Method, apparatus, and system for transmitting uplinks and receiving downlinks in wireless communication systems.

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, apparatus, and systems for transmitting uplink signals and channels and receiving downlink signals and channels in a wireless communication system. [Background technology]

[0002] Following the commercialization of 4G (4th generation) communication systems, efforts are being made to develop new 5G (5th generation) communication systems to meet the increasing demand for wireless data traffic. 5G communication systems are also referred to as "beyond 4G network" systems, "post-LTE" systems, or "NR (new radio)" systems. To achieve high data transmission rates, 5G communication systems include systems operating in ultra-high frequency (mmWave) bands above 6 GHz, as well as systems operating in frequency bands below 6 GHz to ensure coverage, with implementation at base stations and terminals being considered.

[0003] The 3GPP® (registered trademark, hereinafter the same) (3rd generation partnership project) NR system improves the efficiency of the network spectrum, enabling telecommunications carriers to provide more data and voice services with the given bandwidth. Therefore, the 3GPP NR system is designed to meet the demands for high-speed data and media transmission in addition to high-capacity voice support. The advantages of the NR system include high processing power, low latency, support for FDD (frequency division duplex) and TDD (time division duplex), an improved end-user environment, and low operating costs with a simple architecture, all on the same platform.

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

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

[0006] Meanwhile, the internet, a human-centered interconnected network where humans generate and consume information, is evolving into the Internet of Things (IoT) network, where distributed components such as objects exchange and process information. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technologies via connections to cloud servers and other systems, is also emerging. To realize IoT, technological 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 objects, machine-to-machine (M2M), and machine-type communication (MTC) are being researched. In an IoT environment, intelligent IT services are provided that collect and analyze data generated from connected objects to create new value in human life. IoT, through the integration and combination of conventional IT technologies and various industries, is being 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.

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

[0008] However, mobile communication systems have gradually expanded their service scope to include not only voice but also data services, and have now developed to the point where they can provide high-speed data services. However, due to resource shortages and users' demand for high-speed services, there is a need for even more advanced mobile communication systems currently in service.

[0009] The 3GPP NR system uses a dynamic Time Division Duplex (TDD) scheme, which allows the orientation of OFDM symbols constituting a slot to be freely changed by the uplink and downlink traffic of small cells. Base stations transmit information about the slot configuration to terminals to support dynamic TDD. However, there is a risk that terminals may not receive the slot configuration information, or that terminal operations may not be performed due to changes in the slot configuration, so there is a need for a way to improve this. [Overview of the project] [Problems that the invention aims to solve]

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

[0011] Another technical problem of the present invention is to provide a terminal for transmitting or receiving control channels and a method for operating the same in a situation where the slot configuration of a TDD substrate, including DL symbols, flexible symbols, and UL symbols, is changed.

[0012] Another technical problem of the present invention is to provide a base station and a method of operating the same for receiving or transmitting control channels in situations where the slot configuration, including DL symbols, flexible symbols, and UL symbols of a TDD base, is changed.

[0013] A further technical problem of the present invention is to provide a terminal and a method of operation thereof that efficiently transmits or receives control channels, taking into account the switching gap in a slot configuration including DL symbols, flexible symbols, and UL symbols on a TDD substrate.

[0014] A further technical problem of the present invention is to provide a base station and a method of operating the same that efficiently receives or transmits a control channel, taking into account the switching gap in a slot configuration including DL symbols, flexible symbols, and UL symbols on a TDD base. [Means for solving the problem]

[0015] According to one aspect of the present invention, a terminal is provided that controls uplink transmission and downlink reception in a wireless communication system. The terminal includes a communication module configured to transmit uplink radio signals to a base station or to receive downlink radio signals from the base station that are assigned to the terminal; a memory configured to store control programs and data used in the terminal; and a processor configured to determine whether transmission of an uplink radio signal or reception of a downlink radio signal assigned to the terminal is available on a slot configured to include at least one of at least one downlink symbol, at least one flexible symbol, and at least one uplink symbol for uplink transmission, and to control the transmission of the uplink radio signal or reception of the downlink radio signal based on the determination.

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

[0017] In other aspects, if the number of symbols required for the transmission of the physical uplink control channel (hereinafter referred to as symbols for PDCCH transmission) is greater than the number of uplink symbols, or the sum of the number of uplink symbols and the number of flexible symbols, the processor will either drop the physical uplink control channel, convert the physical uplink control channel to another type of physical uplink control channel that requires fewer symbols, or control the transmission of the physical uplink control channel across at least one slot after the slot.

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

[0019] In other respects, the downlink wireless signal includes a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and the processor determines that transmission of the physical downlink shared channel or physical downlink control channel is possible if the number of downlink symbols is greater than or equal to a certain number, or if the sum of the number of downlink symbols and the number of flexible symbols is greater than or equal to a certain number.

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

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

[0022] In yet another aspect, if the transmission of the uplink radio signal starts after a predetermined number of gap symbols after 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 yet 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 and a predetermined number of gap symbols among the downlink symbols, the processor drops the transmission of the uplink radio signal.

[0024] In yet another aspect, the slot is configured by information regarding a slot configuration provided by the base station, and the information regarding the slot configuration includes at least one of a cell-specific RRC message generated 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 a terminal to transmit and receive radio signals in a wireless communication system. The method includes determining whether transmission of an uplink radio signal or reception of a downlink radio signal can be performed 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] In one aspect, the uplink wireless signal includes a physical uplink control channel (PUCCH), and the control step includes a transmission step of the physical uplink control channel when the number of uplink symbols is greater than or equal to a certain number, or when the sum of the number of uplink symbols and the number of flexible symbols is greater than or equal to a certain number.

[0027] In other aspects, if the number of symbols required for the transmission of the physical uplink control channel (hereinafter referred to as symbols for PDCCH transmission) is greater than the number of uplink symbols, or the sum of the number of uplink symbols and the number of flexible symbols, the controlling step includes dropping the physical uplink control channel, converting the physical uplink control channel to another type of physical uplink control channel that requires fewer symbols, or transmitting the physical uplink control channel across at least one slot after the slot.

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

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

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

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

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

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

[0034] In another aspect, the slot is comprised of information relating to a slot configuration provided by the base station, the information relating to a 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] Another aspect of the present invention provides a terminal for performing uplink transmission and downlink reception in a wireless communication system. The terminal includes a communication module configured to transmit uplink radio signals to a base station or to receive downlink radio signals from a base station, and a processor configured to determine whether transmission of uplink radio signals or reception of downlink radio signals is enabled in a slot comprising at least one downlink symbol, flexible symbol, or uplink symbol for downlink transmission, and to transmit the uplink radio signals or receive the downlink radio signals based on the determination.

[0036] On one side, if, in the slot, the first symbol to which the uplink radio signal is assigned begins a predetermined number of symbols after the downlink symbol or the last symbol to which the downlink radio signal is assigned, the processor transmits the uplink radio signal.

[0037] In other respects, if the first symbol among the symbols to which the uplink radio signal is assigned in the slot overlaps with at least one of the downlink symbols, the symbols assigned for receiving the downlink radio signal, or a predetermined number of symbols from the last symbol onward, the processor will not transmit the uplink radio signal.

[0038] In other respects, the uplink radio signal includes at least one of the following: a physical uplink control channel, a physical uplink sharing channel, a physical random access channel, and an SRS (souding reference signal).

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

[0040] In other respects, the downlink radio signal includes at least one of the following: 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 other respects, the untransmitted uplink radio signal is a physical uplink control channel, and the processor either converts the physical uplink control channel to another type of physical uplink control channel that is enabled for transmission in the slot and transmits it, or transmits it in the earliest enabled slot after the slot.

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

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

[0044] In other respects, the downlink radio signal includes at least one of the following: a physical downlink shared channel, a physical downlink control channel, or CSI-RS.

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

[0046] Furthermore, in another respect, the uplink radio signal is a physical random access channel.

[0047] In another aspect, the slot is comprised of information relating to a slot configuration provided by the base station, the information relating to a slot configuration includes at least one of a cell-specific RRC message, a terminal-specific RRC message, or dynamic slot format information generated at the RRC layer.

[0048] A further embodiment of the present invention provides a method for performing uplink transmission and downlink reception by a terminal in a wireless communication system. The method includes the steps of: determining whether transmission of an uplink radio signal or reception of the downlink radio signal is valid in a slot configured with at least one downlink symbol for downlink transmission, a flexible symbol, and an 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] On one side, in the slot, if the first symbol among the symbols to which the uplink radio signal is assigned begins a predetermined number of symbols after the downlink symbol or the last symbol among the symbols assigned for receiving the downlink radio signal, the uplink radio signal is transmitted.

[0050] In other respects, if the first symbol among the symbols to which the uplink radio signal is assigned in the slot overlaps with at least one of the downlink symbols, the symbols assigned for receiving the downlink radio signal, or a predetermined number of symbols from the last symbol onward, the transmission of the uplink radio signal will not occur.

[0051] In other respects, the uplink radio signal includes at least one of the following: a physical uplink control channel, a physical uplink sharing channel, a physical random access channel, and an SRS.

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

[0053] In other respects, the downlink radio signal includes at least one of the following: SS / PBCH block, physical downlink shared channel, physical downlink control channel, or CSI-RS.

[0054] In other respects, the untransmitted uplink radio signal is a physical uplink control channel, which is either converted to another type of physical uplink control channel that is enabled for transmission in the slot and transmitted, or transmitted in the earliest enabled slot after the slot.

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

[0056] In another aspect, in the slot, if the last symbol to which the downlink radio signal is assigned overlaps with at least one of the uplink symbols, the symbols assigned for the transmission of the uplink radio signal, or a predetermined number of symbols preceding the first symbol, then the downlink radio signal will not be received.

[0057] In other respects, the downlink radio signal includes at least one of the following: a physical downlink shared channel, a physical downlink control channel, or CSI-RS.

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

[0059] Furthermore, in another respect, the uplink radio signal is a physical random access channel.

[0060] In another aspect, the slot is comprised of information relating to a slot configuration provided by the base station, the information relating to a slot configuration includes at least one of a cell-specific RRC message, a terminal-specific RRC message, or dynamic slot format information generated at the RRC layer. [Effects of the Invention]

[0061] According to the present invention, even if the slot configuration is changed, the terminal can transmit PUCCH, thus preventing PUCCH transmission interruptions or unnecessary retransmission of PUCCH. Furthermore, by defining the effective timing of uplink signals such as PRACH, it is possible to increase the frequency efficiency of the network and reduce terminal energy consumption.

[0062] The effects obtained from this invention are not limited to those mentioned above. Other effects not mentioned should be clearly understood by those with ordinary skill in the art to which this invention belongs from the following description. [Brief explanation of the drawing]

[0063] [Figure 1] This figure shows an example of a wireless frame structure used in wireless communication systems. [Figure 2] This figure shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] This diagram illustrates the physical channels used in 3GPP systems and common signal transmission methods utilizing those physical channels. [Figure 4a] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4b] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5a] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 5b] This diagram shows the CCE integration level and PDCCH multiplexing. [Figure 6] This diagram shows the CORESET (control resource set) through which the PDCCH (physical downlink control channel) is transmitted in a 3GPP NR system. [Figure 7] This diagram shows how to configure the PDCCH search space in a 3GPP NR system. [Figure 8] This is a conceptual diagram explaining career aggregation. [Figure 9] This is a diagram illustrating single-carrier and multiple-carrier communication. [Figure 10]This figure shows an example where the cross-carrier scheduling technique is applied. [Figure 11] This figure shows the slot configuration in a TDD-based mobile communication system. [Figure 12a] This figure shows a PUCCH used in an example wireless communication system. [Figure 12b] This figure shows a PUCCH used in an example wireless communication system. [Figure 12c] This figure shows a PUCCH used in an example wireless communication system. [Figure 13] This diagram shows how to transmit PUCCH via a slot. [Figure 14a] This figure illustrates an example of transmitting PUCCH to other slots when the slot configuration changes. [Figure 14b] This figure illustrates an example of transmitting PUCCH to other slots when the slot configuration changes. [Figure 15a] This diagram shows the slots through which the repetitive PUCCH signal is transmitted, based on the slot configuration. [Figure 15b] This diagram shows the slots through which the repetitive PUCCH signal is transmitted, based on the slot configuration. [Figure 15c] This diagram shows the slots through which the repetitive PUCCH signal is transmitted, based on the slot configuration. [Figure 16a] This diagram shows whether PUCCH transmission is possible depending on the slot configuration. [Figure 16b] This diagram shows whether PUCCH transmission is possible depending on the slot configuration. [Figure 17] This is a block diagram showing the configuration of a terminal and a base station according to one embodiment. [Modes for carrying out the invention]

[0064] The terminology used herein has been selected to be as widely used and general as possible, taking into account the function of the present invention; however, this may vary depending on the intentions, conventions, or emergence of new technologies of the articulate. In some cases, the applicant has arbitrarily selected certain terms, in which case their meaning will be described in the relevant section of the invention description. Therefore, it should be made clear that the terminology used herein should not be merely names of terms, but should be analyzed based on the substantive meaning of the terms and the overall content of this specification.

[0065] Throughout the specification, when one configuration is said to be “connected” to another, this includes not only cases where they are “directly connected,” but also cases where they are “electrically connected” through other intermediate components. Furthermore, when a configuration is said to “include” a particular component, this means, unless otherwise stated, that it includes other components rather than excluding them. In addition, the limitations of “greater than or equal to” or “less than” a particular criticality may be appropriately replaced by “greater than” or “less than” depending on the embodiment.

[0066] The following technologies are used in a variety of wireless connectivity systems, including CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA is implemented using radio technology such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented using radio technology such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM (Registered Trademark) Evolution). OFDMA is implemented using radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and 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) which uses E-UTRA, and LTE-A (Advanced) is an advanced version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A, and is intended to support eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. While this explanation will focus on 3GPP NR for clarity, the technical concept of this invention is not limited to this.

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

[0068] Figure 1 shows an example of a wireless frame structure used in a wireless communication system.

[0069] Referring to Figure 1, a radio frame (or radio frame) used in a 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100) * Tc). A radio frame consists of 10 subframes (SF) of equal size, where Δfmax = 480 * 10³ Hz, Nf = 4096, Tc = 1 / (Δfref * Nf,ref), Δfref = 15 * 10³ Hz, and Nf,ref = 2048. Each of the 10 subframes within a single frame is assigned a number from 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots determined by the subcarrier spacing. More specifically, the subcarrier spacing usable in a 3GPP NR system is 15 * 2 μkHz, where μ is the subcarrier spacing configuration, with values ​​from 0 to 4. In other words, 15kHz, 30kHz, 60kHz, 120kHz, or 240kHz are used as subcarrier intervals. A 1ms subframe consists of 2μm slots, each with a length of 2-μms. The 2μm slots within a subframe are each assigned numbers from 0 to 2μ-1. Similarly, the slots within a radio frame are each assigned numbers from 0 to 10*2μ-1. Time resources are divided by at least one of the following: radio frame number (also called radio frame index), subframe number (also called subframe index), or slot number (or slot index).

[0070] Figure 2 shows 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 contains multiple OFDM symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means a single symbol interval. Unless otherwise specified, OFDM symbols are simply referred to as symbols. Hereafter, in this specification, symbols include OFDM symbols, SC-FDMA symbols, DFTs-OFDM symbols, etc.

[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, x=DL for a downlink resource grid and x=UL for an uplink resource grid. Nsize, μgrid, and x represent the number of resource blocks (RBs) with a subcarrier spacing component μ (x is DL or UL), and Nslotsymb represents the number of OFDM symbols in the slot. NRBSC is the number of subcarriers constituting one RB, where NRBSC=12. OFDM symbols are called CP-OFDM (cyclic prefix OFDM) symbols or DFT-S-OFDM (discrete Fourier transform spread OFDM) symbols depending on the multiplexing scheme.

[0073] The number of OFDM symbols in a single slot can vary depending on the length of the cyclic prefix (CP). For example, a normal CP may contain 14 OFDM symbols in a single slot, while an extended CP may contain 12 OFDM symbols in a single slot. In specific embodiments, extended CPs are used only with a subcarrier interval of 60 kHz. For the sake of explanation, Figure 2 illustrates a case where a single slot consists of 14 OFDM symbols, but the embodiments of the present invention can be applied in the same manner to slots with other numbers of OFDM symbols. Referring to Figure 2, each OFDM symbol contains N size, μgrid, and x*NRBSC subcarriers in the frequency domain. Subcarrier types are divided into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

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

[0075] For a terminal to receive signals from a base station or transmit base station signals, the terminal's time / frequency synchronization must be synchronized with the base station's time / frequency synchronization. This is because, if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters necessary to demodulate DL signals and transmit UL signals at the correct time.

