] On the other hand, the direction of the flexible symbols set by the semi-static DL / UL allocation information (or default slot format) is determined or changed by the dynamic slot configuration information or scheduling information. If at least one of the symbols to which PUCCH is allocated overlaps with the flexible symbols of the semi-static DL / UL allocation information (or default slot format), the terminal determines whether to transmit the PUCCH according to the type of information (such as HARQ-ACK, RI, CSI, etc.) that the corresponding PUCCH transmits (i.e., UCI). In this embodiment, the PUCCH may be a type 1 PUCCH or a type 2 PUCCH.

[0229] As an example, if the information transmitted by the PUCCH includes HARQ-ACK for the PDSCH, the terminal transmits the PUCCH at the determined position regardless of the dynamic slot configuration information notified by the group common PDCCH. Here, the determined position is indicated by the DCI that schedules the PDSCH.

[0230] As another example, if the information transmitted by the PUCCH does not include HARQ-ACK for the PDSCH, the terminal transmits the PUCCH if the flexible symbol that overlaps 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 PUCCH is allocated is indicated as another symbol (such as a DL symbol or a flexible symbol) that is not a UL symbol by the dynamic slot configuration information, the terminal does not transmit the PUCCH. Or, if the terminal fails to receive the dynamic slot configuration information for the symbol to which PUCCH is allocated, the terminal does not transmit the PUCCH.

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

[0233] As an example, if PUCCH is triggered via DCI, the terminal transmits PUCCH at a determined position regardless of the dynamic slot configuration information. Here, the determined position is indicated by the DCI.

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

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

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

[0237] When iterative PUCCH overlaps with UL symbols Among the slots instructed to transmit the repetition PUCCH, if it is located in the UL symbol set with semi-static DL / UL allocation information (or default slot pattern) in each slot, the terminal transmits the PUCCH in that slot regardless of the reception of dynamic slot configuration information or scheduling information. Here, the directions of the DL symbol and UL symbol according to the slot configuration set by an RRC message such as semi-static DL / UL allocation information (or default slot pattern) do not change due to dynamic slot configuration information or scheduling information.

[0238] When iterative PUCCH overlaps with DL symbols If at least one of the symbols allocated to the repeated PUCCH in each of the slots indicated to transmit the repeated PUCCH overlaps with the DL symbol according to the semi-static DL / UL allocation information, the terminal either does not transmit the PUCCH in the corresponding slot, or changes the length of the PUCCH according to 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 overlaps with the DL symbol set according to the semi-static DL / UL allocation information (or default slot pattern) in one of the slots indicated to transmit the repeated PUCCH, the terminal does not transmit the repeated PUCCH not only in the corresponding slot but also in subsequent slots.

[0239] When iterative PUCCH overlaps with flexible symbols If at least one of the symbols allocated to the repeated PUCCH in each of the slots indicated to transmit the repeated PUCCH overlaps with the flexible symbol set according to the semi-static DL / UL allocation information, the terminal determines whether to transmit the repeated PUCCH by i) the type of information (i.e., UCI) transmitted by the repeated PUCCH (such as HARQ-ACK, RI, CSI, etc.), or ii) the signaling that triggers the PUCCH transmission, or iii) the dynamic slot configuration information. In this embodiment, the repeated PUCCH may be a type 1 PUCCH or a type 2 PUCCH.

[0240] On one hand, if at least one of the symbols allocated to the repeated PUCCH in each of the slots indicated to transmit the repeated PUCCH overlaps with the flexible symbol set according to the semi-static DL / UL allocation information, the terminal determines whether to transmit the repeated PUCCH according to the type of information (i.e., UCI) transmitted by the repeated PUCCH (such as HARQ-ACK, RI, CSI, etc.).

[0241] As an example, if the information transmitted by the repeated PUCCH includes the HARQ-ACK for the PDSCH scheduled by the PDCCH, the terminal transmits the repeated PUCCH at a determined position regardless of the dynamic slot configuration information notified by the group-shared PDCCH. Here, the determined position is indicated by the DCI that schedules the PDSCH.

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

[0243] As yet another example, among the slots indicated for transmitting the repeated PUCCH, if at least one of the symbols allocated for the repeated PUCCH in each slot 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 repeated PUCCH in that slot. Or, if the terminal fails to receive the dynamic slot configuration information for the symbol allocated for the repeated PUCCH, the terminal does not transmit the repeated PUCCH in that slot. Even if the repeated PUCCH cannot be transmitted in the corresponding slot, the terminal transmits the repeated PUCCH in the next slot if a certain condition (when the flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by the dynamic slot configuration information) is satisfied.

[0244] As yet another example, if the terminal does not transmit the repeated PUCCH in a certain slot for any reason (a symbol direction contradiction caused by the dynamic slot configuration information, or the terminal fails to receive the dynamic slot configuration information) among the slots indicated for transmitting the repeated PUCCH, the terminal does not perform repeated transmission of the PUCCH in the subsequent slots.

[0245] On the other hand, if at least one of the symbols to which repeated PUCCH is allocated overlaps with a flexible symbol set by semi-static DL / UL allocation among the symbols to which repeated PUCCH is allocated, the terminal determines whether to transmit the repeated PUCCH by signaling that triggers the transmission of the repeated PUCCH.

[0246] As an example, if the repeated PUCCH is triggered via DCI, the terminal transmits the repeated PUCCH at a determined position regardless of the dynamic slot configuration information. Here, the determined position is indicated by the DCI.

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

[0248] As yet another example, among the slots instructed to transmit the repeated PUCCH, if at least one of the symbols to which the repeated PUCCH is allocated in each slot 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 repeated PUCCH in that slot. Or, if the terminal fails to receive the dynamic slot configuration information for the symbol to which the repeated PUCCH is allocated, the terminal does not transmit the repeated PUCCH in that slot. Even if the repeated PUCCH cannot be transmitted in the corresponding slot, if the terminal satisfies a certain condition (when the flexible symbol overlapping with the repeated PUCCH is indicated as a UL symbol by the dynamic slot configuration information) in the next slot, the terminal transmits the repeated PUCCH in the next slot.

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

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

[0251] As an example, the K slots configured to transmit the repeated PUCCH do not necessarily have to be consecutive. For example, if the UE is configured to transmit the repeated PUCCH among the K slots, the UE repeats PUCCH transmission until the count of the actually transmitted slots (excluding the slots in which the repeated PUCCH is not transmitted) reaches K. (Repeating method 1)

[0252] As another example, the K slots configured to transmit the repeated PUCCH have to be consecutive. For example, if the UE is configured to transmit the repeated PUCCH among the K slots, the UE repeats PUCCH transmission until the count of the slots in which PUCCH transmission is attempted (including the slots in which the repeated PUCCH is not transmitted) from the slot N instructed to transmit the repeated PUCCH reaches K. That is, the UE that first attempts PUCCH transmission in slot N attempts PUCCH transmission up to slot (N+K−1), and does not transmit PUCCH any more in slot (N+K), even if the number of times (or slots) in which PUCCH is actually repeatedly transmitted is less than K. (Repeating method 2)

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

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

[0255] Referring to FIG. 15(a), when the terminal is configured (slot configuration by semi-static DL / UL allocation) to repeatedly transmit the first type of PUCCH 1500 over two slots, the state of the terminal transmitting the first type of PUCCH 1500 is shown. Here, the flexible symbol is changed to a DL symbol or a UL symbol according to dynamic slot configuration information or scheduling information of terminal-specific DCI. Assume that the symbols in which the first type of PUCCH 1500 is transmitted are symbols 8 to 13 within the slot. Here, one slot contains 14 symbols, and the symbol index ranges from 0 to 13.

