Method and apparatus for transmitting and receiving a shared channel in a wireless communication system

Abstract

To provide a method for transmitting and receiving an uplink shared channel.SOLUTION: A method for transmitting and receiving a shared channel in a wireless communication system is provided. The method implemented with a terminal comprises: a step for receiving, from a base station, first resource information for transmitting and receiving a shared channel; and a step for receiving, from the base station, the shared channel on a first resource determined on the basis of the first resource information or transmitting, to the base station, the shared channel on the first resource.SELECTED DRAWING: Figure 30

Description

[Technical Field]

[0001] The present specification relates to a wireless communication system, and to a method and apparatus for transmitting and receiving a shared channel. [Background technology]

[0002] After the commercialization of the fourth-generation (4G) communication system, efforts are underway to develop a new fifth-generation (5G) communication system to meet the increasing demand for wireless data traffic. 5G communication systems are also called post-4G network communication systems, post-LTE systems, or new radio (NR) systems. To achieve high data rates, 5G communication systems include systems that operate using millimeter wave (mmWave) bands above 6 GHz, and also include communication systems that operate using frequency bands below 6 GHz to ensure coverage. As a result, implementation forms for base stations and terminals are under consideration.

[0003] The 3rd Generation Partnership Project (3GPP®) NR system increases network spectral efficiency, enabling communication providers to offer more data and voice services over a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmissions in addition to supporting large amounts of voice. The advantages of the NR system are higher throughput and lower latency on the same platform, support for frequency division duplexing (FDD) and time division duplexing (TDD), and low operating costs with an enhanced end-user environment and simple architecture.

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

[0005] To mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, technologies being discussed for 5G communication systems include beamforming, massive multiple input / output (massive MIMO), full dimension multiple input / output (FD-MIMO), array antenna, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies. In addition, to improve the system network, technological developments are being carried out for the 5G communication system in areas such as 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, coordinated multi-points (CoMP), and interference cancellation.Other advanced coding modulation (ACM) methods being developed for 5G systems include hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[0006] Meanwhile, in a human-centered connected network where humans generate and consume information, the Internet is evolving into the Internet of Things (IoT) network, which exchanges information among distributed components such as objects. Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connections to cloud servers. Implementing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. As a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have been considered for connecting objects. In an IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects to create new value in human life. Through the integration and blending of existing information technology (IT) with various industries, IoT can be applied in areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, health management, 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 (M2M) communication, and machine-type communication (MTC) are implemented using techniques such as beamforming, MIMO, and array antennas. The application of Cloud RAN as a big data processing technology described above is an example of the fusion of 5G technology and IoT technology. Generally, mobile communication systems are being developed to provide voice services while guaranteeing user activity.

[0008] However, mobile communication systems have gradually expanded beyond voice services to include data services, and have now been developed to the extent that they provide high-speed data services. However, due to the resource shortage phenomenon in currently available mobile communication systems and users' demand for high-speed services, more advanced mobile communication systems are needed. Summary of the Invention [Problem to be solved by the invention]

[0009] The present specification aims to provide a method for transmitting and receiving an uplink shared channel. [Means for solving the problem]

[0010] The present specification provides a method for transmitting and receiving a shared channel in a wireless communication system.

[0011] Specifically, the method performed by the terminal includes: receiving first resource information for transmitting and receiving a shared channel from a base station, the first resource information including a relative starting symbol index and a symbol length in a time domain resource for transmitting and receiving the shared channel; and receiving the shared channel from the base station on a first resource determined based on the first resource information, or transmitting the shared channel to the base station on the first resource, wherein a starting symbol index of the first resource is determined based on the relative starting symbol index and a previously defined reference symbol index.

[0012] In this specification, the reference symbol index is characterized by being 0.

[0013] In this specification, the reference symbol index is determined based on a start symbol and a length of a resource including the first resource information.

[0014] Also, in this specification, the first resource is characterized in that it is determined based on a first subcarrier spacing (SCS) of a first cell including the first resource information and a second SCS of a second cell including the shared channel.

[0015] In addition, in this specification, when the first SCS and the second SCS are the same, the reference symbol index is an index of the leading symbol among symbols including the first resource information of the first cell.

[0016] Furthermore, in this specification, when the first SCS is smaller than the second SCS, the reference symbol index is an index of the first symbol among symbols including the shared channel of the second cell that overlap in the time domain with a symbol including the first resource information of the first cell.

[0017] Also, in this specification, when the first SCS is smaller than the second SCS, the reference symbol index is an index of the last symbol among symbols including the shared channel of the second cell that overlap in the time domain with a symbol including the first resource information of the first cell.

[0018] Furthermore, in this specification, when the first SCS is greater than the second SCS, the reference symbol index is the index of the first symbol among the symbols including the shared channel of the second cell that overlap in the time domain with the symbols of the first cell and that are not first to the symbol including the first resource information.

[0019] In this specification, the first resource information further includes a first position of a Demodulation-Reference Signal (DM-RS) mapped to the first resource.

[0020] Also, in this specification, when the first resource includes the first position, the DM-RS is mapped to the first position, and when the first resource does not include the first position, the DM-RS is mapped to a symbol indicated by the starting symbol index of the first resource.

[0021] Also, in this specification, when the shared channel is transmitted first on the first resource and repeatedly transmitted second on the second resource, the DM-RS is mapped to the first position on the first resource, and the DM-RS is mapped to the first symbol of the second resource.

[0022] Also, in this specification, when the shared channel is transmitted first on the first resource and then repeatedly transmitted second on the second resource, the DM-RS is mapped to the first position on the first resource, and the DM-RS is mapped to a position corresponding to the first position on the second resource, and the corresponding position is a position that is separated from the first symbol of the second period by the distance that the first symbol of the first resource is separated from the first position.

[0023] Also, in this specification, the DM-RS is characterized in that it is mapped to a symbol indicated by the starting symbol index of the first resource regardless of the first position.

[0024] In this specification, the method may further include receiving second resource information for transmitting and receiving the shared channel from the base station, the second resource information including information regarding usage of a plurality of symbols constituting a slot of the first resource, and the reference symbol index is determined based on the first resource information and the second resource information.

[0025] In addition, in this specification, when the base station transmits the shared channel on the first resource, the reference symbol index is an index of a symbol immediately after the last symbol whose purpose is set to downlink among the plurality of symbols and whose direction is set to flexible.

[0026] In addition, in this specification, when the base station transmits the shared channel on the first resource, the reference symbol index is an index of a symbol whose use is set to flexible or uplink immediately after a gap symbol located after the last symbol whose use is set to downlink among the plurality of symbols.

[0027] Also, in this specification, there is provided a terminal for transmitting and receiving a shared channel in a wireless communication system, the terminal including a transceiver, a processor,

[0028] and a memory coupled to the processor for storing instructions for operations executed by the processor, the operations including: receiving first resource information for transmitting a shared channel from a base station, the first resource information including a relative starting symbol index and a symbol length in a time domain resource for transmitting the shared channel; and receiving the shared channel from the base station on a first resource determined based on the first resource information, or transmitting the shared channel to the base station on the first resource, the first resource determined based on the first resource information, wherein a starting symbol index of the first resource is determined based on the relative starting symbol index and a previously defined reference symbol index.

[0029] In this specification, the reference symbol index is characterized by being 0.

[0030] In this specification, the reference symbol index is determined based on a resource including the first resource information.

[0031] Also, in this specification, the first resource is characterized in that it is determined based on a first subcarrier spacing (SCS) of a first cell including the first resource information and a second SCS of a second subcarrier of a second cell including the shared channel. [Effects of the Invention]

[0032] This specification provides a method for efficiently determining resources to be used for shared channel transmissions. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system.

[0034] [Figure 2] FIG. 1 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.

[0035] [Figure 3] 1 is a diagram illustrating physical channels used in a 3GPP system and a typical signal transmission method using the physical channels.

[0036] [Figure 4a] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4b] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system.

[0037] [Figure 5a] FIG. 1 illustrates a procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 5b] FIG. 1 illustrates a procedure for transmitting control information and control channels in a 3GPP NR system.

[0038] [Figure 6] FIG. 1 illustrates a control resource set (CORESET) in which a physical downlink control channel (PDCCH) may be transmitted in a 3GPP NR system.

[0039] [Figure 7] FIG. 1 illustrates a method for configuring a PDCCH search space in a 3GPP NR system.

[0040] [Figure 8] FIG. 1 is a conceptual diagram illustrating carrier aggregation.

[0041] [Figure 9] FIG. 1 is a diagram for explaining single-carrier communication and multi-carrier communication.

[0042] [Figure 10] A diagram showing an example in which a cross-carrier scheduling technique is applied.

[0043] [Figure 11] 2A and 2B are block diagrams showing the configurations of a terminal and a base station according to an embodiment of the present invention.

[0044] [Figure 12] FIG. 2 is a diagram showing a slot structure of a TDD-based mobile communication system according to an embodiment of the present invention.

[0045] [Figure 13] FIG. 1 is a diagram illustrating a PUCCH (Physical Uplink Control Channel) used in a wireless communication system according to an embodiment of the present invention.

[0046] [Figure 14] FIG. 10 is a diagram illustrating a method for transmitting PUCCH in slots.

[0047] [Figure 15a] FIG. 10 is a diagram illustrating an example in which a PUCCH is transmitted in another slot due to a change in slot configuration. [Figure 15b] FIG. 10 is a diagram illustrating an example in which a PUCCH is transmitted in another slot due to a change in slot configuration.

[0048] [Figure 16] FIG. 10 is a diagram showing slots in which a repetitive PUCCH is transmitted according to a slot configuration.

[0049] [Figure 17] FIG. 10 is a diagram showing whether or not PUCCH transmission occurs depending on the slot configuration.

[0050] [Figure 18] 1 illustrates mini-slot-level PUSCH repetition transmission according to an embodiment of the present invention.

[0051] [Figure 19(a)] 10 illustrates a mini-slot-level PUSCH repetition transmission according to yet another embodiment of the present invention. [Figure 19(b)] 10 illustrates a mini-slot-level PUSCH repetition transmission according to yet another embodiment of the present invention.

[0052] [Figure 20] FIG. 10 illustrates a condition for mini-slot-level PUSCH repetitive transmission to end according to an embodiment of the present invention.

[0053] [Figure 21] FIG. 10 is a diagram illustrating a counting rule for mini-slot-level PUSCH repetition transmission according to an embodiment of the present invention.

[0054] [Figure 22] FIG. 10 is a diagram illustrating PUSCH transmission taking into account slot boundaries according to an embodiment of the present invention.

[0055] [Figure 23] 10 is a diagram illustrating PUSCH repetition transmission considering mini-slot-level PUSCH repetition transmission and multi-segment transmission according to an embodiment of the present invention. [Figure 24] 10 is a diagram illustrating PUSCH repetition transmission considering mini-slot-level PUSCH repetition transmission and multi-segment transmission according to an embodiment of the present invention. [Figure 25] 10 is a diagram illustrating PUSCH repetition transmission considering mini-slot-level PUSCH repetition transmission and multi-segment transmission according to an embodiment of the present invention. [Figure 26] 10 is a diagram illustrating PUSCH repetition transmission considering mini-slot-level PUSCH repetition transmission and multi-segment transmission according to an embodiment of the present invention.

[0056] [Figure 27] FIG. 10 is a diagram illustrating repeated PUSCH transmission according to an embodiment of the present invention.

[0057] [Figure 28] 10 is a diagram illustrating a method for positioning DM-RS in PUSCH repeated transmission according to an embodiment of the present invention.

[0058] [Figure 29] 10 is a diagram illustrating a method for determining a reference symbol index of a PDSCH according to an embodiment of the present invention.

[0059] [Figure 30] 10 is a flowchart illustrating an operation process in a terminal performing a method for transmitting a shared channel according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0060] The terms used in this specification are currently widely used and general terms that are possible based on the functions of the present invention. However, the terms may be changed according to the intentions, practices, and the emergence of new technologies of those skilled in the art. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, their meanings will be explained in the corresponding description of the present specification. Therefore, it is intended to be clear that the terms used in this specification should be analyzed based not only on the names of the terms but also on the substantial meaning of the terms and content throughout this specification.

[0061] Throughout this specification and the claims that follow, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or may be "electrically connected" to the other element through a third element. Furthermore, unless expressly stated to the contrary, the word "comprising" is understood to imply the inclusion of the stated elements and not the exclusion of any other elements unless otherwise specified. Moreover, limitations such as "equivalent to" or "equivalent to" based on a particular threshold value may be appropriately substituted with "greater than" or "less than," respectively, in some exemplary embodiments.

[0062] The following technologies may be used in various wireless access systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single-Carrier FDMA (SC-FDMA). CDMA may be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented by wireless technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (EUMTS) that uses Evolved UMTS Terrestrial Radio Access (E-UTRA), and LTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A to support enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) services, which are requirements of IMT-2020. For clarity, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0063] Unless otherwise specified herein, a base station may refer to a next-generation Node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise specified, a terminal may refer to a user equipment (UE). Hereinafter, for ease of understanding, each content will be described separately as an embodiment, but the embodiments may be used in combination with each other. In this disclosure, a configuration of a terminal may refer to a configuration by a base station. Specifically, a base station may transmit a channel or a signal to a terminal and configure parameter values ​​used in the operation of the terminal or the wireless communication system.

[0064] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system.

[0065] Referring to FIG. 1, a wireless frame (or radio frame) used in a 3GPP NR system has a length of 10 ms (Δf max N f / 100)*T c ) In addition, a wireless frame includes 10 subframes (SF) of equal size. max =480*10 3 Hz, N f =4096, T c =1 / (Δf ref *N f,ref ), Δf ref =15*10 3 Hz and N f,ref = 2048. The 10 subframes in one wireless frame may be assigned numbers from 0 to 9. Each subframe has a length of 1 ms and may include one or more slots according to the subcarrier spacing. More specifically, in a 3GPP NR system, the subcarrier spacing that may be used is 15*2 μkHz, and μ can have values ​​of μ=0, 1, 2, 3, 4 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz can be used for the subcarrier spacing. One subframe with a length of 1 ms is 2 μ slots, each of which may be 2 -μ ms. 2 in one subframe μ slots, each with 0 to 2 μ In addition, slots in one wireless frame may be assigned numbers from 0 to 10*2. μ The allocated numbers may range from -1 to -1. The time resources may be distinguished by at least one of a wireless frame number (also referred to as a wireless frame index), a subframe number (also referred to as a subframe index), and a slot number (or slot index).

[0066] 2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 illustrates a resource grid structure for a 3GPP NR system.

[0067] Specifically, Figure 2 shows the structure of a resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot includes multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and multiple Resource Blocks (RBs) in the frequency domain. An OFDM symbol also refers to one symbol section. Unless otherwise specified, an OFDM symbol may simply be referred to as a symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, the signal transmitted from each slot is divided into N size,μ grid,x *N RB sc Book subcarrier and N slot symbmay be represented by a resource grid containing N OFDM symbols, where x=DL if the signal is a DL signal and x=UL if the signal is a UL signal. size,μ grid,x represents the number of resource blocks (RBs) according to the subcarrier spacing, which is a component of μ (x is DL or UL), and N slot symb represents the number of OFDM symbols in a slot. RB sc is the number of subcarriers that make up one RB, and N RB sc = 12. Depending on the multiple access scheme, OFDM symbols may be called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols.

[0068] The number of OFDM symbols included in one slot may vary according to the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 14 OFDM symbols, while in the case of an extended CP, one slot may include 12 OFDM symbols. In a particular embodiment, the extended CP may be used only with 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure may be similarly applied to slots having a different number of OFDM symbols. Referring to FIG. 2, each OFDM symbol is N size,μ grid,x *N RB sc The carrier frequency includes four subcarriers. The subcarrier types can be divided into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0069] One RB is N RB sc A resource may be defined by (e.g., 12) consecutive subcarriers. For reference, a resource configured using one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or tone. Thus, one RB may be defined by N slot symb *N RB sc Each resource element in the resource grid can be uniquely defined within a slot by a pair of indices (k, l), where k ranges from 0 to N in the frequency domain. size,μ grid,x *N RB sc l may be an index ranging from 0 to N in the time domain. slot symb It may be an index that scales down to -1.

[0070] In order for a UE to receive signals from or transmit signals to a base station, the time / frequency of the UE may be synchronized to the time / frequency of the base station, since when the base station and the UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate DL signals and transmit UL signals at the appropriate times.

[0071] Each symbol of a radio frame used in time division duplex (TDD), i.e., unpaired spectrum, may be configured with at least one of DL symbols, UL symbols, and flexible symbols. In frequency division duplex (FDD), i.e., paired spectrum, a radio frame used as a DL carrier may be configured with DL symbols or flexible symbols, and a radio frame used as a UL carrier may be configured with UL symbols or flexible symbols. DL symbols allow DL transmission but not UL transmission. UL symbols allow UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL according to the signal.

[0072] Information about each symbol type, i.e., information indicating any one of DL symbols, UL symbols, and flexible symbols, can be configured using cell-specific or common radio resource control (RRC) signals. In addition, information about each symbol type can be additionally configured using UE-specific or dedicated RRC signals. The base station notifies i) the duration of the cell-specific slot configuration, ii) the number of slots with only DL symbols from the beginning of the cell-specific slot configuration period, iii) the number of DL symbols from the first symbol of the slot immediately following the slot with only DL symbols, iv) the number of slots with only UL symbols from the end of the cell-specific slot configuration period, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot with only UL symbols by using cell-specific RRC signals. Here, a symbol that is not configured using either UL symbols or DL ​​symbols is a flexible symbol.

[0073] When information about symbol types is configured using UE-specific RRC signals, the base station may signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal signals the number of DL symbols among the N symbols of the corresponding slot for each slot, and the number of UL symbols among the N symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, a symbol that is not configured using either a UL symbol or a DL symbol is a flexible symbol. slot symb number of DL symbols among the N symbols of the corresponding slot for each slot, and the N slot symb number of UL symbols among the N symbols of the corresponding slot may be signaled. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, a symbol that is not configured using either a UL symbol or a DL symbol is a flexible symbol.

[0074] FIG. 3 is a diagram for explaining physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0075] When the power of the UE is turned on or the UE camps on a new cell, the UE performs initial cell search (S101). Specifically, the UE may synchronize to the BS during initial cell search. For this purpose, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize to the base station and obtain information such as the cell ID. Thereafter, the UE can receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0076] Upon completion of the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information in the PDCCH, so that the UE can acquire system information that is more specific than the system information acquired through the initial cell search (S102). Here, the system information acquired by the UE is cell-common system information for the UE to operate correctly at the physical layer in Radio Resource Control (RRC), and is also referred to as remaining system information or system information block (SIB) 1.

[0077] When a UE first accesses a base station or does not have radio resources for signal transmission, the UE may perform a random access procedure with the base station (operations S103 to S106). First, the UE may transmit a preamble over a physical random access channel (PRACH) (S103) and receive a response message for the preamble from the base station over a PDCCH and a corresponding PDSCH (S104). If the UE receives a valid random access response message, the UE transmits data including the UE's identifier and the like to the base station over a physical uplink shared channel (PUSCH) indicated by a UL grant transmitted from the base station over the PDCCH (S105). Next, the UE waits for reception of a PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH via the UE's identifier (S106), the random access process is terminated. During the random access process, the UE may acquire UE-specific system information required for the UE to operate correctly at the physical layer in the RRC layer. Once the UE acquires UE-specific system information at the RRC layer, the UE enters the RRC connected mode (RRC_CONNECTED mode).

[0078] The RRC layer is used to generate and manage messages for control between a terminal and a wireless access network (RAN). More specifically, the base station and terminal can perform storage management including broadcasting cell system information required for all terminals in the cell, transmission management of paging messages, mobility management and handover, terminal measurement reporting and control thereof, terminal capability management, and device management at the RRC layer. Generally, the update of signals transmitted at the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission / reception period (i.e., transmission time interval, TTI) at the physical layer, so that RRC signals can be maintained unchanged for a long period.

[0079] After the above-described procedure, the UE receives the PDCCH / PDSCH (S107) and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. The format of the DCI may vary depending on the intended use. The uplink control information (UCI) transmitted by the UE to the base station through the UL includes a DL / UL ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI may be included in channel state information (CSI). In a 3GPP NR system, a UE may transmit control information, such as the HARQ-ACK and CSI described above, over the PUSCH and / or PUCCH.

[0080] FIG. 4 shows the SS / PBCH block for initial cell access in a 3GPP NR system.

[0081] When a UE is powered on or wants to access a new cell, it may acquire time and frequency synchronization with the cell and perform an initial cell search procedure. The UE may detect the physical cell identity (NcellID) of the cell during the cell search procedure. To this end, the UE may receive synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from a base station and synchronize to the base station. In this case, the UE may obtain information such as a cell identity (ID).

[0082] Referring to FIG. 4a, the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into a PSS and an SSS. The PSS can be used to obtain time-domain and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and a cell group ID. Referring to FIG. 4a and Table 1, an SS / PBCH block can be configured using 20 consecutive RBs (=240 subcarriers) in the frequency domain and 4 consecutive OFDM symbols in the time domain. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals through the remaining subcarriers, i.e., subcarriers 0 to 55 and 183 to 239. In addition, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals through subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block excluding the above signals.

[0083] [Table 1]

[0084] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group specifically including three unique identifiers through the combination of three PSSs and SSSs such that each physical layer cell ID is only part of one physical layer cell identifier group. Thus, the physical layer cell IDs N cell ID =3N (1) ID +N (2) ID is an index N ranging from 0 to 335 indicating a physical layer cell identifier group (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier within the physical layer cell identifier group. (2) ID The UE may detect the PSS and identify one of three unique physical layer identifiers. In addition, the UE may detect the SSS and identify one of 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS PSS (n) is as follows:

[0085]

number

[0086] where:

number

[0087]

number

[0088] Furthermore, the SSS series d SSS (n) is as follows:

[0089]

number

[0090] where:

number

[0091]

number

[0092] A radio frame of length 10 ms may be divided into two half-frames of length 5 ms.