[0076] Each symbol in a radio frame operating in TDD (time division duplex) or unpaired spectrum consists of at least one of the following: a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. In FDD (frequency division duplex) or paired spectrum, a radio frame operating on a downlink carrier consists of either a downlink symbol or a flexible symbol, while a radio frame operating on an uplink carrier consists of either an uplink symbol or a flexible symbol. Downlink symbols can be used for downlink transmission but not uplink transmission, and uplink symbols can be used for uplink transmission but not downlink transmission. The use of a flexible symbol in the downlink or uplink is determined by the signal.

[0077] Information regarding the type of each symbol, i.e., whether it is a downlink symbol, uplink symbol, or flexible symbol, consists of a cell-specific (or common) RRC signal. Additionally, information regarding the type of each symbol consists of a UE-specific (or dedicated) RRC signal. The base station uses the cell-specific RRC signal to indicate: i) the period of the cell-specific slot configuration; ii) the number of slots containing only downlink symbols from the beginning of the cell-specific slot configuration period; iii) the number of downlink symbols from the first symbol of the slot immediately following the downlink-only slot; iv) the number of slots containing only uplink symbols from the end of the cell-specific slot configuration period; and v) the number of uplink symbols from the last symbol of the slot immediately preceding the uplink-only slot. Here, a symbol that is neither an uplink nor a downlink symbol is a flexible symbol.

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

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

[0080]

Table 1

[0081] In Table 1, D represents the downlink symbol, U represents the uplink symbol, and X represents the flexible symbol. As shown in Table 1, a maximum of two DL / UL switching operations are permitted in a single slot.

[0082] Figure 3 illustrates the physical channels used in 3GPP systems (e.g., NR) and a typical signal transmission method utilizing these physical channels.

[0083] When the terminal is powered on or enters a new cell, the terminal performs the initial cell discovery process (S101). Specifically, the terminal synchronizes with the base station during the initial cell discovery. To do this, 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 obtain information such as the cell ID. Next, the terminal receives the physical broadcast channel from the base station and obtains broadcast information within the cell.

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

[0085] If the terminal first accesses the base station or does not have radio resources for signal transmission, the terminal performs an arbitrary access process to the base station S103 to S106. First, the terminal transmits a preamble via a physical random access channel (PRACH) S103, and receives a response message for the preamble from the base station via PDCCH and the corresponding PDSCH S104. If the terminal receives a valid random access response message, the terminal transmits data including its identifier to the base station via a physical uplink shared channel (PUSCH) instructed by the uplink grant transmitted from the base station via PDCCH S105. Next, the terminal waits to receive a PDCCH as instructed by the base station to resolve collisions S106, and the random access process ends.

[0086] After the above procedure, the terminal receives PDCCH / PDSCH S107 and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) S108 as a general uplink / downlink signal transmission procedure. In particular, the terminal receives downlink control information (DCI) via PDCCH. DCI includes control information such as resource allocation information for the terminal. Also, the format of DCI may differ depending on its intended use. 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 the above-mentioned HARQ-ACK and control information such as CSI via PUSCH and / or PUCCH.

[0087] Figure 4 shows the SS / PBCH block for initial cell access in a 3GPP NR system.

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

[0089] Refer to Figure 4(a) for a more detailed explanation of the synchronization signal (SS). The synchronization signal is divided into PSS and SSS. PSS is used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. SSS is used to obtain frame synchronization and cell group ID. Referring to Figure 4(a) and Table 2, an SS / PBCH block consists of 20 RBs (=240 subcarriers) consecutively on the frequency axis and 4 OFDM symbols consecutively on the time axis. In this case, within the SS / PBCH block, the PSS is transmitted via subcarriers 56-182 in the first OFDM symbol, and the SSS is transmitted via subcarriers 56-182 in the third OFDM symbol. Here, the lowest subcarrier index of the SS / PBCH block is assigned starting from 0. In the first OFDM symbol on which the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, i.e., subcarriers 0-55 and 183-239. Furthermore, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals via subcarriers 48-55 and 183-191. In the SS / PBCH block, the base station transmits the PBCH (physical broadcast channel) via the remaining REs excluding the aforementioned signals.

[0090] [Table 2]

[0091] The SS generates a total of 1008 unique physical layer cell IDs through combinations of three PSSs and SSSs. More specifically, each physical layer cell ID is 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. Therefore, the physical layer cell ID NcellID = 3N(1)ID + N(2)ID is uniquely defined by an index N(1)ID ranging from 0 to 335 that represents a physical layer cell identifier group, and an index N(2)ID ranging from 0 to 2 that represents a 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. The terminal also detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical layer identifier. In this process, the sequence d of the PSS PSS (n) is given by the following equation 1.

[0092]

number

[0093]

number

number

[0094]

number

[0095]

number

number

[0096] A 10ms long wireless frame is divided into two 5ms long half-frames. Refer to Figure 4(b) to describe the slot in which the SS / PBCH block is transmitted within each half-frame. The slot in which the SS / PBCH block is transmitted is one of cases A, B, C, D, or E. In case A, the subcarrier spacing is 15kHz, and the start of the SS / PBCH block is at the {2, 8} + 14*n symbol. In this case, n=0, 1 at carrier frequencies below 3GHz. Also, n=0, 1, 2, 3 at carrier frequencies above 3GHz and below 6GHz. In case B, the subcarrier spacing is 30kHz, and the start of the SS / PBCH block is at the {4, 8, 16, 20} + 28*n symbol. In this case, n=0 at carrier frequencies below 3GHz. Also, n=0, 1 at carrier frequencies above 3GHz and below 6GHz. In Case C, the subcarrier spacing is 30 kHz, and the SS / PBCH block starts at the {2nd, 8th} + 14*nth symbol. In this case, 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 SS / PBCH block starts at the {4th, 8th, 16th, 20th} + 28*nth symbol. In this case, 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 SS / PBCH block starts at the {8th, 12th, 16th, 20th, 32nd, 36th, 40th, 44th} + 56*nth symbol. In this case, at carrier frequencies of 6 GHz or higher, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0097] Figure 5 shows the procedure for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5(a), the base station adds a CRC (cyclic redundancy check) masked (e.g., by XOR operation) with an RNTI (radio network temporary identifier) ​​to the control information (e.g., DCI) S202. The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each piece of control information. A common RNTI used by one or more terminals includes at least one of the following: SI-RNTI (system information RNTI), P-RNTI (paging RNTI), RA-RNTI (random access RNTI), and TPC-RNTI (transmit power control RNTI). Furthermore, the terminal-specific RNTI includes at least one of the following: C-RNTI (cell temporary RNTI), CS-RNTI, or MCS-C-RNTI. Next, after the base station performs channel encoding (e.g., polar coding) in S204, it performs rate-matching in S206 to match the amount of resources used for PDCCH transmission. Next, the base station multiplexes the DCIs (etc.) based on the PDCCH structure of the CCE (control channel element) in S208. The base station also applies additional processes S210 to the multiplexed DCIs (etc.), such as scrambling, modulation (e.g., QPSK), and interleaving, before mapping them to the resources to be transmitted. A CCE is the basic resource unit for PDCCH, and one CCE consists of multiple (e.g., 6) REGs (resource element groups). One REG consists of multiple (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as the aggregation level. The 3GPP NR system uses 1, 2, 4, 8, or 16 integrated levels.Figure 5(b) is a diagram relating to the CCE integration level and PDCCH multiplexing, showing the types of CCE integration levels used for a single PDCCH and the CCEs transmitted in the control domain thereunder.

[0098] Figure 6 shows the CORESET through which PDCCH is transmitted in a 3GPP NR system.

[0099] A CORESET is a time-frequency resource on which PDCCH, a control signal for a terminal, is transmitted. Furthermore, the search space, described later, is mapped to a single CORESET. Therefore, instead of monitoring the entire frequency band to receive PDCCH, the terminal monitors the CORESET and the designated time-frequency domain to decode the PDCCH mapped to the CORESET. A base station configures one or more CORESETs for each cell in the terminal. A CORESET consists of up to three consecutive symbols on the time axis. A CORESET also consists of six consecutive PRB units on the frequency axis. In the embodiment shown in Figure 5, CORESET#1 consists of consecutive PRBs, while CORESET#2 and CORESET#3 consist of discontinuous PRBs. A CORESET can be located at any symbol within a slot. For example, in the embodiment shown in Figure 5, CORESET#1 starts at the first symbol in the slot, CORESET#2 starts at the fifth symbol in the slot, and CORESET#9 starts at the ninth symbol in the slot.

[0100] Figure 7 shows how to configure the PDCCH search space in a 3GPP NR system.

[0101] To transmit PDCCH to a terminal, each CORESET has at least one search space. In embodiments of the present invention, the search space is a collection of all time-frequency resources (hereinafter referred to as PDCCH candidates) to which the terminal's PDCCH is transmitted. The search space includes a common search space that all 3GPP NR terminals should search in common, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, PDCCHs that all terminals in a cell belonging to the same base station are set to search in common are monitored. In addition, terminal-specific search spaces are set up individually for each terminal to monitor the PDCCH assigned to each terminal at different locations in the search space depending on the terminal. In the case of terminal-specific search spaces, due to the limited control area to which PDCCHs are assigned, the search spaces between terminals may be partially overlapping. Monitoring PDCCHs includes blind decoding of PDCCH candidates in the search space. If blind decoding is successful, it is expressed as the PDCCH being (successfully) detected / received. If blind decoding fails, it is expressed as the PDCCH not being detected / received, or not being successfully detected / received.

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

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

[0104] The base station transmits the PDCCH containing information about which terminals (one or more terminals) the PDSCH data will be transmitted to and how those terminals should receive and decode the PDSCH data. For example, suppose a DCI transmitted via a specific PDCCH is CRC masked with an RNTI named "A", and that DCI indicates that the PDSCH is assigned to a radio resource (e.g., frequency location) named "B", and indicates transmission format information (e.g., transmission block size, modulation scheme, coding information, etc.) named "C". Terminals monitor the PDCCH using their own RNTI information. In this case, if a terminal blind-decodes the PDCCH using the "A" RNTI, that terminal will receive the PDCCH and, through the information of the received PDCCH, receive the PDSCH indicated by "B" and "C".

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

[0106] [Table 3]

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

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

[0109] -HARQ-ACK: A response to a PDCCH (indicating a DL SPS release) and / or to an uplink transmission block (TB) on a PDSCH. HARQ-ACK indicates whether information transmitted via the PDCCH or PDSCH has been received. 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 and ACK / NACK. Generally, ACK is represented by a bit value of 1 and NACK is represented by a bit value of 0.

[0110] -CSI: This is 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 depending on the information it indicates.

[0111] The 3GPP NR system uses five PUCCH formats to support diverse service scenarios, diverse channel environments, and frame structures.

[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 via two OFDM symbols, the same sequence is transmitted to the two symbols with different RBs. Through this, the terminal obtains a frequency diversity gain. More specifically, the terminal is M bit Bit UCI(M bit The value of the cyclic shift m depends on whether it is =1 or 2. cs Determine the base sequence of length 12 and set the value m cs The cyclically shifted sequence is mapped to 12 REs, consisting of one OFDM symbol and one PRB, and transmitted. The terminal has 12 cyclic shifts available, M bit If = 1, then 1-bit UCI0 and 1 represent a sequence of two cyclic shifts with a difference of 6 in cyclic shift values. Also, M bit If = 2, then the 2-bit UCI00, 01, 11, and 10 represent a sequence of four cyclic shifts where the difference in cyclic shift values ​​is 3.

[0113] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via a continuous sequence of OFDM symbols on the time axis and a single PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one between 4 and 14. More specifically, a UCI with Mbit=1 is modulated with BPSK. The terminal modulates a UCI with Mbit=2 with 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 transmits the obtained signal by spreading it with a time-axis OCC (orthogonal cover code) to the even-numbered OFDM symbols assigned to PUCCH format 1. The maximum number of different terminals that can be multiplexed on the same RB in PUCCH format 1 is determined by the length of the OCC used. For odd-numbered OFDM symbols in PUCCH format 1, the DMRS (demodulation reference signal) is spread across the OCC and mapped to them.

[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 via two OFDM symbols, the same sequence is transmitted via the two OFDM symbols with different RBs. Through this, the terminal obtains frequency diversity gain. More specifically, an Mbit bit UCI (Mbit > 2) is bit-level scrambled and QPSK modulated and mapped to the RBs of one or two OFDM symbols, where the number of RBs is one between 1 and 16.

[0115] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via continuous OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. Specifically, the terminal modulates an Mbit bit UCI (Mbit > 2) with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex number symbols d(0) to d(Msymb-1). Here, with π / 2-BPSK, Msymb = Mbit, and with 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 PreDFT-OCC of length -12 so that the PUCCH format 4 has two or four multiplexing capacities. The terminal transmits the spread signal by transmitting precoding (or DFT-precoding) and mapping it to each RE.

[0116] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of the UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, it 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 will not transmit some of the UCI information according to the priority of the UCI information, and will transmit only the remaining UCI information.

[0117] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via an RRC signal to instruct frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency-hopped is determined by the RRC signal. If PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols in the time axis, the first hop will have floor(N / 2) OFDM symbols, the second hop will have ceil(N / 2) OFDM symbols.

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

[0119] On the other hand, in the 3GPP NR system, terminals transmit and receive using a bandwidth smaller than or equal to the carrier (or cell) bandwidth. For this purpose, terminals are configured with a bandwidth part (BWP) consisting of a continuous portion of the carrier bandwidth. Terminals operating according to TDD or in the ampered spectrum have up to four DL / UL BWP pairs per carrier (or cell). The terminal also activates one DL / UL BWP pair. Terminals operating according to FDD or in the paired spectrum have up to four DL BWPs configured on the downlink carrier (or cell) and up to four UL BWPs configured on the uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal does not have to receive or transmit from time-frequency resources other than the activated BWPs. The activated BWPs are called active BWPs.

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

[0121] Figure 8 is a conceptual diagram illustrating carrier aggregation. Carrier aggregation refers to a method by which a wireless communication system uses multiple frequency blocks, or (logical) cells, consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers), to utilize a wider frequency band within a single larger logical frequency band. For convenience of explanation, the term "component carrier" will be used consistently below.

[0122] Referring to Figure 8, as an example of a 3GPP NR system, the overall system bandwidth includes up to 16 component carriers, each component carrier having a bandwidth of up to 400 MHz. Each component carrier includes one or more physically consecutive subcarriers. Although Figure 8 shows each component carrier having the same bandwidth, this is merely illustrative, and each component carrier may have different bandwidths. Also, although each component carrier is shown as being adjacent to each other on the frequency axis, the diagram is a logical representation, and each component carrier may be physically adjacent to or far from each other.

[0123] Each component carrier uses a different center frequency. Furthermore, physically adjacent component carriers share a single common center frequency. In the embodiment shown in Figure 8, assuming all component carriers are physically adjacent, center frequency A is used for all component carriers. If we assume that the component carriers are not physically adjacent, then center frequencies A and B are used for each component carrier.

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

[0125] Figure 9 is a diagram illustrating terminal carrier communication and multiple carrier communication. Specifically, Figure 9(a) shows the subframe structure of a single carrier, and Figure 9(b) shows the subframe structure of a multiple carrier.

[0126] Referring to Figure 9(a), a typical wireless communication system, in FDD mode, transmits or receives data via one DL band and its corresponding UL band. In other specific embodiments, in TDD mode, the wireless communication system divides the wireless frame into uplink time units and downlink time units in the time domain, and transmits or receives data via the uplink / downlink time units. Referring to Figure 9(b), three 20MHz component carriers (CCs) are aggregated in both the UL and DL bands, supporting a 60MHz bandwidth. Each CC is either adjacent or non-adjacent to the others in the frequency domain. For convenience, Figure 9(b) shows a symmetrical case where the bandwidths of the UL CCs and DL CCs are the same, but the bandwidths of each CC may be determined independently. Asymmetric carrier aggregations with different numbers of UL CCs and DL CCs are also possible. A DL / UL CC assigned / configured to a specific terminal via RRC is referred to as the serving DL / UL CC of that terminal.

[0127] A base station communicates with a terminal by activating some or all of the terminal's serving CCs, or by deactivating some of the CCs. The base station may change which CCs are activated / deactivated, or change the number of CCs that are activated / deactivated. Once a base station assigns available CCs to a terminal on a cell-specific or terminal-specific basis, at least one of the initially assigned CCs does not need to be deactivated unless the CC assignments for the terminal are completely reconfigured or the terminal is handed over. The CC that is not deactivated by the terminal is called the primary CC (PCC) or PCell (primary cell), and the CC that the base station can freely activate / deactivate is called the secondary CC (SCC) or SCell (secondary cell).

[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 and uplink resources, i.e., a combination of DL CC and UL CC. A cell consists of DL resources alone, or a combination of DL and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or DL ​​CC) and the carrier frequency of the UL resource (or UL CC) is indicated by system information. Carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called a SCell. In the downlink, the carrier corresponding to a PCell is a DL PCC, and in the uplink, the carrier corresponding to a PCell is a UL PCC. Similarly, in the downlink, the carrier corresponding to a SCell is a DL SCC, and in the uplink, the carrier corresponding to a SCell is a UL SCC. Depending on the terminal capacity, a serving cell consists of one PCell and zero or more SCells. If the RRC_CONNECTED state exists but carrier aggregation is not configured, or if the UE does not support carrier aggregation, there will be only one serving cell consisting solely of PCells.