[0256] Examining each slot configuration by 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 symbols and DL symbols are flexible symbols.

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

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

[0259] Figure 15(b) shows the slot in which the terminal attempts to transmit the first type of PUCCH 1500 using the above-described repetition method 2. Since the first type of PUCCH 1500 is configured to be repeatedly transmitted in two slots (K = 2), the terminal attempts to transmit the first type of PUCCH 1500 in slot 0 and slot 1. The terminal attempts to transmit the first type of PUCCH in slot 1, but cannot transmit the first type of PUCCH because it overlaps with the DL symbol due to the setting of the semi-static DL / UL allocation information.

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

[0261] [Further other embodiments] Still other embodiments of the present invention relate to a method for a terminal or a base station to transmit a physical channel and a related determination procedure in a wireless communication system based on a slot configuration including TDD-based DL symbols, flexible symbols, and UL symbols in order to improve the coverage of the physical channel. The physical channel transmitted by the terminal is an uplink physical channel, including PRACH, PUCCH, PUSCH, SRS, etc. The physical channel transmitted by the base station is a downlink physical channel, including PDSCH, PDCCH, PBCH, etc. Hereinafter, the procedures of the terminal and the base station regarding the repeated transmission of PUCCH are defined, the procedures of the terminal and the base station regarding the repeated transmission of PUSCH are defined, and the procedures of the terminal and the base station regarding the method followed by the repeated transmission of PDSCH are defined. In the following embodiments, the PUCCH or the repeated PUCCH is the first type of PUCCH or the second type of PUCCH.

[0262] Terminal and base station procedures regarding iterative 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 predetermined number of values (i.e., 1, 2, 4, 8), and the value set for the actual terminal among the above-mentioned number of values is transmitted by an RRC message. If the number of repetitions of the PUCCH transmission is set to 1, it will indicate a general PUCCH instead of a repeated PUCCH.

[0263] The start and length of the symbol in which the PUCCH is transmitted within a slot are set to be included in one PUCCH resource set by an RRC parameter. A PUCCH resource set including at least one PUCCH resource is set or allocated to the terminal by RRC signaling. On the other hand, the base station indicates the at least one PUCCH resource index among the PUCCH resource sets to the terminal by dynamic signaling (i.e., DCI). 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 method. Here, the PRI is 2 bits or 3 bits.

[0264] The PUCCH resource set or PUCCH resource index configured as such is also maintained over a number of slots in which the PUCCH is repeatedly transmitted. The terminal determines whether to transmit the PUCCH indicated by the DCI. Such 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 (TDD-UL-DL-ConfigurationCommon) indicated by RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) additionally indicated to the terminal by RRC signaling.

[0265] As an example, the UL-DL configuration common information indicates the period for applying the semi-static DL / UL allocation information, and indicates the number of DL symbols, the number of UL symbols, and the number of flexible symbols configured over a plurality of slots included in the period.

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

[0267]

[0268] In each slot in which PUCCH transmission is indicated by the base station, if the symbol in which the PUCCH is transmitted overlaps with the symbol(s) indicated by the semi-static UL / DL allocation information (at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information), the terminal determines whether to transmit the PUCCH based on the direction of the indicated symbol(s).As an example, if the indicated symbol(s) is / are DL symbol(s), the terminal defers the PUCCH transmission to the next slot. If one of the indicated symbol(s) is / are 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 / are a DL symbol(s) or a flexible symbol(s), the terminal defers the PUCCH transmission to the next slot. If the indicated symbol is / are a UL symbol(s), the terminal transmits the PUCCH in the corresponding slot. The PUCCH not transmitted in the corresponding slot is deferred to the next slot.

[0270] The terminal repeatedly transmits the PUCCH until the number of repetitions of the PUCCH transmission configured by the RRC message on multiple slots is reached. When determining the slots for PUCCH transmission on multiple slots, the terminal considers the UL symbols and Unkown (or flexible) symbols based on the information transmitted in the RRC message. As an example, the terminal determines the slots including the UL symbols and flexible symbols configured by the RRC message for the PUCCH start position and the number of UL symbols as the slot resources for PUCCH transmission. Then, the base station receives the PUCCH that the terminal repeatedly transmits via 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 among the symbols in which PUCCH is transmitted in the first slot of the slots allocated for repeated PUCCH transmission overlaps with a DL symbol, the terminal cancels the PUCCH transmission without transmitting the PUCCH in the corresponding slot. That is, if the symbols in which PUCCH is transmitted in the first slot of the slots allocated for repeated PUCCH transmission are composed of UL symbol(s) and flexible symbol(s), the terminal transmits the PUCCH in the corresponding slot. Also, if at least one symbol among the symbols in which PUCCH is transmitted after the PUCCH transmission in a slot after the first slot of the slots allocated for repeated PUCCH transmission overlaps with a DL symbol or a flexible symbol, the terminal cancels the PUCCH transmission without transmitting the PUCCH in the corresponding slot. That is, if the slot in which PUCCH transmission is instructed by the base station in a slot after the first slot of the slots allocated for repeated PUCCH transmission, and the symbols of the slot that are instructed to transmit the PUCCH are composed of UL symbol(s), the terminal transmits the PUCCH in the corresponding slot.

[0272] Hereinafter, a method for processing PUCCH related to gap symbols will be disclosed.

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

[0274] In each slot in which PUCCH transmission is indicated by the base station, if the symbol(s) in which the PUCCH is to be transmitted overlap(s) with the symbol(s) constituted 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 type (or direction) of the indicated symbol(s).

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

[0276] That is, in the slot in which PUCCH transmission is indicated by the base station, if the symbol in which the PUCCH is to be transmitted is a UL symbol, the terminal transmits the PUCCH. If the symbol in which the PUCCH is to be transmitted overlaps with a DL symbol or at least one of the next G consecutive flexible symbol(s) immediately following the DL symbol, the terminal does not transmit the PUCCH in the corresponding slot. The terminal defers the PUCCH not transmitted in the corresponding slot to the next slot. That is, if the PUCCH overlaps with any one of the DL symbol and the G symbols available as a gap, the transmission is not performed and is deferred to the next slot.

[0277] On the other hand, regarding the PUCCH processing method in multiple slots, the terminal repeatedly transmits the PUCCH until the number of repetitions of the PUCCH transmission constituted by the RRC message on the multiple slots is reached. The terminal determines the slot for PUCCH transmission on the multiple slots based on the type and number of symbols according to the 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 semi-static UL / DL allocation information. For example, if "the number of UL symbols + the number of flexible symbols - the number of gap symbols" within 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. Or, considering that one slot includes 14 symbols, if "14 - (the number of DL symbols + the number of gap symbols) within the 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.