[0093] Referring to Figure 4b, the slots in which the SS / PBCH blocks are transmitted within each half-frame will be described. The slots in which the SS / PBCH blocks are transmitted may be any one of Cases A, B, C, D, and E. In Case A, the subcarrier spacing is 15 kHz, and the start of the SS / PBCH block is the ({2, 8} + 14*n)th symbol. In this case, n = 0 or 1 for carrier frequencies below 3 GHz. Additionally, n = 0, 1, 2, or 3 may be used for carrier frequencies above 3 GHz and below 6 GHz. In Case B, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is {4, 8, 16, 20} + 28*n. In this case, n = 0 for carrier frequencies below 3 GHz. Additionally, n = 0 or 1 may be used for carrier frequencies above 3 GHz and below 6 GHz. In Case C, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is the ({2, 8} + 14*n)th symbol. In this case, n = 0 or 1 for carrier frequencies below 3 GHz. Additionally, n = 0, 1, 2, or 3 may be used for carrier frequencies above 3 GHz and below 6 GHz. In Case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is the ({4, 8, 16, 20} + 28*n) symbol. In this case, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 18 symbol for carrier frequencies above 6 GHz. In Case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is the ({8, 12, 16, 20, 32, 36, 40, 44} + 56*n) symbol. In this case, n = 0, 1, 2, 3, 5, 6, 7, or 8 symbol for carrier frequencies above 6 GHz.

[0094] Figure 5 shows a procedure for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, a base station may add a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs may include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). In addition, the UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. The base station may then perform channel coding (e.g., polar coding) (S204) and then perform rate matching according to the amount of resources used for PDCCH transmission (S206). The base station may then multiplex DCI based on a control channel element (CCE)-based PDCCH structure (S208). Additionally, the base station may apply additional processes, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI (S210), and then map the DCI to resources to be transmitted. A CCE is a basic resource unit for the PDCCH, and one CCE may include multiple (e.g., 6) resource element groups (REGs). One REG may be configured with multiple (e.g., 12) REs. The number of CCEs used for one PDCCH may be defined as an aggregation level.In a 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 may be used. Figure 5b is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control area accordingly.

[0095] FIG. 6 illustrates a control resource set (core set) in which a physical downlink control channel (PDCCH) may be transmitted in a 3GPP NR system.

[0096] A core set is a time-frequency resource within which the PDCCH, i.e., a control signal for the UE, is transmitted. In addition, a search space, which will be described later, may be mapped to a core set. Thus, rather than monitoring all frequency bands for PDCCH reception, the UE may monitor a time-frequency region designated as a core set and decode the PDCCH mapped to the core set. A base station may configure one or more core sets for a UE per cell. A core set may be configured using up to three consecutive symbols on the time axis. Additionally, a core set may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 6, core set #1 is configured using consecutive PRBs, and core sets #2 and #3 are configured using non-consecutive PRBs. A core set may be positioned within any symbol within a slot. For example, in the embodiment of FIG. 6, core set #1 starts in the first symbol of the slot, core set #2 starts in the fifth symbol of the slot, and core set #9 starts in the ninth symbol of the slot.

[0097] FIG. 7 illustrates a method for configuring a PUCCH search space in a 3GPP NR system.

[0098] To transmit a PDCCH to a UE, each core set may have at least one search space. In an embodiment of the present disclosure, a search space is a set of all time-frequency resources (hereinafter referred to as PDCCH candidates) through which the UE's PDCCH can be transmitted. The search space may include a common search space that 3GPP NR UEs are required to search in common, and a terminal-specific or UE-specific search space that a specific UE is required to search. In the common search space, a UE may monitor a PDCCH that all UEs in a cell belonging to the same base station are configured to search in common. In addition, a UE-specific search space may be configured for each UE so that the UE monitors the PDCCH allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, the search spaces between UEs may be partially overlapped due to the limited control areas in which the PDCCHs are allocated. Monitoring the PDCCH includes blind decoding to find PDCCH candidates within the search space. When blind decoding is successful, it may be expressed that the PDCCH is (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH is not detected / received or is not successfully detected / received.

[0099] For ease of description, a PDCCH scrambled with a group common (GC) RNTI previously known to one or more UEs to transmit DL control information to one or more UEs is referred to as a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a terminal-specific RNTI already known by a specific UE to transmit UL or DL ​​scheduling information to that UE is referred to as a UE-specific PDCCH. A common PDCCH may be included in a common search space, and a UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0100] A base station may signal information related to resource allocation of the transmission channels paging channel (PCH) and downlink shared channel (DL-SCH) (i.e., DL grants) or information related to resource allocation of the uplink shared channel (UL-SCH) and hybrid automatic repeat request (HARQ) (i.e., UL grants) to each UE or a group of UEs via the PDCCH. The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data excluding specific control information or specific service data via the PDSCH. In addition, a UE may receive data excluding specific control information or specific service data via the PDSCH.

[0101] A base station may transmit a PDCCH to a UE (one or more UEs) including information about where PDSCH data is to be transmitted and how the PDSCH data will be received and decoded by the corresponding UE. For example, assume that the DCI transmitted on a specific PDCCH is CRC masked using an RNTI of "A," and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., a frequency location) of "B," and indicates transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) of "C." The UE monitors the PDCCH using the RNTI information that the UE has. In this case, if a UE performs blind decoding of the PDCCH using the RNTI of "A," the UE receives the PDCCH and, through the received PDCCH information, receives the PDSCH indicated by "B" and "C."

[0102] Table 2 illustrates one embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0103] [Table 2]

[0104] The PUCCH may be used to transmit the following UL control information (UCI):

[0105] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0106] - HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on the PDSCH. The HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include a positive ACK (simply ACK), a negative ACK (hereinafter NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, an ACK may be represented by a bit value of 1, and a NACK may be represented by a bit value of 0.

[0107] - Channel State Information (CSI): Feedback information on the DL channel. The UE generates it based on the CSI reference signal (RS) transmitted by the base station. Multiple-input multiple-output (MIMO)-related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI may be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0108] In a 3GPP NR system, five PUCCH formats may be used to support different service scenarios, different channel environments, and frame structures.

[0109] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted over one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence on the two symbols may be transmitted over different RBs. In this case, the sequence may be a cyclic shift (CS) sequence of a base sequence used for PUCCH format 0. This allows the UE to obtain frequency diversity gain. Specifically, the terminal bit Bit UCI(M bit =1 or 2) to determine the cyclic shift (CS) value m cs Also, the length 12 basic sequence can be determined by the given CS value m cs Based on this, the cyclically shifted sequence can be mapped to 12 REs of one OFDM symbol and one RB and transmitted. bit = 1, one bit UCI 0 and 1 can be mapped to two cyclic shifted sequences, respectively, with a difference in cyclic shift value of 6. bit = 2, the 2-bit UCI 00, 01, 11, 10 can be mapped to four cyclic shifted sequences with a cyclic shift value difference of 3, respectively.

[0110] PUCCH format 1 carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted using consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, bit The UCI with M = 1 is modulated by BPSK. bitThe UCI, where d(0) = 2, is modulated using quadrature phase shift keying (QPSK). The modulated complex-valued symbol d(0) is multiplied by a sequence of length 12 to obtain a signal. The terminal spreads the obtained signal using a time-domain orthogonal cover code (OCC) on even-numbered OFDM symbols assigned to PUCCH format 1 and transmits it. In PUCCH format 1, the maximum number of different terminals that can be multiplexed in the same RB is determined according to the length of the OCC used. In odd-numbered OFDM symbols of PUCCH format 1, a demodulation reference signal (DMRS) is spread using OCC and mapped.

[0111] PUCCH format 2 can deliver UCI exceeding two bits. PUCCH format 2 can be transmitted over one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, the sequences transmitted in different RBs over the two OFDM symbols may be identical to each other. Here, the sequence is a sequence of modulated complex-valued symbols d(0),...,d(M symbol -1), where M symbol is M bit / 2. Through this, the UE may obtain frequency diversity gain. More specifically, M bit Bit UCI(M bit >2) is bit-level scrambled, QPSK modulated, and mapped to RBs of one or two OFDM symbols, where the number of RBs may be one of 1 to 16.

[0112] PUCCH format 3 or PUCCH format 4 may deliver UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 may be transmitted over consecutive 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 may be one of 4 to 14. Specifically, the UE may transmit M-ary PUCCH using π / 2-2 phase shift keying (BPSK) or QPSK. bit The complex-valued symbols d(0) to d(M symb -1) where, when π / 2-BPSK is used, M symb =M bit and when using QPSK, M symb =M bit / 2. The UE does not need to apply block-wise spreading to PUCCH format 3. However, the UE may apply block-wise spreading to one RB (i.e., 12 subcarriers) using PreDFT-OCC of length 12, such that PUCCH format 4 may have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on ​​the spread signal, maps it to each RE, and transmits the spread signal.

[0113] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of the UCI transmitted by the UE. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together over the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some of the UCI information according to the priority of the UCI information.

[0114] PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 may be configured through RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped may be configured using RRC signaling. When PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 is transmitted over N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceil(N / 2) OFDM symbols.

[0115] PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 may be configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted may be configured by RRC signaling. The repeatedly transmitted PUCCH must start at a fixed OFDM symbol in each slot and must have a constant length. When one of the OFDM symbols of a slot in which the UE should transmit the PUCCH is indicated as a DL symbol by RRC signaling, the UE may not transmit the PUCCH in the corresponding slot and may delay transmission of the PUCCH until the next slot for transmitting the PUCCH.

[0116] Meanwhile, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal may be configured with a bandwidth part (BWP) consisting of a contiguous portion of the carrier's bandwidth. A terminal operating according to TDD or using an unpaired spectrum may be configured with up to four DL / UL BWP pairs per carrier (or cell). The terminal can also activate one DL / UL BWP pair. A terminal operating according to FDD or using a paired spectrum may be configured with up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per uplink carrier (or cell). The terminal can activate one DL BWP and one UL BWP per carrier (or cell). The terminal does not need to receive or transmit on time-frequency resources other than the activated BWPs. An activated BWP can be referred to as an active BWP.

[0117] A base station can indicate to a terminal which BWPs among configured BWPs are activated using downlink control information (DCI). The BWP indicated in the DCI is activated, and other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station can include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI scheduling a PDSCH or a PUSCH to change the DL / UL BWP pair of the terminal. The terminal can receive the DCI scheduling a PDSCH or a PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH to change the DL BWP of the terminal. In an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH to change the UL BWP of the terminal.

[0118] FIG. 8 is a conceptual diagram illustrating carrier aggregation.

[0119] Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells (in a logical sense) configured using UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band so that a wireless communication system can use a wider frequency band. One component carrier may also be referred to as a primary cell (PCell) or a secondary cell (SCell), or a primary SCell (PScell). However, for convenience of explanation, the term "component carrier" will be used hereinafter.

[0120] Referring to Figure 8, as an example of a 3GPP NR system, the overall system band may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically contiguous subcarriers. Although Figure 8 shows each of the component carriers having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Also, although the component carriers are shown as being adjacent to each other on the frequency axis, the drawing is shown in a logical concept, and the component carriers may be physically adjacent to each other or spaced apart.

[0121] A different center frequency may be used for each component carrier. Also, one common center frequency may be used for physically adjacent component carriers. In the embodiment of Figure 8, assuming that all component carriers are physically adjacent, center frequency A may be used for all component carriers. Furthermore, assuming that the respective component carriers are not physically adjacent to each other, center frequency A and center frequency B may be used for each of the component carriers.

[0122] When the entire system bandwidth is expanded by carrier aggregation, the frequency band used for communication with each UE may be specified in units of component carriers. UE A may use 100 MHz of the entire system bandwidth and perform communication using all five component carriers. UE B 1~ UE B5 can only use a 20 MHz bandwidth and can perform communication using one component carrier. UEs C1 and C2 can use a 40 MHz bandwidth and each perform communication using two component carriers. The example of Figure 8 shows a case where UE C1 uses two non-adjacent component carriers and UE C2 uses two adjacent component carriers.

[0123] 9A and 9B are diagrams for explaining single-carrier communication and multi-carrier communication. Specifically, FIG. 9A shows a single-carrier subframe structure, and FIG. 9B shows a multi-carrier subframe structure.

[0124] Referring to FIG. 9(a), in FDD mode, a typical wireless communication system may transmit or receive data through one DL band and one UL band corresponding thereto. In another specific embodiment, in TDD mode, the wireless communication system may divide a radio frame into UL time units and DL time units in the time domain and transmit or receive data through the UL / DL time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) may be aggregated into UL and DL so that a 60 MHz bandwidth can be supported. The CCs may or may not be adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case where the bandwidth of the UL CC and the bandwidth of the DL CC are identical and symmetrical, the bandwidth of each CC may be determined independently. In addition, asymmetric carrier aggregation, in which the number of UL CCs and DL CCs differs, is possible. The DL / UL CC allocated / configured to a specific UE through RRC may be referred to as the serving DL / UL CC of the specific UE.

[0125] A base station may communicate with a UE by activating some or all of the UE's serving CCs or deactivating some CCs. The base station can change the CCs to be activated / deactivated and the number of CCs to be activated / deactivated. When a base station allocates CCs available to a UE as cell-specific or UE-specific, at least one of the allocated CCs may be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. A CC that is not deactivated by the UE is called a Primary CC (PCC) or a Primary Cell (PCell), and a CC that the base station can activate / deactivate freely is called a Secondary CC (SCC) or a Secondary Cell (SCell).

[0126] On the other hand, 3GPP NR uses the concept that a cell manages radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CC and UL CC. A cell can be configured with only DL resources or a combination of DL resources and UL resources. When carrier aggregation is supported, the association between the carrier frequency of DL resources (i.e., DL CC) and the carrier frequency of UL resources (i.e., UL CC) may be 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 an SCell. A carrier corresponding to a PCell in the DL is a DL PCC, and a carrier corresponding to a PCell in the UL is a UL PCC. Similarly, a carrier corresponding to an SCell in the DL is a DL SCC, and a carrier corresponding to an SCell in the UL is a UL SCC. According to UE capabilities, a serving cell can be configured with one PCell and zero or more SCells. For a UE that is in RRC_CONNECTED state but is not configured for or does not support carrier aggregation, there is only one serving cell configured with only a PCell.

[0127] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" which refers to several geographical areas for which communication services are provided by one base station or one antenna group. That is, one component carrier may also be referred to as a scheduling cell, scheduled cell, primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, to distinguish between cells which refer to several geographical areas and cells of carrier aggregation, in this disclosure, cells of carrier aggregation are referred to as CCs, and cells of geographical areas are referred to as cells.

[0128] 10 illustrates an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, a control channel transmitted over a first CC may schedule a data channel transmitted over the first CC or a second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted in the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists in the PDCCH area of ​​the scheduling cell. A PCell may essentially be the scheduling cell, and a specific SCell may be designated as the scheduling cell by higher layers.

[0129] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured as a PDCCH monitoring CC. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC can transmit only a PDCCH for scheduling its PDSCH without using a CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., a DL PCC) may transmit not only a PDCCH for scheduling a PDSCH of DL CC A using the CIF, but also a PDCCH for scheduling a PDSCH of another CC (cross-carrier scheduling). On the other hand, the PDCCH is not transmitted in another DL CC. Thus, the UE monitors either the PDCCH without a CIF to receive a self-carrier scheduled PDSCH or the PDCCH with a CIF to receive a cross-carrier scheduled PDSCH, depending on whether cross-carrier scheduling is configured for the UE.

[0130] 9 and 10 show the subframe structure of a 3GPP LTE-A system, and the same or similar configurations may be applied to a 3GPP NR system, except that in a 3GPP NR system, the subframes in FIGS. 9 and 10 may be replaced with slots.

[0131] FIG. 11 is a block diagram illustrating the configuration of a terminal and a base station according to an embodiment of the present disclosure. In the embodiment of the present disclosure, the terminal may be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal may also be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), etc. In addition, in the embodiment of the present disclosure, the base station may control and manage cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area and may have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may also be referred to as a next generation Node B (gNB) or an access point (AP), etc.

[0132] As shown, a terminal 100 according to one embodiment of the present disclosure may include a processor 110 , a communication module 120 , a memory 130 , a user interface 140 , and a display unit 150 .

[0133] First, the processor 110 can execute various instructions or programs to process data within the terminal 100. The processor 110 can also control the overall operation of the terminal 100, including each unit, and control data transmission and reception between the units. Here, the processor 110 may be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 110 can receive slot configuration information, determine a slot configuration based on the received information, and perform communication according to the determined slot configuration.

[0134] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 120 may include multiple network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. Although the communication module 120 is shown as an integrated module in the figure, each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawing.

[0135] The cellular communication interface card 121 can transmit and receive wireless signals to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and can provide 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 can include at least one NIC module using a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 121 can independently perform cellular communication with at least one of the base station 200, an external device, and a server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0136] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, the external device, and the server using a mobile communication network, and can provide cellular communication services using the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz supported by the NIC module.

[0137] The unlicensed band communication interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 can perform wireless communication with at least one of the base station 200, an external device, and a server, independently or dependently, in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0138] Next, the memory 130 stores control programs and various data used by the terminal 100. Such control programs may include predetermined programs required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0139] Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. Also, the user interface 140 can perform output based on instructions from the processor 110 using various output means.

[0140] The display unit 150 then outputs various images to a display screen, and can display various display objects, such as content executed by the processor 110 or a user interface based on a control instruction of the processor 110.

[0141] Furthermore, the base station 200 according to an embodiment of the present disclosure may include a processor 210, a communication module 220, and a memory 230.

[0142] First, the processor 210 can execute various instructions or programs to process data within the base station 200. The processor 210 can also control the overall operation of each unit of the base station 200 and control data transmission and reception between the units. Here, the processor 210 may be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 210 can signal slot configuration information and perform communication according to the signaled slot configuration.

[0143] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 220 may include multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in an internal or external form. Although the communication module 220 is shown as an integrated module in the drawing, each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawing.

[0144] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, the external device, and the server using a mobile communication network, and can provide cellular communication services using the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 can include at least one NIC module using a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 can independently perform cellular communication with at least one of the terminal 100, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0145] The cellular communication interface card 222 can transmit and receive wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and can provide cellular communication services using the second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the terminal 100, an external device, and a server in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz supported by the NIC module.

[0146] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 can perform wireless communication with at least one of the terminal 100, an external device, and a server, independently or dependently, in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0147] The terminal 100 and base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present disclosure, and the separated blocks indicate logically distinct device elements. Therefore, the above-described device elements may be implemented as a single chip or multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. In addition, the user interface 140 and the display unit 150 may be further provided in the base station 200 as needed.

[0148] FIG. 12 is a diagram showing a slot structure of a TDD-based mobile communication system according to an embodiment of the present invention.

[0149] Referring to Figure 12, slots can be defined as four slot configurations: a slot containing only DL symbols (DL-only), a slot centered on DL symbols (DL-centric), a slot centered on UL symbols (UL-centric), and a slot containing only UL symbols (UL-only).

[0150] One slot can contain seven symbols. A gap (GP) may exist when changing from downlink to uplink or from uplink to downlink. That is, a gap may be inserted between the downlink and uplink or between the uplink and downlink. One symbol may be used to transmit downlink control information. Hereinafter, the symbol constituting the gap is referred to as a gap symbol.

[0151] A slot including only DL symbols (DL-only) literally includes only DL symbols. For example, a slot including only DL symbols includes seven DL symbols, as in the DL-only slot in FIG.

[0152] A DL-centric slot includes multiple DL symbols, at least one gap symbol, and at least one UL symbol. For example, a DL-centric slot may include five DL symbols, one gap symbol, and one UL symbol, as in the DL-centric slot of FIG. 12.

[0153] A UL-centric slot includes at least one DL symbol, at least one gap symbol, and multiple UL symbols. For example, a UL-centric slot may include one DL symbol, one gap symbol, and five UL symbols, as in the UL-centric slot of FIG. 12.

[0154] 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 in UL-only in FIG.

[0155] The network can inform the terminal of a default slot configuration, and RRC signaling can be used for this purpose. Information on the default slot configuration set by RRC signaling can be referred to as semi-static DL / UL allocation information. The default slot configuration is a slot configuration that the terminal can assume the network will use when the base station does not send separate signaling for changing the slot configuration to the terminal. The 3GPP NR system supports dynamic TDD, which changes the slot configuration according to various traffic conditions of the terminal. To this end, the base station can inform the terminal of the slot configuration of the current or future slots for every slot, every few slots, or every time the base station changes the slot configuration. Two methods can be used in the NR system to inform the terminal of the slot configuration.

[0156] The first method is to use a group common PDCCH. The group common PDCCH is a PDCCH broadcast to multiple terminals and may be transmitted every slot, every few slots, or only when necessary by the base station. The group common PDCCH may include a (Dynamic) Slot Format Information Indicator (SFI) to transmit information about the slot configuration. The slot format information indicator may indicate the current slot configuration in which the group common PDCCH is transmitted or several future slot configurations including the current slot configuration. When a terminal receives the group common PDCCH, the terminal can determine the current slot configuration or future slot configurations including the current slot from the slot configuration information indicator included in the group common PDCCH. If the terminal fails to receive the group common PDCCH, the terminal cannot determine whether the base station has transmitted the group common PDCCH.

[0157] The second method is to transmit information about the slot configuration in a UE-specific PDCCH that schedules a PDSCH or a PUSCH. The UE-specific PDCCH may be transmitted by unicast only to a specific user that requires scheduling. The UE-specific PDCCH may transmit the same slot format information indicator as that transmitted in the group-common PDCCH as slot configuration information of the scheduled slot. Alternatively, the UE-specific PDCCH may include information that allows the configuration of the scheduled slot to be inferred. For example, by receiving the UE-specific PDCCH allocated to itself, the UE can determine the slot to which the PDSCH or PUSCH is allocated and the position of the OFDM symbol within the slot, and can infer the configuration of the slot from these. Furthermore, the UE-specific PDCCH that schedules a PDSCH may indicate the slot in which the PUCCH, including HARQ-ACK feedback information, is transmitted and the position of the OFDM symbol within the slot, and from these, the configuration of the slot in which the PUCCH is transmitted can be inferred.

[0158] Hereinafter, a downlink signal as used in this specification refers to a radio signal transmitted from a base station to a terminal, and may include a physical downlink channel, a sequence, a reference signal (DM-RS, CSI-RS, TRS, PT-RS, etc.) generated and processed in the physical layer, and a MAC message and an RRC message (or RRC signaling) generated and processed in the MAC layer and the RRC layer, respectively. The MAC message and the RRC message may also be referred to as upper layer signaling to distinguish them from physical layer signals constituting lower layers of the OSI. Herein, the downlink physical channel may also include a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), and a physical broadcast channel (PBCH).