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

[0130] Figure 10 shows an example where the cross-carrier scheduling technique is applied. Once cross-carrier scheduling is set up, the control channel transmitted via the first CC uses the carrier indicator field (CIF) to schedule the data channel transmitted via the first or second CC. The CIF is contained within the DCI. In other words, a scheduling cell is set up, and DL grants / UL grants transmitted from the PDCCH region of the scheduling cell schedule the PDSCH / PUSCH of the scheduled cell. That is, the PDCCH region of the scheduling cell is a search area for multiple component carriers. A PCell is essentially a scheduling cell, and a specific SCell is designated as a scheduling cell by a higher hierarchy.

[0131] In the embodiment shown in Figure 10, we assume that three DL CCs are merged. Here, DL component carrier #0 is assumed to be a DL PCC (or PCell), and DL component carriers #1 and #2 are assumed to be DL SCCs (or SCells). We also assume that the DL PCC is configured as a PDCCH monitoring CC. If cross-carrier scheduling is not configured by terminal-specific (or terminal-group-specific, or cell-specific) higher-level signaling, the CIF will be disabled, and each DL CC will transmit only PDCCHs that schedule their own PDSCH without a CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). In contrast, if cross-carrier scheduling is configured through terminal-specific (or terminal-group-specific, or cell-specific) higher-level signaling, CIF becomes enabled, and a specific CC (e.g., DL PCC) uses CIF to transmit not only PDCCHs that schedule PDSCHs of DL CC A, but also PDCCHs that schedule PDSCHs of other CCs (cross-carrier scheduling). In contrast, other DL CCs do not transmit PDCCHs. Therefore, depending on whether cross-carrier scheduling is configured for the terminal, the terminal either monitors PDCCHs without CIFs and receives self-carrier scheduled PDSCHs, or monitors PDCCHs with CIFs and receives cross-carrier scheduled PDSCHs.

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

[0133] In this invention, the number of symbols contained in one slot is 14 if the cell consists of normal CPs (cyclic prefixes), and 12 if the cell consists of extended CPs. However, for the sake of explanation, we will assume that there are 7 symbols.

[0134] Figure 11 shows the slot configuration in a TDD-based mobile communication system.

[0135] Referring to Figure 11, four slot configurations are defined: a slot containing only DL symbols (DL-only), a slot primarily containing DL symbols (DL-centric), a slot primarily containing UL symbols (UL-centric), and a slot containing only UL symbols (UL-only).

[0136] Each slot contains seven symbols. A gap (GP) exists when switching from a downlink to an uplink, or from an uplink to a downlink. In other words, 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. Hereafter, the symbols that constitute the gap will be referred to as gap symbols.

[0137] A slot containing only DL symbols (DL-only) literally contains only DL symbols. For example, a slot containing only DL symbols contains seven DL symbols, as shown in the DL-only section of Figure 11.

[0138] A DL-centric slot contains multiple DL symbols, at least one gap symbol, and at least one UL symbol. For example, a DL-centric slot, as shown in Figure 11, contains five DL symbols, one gap symbol, and one UL symbol in sequence.

[0139] A slot primarily composed of UL symbols (UL-centric) contains at least one DL symbol, at least one gap symbol, and multiple UL symbols. For example, a slot primarily composed of UL symbols, as shown in Figure 11's UL-centric, sequentially contains one DL symbol, one gap symbol, and five UL symbols.

[0140] A slot containing only UL symbols (UL-only) literally contains only UL symbols. For example, a slot containing only UL symbols contains seven UL symbols, as shown in the UL-only section of Figure 11.

[0141] The network informs terminals of the default slot configuration, and RRC signaling is used for this purpose. Information regarding the RRC signaling and the configured default slot configuration is referred to as semi-static DL / UL allocation information. The default slot configuration is the slot configuration that a terminal can assume the network will use unless the base station transmits a separate signaling to the terminal regarding a change in the slot configuration. The 3GPP NR system supports dynamic TDD, which changes the slot configuration to suit the diverse traffic conditions of the terminal. To this end, the base station informs terminals of the current or future slot configuration for each slot, or every few slots, or whenever the base station changes the slot configuration. The NR system uses two methods to inform terminals of the aforementioned slot configuration.

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

[0143] The second method involves transmitting information about the slot configuration using a UE-specific PDCCH that schedules a PDSCH or PUSCH. The UE-specific PDCCH is transmitted unicast only to specific users who require scheduling. The UE-specific PDCCH transmits the same slot format information indicator as transmitted by the group-shared PDCCH as the slot configuration information for the scheduled slot. Alternatively, the UE-specific PDCCH contains information that allows the configuration of the scheduled slot to be inferred. For example, by receiving the UE-specific PDCCH assigned to it, a terminal learns the slot to which the PDSCH or PUSCH is assigned and the location of the OFDM symbol within that slot, and then infers the configuration of that slot. Furthermore, the UE-specific PDCCH that schedules the PDSCH indicates the slot to which a PUCCH containing HARQ-ACK feedback information is transmitted, and the location of the OFDM symbol within that slot, and then infers the configuration of the slot to 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, sequence, and reference signals (DM-RS, CSI-RS, TRS, PT-RS, etc.) generated and processed at the physical layer, as well as MAC messages and RRC messages (or RRC signaling) generated and processed at the MAC layer and RRC layer, respectively. MAC messages and RRC messages may be referred to as upper-level signaling to distinguish them from the physical layer signals that constitute the lower layers of the OSI. Here, the downlink physical channel further includes a downlink physical shared channel (PDSCH), a downlink physical control channel (PDCCH), and a physical broadcast channel (PBCH).

[0145] Furthermore, the uplink signal used in this invention is a radio signal transmitted by a terminal to a base station, and includes a physical uplink channel, sequence, and reference signal (such as SRS) generated and processed at the physical layer, and MAC messages and RRC messages (or RRC signaling) generated and processed at the MAC layer and RRC layer, respectively. Here, the uplink physical channel further includes an uplink physical shared channel (PUSCH), an uplink physical control channel (PUCCH), and a physical random access channel (PRACH).

[0146] Figure 12 shows a PUCCH used in an example wireless communication system.

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

[0148] The first type PUCCH is called a Long PUCCH and is transmitted by mapping it to four or more consecutive symbols in a slot. The first type PUCCH is mainly used to transmit a large amount of UCI (uplink control information) or is assigned to users with low signal strength to increase PUCCH coverage. The first type PUCCH is also repeatedly transmitted to multiple slots to increase PUCCH coverage. The first type PUCCH includes PUCCH format 1, which transmits 1 or 2 bits of UCI; PUCCH format 3, which transmits UCI exceeding 2 bits but does not support multiplexing between users; and PUCCH format 4, which transmits UCI exceeding 2 bits but supports multiplexing between users.

[0149] The second type of PUCCH, also known as Short PUCCH, is mapped to one or two symbols in a slot and is used to transmit small amounts of UCI, or to assign users with high signal strength, and to support services requiring low latency. The second type of PUCCH includes PUCCH format 0, which transmits 1 or 2 bits of UCI, and PUCCH format 2, which transmits more than 2 bits of UCI.

[0150] A single slot contains time-frequency resources usable as Type 1 PUCCH and time-frequency resources usable as Type 2 PUCCH, which can be assigned to different terminals or to a single terminal. When assigned to a single terminal, Type 1 PUCCH and Type 2 PUCCH are transmitted using different time resources (i.e., different OFDM symbols). In other words, when assigned to a single terminal, Type 1 PUCCH and Type 2 PUCCH are transmitted using TDM (Time Division Multiplexing).

[0151] UCI mapped to PUCCH includes SR (Scheduling Grant), HARQ-ACK, RI, CSI, and BI (Beam-related Information). SR is information that the terminal informs the base station that there is an uplink transmission. HARQ-ACK is information that indicates whether the PDSCH transmitted by the base station was successfully received. RI is information that indicates the rank that can be transmitted on the radio channel when using multiple antennas. CSI is information that indicates the value of the channel status measured by the terminal between the base station and the terminal. BI is information that indicates beamforming information at the transmitting and receiving ends.

[0152] Referring to Figure 12(a), the DL-centric slot shown consists of and indicates five DL symbols, one flexible symbol, and one UL symbol. A second-type PUCCH of one symbol length is assigned to the DL-centric slot. The second-type PUCCH is located at the end of the slot.

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

[0154] Referring to Figure 12(c), slots containing only UL symbols (UL only) are assigned either a Type 1 PUCCH or / or a Type 2 PUCCH. For example, a Type 1 PUCCH maps to six symbols, while a Type 2 PUCCH maps to the last symbol in the slot.

[0155] Referring to Figures 11 and 12, the slot configurations capable of transmitting Type 2 PUCCH are slots primarily using DL symbols, slots primarily using UL symbols, and slots containing only UL symbols. The slot configurations capable of transmitting Type 1 PUCCH are slots primarily using UL symbols and slots containing only UL symbols. Furthermore, for both Type 1 and Type 2 PUCCH, the slots capable of transmission via TDM are slots primarily using UL symbols and slots containing only UL symbols. Incidentally, since a slot primarily using DL symbols has only one symbol assigned on the uplink, Type 2 PUCCH can be transmitted, but Type 1 PUCCH cannot. Therefore, the PDCCH scheduling PUCCH assigns Type 1 PUCCH to slots primarily using UL symbols or slots containing only UL symbols. Also, the PDCCH scheduling PUCCH assigns Type 2 PUCCH to slots primarily using DL symbols, slots primarily using UL symbols, or slots containing only UL symbols.

[0156] As described above, the base station (or network) changes the slot configuration in response to terminal traffic and various circumstances, and notifies the terminal of the change in the slot configuration. Because the slot configuration is changed in this way, the terminal should receive information about the slot configuration by monitoring the group-shared PDCCH and terminal-specific PDCCH. However, due to issues such as radio channel conditions and interference between the base station and the terminal, the terminal may fail to receive the group-shared PDCCH and terminal-specific PDCCH.

[0157] If a terminal fails to receive a group-shared PDCCH and / or a terminal-specific PDCCH, the terminal cannot determine whether the base station has changed the slot configuration. However, if the base station has changed the slot configuration and the scheduled PUCCH transmission by the terminal does not fit the changed slot configuration, the terminal may attempt to transmit the PUCCH as planned, resulting in a transmission failure and potentially causing problems such as temporary communication interruptions or delays. Therefore, in such cases, a clear procedure or pre-established agreement between the terminal and the base station is necessary regarding whether the terminal should transmit the instructed PUCCH or abandon it, and if so, how to transmit it.

[0158] An embodiment for this purpose defines a method of operation for a terminal and a base station to resolve the case when a terminal fails to receive a group-shared PDCCH and / or terminal-specific PDCCH containing a slot configuration information indicator and slot configuration-related information.

[0159] Furthermore, other embodiments define a terminal and its operation method for handling the transmission of a PUCCH if, despite the terminal having successfully received a group-shared PDCCH and / or terminal-specific PDCCH containing a slot configuration information indicator and slot configuration-related information, the configuration of the slot to which a PUCCH is assigned (or to which transmission of a PUCCH is scheduled) is changed and the assigned PUCCH cannot be transmitted, and a base station and its operation method for handling the reception of the assigned PUCCH.

[0160] [Examples] First, the operation method of the terminal and 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 changes in the base station's slot configuration. In this case, terminal PUCCH transmission is performed regardless of the success or failure of receiving the terminal's group-shared PDCCH and terminal-specific PDCCH.

[0161] Example: Maintain the same slot configuration without changing the slot containing the symbol to which PUCCH is assigned (or transmitted).

[0162] This embodiment can be further divided into detailed examples depending on whether the assigned (or transmitted) PUCCH is a first-type PUCCH or a second-type PUCCH. As an example, the slot configuration of a symbol to which a Type 1 PUCCH is assigned (or transmitted) remains unchanged and is maintained. In other words, the base station does not change the slot configuration of an OFDM symbol to which a Type 1 PUCCH is assigned, and the terminal also assumes (or promises, expects) that the slot configuration of an OFDM symbol to which a Type 1 PUCCH is assigned will not change. Therefore, the terminal transmits a Type 1 PUCCH regardless of the reception of slot configuration information indicators and slot configuration-related information transmitted in group-shared PDCCHs and terminal-specific PDCCHs.

[0163] As another example, the slot configuration of a symbol to which a Type 2 PUCCH is assigned (or transmitted) remains unchanged and is maintained. That is, the base station does not change the slot configuration of a symbol to which a Type 2 PUCCH is assigned (or transmitted), and the terminal also assumes (or promises, expects) that the slot configuration of a symbol to which a Type 2 PUCCH is assigned (or transmitted) remains unchanged. Therefore, the terminal transmits a Type 2 PUCCH regardless of the reception of slot configuration information indicators and slot configuration-related information transmitted in group-shared PDCCHs and terminal-specific PDCCHs.

[0164] As described above, embodiments that prohibit changes to the base station slot configuration can restrict flexible scheduling. To complement this aspect, embodiments of other aspects that allow changes to the base station slot configuration within a certain range are disclosed below.

[0165] PUCCH can only change the slot configuration of the symbols to which it is assigned (or transmitted) within a certain range.

[0166] Even if the slot configuration of the symbol to which a PUCCH is assigned (or transmitted) is changed, it will only be changed to a slot configuration that allows the transmission of the PUCCH, and will not be changed to a slot configuration that makes the transmission of the PUCCH impossible. Therefore, the terminal does not expect the slot to be instructed by the base station to transmit the PUCCH to be changed to a slot that makes the transmission of the PUCCH impossible. Embodiments of this aspect can be further divided into detailed embodiments depending on whether the assigned (or transmitted) PUCCH is a first-type PUCCH or a second-type PUCCH.

[0167] For example, even if a base station changes the slot configuration of a symbol to which a Type 1 PUCCH is assigned, it can change the slot configuration to one that enables the transmission of a Type 1 PUCCH, but it cannot change it to one that does not enable the transmission of a Type 1 PUCCH. Therefore, a terminal does not expect the base station to change a slot to one that does not enable the transmission of a Type 1 PUCCH for a slot that it has been instructed to transmit a Type 1 PUCCH for. Even if a terminal fails to receive a group-shared PDCCH containing a slot configuration information indicator for a slot that transmits a Type 1 PUCCH, the terminal will always transmit the Type 1 PUCCH using the resources to which it is assigned.

[0168] For example, referring to Figure 12, a base station can change a slot primarily containing UL symbols to which a first-type PUCCH of 4OFDM symbol length is assigned to a slot containing only UL symbols, but it cannot change it to a slot containing only DL symbols with one UL symbol, or a slot primarily containing DL symbols. On the other hand, a terminal expects a slot primarily containing UL symbols to which a first-type PUCCH of 4OFDM symbol length is assigned, as instructed by the base station to transmit, to be changed to a slot containing only UL symbols, but does not expect it to be changed to a slot containing only DL symbols or a slot primarily containing DL symbols. Furthermore, the terminal does not expect a change in the slot configuration in which UL symbols (etc.) instructed by the base station to transmit a first-type PUCCH are changed to DL symbols (etc.).

[0169] As another example, a base station can change the slot configuration of a symbol to which a Type 2 PUCCH has been assigned to enable the transmission of a Type 2 PUCCH, but it cannot change it to a slot configuration that makes it impossible. Therefore, a terminal does not expect the base station to change a slot to which it has been instructed to transmit a Type 2 PUCCH to make it impossible. Even if a terminal fails to receive a group-shared PDCCH containing the slot configuration information indicator for the slot transmitting the Type 2 PUCCH, the terminal will always transmit the Type 2 PUCCH using the allocated resources. More specifically, a base station can change a slot primarily composed of UL symbols to which a Type 2 PUCCH has been assigned to enable the transmission of a Type 2 PUCCH to a slot primarily composed of DL symbols or a slot containing only UL symbols, but it cannot change it to a slot containing only DL symbols that makes it impossible to transmit a Type 2 PUCCH. And, as a terminal, you do not expect the base station to change a slot to which it has been instructed to transmit a Type 2 PUCCH to make it impossible.

[0170] For example, a terminal expects (or anticipates) that a slot primarily containing UL symbols to which a 1 or 2-symbol-length second-type PUCCH has been assigned for transmission by the base station can be changed to a slot primarily containing DL symbols that include the second-type PUCCH, or a slot containing only UL symbols, but does not expect (or anticipate) that it will be changed to a slot containing only DL symbols that cannot contain the second-type PUCCH. Furthermore, the terminal does not expect a change in the slot configuration that would change UL symbols (etc.) instructed by the base station to transmit the second-type PUCCH to DL symbols (etc.).

[0171] As described above, compared to embodiments that allow changes to the base station slot configuration within a certain range, we disclose embodiments of other aspects that further increase scheduling flexibility.