[0279] In this case, the base station receives the PUCCH that the terminal repeatedly transmits via 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 the availability of PUCCH transmission according to the slot configuration.

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

[0282] PUCCH allocation #0 is set with PUCCH resources from the 8th symbol to the 14th symbol, PUCCH allocation #1 is set with PUCCH resources from the 7th symbol to the 14th symbol, and PUCCH allocation #3 is set with PUCCH resources from the 6th symbol to the 14th symbol.

[0283] First, FIG. 16(a) shows the case where there is one symbol as a gap (G = 1). If G = 1, PUCCH allocation #0 and PUCCH allocation #1 that do not overlap with the next flexible symbol immediately following the DL symbol can be transmitted, but PUCCH allocation #2 that overlaps with the next 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 makes a judgment based on the same criteria regarding the transmission feasibility of PUCCH allocation #2 in the next slot.

[0284] FIG. 16(b) shows the case where there are two symbols as a gap (G = 2). If G = 2, PUCCH allocation #0 that does not overlap with the next two consecutive or flexible symbols immediately following the DL symbol can be transmitted, but PUCCH allocation #1 and PUCCH allocation #2 that overlap with the next two consecutive flexible symbols immediately following the DL symbol cannot be transmitted. In this case, the transmissions of PUCCH allocations #1 and #2 are postponed to the next slot. Of course, the terminal also makes a judgment based on the same criteria regarding the transmission feasibility of PUCCH allocations #1 and #2 in the next slot.

[0285] Terminal and base station procedures regarding iterative transmission of PUSCH The number of slots in which PUSCH is transmitted or the number of repetitions of PUCCH transmission is, for example, one of a predetermined number of values (i.e., 1, 2, 4, 8), and the value set for the actual terminal among the said number of values is transmitted by an RRC message. If the number of repetitions of PUSCH transmission is set to 1, it will indicate a general PUSCH instead of a repeated PUSCH.

[0286] In the case of PUSCH, PUSCH is transmitted only in a slot configuration that conforms to the PUSCH transmission among K consecutive slots, and no postponement operation of PUSCH transmission is performed.

[0287] The start and length of the symbol in which PUSCH is transmitted within a slot are indicated by DCI and are maintained the same for all slots. The terminal determines whether to transmit the PUSCH indicated by DCI. Such 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 the UL-DL configuration common information indicated by RRC signaling and the UL-DL configuration dedicated information additionally indicated to the terminal by RRC signaling.

[0288] As an example, the UL-DL configuration common information indicates the period for applying the semi-static DL / UL allocation information, and is 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 slot format, and is used to set the number of slots. That is, the terminal configures the slot format per slot over the number of slots indicated by the UL-DL configuration common information. As another example, the UL-DL configuration dedicated information includes information for replacing flexible symbols within the semi-static DL / UL slot configuration provided by the UL-DL configuration common information with UL symbols, DL symbols, and flexible symbols. That is, the terminal replaces flexible symbols within the slot format provided by the UL-DL configuration common information with other types of symbols based on the UL-DL configuration dedicated information.

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

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

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

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

[0293] Hereinafter, a method for processing PUSCH with respect to gap symbols will be disclosed.

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

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

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

[0297] That is, in the slot where PUSCH transmission is indicated by the base station, if the symbol in which the PUSCH is transmitted is a UL symbol, the terminal transmits the PUSCH. If at least one of the symbols in which the PUSCH is transmitted overlaps with at least one of the DL symbol or the next G consecutive flexible symbol(s) immediately following the DL symbol, the terminal cancels the transmission of the PUSCH without transmitting it. That is, if the PUSCH overlaps with any one of the DL symbol and the G symbols that can be used as the gap, the transmission of the PUSCH is not performed and the transmission of the PUSCH is cancelled.

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

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

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

[0301] In a slot in which PDSCH reception is instructed by a base station, if the symbol(s) in which the terminal receives the PDSCH overlap with the symbol(s) indicated 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 receive the PDSCH based on the type (or direction) of the indicated symbol(s).

[0302] As an example, if at least one of the indicated symbol(s) is a UL symbol, the terminal does not receive the PDSCH. On the contrary, if the indicated symbol(s) are DL symbol(s) and 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 Unkown (or flexible symbol(s)), the terminal does not receive the PDSCH. On the contrary, if the indicated symbol(s) are DL symbols, the terminal receives the PDSCH in the corresponding slot.

[0304] If at least one symbol among the symbols in which PDSCH is received in the first slot of the slots in which repeated PDSCH reception is indicated overlaps with a UL symbol, the terminal does not receive PDSCH in the corresponding slot. That is, if the symbols in which PDSCH is received in the first slot of the slots in which repeated PDSCH reception is indicated are composed of DL symbol(s) and flexible symbol(s), the terminal receives PDSCH in the corresponding slot. Also, if at least one symbol among the symbols in which PDSCH is received in a slot after the first slot of the slots in which repeated PDSCH reception is indicated overlaps with a UL symbol or a flexible symbol, the terminal does not receive PDSCH in the corresponding slot. That is, if the slot in which PDSCH reception is indicated by the base station in a slot after the first slot of the slots in which repeated PDSCH reception is indicated, and the symbols of the slot are composed of DL symbol(s) as the symbols in which PDSCH is to be transmitted are indicated, the terminal receives PDSCH in the corresponding slot. On the other hand, the terminal receives the PDSCH that could not be received additionally in the next slot that has been postponed.

[0305] Hereinafter, a method for processing PDSCH regarding gap symbols will be disclosed.

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

[0307] In a slot in which PDSCH reception is indicated by a base station, if the symbol(s) in which the PDSCH is received overlap(s) with the symbol(s) indicated by semi-static UL / DL allocation information (at least one of UL-DL configuration shared 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(s).

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

[0309] That is, in a slot in which PDSCH reception is indicated by a base station, if the symbol in which the PDSCH is received is a DL symbol, the terminal receives the PDSCH, and if at least one of the symbol in which the PDSCH is received overlaps with a UL symbol or G consecutive flexible symbol(s) immediately before the UL symbol, the terminal does not receive the PDSCH. That is, if the symbol in which the PDSCH is transmitted overlaps with any one of the G symbols that can be used as a gap with the UL symbol, the PDSCH is not transmitted and the transmission of the PDSCH is cancelled. Then, the base station defers the transmission of the PDSCH to the next slot.

[0310] On the other hand, if the terminal cancels the reception of the PDSCH based on the semi-static DL / UL allocation information, the HARQ-ARQ timing may be changed, so it is necessary to define a new HARQ-ARQ timing setting method.