[0159] Furthermore, an uplink signal as used herein refers to a radio signal transmitted from a terminal to a base station, and may include a physical uplink channel, a sequence, a reference signal (SRS, etc.) generated and processed in the physical layer, and a MAC message and an RRC message (or RRC signaling) generated and processed in the MAC layer and the RRC layer, respectively. Here, the uplink physical channel may also include a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH).

[0160] FIG. 13 is a diagram illustrating a PUCCH (Physical Uplink Control Channel) used in a wireless communication system according to an embodiment of the present invention.

[0161] Referring to FIG. 13, the 3GPP NR system can use two types of PUCCH depending on the size of the time resource (i.e., the number of symbols) used to transmit the PUCCH.

[0162] The first-type PUCCH may be called a Long PUCCH and may be transmitted by being mapped to four or more consecutive symbols of a slot. The first-type PUCCH is mainly used to transmit a large amount of Uplink Control Information (UCI) or may be assigned to users with low signal strength, thereby increasing the PUCCH coverage. The first-type PUCCH may also be repeatedly transmitted in multiple slots to increase the PUCCH coverage. The first-type PUCCH may include PUCCH format 1 for transmitting UCI of 1 or 2 bits, PUCCH format 3 for transmitting UCI of more than 2 bits and not supporting inter-user multiplexing, and PUCCH format 4 for transmitting UCI of more than 2 bits and supporting inter-user multiplexing.

[0163] The second type PUCCH may be referred to as a Short PUCCH, which may be mapped to one or two symbols of a slot and transmitted, and may be used to transmit a small amount of UCI or may be assigned to users with high signal strength and may be used to support services that require low latency. The second type PUCCH may include PUCCH format 0, which transmits one or two bits of UCI, and PUCCH format 2, which transmits more than two bits of UCI.

[0164] In one slot, there may be time-frequency resources usable as a first-type PUCCH and time-frequency resources usable as a second-type PUCCH, which may be assigned to different terminals or to a single terminal. When assigned to a single terminal, the first-type PUCCH and the second-type PUCCH may be transmitted using different time resources (i.e., different OFDM symbols). That is, when assigned to a single terminal, the first-type PUCCH and the second-type PUCCH may be transmitted using time division multiplexing (TDM).

[0165] The UCI mapped to the PUCCH can include Scheduling Grant (SR), HARQ-ACK, Rank Information (RI), CSI, and Beam-related Information (BRI). SR is information that a terminal uses to notify a base station of the presence of uplink transmission. HARQ-ACK is information that indicates whether the PDSCH (Physical Downlink Shared Channel) transmitted by the base station has been successfully received. RI is information that indicates the rank that can be transmitted on a wireless channel when multiple antennas are used. CSI is information that indicates a value measured by the terminal as the channel condition between the base station and the terminal. BRI is information that indicates information regarding beamforming between the transmitting end and the receiving end.

[0166] 13(a), the illustrated DL-centric slot may be configured and indicated as five DL symbols, one flexible symbol, and one UL symbol. The DL-centric slot may be assigned a second-type PUCCH having a length of one symbol. The second-type PUCCH may be located in the last symbol of the slot.

[0167] 13(b), the illustrated UL-centric slot may be configured and indicated as one DL symbol, one flexible symbol, and five UL symbols. The UL-centric slot may be assigned a first-type PUCCH or / and a second-type PUCCH. The first-type PUCCH may be mapped to four symbols, and the second-type PUCCH may be mapped to the last symbol of the slot.

[0168] 13(c), a slot having only UL symbols (UL only) may be assigned a first-type PUCCH and / or a second-type PUCCH. For example, the first-type PUCCH may be mapped to six symbols, and the second-type PUCCH may be mapped to the last symbol of the slot.

[0169] 12 and 13, slot configurations in which the second type PUCCH can be transmitted include a slot centered on a DL symbol, a slot centered on a UL symbol, and a slot including only UL symbols, while slot configurations in which the first type PUCCH can be transmitted include a slot centered on a UL symbol and a slot including only UL symbols. Furthermore, the first type PUCCH and the second type PUCCH are time-division multiplexed, and transmittable slots are a slot centered on a UL symbol and a slot including only UL symbols. For reference, since a DL symbol-centered slot has only one symbol allocated for the uplink, the second type PUCCH can be transmitted, but the first type PUCCH cannot. Therefore, the PDCCH that schedules the PUCCH can allocate the first type PUCCH to a slot centered on a UL symbol or a slot including only UL symbols. Furthermore, the PDCCH that schedules the PUCCH can allocate the second type PUCCH to a slot centered on a DL symbol, a slot centered on a UL symbol, or a slot including only UL symbols.

[0170] As described above, the base station (or network) can change the slot configuration according to the traffic of the terminal and various conditions, and can notify the terminal of the change in the slot configuration. Since the slot configuration can change in this way, the terminal must receive a slot configuration information indicator or information about the slot configuration by monitoring the group common PDCCH and the terminal specific PDCCH. However, due to inconveniences such as radio channel conditions and interference between the base station and the terminal, the terminal may fail to receive the group common PDCCH and the terminal specific PDCCH.

[0171] If a terminal fails to receive a group-common PDCCH and / or a terminal-specific PDCCH, the terminal cannot recognize whether the base station has changed the slot configuration. However, if the base station changes the slot configuration and the PUCCH transmission scheduled by the terminal is not suitable for the changed slot configuration, if the terminal forces the PUCCH transmission as scheduled, the PUCCH transmission may fail, which may lead to problems such as temporary communication interruption or delay. Therefore, in such a case, a clear procedure or a predetermined agreement between the terminal and the base station is required for the terminal to transmit the instructed PUCCH or to give up, or if it is to transmit, how to transmit.

[0172] Hereinafter, a method for operating a terminal and a base station to resolve a case where a terminal fails to receive a group-common PDCCH and / or a terminal-specific PDCCH including a slot configuration information indicator and slot configuration related information will be described.

[0173] In addition, when a terminal successfully receives a group-shared PDCCH and / or a terminal-specific PDCCH including a slot configuration information indicator and slot configuration related information, but the assigned PUCCH cannot be transmitted due to a change in the configuration of the slot to which the PUCCH is assigned (or to which the PUCCH is scheduled to be transmitted), a terminal that processes the transmission of the PUCCH and its operating method, and a base station that processes the reception of the assigned PUCCH and its operating method are defined.

[0174] (First Example)

[0175] The first embodiment relates to a method for realizing a predictable communication state between a terminal and a base station by imposing certain constraints on the change of slot configuration of the base station. In this case, the PUCCH transmission of the terminal can be performed regardless of whether the terminal has successfully received a group common PDCCH and a terminal specific PDCCH.

[0176] (Method 1) - The slot configuration of the slot containing the symbol to which the PUCCH is assigned (or transmitted) remains the same without any change.

[0177] Method 1 may be applied separately depending on the type of the allocated (or transmitted) PUCCH, that is, whether the PUCCH is a first type PUCCH or a second type PUCCH.

[0178] i) The slot configuration of the symbol to which the first-type PUCCH is allocated (or transmitted) is not changed and remains the same. That is, the base station does not change the slot configuration of the OFDM symbol to which the first-type PUCCH is allocated (or transmitted), and the terminal similarly assumes (or promises, or expects) that the slot configuration of the OFDM symbol to which the first-type PUCCH is allocated (or transmitted) is not changed. Therefore, the terminal can transmit the first-type PUCCH regardless of receiving the slot configuration information indicator and slot configuration-related information transmitted in the group-common PDCCH and the terminal-specific PDCCH.

[0179] ii) The slot configuration of the symbols to which the second-type PUCCH is assigned (or transmitted) is not changed and remains the same. That is, the base station does not change the slot configuration of the symbols to which the second-type PUCCH is assigned (or transmitted), and the terminal similarly assumes (or promises or expects) that the slot configuration of the symbols to which the second-type PUCCH is assigned (or transmitted) is not changed. Therefore, the terminal can transmit the second-type PUCCH regardless of receiving the slot configuration information indicator and slot configuration-related information transmitted in the group-common PDCCH and the terminal-specific PDCCH.

[0180] The above-mentioned method 1 has some disadvantages in terms of flexibility of scheduling. Therefore, a method according to another aspect, which allows the base station to change the slot configuration within a certain range, will be described below.

[0181] (Method 2) - The slot configuration of the symbol to which PUCCH is assigned (or transmitted) can only be changed within a certain range.

[0182] Even if the slot configuration of a symbol to which a PUCCH is allocated (or transmitted) is changed, it can only be changed to a slot configuration in which PUCCH transmission is possible, and cannot be changed to a slot configuration in which PUCCH transmission is impossible. Therefore, the terminal does not expect that a slot in which PUCCH transmission is instructed by the base station will be changed to a slot in which PUCCH transmission is impossible. Method 2 may be applied separately depending on the type of the allocated (or transmitted) PUCCH, i.e., whether the PUCCH is a first type PUCCH or a second type PUCCH.

[0183] i) When changing the slot configuration of a symbol to which a first-type PUCCH is allocated, the base station can only change the slot configuration to one that allows transmission of the first-type PUCCH, and cannot change the slot configuration to one that does not allow transmission of the first-type PUCCH. Therefore, the terminal does not expect that a slot instructed by the base station to transmit the first-type PUCCH will be changed to a slot that does not allow transmission of the first-type PUCCH. Even if the terminal fails to receive a group common PDCCH that includes a slot configuration information indicator for a slot in which the first-type PUCCH is to be transmitted, the terminal can always transmit the first-type PUCCH using the allocated resources.

[0184] For example, a base station can change a slot centered on an UL symbol to which a 4-OFDM symbol long first-type PUCCH is assigned to a slot including only UL symbols, but cannot change it to a slot including only DL symbols with one UL symbol or a slot centered on DL symbols. Meanwhile, a terminal can expect that a 4-OFDM symbol long first-type PUCCH slot centered on an UL symbol to which a base station instructs transmission can be changed to a slot including only UL symbols, but does not expect the change to a slot including only DL symbols or a slot centered on DL symbols. Furthermore, a terminal does not expect a change in the slot configuration in which a UL symbol instructed by a base station to transmit a first-type PUCCH is changed to a DL symbol.

[0185] ii) When changing the slot configuration of a symbol to which the second type PUCCH is allocated, the base station can change the slot configuration to one that allows transmission of the second type PUCCH, but cannot change the slot configuration to one that does not allow transmission of the second type PUCCH. Therefore, the terminal does not expect the base station to change a slot in which transmission of the second type PUCCH is instructed by the base station to one that does not allow transmission of the second type PUCCH. Even if the terminal fails to receive a group common PDCCH including a slot configuration information indicator for a slot in which the second type PUCCH is to be transmitted, the terminal can always transmit the second type PUCCH using the allocated resources. More specifically, the base station can change a slot centered on a UL symbol to which the second type PUCCH is allocated to a slot centered on a DL symbol in which transmission of the second type PUCCH is possible or a slot including only UL symbols, but cannot change it to a slot including only DL symbols in which transmission of the second type PUCCH is not possible. Furthermore, the terminal does not expect the base station to change a slot in which transmission of the second type PUCCH is instructed to be transmitted to one that does not allow transmission of the second type PUCCH.

[0186] For example, the terminal can expect (or predict) that a slot centered on a UL symbol to which a second-type PUCCH of one or two symbols long, which is instructed to be transmitted by a base station, is allocated will be changed to a slot centered on a DL symbol in which the second-type PUCCH may be included or a slot including only UL symbols, but will not expect (or predict) that the slot will be changed to a slot including only DL symbols in which the second-type PUCCH may not be included.Furthermore, the terminal does not expect a change in the slot configuration in which a UL symbol instructed by a base station to transmit a second-type PUCCH is changed to a DL symbol.

[0187] Below, a further method will be described in another aspect for further increasing the flexibility of scheduling compared to the above-mentioned method 2, which allows the slot configuration of the base station to be changed within a certain range.

[0188] (Method 3) - The slot configuration of the symbol to which PUCCH is assigned (or transmitted) can be freely changed.

[0189] The base station can freely change the configuration of slots to which PUCCHs are allocated.

[0190] If the PUCCH is a first-type PUCCH, the terminal may not transmit the first-type PUCCH on the allocated resources if it fails to receive a group-shared PDCCH including a slot configuration information indicator for the slot in which the first-type PUCCH is transmitted.

[0191] If the PUCCH is a second-type PUCCH, the terminal may not transmit the second-type PUCCH on the allocated resources if it fails to receive a group-common PDCCH including a slot configuration information indicator for the slot in which the second-type PUCCH is transmitted.

[0192] When the above-mentioned method is applied, even if a terminal fails to receive a group-shared PDCCH and / or a terminal-specific PDCCH from a base station, problems such as communication errors or delays can be resolved because whether or not to transmit a scheduled PUCCH and the transmission procedure are clearly defined.

[0193] (Second Example)

[0194] The second embodiment relates to an operation procedure between a terminal and a base station when the base station is free to change the slot configuration and the terminal has successfully received at least one of a group-common PDCCH and a terminal-specific PDCCH that includes a slot configuration information indicator and slot configuration related information.

[0195] More specifically, the present invention relates to a terminal that processes transmission of a PUCCH and its operating method, and a base station that processes reception of a PUCCH and its operating method when the configuration of a slot to which a PUCCH is assigned (or for which a PUCCH is scheduled to be transmitted) is changed and the changed slot configuration is contradictory to the PUCCH (i.e., when a symbol to which the PUCCH is assigned in a slot to which the PUCCH is assigned overlaps with a DL symbol due to the changed slot configuration).

[0196] In the changed slot configuration, the transmission of the assigned PUCCH may or may not be possible (or valid or compatible) (if the slot configuration is inconsistent). Here, referring to FIG. 13, slots in which the PUCCH can be transmitted may be UL symbol-centered slots or slots including only UL symbols to which the first type PUCCH is assigned, DL symbol-centered slots or UL symbol-centered slots or slots including only UL symbols to which the second type PUCCH is assigned, etc. Meanwhile, slots in which the PUCCH cannot be transmitted may be, for example, slots after the slots to which the first type PUCCH is assigned are changed to slots to which the slot configuration is centered on DL symbols or including only DL symbols, or slots after the slots to which the second type PUCCH is assigned are changed to slots including only DL symbols.

[0197] When the configuration of a slot instructed to transmit a PUCCH is changed, if the PUCCH transmission is possible (or valid or suitable) in the changed slot configuration, the UE can transmit the PUCCH using the changed slot. However, if the configuration of the designated slot is changed and conflicts with the PUCCH transmission, a special protocol is required between the UE and the base station to transmit the PUCCH.

[0198] Hereinafter, this specification will describe a method for processing a PUCCH under an inconsistent slot configuration. Since uplink control information (UCI) can be transmitted to a base station via a PUCCH, the PUCCH described in this specification may be used interchangeably with UCI. For example, a method for processing a PUCCH under an inconsistent slot configuration corresponds to a method for processing UCI (HARQ-ACK, RI, etc.) under an inconsistent slot configuration.

[0199] (Method 1) - How to process PUCCH in the specified slot

[0200] First, a PUCCH processing method under an inconsistent slot configuration when the allocated PUCCH is a first-type PUCCH will be described. UCI (HARQ-ACK, RI, CSI, etc.) described in FIG. 3 is mapped to the first-type PUCCH.

[0201] Regarding a PUCCH processing method, a terminal receives a group common PDCCH including a slot configuration information indicator of a slot instructed to transmit a first type PUCCH, and can transmit the first type PUCCH or the second type PUCCH in the instructed slot. In this case, the terminal may transmit the first type PUCCH or the second type PUCCH in the instructed slot in consideration of the following conditions.

[0202] For example, the terminal may transmit the first type PUCCH in a specified slot based on a result of comparing the UL symbols according to the slot configuration of the slot in which transmission of the first type PUCCH is instructed with the UL symbols allocated for transmitting the first type PUCCH. If the UL symbols according to the slot configuration of the slot in which transmission of the first type PUCCH is instructed are larger than (or larger than or equal to) the UL symbols required for transmitting the first type PUCCH, the terminal transmits the first type PUCCH using the allocated resources in the slot.

[0203] As another example, the terminal may transmit the first type PUCCH or drop or suspend transmission based on a result of comparing the number of UL symbols according to the slot configuration in a slot instructed to transmit the first type PUCCH with the number of UL symbols required to transmit the first type PUCCH. Specifically, if the number of UL symbols according to the slot configuration in a slot instructed to transmit the first type PUCCH is smaller than the number of UL symbols required to transmit the first type PUCCH, the terminal may drop the transmission of the first type PUCCH in the instructed slot. For example, if the slot instructed to transmit the PUCCH is a multiple slot, the terminal may delay the transmission of the first type PUCCH to a second slot that provides the UL symbols required to transmit the first type PUCCH, rather than the scheduled first slot, and transmit the first type PUCCH in the second slot. On the other hand, if the slot instructed to transmit the PUCCH is a single slot, the terminal can abandon or suspend the scheduled transmission of the first type PUCCH.

[0204] As yet another example, the terminal may transmit the first type PUCCH based on a result of comparing the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot instructed to transmit the first type PUCCH with the number of UL symbols allocated for transmitting the first type PUCCH. Specifically, if the sum of the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot instructed to transmit the first type PUCCH is greater than (or is greater than or equal to) the number of UL symbols required for transmitting the first type PUCCH, the terminal transmits the first type PUCCH using the allocated resources in the slot.

[0205] As another example, the UE may transmit the first type PUCCH, or may drop or suspend the transmission, based on a result of comparing the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot in which transmission of the first type PUCCH is instructed with the number of UL symbols allocated for transmission of the first type PUCCH. Specifically, if the sum of the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot in which transmission of the first type PUCCH is instructed is smaller than the number of UL symbols required for transmission of the first type PUCCH, the UE may drop the transmission of the first type PUCCH in the instructed slot. If the slot in which PUCCH transmission is instructed is a multiple slot, the UE may transmit the first type PUCCH in a slot among the multiple slots that satisfies the number of UL symbols allocated for transmission of the first type PUCCH. On the other hand, if the slot in which PUCCH transmission is instructed is a single slot, the UE may drop or suspend the scheduled transmission of the first type PUCCH.

[0206] As another example of a method for processing a PUCCH, a terminal may receive a group common PDCCH and a terminal specific PDCCH indicating the slot configuration of a slot in which transmission of a first type PUCCH is instructed, and transmit the first type PUCCH or the second type PUCCH according to a condition described below. In this case, the terminal may determine whether to transmit the first type PUCCH in the instructed slot according to a condition described below.

[0207] FIG. 14 is a diagram illustrating a method for transmitting a PUCCH on a slot according to an embodiment of the present invention.

[0208] For example, i) the base station can change the configuration of the slot to which the first type PUCCH is assigned, ii) when the terminal successfully receives the group common PDCCH and terminal specific PDCCH that indicate the configuration of the slot to which the first type PUCCH is assigned, iii) if the configuration of the slot is a slot that can transmit the first type PUCCH, the terminal can transmit the first type PUCCH using the allocated resources of the slot.

[0209] As another example, i) the base station can change the configuration of the slot to which the first type PUCCH is allocated, and ii) the terminal can successfully receive the group common PDCCH and terminal specific PDCCH that indicate the configuration of the slot to which the first type PUCCH is allocated. iii) However, if the slot configuration is a slot that cannot transmit the first type PUCCH, the terminal can either not transmit the first type PUCCH in the slot, transmit a first type PUCCH that matches the changed slot configuration, or transmit a second type PUCCH in the slot instead of the first type PUCCH (see FIG. 14). A specific PUCCH transmission operation of the terminal can be summarized as follows.

[0210] a. The terminal does not transmit the allocated first-type PUCCH.

[0211] b-1. If the slot configuration (or format) has a symbol length (e.g., 4 to 12 symbols) that can configure the first type PUCCH, and the number of UL symbols that can configure the first type PUCCH in the slot is smaller than the number of first type PUCCH symbols that have already been set to be transmitted, the terminal transmits the first type PUCCH to fit the UL symbols that can be transmitted in the changed slot configuration (or format), or even if it is less than the number of UL symbols, to fit a length of at least 4 symbols.

[0212] b-2. The transmission of the UCI intended for the terminal may be configured to transmit a first type PUCCH that fits a fixed symbol length (e.g., 4 symbols long) regardless of the UL symbols that can be transmitted in the corresponding slot.

[0213] c. If the slot configuration is such that a first-type PUCCH cannot be transmitted but a second-type PUCCH can be transmitted, the terminal can transmit the second-type PUCCH in the slot instead of transmitting the assigned first-type PUCCH. Meanwhile, the amount of UCI that can be transmitted via the second-type PUCCH in the slot may be limited. In this case, the terminal can transmit UCI based on at least one of the methods described below.

[0214] c-1. The UE may transmit some information depending on the importance of UCI that must be transmitted via the first-type PUCCH. For example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the following order: HARQ-ACK, Rank information (RI), Channel state information (CSI), and beam-related information (BRI, e.g., beam recovery request) (i.e., HARQ-ACK > RI > CSI > BRI). As yet another example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the following order: HARQ-ACK, beam-related information, RI, and CSI (i.e., HARQ-ACK > BRI > RI > CSI). As yet another example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the following order: beam-related information, HARQ-ACK, RI, and CSI (i.e., BRI > HARQ-ACK > RI > CSI).

[0215] c-2. The terminal can transmit some of the information with high importance via the second-type PUCCH depending on the amount of UCI that can be transmitted via the second-type PUCCH.

[0216] c-3. When the information transmitted via the first type PUCCH includes information on a primary serving cell (PCell) and a secondary serving cell (SCell), the terminal may transmit some of the information depending on the importance or priority between the PCell and the SCell. For example, the terminal may transmit only information related to the PScell ​​via the second type PUCCH. As another example, when the information transmitted via the first type PUCCH includes information on the PCell or a primary secondary serving cell (PSCell), the terminal may transmit only information related to the PCell or the PScell ​​via the second type PUCCH.

[0217] c-4. The terminal may preferentially transmit UCI for DL ​​associated with a PUCCH transmittable cell (for example, SIB linked to DL cell) on each PUCCH group using the second type PUCCH.