[0172] PUCCH allows you to freely change the slot configuration of the symbols to which it is assigned (or transmitted).

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

[0174] In one example where the PUCCH is a first-type PUCCH, if the terminal fails to receive a group-shared PDCCH that includes a slot configuration information indicator for the slot on which the first-type PUCCH is transmitted, the terminal will not transmit the first-type PUCCH using the allocated resources.

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

[0176] According to the embodiment described above, even if a terminal fails to receive the group-shared PDCCH and / or terminal-specific PDCCH from the base station, the feasibility and transmission procedure of the scheduled PUCCH are clearly defined, thus resolving communication errors and delay problems.

[0177] [Other examples] Other embodiments of this specification relate to a procedure for the operation of a terminal and a base station when the base station's slot configuration can be freely changed and the terminal successfully receives at least one of the following: a slot configuration information indicator, a group shared PDCCH containing slot configuration-related information, and a terminal-specific PDCCH.

[0178] More specifically, if the configuration of a slot to which a PUCCH is assigned (or to which a PUCCH is scheduled to be transmitted) is changed, and the changed slot configuration contradicts the PUCCH (i.e., if the symbol to which the PUCCH is assigned in the slot to which the PUCCH is assigned overlaps with a DL symbol due to the changed slot configuration), a terminal that handles the transmission of the PUCCH and a base station that handles the reception of the PUCCH and a base station that handles the reception of the PUCCH are disclosed.

[0179] In the modified slot configuration, transmission of the assigned PUCCH may or may not be possible (or effective, compatible) (so-called contradictory slot configuration). Here, slots on which PUCCH transmission is possible include, for example, a slot primarily composed of UL symbols or containing only UL symbols to which a first type PUCCH is assigned, as shown in Figure 12, a slot primarily composed of DL symbols or containing only UL symbols to which a second type PUCCH is assigned, and a slot primarily composed of UL symbols or containing only UL symbols. Slots on which PUCCH transmission is not possible include, for example, a case where a slot to which a first type PUCCH is assigned is changed to a slot configuration primarily composed of DL symbols or containing only DL symbols, or a case where a slot to which a second type PUCCH is assigned is changed to a slot configuration containing only DL symbols.

[0180] If the configuration of a slot instructed to transmit a PUCCH is changed, the terminal may transmit the PUCCH as scheduled in the instructed slot, provided that the transmission of the assigned PUCCH is possible (or valid and suitable) in the changed slot configuration. However, in order to transmit the PUCCH as scheduled even when the instructed slot is incompatible with PUCCH transmission due to the configuration change, a special agreement is required between the terminal and the base station. The following describes how to process PUCCH under incompatible slot configurations. Since the information transmitted to the base station via PUCCH is UCI, the present invention includes embodiments in which the term PUCCH is replaced with UCI in all embodiments of this specification. For example, the method for processing PUCCH under incompatible slot configurations corresponds to the method for processing UCI (HARQ-ACK, RI, etc.) under incompatible slot configurations from the perspective of UCI.

[0181] How to process PUCCH in the designated slot

[0182] First, we will explain how to handle PUCCH under conflicting slot configurations when the assigned PUCCH is a Type 1 PUCCH. Type 1 PUCCHs are mapped to UCIs (HARQ-ACK, RI, CSI, etc.) as explained with reference to Figure 3.

[0183] In one aspect, the PUCCH processing method includes the steps of: a terminal receiving a group-shared PDCCH that includes a slot configuration information indicator for a slot instructed to transmit a first-type PUCCH; and transmitting a first-type PUCCH or a second-type PUCCH in the instructed slot under the conditions exemplified below.

[0184] For example, the terminal transmits the first type PUCCH in the designated slot based on the result of comparing the UL symbols resulting from the slot configuration in the slot where the transmission of the first type PUCCH is instructed with the UL symbols allocated for the transmission of the first type PUCCH. For instance, if the UL symbols resulting from the slot configuration in the slot where the transmission of the first type PUCCH is instructed are greater than (or greater than or equal to) the UL symbols required for the transmission of the first type PUCCH, the terminal transmits the first type PUCCH using the allocated resources in the slot.

[0185] As another example, a terminal transmits a Type 1 PUCCH, or drops or suspends the transmission, based on a comparison between the UL symbols in the slot configuration of the slot where the transmission of the Type 1 PUCCH is instructed and the UL symbols required for the transmission of the Type 1 PUCCH. For example, if the UL symbols in the slot configuration of the slot where the transmission of the Type 1 PUCCH is instructed are smaller than the UL symbols required for the transmission of the Type 1 PUCCH, the terminal drops the transmission of the Type 1 PUCCH in the instructed slot. For example, if the slot where the PUCCH transmission is instructed is a multiple slot, the terminal defers the transmission of the Type 1 PUCCH to a second slot that provides the UL symbols required for the transmission of the Type 1 PUCCH, rather than the first slot where the transmission of the Type 1 PUCCH was scheduled. Conversely, if the slot where the PUCCH transmission is instructed is a single slot, the terminal drops or suspends the scheduled transmission of the Type 1 PUCCH.

[0186] As another example, the terminal transmits the first type PUCCH based on a comparison of the UL symbols, flexible symbols, and UL symbols allocated for the transmission of the first type PUCCH in the slot where the transmission of the first type PUCCH is instructed. 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 PUCCH is instructed are greater than (or greater than or equal to) the UL symbols required for the transmission of the first type PUCCH, the terminal transmits the first type PUCCH using the allocated resources in the slot.

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

[0188] In other aspects, the PUCCH processing method includes the steps of: the terminal receiving a group-shared PDCCH and a terminal-specific PDCCH that inform the terminal of the slot configuration of the slot instructed to transmit a first-type PUCCH; and transmitting a first-type PUCCH or a second-type PUCCH depending on the conditions. In this case, the terminal decides whether or not to transmit a first-type PUCCH in the instructed slot based on the conditions illustrated below.

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

[0190] As another example, i) a base station can change the configuration of a slot to which a Type 1 PUCCH has been assigned, ii) a terminal successfully receives a group-shared PDCCH and a terminal-specific PDCCH informing it of the configuration of the slot to which a Type 1 PUCCH has been assigned, but iii) if the slot configuration is such that a Type 1 PUCCH cannot be transmitted, the terminal will either not transmit a Type 1 PUCCH in the slot, transmit a Type 1 PUCCH adapted to the changed slot configuration, or transmit a Type 2 PUCCH in the slot instead of a Type 1 PUCCH, as shown in Figure 13. The specific actions of the terminal are shown in Table 4 below.

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

[0192] As another example, if i) a base station can change the configuration of a slot to which a first-type PUCCH is assigned, ii) a terminal successfully receives a group-shared PDCCH and a terminal-specific PDCCH informing it of the configuration of a slot to which a first-type PUCCH is assigned, iii) the slot configuration is a slot capable of transmitting a first-type PUCCH, iv) a PUSCH is assigned to the slot (or transmission of a PUSCH is scheduled) and the slot is set to transmit PUCCH and PUSCH simultaneously, and v) the transmission of a first-type PUCCH is prevented due to the possibility of inter-modulation distortion (IMD) occurring due to frequency separation between PUCCH and PUSCH, then the terminal will perform at least one of the operations shown in Table 4 above.

[0193] Next, we will describe the case where the assigned PUCCH is a Type 2 PUCCH. Type 2 PUCCHs are mapped to UCIs (HARQ-ACK, RI, CSI, etc.) as described with reference to Figure 3.

[0194] In one aspect, the PUCCH processing method includes the steps of: the terminal receiving a group-shared PDCCH containing a slot configuration information indicator for a slot instructed to transmit a second-type PUCCH; and transmitting a second-type PUCCH based on conditions. In this case, the terminal decides whether or not to transmit a second-type PUCCH based on the conditions exemplified below.

[0195] For example, the terminal transmits a Type 2 PUCCH based on a comparison between the UL symbols resulting from the slot configuration in the slot where the transmission of the Type 2 PUCCH is instructed and the UL symbols allocated for the transmission of the Type 2 PUCCH. For instance, if the UL symbols resulting from the slot configuration in the slot where the transmission of the Type 2 PUCCH is instructed are greater than (or greater than or equal to) the UL symbols required for the transmission of the Type 2 PUCCH, the terminal transmits the Type 2 PUCCH using the allocated resources in the slot.

[0196] As another example, the terminal transmits the Type 2 PUCCH, drops the transmission, or postpones it based on a comparison between the UL symbols in the slot configuration of the slot instructed to transmit the Type 2 PUCCH and the UL symbols required for the transmission of the Type 2 PUCCH. For example, if the UL symbols in the slot configuration of the slot instructed to transmit the Type 2 PUCCH are smaller than the UL symbols allocated for the transmission of the Type 2 PUCCH, the terminal abandons the transmission of the Type 2 PUCCH in the instructed slot. For example, if the slot instructed to transmit the PUCCH is a multiplexed slot, the terminal transmits the Type 2 PUCCH in the second slot from among the multiplexed slots that satisfies the number of UL symbols required for the transmission of the Type 2 PUCCH. On the other hand, if the slot instructed to transmit the PUCCH is a single slot, the terminal abandons or postpones the scheduled transmission of the Type 2 PUCCH.

[0197] As another example, the terminal transmits the second type PUCCH based on a comparison of the UL symbols, flexible symbols, and UL symbols allocated for the transmission of the second type PUCCH in the slot where the transmission of the second type PUCCH is instructed. For example, if the symbols including the UL symbols and flexible symbols in the slot configuration in the slot where the transmission of the second type PUCCH is instructed are greater than (or greater than or equal to) the UL symbols required for the transmission of the second type PUCCH, the terminal transmits the second type PUCCH using the allocated resources in the slot.

[0198] As another example, the terminal transmits the Type 2 PUCCH, drops the transmission, or postpones the transmission based on a comparison of the UL symbols, flexible symbols, and UL symbols required for the transmission of the Type 2 PUCCH in the slot where the transmission of the Type 2 PUCCH is instructed. For example, if the symbols including the UL symbols and flexible symbols in the slot configuration of the slot where the transmission of the Type 2 PUCCH is instructed are smaller than the UL symbols required for the transmission of the Type 2 PUCCH, the terminal abandons the transmission of the Type 2 PUCCH in the instructed slot. For example, if the slot where the PUCCH transmission is instructed is a multiplexed slot, the terminal transmits the Type 2 PUCCH in the second slot from among the multiplexed slots that satisfies the number of UL symbols required for the transmission of the Type 2 PUCCH. On the other hand, if the slot where the PUCCH transmission is instructed is a single slot, the terminal abandons or postpones the scheduled transmission of the Type 2 PUCCH.

[0199] How to process PUCCH in a slot different from the one specified

[0200] The PUCCH processing method according to this embodiment includes the step of the terminal transmitting the PUCCH in a different slot after the one instructed to transmit the PUCCH if the configuration of the slot to which the PUCCH transmission is instructed is changed. In other words, if the UL symbol carrying the PUCCH in the slot to which the PUCCH is assigned overlaps with the DL symbol in the same slot due to the changed slot configuration, the terminal postpones (postpone or defers) the transmission of the PUCCH to a different slot that is capable of transmitting the PUCCH but is not the one instructed to transmit it.

[0201] In the deferred slots, the same type of PUCCH as the assigned specific type of PUCCH may be transmitted, or a different type of PUCCH than the assigned specific type of PUCCH may be transmitted. In the deferred slots, the allocation of the time domain for PUCCH transmission, in which the same type of PUCCH as the assigned specific type of PUCCH is transmitted, may differ from the assigned specific type of PUCCH.

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

[0203] Figure 14 shows an example of transmitting PUCCH to other slots when the slot configuration changes.

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

[0205] In other words, if the base station changes the configuration of a slot to which a first-type PUCCH has been assigned, and the terminal successfully receives a group-shared PDCCH and a terminal-specific PDCCH containing information about the slot configuration, but the slot configuration is such that the first-type PUCCH cannot be transmitted, the terminal will not transmit the first-type PUCCH in that slot, but will instead transmit the first-type PUCCH in the nearest subsequent slot that is capable of transmitting it.

[0206] On the other hand, referring to Figure 14(b), the terminal recognizes, via receiving a group-shared PDCCH and / or terminal-specific PDCCH that notify it of the change in slot configuration, that slot N, which mainly consists of UL symbols and to which a first type PUCCH (Long PUCCH) has been assigned, has been changed by the base station to a slot configuration that prevents the transmission of the first type PUCCH. In this case, the terminal does not transmit the first type PUCCH in slot N, but transmits a second type PUCCH (Short PUCCH) in slot N+K. In the deferred slot N+K, a second type PUCCH, which is of a different type from the assigned first type PUCCH, is transmitted. That is, in the deferred slot N+K, a second type PUCCH, which is of a type changed from the assigned first type PUCCH, is transmitted. Here, slot N+K is the closest slot capable of transmitting a second type PUCCH, and is a slot mainly consisting of DL symbols.

[0207] In other words, if the base station changes the configuration of a slot to which a first-type PUCCH has been assigned, and the terminal successfully receives a group-shared PDCCH and a terminal-specific PDCCH containing the slot configuration information, but the slot configuration is such that the first-type PUCCH cannot be transmitted, the terminal will not transmit the first-type PUCCH in that slot, but will instead transmit the second-type PUCCH in the nearest slot among the subsequent slots that is capable of transmitting a second-type PUCCH.

[0208] Here, the UCI transmitted via the second type PUCCH includes only the portion of the UCI originally intended for transmission, according to its importance, and excludes the remaining portion.

[0209] In one aspect, the terminal transmits some UCI information according to the importance of the UCI type that should originally be transmitted via the Type 1 PUCCH. For example, the importance or priority of UCI types that can be transmitted via the Type 1 PUCCH is defined in the order of HARQ-ACK, RI, CSI, and beam-related information (BRI, e.g., beam recovery request) (HARQ-ACK>RI>CSI>BRI). As another example, the importance or priority of UCI types that can be transmitted via the Type 1 PUCCH is defined in the order of HARQ-ACK, beam-related information, RI, and CSI (HARQ-ACK>BRI>RI>CSI). As yet another example, the importance or priority of UCI types that can be transmitted via the Type 1 PUCCH is defined in the order of beam-related information, HARQ-ACK, RI, and CSI (BRI>HARQ-ACK>RI>CSI).

[0210] In other respects, the terminal transmits certain types of UCI that are of high importance via the second type PUCCH, depending on the amount of UCI that can be transmitted via the second type PUCCH.

[0211] In other respects, if the information transmitted via Type 1 PUCCH includes information from the primary serving cell (PCell) and secondary serving cell (SCell), the terminal can transmit some of the information according to its importance or priority between the primary and secondary serving cells. For example, the terminal transmits only UCI related to the primary serving cell via Type 2 PUCCH. As another example, if the information transmitted via Type 1 PUCCH includes information from the primary serving cell and primary secondary serving cell (PSCell), the terminal transmits only UCI related to the primary serving cell or primary secondary serving cell via Type 2 PUCCH.

[0212] In another aspect, the terminal preferentially transmits UCIs for DLs linked to PUCCH-transmittable cells (e.g., SIB-linked DL Cells) on each PUSCH group via the second type PUCCH.

[0213] In other aspects, the terminal transmits a second-type PUCCH based on the importance between the primary and secondary serving cells and the importance of the UCI type. For example, the terminal transmits the highest-priority type of UCI (HARQ-ACK, beam-related information, RI, CSI, etc.) associated with the primary serving cell via the second-type PUCCH. This prioritizes which type of serving cell the UCI relates to over which type of UCI is transmitted via the second-type PUCCH. Of course, the priority of which type of UCI is transmitted via the second-type PUCCH may be prioritized over which type of serving cell it relates to. The priority between serving cells and UCIs may be transmitted to the terminal by the base station in configuration information such as RRC signaling, or it may be defined individually depending on the size of the second-type PUCCH payload.

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

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

[0216] How to process HARQ-ACK in a slot different from the one specified.

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

[0218] Here, the "assigned PUCCH" in this embodiment may be a first-type PUCCH or a second-type PUCCH. The K value is determined by the time it takes for the base station from PDSCH scheduling to PUCCH feedback. After the N+K slots, no PUCCHs for HARQ-ACK feedback from other terminals may be assigned to slots that can transmit a PUCCH. For example, if the terminal and the base station communicate with each other via the FDD (Frequency Division Duplex) infrastructure, no PUCCHs for HARQ-ACK from other terminals may be transmitted (or assigned) to slots transmitted after 4ms (common to 3GPP LTE, LTE-A, and NR). The K value is provided via the RRC signal.

[0219] A method for processing HARQ-ACKs by other means includes the steps of: the base station changing the configuration of slot N to which a first type PUCCH is assigned; the terminal receiving a group-shared PDCCH and / or terminal-specific PDCCH containing information about the changed slot configuration; and, if the first type PUCCH cannot be transmitted under the changed slot configuration but a second type PUCCH can be transmitted, the terminal waiting for the base station to reassign a PUCCH without transmitting the first type PUCCH.