[0311] On one side, if the reception of PDSCH is cancelled, the new HARQ-ARQ timing is determined by the received PDSCH without being cancelled. That is, in order for the terminal to determine the slot in which the actual HARQ-ACK is transmitted, the terminal uses the HARQ-ACK timing included in the DCI indicating the reception of PDSCH and the last received PDSCH excluding the cancelled PDSCH. For example, a terminal instructed with 4 slots as the HARQ-ACK timing transmits the HARQ-ACK 4 slots after the slot in which the last PDSCH was received.

[0312] On the other side, even if the reception of PDSCH is cancelled, the HARQ-ARQ timing is determined assuming that the PDSCH is received without being changed. That is, in order for the terminal to determine the slot in which the actual HARQ-ACK is transmitted, the terminal uses the HARQ-ACK timing included in the DCI indicating the reception of PDSCH and the one calculated based on the last PDSCH before determining whether cancellation is possible. For example, a terminal instructed with 4 slots as the HARQ-ACK timing transmits the HARQ-ACK 4 slots after the last slot of the allocated PDSCH even if the reception of the PDSCH is cancelled.

[0313] On the one hand, the terminal is configured to perform inter-slot frequency hopping for frequency diversity. Therefore, even when the terminal repeatedly transmits PUCCH (or PDSCH, PUSCH) in a plurality of slots, it is necessary to define how the terminal performs inter-slot frequency hopping. In this embodiment, when performing inter-slot frequency hopping, it discloses in which physical resource block (PRB) of each slot PUCCH (or PDSCH, PUSCH) is transmitted. Further, this embodiment discloses an algorithm for determining the PRB based on the difference between the current slot and the slot in which PUCCH was first transmitted regardless of the number of PUCCH repetition transmissions.

[0314] On one side, the inter-slot frequency hopping method during PUCCH transmission includes the step of the terminal determining the resource block (RB) for transmitting PUCCH based on the index of the first slot and the index of the second slot where the repeated PUCCH is first transmitted. Here, for slot n s the RB where PUCCH is transmitted or the starting RB index of the RB is obtained by Equation 7.

[0315]

Equation

[0316] In Equation 7, RB1 and RB2 are respectively the starting RB indices of the first hop and the second hop, which are signaled to the terminal and configured for the terminal via the RRC message. n s、0 is the index of the slot where PUSCH is first transmitted. This method is transmitted via only one hop during repeated transmission of PUSCH due to the delay of the repeated PUCCH.

[0317] On another side, the inter-slot frequency hopping method during PUCCH transmission includes the step of the terminal hopping each time it actually transmits the repeated PUCCH. The RB is determined by the slot index where PUCCH is transmitted and the actual number of repetitions. More specifically, for slot n s the RB where PUCCH is transmitted or the starting RB index of the RB is obtained by Equation 8.

[0318]

Equation

[0319] In Equation 8, RB1 and RB2 are respectively the starting RB indices of the first hop and the second hop, which are signaled to the terminal and configured for the terminal via the RRC message. n repeat (ns ) is slot n s It is the number of retransmission times of the previous PUCCH. In this method, the PUCCH is transmitted via two different hops regardless of the delay of the repeated PUCCH.

[0320] [Further other embodiments] In this specification, further other embodiments disclose a method for determining through which slot among a large number of slots PUCCH retransmission is performed, in addition to the method and determination procedure for repeatedly transmitting the PUCCH over a plurality of slots to improve the coverage of the PUCCH.

[0321] Hereinafter, a method for a terminal to determine a slot for PUCCH transmission among a large number of slots is disclosed.

[0322] On one hand, the terminal determines a slot for PUCCH transmission based on a synchronization signal for RRM (radio resource management) measurement and an SS / PBCH block including information related to initial cell access. The SS / PBCH block may be transmitted at a determined position, and the setting regarding 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 for the terminal. In the slot indicated by the setting regarding the transmission of the SS / PBCH block, there are flexible symbols in which the transmission of the SS / PBCH block is possible. That is, the flexible symbols are used not only for transmitting the PUCCH but also for transmitting the SS / PBCH block including information related to synchronization and initial cell access. In this case, it is possible that at least a part of the flexible symbol(s) in which the SS / PBCH block is transmitted overlaps with the flexible symbol(s) in which PUCCH transmission is possible.

[0323] As an example, the terminal determines the slot for repeated PUCCH transmission in a manner that excludes the slot containing the overlapping symbol from the slots for repeated PUCCH transmission, thereby preventing collisions. In this way, if the terminal determines a number of slots for transmitting PUCCH based on SSB_transmitted - SIB1 and SSB_transmitted and repeatedly transmits PUCCH over the number of slots, the base station receives the repeated PUCCH from the terminal.

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

[0325] Hereinafter, in this specification, it is assumed that the gap is located in the symbol immediately before the symbol for PUCCH transmission, and it is assumed that the gap includes one or two symbols for explanation. However, the position and the number of symbols of the DL-UL switching gap between DL and UL can be set in various ways 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 considering two or more gap symbols, or determines whether PUCCH transmission can be postponed.

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

[0327] As an example, to determine PUCCH transmission resources using flexible symbols, if the symbol immediately preceding the flexible symbol is a DL symbol(s) and PDSCH is allocated 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 other UL symbols 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 PDSCH is not allocated to the DL symbol(s), the flexible symbol becomes an unallocated symbol. Therefore, the terminal does not regard the unallocated symbol as a gap for DL-UL switching. Then, the terminal regards 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 PUCCH transmission resources using flexible symbols, if the symbol immediately preceding the flexible symbol is a DL symbol(s) and a CORESET or a search space for PDCCH monitoring is allocated to the DL symbol(s), the terminal excludes the slot including the flexible symbol from the slot for repeated PUCCH transmission in order to perform the allocated PDCCH monitoring.