[0218] c-5. The UE may transmit the second type PUCCH based on the importance between the SCell and the PCell and the importance of the UCI. For example, the UE may transmit, via the second type PUCCH, a type of UCI with a higher priority among UCIs associated with the PCell (HARQ-ACK, BRI, RI, CSI, etc.). In c-5, the type of UCI associated with a serving cell is given priority over the type of UCI transmitted via the second type PUCCH. Of course, the type of UCI transmitted via the second type PUCCH may be given priority over the type of serving cell associated with the UCI. The priority between the serving cell and the UCI may be included in configuration information such as RRC signaling and transmitted by the base station to the UE, or may be defined individually depending on the payload size of the second type PUCCH.

[0219] c-6. The terminal can transmit only UCI up to a certain number of bits via the second-type PUCCH according to the payload size of the UCI. For example, the terminal may be configured to transmit UCI up to X bits via the second-type PUCCH, where X may be 2 to several tens of bits.

[0220] c-7. The terminal may be configured to transmit up to X bits of HARQ-ACK or BRI on the second-type PUCCH based on a specific type of UCI (e.g., HARQ-ACK or BRI), where X may be 2 to several tens of bits.

[0221] As another example, there may be a case where i) the base station can change the configuration of the slot to which the first-type PUCCH is allocated, and ii) the terminal has successfully received the group-common PDCCH and the terminal-specific PDCCH informing the configuration of the slot to which the first-type PUCCH is allocated, and in this case, iii) the slot configuration is a slot in which the first-type PUCCH can be transmitted, iv) a PUSCH is allocated to the slot (or PUSCH transmission is scheduled) and simultaneous transmission of the PUCCH and PUSCH is configured, and v) the terminal is configured not to transmit the first-type PUCCH because inter-modulation distortion (IMD) may occur due to frequency separation between the PUCCH and the PUSCH, and therefore the terminal performs at least one of the above-described specific operations (a to c-7).

[0222] Next, a case where the allocated PUCCH is a second-type PUCCH will be described. UCI (HARQ-ACK, RI, CSI, etc.) described in Fig. 3 is mapped to the second-type PUCCH.

[0223] Regarding a method of processing the PUCCH, the terminal receives a group common PDCCH including a slot configuration information indicator of a slot in which transmission of the second type PUCCH is instructed, and can transmit the second type PUCCH in the instructed slot. In this case, whether the terminal transmits the second type PUCCH in the instructed slot may take into consideration the conditions described below.

[0224] For example, the terminal can transmit the second type PUCCH based on a result of comparing the number of UL symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH with the number of UL symbols allocated for transmitting the second type PUCCH. Specifically, if the number of UL symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH is greater than (or equal to or greater than) the number of UL symbols required for transmitting the second type PUCCH, the terminal transmits the second type PUCCH using the allocated resources in the slot.

[0225] As another example, the UE may transmit the second type PUCCH, or drop or suspend transmission based on a result of comparing the number of UL symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH with the number of UL symbols required to transmit the second type PUCCH. Specifically, if the number of UL symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH is smaller than the number of UL symbols allocated to transmit the second type PUCCH, the UE may drop the transmission of the second type PUCCH in the instructed slot. For example, if the slot instructed to transmit the PUCCH is a multiple slot, the UE may transmit the second type PUCCH in a second slot among the multiple slots that satisfies the number of UL symbols required to transmit the second type PUCCH. On the other hand, if the slot instructed to transmit the PUCCH is a single slot, the UE may drop or suspend the scheduled second type PUCCH transmission.

[0226] As yet another example, the terminal may transmit the second type PUCCH based on a result of comparing the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH with the number of UL symbols allocated for transmitting the second type PUCCH. Specifically, if the sum of the number of UL symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH and the number of symbols including flexible symbols is greater than (or is greater than or equal to) the number of UL symbols required for transmitting the second type PUCCH, the terminal transmits the second type PUCCH using the allocated resources in the slot.

[0227] As another example, the UE may transmit the second type PUCCH or drop or suspend transmission based on a result of comparing the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH with the number of UL symbols required to transmit the second type PUCCH. Specifically, if the sum of the number of UL symbols and the number of flexible symbols according to the slot configuration in a slot instructed to transmit the second type PUCCH is less than the number of UL symbols required to transmit the second type PUCCH, the UE may drop the transmission of the second type PUCCH in the instructed slot. For example, if the slot instructed to transmit the PUCCH is a multiple slot, the UE may transmit the second type PUCCH in a second slot among the multiple slots that satisfies the number of UL symbols required to transmit the second type PUCCH. On the other hand, if the slot instructed to transmit the PUCCH is a single slot, the UE may drop or suspend the scheduled second type PUCCH transmission.

[0228] (Method 2) - How to process PUCCH in a slot other than the specified slot

[0229] Regarding the PUCCH processing method according to method 2, when the configuration of a slot instructed to transmit a PUCCH is changed, the UE can transmit the PUCCH in another slot after the indicated slot. That is, when an UL symbol carrying the PUCCH in a slot to which a PUCCH is assigned overlaps with a DL symbol in the slot according to the changed slot configuration, the UE can postpone or defer transmission of the PUCCH to another slot in which PUCCH transmission is possible, rather than the indicated slot.

[0230] In the postponed other slot, a PUCCH of the same type as the assigned PUCCH of the specific type may be transmitted, or a PUCCH of a different type from the assigned PUCCH of the specific type may be transmitted. The resources when the PUCCH of the same type as the assigned PUCCH of the specific type is transmitted in the postponed other slot may be different from the resources in the time domain for transmitting the already assigned PUCCH of the specific type.

[0231] This specification will first describe a PUCCH processing method in an inconsistent slot configuration when the allocated PUCCH is a first-type PUCCH. In this case, the first-type PUCCH may include UCI, particularly HARQ-ACK, RI, CSI, etc., as described in Figure 3. Since the information mapped to the first-type PUCCH is UCI, the PUCCH described in this specification may be used interchangeably with UCI.

[0232] FIG. 15 is a diagram showing an example of a configuration in which the slot configuration is changed so that the PUCCH is transmitted in another slot.

[0233] 15(a), the UE can recognize that the UL symbol-centered slot N to which the first type PUCCH (Long PUCCH) is allocated has been changed by the base station to a DL symbol-centered slot in which the first type PUCCH is not transmitted, by receiving the group common PDCCH and / or UE-specific PDCCH indicating the slot configuration change. In this case, the UE does not transmit the first type PUCCH in slot N, but can transmit the first type PUCCH in a postponed slot N+K. That is, a first type PUCCH of the same type as the allocated first type PUCCH is transmitted in the postponed slot N+K. Here, slot N+K is the nearest slot in which the allocated first type PUCCH can be transmitted, and may be a UL symbol-centered slot.

[0234] That is, if the base station changes the configuration of the slot to which the first type PUCCH is assigned, and the terminal successfully receives the group common PDCCH and terminal specific PDCCH including information on the slot configuration, but the slot configuration is a slot in which the first type PUCCH cannot be transmitted, the terminal does not transmit the first type PUCCH in that slot, but can transmit the first type PUCCH in the nearest subsequent slot in which the first type PUCCH can be transmitted.

[0235] Meanwhile, referring to FIG. 15(b), the UE can recognize that slot N, which is centered on a UL symbol and to which a first-type PUCCH (Long PUCCH) is allocated, has been changed by the base station to a slot configuration in which the first-type PUCCH cannot be transmitted, by receiving a group common PDCCH and / or a UE-specific PDCCH indicating a change in slot configuration. In this case, the UE does not transmit the first-type PUCCH in slot N, but can transmit a second-type PUCCH (Short PUCCH) in slot N+K. A second-type PUCCH of a different type from the allocated first-type PUCCH is transmitted in the postponed slot N+K. That is, a second-type PUCCH of a different type from the allocated first-type PUCCH is transmitted in the postponed slot N+K. Here, slot N+K is the nearest slot in which the second-type PUCCH can be transmitted, and may be a slot centered on a DL symbol.

[0236] That is, if the base station changes the configuration of the slot to which the first type PUCCH is assigned, and the terminal successfully receives the group common PDCCH and terminal specific PDCCH including 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 transmit the second type PUCCH in the nearest subsequent slot in which the second type PUCCH can be transmitted.

[0237] Here, the UCI transmitted via the second-type PUCCH may include only a portion of the UCI that was originally scheduled to be transmitted, depending on its importance, and may not include the remaining portion.

[0238] The UE may transmit some information depending on the importance of UCI that must be transmitted via the first-type PUCCH. For example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the order of HARQ-ACK, Rank information (RI), Channel state information (CSI), and beam-related information (BRI, e.g., beam recovery request) (i.e., HARQ-ACK > RI > CSI > BRI). As yet another example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the order of HARQ-ACK, beam-related information, RI, and CSI (i.e., HARQ-ACK > BRI > RI > CSI). As yet another example, the importance or priority of information that can be transmitted via the first-type PUCCH may be defined in the order of beam-related information, HARQ-ACK, RI, and CSI (i.e., BRI > HARQ-ACK > RI > CSI).

[0239] Depending on the amount of UCI that can be transmitted via the second-type PUCCH, the terminal can transmit some of the information with high importance via the second-type PUCCH.

[0240] When the information transmitted via the first type PUCCH includes information on a primary serving cell (PCell) and a secondary serving cell (SCell), the terminal may transmit some of the information depending on the importance or priority between the PCell and the SCell. For example, the terminal may transmit only information related to the PScell ​​via the second type PUCCH. As yet another example, when the information transmitted via the first type PUCCH includes information on the PCell or a primary secondary serving cell (PSCell), the terminal may transmit only information related to the PCell or the PScell ​​via the second type PUCCH.

[0241] The terminal may preferentially transmit UCI for DL ​​associated with a PUCCH transmittable cell (for example, SIB linked to DL cell) on each PUCCH group using the second type PUCCH.

[0242] The UE may transmit the second type PUCCH based on the importance between the SCell and the PCell and the importance of the UCI. For example, the UE may transmit UCI of a higher priority type among UCI associated with the PCell (HARQ-ACK, beam-related information, RI, CSI, etc.) via the second type PUCCH. c-5 prioritizes which serving cell the UCI is associated with over the type of UCI transmitted via the second type PUCCH. Of course, the type of UCI transmitted via the second type PUCCH may be prioritized over which serving cell the UCI is associated with. The priority between the serving cell and the UCI may be included in configuration information such as RRC signaling and transmitted by the base station to the UE, or may be individually defined depending on the payload size of the second type PUCCH.

[0243] The terminal can transmit only UCI up to a certain number of bits via the second-type PUCCH depending on the payload size of the UCI. For example, the terminal may be configured to transmit UCI up to X bits via the second-type PUCCH, where X may be 2 to several tens of bits.

[0244] The terminal may be configured to transmit up to X bits of HARQ-ACK or BRI on the second-type PUCCH based on a specific type of UCI (e.g., HARQ-ACK or BRI), where X may be 2 to several tens of bits.

[0245] (Method 3) - How to process HARQ-ACK in a slot other than the specified slot

[0246] Regarding the method of processing HARQ-ACK, the base station changes the configuration of slot N to which a PUCCH is allocated, and the terminal can receive a group-common PDCCH and / or a terminal-specific PDCCH including information about the changed slot configuration. In this case, if the assigned PUCCH cannot be transmitted under the changed slot configuration (i.e., if the changed slot configuration is inconsistent with the assigned PUCCH), the terminal can transmit the assigned PUCCH after delaying HARQ-ACK information from slot N by K slots (i.e., N+K). The "allocated PUCCH" may be a first-type PUCCH or a second-type PUCCH. The value of K may be determined based on the time required from PDSCH scheduling by the base station to PUCCH feedback. Slots in which a PUCCH can be transmitted after slot N+K may not be allocated with PUCCHs for HARQ-ACK feedback of other terminals. For example, when a terminal and a base station communicate on an FDD (Frequency Division Duplex) basis, a PUCCH for HARQ-ACK of another terminal may not be transmitted (or allocated) in a slot transmitted after 4 ms (common to 3GPP LTE, LTE-A, and NR). The value of K may be provided by an RRC signal.

[0247] Regarding another method of processing HARQ-ACK, the base station changes the configuration of slot N to which the first-type PUCCH is allocated, and the terminal can receive a group-common PDCCH and / or a terminal-specific PDCCH including information about the changed slot configuration. In this case, if the first-type PUCCH cannot be transmitted in the changed slot configuration but the second-type PUCCH can be transmitted, the terminal can not transmit the first-type PUCCH and wait / request PUCCH reallocation from the base station. For example, the base station can retransmit a PDSCH to a terminal that does not transmit a first-type PUCCH including a HARQ-ACK for the PDSCH, and can allocate new resources for transmitting the first-type PUCCH in the PDCCH that schedules the PDSCH.

[0248] Regarding another method of processing HARQ-ACK, the base station can change the configuration of slot N to which a PUCCH is allocated. If the terminal fails to receive the group-common PDCCH transmitting configuration information of slot N but receives a terminal-specific PDCCH scheduling a PDSCH (or a PUSCH) and knows the slot configuration of slot N, the terminal can selectively transmit the PUCCH based on the slot configuration. For example, if the slot configuration is a slot configuration in which the allocated PUCCH can be transmitted, the terminal can transmit the PUCCH. As another example, if the slot configuration is a slot configuration in which the allocated PUCCH cannot be transmitted, the terminal may not transmit the PUCCH. Here, the allocated PUCCH may be a first-type PUCCH or a second-type PUCCH.

[0249] (Third Example)

[0250] The third embodiment relates to information about slot configurations that a base station transmits to a terminal, and an operation method of the terminal and the base station based on this information. The base station can notify the terminal of the information about slot configurations using various information and procedures.

[0251] (Method 1) - Information about slot configuration

[0252] The information on the slot configuration includes semi-static DL / UL assignment information. For example, the base station may transmit default slot format or semi-static DL / UL assignment information (or semi-static slot-format information, SFI) to the terminal in a cell-specific manner and then transmit the semi-static DL / UL assignment information to the terminal in a terminal-specific RRC message. In this case, upon receiving the semi-static DL / UL assignment information (or default slot format), the terminal knows what slot configuration the subsequent slots have. Specifically, the semi-static DL / UL assignment information (or default slot format) indicates whether each symbol in the slot is a DL symbol, a UL symbol, or a flexible symbol that is neither a DL symbol nor a UL symbol. Here, the terminal may assume that a symbol that is not designated as a DL symbol or a UL symbol by the semi-static DL / UL assignment information (or default slot format) is designated as 'flexible'.

[0253] The information about the slot configuration includes dynamic slot-format information (SFI) that is transmitted in the group-common PDCCH. The dynamic slot format information indicates information about whether each symbol in the slot is a DL symbol, an UL symbol, or a flexible symbol that is neither a DL symbol nor an UL symbol. The flexible symbol may replace a gap or may be used for purposes other than a gap. The group-common PDCCH on which the dynamic slot format information is transmitted may be scrambled with the SFI-RNTI. Whether a terminal monitors the dynamic slot format information may be configured or indicated by an RRC message. A terminal that is not instructed to monitor by an RRC message does not need to monitor the dynamic slot format information.

[0254] The information on the slot configuration may be scheduling information included in downlink control information (DCI) mapped to a terminal-specific PDCCH. For example, if the DCI includes information on the start position and length of a PDSCH, the symbol on which the PDSCH is scheduled may be assumed to be a DL symbol. Also, if the DCI includes information on the start position and length of a PUSCH, the symbol on which the PUSCH is scheduled may be assumed to be an UL symbol. If the DCI includes information on the start position and length of a PUCCH for HARQ-ACK transmission, the symbol on which the PUCCH is scheduled may be assumed to be an UL symbol.

[0255] (Method 2) - Symbol direction determination method and PUCCH processing method

[0256] As described above, since there are various types of slot configuration information, the UE may receive information about different types of slot configurations for the same slot. The information about each slot configuration may indicate different symbol directions for the same slot to the BS. In this case, the UE and the BS may follow the following rules to determine whether or how to change the symbol direction.

[0257] The directions of the DL symbols and UL symbols in the semi-static DL / UL allocation information (or default slot format) do not change depending on the dynamic slot configuration information or scheduling information. Therefore, if the PUCCH is located in the UL symbol set by the semi-static DL / UL allocation information (or default slot format), the UE can transmit the PUCCH regardless of the dynamic slot configuration information or scheduling information. If at least one symbol of the symbols to which the PUCCH is allocated overlaps with a DL symbol in the default slot format, the UE either does not transmit the PUCCH or changes the length of the PUCCH to match the length of the remaining symbols other than the DL symbol. Here, the allocated PUCCH may be a first type PUCCH or a second type PUCCH.

[0258] The direction of the flexible symbol set by the semi-static DL / UL allocation information (or the default slot format) may be determined or changed according to the dynamic slot configuration information or the scheduling information. If at least one symbol among the symbols to which the PUCCH is allocated overlaps with a flexible symbol of the semi-static DL / UL allocation information (or the default slot format), the UE may determine whether to transmit the PUCCH according to the type (e.g., HARQ-ACK, RI, SR, CSI, etc.) of information (i.e., UCI) transmitted by the PUCCH. In this case, the PUCCH may be a first type PUCCH or a second type PUCCH. For example, if the information transmitted by the PUCCH includes a HARQ-ACK for a PDSCH, the UE transmits the PUCCH at a predetermined position regardless of the dynamic slot configuration information indicated by the group common PDCCH. Here, the predetermined position is indicated by the DCI scheduling the PDSCH. On the other hand, if the information transmitted on the PUCCH does not include HARQ-ACK for the PDSCH, the terminal transmits the PUCCH when the flexible symbol overlapping with the PUCCH is indicated as a UL symbol by the dynamic slot configuration information.

[0259] If at least one symbol among the symbols to which the PUCCH is allocated is indicated as a symbol other than a UL symbol (for example, a DL symbol or a flexible symbol) by the dynamic slot configuration information, the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic slot configuration information for the symbols to which the PUCCH is allocated, the terminal does not transmit the PUCCH.

[0260] When at least one symbol of the symbols to which the PUCCH is allocated overlaps with a flexible symbol set by the semi-static DL / UL allocation, the UE can determine whether to transmit the PUCCH based on the signaling that triggers the transmission of the PUCCH. For example, when the PUCCH is triggered by DCI, the UE transmits the PUCCH at a predetermined position regardless of the dynamic slot configuration information. Here, the predetermined position is indicated by the DCI. On the other hand, when the PUCCH is triggered by a UE-specific RRC message, the UE transmits the PUCCH when the symbol to which the PUCCH is allocated is indicated as an UL symbol by the dynamic slot configuration information.

[0261] If the dynamic slot configuration information indicates that at least one symbol among the symbols to which the PUCCH is assigned is a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol), the terminal does not transmit the PUCCH. Alternatively, if the terminal fails to receive the dynamic slot configuration information for the symbols to which the PUCCH is assigned, the terminal does not transmit the PUCCH.

[0262] (Method 3) - Processing method for repeated PUCCH

[0263] The UE can repeatedly transmit the PUCCH across multiple slots. In this specification, such a PUCCH is referred to as a repetition PUCCH. The repetition PUCCH may be a first-type PUCCH or a second-type PUCCH. The base station can configure the number of slots in which the repetition PUCCH is transmitted to the UE using an RRC message. The start and end symbols of the PUCCH within each slot may be the same for each repeated slot. The UE may or may not transmit the repetition PUCCH depending on whether DL symbols, UL symbols, and flexible symbols are configured by RRC, such as semi-static DL / UL allocation information (or default slot pattern), or dynamic slot configuration information. The following describes how to process the repetition PUCCH for each case.

[0264] (Method 3-1) - When repeated PUCCH overlaps with UL symbols

[0265] If a UL symbol set by semi-static DL / UL allocation information (or default slot pattern) is located in each slot of the slots instructed to transmit a repeated PUCCH, the UE can transmit the PUCCH in the slot where the UL symbol is located, regardless of receiving dynamic slot configuration information or scheduling information. Here, the direction of the DL symbol and the UL symbol according to the slot configuration set by an RRC message such as semi-static DL / UL allocation information (or default slot pattern) does not change depending on the dynamic slot configuration information or scheduling information.

[0266] (Method 3-2) - When repeated PUCCH overlaps with DL symbols

[0267] In each slot in which a repetition PUCCH is instructed to be transmitted, if at least one symbol among the symbols assigned to the repetition PUCCH overlaps with a DL symbol according to semi-static DL / UL allocation information, the terminal does not transmit the PUCCH in the slot including the symbol overlapping with the DL symbol, or changes the length of the PUCCH to match the length of the remaining symbols other than the overlapping DL symbol. Alternatively, in any one slot in which a repetition PUCCH is instructed to be transmitted, if at least one symbol among the symbols assigned to the repetition PUCCH overlaps with a DL symbol set in semi-static DL / UL allocation information (or default slot pattern), the terminal does not transmit the repetition PUCCH in the slot including the overlapping DL symbol and in subsequent slots.

[0268] (Method 3-3) - When repeated PUCCH overlaps with flexible symbols

[0269] In each slot in which a repetitive PUCCH is designated to be transmitted, at least one symbol of the symbols assigned to the repetitive PUCCH may overlap with a flexible symbol set by the semi-static DL / UL allocation. In this case, i) the terminal can determine whether to transmit the repetitive PUCCH based on the type (e.g., HARQ-ACK, RI, CSI, etc.) of information (i.e., UCI) transmitted by the repetitive PUCCH. ii) The terminal can determine whether to transmit the repetitive PUCCH based on signaling that triggers PUCCH transmission. iii) The terminal can determine whether to transmit the repetitive PUCCH based on dynamic slot configuration information. In this case, the repetitive PUCCH may be a first-type PUCCH or a second-type PUCCH.