[0220] As an example, such a HARQ-ACK processing method further includes the steps of: the base station retransmitting a PDSCH to a terminal that does not transmit a Type 1 PUCCH containing a HARQ-ACK of the PDSCH; and allocating a resource to which a new Type 1 PUCCH will be transmitted in the PDCCH that schedules the PDSCH.

[0221] Another method for processing HARQ-ACKs includes the steps of: the base station changing the configuration of slot N to which a PUCCH is assigned; and if the terminal was unable to receive the group-shared PDCCH that transmits the configuration information of slot N, but can learn the slot configuration of slot N by receiving a terminal-specific PDCCH that schedules a PDSCH (or PUSCH), the terminal selectively transmits the PUCCH based on the slot configuration. For example, if the slot configuration is such that the assigned PUCCH can be transmitted, the terminal transmits the PUCCH. For another example, if the slot configuration is such that the assigned PUCCH cannot be transmitted, the terminal does not transmit the PUCCH. Here, the assigned PUCCH may be a first-type PUCCH or a second-type PUCCH.

[0222] [Other examples] Other embodiments of this specification relate to information about slot configurations transmitted by a base station to a terminal, and how the terminal and base station operate based on this information. The base station informs the terminal of the slot configuration information using a variety of information and procedures. The information about slot configurations includes various embodiments such as those described below.

[0223] Information regarding slot configuration In one aspect, information regarding slot configuration includes semi-static DL / UL assignment information. For example, a base station transmits default slot format or semi-static DL / UL assignment information (or semi-static slot-format information (SFI)) to a cell-specific terminal, and additionally transmits semi-static DL / UL assignment information to the terminal via terminal-specific RRC messages. 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 whether each symbol in the relevant 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, via the semi-static DL / UL assignment information (or default slot format), symbols not designated as DL symbols or UL symbols are designated as "flexible".

[0224] In other respects, information regarding slot configuration includes dynamic slot-format information (SFI) transmitted within a group-shared PDCCH. The dynamic slot-format information indicates whether each symbol in a slot is a DL symbol, a UL symbol, or a flexible symbol that is neither a DL nor a UL symbol. Flexible symbols may substitute for gaps or be used for other purposes. The group-shared PDCCH on which the dynamic slot-format information is transmitted is scrambled with SFI-RNTI. Whether a terminal monitors the dynamic slot-format information is configured or indicated by an RRC message. Terminals not instructed to monitor by an RRC message do not monitor the dynamic slot-format information.

[0225] In other respects, information regarding the slot configuration is scheduling information contained in the DCI, which is mapped to a terminal-specific PDCCH. For example, if the DCI contains information about the start position and length of a PDSCH, the symbol to which that PDSCH is scheduled is assumed to be a DL symbol. Similarly, if the DCI contains information about the start position and length of a PUSCH, the symbol to which that PUSCH is scheduled is assumed to be a UL symbol. If the DCI contains information about the start position and length of a PUSCH for HARQ-ACK transmission, the symbol to which that PUSCH is scheduled is assumed to be a UL symbol.

[0226] Method for determining symbol direction and processing PUCCH As described above, there is a variety of information regarding slot configurations, so a terminal receives information about different types of slot configurations for the same slot. Each piece of information about a slot configuration indicates a different symbol orientation for the same slot. In this case, the terminal and base station change or determine the symbol orientation according to the following rules.

[0227] In one respect, the orientation of DL and UL symbols in semi-static DL / UL assignment information (or default slot format) is not changed by dynamic slot configuration information or scheduling information. Therefore, if a PUCCH is located on a UL symbol set by semi-static DL / UL assignment information (or default slot format), the terminal transmits the PUCCH regardless of dynamic slot configuration information or scheduling information. If at least one symbol among the symbols to which the PUCCH is assigned overlaps with a DL symbol in the default slot format, the terminal either does not transmit the PUCCH or changes the length of the PUCCH to match the length of the remaining symbols excluding the DL symbol and transmits it. Here, the assigned PUCCH may be a first-type PUCCH or a second-type PUCCH.

[0228] In other respects, flexible symbols configured by semi-static DL / UL assignment information (or default slot format) are oriented or changed by dynamic slot configuration information or scheduling information. If at least one symbol among the symbols to which a PUCCH is assigned overlaps with a flexible symbol in the semi-static DL / UL assignment information (or default slot format), the terminal decides whether or not to transmit the PUCCH based on the type of information (i.e., UCI) that the PUCCH transmits (HARQ-ACK, RI, CSI, etc.). In this embodiment, the PUCCH may be a first-type PUCCH or a second-type PUCCH.

[0229] For example, if the information transmitted via PUCCH includes a HARQ-ACK to PDSCH, the terminal will transmit the PUCCH at a predetermined location regardless of the dynamic slot configuration information communicated via the group-shared PDCCH. Here, the predetermined location is indicated by the DCI that schedules the PDSCH.

[0230] As another example, if the information transmitted in PUCCH does not include a HARQ-ACK to PDSCH, the terminal will transmit PUCCH if the flexible symbol overlapping with 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 assigned is indicated by dynamic slot configuration information as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal will not transmit PUCCH. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol to which PUCCH is assigned, the terminal will not transmit PUCCH.

[0232] In another aspect, if at least one of the symbols to which PUCCH is assigned overlaps with a flexible symbol set by semi-static DL / UL assignment, the terminal will decide whether or not to transmit PUCCH via signaling that triggers PUCCH transmission.

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

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

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

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

[0237] When the repeated PUCCH overlaps with the UL symbol If a terminal is located in a slot that has been instructed to transmit a repetitive PUCCH, and that slot is set to semi-static DL / UL assignment information (or default slot pattern) and a UL symbol, the terminal will transmit a PUCCH in that slot regardless of whether it receives dynamic slot configuration information or scheduling information. Here, the DL symbols and UL symbols in the slot configuration set by an RRC message such as semi-static DL / UL assignment information (or default slot pattern) are not oriented by dynamic slot configuration information or scheduling information.

[0238] When the repeated PUCCH overlaps with the DL symbol If, in any of the slots instructed to transmit a repeating PUCCH, at least one symbol assigned to the repeating PUCCH in each slot overlaps with a DL symbol based on semi-static DL / UL assignment information, the terminal will either not transmit the PUCCH in that slot, or will change the length of the PUCCH to match the length of the remaining symbols excluding the DL symbol and transmit it. Alternatively, if, in any of the slots instructed to transmit a repeating PUCCH, at least one symbol assigned to the PUCCH overlaps with a DL symbol set in semi-static DL / UL assignment information (or default slot pattern), the terminal will not transmit the repeating PUCCH in that slot or in subsequent slots.

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

[0240] On one hand, if, among the slots instructed to transmit a repeating PUCCH, at least one symbol among the symbols to which the repeating PUCCH is assigned in each slot overlaps with a flexible symbol set by semi-static DL / UL assignment information, the terminal will decide whether or not to transmit the repeating PUCCH based on the type of information (i.e., UCI) transmitted by the repeating PUCCH (HARQ-ACK, RI, CSI, etc.).

[0241] As an example, if the information transmitted by the repeated PUCCH includes 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 HARQ-ACK for the PDSCH, or if it includes 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 to transmit the repeated PUCCH, if at least one of the symbols allocated with the repeated PUCCH in each slot is indicated as another symbol (e.g., DL symbol or flexible symbol) that is not a UL 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 with 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, 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.

[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 to transmit the repeated PUCCH, the terminal does not perform repeated transmission of the PUCCH in subsequent slots.

[0245] On the one hand, on the other hand, if at least one symbol among the symbols to which repeated PUCCH is allocated overlaps with a flexible symbol set by semi-static DL / UL allocation, 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 symbol among the symbols to which the repeated PUCCH is allocated in each slot is indicated as another symbol (e.g., a DL symbol or a flexible symbol) other than a UL symbol by the dynamic slot configuration information, the terminal does not 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 another example, if a terminal fails to transmit a repeating PUCCH in one of the slots instructed to transmit a repeating PUCCH for any reason (such as a symbol direction inconsistency caused by dynamic slot configuration information, or the terminal failing to receive dynamic slot configuration information), the terminal will not transmit repeating PUCCHs in subsequent slots either.

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

[0251] For example, the K slots configured to transmit repeated PUCCH messages do not necessarily have to be consecutive. For instance, if a terminal is configured to transmit repeated PUCCH messages over K slots, it will repeatedly transmit PUCCH messages until the count of the number of slots that have actually transmitted a PUCCH message reaches K, excluding slots that have not transmitted a repeated PUCCH message. (Method 1 of repetition)

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

[0253] As another example, the terminal attempts to transmit a PUCCH in K consecutive slots remaining from the slot N on which PUCCH transmission is instructed, excluding slots that cannot transmit PUCCH due to semi-static DL / UL allocation information. (Iteration Method 3)

[0254] Figure 15 shows the slots through which repetitive PUCCH signals are transmitted, depending on the slot configuration.

[0255] Referring to Figure 15(a), this shows how a terminal transmits a first-type PUCCH1500 when it is configured to repeatedly transmit a first-type PUCCH1500 across two slots (slot configuration by semi-static DL / UL allocation). Here, the flexible symbol is changed to a DL symbol or a UL symbol by dynamic slot configuration information or scheduling information of the terminal-specific DCI. Assume that the symbols to which the first-type PUCCH1500 is transmitted are symbols 8 to 13 within the slot. Here, one slot contains 14 symbols, and the symbol indices range from 0 to 13.

[0256] Examining the configuration of each slot using semi-static DL / UL assignment, we find that in slot 0, symbol 0 is a DL symbol, and symbols 7 through 13 are UL symbols. In slot 1, symbols 0 through 10 are DL symbols, and symbols 12 through 13 are UL symbols. In slot 2, symbols 0 through 1 are DL symbols, and symbols 10 through 13 are UL symbols. In slot 3, symbol 0 is a DL symbol, and symbols 7 through 13 are UL symbols. The remaining symbols, excluding UL and DL symbols, are flexible symbols.

[0257] Therefore, the first type PUCCH1500 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 otherwise.

[0258] Figure 15(a) shows the slots in which the terminal attempts to transmit the first type PUCCH1500 using the iteration method 1 described above. Here, we assume 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 PUCCH. The terminal actually transmits the first type PUCCH1500 twice, in slot 0 and slot 3. Therefore, the terminal does not repeatedly transmit the first type PUCCH1500 after slot 3.

[0259] Figure 15(b) shows a slot that attempts to transmit the first type PUCCH1500 using the iteration method 2 described above. Since the two slots (K=2) are configured to repeatedly transmit the first type PUCCH1500, the terminal attempts to transmit the first type PUCCH1500 in slot 0 and slot 1. The terminal attempts to transmit the first type PUCCH in slot 1, but is unable to transmit the first type PUCCH because it overlaps with DL symbols due to the setting of semi-static DL / UL assignment information.

[0260] Figure 15(c) shows a slot attempting to transmit the first type PUCCH1500 using the iteration method 3 described above. The system is configured to repeatedly transmit the first type PUCCH1500 to two slots (K=2), but slot 1 is a slot that cannot transmit the first type PUCCH1500 due to semi-static DL / UL allocation information. Therefore, the terminal attempts to transmit the first type PUCCH1500 to slots 0 and 2. Here, slot 2 either actually transmits the first type PUCCH1500 or does not transmit it as instructed by the dynamic slot configuration information.

[0261] [Further examples] Further embodiments of the present invention relate to a method and a decision procedure relating to the transmission of a physical channel by a terminal or base station to improve physical channel coverage in a wireless communication system based on a slot configuration including DL symbols, flexible symbols, and UL symbols on a TDD substrate. The physical channel transmitted by the terminal is an uplink physical channel and includes PRACH, PUCCH, PUSCH, SRS, etc. The physical channel transmitted by the base station is a downlink physical channel and includes PDSCH, PDCCH, PBCH, etc. Procedures for the terminal and base station relating to the repeated transmission of PUCCH are defined below, procedures for the terminal and base station relating to the repeated transmission of PUSCH are defined, and procedures for the terminal and base station relating to the method of following with a repeated PDSCH are defined below. In the following embodiments, PUCCH or repeated PUCCH is a first-type PUCCH or a second-type PUCCH.

[0262] Terminal and base station procedures for PUCCH repetitive transmission The number of slots to which PUCCH is transmitted, or the number of repetitions of PUCCH transmission, is, for example, one of a predetermined number of values ​​(ie1, 2, 4, 8), and the value set on the actual terminal from this number of values ​​is transmitted by RRC message. If the number of repetitions of PUCCH transmission is set to 1, it will instruct a general PUCCH rather than a repetitive PUCCH.

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

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

[0269] As another example, if the indicated symbol is a DL symbol or a flexible symbol, the terminal postpones the transmission of the PUCCH to the next slot; if the indicated symbol is a UL symbol, the terminal transmits the PUCCH in that slot. Any PUCCH not transmitted in that slot is postponed to the next slot.

[0270] The terminal repeatedly transmits PUCCH on multiple slots until it reaches the number of iterations of the PUCCH transmission configured by RRC messages. When determining the slot for PUCCH transmission on multiple slots, the terminal considers the UL symbols and Unknown (or Flexible) symbols based on the information transmitted in the RRC messages. As an example, the terminal determines the slots in which the PUCCH start position and the number of UL symbols are included in the UL symbols and Flexible symbols configured by the RRC messages as slot resources for PUCCH transmission. The base station then receives the PUCCH repeatedly transmitted by the terminal via multiple slots based on at least one of the UL-DL configuration shared information and the UL-DL configuration dedicated information.

[0271] If at least one symbol among the symbols to which a PUCCH is transmitted in the first slot of the slots assigned to transmit a repetitive PUCCH coincides with a DL symbol, the terminal will cancel the PUCCH transmission in that slot without transmitting the PUCCH. In other words, if the symbols to which a PUCCH is transmitted in the first slot of the slots assigned to transmit a repetitive PUCCH consist of a UL symbol (etc.) and a flexible symbol, the terminal will transmit the PUCCH in that slot. Also, if at least one symbol among the symbols to which a PUCCH is transmitted after the first slot of the slots assigned to transmit a repetitive PUCCH coincides with a DL symbol or a flexible symbol, the terminal will cancel the PUCCH transmission in that slot without transmitting the PUCCH. In other words, if the slot to which a PUCCH transmission is instructed by the base station, and the symbols of the said slot that instructed the transmission of the PUCCH, consist of a UL symbol (etc.), the terminal will transmit the PUCCH in that slot.

[0272] The following describes PUCCH's processing method for gap symbols.

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

[0274] Within each slot where PUCCH transmission is instructed by the base station, if the symbol to which PUCCH is transmitted overlaps with a symbol (or) composed of semi-static UL / DL assignment information (at least one of UL-DL configuration shared information and UL-DL configuration exclusive information), the terminal determines whether to transmit the PUCCH based on the type (or direction) of the instructed symbol (or).

[0275] For example, if all of the indicated symbols(rar) are UL symbols, the terminal transmits a PUCCH; however, if at least one of the indicated symbols(rar) consists of a DL symbol or at least one of the G consecutive flexible symbols(rar) immediately following the DL symbol, the terminal does not transmit a PUCCH in that slot. The terminal postpones any PUCCH not transmitted in that slot to the next slot.

[0276] In other words, within a slot instructed by the base station to transmit a PUCCH, if the symbol to which the PUCCH is to be transmitted is a UL symbol, the terminal transmits the PUCCH. However, if the symbol to which the PUCCH is to be transmitted is a DL symbol or at least one of the G consecutive flexible symbols immediately following the DL symbol, the terminal does not transmit the PUCCH in that slot. The terminal postpones any PUCCH not transmitted in that slot to the next slot. In short, if a PUCCH is to be transmitted with a DL symbol and any of the G symbols available as a gap, it is not transmitted and the transmission is postponed to the next slot.

[0277] On the other hand, regarding the PUCCH processing method in multiple slots, the terminal repeatedly transmits PUCCH until it reaches the number of iterations of the PUCCH transmission configured by RRC messages on the multiple slots. The terminal determines the slot for PUCCH transmission on the multiple slots based on the type and number of symbols transmitted in the RRC messages.

[0278] The terminal determines a slot for PUCCH transmission based on the number of UL symbols, flexible symbols, and gap symbols configured by semi-static UL / DL assignment information. For example, if "number of UL symbols + number of flexible symbols - number of gap symbols" in a slot includes the starting position of the PUCCH and the number of UL symbols to which the PUCCH is transmitted, the terminal determines that slot as a slot for PUCCH transmission and transmits the PUCCH. Alternatively, considering that one slot contains 14 symbols, if "14 - (number of DL symbols in the slot + number of gap symbols)" includes the starting position of the PUCCH and the number of UL symbols to which the PUCCH is transmitted, the terminal determines that slot as a slot for PUCCH transmission and transmits the PUCCH.