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

[0330] As yet another example, the terminal determines a slot for PUCCH transmission using semi-static DL / UL allocation information. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUCCH should be transmitted. If at least one of the symbols in which PUCCH transmission is indicated overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information, and the symbol immediately preceding the symbol in which PUCCH transmission is indicated is not a DL symbol indicated by the semi-static DL / UL allocation information, the terminal determines the corresponding slot as a slot for repeated PUCCH transmission and transmits PUCCH in the corresponding slot. In contrast, if the symbol immediately preceding the symbol in which PUCCH is transmitted is a DL symbol indicated by the semi-static DL / UL allocation information, the terminal does not transmit repeated PUCCH in the corresponding slot and defers PUCCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUCCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if the symbol immediately preceding the symbol in which PUCCH is transmitted is a DL symbol of the semi-static DL / UL allocation information, the terminal does not transmit PUCCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0331] As yet another example, the terminal determines a slot for PUCCH transmission by using the information scheduled for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUCCH should be transmitted. If at least one of the symbols in which PUCCH transmission is indicated overlaps with a flexible symbol indicated by semi-static DL / UL allocation information and no PDSCH is scheduled in the symbol immediately preceding the symbol in which PUCCH transmission is indicated, the terminal determines the corresponding slot as the slot for PUCCH transmission and transmits PUCCH in the corresponding slot. On the other hand, if a PDSCH is scheduled in the symbol immediately preceding the symbol in which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot and defers PUCCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUCCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or a PDSCH is scheduled in the symbol immediately preceding the symbol in which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0332] As yet another example, the terminal determines a slot for PUCCH transmission by using CSI-RS information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUCCH should be transmitted. If at least one of the symbols in which PUCCH transmission is instructed overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and CSI-RS reception is not configured for the symbol immediately preceding the symbol in which PUCCH transmission is instructed, the terminal determines the corresponding slot as the slot for PUCCH transmission and transmits PUCCH in the corresponding slot. On the other hand, if CSI-RS reception is configured for the symbol immediately preceding the symbol in which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot and defers PUCCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUCCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if CSI-RS reception is configured for the symbol immediately preceding the symbol in which PUCCH is transmitted, the terminal does not transmit PUCCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0333] As yet another example, the terminal determines a slot for PUCCH transmission by using the PDCCH monitoring information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot the PUCCH should be transmitted. If at least one of the symbols in which the PUCCH transmission is indicated overlaps with a flexible symbol in the semi-static DL / UL allocation information and PDCCH monitoring is not configured (or allocated) for the symbol immediately preceding the symbol in which the PUCCH transmission is indicated, the terminal determines the corresponding slot as the slot for PUCCH transmission and transmits the PUCCH in the corresponding slot. On the other hand, if PDCCH monitoring is configured (or allocated) for the symbol immediately preceding the symbol in which the PUCCH is transmitted, the terminal does not transmit the PUCCH in the corresponding slot and defers the PUCCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which the PUCCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol in the semi-static DL / UL allocation information or PDCCH monitoring is configured for the symbol immediately preceding 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 deferred to be transmitted in the next available slot.

[0334] As another example, the terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUCCH should be transmitted. If at least one of the symbols in which PUCCH transmission is instructed overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and the symbol immediately before the symbol in which PUCCH transmission is instructed does not overlap with an SS / PBCH block, the terminal determines the corresponding slot as the slot for PUCCH transmission and transmits PUCCH in the corresponding slot. On the other hand, if the symbol immediately before the symbol in which PUCCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit PUCCH in the corresponding slot and defers PUCCH transmission to the next available slot. In other words, the terminal knows, from an RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUCCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of semi-static DL / UL allocation information, or if the symbol immediately before the symbol in which PUCCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit PUCCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0335] As an embodiment of the present invention, since the DL-UL switching gap between DL and UL is variably set according to the settings of the base station and the terminal, in the present invention, when considering the symbol immediately before the symbol for PUCCH transmission, mainly at least one symbol is taken as an example to explain the PUCCH transmission and whether it can be deferred. However, since the DL-UL switching gap is variably set according to the settings of the base station and the terminal, the number of corresponding symbols is diverse. For example, the PUCCH transmission and whether it can be deferred may be determined by considering one or more symbols.

[0336] In this embodiment, if the symbol indicated by Dynamic SFI in one slot ends with the symbol immediately before the symbol for repeated PUCCH transmission and the PUCCH resource is set such that transmission for repeated PUCCH is performed starting from the next symbol, the terminal defers to a subsequent slot without transmitting PUCCH in that slot. The deferred slot is the earliest slot among the slots in which the PUCCH is transmitted.

[0337] The method by which a terminal determines a slot for PUCCH transmission according to the availability of PDSCH allocation within a slot will be described below through more specific examples. Here, it is assumed that one slot contains 14 symbols.

[0338] For example, assume that the UL symbol resources for PUCCH are set to the last 12 symbols and that a specific slot sequentially includes two DL symbols, two flexible symbols, and 10 UL symbols. If PDSCH is allocated to the two DL symbols immediately before the two flexible symbols, the terminal implicitly regards the first flexible symbol as a DL-UL switching gap. Then, the terminal determines whether it can select the remaining one flexible symbol and the 10 UL symbols excluding the first flexible symbol as PUCCH resources. However, since the UL symbol resources for PUCCH are set to the last 12 symbols of the slot, the terminal excludes the slot from the slot resources for PUCCH transmission. In the above example, if the UL symbol resources for PUCCH are 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 resources for PUCCH are set in the last six symbols, and a specific slot sequentially includes eight DL symbols, two flexible symbols, and four UL symbols. If PDSCH is allocated to the previous eight DL symbols, the terminal implicitly regards the first flexible symbol as a DL-UL switching gap. Then, the terminal determines whether it can select the remaining one flexible symbol and the four UL symbols except the first flexible symbol as PUCCH resources. However, since the UL symbol resources for PUCCH are set in the last six symbols of the slot, the terminal excludes the said slot from the slot resources for PUCCH transmission. In the said example, if the UL symbol resources for PUCCH are set in the last five symbols of the slot, the terminal determines the said slot as the slot resources for PUCCH transmission.

[0339] [Further Other Embodiments] In this specification, further other embodiments disclose a method for determining through which slot among a number of slots PUSCH iterative transmission is to be performed, in addition to a method and a determination procedure for repeatedly transmitting PUSCH over a plurality of slots to improve the coverage of PUSCH.

[0340] On the other hand, the determination of the slot for transmitting PUSCH is based on at least one of the availability of PDSCH allocation within the slot, the availability of allocation of a control resource set for PDCCH monitoring to DL symbols within the slot, the availability of CSI-RS allocation within the slot, the availability of SS / PBCH block allocation within the slot, and semi-static DL / UL allocation information.

[0341] As an example, the terminal determines a slot for PUSCH transmission using semi-static DL / UL allocation information. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUSCH should be transmitted. If the symbol in which PUSCH transmission is indicated overlaps with the flexible symbol indicated by the semi-static DL / UL allocation information and the symbol immediately preceding the symbol in which PUSCH transmission is indicated is not a DL symbol indicated by the semi-static DL / UL allocation information, the terminal determines the corresponding slot as the slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the contrary, if the symbol immediately preceding the symbol in which PUSCH is transmitted is a DL symbol indicated by the semi-static DL / UL allocation information, the terminal does not transmit PUSCH in the corresponding slot and defers PUSCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUSCH is transmitted for each slot, and if at least one of those symbols overlaps with the DL symbol of the semi-static DL / UL allocation information or the symbol immediately preceding the symbol in which PUSCH is transmitted is a DL symbol of the semi-static DL / UL allocation information, the terminal does not transmit PUSCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0342] As another example, the terminal determines a slot for PUSCH transmission by using the information scheduled for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUSCH should be transmitted. If at least one of the symbols in which PUSCH transmission is indicated overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and if PDSCH is not scheduled in the symbol immediately preceding the symbol in which PUSCH transmission is indicated, the terminal determines the corresponding slot as the slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the contrary, if PDSCH is scheduled in the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot and defers PUSCH transmission to the next available slot. In other words, the terminal knows, for each slot, the symbol in which PUSCH is transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if PDSCH is scheduled in the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot; otherwise, the terminal transmits 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 deferred to be transmitted in the next available slot.