[0270] The UE can determine whether to transmit the repetition PUCCH depending on the type of information (i.e., UCI) transmitted by the repetition PUCCH (HARQ-ACK, RI, CSI, etc.). For example, if the information transmitted by the repetition PUCCH includes a HARQ-ACK for a PDSCH scheduled by a PDCCH, the UE transmits the repetition PUCCH at a predetermined position regardless of the dynamic slot configuration information indicated by the group common PDCCH. Here, the predetermined position is indicated by the DCI scheduling the PDSCH. On the other hand, if the information transmitted by the repetition PUCCH does not include a HARQ-ACK for a PDSCH or includes a HARQ-ACK for a PDSCH configured by RRC, the UE transmits the repetition PUCCH when the flexible symbol overlapping with the repetition PUCCH is indicated as an UL symbol by the dynamic slot configuration information. As yet another example, in each slot instructed to transmit a repetition PUCCH, if at least one symbol among the symbols assigned to the repetition PUCCH is indicated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) by the dynamic slot configuration information, the terminal does not transmit the repetition PUCCH in that slot. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol assigned to the repetition PUCCH, the terminal does not transmit the repetition PUCCH in that slot. Even if the terminal is unable to transmit the repetition PUCCH in that slot, if a certain condition is met in the next slot (when the flexible symbol overlapping with the repetition PUCCH is indicated as a UL symbol by the dynamic slot configuration information), the terminal transmits the repetition PUCCH in the next slot.

[0271] If the UE is unable to transmit the repetitive PUCCH in any one of the slots instructed to transmit the repetitive PUCCH, the UE will not repeat the PUCCH in subsequent slots. In this case, examples of when the repetitive PUCCH cannot be transmitted include a symbol direction conflict caused by dynamic slot configuration information, or when the UE fails to receive dynamic slot configuration information.

[0272] When at least one symbol of the symbols to which the repetition PUCCH is assigned overlaps with a flexible symbol set by the semi-static DL / UL assignment, the UE can determine whether to transmit the repetition PUCCH according to the signaling that triggers the transmission of the repetition PUCCH. For example, when the repetition PUCCH is triggered by DCI, the UE transmits the repetition PUCCH at a predetermined position regardless of the dynamic slot configuration information. Here, the predetermined position is indicated by the DCI. On the other hand, when the repetition PUCCH is triggered by a UE-specific RRC message, the UE transmits the repetition PUCCH when the symbol to which the repetition PUCCH is assigned is indicated as an UL symbol by the dynamic slot configuration information.

[0273] In each slot instructed to transmit the repetition PUCCH, if at least one symbol among the symbols to which the repetition PUCCH is assigned is indicated as a symbol other than a UL symbol (e.g., a DL symbol or a flexible symbol) by the dynamic slot configuration information, the terminal does not transmit the repetition PUCCH in that slot. Alternatively, if the terminal fails to receive dynamic slot configuration information for the symbol to which the repetition PUCCH is assigned, the terminal does not transmit the repetition PUCCH in that slot. Even if the repetition PUCCH cannot be transmitted in that slot, the terminal transmits the repetition PUCCH in the next slot if a certain condition is met in the next slot. In this case, an example of the certain condition is when a flexible symbol overlapping with the repetition PUCCH is indicated as a UL symbol by the dynamic slot configuration information.

[0274] If the terminal does not transmit a repeat PUCCH in any of the slots instructed to transmit the repeat PUCCH for any reason (symbol direction inconsistency caused by dynamic slot configuration information, or the terminal fails to receive dynamic slot configuration information), the terminal will not repeat the transmission of the PUCCH in subsequent slots.

[0275] Here, the number K of slots in which PUCCH transmission is repeated (or attempted) may be set / defined as follows:

[0276] i) The K slots configured to transmit the repeated PUCCH do not necessarily have to be consecutive. For example, if a terminal is configured to repeatedly transmit the PUCCH for K slots, the PUCCH can be repeatedly transmitted until the count of the number of actually transmitted slots reaches K, in addition to the slots in which the repeated PUCCH was not transmitted.

[0277] ii) The K slots configured to transmit the repeated PUCCH must be consecutive. For example, if a terminal is configured to repeatedly transmit the PUCCH for K slots, the PUCCH can be repeatedly transmitted from slot N, in which the repeated PUCCH is instructed to be transmitted, until the count of the number of slots in which PUCCH transmission is attempted (including slots in which the repeated PUCCH is not transmitted) reaches K. That is, a terminal that first attempts PUCCH transmission in slot N attempts PUCCH transmission up to slot (N+K-1), and does not transmit any more PUCCH in slot (N+K) even if the number of times (or slots) in which the PUCCH is actually repeatedly transmitted is less than K.

[0278] iii) The terminal attempts to transmit PUCCH in up to K consecutive slots from slot N in which repetitive PUCCH transmission is instructed, excluding slots in which PUCCH cannot be transmitted due to semi-static DL / UL allocation information.

[0279] FIG. 16 is a diagram showing slots in which a repetitive PUCCH is transmitted according to the slot configuration.

[0280] 16(a) shows how a terminal transmits a first-type PUCCH 1500 when the terminal is configured to transmit the first-type PUCCH 1500 repeatedly over two slots (slot configuration based on semi-static DL / UL allocation). Here, the flexible symbol can be changed to a DL symbol or an UL symbol according to dynamic slot configuration information or scheduling information of a terminal-specific DCI. It is assumed that the symbols by which the first-type PUCCH 1500 is transmitted are symbols 8 to 13 within the slot. Here, one slot includes 14 symbols, and the symbol indices range from 0 to 13.

[0281] To explain the slot configuration with semi-static DL / UL allocation, in slot 0, symbol 0 is a DL symbol and symbols 7 to 13 are UL symbols. In slot 1, symbols 0 to 10 are DL symbols and symbols 12 to 13 are UL symbols. In slot 2, symbols 0 to 1 are DL symbols and symbols 10 to 13 are UL symbols. In slot 3, symbol 0 is a DL symbol and symbols 7 to 13 are UL symbols. The remaining symbols other than the UL and DL symbols are flexible symbols.

[0282] Therefore, the first type PUCCH 1500 may be transmitted in slot 0 and slot 3 regardless of the dynamic slot configuration information, but cannot be transmitted in slot 1 regardless of the dynamic slot configuration information, and can be transmitted in slot 2 if the dynamic slot configuration information indicates that symbols 8 and 9 are UL symbols, but cannot be transmitted otherwise.

[0283] 16(a) shows slots in which the UE attempts to transmit the first type PUCCH 1500 according to i) above. Here, it is assumed that symbols 8 and 9 in slot 2 are not designated as UL symbols by the dynamic slot configuration information, and the UE cannot transmit the first type PUCCH. The UE actually transmits the first type PUCCH 1500 twice, in slots 0 and 3. Therefore, the UE does not repeatedly transmit the first type PUCCH 1500 after slot 3.

[0284] 16(b) shows slots in which the terminal attempts to transmit the first type PUCCH 1500 using the above-mentioned ii). Since the terminal is configured to transmit the first type PUCCH 1500 repeatedly in two slots (K=2), the terminal attempts to transmit the first type PUCCH 1500 in slot 0 and slot 1. The terminal attempts to transmit the first type PUCCH in slot 1, but cannot transmit the first type PUCCH because it overlaps with a DL symbol due to the setting of semi-static DL / UL allocation information.

[0285] 16(c) shows the slots in which the first type PUCCH 1500 is attempted to be transmitted using the above-mentioned iii). The first type PUCCH 1500 is configured to be transmitted repeatedly in two slots (K=2), but slot 1 is a slot in which the first type PUCCH 1500 cannot be transmitted due to the semi-static DL / UL allocation information. Therefore, the terminal attempts to transmit the first type PUCCH 1500 in slots 0 and 2. Here, slot 2 may or may not actually transmit the first type PUCCH 1500, according to the instruction by the dynamic slot configuration information.

[0286] (Fourth Example)

[0287] The fourth embodiment relates to a method for transmitting physical channels by a terminal or a base station to improve physical channel coverage in a wireless communication system based on a slot configuration including a TDD-based DL symbol, a flexible symbol, and a UL symbol, and a determination procedure therefor. The physical channels transmitted by the terminal are uplink physical channels, including a PRACH, a PUCCH, a PUSCH, an SRS, etc. The physical channels transmitted by the base station are downlink physical channels, including a PDSCH, a PDCCH, a PBCH, etc. Hereinafter, this specification defines a procedure between a terminal and a base station for repeated transmission of a PUCCH, a procedure between a terminal and a base station for repeated transmission of a PUSCH, and a procedure between a terminal and a base station for repeated transmission of a PDSCH. The PUCCH or repeated PUCCH described below may be a first type PUCCH or a second type PUCCH.

[0288] (Method 1) - Resource determination procedure between terminal and base station for PUCCH repetitive transmission

[0289] The number of slots in which the PUCCH is transmitted or the number of repetitions of the PUCCH transmission may be any one of predetermined values ​​(e.g., 1, 2, 4, or 8), and the value to be set in the actual UE among these values ​​is transmitted by an RRC message. If the number of repetitions of the PUCCH transmission is set to 1, this indicates the transmission of a general PUCCH rather than a PUCCH that is repeatedly transmitted.

[0290] The starting point and length of a symbol in a slot in which the PUCCH is transmitted are included in information related to one PUCCH resource configured by the base station. In this case, the information related to the PUCCH resource may be configured by an RRC parameter. Also, a PUCCH resource set including at least one PUCCH resource may be configured or assigned to the terminal by RRC signaling. Meanwhile, the base station may indicate at least one PUCCH resource index of the PUCCH resource set to the terminal by dynamic signaling (e.g., DCI). For example, the base station may indicate the PUCCH resource index to the terminal based on a PUCCH resource indicator (PRI) included in the DCI or a combination of the PRI and an implicit mapping scheme. Here, the PRI may have a size of 2 or 3 bits.

[0291] The PUCCH resource set or PUCCH resource index configured in this manner may be maintained the same across multiple slots in which the PUCCH is repeatedly transmitted. The UE determines whether to transmit the PUCCH indicated by the DCI, which may be determined based on semi-static DL / UL allocation information. Such semi-static DL / UL allocation information may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that may be indicated by RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that may be further indicated to the UE by RRC signaling.

[0292] For example, i) the UL-DL configuration shared information indicates a period to which the semi-static DL / UL allocation information is applied, and may indicate the number of DL symbols, the number of UL symbols, and the number of flexible symbols configured across multiple slots included in the period. ii) The UL-DL configuration dedicated information includes information for replacing (overriding) flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. That is, the UE can replace flexible symbols in the slot format provided by the UL-DL configuration shared information with other types of symbols based on the UL-DL configuration dedicated information.

[0293] In each slot instructed by the base station to transmit a PUCCH, if the symbol in which the PUCCH is transmitted overlaps with a symbol instructed 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 instructed symbol. For example, if the symbol in the slot instructed by the base station is a DL symbol, the terminal postpones the transmission of the PUCCH to the next slot, and if one of the instructed symbols is a UL symbol or a flexible symbol, the terminal transmits the PUCCH in the slot. As another example, if the symbol in the slot instructed by the base station is a DL symbol or a flexible symbol, the terminal postpones the transmission of the PUCCH to the next slot, and if the instructed symbol is a UL symbol, the terminal transmits the PUCCH in the slot. The PUCCH not transmitted in the slot can be postponed to the next slot.

[0294] The UE repeatedly transmits the PUCCH on multiple slots until the number of repetitions of PUCCH transmission indicated / configured by the RRC message is reached. The UE can determine a slot for transmitting the PUCCH on multiple slots based on the UL symbols and unknown (or flexible) symbols according to the information transmitted in the RRC message. For example, the UE can determine a slot including the starting position of symbols for PUCCH transmission and the number of UL symbols as a slot resource for PUCCH transmission. In this case, the slot includes the UL symbols and flexible symbols configured by the RRC message. The base station can then receive the PUCCH repeatedly transmitted by the UE on multiple slots based on at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information.

[0295] If at least one symbol of the symbols for transmitting the PUCCH in the first slot among the slots assigned to repeated PUCCH transmission overlaps with a DL symbol, the terminal cancels the PUCCH transmission without transmitting the PUCCH in that slot. That is, if the symbols for transmitting the PUCCH in the first slot among the slots assigned to repeated PUCCH transmission are configured as UL symbols and flexible symbols, the terminal can transmit the PUCCH in that slot. Also, if at least one symbol of the symbols for transmitting the PUCCH after the first slot among the slots assigned to repeated PUCCH transmission overlaps with a DL symbol or a flexible symbol, the terminal cancels the PUCCH transmission without transmitting the PUCCH in that slot. That is, if the slot in which the base station instructs PUCCH transmission and the symbol of the slot instructs PUCCH transmission are configured as UL symbols among the slots assigned to repeated PUCCH transmission after the first slot, the terminal can transmit the PUCCH in that slot.

[0296] The following describes a PUCCH processing method related to gap symbols.

[0297] A gap for DL-UL switching may exist between DL symbols and UL symbols. The gap may be located in a flexible symbol. That is, some symbols of the flexible symbol between the DL symbols and UL symbols may be used for the DL-UL switching gap and may not be used for DL ​​reception or UL transmission. In this case, if the number of symbols for the gap is G, G may be fixed to a specific value such as 1 or 2, may be set / configured in the UE by an RRC message, or may be determined by a timing advance (TA) value.

[0298] In each slot instructed by the base station to transmit a PUCCH, if the symbol in which the PUCCH is transmitted overlaps with a symbol configured by semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUCCH based on the type (or direction) of the specified symbol. For example, if all the specified symbols are UL symbols, the terminal transmits the PUCCH. If at least one of the specified symbols is configured as a DL symbol or one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit the PUCCH in the slot. The terminal can postpone the PUCCH that is not transmitted in the slot to the next slot. In other words, if the symbol in which the PUCCH is transmitted is an UL symbol in a slot instructed by the base station to transmit a PUCCH, the terminal transmits the PUCCH. If the symbol in which the PUCCH is transmitted overlaps with a DL symbol or at least one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit the PUCCH in the slot. The UE can postpone the PUCCH that was not transmitted in the slot to the next slot. That is, if the DL symbol overlaps with any one of the G symbols that can be used as a gap, the PUCCH is not transmitted and its transmission is postponed to the next slot.

[0299] Meanwhile, in relation to the PUCCH processing method in multiple slots, the UE repeatedly transmits the PUCCH on multiple slots until the number of repetitions of PUCCH transmission set / configured by the RRC message is reached. The UE can determine the slot for transmitting the PUCCH on multiple slots based on the type and number of symbols according to the information transmitted in the RRC message.

[0300] The UE determines a slot for PUCCH transmission based on the number of UL symbols, the number of flexible symbols, and the number of gap symbols set / configured by the semi-static UL / DL allocation information. For example, if "the number of UL symbols + the number of flexible symbols - the number of gap symbols" in a slot includes the PUCCH transmission start symbol position and the number of UL symbols through which the PUCCH is transmitted, the UE can determine the slot as a slot for PUCCH transmission and transmit the PUCCH. Alternatively, since one slot includes 14 symbols, if "14 - (the number of DL symbols in the slot + the number of gap symbols)" includes the PUCCH transmission start symbol position and the number of UL symbols through which the PUCCH is transmitted, the UE can determine the slot as a slot for PUCCH transmission and transmit the PUCCH.

[0301] In this case, the base station can receive the PUCCH repeatedly transmitted by the terminal in multiple slots based on at least one of the UL-DL configuration common information and the UL-DL configuration dedicated information.

[0302] FIG. 17 shows whether or not PUCCH transmission occurs depending on the slot configuration.

[0303] Referring to FIG. 17, the slot configuration configured according to the semi-static DL / UL allocation information includes, in sequence, 5 DL symbols (denoted as 'D'), 3 flexible symbols (denoted as 'X'), and 6 UL symbols (denoted as 'U').

[0304] PUCCH allocation #0 is set to have the 8th symbol through the 14th symbol as the resource for PUCCH transmission, PUCCH allocation #1 is set to have the 7th symbol through the 14th symbol as the resource for PUCCH transmission, and PUCCH allocation #3 is set to have the 6th symbol through the 14th symbol as the resource for PUCCH transmission.

[0305] Figure 17(a) shows the case where the gap is 1 symbol (G=1). When G=1, PUCCH allocation #0 and PUCCH allocation #1, which do not include one flexible symbol immediately after the DL symbol, can be transmitted, but PUCCH allocation #2, which includes one flexible symbol immediately after the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocation #2 may be postponed to the next slot. Of course, the terminal uses the same criteria to determine whether PUCCH allocation #2 can be transmitted in the next slot.

[0306] Figure 17(b) shows the case where the gap is 2 symbols (G=2). When G=2, PUCCH allocation #0, which does not include two consecutive or flexible symbols immediately following the DL symbol, can be transmitted, but PUCCH allocation #1 and PUCCH allocation #2, which include two consecutive flexible symbols immediately following the DL symbol, cannot be transmitted. In this case, the transmission of PUCCH allocations #1 and #2 may be postponed to the next slot. Of course, the terminal also uses the same criteria to determine whether PUCCH allocations #1 and #2 can be transmitted in the next slot.

[0307] (Method 2) - Resource determination procedure between terminal and base station for PUSCH repetitive transmission

[0308] The number of slots in which the PUSCH is transmitted or the number of repetitions of the PUCCH transmission may be any one of predetermined values ​​(e.g., 1, 2, 4, or 8), and the value actually set in the UE among these values ​​is transmitted by an RRC message. If the number of repetitions of the PUSCH transmission is set to 1, it means a general PUSCH, not a repeatedly transmitted PUSCH.

[0309] In the case of PUSCH transmission, PUSCH transmission is performed only in a slot configuration suitable for PUSCH transmission among K consecutive slots, and a postponing operation of PUSCH transmission is not performed.

[0310] The start symbol and length (transmission duration) for transmitting the PUSCH within a slot are indicated by the DCI and may be maintained the same for all slots. The UE determines whether to transmit the PUSCH indicated by the DCI. At this time, the UE may determine whether to transmit the PUSCH based on semi-static DL / UL allocation information. The semi-static DL / UL allocation information used to determine whether to transmit the PUSCH may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that may be indicated by RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that may be indicated to the UE by RRC signaling. For example, the UL-DL configuration common information may indicate a period for applying the semi-static UL / DL allocation information. The UL-DL configuration common information may be used to set the number of UL / DL symbols per slot configured across multiple slots included in the period, a slot format consisting of the number of UL / DL symbols per slot and the number of flexible symbols per slot, and the number of slots. That is, the UE can configure a slot format for each slot using the number of slots indicated by the UL-DL configuration shared information. As another example, the UL-DL configuration-specific information may include information for overriding flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. That is, the UE can replace 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.

[0311] In each slot instructed by the base station to transmit a PUSCH, if the symbol in which the PUSCH is transmitted overlaps with a symbol instructed by semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal determines whether to transmit the PUSCH based on the type (or direction) of the instructed symbol. For example, if at least one symbol among the instructed symbols is a DL symbol, the terminal does not transmit the PUSCH and cancels the PUSCH transmission. Also, if the instructed symbols are UL symbols and flexible symbols, the terminal transmits the PUSCH in the slot. As another example, if at least one symbol among the instructed symbols is a DL symbol or a flexible symbol, the terminal does not transmit the PUSCH and cancels the PUSCH transmission. Also, if the instructed symbol is a UL symbol, the terminal transmits the PUSCH in the slot.

[0312] If at least one symbol among the symbols for transmitting the PUSCH in the first slot among the slots for which repeated PUSCH transmission is instructed overlaps with a DL symbol, the UE does not transmit the PUSCH in the slot and cancels the PUSCH transmission. That is, if the symbols for transmitting the PUSCH in the first slot among the slots for which repeated PUSCH transmission is instructed are configured as UL symbols and flexible symbols, the UE can transmit the PUSCH in the slot. Also, if at least one symbol among the symbols for transmitting the PUSCH in slots after the first slot among the slots for which repeated PUSCH transmission is instructed overlaps with a DL symbol or a flexible symbol, the UE does not transmit the PUSCH in the slot and cancels the PUSCH transmission. That is, if the symbols set / instructed to transmit the PUSCH in slots after the first slot among the slots for which repeated PUSCH transmission is instructed are configured as UL symbols, the UE can transmit the PUSCH in the slot.

[0313] A PUSCH processing method related to gap symbols will be described below.

[0314] A gap for DL-UL switching may exist between DL symbols and UL symbols. The gap may be located in flexible symbols. Some of the flexible symbols between DL symbols and UL symbols may be used for the DL-UL switching gap and are not used for DL ​​reception or UL transmission. If the number of symbols for the gap is G, G may be fixed to a specific value such as 1 or 2, may be configured in the UE by an RRC message, or may be determined by a timing advance (TA) value.

[0315] In each slot instructed by the base station to transmit a PUSCH, if a symbol in which the PUSCH is transmitted overlaps with a symbol instructed by semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information), the terminal can determine whether to transmit the PUSCH based on the type (or direction) of the instructed symbol. For example, if all the instructed symbols are UL symbols, the terminal transmits the PUSCH, and if at least one of the instructed symbols is a DL symbol or one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit the PUSCH in the slot. That is, in each slot instructed by the base station to transmit a PUSCH, if a symbol in which the PUSCH is transmitted is an UL symbol, the terminal transmits the PUSCH, and if at least one symbol in which the PUSCH is transmitted overlaps with a DL symbol or at least one of G consecutive flexible symbols immediately following a DL symbol, the terminal does not transmit the PUSCH and cancels the PUSCH transmission. That is, if the PUSCH overlaps with the DL symbol and any one of the G symbols that can be used as a gap, the PUSCH is not transmitted and the transmission of the PUSCH is canceled.

[0316] (Method 3) - Resource determination procedure between terminal and base station for PDSCH repetitive reception

[0317] The number of slots in which the PDSCH is received or the number of repetitions of PDSCH reception may be any one of predetermined values ​​(e.g., 1, 2, 4, 8), and the value actually set in the UE among these values ​​is transmitted by an RRC message. If the number of repetitions of PDSCH reception is set to 1, it means a general PDSCH, not a repeatedly transmitted PDSCH.

[0318] The start symbol and symbol duration (length) of the symbols in which the PDSCH is received within a slot may be indicated by DCI and may be maintained the same for all slots. The UE determines whether to receive the PDSCH indicated by the DCI. This determination may be made based on semi-static DL / UL allocation information. The semi-static DL / UL allocation information used for this determination may include at least one of UL-DL configuration common information (TDD-UL-DL-ConfigurationCommon) that may be indicated by RRC signaling and UL-DL configuration dedicated information (TDD-UL-DL-ConfigDedicated) that may be indicated to the UE by RRC signaling. For example, the UL-DL configuration common information may indicate a period in which the semi-static DL / UL allocation information is applied. The UL-DL configuration common information may be used to set the number of UL / DL symbols per slot configured across multiple slots included in the period, a slot format consisting of the number of UL / DL symbols per slot and the number of flexible symbols per slot, and the number of slots. That is, the UE can configure a slot format for each slot using the number of slots indicated by the UL-DL configuration shared information. As another example, the UL-DL configuration-specific information may include information for overriding flexible symbols in the semi-static DL / UL slot configuration provided by the UL-DL configuration shared information with UL symbols, DL symbols, and flexible symbols. That is, the UE can replace 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.