[0279] In this case, the base station receives PUCCHs that the terminal repeatedly transmits via multiplex slots based on at least one of the UL-DL configuration shared information and the UL-DL configuration dedicated information.

[0280] Figure 16 shows whether PUCCH transmission is possible depending on the slot configuration.

[0281] Referring to Figure 16, the slot configuration formed by the semi-static DL / UL allocation information sequentially includes five DL symbols (represented as "D"), three flexible symbols (represented as "X"), and six UL symbols (represented as "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, Figure 16(a) shows the case where there is one symbol as a gap (G=1). If G=1, PUCCH assignments #0 and #1, which do not overlap with the immediately following flexible symbol of the DL symbol, can be transmitted, but PUCCH assignment #2, which overlaps with the immediately following flexible symbol of the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH assignment #2 is postponed to the next slot. Of course, the terminal will use the same criteria to determine whether or not to transmit PUCCH assignment #2 in the next slot.

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

[0285] Terminal and base station procedures for PUSCH repetitive transmission The number of slots to which PUSCH is transmitted, or the number of repetitions of PUSCH transmission, is, for example, one of a predetermined number of values ​​(ie1, 2, 4, 8), and the value set on the actual terminal from this number of values ​​is transmitted by RRC message. If the number of repetitions of PUSCH transmission is set to 1, it will instruct a general PUSCH rather than a repetitive PUSCH.

[0286] In the case of PUSCH, PUSCH is transmitted only in slot configurations among the K consecutive slots that are suitable for PUSCH transmission, and no postponement operation of PUSCH transmission is performed.

[0287] The start and length of the symbols in which a PUSCH is transmitted within a slot are indicated by the DIC, and these are maintained the same across all slots. The terminal determines whether to transmit the PUSCH indicated by the DCI. Such determination is based on semi-static DL / UL assignment information. The semi-static DL / UL assignment information used for said determination includes at least one of the UL-DL configuration shared information indicated by RRC signaling and, in addition, UL-DL configuration exclusive information indicated to the terminal by RRC signaling.

[0288] As an example, UL-DL configuration shared information is used to specify the period for applying semi-static DL / UL allocation information and to set the slot format, which consists of the number of UDL symbols per slot, the number of DL UL symbols per slot, and the number of flexible symbols per slot, configured across multiple slots included in that period, as well as the number of slots. In other words, the terminal configures the slot format for each slot across the number of slots specified by the UL-DL configuration shared information. As another example, UL-DL configuration-specific information includes information for replacing flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and other flexible symbols. In other words, the terminal replaces the flexible symbols in the slot format provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration-specific information.

[0289] Within each slot where PUSCH transmission is instructed by the base station, if the symbol to which PUSCH is transmitted overlaps with a symbol(rar) indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration shared information and UL-DL configuration exclusive information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the indicated symbol(rar).

[0290] For example, if at least one of the specified symbols (rar) is a DL symbol, the terminal will not transmit the PUSCH and will cancel the PUSCH transmission. Also, if the specified symbols (rar) are a UL symbol (rar) and a flexible symbol (rar), the terminal will transmit the PUSCH in the corresponding slot.

[0291] As another example, if at least one of the indicated symbols(rar) is a DL symbol or a flexible symbol(rar), the terminal will not transmit a PUSCH and will cancel the transmission of the PUSCH. Also, if the indicated symbols(rar) is a UL symbol, the terminal will transmit a PUSCH in the corresponding slot.

[0292] If at least one symbol among the symbols to which a PUSCH is transmitted in the first slot of a slot to which a repeating PUSCH transmission is assigned overlaps with a DL symbol, the terminal will cancel the PUSCH transmission in that slot without transmitting the PUSCH. In other words, if the symbols to which a PUSCH is transmitted in the first slot of a slot to which a repeating PUSCH transmission is instructed consist of a UL symbol (etc.) and a flexible symbol, the terminal will transmit the PUSCH in that slot. Also, if at least one symbol among the symbols to which a PUSCH is transmitted in any slot after the first slot of a slot to which a repeating PUSCH transmission is instructed overlaps with a DL symbol or a flexible symbol, the terminal will cancel the PUSCH transmission in that slot without transmitting the PUSCH. In other words, if the symbols to which a PUSCH is instructed to be transmitted in any slot after the first slot of a slot to which a repeating PUSCH transmission is instructed consist of a UL symbol (etc.), the terminal will transmit the PUSCH in that slot.

[0293] The following describes how PUSCH processes gap symbols.

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

[0295] Within each slot where PUSCH transmission is instructed by the base station, if the symbol to which PUSCH is transmitted overlaps with a symbol (or other symbol) instructed by semi-static UL / DL assignment information (at least one of UL-DL configuration shared information and UL-DL configuration exclusive information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the instructed symbol.

[0296] For example, if all of the indicated symbols are UL symbols, the terminal transmits a PUSCH signal; however, if at least one of the indicated symbols is a DL symbol or one of the G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit a PUSCH signal in that slot.

[0297] In other words, within a slot where a PUSCH transmission is instructed by the base station, if the symbol to which the PUSCH is transmitted is a UL symbol, the terminal transmits the PUSCH. However, if at least one of the symbols to which the PUSCH is transmitted is a DL symbol or at least one of the G consecutive flexible symbols immediately following the DL symbol, the terminal cancels the transmission of the PUSCH without transmitting it. In other words, if a PUSCH is transmitted with a DL symbol and any of the G symbols available as a gap, the transmission is not transmitted and the transmission of the PUSCH is canceled.

[0298] Terminal and base station procedures for repeated reception of PDSCH The number of slots that receive PDSCH or the number of repetitions of PDSCH reception is, for example, one of a predetermined number of values ​​(ie1, 2, 4, 8), and the value actually set on the terminal from this number of values ​​is transmitted by RRC message. If the number of repetitions of PDSCH reception is set to 1, a general PDSCH will be instructed instead of a repetitive PDSCH.

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

[0300] As an example, UL-DL configuration shared information is used to specify the period for applying semi-static DL / UL allocation information and to set the slot format and the number of slots, which are 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, which are configured across multiple slots included in that period. In other words, the terminal configures the slot format for each slot across the number of slots specified by the UL-DL configuration shared information. As another example, UL-DL configuration-specific information includes information for replacing flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. In other words, the terminal replaces the flexible symbols in the slot configuration provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration-specific information.

[0301] In a slot where PDSCH reception has been instructed by the base station, if the symbol from which the terminal receives the PDSCH overlaps with a symbol (or other symbol) indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration shared information and UL-DL configuration exclusive information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

[0302] For example, if at least one of the specified symbols is a UL symbol, the terminal will not receive the PDSCH. Conversely, if the specified symbols are a DL symbol and a flexible symbol, the terminal will receive the PDSCH in the corresponding slot.

[0303] As another example, if at least one of the indicated symbols(rar) is a UL symbol or an Unknown (or a Flexible symbol(rar)), the terminal will not receive the PDSCH. Conversely, if the indicated symbols(rar) are DL symbols, the terminal will receive the PDSCH in the corresponding slot.

[0304] If at least one symbol among the symbols that receive a PDSCH in the first slot of a set of slots instructed to receive a repetitive PDSCH coincides with a UL symbol, the terminal will not receive the PDSCH in that slot. In other words, if the symbols that receive a PDSCH in the first slot of a set of slots instructed to receive a repetitive PDSCH consist of a DL symbol and a flexible symbol, the terminal will receive the PDSCH in that slot. Also, if at least one symbol among the symbols that receive a PDSCH in any slot after the first slot of a set of slots instructed to receive a repetitive PDSCH coincides with a UL symbol or a flexible symbol, the terminal will not receive the PDSCH in that slot. In other words, if the symbols instructed by the base station to receive a PDSCH in any slot after the first slot of a set of slots instructed to receive a repetitive PDSCH, and the symbols instructed to transmit the PDSCH in that slot, consist of a DL symbol, the terminal will receive the PDSCH in that slot. On the other hand, the terminal will receive any additional PDSCHs that could not be received in the next slot that was postponed.

[0305] The following describes the PDSCH processing method for gap symbols.

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

[0307] In a slot where PDSCH reception has been instructed by the base station, if the symbol on which the PDSCH is received overlaps with a symbol (or other symbol) indicated by semi-static UL / DL assignment information (at least one of UL-DL configuration shared information and UL-DL configuration exclusive information), the terminal determines whether to receive the PDSCH based on the type (or direction) of the indicated symbol.

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

[0309] In other words, within a slot instructed by the base station to receive a PDSCH, if the symbol to which the PDSCH is received is a DL symbol, the terminal receives the PDSCH. However, if the symbol to which the PDSCH is received is a UL symbol or at least one of the G consecutive flexible symbols immediately preceding the UL symbol, the terminal does not receive the PDSCH. That is, if the symbol to which the PDSCH is transmitted is a UL symbol and any of the G symbols available as a gap, the PDSCH is not transmitted and the transmission of the PDSCH is canceled. The base station then postpones the transmission of the PDSCH to the next slot.

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

[0311] In one respect, if a PDSCH reception is canceled, the new HARQ-ARQ timing is determined by the PDSCH that was not canceled and was received. In other words, the terminal uses the HARQ-ACK timing included in the DCI that instructs the reception of the PDSCH and the last received PDSCH, excluding the canceled PDSCH, to determine which slot the actual HARQ-ACK will be transmitted to. For example, a terminal instructed to transmit HARQ-ACK to slot 4 and beyond will transmit HARQ-ACK from the slot where the last PDSCH was received.

[0312] In other respects, even if the reception of a PDSCH is canceled, the HARQ-ARQ timing remains unchanged and is determined assuming that the PDSCH is received. That is, the terminal uses the HARQ-ACK timing included in the DCI that instructs the reception of the PDSCH and the last PDSCH before the decision on cancellation to determine which slot the actual HARQ-ACK will be transmitted to. For example, a terminal instructed to transmit 4 slots as the HARQ-ACK timing will transmit HARQ-ACKs from the last slot of the assigned PDSCH to slots 4 and beyond, even if the reception of the PDSCH is canceled.

[0313] On the other 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) across multiple slots, the method by which the terminal performs inter-slot frequency hopping needs to be defined. In this embodiment, we disclose which physical resource block (PRB) is used to transmit PUCCH (or PDSCH, PUSCH) in each slot during inter-slot frequency hopping. Furthermore, this embodiment discloses an algorithm that determines the PRB based on the difference between the current slot and the slot where PUCCH is first transmitted, regardless of the number of PUCCH 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 PUCCH transmission based on the index of the first slot and the index of the second slot where the repeated PUCCH is first transmitted. Here, in 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 indexes of the first hop and the second hop, which are signaled to 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 while PUSCH is repeatedly transmitted 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, in 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 indexes of the first hop and the second hop, which are signaled to and configured for the terminal via the RRC message. n repeat (ns ) is slot n s This refers to the number of repetitions of a PUCCH transmission in previous methods. In this method, PUCCHs are transmitted via two different hops, regardless of the delay of the repetition PUCCH.

[0320] [Further examples] Further embodiments of this specification disclose a method for determining which of a number of slots to repeatedly transmit PUCCH across multiple slots in order to improve PUCCH coverage, as well as a determination procedure for determining which slot to use for repeated PUCCH transmission.

[0321] The following discloses a method by which a terminal determines which slot to use for PUCCH transmission from among a number of slots.

[0322] In one aspect, the terminal determines a slot for PUCCH transmission based on an SS / PBCH block containing synchronization signals for RRM (radio resource management) measurement and information regarding initial cell access. The SS / PBCH block may be transmitted at a predetermined location, and the settings for the transmission of the SS / PBCH block are transmitted from the base station to the terminal via an RRC message (ie. SSB_transmitted-SIB1 information or SSB_transmitted) and configured at the terminal. In the slot indicated by the settings for the transmission of the SS / PBCH block, there are flexible symbols that can transmit the SS / PBCH block. That is, flexible symbols are used not only for PUCCH transmission but also for the transmission of SS / PBCH blocks containing synchronization and initial cell access information. In this case, there is a possibility that the flexible symbols on which the SS / PBCH block is transmitted and the flexible symbols that can transmit PUCCH may overlap at least partially.

[0323] As an example, the terminal prevents collisions by determining the slots for repeated PUCCH transmission in a manner that excludes slots containing the overlapping symbols from the slots for repeated PUCCH transmission. 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 across the number of slots, the base station receives the repeated PUCCH from the terminal.

[0324] In other aspects, the terminal determines the slot for PUCCH transmission based on semi-static DL / UL allocation information and gaps.

[0325] In this specification, we assume that the gap is located immediately before the symbol for PUCCH transmission, and that the gap contains one or two symbols. However, the location and number of symbols in the DL-UL switching gap between DL and UL can be configured in various ways depending on the base station and terminal settings. For example, the gap may contain two or more symbols, and the terminal may consider two or more gap symbols to determine the slot for PUCCH transmission or whether to postpone PUCCH transmission.

[0326] On the other hand, slot determination is based on at least one of the following: whether or not a PDSCH can be allocated within the slot; whether or not a control resource set (CORESET) for PDCCH monitoring can be allocated to a DL symbol within the slot; whether or not a CSI-RS can be allocated within the slot; whether or not an SS / PBCH block can be allocated within the slot; and semi-static DL / UL allocation information.

[0327] For example, to determine a PUCCH transmission resource using a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol (etc.) and PDSCH is assigned to the DL symbol (etc.), the terminal does not consider the flexible symbol as a resource for PUCCH transmission. Instead, the terminal determines the slot containing the flexible symbol (etc.) along with other UL symbols as the slot for PUCCH transmission. If the symbol immediately preceding the flexible symbol is a DL symbol (etc.) and PDSCH is not assigned to the DL symbol (etc.), the flexible symbol becomes an unassigned symbol. Therefore, the terminal does not consider the unassigned symbol as a gap for DL-UL switching. The terminal then considers the flexible symbol immediately following the DL symbol (etc.) as a resource capable of repeated PUCCH transmission and determines it as the slot for PUCCH transmission.

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

[0329] As another example, in order to determine a PUCCH transmission resource using a flexible symbol, if the symbol immediately preceding the flexible symbol is a DL symbol (etc.) and a CORESET or search space for PDCCH monitoring is assigned to the DL symbol (etc.), the terminal does not perform monitoring of the assigned PDCCH and instead considers the flexible symbol as a resource capable of repeated PUCCH transmission and determines it to be a slot for PUCCH transmission.

[0330] As another example, a terminal uses semi-static DL / UL allocation information to determine a slot for PUCCH transmission. The terminal knows which slot and which symbol PUCCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUCCH overlaps with a flexible symbol indicated in the semi-static DL / UL allocation information, and the symbol immediately preceding the symbol instructed to transmit PUCCH is not a DL symbol indicated in the semi-static DL / UL allocation information, the terminal determines that the slot is for repetitive PUCCH transmission and transmits PUCCH in that slot. On the other hand, if the symbol immediately preceding the symbol to which PUCCH is transmitted is a DL symbol indicated in the semi-static DL / UL allocation information, the terminal does not transmit repetitive PUCCH in that slot and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUCCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol that will transmit a PUCCH is a DL symbol in the semi-static DL / UL assignment information, the terminal will not transmit a PUCCH in that slot; otherwise, the terminal will transmit a PUCCH in that slot. This is because a switching gap is required between DL and UL. Any PUCCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0331] As yet another example, a terminal uses scheduled information to determine a slot for PUCCH transmission. The terminal knows which slot and which symbol PUCCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUCCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and no PDSCH is scheduled for the symbol immediately preceding the symbol instructed to transmit PUCCH, the terminal determines that slot is for PUCCH transmission and transmits PUCCH in that slot. On the other hand, if a PDSCH is scheduled for the symbol immediately preceding the symbol to which PUCCH is to be transmitted, the terminal does not transmit PUCCH in that slot and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUCCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if a PDSCH is scheduled for the symbol immediately preceding the symbol on which the PUCCH will be transmitted, the terminal will not transmit the PUCCH in that slot; otherwise, the terminal will transmit the PUCCH in that slot. This is because a switching gap is required between DL and UL. Any PUCCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0332] As another example, a terminal uses the CSI-RS information configured on the terminal to determine the slot for PUCCH transmission. The terminal knows which slot and which symbol PUCCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUCCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and CSI-RS reception is not configured on the symbol immediately preceding the symbol instructed to transmit PUCCH, the terminal determines that slot is for PUCCH transmission and transmits PUCCH in that slot. On the other hand, if CSI-RS reception is configured on the symbol immediately preceding the symbol to which PUCCH is transmitted, the terminal does not transmit PUCCH in that slot and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRIPRI) which symbols will transmit a PUCCH per slot. If at least one of these symbols overlaps with a DL symbol in semi-static DL / UL assignment information, or if a CSI-RS reception is configured for the symbol immediately preceding the symbol on which the PUCCH will be transmitted, the terminal will not transmit the PUCCH in that slot; otherwise, the terminal will transmit the PUCCH in that slot. This is because a switching gap is required between DL and UL. Any PUCCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0333] As yet another example, a terminal uses PDCCH monitoring information configured on the terminal to determine a slot for PUCCH transmission. The terminal knows which slot and which symbol PUCCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUCCH overlaps with a flexible symbol in semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) to the symbol immediately preceding the symbol instructed to transmit PUCCH, the terminal determines that slot is for PUCCH transmission and transmits PUCCH in that slot. On the other hand, if PDCCH monitoring is configured (or assigned) to the symbol immediately preceding the symbol to which PUCCH is transmitted, the terminal does not transmit PUCCH in that slot and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUCCH per slot. If at least one of these symbols overlaps with a DL symbol in semi-static DL / UL assignment information, or if PDCCH monitoring is configured on the symbol immediately preceding the symbol to which the PUCCH will be transmitted, the terminal will not transmit the PUCCH in that slot; otherwise, the terminal will transmit the PUCCH in that slot. This is because a switching gap is required between DL and UL. Any PUCCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0334] As another example, a terminal knows which slot and symbol should transmit a PUCCH via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit a PUCCH overlaps with a flexible symbol indicated in semi-static DL / UL allocation information, and the symbol immediately preceding the symbol instructed to transmit a PUCCH does not overlap with an SS / PBCH block, the terminal determines that the slot is for PUCCH transmission and transmits the PUCCH in that slot. On the other hand, if the symbol immediately preceding the symbol to which the PUCCH is to be transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUCCH in that slot and postpones the PUCCH transmission to the next available slot. In other words, the terminal knows from the RRC message and / or dynamic signaling (egPRI) which symbols will transmit a PUCCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol to which the PUCCH will be transmitted overlaps with an SS / PBCH block, the terminal will not transmit the PUCCH in that slot; otherwise, the terminal will transmit the PUCCH in that slot. This is because a switching gap is required between DL and UL. The PUCCH that could not be transmitted here is deferred to be transmitted in the next available slot.