[0343] As another example, the terminal determines a slot for PUSCH transmission by using CSI-RS information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUSCH should be transmitted. If at least one of the symbols indicated for PUSCH transmission overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and CSI-RS reception is not configured for the symbol immediately preceding the symbol indicated for PUSCH transmission, the terminal determines the corresponding slot as a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the contrary, if CSI-RS reception is configured for the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUSCH is transmitted for each slot, and if at least one of those symbols overlaps with the DL symbol of the semi-static DL / UL allocation information, or if CSI-RS reception is configured for the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot; otherwise, the terminal transmits 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 yet another example, the terminal determines a slot for PUSCH transmission by using the PDCCH monitoring information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUSCH should be transmitted. If at least one of the symbols in which PUSCH transmission is indicated overlaps with a flexible symbol indicated by semi-static DL / UL allocation information and PDCCH monitoring is not configured (or allocated) for the symbol immediately preceding the symbol in which PUSCH transmission is indicated, the terminal determines the corresponding slot as the slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if PDCCH monitoring is configured (or allocated) for the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot. In other words, the terminal knows, for each slot, the symbol in which PUSCH is transmitted from the RRC message and / or dynamic signaling (e.g., PRI), and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or PDCCH monitoring is configured for the symbol immediately preceding the symbol in which PUSCH is transmitted, the terminal does not transmit PUSCH in the corresponding slot; otherwise, the terminal transmits 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 so as to be transmitted in the next available slot.

[0345] As yet another example, the terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot PUSCH should be transmitted. If at least one of the symbols in which PUSCH transmission is indicated overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and the symbol immediately preceding the symbol in which PUSCH transmission is indicated does not overlap with an SS / PBCH block, the terminal determines that the corresponding slot is a slot for PUSCH transmission and transmits PUSCH in the corresponding slot. On the other hand, if the symbol immediately preceding the symbol in which PUSCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit PUSCH in the corresponding slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which PUSCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if the symbol immediately preceding the symbol in which PUSCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit PUSCH in the corresponding slot; otherwise, the terminal transmits 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] As an example of the present invention, since the DL-UL switching gap between DL and UL is variably set according to the settings of the base station and the terminal, in the present invention, when considering the symbol immediately preceding the symbol for PUSCH transmission, mainly at least one symbol is taken as an example to explain the PUSCH transmission and whether it can be postponed. However, since the DL-UL switching gap is variably set according to the settings of the base station and the terminal, the number of corresponding symbols is diverse. For example, the PUSCH transmission and whether it can be postponed may be determined by considering one or more symbols.

[0347] [Further Other Embodiments] In this specification, still other embodiments disclose a method for determining through which slots among a number of slots PDSCH repeated transmission is to be performed, in addition to a method and a determination procedure for repeatedly transmitting PDSCH over a plurality of slots to improve the coverage of PDSCH.

[0348] On the other hand, the determination of the slot for receiving PDSCH is made based on at least one of the availability of PUSCH allocation, the availability of PUCCH allocation, the availability of SRS transmission allocation, the availability of PRACH transmission allocation, and semi-static DL / UL allocation information within the slot.

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

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

[0351] As another example, the terminal determines a slot for PDSCH transmission by using the CSI-RS information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot the PDSCH should be transmitted. If at least one of the symbols indicated for PDSCH reception overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and CSI-RS reception is not configured for the symbol immediately preceding the symbol indicated for PDSCH reception, the terminal determines the corresponding slot as the slot for PDSCH transmission and transmits the PDSCH in the corresponding slot. On the contrary, if CSI-RS reception is configured for the symbol immediately preceding the symbol in which the PDCCH is transmitted, the terminal does not transmit the PDSCH in the corresponding slot and defers the PDSCH transmission to the next available slot. In other words, the terminal knows the symbol in which the PDSCH is transmitted for each slot from the RRC message and / or dynamic signaling (e.g., PRI), and if at least one of those symbols overlaps with the DL symbol of the semi-static DL / UL allocation information, or if CSI-RS reception is configured for the symbol immediately preceding 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 deferred to be transmitted in the next available slot.

[0352] As yet another example, the terminal determines a slot for PDSCH transmission by using the PDCCH monitoring information configured for the terminal. The terminal knows, via an RRC message and dynamic signaling (e.g., PRI), in which symbol of which slot the PDSCH should be transmitted. If at least one of the symbols indicated for PDSCH reception overlaps with a flexible symbol indicated by semi-static DL / UL allocation information, and PDCCH monitoring is not configured (or allocated) for the symbol immediately preceding the symbol in which the PDSCH is to be transmitted, the terminal determines the corresponding slot as the slot for PDSCH transmission and transmits the PDSCH in the corresponding slot. In contrast, if PDCCH monitoring is configured (or allocated) for the symbol immediately preceding the symbol in which the PDSCH is to be transmitted, the terminal does not transmit the PDSCH in the corresponding slot and defers PDSCH transmission to the next available slot. In other words, the terminal knows, from the RRC message and / or dynamic signaling (e.g., PRI), the symbol in which the PDSCH is transmitted for each slot, and if at least one of those symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or PDCCH monitoring is configured for the symbol immediately preceding the symbol in which the PDSCH is to be 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 deferred 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 regarding the terminal. At this time, 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 the SS / PBCH block overlaps with that 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] As one embodiment of the present invention, since the DL-UL switching gap between DL and UL is variably set according to the settings of the base station and the terminal, in the present invention, when considering the symbol immediately following the symbol for PDSCH transmission, mainly at least one symbol is taken as an example to explain the PDSCH transmission and whether it can be postponed. However, since the DL-UL switching gap is variably set according to the settings of the base station and the terminal, the number of corresponding symbols varies. For example, the PDSCH transmission and whether it can be postponed may be determined by considering one or more symbols.

[0355] [Yet Another Embodiment] Yet another embodiment of the present specification relates to a situation where the interval between the DL symbol requiring downlink reception and the UL symbol requiring uplink transmission is insufficient, and the terminal cannot 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 the switching gap or simply the gap. These only differ in expression and have the same meaning.

[0356] The DL-UL switching gap can have different lengths depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or less (hereinafter referred to as frequency range (FR1) 1), a DL-UL switching gap of 13 μs is required. Or, when the carrier frequency is 6 GHz or more (hereinafter referred to as FR2), a DL-UL switching gap of 7 μs is required.

[0357] The DL-UL switching gap is also affected by the timing advance (TA) value and the TA offset value. Also, the DL-UL switching gap is 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 the duration of one symbol is X μs, the number of symbols (G) required for the DL-UL switching gap is given by G = ceil((Rx2Tx + Ta + TA_offset) / X). Here, Rx2Tx can have different values depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or less (FR1), Rx2Tx is 13 μs, and when it is 6 GHz or more (FR2), Rx2Tx is 7 μs. 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 for the base station. TA_offset is 39936*Tc or 25600*Tc in FR1 and 13792*Tc in FR2. Here, Tc = 1 / (480*103*4096). Here, the switching gap is the RF interference time.

[0358] Table 5 is an example of the number of symbols required for the DL-UL switching gap according to the subcarrier spacing.