[0319] If the symbol at which the terminal receives the PDSCH overlaps with a symbol indicated by semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information) within a slot instructed by the base station to receive the PDSCH, the terminal can determine whether to receive the PDSCH based on the type (or direction) of the indicated symbol. For example, if at least one of the indicated symbols is a UL symbol, the terminal does not receive the PDSCH. On the other hand, if the indicated symbols are DL symbols and flexible symbols, the terminal can receive the PDSCH in the slot. As another example, if at least one of the indicated symbols is a UL symbol or an Unknown (or flexible symbol), the terminal does not receive the PDSCH. On the other hand, if the indicated symbol is a DL symbol, the terminal receives the PDSCH in the slot.

[0320] If at least one symbol of the symbols at which the PDSCH is received in the first slot among the slots for which repeated PDSCH reception is instructed overlaps with an UL symbol, the terminal does not receive the PDSCH in that slot. That is, if the symbol at which the PDSCH is received in the first slot among the slots for which repeated PDSCH reception is instructed is configured as a DL symbol and a flexible symbol, the terminal can receive the PDSCH in that slot. Also, if at least one symbol of the symbols at which the PDSCH is received in slots after the first slot among the slots for which repeated PDSCH reception is instructed overlaps with an UL symbol or a flexible symbol, the terminal does not receive the PDSCH in that slot. That is, if the slot for which PDSCH reception is instructed by the base station and the symbol at which the PDSCH is instructed to be received in that slot are configured as DL symbols among the slots for which repeated PDSCH reception is instructed after the first slot, the terminal can receive the PDSCH in that slot. Meanwhile, the terminal can further receive the PDSCH that was not received in the next postponed slot.

[0321] A PDSCH processing method related to gap symbols will be described below.

[0322] A gap for DL-UL switching may exist between DL symbols and UL symbols. The gap may be located in flexible symbols. Some of the flexible symbols between DL symbols and UL symbols may be used for the DL-UL switching gap and are not used for DL ​​reception or UL transmission. If the number of symbols for the gap is G, G may be fixed to a specific value such as 1 or 2, may be configured in the UE by an RRC message, or may be determined by a timing advance (TA) value.

[0323] If the symbol in which the PDSCH is received overlaps with a symbol instructed by the semi-static UL / DL allocation information (at least one of UL-DL configuration common information and UL-DL configuration dedicated information) in a slot instructed by the base station to receive the PDSCH, the terminal determines whether to receive the PDSCH based on the type (or direction) of the instructed symbol. For example, if all the instructed symbols are DL symbols, the terminal receives the PDSCH, and if at least one of the instructed symbols is an UL symbol or one of G consecutive flexible symbols immediately before an UL symbol, the terminal does not receive the PDSCH.

[0324] That is, if the symbol at which the PDSCH is received is a DL symbol within a slot instructed by the base station to receive the PDSCH, the terminal receives the PDSCH. However, if the symbol at which the PDSCH is received overlaps with an UL symbol or at least one of G consecutive flexible symbols before the UL symbol, the terminal does not receive the PDSCH. That is, if the symbol at which the PDSCH is transmitted overlaps with an UL symbol or one of G symbols that can be used as a gap, the base station does not transmit the PDSCH and cancels the transmission of the PDSCH. Then, the base station postpones the transmission of the PDSCH to the next slot.

[0325] On the other hand, if the terminal cancels the reception of the PDSCH due to the semi-static DL / UL allocation information, the HARQ-ARQ timing may be changed, and therefore a new HARQ-ARQ timing configuration method needs to be defined.

[0326] When reception of a PDSCH is canceled, the new HARQ-ARQ timing is not canceled and can be determined by the received PDSCH. That is, to determine the slot in which the HARQ-ACK is actually transmitted, the UE can use the HARQ-ACK timing included in the DCI instructing PDSCH reception and the last received PDSCH excluding the canceled PDSCH. For example, a UE instructed to receive four slots as the HARQ-ACK timing can transmit the HARQ-ACK four slots after the slot in which the last PDSCH was received.

[0327] Even when reception of the PDSCH is canceled, the HARQ-ACK timing is not changed and can be determined assuming that the PDSCH is received. That is, to determine the slot in which the HARQ-ACK is actually transmitted, the UE can use the HARQ-ACK timing included in the DCI instructing reception of the PDSCH and the last PDSCH before determining whether to cancel. For example, a UE instructed to receive 4 slots as the HARQ-ACK timing can transmit the HARQ-ACK 4 slots after the last slot of the assigned PDSCH even if reception of the PDSCH is canceled.

[0328] Meanwhile, a terminal may be configured to perform inter-slot frequency hopping for frequency diversity. Therefore, even when a terminal repeatedly transmits a PUCCH (or a PDSCH or a PUSCH) in multiple slots, a method for the terminal to perform inter-slot frequency hopping needs to be defined. Hereinafter, this specification will describe which physical resource block (PRB) in each slot to transmit a PUCCH (or a PDSCH or a PUSCH) in during inter-slot frequency hopping. This specification will also describe an algorithm for determining a PRB based on the difference between the slot in which the PUCCH is initially transmitted and the current slot, regardless of the number of times the PUCCH is repeatedly transmitted.

[0329] In the inter-slot frequency hopping method when transmitting a PUCCH, a terminal can determine an RB (resource block) for transmitting a PUCCH based on the index of the first slot and the index of the second slot in which a repeated PUCCH is first transmitted. Here, the first slot is a slot in which PUCCH transmission is instructed by a base station, and the second slot is a slot in which a PUCCH is transmitted after the first slot during repeated PUCCH transmission. Here, slot n s The RB or starting RB index of the RBs on which the PUCCH is transmitted may be obtained by Equation 1 below.

[0330]

number

[0331] In Equation 1, RB1 and RB2 are the starting RB indexes of the first hop and the second hop, respectively, which are signaled to the terminal in an RRC message and set / configured in the terminal. s,0 is the index of the slot in which the PUCCH is first transmitted. This scheme allows the PUCCH to be transmitted over only one hop during repeated transmission by postponing the repeated PUCCH.

[0332] In the inter-slot frequency hopping method when transmitting a PUCCH, the UE can hop every time it actually transmits a repeated PUCCH. The RB may be determined by the slot index in which the PUCCH is transmitted and the actual number of repetitions. More specifically, in slot n s The RB or starting RB index of the RBs on which the PUCCH is transmitted may be obtained by Equation 2:

[0333]

number

[0334] In Equation 2, RB1 and RB2 are the starting RB indexes of the first hop and the second hop, respectively, which are signaled to the terminal in the RRC message and set / configured in the terminal. repeat (n s ) is slot n s This is the number of times the PUCCH has been repeatedly transmitted up to now. In this manner, the PUCCH may be transmitted via two different hops regardless of the postponement of the repeated PUCCH.

[0335] (Fifth Example)

[0336] In the fifth embodiment, in order to improve the coverage of the PUCCH, a method and a determination procedure for repeatedly transmitting the PUCCH across multiple slots, as well as a method for determining which slot among multiple slots to use for PUCCH repeated transmission, will be described. Specifically, a method for a terminal to determine which slot among multiple slots to use for PUCCH transmission will be described.

[0337] The UE may determine a slot for PUCCH transmission based on an SS / PBCH block including a synchronization signal for radio resource management (RRM) measurement and information about initial cell access. The SS / PBCH block may be transmitted at a predetermined position, and a configuration for transmitting the SS / PBCH block may be transmitted from the base station to the UE via an RRC message (e.g., SSB_transmitted-SIB1 information or SSB_transmitted) and configured in the UE. Flexible symbols capable of transmitting the SS / PBCH block may exist in the slot indicated by the configuration for transmitting the SS / PBCH block. That is, the flexible symbols may be used not only for PUCCH transmission but also for transmitting the SS / PBCH block including information about synchronization and initial cell access. In this case, a flexible symbol for transmitting the SS / PBCH block and / or a flexible symbol capable of PUCCH transmission may overlap. For example, the UE may determine a slot for repeated PUCCH transmission by excluding slots including the overlapping symbols from slots for repeated PUCCH transmission, thereby preventing collision. In this way, if the terminal determines a number of slots to transmit the PUCCH based on SSB_transmitted-SIB1 and SSB_transmitted and repeatedly transmits the PUCCH over the number of slots, the base station can receive the repeated PUCCH from the terminal.

[0338] The terminal can determine the slot for PUCCH transmission based on the semi-static DL / UL allocation information and the gap.

[0339] In this specification, the gap is assumed to be located at the symbol immediately preceding the symbol for PUCCH transmission and to include one or two symbols. However, the location and number of symbols of the DL-UL switching gap between DL and UL may be variously configured according to the settings of the base station and the terminal. For example, the gap may include two or more symbols, and the terminal may determine a slot for PUCCH transmission or decide whether to postpone PUCCH transmission by taking into account two or more gap symbols.

[0340] Meanwhile, the slot determination may be based on at least one of whether a PDSCH is allocated in the slot, whether a control resource set (CORESET) for PDCCH monitoring is allocated to a DL symbol in the slot, whether a CSI-RS is allocated in the slot, whether an SS / PBCH block is allocated in the slot, and semi-static DL / UL allocation information. For example, if the symbol immediately preceding a flexible symbol is a DL symbol and a PDSCH is allocated to the DL symbol, the UE does not consider the flexible symbol as a resource for PUCCH transmission. Instead, the UE may determine a slot including other UL symbols and flexible symbols as a slot for PUCCH transmission. If the symbol immediately preceding a flexible symbol is a DL symbol and no PDSCH is allocated to the DL symbol, the flexible symbol becomes an unassigned symbol. Therefore, the UE does not recognize the unassigned symbol as a gap for DL-UL switching. The UE may then consider the flexible symbol immediately following the DL symbol as a resource capable of repeated PUCCH transmission and determine it as a slot for PUCCH transmission. As yet another example, if the symbol immediately preceding a flexible symbol is a DL symbol and a CORESET or search space for PDCCH monitoring is assigned to the DL symbol, the terminal may exclude a slot including the flexible symbol from slots for repeated PUCCH transmission in order to monitor the assigned PDCCH. As yet another example, if the symbol immediately preceding a flexible symbol is a DL symbol and a CORESET or search space for PDCCH monitoring is assigned to the DL symbol, the terminal may not monitor the assigned PDCCH, but may consider the flexible symbol as a resource available for repeated PUCCH transmission and determine it as a slot for PUCCH transmission.

[0341] As yet another example, the terminal may determine a slot for PUCCH transmission using semi-static DL / UL allocation information. The terminal may recognize a slot and a symbol for PUCCH transmission through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUCCH transmission is indicated overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information and the symbol immediately preceding the symbol for which PUCCH transmission is indicated is not a DL symbol indicated by the semi-static DL / UL allocation information, the terminal may determine the slot as a slot for repeated PUCCH transmission and transmit the PUCCH in the slot. On the other hand, if the symbol immediately preceding the symbol for which PUCCH transmission is indicated is a DL symbol indicated by the semi-static DL / UL allocation information, the terminal may not transmit the repeated PUCCH in the slot and may postpone PUCCH transmission to the next available slot. In other words, the UE can recognize the symbols for transmitting the PUCCH in each slot using an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or if the symbol immediately before the symbol for transmitting the PUCCH is a DL symbol of the semi-static DL / UL allocation information, the UE does not transmit the PUCCH in that slot; otherwise, the UE transmits the PUCCH in that slot. This is because a switching gap between DL and UL may be necessary. In this case, the PUCCH that could not be transmitted may be postponed to be transmitted in the next available slot.

[0342] As yet another example, the terminal can determine a slot for PUCCH transmission using scheduling information from the base station. The terminal can recognize the slot and symbol for PUCCH transmission using an RRC message and dynamic signaling (e.g., PRI). If at least one symbol of the symbols for which PUCCH transmission is instructed overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and a PDSCH is not scheduled in the symbol immediately preceding the symbol for which PUCCH transmission is instructed, the terminal can determine the slot as the slot for PUCCH transmission and transmit the PUCCH in the slot. On the other hand, if a PDSCH is scheduled in the symbol immediately preceding the symbol for which PUCCH transmission is instructed, the terminal does not transmit the PUCCH in the slot and can postpone PUCCH transmission to the next available slot. In other words, the terminal can recognize the symbol for which PUCCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol in the semi-static DL / UL allocation information, or if a PDSCH is scheduled for the symbol immediately before the symbol for which PUCCH transmission is instructed, the terminal does not transmit the PUCCH in that slot. Otherwise, the terminal can transmit the PUCCH in that slot. This is because a switching gap between DL and UL may be required. The PUCCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0343] As yet another example, the terminal can determine a slot for PUCCH transmission using CSI-RS information set / configured by the base station. The terminal can recognize which symbol in which slot the PUCCH should be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols for which PUCCH transmission is instructed overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information and CSI-RS reception is not configured for the symbol immediately preceding the symbol for which PUCCH transmission is instructed, the terminal can determine the slot as the slot for PUCCH transmission and transmit the PUCCH in the slot. On the other hand, if CSI-RS reception is configured for the symbol immediately preceding the symbol for which PUCCH transmission is instructed, the terminal can postpone PUCCH transmission to the next available slot without transmitting the PUCCH in the slot. In other words, the terminal can recognize which symbol in each slot the PUCCH should be transmitted from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if CSI-RS reception is configured for the symbol immediately before the symbol instructed to transmit the PUCCH, the UE does not transmit the PUCCH in that slot. Otherwise, the UE can transmit the PUCCH in that slot. This is because a switching gap between DL and UL may be required. The PUCCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

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

[0345] As yet another example, the terminal can recognize the slot and symbol in which the PUCCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). It may be the case that at least one of the symbols for which PUCCH transmission is instructed overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information, and the symbol immediately preceding the symbol for which PUCCH transmission is instructed does not overlap with an SS / PBCH block. In this case, the terminal can determine the slot as the slot for PUCCH transmission and transmit the PUCCH in the slot. On the other hand, if the symbol immediately preceding the symbol for which PUCCH transmission is instructed overlaps with an SS / PBCH block, the terminal does not transmit the PUCCH in the slot and can postpone PUCCH transmission to the next available slot. In other words, the terminal can recognize the symbol in which the PUCCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). In this case, if at least one of the symbols overlaps with a DL symbol of semi-static DL / UL allocation information, or if the symbol immediately before the symbol instructed to transmit a PUCCH overlaps with an SS / PBCH block, the terminal does not transmit the PUCCH in that slot. Otherwise, the terminal can transmit the PUCCH in that slot. This is because a switching gap between DL and UL may be required. The PUCCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0346] In this specification, when describing whether to transmit and postpone PUCCH, we have mainly mentioned at least one symbol when considering the symbol immediately preceding the symbol for PUCCH transmission. However, since the switching gap between DL and UL may be set / applied in various ways depending on the settings of the base station and the terminal, it goes without saying that the number of gap symbols is not limited to one symbol and can be set / applied to various symbols.

[0347] In one slot, a symbol designated as a DL symbol by dynamic signaling (e.g., SFI) may end at the symbol immediately preceding the symbol for the repeated PUCCH transmission, and the PUCCH resource may be configured so that transmission for the repeated PUCCH begins from the next symbol. In this case, the UE may not transmit the PUCCH in that slot, but may postpone it to a later slot, and the postponed slot may be the first slot among the slots in which the PUCCH may be transmitted.

[0348] A method in which a UE determines a slot for PUCCH transmission depending on whether a PDSCH is allocated within a slot will be described with a more specific example. Here, it is assumed that one slot includes 14 symbols.

[0349] For example, assume that the UL symbol resource for the PUCCH is configured as the last 12 symbols of a slot, and a specific slot sequentially includes two DL symbols, two flexible symbols, and ten UL symbols. If the PDSCH is allocated to the two DL symbols immediately preceding the two flexible symbols, the UE implicitly regards the first flexible symbol as a DL-UL switching gap. The UE then determines whether it can configure the remaining one flexible symbol and 10 UL symbols other than the first flexible symbol as resources for PUCCH transmission. However, since the UL symbol resource for the PUCCH is configured as the last 12 symbols of the slot, the UE can exclude the slot from slot resources for PUCCH transmission (because the UL symbols (including the flexible symbols) available for PUCCH transmission are the last 11). In the above example, if the UL symbol resource for the PUCCH is configured as the last 11 symbols of the slot, the UE can determine the slot as a slot resource for PUCCH transmission.

[0350] As another example, assume that the UL symbol resource for the PUCCH is configured as the last six symbols of a slot, and that a specific slot sequentially includes eight DL symbols, two flexible symbols, and four UL symbols. If the PDSCH is allocated to the first eight DL symbols, the UE implicitly considers the first flexible symbol as a DL-UL switching gap. The UE then determines whether it can configure the remaining one flexible symbol and four UL symbols other than the first flexible symbol as PUCCH resources. However, since the UL symbol resource for the PUCCH is configured as the last six symbols of the slot, the UE can exclude the slot from slot resources for PUCCH transmission (because the UL symbols (including flexible symbols) available for PUCCH transmission are the last five). In the above example, if the UL symbol resource for the PUCCH is configured as the last five symbols of the slot, the UE can determine the slot as a slot resource for PUCCH transmission.

[0351] (Sixth Example)

[0352] The sixth embodiment relates to a method and a procedure for repeatedly transmitting a PUSCH over a plurality of slots in order to improve the coverage of the PUSCH, as well as a method for determining in which slots of a plurality of slots the PUSCH is to be repeatedly transmitted.

[0353] The slot for transmitting the PUSCH may be determined based on at least one of whether a PDSCH is allocated in the slot, whether a control resource set (CORESET) for PDCCH monitoring is allocated to a DL symbol in the slot, whether a CSI-RS is allocated in the slot, whether an SS / PBCH block is allocated in the slot, and semi-static DL / UL allocation information. For example, the UE can determine the slot for transmitting the PUSCH using the semi-static DL / UL allocation information. The UE can recognize the slot and symbol for transmitting the PUSCH from an RRC message and dynamic signaling (e.g., PRI). If the symbol for which PUSCH transmission is indicated overlaps with the flexible symbol indicated by the semi-static DL / UL allocation information and the symbol immediately before the symbol for which PUSCH transmission is indicated is not a DL symbol indicated by the semi-static DL / UL allocation information, the UE can determine the slot as the slot for PUSCH transmission and transmit the PUSCH in the slot. On the other hand, if the symbol immediately before the symbol for which PUSCH transmission is indicated is a DL symbol indicated by the semi-static DL / UL allocation information, the UE does not transmit the PUSCH in that slot and can postpone PUSCH transmission to the next available slot. In other words, the UE can recognize the symbols for transmitting the PUSCH in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol in the semi-static DL / UL allocation information or if the symbol immediately before the symbol for transmitting the PUSCH is a DL symbol in the semi-static DL / UL allocation information, the UE does not transmit the PUSCH in that slot; otherwise, the UE transmits the PUSCH in that slot. This is because a switching gap between DL and UL may be required. The PUSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0354] As yet another example, the terminal can determine a slot for PUSCH transmission using information scheduled for the terminal. The terminal can recognize the slot and symbol in which the PUSCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to transmit the PUSCH overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and a PDSCH is not scheduled in the symbol immediately preceding the symbol instructed to transmit the PUSCH, the terminal can determine the slot as a slot for PUSCH transmission and transmit the PUSCH in the slot. On the other hand, if a PDSCH is scheduled in the symbol immediately preceding the symbol instructed to transmit the PUSCH, the terminal can postpone PUSCH transmission in the slot and postpone PUSCH transmission to the next available slot. In other words, the terminal can recognize the symbol in which the PUSCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or if a PDSCH is scheduled for the symbol immediately before the symbol in which the PUSCH is transmitted, the UE does not transmit the PUSCH in that slot. Otherwise, the UE transmits the PUSCH in that slot. This is because a switching gap between DL and UL may be required. The PUSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0355] As another example, the terminal may determine a slot for PUSCH transmission using CSI-RS information set / configured by the base station. The terminal may know which slot and which symbol the PUSCH should be transmitted in through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols for which PUSCH transmission is instructed overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and CSI-RS reception is not configured for the symbol immediately preceding the symbol for which PUSCH transmission is instructed, the terminal may determine the slot as a slot for PUSCH transmission and transmit the PUSCH in the slot. On the other hand, if CSI-RS reception is configured for the symbol immediately preceding the symbol for which PUSCH transmission is instructed, the terminal does not transmit the PUSCH in the slot. In other words, the terminal may know which symbol the PUSCH should be transmitted in each slot through an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of semi-static DL / UL allocation information or if CSI-RS reception is configured for the symbol immediately preceding the symbol in which the PUSCH is transmitted, the UE does not transmit the PUSCH in that slot; otherwise, the UE transmits the PUSCH in that slot. This is because a switching gap between DL and UL may be required. The PUSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0356] As another example, the terminal may determine a slot for PUSCH transmission using PDCCH monitoring information set / configured by the base station. The terminal may recognize the slot and symbol in which the PUSCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to transmit the PUSCH overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and PDCCH monitoring is not configured (or assigned) for the symbol immediately preceding the symbol instructed to transmit the PUSCH, the terminal may determine the slot as a slot for PUSCH transmission and transmit the PUSCH in the slot. On the other hand, if PDCCH monitoring is configured (or assigned) for the symbol immediately preceding the symbol instructed to transmit the PUSCH, the terminal does not transmit the PUSCH in the slot. In other words, the terminal may recognize the symbol in which the PUSCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of the semi-static DL / UL allocation information or PDCCH monitoring is configured for the symbol immediately before the symbol in which the PUSCH is transmitted, the UE does not transmit the PUSCH in that slot; otherwise, the UE transmits the PUSCH in that slot. This is because a switching gap between DL and UL may be required. The PUSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0357] As yet another example, the terminal can recognize the slot and symbol in which the PUSCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to transmit the PUSCH overlaps with the flexible symbol instructed by the semi-static DL / UL allocation information and the symbol immediately preceding the symbol instructed to transmit the PUSCH does not overlap with the SS / PBCH block, the terminal determines the slot as the slot for PUSCH transmission and can transmit the PUSCH in the slot. On the other hand, if the symbol immediately preceding the symbol instructed to transmit the PUSCH overlaps with the SS / PBCH block, the terminal does not transmit the PUSCH in the slot. In other words, the terminal can recognize the symbol in which the PUSCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of semi-static DL / UL allocation information, or if the symbol immediately preceding the symbol in which the PUSCH is transmitted overlaps with an SS / PBCH block, the UE does not transmit the PUSCH in that slot. Otherwise, the UE transmits the PUSCH in that slot. This is because a switching gap between DL and UL may be required. The PUSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0358] In the present invention, when explaining the transmission and postponement of a PUSCH, the description has been given mainly by taking into consideration at least one symbol when considering the symbol immediately before the symbol for PUSCH transmission. However, since the DL-UL switching gap may be set in various ways depending on the settings of the base station and the terminal, it is of course possible to determine whether to transmit and postpone a PUSCH by taking into consideration one or more symbols.