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

[0336] In this embodiment, if a symbol indicated by a DL symbol via dynamic signaling (Dynamic SFI) in one slot ends with the symbol immediately preceding the symbol for repetitive PUCCH transmission, and the PUCCH resource is configured so that transmission for repetitive PUCCH begins from the next symbol, the terminal will not transmit the PUCCH in that slot and will postpone it to a subsequent slot. The postponed slot is the earliest slot among the slots to which the PUCCH will be transmitted.

[0337] The following will explain, through more specific examples, how a terminal determines which slot to use for PUCCH transmission based on the availability of PDSCH assignment within a slot. Here, we assume that one slot contains 14 symbols.

[0338] For example, suppose the UL symbol resource for PUCCH is set with the last 12 symbols, and a particular slot contains two DL symbols, two flexible symbols, and ten UL symbols in sequence. If PDSCH is assigned to the two DL symbols immediately preceding the two flexible symbols, the terminal implicitly considers the first flexible symbol as the DL-UL switching gap. The terminal then determines whether the remaining flexible symbol and the ten UL symbols, excluding the first flexible symbol, are selectable as PUCCH resources. However, because the UL symbol resource for PUCCH is set with the last 12 symbols of the slot, the terminal excludes the slot from being a slot resource for PUCCH transmission. In the above example, if the UL symbol resource for PUCCH were set with the last 11 symbols of the slot, the terminal would decide to use the slot as a slot resource for PUCCH transmission. Furthermore, suppose, for example, that the UL symbol resource for PUCCH is set with the last six symbols, and a particular slot sequentially contains eight DL symbols, two flexible symbols, and four UL symbols. If PDSCH is assigned to the first eight DL symbols, the terminal implicitly considers the first flexible symbol as the switching gap between DL and UL. The terminal then determines whether the remaining flexible symbol and four UL symbols, excluding the first flexible symbol, can be selected as PUCCH resources. However, because the UL symbol resource for PUCCH is set with the last six symbols of the slot, the terminal excludes the slot from being a slot resource for PUCCH transmission. In the above example, if the UL symbol resource for PUCCH were set with the last five symbols of the slot, the terminal would determine that the slot is a slot resource for PUCCH transmission.

[0339] [Further examples] Further embodiments of this specification disclose, in addition to methods and determination procedures for repeatedly transmitting PUSCH across multiple slots to improve PUSCH coverage, methods for determining which of a number of slots to use for repeated PUSCH transmission.

[0340] On the other hand, the determination of the slot to transmit PUSCH is based on at least one of the following: whether PDSCH can be allocated within the slot, whether a control resource set for PDCCH monitoring can be allocated to a DL symbol within the slot, whether CSI-RS can be allocated within the slot, whether SS / PBCH blocks can be allocated within the slot, and semi-static DL / UL allocation information.

[0341] As an example, a terminal uses semi-static DL / UL allocation information to determine a slot for PUSCH transmission. The terminal learns which slot and symbol PUSCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If the symbol for which PUSCH transmission is instructed coincides with a flexible symbol indicated in the semi-static DL / UL allocation information, and the symbol immediately preceding the symbol for which PUSCH transmission is instructed is not a DL symbol indicated in the semi-static DL / UL allocation information, the terminal determines that the slot is for PUSCH transmission and transmits PUSCH in that slot. On the other hand, if the symbol immediately preceding the symbol for which PUSCH is transmitted is a DL symbol indicated in the semi-static DL / UL allocation information, the terminal does not transmit PUSCH in that slot and postpones the PUSCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUSCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol to which the PUSCH will be transmitted is a DL symbol in the semi-static DL / UL assignment information, the terminal will not transmit a PUSCH in that slot; otherwise, the terminal will transmit a PUSCH in that slot. This is because a switching gap is required between DL and UL. Any PUSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0342] As another example, a terminal uses scheduled information to determine a slot for a PUSCH transmission. The terminal knows which slot and which symbol the PUSCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit a PUSCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and no PDSCH is scheduled for the symbol immediately preceding the symbol instructed to transmit the PUSCH, the terminal determines that slot is for the PUSCH transmission and transmits the PUSCH in that slot. On the other hand, if a PDSCH is scheduled for the symbol immediately preceding the symbol to which the PUSCH is to be transmitted, the terminal does not transmit the PUSCH in that slot and postpones the PUSCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUSCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if a PDSCH is scheduled for the symbol immediately preceding the symbol on which the PUSCH will be transmitted, the terminal will not transmit the PUSCH in that slot; otherwise, the terminal will transmit the PUSCH in that slot. This is because a switching gap is required between DL and UL. Any PUSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0343] As another example, a terminal uses the CSI-RS information configured on the terminal to determine the slot for PUSCH transmission. The terminal knows which slot and which symbol PUSCH should be transmitted via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUSCH overlaps with a flexible symbol indicated by semi-static DL / UL assignment information, and CSI-RS reception is not configured on the symbol immediately preceding the symbol instructed to transmit PUSCH, the terminal determines that slot is for PUSCH transmission and transmits PUSCH in that slot. Conversely, if CSI-RS reception is configured on the symbol immediately preceding the symbol to which PUSCH is transmitted, the terminal does not transmit PUSCH in that slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUSCH per slot. If at least one of these symbols overlaps with a DL symbol in semi-static DL / UL assignment information, or if a CSI-RS reception is configured for the symbol immediately preceding the symbol on which the PUSCH will be transmitted, the terminal will not transmit a PUSCH in that slot; otherwise, the terminal will transmit a PUSCH in that slot. This is because a switching gap is required between DL and UL. Any PUSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0344] As another example, a terminal uses PDCCH monitoring information configured on the terminal to determine the slot for PUSCH transmission. The terminal knows which slot and which symbol PUSCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit PUSCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) to the symbol immediately preceding the symbol instructed to transmit PUSCH, the terminal determines that the slot is for PUSCH transmission and transmits PUSCH in that slot. Conversely, if PDCCH monitoring is configured (or assigned) to the symbol immediately preceding the symbol to which PUSCH is transmitted, the terminal does not transmit PUSCH in that slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit a PUSCH per slot. If at least one of these symbols overlaps with a DL symbol in semi-static DL / UL assignment information, or if PDCCH monitoring is configured on the symbol immediately preceding the symbol to which the PUSCH will be transmitted, the terminal will not transmit a PUSCH in that slot; otherwise, the terminal will transmit a PUSCH in that slot. This is because a switching gap is required between DL and UL. Any PUSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0345] As another example, a terminal knows which slot and symbol should transmit a PUSCH via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to transmit a PUSCH overlaps with a flexible symbol indicated in semi-static DL / UL assignment information, and the symbol immediately preceding the symbol instructed to transmit a PUSCH does not overlap with an SS / PBCH block, the terminal determines that the slot is for PUSCH transmission and transmits the PUSCH in that slot. Conversely, if the symbol immediately preceding the symbol to which the PUSCH is transmitted overlaps with an SS / PBCH block, the terminal does not transmit the PUSCH in that slot. In other words, the terminal knows from the RRC message and / or dynamic signaling (egPRI) which symbols will transmit a PUSCH per slot. If at least one of these symbols overlaps with a DL symbol in the semi-static DL / UL assignment information, or if the symbol immediately preceding the symbol to which the PUSCH will be transmitted overlaps with an SS / PBCH block, the terminal will not transmit a PUSCH in that slot; otherwise, the terminal will transmit a PUSCH in that slot. This is because a switching gap is required between DL and UL. Any PUSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0346] As one embodiment of the present invention, since the DL-UL switching gap between DL and UL is set in various ways depending on the settings of the base station and terminal, in this invention, when considering the symbol immediately preceding the symbol for transmitting PUSCH, the transmission and postponement of PUSCH are mainly explained using at least one symbol as an example. However, since the DL-UL switching gap is set in various ways depending on the settings of the base station and terminal, the number of relevant symbols is diverse, and for example, the transmission and postponement of PUSCH may be determined by considering one or more symbols.

[0347] [Further examples] Further embodiments of this specification disclose, in addition to methods and determination procedures for repeatedly transmitting PDSCH across multiple slots to improve PDSCH coverage, methods for determining which of a number of slots to use for repeated PDSCH transmission.

[0348] On the other hand, the determination of the slot that receives PDSCH is based on at least one of the following within the slot: whether PUSCH can be assigned, whether PUCCH can be assigned, whether SRS transmission can be assigned, whether PRACH transmission can be assigned, and semi-static DL / UL assignment information.

[0349] As an example, a terminal uses semi-static DL / UL assignment information to determine which slot to receive a PDSCH. The terminal learns which slot and which symbol the PDSCH should be received on via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to receive the PDSCH coincides with a flexible symbol instructed by the semi-static DL / UL assignment information, and the symbol immediately following the symbol instructed to receive the PDSCH is not a UL symbol instructed by the semi-static DL / UL assignment information, the terminal determines that the slot is for receiving the PDSCH and receives the PDSCH in that slot. Conversely, if the symbol immediately following the symbol instructed to receive the PDSCH is a UL symbol instructed by the semi-static DL / UL assignment information, the terminal does not receive the PDSCH in that slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will receive a PDSCH for each slot, and if at least one of those symbols coincides with a UL symbol in the semi-static DL / UL assignment information, or if the symbol immediately following the symbol that transmits the PDSCH is a UL symbol in the semi-static DL / UL assignment information, the terminal will not receive a PDSCH in that slot; otherwise, the terminal will receive a PDSCH in that slot.

[0350] As another example, a terminal uses uplink information scheduled for the terminal (such as PUSCH, PUCCH, PRACH, SRS) to determine the slot for PDSCH reception. The terminal knows which slot and which symbol PDSCH should be received via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to receive PDSCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and no PUSCH, PUCCH, PRACH, or SRS is scheduled for the symbol immediately following the symbol instructed to receive PDSCH, the terminal determines that the slot is for PDSCH reception and receives PDSCH in that slot. Conversely, if PUSCH, PUCCH, PRACH, or SRS is scheduled for the symbol immediately following the symbol in which PDSCH is received, the terminal does not receive PDSCH in that slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will receive a PDSCH for each slot. If at least one of these symbols coincides with a UL symbol in semi-static DL / UL assignment information, or if a PUSCH, PUCCH, PRACH, or SRS is scheduled for the symbol immediately following the symbol that transmits the PDSCH, the terminal will not receive a PDSCH in that slot; otherwise, the terminal will receive a PDSCH in that slot. Here, PUCCH is a PUCCH that transmits a HARQ-ACK. Alternatively, PUCCH may be a PUCCH that transmits an SR (scheduling request).

[0351] Another example is when a terminal uses the CSI-RS information configured on the terminal to determine the slot for PDSCH transmission. The terminal knows which slot and which symbol the PDSCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to receive the PDSCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and CSI-RS reception is not configured on the symbol immediately preceding the symbol instructed to receive the PDSCH, the terminal determines that slot is for PDSCH transmission and transmits the PDSCH in that slot. On the other hand, if CSI-RS reception is configured on the symbol immediately preceding the symbol in which the PDSCH is transmitted, the terminal does not transmit the PDSCH in that slot and postpones the PDSCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit the PDSCH per slot. If at least one of these symbols overlaps with the DL symbol in the semi-static DL / UL assignment information, or if a CSI-RS reception is configured for the symbol immediately preceding the symbol on which the PDSCH will be transmitted, the terminal will not transmit the PDSCH in that slot; otherwise, the terminal will transmit the PDSCH in that slot. This is because a switching gap is required between DL and UL. The PDSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0352] As yet another example, a terminal uses PDCCH monitoring information configured on the terminal to determine a slot for PDSCH transmission. The terminal knows which slot and which symbol the PDSCH should be transmitted in via RRC messages and dynamic signaling (egPRI). If at least one of the symbols instructed to receive the PDSCH overlaps with a flexible symbol instructed by semi-static DL / UL assignment information, and PDCCH monitoring is not configured (or assigned) to the symbol immediately preceding the symbol on which the PDSCH is transmitted, the terminal determines that the slot is for PDSCH transmission and transmits the PDSCH in that slot. On the other hand, if PDCCH monitoring is configured (or assigned) to the symbol immediately preceding the symbol on which the PDSCH is transmitted, the terminal does not transmit the PDSCH in that slot and postpones the PDSCH transmission to the next available slot. In other words, the terminal knows from RRC messages and / or dynamic signaling (egPRI) which symbols will transmit PDSCH on a per-slot basis. If at least one of these symbols overlaps with the DL symbol in the semi-static DL / UL assignment information, or if PDCCH monitoring is configured on the symbol immediately preceding the symbol on which the PDSCH will be transmitted, the terminal will not transmit the PDSCH in that slot; otherwise, the terminal will transmit the PDSCH in that slot. This is because a switching gap is required between DL and UL. Any PDSCH that could not be transmitted here is deferred to be transmitted in the next available slot.

[0353] As another example, an SS / PBCH block is configured to overlap with the DL symbols, flexible symbols, and UL symbols of the semi-static DL / UL assignment information for the terminal. In this case, the terminal considers the symbols that overlap with the SS / PBCH block as semi-static DL symbols. That is, if a semi-static DL symbol is configured on the terminal and an 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 that overlaps 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 set in various ways depending on the settings of the base station and terminal, in this invention, when considering the symbol immediately following the symbol for PDSCH transmission, the transmission and postponement of PDSCH are mainly explained by giving at least one symbol as an example. However, since the DL-UL switching gap is set in various ways depending on the settings of the base station and terminal, the number of relevant symbols is diverse, and for example, the transmission and postponement of PDSCH may be determined by considering one or more symbols.

[0355] [Further examples] Further embodiments of this specification relate to a situation in which the interval between a DL symbol for which downlink reception is required and a UL symbol for which uplink transmission is required is insufficient, and the terminal is unable to perform downlink reception and uplink transmission. A minimum DL-UL switching gap is required between the terminal's downlink reception and uplink transmission. Here, the DL-UL switching gap may be used interchangeably with the switching gap or simply the gap, and these are merely different expressions but all have equivalent meanings.

[0356] The length of the DL-UL switching gap can vary depending on the carrier frequency. For example, when the carrier frequency is 6 GHz or less (hereinafter referred to as frequency range (FR1)1), a DL-UL switching gap of 13 us is required. Alternatively, when the carrier frequency is 6 GHz or higher (hereinafter referred to as FR2), a DL-UL switching gap of 7 us is required.

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

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

[0359] [Table 5]

[0360] Table 6 shows other examples of the number of symbols required for the DL-UL switching gap based on the subcarrier interval.

[0361] [Table 6]

[0362] The following describes a method for processing the uplink channel or uplink signal based on the downlink signal and DL-UL switching gap (G) received by the terminal. In this embodiment, the downlink signal includes SS / PBCH blocks, PDSCH, PDCCH, periodic signals, measurement signals, etc. In this embodiment, the uplink channel includes PUSCH, PUCCH, PRACH, etc., and the uplink signal includes SRS, periodic signals, measurement signals, etc.