[0359]

Table 5

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

[0361] [Table 6]

[0362] Hereinafter, a method for a terminal to process an uplink channel or an uplink signal based on a downlink signal received by the 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, and the like. Also, in this embodiment, the uplink channel includes a PUSCH, a PUCCH, a PRACH, and the like, and the uplink signal includes an SRS, a periodic signal, a measurement signal, and the like.

[0363] Symbols for SS / PBCH block transmission and uplink transmission On one hand, a method for a terminal to process uplink transmission includes determining whether at least one symbol among the symbols in which the transmission of the uplink channel or the uplink signal is instructed overlaps (i.e., conflicts) with a symbol in which the terminal is instructed to receive an SS / PBCH block from the base station (or a symbol for SS / PBCH block transmission), and transmitting the uplink channel or the uplink signal based on the determination. Here, if at least a part of the symbols in which the SS / PBCH block is received is set to overlap with the transmission of the uplink channel or the uplink signal, the terminal does not transmit the uplink channel or the uplink signal; otherwise, the terminal transmits the uplink signal.

[0364] On the other hand, a method for a terminal to handle uplink transmission includes a step of determining whether at least one symbol among symbols instructed for uplink channel transmission or uplink signal transmission is set to overlap with a symbol (or symbols) to which an SS / PBCH block instructed to be received from a base station is assigned, and a step of transmitting an uplink channel or an uplink signal based on the determination. Here, if at least a part of the G symbol(s) is set to overlap with uplink channel transmission or uplink signal transmission, the terminal does not transmit the uplink channel or the uplink signal; otherwise, it transmits the uplink signal.

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

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

[0367] On the other hand, this embodiment includes a step of performing scheduling (i.e., dynamic scheduling of layer 1 (L1)) so that symbols for downlink transmission and symbols for uplink transmission by the base station do not overlap. That is, when the base station performs scheduling for the terminal, uplink transmission based on the G symbol base is set. In this case, the terminal does not expect the base station to set the terminal's uplink transmission within the G symbol.

[0368] Further, this embodiment includes: when uplink transmission based on the RRC configuration base rather than dynamic scheduling of L1 is set, determining whether the uplink transmission configured by the RRC overlaps with the G symbol; and determining whether the terminal transmits an uplink channel or a signal based on the determination.

[0369] Hereinafter, a method for a terminal to process downlink reception and uplink channel (or uplink signal) transmission based on a DL-UL switching gap (G) is disclosed. In this embodiment, the downlink signal includes an SS / PBCH block, a PDSCH, a PDCCH, a CSI-RS, etc. Also, in this embodiment, the uplink channel includes a PUSCH, a PUCCH, a PRACH, etc., and the uplink signal includes an SRS, etc.

[0370] Downlink signal processing based on whether flexible symbols can overlap with uplink signals The terminal can or cannot receive a downlink signal (e.g., a downlink periodic signal or a measurement signal) constituted by a terminal-specific RRC message, which is composed of symbols constituted by semi-static DL / UL allocation information or symbols not constituted by semi-static DL / UL allocation information. In this case, the method for the terminal to process the configured downlink reception is based on the arrangement relationship (e.g., the overlapping relationship) between the DL-UL switching gap and the uplink signal.

[0371] On one hand, the method for the terminal to process the configured downlink reception includes a step 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 a step of receiving the configured downlink signal based on the determination. Here, if the determination result shows that there is no overlap with the uplink signal within G symbols after the last symbol of the configured downlink signal, the terminal receives the configured downlink signal. Conversely, if there is an overlap with the uplink signal within G symbols, the terminal does not receive the configured downlink signal. That is, if there are at least G gap symbols between the last DL symbol constituted by semi-static DL / UL allocation information and the first symbol allocated by the uplink signal within one slot, the terminal drops the downlink signal.

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

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

[0375] In another aspect, a method for a terminal to process the downlink reception includes determining whether the terminal overlaps with a UL symbol configured by semi-static DL / UL allocation information within G symbols after the last symbol of the downlink signal, and receiving the downlink signal based on the determination. As a result of the determination, if the terminal overlaps with a UL symbol configured by semi-static DL / UL allocation information within G symbols, the terminal does not receive the downlink signal; otherwise, the terminal receives the downlink signal. That is, if there are no less than G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information and the first symbol allocated by the uplink signal within one slot, the terminal drops the downlink signal.

[0376] In another aspect, a method for a terminal to process the configured downlink reception includes a step of determining whether the terminal overlaps with a UL symbol indicated by a dynamic SFI within G symbols after the last symbol of the configured downlink signal, and a step of receiving the configured downlink signal based on the determination. As a result of the determination, if it overlaps with the UL symbol indicated by the dynamic SFI within G symbols, the terminal does not receive the configured downlink signal; otherwise, it receives the downlink signal. That is, if there are less than at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information and the first symbol allocated by the uplink signal within one slot, the terminal drops the downlink signal.

[0377] In yet another aspect, a method for a terminal to process the configured downlink reception includes a step of determining whether the terminal overlaps with a UL symbol configured by semi-static DL / UL allocation information within G symbols before the first symbol of the uplink signal, and a step of receiving the configured downlink signal by the terminal based on the determination. As a result of the determination, if it overlaps with the DL symbol configured by semi-static DL / UL allocation information within G symbols, the terminal does not receive the configured downlink signal; otherwise, it receives the configured downlink signal. That is, if there are less than at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information and the first symbol allocated by the uplink signal within one slot, the terminal drops the downlink signal.

[0378] In still another aspect, a method for a terminal to process the configured downlink reception includes: determining whether the terminal overlaps with a DL symbol indicated by a dynamic SFI within G symbols before the first symbol of the uplink signal; and receiving the configured downlink signal by the terminal based on the determination. As a result of the determination, if there is an overlap with the DL symbol indicated by the dynamic SFI within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. That is, if there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL allocation information and the first symbol allocated by the uplink signal within one slot, the terminal drops the downlink signal.

[0379] Here, a method for a terminal to process uplink transmission includes: in a symbol configured by a flexible symbol according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, determining whether an uplink signal is configured between G symbols after a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message, or including an operation not expecting to be indicated by an L1 signal.

[0380] Uplink signal processing based on whether flexible symbols can overlap with downlink signals The terminal cannot transmit or is unable to transmit an uplink signal (e.g., uplink periodic signal or measurement signal) configured by a terminal-specific RRC message in a symbol configured by a flexible symbol according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information. In this case, a method for the terminal to process the configured uplink transmission is determined based on the arrangement relationship (e.g., overlapping relationship) between the DL-UL switching gap and the uplink signal.

[0381] On one side, a method for a terminal to process the configured uplink transmission 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 the 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 overlap with the downlink signal within G symbols, the terminal does not transmit the configured uplink signal. That is, if there are at least G gap symbols between the first DL symbol configured by semi-static DL / UL allocation information and the last symbol allocated by the downlink signal within one slot, the terminal drops the uplink signal.