[0359] (Seventh Example)

[0360] The seventh embodiment relates to a method and a decision procedure for repeatedly transmitting a PDSCH over a plurality of slots in order to improve the coverage of the PDSCH, as well as a method for deciding in which slot of a plurality of slots the PDSCH is to be repeatedly transmitted.

[0361] The slot for receiving the PDSCH may be determined based on at least one of whether a PUSCH is allocated within the slot, whether a PUCCH is allocated, whether an SRS transmission is allocated, whether a PRACH transmission is allocated, and semi-static DL / UL allocation information.

[0362] For example, the terminal can determine the slot in which to receive the PDSCH using semi-static DL / UL allocation information. The terminal can recognize the slot and symbol in which the PDSCH must be received by an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to receive the PDSCH overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and the symbol immediately following the symbol instructed to receive the PDSCH is not an UL symbol instructed by the semi-static DL / UL allocation information, the terminal can determine the slot as a slot for PDSCH reception and receive the PDSCH in the slot. On the other hand, if the symbol immediately following the symbol instructed to receive the PDSCH is an UL symbol instructed by the semi-static DL / UL allocation information, the terminal does not receive the PDSCH in the slot. In other words, the terminal can recognize the symbol in which the PDSCH is to be received in each slot by an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a UL symbol of semi-static DL / UL allocation information, or if the symbol immediately following the symbol transmitting the PDSCH is a UL symbol of semi-static DL / UL allocation information, the terminal does not receive the PDSCH in the slot; otherwise, the terminal receives the PDSCH in the slot.

[0363] As another example, the terminal may determine a slot for PDSCH reception using uplink information (PUSCH, PUCCH, PRACH, SRS, etc.) scheduled by the base station. The terminal may recognize the slot and symbol in which the PDSCH must be received through an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols for which PDSCH reception is indicated overlaps with a flexible symbol indicated by the semi-static DL / UL allocation information and a PUSCH, PUCCH, PRACH, or SRS is not scheduled in the symbol immediately following the symbol for which PDSCH reception is indicated, the terminal may determine the slot as a slot for PDSCH reception and receive the PDSCH in the slot. On the other hand, if a PUSCH, PUCCH, PRACH, or SRS is scheduled in the symbol immediately following the symbol for which PDSCH reception is indicated, the terminal does not receive the PDSCH in the slot. In other words, the terminal can recognize the symbol in each slot in which the PDSCH is received from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with an UL symbol of semi-static DL / UL allocation information, or if a PUSCH, PUCCH, PRACH, or SRS is scheduled in the symbol immediately following the symbol in which the PDSCH is transmitted, the terminal does not receive the PDSCH in the slot; otherwise, the terminal receives the PDSCH in the slot. Here, the PUCCH may be a PUCCH that transmits a HARQ-ACK. Alternatively, the PUCCH may be a PUCCH that transmits a scheduling request (SR).

[0364] As yet another example, the terminal can determine a slot for PDSCH transmission using CSI-RS information set / configured by the base station. The terminal can recognize the slot and symbol in which the PDSCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to receive the PDSCH overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and CSI-RS reception is not configured in the symbol immediately preceding the symbol instructed to receive the PDSCH, the terminal can determine the slot as a slot for PDSCH transmission and transmit the PDSCH in the slot. On the other hand, if CSI-RS reception is configured in the symbol immediately preceding the symbol instructed to receive the PDSCH, the terminal can not transmit the PDSCH in the slot and postpone PDSCH transmission to the next available slot. In other words, the terminal can recognize the symbol in which the PDSCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of semi-static DL / UL allocation information or if CSI-RS reception is configured for the symbol immediately preceding the symbol in which the PDSCH is transmitted, the UE does not transmit the PDSCH in that slot. Otherwise, the UE transmits the PDSCH in that slot. This is because a switching gap between DL and UL may be required. The PDSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0365] As yet another example, the terminal can determine a slot for PDSCH transmission using PDCCH monitoring information set / configured by the base station. The terminal can recognize the slot and symbol in which the PDSCH must be transmitted from an RRC message and dynamic signaling (e.g., PRI). If at least one symbol among the symbols instructed to receive the PDSCH overlaps with a flexible symbol instructed by the semi-static DL / UL allocation information and PDCCH monitoring is not configured (or assigned) for the symbol immediately preceding the symbol in which the PDSCH is transmitted, the terminal can determine the slot as the slot for PDSCH transmission and transmit the PDSCH in the slot. On the other hand, if PDCCH monitoring is configured (or assigned) for the symbol immediately preceding the symbol instructed to receive the PDSCH, the terminal can postpone PDSCH transmission in the slot and postpone PDSCH transmission to the next available slot. In other words, the terminal can recognize the symbol in which the PDSCH is transmitted in each slot from an RRC message and / or dynamic signaling (e.g., PRI). If at least one of the recognized symbols overlaps with a DL symbol of the semi-static DL / UL allocation information, or if PDCCH monitoring is configured for the symbol immediately before the symbol in which the PDSCH is transmitted, the terminal does not transmit the PDSCH in that slot. Otherwise, the terminal transmits the PDSCH in that slot. This is because a switching gap between DL and UL may be required. The PDSCH that could not be transmitted here may be postponed to be transmitted in the next available slot.

[0366] As another example, an SS / PBCH block may be configured to overlap with a DL symbol, a flexible symbol, and an UL symbol of semi-static DL / UL allocation information for a terminal. In this case, the terminal may consider a symbol overlapping with an SS / PBCH block as a semi-static DL symbol. That is, if a semi-static UL symbol is configured for the terminal and an SS / PBCH block overlaps with that symbol, the terminal may assume that the symbol is configured as a semi-static DL symbol. Furthermore, if the symbol immediately following the symbol overlapping with the SS / PBCH block is a semi-static UL symbol, the terminal may assume that the semi-static UL symbol is a semi-static flexible symbol.

[0367] When explaining whether to transmit and postpone the PDSCH, we have focused on at least one symbol when considering the symbol immediately following the symbol for PDSCH transmission. However, since the DL-UL switching gap may be set in various ways depending on the settings of the base station and the terminal, it is of course possible to determine whether to transmit and postpone the PDSCH by considering one or more symbols.

[0368] (Eighth Example)

[0369] The eighth embodiment relates to a situation in which a terminal cannot perform downlink reception and uplink transmission because the interval between a DL symbol requiring downlink reception and a UL symbol requiring uplink transmission is insufficient. At least a DL-UL switching gap is required between the terminal's downlink reception and uplink transmission. Here, the DL-UL switching gap may be referred to as a switching gap or simply as a gap.

[0370] The length of the DL-UL switching gap may vary depending on the carrier frequency. For example, a DL-UL switching gap of 13 us may be required for carrier frequencies below 6 GHz (hereinafter referred to as frequency range (FR)1). Alternatively, a DL-UL switching gap of 7 us may be required for carrier frequencies above 6 GHz (hereinafter referred to as FR2).

[0371] The DL-UL switching gap is also affected by a timing advance (TA) value and a TA offset value. The DL-UL switching gap may also be affected by subcarrier spacing (SCS). That is, the DL-UL switching gap may be determined based on the TA value, the TA offset value, and / or the subcarrier spacing. For example, if the duration of one symbol is Xus, the number of symbols (G) required for the DL-UL switching gap may be given by G = ceil((Rx2Tx + TA + TA_offset) / X). ​​Here, Rx2Tx is the time it takes for the RF circuit to switch from reception to transmission, and its value may vary depending on the carrier frequency. For carrier frequencies below 6 GHz (FR1), Rx2Tx may be 13 us, and for carrier frequencies above 6 GHz (FR2), Rx2Tx may be 7 us. TA may be the TA value configured by the base station for the terminal or the maximum TA value that can be configured by the base station for the terminal. TA_offset may be 39936*Tc or 25600*Tc in FR1 and 13792*Tc in FR2, where Tc=1 / (480*103*4096), where the switching gap may be the RF interruption time.

[0372] Table 3 shows an example of the number of symbols required for a DL-UL switching gap based on subcarrier spacing.

[0373] [Table 3]

[0374] Table 4 shows another example of the number of symbols required for the DL-UL switching gap depending on the subcarrier spacing.

[0375] [Table 4]

[0376] The following describes a method for processing uplink channels or transmission of uplink signals based on downlink signals received by a terminal and a UL-DL switching gap (G). The downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, periodic signals, measurement signals, etc. The uplink channels may include PUSCH, PUCCH, PRACH, etc., and the uplink signals may include SRS, periodic signals, measurement signals, etc.

[0377] (Method 1) - Symbols for SS / PBCH block transmission and uplink transmission

[0378] A method for a terminal to process uplink transmission, in which the terminal determines whether at least one symbol of symbols instructed to transmit an uplink channel or an uplink signal is set to overlap (i.e., contradict) with a symbol instructed to receive an SS / PBCH block from a base station (or a symbol for transmitting an SS / PBCH block), and transmits the uplink channel or the uplink signal based on the determination. In this case, if at least a part of the symbol instructed to receive an SS / PBCH block is set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0379] In yet another method for processing uplink transmission by a terminal, the terminal determines whether at least one symbol of symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a symbol to which an SS / PBCH block instructed to receive from a base station is assigned, and transmits the uplink channel or the uplink signal based on the determination. Here, if at least a portion of a G symbol is set to overlap with the transmission of an uplink channel or an uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0380] (Method 2) - Symbols for downlink transmission and uplink transmission

[0381] A method for a terminal to process uplink transmission, in which the terminal determines whether at least one symbol of symbols instructed to transmit an uplink channel or an uplink signal is set to overlap with a symbol instructed to receive downlink transmission from a base station (or a symbol for downlink transmission), and transmits the uplink channel or the uplink signal based on the determination. In this case, if at least a part of the symbol instructed to receive downlink transmission is set to overlap with the transmission of the uplink channel or the uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0382] In yet another method for a terminal to process uplink transmission, the terminal determines whether at least one symbol of a symbol instructed to transmit an uplink channel or an uplink signal is set to overlap with a G symbol following a symbol instructed to receive downlink transmission from a base station, and transmits the uplink channel or the uplink signal based on the determination. In this case, if at least a part of the G symbol is set to overlap with the transmission of the uplink channel or the uplink signal, the terminal does not transmit the uplink channel or the uplink signal, and otherwise transmits the uplink signal.

[0383] In addition to the above-described method, the base station can perform scheduling (e.g., layer 1 (L1) dynamic scheduling) so that symbols for downlink transmission and symbols for uplink transmission do not overlap. That is, when the base station performs scheduling for the terminal, it can configure uplink transmission based on the G symbol. In this case, the terminal does not need to expect the base station to configure uplink transmission for the terminal within the G symbol.

[0384] If uplink transmission is configured based on RRC configuration rather than L1 dynamic scheduling, the terminal determines whether the G symbol overlaps with the uplink transmission configured by RRC, and based on this determination, the terminal transmits or does not transmit an uplink channel or signal.

[0385] The following describes a method for a UE to process downlink reception and transmission of uplink channels (or uplink signals) based on the UL-DL switching gap (G). The downlink signals may include SS / PBCH blocks, PDSCH, PDCCH, CSI-RS, etc. The uplink channels may include PUSCH, PUCCH, PRACH, etc., and the uplink signals may include SRS, etc.

[0386] (Method 3) - Processing of downlink signals depending on whether flexible symbols and uplink signals overlap

[0387] The UE may or may not receive a downlink signal (e.g., a downlink periodic signal or a measurement signal) configured by a UE-specific RRC message on a symbol configured as a flexible symbol by the semi-static DL / UL allocation information or on a symbol not configured by the semi-static DL / UL allocation information. In this case, the UE may process the configured downlink reception based on the positional relationship (e.g., overlapping relationship) between the UL-DL switching gap and the uplink signal.

[0388] Regarding a method in which the UE processes the configured downlink reception, the UE determines whether the UE is configured to transmit an uplink signal within G symbols after the last symbol of the configured downlink signal and can receive the configured downlink signal based on the determination. Here, if the determination result shows that there is no overlap with an uplink signal within G symbols after the last symbol of the configured downlink signal, the UE can receive the configured downlink signal. Conversely, if there is overlap with an uplink signal within G symbols, the UE does not receive the configured downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information within one slot and the first symbol assigned to the uplink signal, the UE drops the downlink signal.

[0389] The uplink signal may include an uplink signal configured by a cell-specific RRC message, for example, the uplink signal configured by the cell-specific RRC message may include a PRACH.

[0390] The uplink signal may include an uplink signal indicated by the L1 signaling. For example, the uplink signal indicated by the L1 signaling may include a PUSCH scheduled in DCI format 0_0 or 0_1. The uplink signal indicated by the L1 signaling may also include a PUCCH including a HARQ-ACK response to a PDSCH scheduled in DCI format 1_0 or 1_1. The uplink signal indicated by the L1 signaling may also include an SRS signal indicated by the DCI. The uplink signal indicated by the L1 signaling may also include a first transmission of uplink semi-persistent scheduled (SPS) PDSCH transmissions indicated by the DCI scrambled with the CS-RNTI.

[0391] The downlink signal may include a CSI-RS configured by a terminal-specific RRC message. For example, the downlink signal may include a CORESET for PDCCH monitoring configured by a terminal-specific RRC message. The downlink signal may also include a downlink SPS PDSCH transmission (excluding the first transmission) scrambled with the CS-RNTI.

[0392] In yet another method for a terminal to process the downlink reception, the terminal may determine whether any of G symbols after the last symbol of the downlink signal overlaps with a UL symbol configured according to semi-static DL / UL allocation information, and receive the downlink signal based on the determination. If the determination result shows that any of G symbols overlaps with a UL symbol configured according to semi-static DL / UL allocation information, the terminal does not receive the downlink signal; otherwise, the terminal receives the downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information in one slot and the first symbol assigned as an uplink signal, the terminal drops the downlink signal.

[0393] In yet another method for a terminal to process the configured downlink reception, the terminal may determine whether a UL symbol indicated by a dynamic SFI overlaps within G symbols after the last symbol of the configured downlink signal, and receive the configured downlink signal based on the determination. If the determination result shows that a UL symbol indicated by a dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information within one slot and the first symbol assigned as an uplink signal, the terminal drops the downlink signal.

[0394] In yet another method for a terminal to process the configured downlink reception, the terminal determines whether a DL symbol configured by semi-static DL / UL allocation information overlaps within G symbols before the first symbol of an uplink signal, and based on the determination, the terminal can receive the configured downlink signal. As a result of the determination, if a DL symbol configured by semi-static DL / UL allocation information overlaps within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured by semi-static DL / UL allocation information within one slot and the first symbol assigned as an uplink signal, the terminal drops the downlink signal.

[0395] In yet another method for a terminal to process the configured downlink reception, the terminal determines whether a DL symbol indicated by a dynamic SFI overlaps within G symbols before the first symbol of an uplink signal, and receives the configured downlink signal based on the determination. If the determination result indicates that a DL symbol indicated by a dynamic SFI overlaps within G symbols, the terminal does not receive the configured downlink signal; otherwise, the terminal receives the configured downlink signal. That is, if there are not at least G gap symbols between the last DL symbol configured according to semi-static DL / UL allocation information within one slot and the first symbol assigned as an uplink signal, the terminal drops the downlink signal.

[0396] The above-mentioned method of processing uplink transmission by the terminal may include an operation in which, for a symbol configured as a flexible symbol by semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, the terminal does not expect an uplink signal to be configured or indicated by an L1 signal during G symbols following a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message.

[0397] (Method 4) - Processing of uplink signals depending on whether flexible symbols overlap with downlink signals

[0398] The UE may or may not transmit an uplink signal (e.g., an uplink periodic signal or a measurement signal) configured by a UE-specific RRC message in a symbol configured as a flexible symbol by the semi-static DL / UL allocation information or in a symbol not configured by the semi-static DL / UL allocation information. In this case, the method by which the UE processes the uplink transmission may be determined based on the positional relationship (e.g., overlapping relationship) between the UL-DL switching gap and the downlink signal.

[0399] In the method for processing the configured uplink transmission by a terminal, the terminal can transmit the configured uplink signal based on whether it receives a downlink signal within G symbols before the first symbol of the configured uplink signal. That is, if there is no overlap with a downlink signal within G symbols before the first symbol of the configured uplink signal, the terminal can transmit the configured uplink signal. Conversely, if there is overlap with a downlink signal within G symbols, the terminal does not transmit the configured uplink signal. That is, if there are not at least G gap symbols between the first UL symbol configured according to semi-static DL / UL allocation information in one slot and the last symbol assigned as a downlink signal, the terminal drops the uplink signal.

[0400] Here, the downlink signal may include a downlink signal configured by a cell-specific RRC message. The downlink signal configured by the cell-specific RRC message may include an SS / PBCH block. The downlink signal configured by the cell-specific RRC message may also include a type-0 common search space. Here, the type-0 common search space is a search space for receiving remaining minimum scheduling information (RMSI). The downlink signal configured by the cell-specific RRC message may also include a type-0A common search space. Here, the type-0A common search space is a search space for receiving a PRACH response in a random access process.

[0401] The downlink signal may include a downlink signal indicated by the L1 signaling. For example, the uplink signal indicated by the L1 signaling may include a PDSCH scheduled in DCI format 1_0 or 1_1. The uplink signal indicated by the L1 signaling may also include an aperiodic CSI-RS indicated by the DCI. The uplink signal indicated by the L1 signaling may also include a first transmission of an uplink semi-persistent scheduled PDSCH (SPS) transmission indicated by the DCI scrambled with the CS-RNTI.

[0402] Meanwhile, the uplink signal may include an SRS configured by a terminal-specific RRC message, a periodic PUCCH and a PUSCH configured by a terminal-specific RRC message, or an SR configured by a terminal-specific RRC message.

[0403] In yet another method for processing the configured uplink transmission, a terminal may determine whether a DL symbol configured according to semi-static DL / UL allocation information overlaps within G symbols before the first symbol of the configured uplink signal, and transmit the configured uplink signal based on the determination. If the determination result shows that a DL symbol configured according to semi-static DL / UL allocation information does not overlap within the G symbols, the terminal transmits the configured uplink signal; otherwise, the terminal does not transmit the configured uplink signal. That is, if there are not at least G gap symbols between the first UL symbol configured according to semi-static DL / UL allocation information within one slot and the last symbol assigned as a downlink signal, the terminal drops the uplink signal.

[0404] In addition to the above-described method, the terminal may include an operation in which, for a symbol configured as a flexible symbol by semi-static DL / UL allocation information or a symbol not configured by semi-static DL / UL allocation information, the terminal does not expect a downlink signal to be configured or indicated by L1 signaling during G symbols following a downlink signal (downlink periodic signal or measurement signal) configured by a terminal-specific RRC message.

[0405] For symbols configured as flexible symbols by semi-static DL / UL allocation information or symbols not configured by semi-static DL / UL allocation information, if the number of symbols between the last symbol of a downlink signal configured by a cell-specific RRC message or indicated by L1 signaling and the first symbol of an uplink signal configured by a cell-specific RRC message or indicated by L1 signaling is less than G, the terminal operates as follows.

[0406] The terminal receives downlink signals configured by cell-specific RRC messages, but does not need to transmit uplink signals configured by cell-specific RRC messages or indicated by L1 signaling.

[0407] The terminal may transmit uplink signals configured by a cell-specific RRC message, and may not receive downlink signals configured by a cell-specific RRC message or indicated by L1 signaling.

[0408] The terminal can operate according to L1 signaling. That is, if the L1 signaling indicates downlink reception and the cell-specific RRC message configures uplink transmission, the terminal performs downlink reception but does not have to perform uplink transmission. Conversely, if the L1 signaling indicates uplink reception and the cell-specific RRC message configures downlink transmission, the terminal performs uplink transmission but does not have to perform downlink reception.

[0409] Hereinafter, in this specification, reception of a synchronization signal block (SSB) in an SS block based RRM measurement timing configuration (SMTC) will be described.

[0410] The terminal must be able to measure without a measurement gap when the SSB is completely included in the terminal's active bandwidth part. If the subcarrier spacing of the measurement signal is different from that of the PDSCH / PDCCH or in the frequency range FR2, there may be limitations on scheduling flexibility.

[0411] Specifically, if the subcarrier spacing of the measurement signal in the frequency range FR1 is the same as that of the PDSCH / PDCCH, there is no restriction on scheduling availability. However, if the subcarrier spacing of the measurement signal in the frequency range FR1 is different from that of the PDSCH / PDCCH, there may be a scheduling availability restriction, as will be described later. First, if the terminal can receive SSBs and data signals with different subcarrier spacings (i.e., if the terminal supports simultaneousRxDataSSB-DiffNumerology), there is no scheduling availability restriction. Conversely, if the terminal cannot receive SSBs (synchronization signal blocks) and data signals with different subcarrier spacings (i.e., if the terminal does not support simultaneousRxDataSSB-DiffNumerology), the terminal has a scheduling availability restriction. In this case, the following scheduling availability restriction is applied to SS-RSRP / RSRQ / SINR measurements.

[0412] i) If deriveSSB_IndexFromCell is enabled, the terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH on consecutive SSB symbols within the SMTC window, one symbol immediately before the consecutive SSB symbols, and one symbol immediately after the consecutive SSB symbols.