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

[0364] In other respects, the method by which a terminal processes uplink transmissions includes the steps of determining whether at least one of the symbols instructed to transmit an uplink channel or an uplink signal overlaps with the symbols to which the SS / PBCH block instructed to be received from the base station is assigned, and transmitting the uplink channel or uplink signal based on the determination. Here, if at least some of the G symbols are configured to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or uplink signal; otherwise, it transmits the uplink signal.

[0365] Symbols for downlink transmission and uplink transmission In other respects, the method by which a terminal processes uplink transmissions includes the steps of determining whether at least one symbol among the symbols instructed to transmit an uplink channel or an uplink signal overlaps with a symbol (or symbol for downlink transmission) instructed to receive a downlink transmission from a base station, and transmitting an uplink channel or an uplink signal based on the determination. Here, if at least a portion of the symbols from which the uplink transmission is received overlaps with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal; otherwise, it transmits the uplink signal.

[0366] In another aspect, the method by which a terminal processes an uplink transmission includes the steps of determining whether at least one of the symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a G symbol(etc.) following a symbol(etc.) instructed to receive a downlink transmission from a base station, and transmitting the uplink channel or uplink signal based on the determination. Here, if at least some of the G symbols(etc.) are set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or uplink signal; otherwise, it transmits the uplink signal.

[0367] On the other hand, this embodiment includes a step in which the base station performs scheduling (dynamic scheduling of ig layer 1 (L1)) so that symbols for downlink transmission and symbols for uplink transmission do not overlap. In other words, when the base station performs scheduling for the terminal, it sets up the uplink transmission based on G symbols. In this case, the terminal does not expect the base station to set up its uplink transmission within the G symbols.

[0368] Furthermore, this embodiment includes the steps of determining whether the G symbol overlaps with the uplink transmission configured with RRC when an uplink transmission based on an RRC configuration that is not dynamically scheduled for L1 is set up by the terminal, and whether or not the terminal transmits an uplink channel or signal based on the determination.

[0369] The following discloses a method by which a terminal processes downlink reception and uplink channel (or uplink signal) transmission based on the DL-UL switching gap (G). In this embodiment, the downlink signal includes SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. Also in this embodiment, the uplink channel includes PUSCH, PUCCH, PRACH, etc., and the uplink signal includes SRS, etc.

[0370] Processing of the downlink signal depending on whether the flexible symbol and uplink signal can be superimposed. The terminal may or may not receive a downlink signal (ig downlink periodic signal) or measurement signal (ig downlink periodic signal) configured by a terminal-specific RRC message, which is either a symbol configured by a flexible symbol according to semi-static DL / UL assignment information or a symbol not configured by semi-static DL / UL assignment information. In this case, the method by which the terminal processes the configured downlink reception is based on the arrangement relationship (e.g., superposition relationship) between the DL-UL switching gap and the uplink signal.

[0371] In one aspect, the method by which a terminal processes the reception of the configured downlink includes the steps of determining whether the terminal is configured to transmit an uplink signal within G symbols (or symbols) after the last symbol of the configured downlink signal, and receiving the configured downlink signal based on the determination. Here, if the determination result shows that the configured downlink signal does not overlap with the uplink signal within G symbols (or symbols) after the last symbol of the configured downlink signal, the terminal receives the configured downlink signal. Conversely, if it overlaps with the uplink signal within G symbols (or symbols), the terminal does not receive the configured downlink signal. In other words, if there are not at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information and the first symbol assigned by the uplink signal within a single slot, the terminal drops the downlink signal.

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

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

[0374] Furthermore, the downlink signal includes CSI-RS configured with terminal-specific RRC messages. As an example, the downlink signal includes CORESET for PDCCH monitoring configured with terminal-specific RRC messages. As another example, the downlink signal includes downlink SPS PDSCH transmissions (excluding the first transmission) scrambled with CS-RNTI.

[0375] In other respects, the method by which the terminal processes the downlink reception includes the steps of determining whether the terminal overlaps with a UL symbol configured by semi-static DL / UL assignment information within the G symbols (and so forth) following the last symbol of the downlink signal, and receiving the downlink signal based on the determination. If, as a result of the determination, the terminal finds that the G symbols (and so forth) overlap with a UL symbol configured by semi-static DL / UL assignment information, the terminal does not receive the downlink signal; otherwise, it receives the downlink signal. In other words, the terminal drops the downlink signal unless there are at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information and the first symbol assigned by the uplink signal within a single slot.

[0376] In another aspect, the method by which the terminal processes the configured downlink reception includes the steps of determining whether the terminal overlaps with a UL symbol indicated by the dynamic SFI within the G symbols (etc.) following the last symbol of the configured downlink signal, and receiving the configured downlink signal based on the determination. If, as a result of the determination, the terminal finds that there is an overlap with a UL symbol indicated by the dynamic SFI within the G symbols (etc.), the terminal does not receive the configured downlink signal; otherwise, it receives the downlink signal. In other words, the terminal drops the downlink signal unless there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information within a slot and the first symbol assigned by the uplink signal.

[0377] In another aspect, the method by which a terminal processes the configured downlink reception includes the steps of determining whether the terminal overlaps with a UL symbol configured by semi-static DL / UL assignment information within the G symbols (etc.) preceding the first symbol of the uplink signal, and receiving the configured downlink signal based on the determination. If, as a result of the determination, the terminal overlaps with a DL symbol configured by semi-static DL / UL assignment information within the G symbols (etc.), the terminal does not receive the configured downlink signal; otherwise, it receives the configured downlink signal. In other words, the terminal drops the downlink signal unless there are at least G gap symbols between the last DL symbol configured by semi-static DL / UL assignment information within a slot and the first symbol assigned in the uplink signal.

[0378] In another aspect, the method by which the terminal processes the configured downlink reception includes the steps of determining whether the terminal overlaps with a DL symbol indicated by the dynamic SFI within the G symbols (etc.) prior to the first symbol of the uplink signal, and the terminal receiving the configured downlink signal based on the determination. If, as a result of the determination, the terminal overlaps with a DL symbol indicated by the dynamic SFI within the G symbols (etc.), the terminal does not receive the configured downlink signal; otherwise, it receives the configured downlink signal. In other words, the terminal drops the downlink signal unless there are at least G gap symbols between the last DL symbol configured by the semi-static DL / UL assignment information within a slot and the first symbol assigned by the uplink signal.

[0379] Here, the method by which a terminal processes uplink transmissions includes the operation in which, in symbols composed of flexible symbols by semi-static DL / UL assignment information or symbols not composed of semi-static DL / UL assignment information, the terminal does not expect the uplink signal to be composed of or indicated by the L1 signal among the G symbols following the downlink signal (downlink periodic signal or measurement signal) composed of terminal-specific RRC messages.

[0380] Processing of the uplink signal depending on whether the flexible symbol and downlink signal can be superimposed. The terminal may transmit or be unable to transmit an uplink signal (ig uplink periodic signal or measurement signal) configured by a terminal-specific RRC message, using symbols configured by flexible symbols according to semi-static DL / UL assignment information or symbols not configured by semi-static DL / UL assignment information. In this case, the method by which the terminal processes the configured uplink transmission is determined based on the arrangement relationship (e.g., superposition relationship) between the DL-UL switching gap and the uplink signal.

[0381] In one aspect, the method by which a terminal processes the configured uplink transmission includes the step of transmitting the configured uplink signal based on whether the terminal receives a downlink signal within G symbols("a") prior to the last symbol of the configured uplink signal. That is, if the configured uplink signal does not overlap with the downlink signal within G symbols("a") prior to the first symbol of the configured uplink signal, the terminal transmits the configured uplink signal. Conversely, if it overlaps with the downlink signal within G symbols("a"), the terminal does not transmit the configured uplink signal. That is, if there are no gap symbols between the first DL symbol configured by the semi-static DL / UL assignment information and the last symbol assigned by the downlink signal within a single slot, the terminal drops the uplink signal.

[0382] Here, the downlink signal includes a downlink signal composed of cell-specific RRC messages. For example, the downlink signal composed of cell-specific RRC messages includes an SS / PBCH block. Another example is the downlink signal composed of cell-specific RRC messages, which 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). Yet another example is the downlink signal composed of cell-specific RRC messages, which includes a type-0A common search space. Here, the type-0A common search space is a search space for receiving PRACH responses during random access.

[0383] Alternatively, the downlink signal includes the downlink signal indicated by L1 signaling. For example, the uplink signal indicated by L1 signaling includes a PDSCH scheduled in DCI format 1_0 or 1_1. Another example is the uplink signal indicated by L1 signaling includes a periodic CSI-RS indicated by DCI. Yet another example is the uplink signal indicated by L1 signaling includes the first transmission of an uplink SPS PDSCH transmission indicated by DCI that has been scrambled with CS-RNTI.

[0384] Furthermore, the uplink signal includes an SRS composed of terminal-specific RRC messages. For example, the uplink signal includes periodic PUCCH and PUSCH messages composed of terminal-specific RRC messages. Another example is an uplink signal composed of terminal-specific RRC messages and including an SR.

[0385] In other words, the method by which a terminal processes the configured uplink transmission includes the steps of determining whether there is an overlap with a UL symbol configured by semistatic DL / UL assignment information within the G symbols (or) preceding the first symbol of the configured uplink signal, and the steps of the terminal transmitting the configured uplink signal based on the determination. If, as a result of the determination, there is no overlap with a DL symbol configured by semistatic DL / UL assignment information within the G symbols (or), the terminal transmits the configured uplink signal; otherwise, it does not transmit the configured uplink signal. In other words, if there are no gap symbols between the first DL symbol configured by semistatic DL / UL assignment information and the last symbol assigned in the downlink signal within a single slot, the terminal drops the uplink signal.

[0386] Here, the way in which a terminal processes downlink reception includes an operation in which, in symbols composed of flexible symbols by semi-static DL / UL assignment information or symbols not composed of semi-static DL / UL assignment information, the terminal does not expect that a downlink signal (downlink periodic signal or measurement signal) composed of terminal-specific RRC messages will be composed of or indicated by L1 signaling among the G symbols following the downlink signal (downlink periodic signal or measurement signal).

[0387] In symbols composed of flexible symbols by semi-static DL / UL assignment information, or symbols not composed of semi-static DL / UL assignment information, if the number of symbols between the last symbol of a downlink signal composed of a cell-specific RRC message or indicated by L1 signaling and the first symbol of an uplink signal composed of a cell-specific RRC message or indicated by L1 signaling is less than G, the terminal behaves as follows:

[0388] For example, a terminal receives a downlink signal composed of cell-specific RRC messages, but does not transmit an uplink signal composed of cell-specific RRC messages or instructed by L1 signaling.

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

[0390] Another example is that a terminal operates via L1 signaling. That is, if L1 signaling instructs downlink reception and a cell-specific RRC message constitutes uplink transmission, the terminal will perform downlink reception and not uplink transmission. Conversely, if L1 signaling instructs uplink reception and a cell-specific RRC message constitutes downlink transmission, the terminal will perform uplink transmission and not downlink reception.

[0391] Figure 17 is a block diagram showing the configuration of a terminal and a base station according to one embodiment of the present invention. In one embodiment of the present invention, the terminal is embodied in 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. In the embodiment of the present invention, the base station controls and manages the cells (e.g., macrocells, femtocells, picocells, etc.) in 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 one embodiment of the present invention includes a processor 110, a communication unit 120, a memory 130, a user interface unit 140, and a display unit 150. The terminal 100 is a terminal 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 the terminal transmitting or receiving an object according to each embodiment of this specification, and the processor 110 performs other operations such as generating, judging, and deciding on objects.

[0393] First, the processor 110 executes various instructions or programs to process data inside the terminal 100. The processor 1100 also controls the overall operation of the terminal 100, including each unit, and controls the transmission and reception of data between units. Here, the processor 110 is configured to perform the operations described in the embodiment of the present invention. For example, the processor 110 receives slot configuration information, determines the slot configuration based on it, and communicates 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 connectivity using a wireless LAN. To this end, the communication module 120 incorporates multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either internally or externally. In the drawing, the communication module 120 is shown as an integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

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

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

[0397] The unlicensed band communication interface card 123 transmits and receives radio signals to and from at least one of the base station 200, an external device, or a server via the third frequency band, which is an unlicensed band, and provides communication services in the unlicensed band based on instructions from 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 the 2.4GHz or 5GHz band. At least one NIC module of the unlicensed band communication interface card 123 independently or dependently performs wireless communication with at least one of the base station 200, an external device, or a server, depending on the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0398] Next, the memory 130 stores control programs used by the terminal 100 and various data associated with them. Such control programs include predetermined programs necessary for the terminal 100 to communicate wirelessly with at least one of the following: a base station 200, an external device, or a server.

[0399] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. In other words, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. The user interface 140 also outputs based on instructions from the processor 110 using various output means.

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

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

[0402] First, the processor 210 executes various instructions or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200, including each unit, and controls the transmission and reception of data between units. Here, the processor 210 is configured to perform the operations described in the embodiments of this disclosure. For example, the processor 210 may signal slot configuration information and communicate 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. To this end, the communication module 120 incorporates multiple network interface cards, such as cellular communication interface cards 221 and 222, and an unlicensed band communication interface card 223, either internally or externally. In the drawing, the communication module 220 is shown as an integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing.

[0404] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, external devices, and servers described above via a mobile communication network, and provides cellular communication services in the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that utilizes a frequency band of 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 devices, and servers, depending on the cellular communication standard or protocol of the frequency band of less than 6 GHz supported by the NIC module.

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

[0406] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, or a server via the third frequency band, which is an unlicensed band, and provides communication services in the unlicensed band based on instructions 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 the 2.4GHz or 5GHz band. At least one NIC module of the unlicensed band communication interface card 223 independently or dependently performs wireless communication with at least one of the terminal 100, an external device, or a server, depending on the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0407] The terminal 100 and base station 200 shown in Figure 17 are block diagrams according to one embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-mentioned elements of the device are mounted on one or more chips depending on the device design. Furthermore, some components of the terminal 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as needed.

[0408] The above description of the present invention is illustrative, and a person with ordinary skill in the art to which the invention pertains should understand that it can be easily modified into other specific forms without altering the technical idea or essential features of the invention. Therefore, the above embodiments should be understood to be illustrative and limited in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0409] The scope of the present invention is indicated by the claims described below rather than by the detailed description above, and all modifications or altered forms derived from the meaning and scope of the claims and the concept of equivalents thereto should be interpreted as being included within the scope of the present invention. [Explanation of Symbols]

[0410] 110 processors 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 Interfaces 150 display units 210 processors 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 UE (user equipment) configured to operate in a wireless communication system, wherein the UE is Communication module and Processor and Equipped with, The aforementioned processor, Semi-static UL / DL (uplink-downlink) configuration information related to the slot configuration is received, thereby sequentially configuring downlink symbols, flexible symbols, and uplink symbols in the time domain. If the conditions are met, it is determined that the uplink resource is valid in the slot, and the conditions include i) the uplink resource overlaps with the flexible symbol, and ii) the uplink resource starts at least G symbols after the last downlink symbol and at least G symbols after the last symbol of the synchronization signal / physical broadcast channel (SS / PBCH) block, where G is a non-negative integer. If the aforementioned uplink resource is enabled in the slot, uplink transmission is performed using the aforementioned uplink resource in the slot. UE is configured in such a way.

2. The UE according to claim 1, wherein the symbols of the SS / PBCH block are determined based on the parameters of the RRC (radio resource control) signal.

3. The UE according to claim 1 or 2, wherein at least a portion of the SS / PBCH block is located within the flexible symbol.

4. The UE according to any one of claims 1 to 3, wherein the semi-static UL / DL configuration information includes UE-shared UL / DL configuration information.

5. The UE according to any one of claims 1 to 4, wherein the symbol set for the uplink resource is composed of RRC (radio resource control) signals.

6. The UE according to any one of claims 1 to 5, wherein G is configured as one of a plurality of non-negative integers including 2.

7. A method performed by a UE (user equipment) in a wireless communication system, wherein the method is A step of receiving semi-static UL / DL (uplink-downlink) configuration information related to the slot configuration, wherein downlink symbols, flexible symbols, and uplink symbols are sequentially configured in the time domain. Steps to determine if an uplink resource is valid in a slot if the following conditions are met: i) the uplink resource overlaps with the flexible symbol; and ii) the uplink resource begins at least G symbols after the last downlink symbol and at least G symbols after the last symbol of the synchronous signal / physical broadcast channel (SS / PBCH) block, where G is a non-negative integer. If the aforementioned uplink resource is valid in the slot, the step is to perform uplink transmission using the aforementioned uplink resource in the slot. Methods that include...

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

9. The method according to claim 7 or 8, wherein at least a portion of the SS / PBCH block is located within the flexible symbol.

10. The method according to any one of claims 7 to 9, wherein the semi-static UL / DL configuration information includes UE-shared UL / DL configuration information.

11. The method according to any one of claims 7 to 10, wherein the symbol set for the uplink resource is comprised of RRC (radio resource control) signals.

12. The method according to any one of claims 7 to 11, wherein G is configured as one of a plurality of non-negative integers including 2.

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