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

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

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

[0385] In another aspect, a method for a terminal to process the configured uplink transmission includes determining whether to overlap with a UL symbol configured by semi-static DL / UL allocation information within G symbols(s) before the first symbol of the configured uplink signal, and based on the determination, the terminal transmitting the configured uplink signal. As a result of the determination, if there is no overlap with a DL symbol configured by semi-static DL / UL allocation information within G symbols(s), the terminal transmits the configured uplink signal; otherwise, the terminal does not transmit the configured uplink signal. That is, if there are at least G gap symbols between the first DL symbol configured by semi-static DL / UL allocation information and the last symbol allocated by the downlink signal within one slot, the terminal drops the uplink signal.

[0386] Here, the method by which the terminal processes downlink reception includes an operation where it does not expect a downlink signal to be configured between G symbols after a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message in a symbol configured by flexible symbols according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, or to be indicated by L1 signaling.

[0387] In a symbol configured by flexible symbols according to semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, if the number of symbols between the last symbol of the downlink signal configured by a cell-specific RRC message or indicated by L1 signaling and the first symbol of the uplink signal configured by a cell-specific RRC message or indicated by L1 signaling is smaller than G, the operation of the terminal is as follows.

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

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

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

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

[0392] As illustrated, a 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 the terminal described in the embodiments of this specification and performs the operations and procedures according to each embodiment of this specification. Specifically, the communication module 120 performs the operation of transmitting or receiving an object by the terminal according to each embodiment of this specification, and the processor 110 performs operations such as generation, determination, and decision of other objects.

[0393] First, the processor 110 executes various instructions or programs and processes the data inside the terminal 100. Also, the processor 1100 controls the overall operation including each unit of the terminal 100 and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform the operations according to the embodiments described in the present invention. For example, the processor 110 receives slot configuration information, determines the configuration of the slot based on it, 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, 122, and unlicensed band communication interface cards 123, in a built-in or external form. In the drawings, the communication module 120 is illustrated as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application, different from the drawings.

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

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

[0397] The unlicensed band communication interface card 123 transmits and receives radio signals with at least one of the base station 200, external device, and server via the third frequency band which is an unlicensed band, and provides an unlicensed band communication service based on the instructions of the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. 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, external device, and 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 the control program used in the terminal 100 and various data thereby. Such a control program includes a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external device, and server.

[0399] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface unit 140 receives the user's 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 an output based on the instructions of the processor 110 using various output means.

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

[0401] In addition, the base station 200 according to an embodiment of the present invention includes a processor 210, a communication module 220, and a memory 230. The base station 200 is the base station described in each embodiment of this specification, and performs the operations and procedures of the base station corresponding to the operations and procedures of the terminal according to each embodiment of this specification. Specifically, the communication module 220 performs the operation of receiving or transmitting an object by the base station according to each embodiment of this specification, and the processor 210 performs operations such as generation, determination, and decision of other objects.

[0402] First, the processor 210 executes various instructions or programs to process the data inside the base station 200. In addition, the processor 210 controls the overall operation including each unit of the base station 200, and controls the transmission and reception of data between the units. Here, the processor 210 is configured to perform the operations according to the embodiments described in this 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 in a built-in or external form. In the drawings, the communication module 220 is illustrated as an integrated module, but each network interface card may be arranged independently according to the circuit configuration or application, different from the drawings.

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

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

[0406] The unlicensed band communication interface card 223 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server via a third frequency band which is an unlicensed band, and provides a communication service in the unlicensed band based on an instruction from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. 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 a frequency band supported by the corresponding NIC module.

[0407] The terminal 100 and the base station 200 shown in FIG. 17 are block diagrams according to an embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-described elements of the device are mounted on one chip or a plurality of chips according to the design of the device. In addition, some configurations of the terminal 100, for example, the user interface unit 140 and the display unit 150, etc., may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150, etc., may be additionally provided in the base station 200 if necessary.

[0408] The above description of the present invention is for illustrative purposes, and those with ordinary knowledge in the technical field to which the present invention pertains should be able to understand that the present invention can be easily changed to other specific forms without changing the technical idea and essential features of the present invention. Therefore, the above-described embodiments are illustrative in all aspects and should be understood as being limited. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

[0409] The scope of the present invention is defined by the claims that follow, rather than by the detailed description given above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Explanation of Reference Numerals

[0410] 110 Processor 121 Cellular Communication Interface Card (First Frequency Band) 122 Cellular Communication Interface Card (Second Frequency Band) 123 Unlicensed Band Communication Interface Card (Third Frequency Band) 130 Memory 140 User Interface 150 Display Unit 210 Processor 221 Cellular Communication Interface Card (First Frequency Band) 222 Cellular Communication Interface Card (Second Frequency Band) 223 Unlicensed Band Communication Interface Card (Third Frequency Band) 230 Memory

Claims

1. A terminal for use in a wireless communication system, the terminal comprising: a communication module; a processor and; the processor is configured to: receive semi-static UL / DL configuration information related to a slot configuration sequentially including a downlink symbol, a flexible symbol, and an uplink symbol; when at least a part of the uplink resource is on the flexible symbol, determine whether the uplink resource is valid in the slot based on whether the uplink resource starts from at least G (non-negative integer) symbols after the last downlink symbol and whether it starts from at least G symbols after the last symbol of the synchronization signal / physical broadcast channel (SS / PBCH) block; when the uplink resource is valid in the slot, perform uplink transmission using the uplink resource configured terminal.

2. When the uplink resource starts from at least G symbols after the last downlink symbol and starts from at least G symbols after the last symbol of the SS / PBCH block, the uplink resource is valid in the slot The terminal according to claim 1.

3. The symbols for the SS / PBCH block are determined based on the parameters of the RRC (radio resource control) signal The terminal according to claim 1 or 2.

4. At least a part of the SS / PBCH block is on the flexible symbol The terminal according to any one of claims 1 to 3.

5. The semi-static UL / DL configuration information includes shared UL / DL configuration information The terminal according to any one of claims 1 to 4.

6. A method used by a terminal in a wireless communication system, the method comprising: receiving semi-static UL / DL configuration information related to a slot configuration sequentially including a downlink symbol, a flexible symbol, and an uplink symbol; When at least a part of the uplink resource is on the flexible symbol, the step of determining whether the uplink resource is valid in a slot based on whether the uplink resource starts from at least G (non - negative integer) symbols after the last downlink symbol and whether it starts from at least G symbols after the last symbol of the synchronization signal / physical broadcast channel (SS / PBCH) block; When the uplink resource is valid in the slot, the step of performing uplink transmission with the uplink resource A method comprising.

7. When the uplink resource starts from at least G symbols after the last downlink symbol and starts from at least G symbols after the last symbol of the SS / PBCH block, the uplink resource is valid in the slot The method according to claim 6.

8. The symbols for the SS / PBCH block are determined based on the parameters of the RRC (radio resource control) signal The method according to claim 6 or 7.

9. At least a part of the SS / PBCH block is on the flexible symbol The method according to any one of claims 6 to 8.

10. The semi - static UL / DL configuration information includes shared UL / DL configuration information The method according to any one of claims 6 to 9.

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