[0413] ii) If deriveSSB_IndexFromCell is disabled, the terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH in all symbols within the SMTC window.

[0414] deriveSSB_IndexFromCell indicates whether the UE can use the timing of a cell with the same SSB frequency and subcarrier spacing to derive the SSB index of the cell for the indicated SSB frequency and subcarrier spacing.

[0415] In the frequency range FR2, the following scheduling availability restrictions apply for SS-RSRP / SINR measurements:

[0416] i) The terminal does not expect to receive a PDCCH / PDSCH or transmit a PUCCH / PUSCH in consecutive SSB symbols, one symbol immediately before the consecutive SSB symbols, and one symbol immediately after the consecutive SSB symbols within the SMTC window.

[0417] In the frequency range FR2, the following scheduling availability restrictions apply for SS-RSRQ measurements:

[0418] i) The terminal does not expect to receive PDCCH / PDSCH or transmit PUCCH / PUSCH in consecutive SSB symbols and RSSI measurement symbols within the SMTC window, and one symbol immediately before and one symbol immediately after these consecutive SSB / RSSI symbols.

[0419] In the above description, the SMTC window follows smtc2 if smtc2 is configured from an upper layer, otherwise it follows smtc1.

[0420] This specification describes a method for determining slots for repeatedly transmitting a PUCCH in accordance with the scheduling availability constraint when a terminal has a constraint on scheduling availability for receiving a measurement signal. Specifically, when a terminal is configured to repeatedly transmit a PUCCH K times, the terminal must determine K slots for repeatedly transmitting the PUCCH.

[0421] A UE is configured with carrier aggregation or dual connectivity that aggregates and transmits from two or more cells, and for convenience, it is assumed that the UE is configured with two cells. The following description is also applicable to the case where the UE is configured with two or more cells. One of the two cells is a Pcell, and the Pcell is a cell from which the UE transmits a PUCCH. The other of the two cells is an Scell, and the Scell ​​is a cell from which the UE does not transmit a PUCCH. A measurement signal may be configured in the Scell.

[0422] The terminal may be set / configured by a higher layer with the MeasObjectNR IE (information element). The MeasObjectNR IE contains information for intra / inter-frequency measurements. The ssbFrequency included in the MeasObjectNR IE indicates the SSB frequency, the ssbFrequencySpacing indicates the SSB subcarrier spacing, and the ssb-ToMeasure indicates information about the time domain configuration of the SSB to be measured. The smtc1 or smtc2 included in the MeasObjectNR IE indicates the SMTC window configuration.

[0423] When the terminal is set / configured to repeatedly transmit the PUCCH in K slots, the method of determining the K slots for transmitting the PUCCH is as follows: i) If a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured with MeasObjectNR) in the SMTC window, the terminal does not include that slot in the K slots for transmitting the PUCCH. ii) If a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured with MeasObjectNR) and one symbol immediately following the measurement signal in the SMTC window, the terminal does not include that slot in the K slots for transmitting the PUCCH. iii) If a symbol assigned to PUCCH transmission in one slot overlaps with a measurement signal (SSB configured with MeasObjectNR) and one symbol immediately following or immediately preceding the measurement signal in the SMTC window, the terminal does not include that slot in the K slots for transmitting the PUCCH. The above i) to iii) may be applied only when scheduling availability is limited.

[0424] After the terminal is set / configured to repeatedly transmit the PUCCH in K slots and has determined the K slots for transmitting the PUCCH, the PUCCH transmission method within the SMTC window is as follows: i) If a symbol assigned to PUCCH transmission within a slot overlaps with a measurement signal (SSB configured with MeasObjectNR) and the symbol immediately following the measurement signal within the SMTC window, the terminal does not transmit the PUCCH in the slot. ii) If a symbol assigned to PUCCH transmission within a slot overlaps with a measurement signal (SSB configured with MeasObjectNR) and the symbol immediately following the measurement signal within the SMTC window, the terminal does not transmit the PUCCH in the slot. iii) If a symbol assigned to PUCCH transmission within a slot overlaps with a measurement signal (SSB configured with MeasObjectNR) and the symbol immediately following or the symbol immediately preceding the measurement signal within the SMTC window, the terminal does not transmit the PUCCH in the slot. i) to iii) may be applied only when scheduling availability is limited.

[0425] This specification describes a method for determining slots for PUCCH repeated transmission when a terminal has only half-duplex communication capability. If a terminal has only half-duplex communication capability, the terminal cannot transmit and receive simultaneously. That is, when the terminal transmits in one cell, it cannot receive in another cell. Similarly, when the terminal receives in one cell, it cannot transmit in another cell. Therefore, the terminal must operate in only one direction, either transmission or reception, in one cell.

[0426] This specification also describes a method for determining K slots in which a terminal transmits a PUCCH when there are measurement signals that the terminal must receive in the Pcell / Scell ​​and the Pcell is set / configured to repeatedly transmit a PUCCH in K slots. If the terminal determines K slots in which to transmit a PUCCH in the Pcell without considering the measurement signals that the terminal must receive in the Pcell / Scell, the terminal must transmit the PUCCH in the Pcell and receive measurement signals in the Pcell / Scell ​​in some slots. This is possible for a terminal with full-duplex communication capability, but is disadvantageous in that it is impossible for a terminal with only half-duplex communication capability. Therefore, the terminal must consider the measurement signals of the Pcell / Scell ​​to determine the slots in which to transmit a PUCCH.

[0427] A method for determining K slots in which a terminal with half-duplex capability will repeatedly transmit a PUCCH, in which if the measurement signal of a Pcell / Scell ​​within an SMTC window overlaps with a symbol assigned to PUCCH transmission in one slot, the terminal can exclude that slot from the K slots in which it will repeatedly transmit a PUCCH.

[0428] A method for determining K slots in which a terminal with half-duplex communication capability will repeatedly transmit a PUCCH, in which if a symbol allocated for PUCCH transmission in one slot overlaps with a measurement signal of a Pcell / Scell ​​and one symbol immediately following the measurement signal within an SMTC window, the terminal can exclude the slot from the K slots in which the terminal will repeatedly transmit a PUCCH.

[0429] A method for a terminal with half-duplex capability to determine K slots for repeatedly transmitting a PUCCH, in which if a symbol allocated for PUCCH transmission in one slot overlaps with a measurement signal of a Pcell / Scell ​​and one symbol immediately following or one symbol immediately preceding the measurement signal within an SMTC window, the terminal can exclude the slot from the K slots for repeatedly transmitting a PUCCH.

[0430] In this case, the measurement signal may include an SSB configured by MeasObjectNR. The measurement signal may also include a CSI-RS configured by MeasObjectNR. Here, the CSI-RS may be configured using the csi-rs-ResourceConfigMobility IE in the MeasObjectNR.

[0431] 3GPP NR Rel-16 enhanced URLLC (eURLLC) will introduce a technology for providing services with low latency and high reliability. In particular, in the uplink, a method in which a terminal repeatedly transmits a physical uplink data channel (physical uplink shared channel, PUSCH) to a base station as quickly as possible may be supported to reduce latency and increase reliability. Hereinafter, this specification will describe a method in which a terminal repeatedly transmits a physical uplink data channel as quickly as possible.

[0432] A terminal receives scheduling information for a PUSCH from a base station via a PDCCH (or DCI). The terminal transmits a PUSCH on the uplink based on the received scheduling information. In this case, the terminal can identify the time-frequency resource on which the PUSCH is transmitted using time domain resource assignment and frequency domain resource assignment for PUSCH transmission included in the DCI. The time resource on which the PUSCH is transmitted is composed of consecutive symbols, and one PUSCH is not scheduled across a slot boundary.

[0433] 3GPP NR Rel-15 supports inter-slot repeated transmission of PUSCH. First, the number of repeated transmissions may be configured in the terminal from the base station. For example, assume that the configured value is K. If the terminal receives a PDCCH (or DCI) scheduling a PUSCH in slot n and is instructed / configured to transmit the PUSCH in slot n+k, the terminal can transmit the PUSCH in K consecutive slots starting from slot n+k. That is, the terminal can transmit the PUSCH in slot n+k, slot n+k+1, ..., slot n+k+K-1. The time and frequency resources for transmitting the PUSCH in each slot are the same as those instructed / configured in the DCI. That is, the PUSCH may be transmitted using the same symbol and the same PRB in the slot. Frequency hopping may be configured in the terminal to obtain diversity gain in the frequency domain. Frequency hopping includes intra-slot frequency hopping, which performs frequency hopping within a slot, and inter-slot frequency hopping, which performs frequency hopping for each slot. When intra-slot frequency hopping is configured in a terminal, the terminal divides the PUSCH in each slot into two halves in the time domain, transmits one half using a scheduled PRB, and transmits the other half using a PRB obtained by adding an offset value to the scheduled PRB. Here, two or four offset values ​​may be configured by a higher layer, and any one of these values ​​may be indicated by DCI. When inter-slot frequency hopping is configured in a terminal, the terminal transmits the PUSCH using a scheduled PRB in odd-numbered slots where the PUSCH is transmitted, and transmits the PUSCH using a PRB obtained by adding an offset value to the scheduled PRB in even-numbered slots.When the UE performs repeated transmission in a slot, if the symbol in which the PUSCH must be transmitted in a specific slot is configured as a semi-static DL symbol, the UE does not transmit the PUSCH in the slot, and the PUSCH that could not be transmitted is deferred to another slot and not transmitted.

[0434] The above-mentioned Rel-15 repeated transmission is not suitable for providing eURLLC services because i) it is difficult to provide high reliability and ii) it has drawbacks such as long delay time. Specifically, if one slot consists of 14 symbols and the PUSCH is transmitted using symbols 12 and 13, it must also be repeated and transmitted using symbols 12 and 13 in the next slot. As a result, even though the PUSCH can be transmitted using symbols 1 to 11 in the next slot, it is not transmitted, making it difficult to achieve high reliability. Also, assume that one slot consists of 14 symbols and the PUSCH is transmitted using symbols 0 to 13 to achieve high reliability. In order for the base station to successfully receive the PUSCH, it must receive the last symbol of the PUSCH, i.e., symbol 13. As a result, there is a drawback in that the delay time becomes longer depending on the length of the PUSCH.

[0435] To solve this problem, this specification describes a method for repeatedly transmitting a PUSCH within one slot. Specifically, a terminal can continuously and repeatedly transmit a scheduled PUSCH. The term "continuously" means that a PUSCH is transmitted again from the symbol immediately after one PUSCH ends. This may be referred to as mini-slot-level PUSCH repetition, and the above-mentioned 3GPP NR Rel-15 repetition transmission method may be referred to as slot-level PUSCH repetition.

[0436] The above-mentioned problems can be solved by applying the mini-slot-level PUSCH repetition method. Specifically, i) high reliability can be provided. For example, if one slot is composed of 14 symbols and the PUSCH is transmitted at symbols 12 and 13, it may be repeatedly transmitted at symbols 1 and 2 in the next slot. Therefore, since the PUSCH is transmitted immediately and consecutively, high reliability can be achieved. In addition, ii) delay time can be reduced. For example, assume that one slot is composed of 14 symbols and the PUSCH is transmitted at symbols 0 to 1 to achieve high reliability. Since the PUSCH is repeatedly transmitted within the slot, it may be transmitted at symbols 2 to 3 and then at symbols 4 to 5. Therefore, reliability similar to that of transmitting a PUSCH with a length of 14 slots can be achieved. However, in this case, depending on the channel condition, the base station does not necessarily have to receive all repeated transmissions to successfully receive the signal, and successful reception may occur in the middle of the repeated transmissions. Therefore, depending on the situation, the terminal may successfully receive the PUSCH after symbol 2 when the first repeated transmission ends, thereby reducing the delay time.

[0437] Hereinafter, a case where mini-slot-level PUSCH repetition is continuously repeated and transmitted in another slot beyond the slot will be described. As described above, mini-slot-level PUSCH repetition starts the repetitive transmission of the next PUSCH from the symbol immediately after one PUSCH transmission ends. However, continuous transmission may not be possible in the following situations.

[0438] i) First, when PUSCH repetition transmission is performed from the symbol immediately following the symbol at which the initial PUSCH transmission ends, the symbol for PUSCH transmission overlaps with a semi-static DL symbol. In this case, the PUSCH cannot be transmitted from the immediately following symbol because it overlaps with the semi-static DL symbol. Therefore, the PUSCH can be repeatedly transmitted in other symbols.

[0439] ii) Next, when a PUSCH is repeatedly transmitted from the symbol immediately following the symbol where the initial PUSCH transmission ends, the repeatedly transmitted PUSCH crosses the slot boundary. A PUSCH is not allowed to cross the slot boundary, and the PUSCH can be transmitted in another symbol.

[0440] In this specification, a PUSCH repetitive transmission method that takes into account cases i) and ii) will be described.

[0441] FIG. 18 illustrates mini-slot-level PUSCH repetitive transmission according to an embodiment of the present invention.

[0442] When a terminal is configured to perform mini-slot-level PUSCH repetition, the terminal transmits a PUSCH in the symbol immediately following one PUSCH transmission. If the PUSCH cannot be transmitted (as described above, if it overlaps with a semi-static DL symbol or crosses a slot boundary), the terminal can transmit the PUSCH in the earliest symbol available for transmission. Here, the earliest symbol available for transmission refers to a case where the PUSCH does not overlap with a semi-static DL symbol or cross a slot boundary. Referring to FIG. 18, the terminal is configured to transmit four times using mini-slot-level PUSCH repetition, and may be configured / instructed by the PDCCH (or DCI) to transmit the PUSCH over four symbols starting from the fifth symbol of the slot. In FIG. 18, D, U, and F represent downlink symbols, uplink symbols, and flexible symbols in a semi-static DL / UL configuration. The UE transmits the first PUSCH at symbols 5 to 8 of the slot, and can check whether the second PUSCH can be transmitted at symbols 9 to 12, which is the PUSCH repetition transmission period immediately thereafter. If transmission is possible (i.e., if it does not overlap with a semi-static DL symbol and does not cross a slot boundary), the UE can transmit the second PUSCH at symbols 9 to 12. In this case, the PUSCH starting from symbol 13, which is the symbol following the last symbol (symbol 12) used to transmit the second PUSCH, crosses the slot boundary and overlaps with a semi-static DL symbol, so the third PUSCH cannot be transmitted. The next transmittable symbols are symbols 3 to 6 of the next slot, which are flexible symbols and therefore PUSCH transmission is possible. Therefore, the third repeated transmission PUSCH is transmitted at these symbols. Thereafter, the fourth repeated transmission PUSCH is transmitted in symbols 7 to 10.The terminal has completed four repetitive transmissions and will not transmit any more repetitive transmissions.

[0443] FIG. 19 illustrates a mini-slot-level PUSCH repetitive transmission according to yet another embodiment of the present invention.

[0444] When the UE is configured / instructed to perform mini-slot-level PUSCH repetition, the UE transmits the PUSCH in the symbol immediately following one PUSCH transmission. In this case, if the PUSCH is not transmitted (semi-static DL symbol, overlaps with X flexible symbols immediately following the semi-static DL symbol, or crosses a slot boundary), the UE can transmit the PUSCH in the earliest symbol available for PUSCH transmission. Here, the earliest available symbol means a symbol in which the PUSCH does not overlap with a semi-static DL symbol, does not overlap with X flexible symbols immediately following the semi-static DL symbol, or does not cross a slot boundary. Referring to FIG. 19, it is assumed that a UE is configured to transmit a PUSCH four times using mini-slot-level PUSCH repetition and is instructed by a PDCCH (or DCI) to transmit a PUSCH over four symbols starting from the fifth symbol of the slot. D, U, and F in FIG. 19 denote downlink symbols, uplink symbols, and flexible symbols in a semi-static DL / UL configuration. According to FIG. 19, the UE transmits a PUSCH at symbols 5 to 8 of the first slot and checks whether PUSCH transmission is possible at symbols 9 to 12, which is the PUSCH repetition transmission interval immediately thereafter. If transmission is possible (i.e., if there is no overlap with a semi-static DL symbol, no overlap with X flexible symbols immediately after the semi-static DL symbol, and no slot boundary is crossed), the UE can transmit the second repeated transmission PUSCH at symbols 9 to 12. The third PUSCH transmission interval, which starts from the next symbol 13, crosses a slot boundary and overlaps with a semi-static DL symbol, so the third PUSCH cannot be transmitted. Figure 19(a) shows the case where X=1, and Figure 19(b) shows the case where X=2.Referring to FIG. 19(a), the next period in which PUSCH transmission is possible is symbol 4 to symbol 7 in the next slot. This symbol is a flexible symbol, so transmission is possible. Therefore, the third repeated transmission PUSCH is transmitted at this symbol. Then, the fourth repeated transmission PUSCH is transmitted at symbols 8 to 11. The terminal has completed four repeated transmissions, so no further repeated transmissions are performed. Referring to FIG. 19(b), the next period in which PUSCH transmission is possible is symbol 5 to symbol 8 in the next slot. This symbol is a flexible symbol or a semi-static UL symbol, so transmission is possible. Therefore, the third repeated transmission PUSCH is transmitted at this symbol. Then, the fourth repeated transmission PUSCH is transmitted at symbols 9 to 12. The terminal has completed the fourth repeated transmission, so no further repeated transmissions are performed.

[0445] If an SS / PBCH block is configured in a cell that repeatedly transmits a PUSCH, or if an SS / PBCH block for measurement is configured in another cell and measurement must be performed, the UE processes the symbol corresponding to the SS / PBCH block the same as a semi-static DL symbol. For example, as described above, when a PUSCH cannot be transmitted, in addition to a semi-static DL symbol, a symbol overlapping with the SS / PBCH block, and X flexible symbols immediately after the symbol overlapping with the SS / PBCH block may be included, in addition to a case where the semi-static DL symbol overlaps with X flexible symbols immediately after the semi-static DL symbol or crosses a slot boundary.

[0446] A UE configured to repeatedly transmit a PUSCH K times can postpone the PUSCH until it finds a transmittable symbol, transmitting the PUSCH K times. However, postponing the PUSCH for an excessively long period of time does not conform to the purpose of mini-slot-level PUSCH repetition. Mini-slot-level PUSCH repetition is a method for supporting uplink URLLC services, but postponing the PUSCH for an excessively long period of time violates the requirements of the URLLC service. In addition, the operation of postponing the PUSCH for an excessively long period of time to transmit the PUSCH prevents the base station from using the corresponding resources for other UEs, resulting in a waste of network resources. Therefore, this specification describes conditions for terminating repeated transmission in mini-slot-level PUSCH repetition.

[0447] FIG. 20 illustrates a condition for terminating mini-slot-level PUSCH repetitive transmission according to an embodiment of the present invention.

[0448] i) When a new PUSCH having the same HPN (HARQ Process number) as the PUSCH to be repeatedly transmitted is scheduled, the UE may discontinue repeating the previous PUSCH. Specifically, referring to FIG. 20(a), the scheduling information for scheduling the PUSCH to be repeatedly transmitted includes HPN=i. If another PDCCH (or DCI) that schedules the PUSCH (DCI format 0_0 or 0_1) has the same HPN (HPN=i) as the HPN or if new data indication (NDI) is toggled, repeated transmission of the PUSCH after the PDCCH may not be performed. In addition, since it takes processing time to receive the PDCCH and cancel the PUSCH, the PUSCH from a certain time before the last symbol of the PDCCH is not canceled, and only the subsequent PUSCH may be canceled.

[0449] ii) If another PUSCH is scheduled in the same symbol as the PUSCH to be repeatedly transmitted, the UE may not repeatedly transmit the PUSCH. Referring to FIG. 20(b), if a PDCCH is scheduled to overlap with a previously scheduled PUSCH in the time domain, the repeated transmission of the PUSCH may be terminated.

[0450] iii) If the UE receives an explicit HARQ-ACK for the PUSCH to be repeatedly transmitted, the UE may not perform further repeated transmission. The explicit HARQ-ACK refers to information that the base station sends to the UE via a separate channel to inform the UE whether the PUSCH transmission was successful.

[0451] iv) The terminal may no longer transmit the repeatedly transmitted PUSCH after a certain time. For example, if a requirement for a URLLC service in which a PUSCH is transmitted is to complete transmission within 1 ms, the terminal may no longer transmit the PUSCH after 1 ms. The certain time may be an absolute time such as 1 ms, or may be defined as a slot such as 2 slots. In this case, the certain time is a value that can be set by the base station.

[0452] A UE configured to repeatedly transmit a PUSCH K times can count the number of PUSCHs transmitted K times. Conventionally, a UE increases the number of PUSCHs to be repeatedly transmitted only when actually transmitting a PUSCH. However, as described above, transmitting a PUSCH K times may result in an excessively long delay. To address this issue, a counting rule will be described in this specification.

[0453] FIG. 21 is a diagram of a counting rule for mini-slot-level PUSCH repetition transmission according to an embodiment of the present invention.

[0454] i) When the terminal actually transmits a PUSCH, it counts the number of PUSCHs. Also, the terminal counts that the PUSCH cannot be transmitted for Y symbols. If the counted value exceeds the number of PUSCH repetitions K, the PUSCH is not transmitted any more. Here, Y symbols may be the number of symbols allocated to the PUSCH. Also, Y symbols may be the number of symbols included in one slot. Also, Y symbols may be a value set / configured by a higher layer.

[0455] Figure 21(a) shows the number of PUSCH repeat transmissions obtained by i). Referring to Figure 21(a), it is assumed that the UE is configured / instructed to transmit the PUSCH four times (K=4) and that Y=5 is set. The UE does not transmit the PUSCH repeat transmission in the first symbol of the first slot and the first four symbols of the second slot, but must count the number of PUSCHs because transmission was not possible between Y=5 symbols (from the last symbol of the first slot to the fourth symbol of the second slot). Then, the UE can transmit the last (fourth) PUSCH repeat transmission in symbols 4, 5, 6, and 7 of the second slot.

[0456] ii) When the terminal actually transmits a PUSCH, the number of PUSCHs is counted. Also, when no PUSCH repetitions are performed in Z slots, the number of PUSCHs is counted. When the counted number of PUSCHs exceeds the number of PUSCH repetitions K, the PUSCH is no longer transmitted. In this case, Z slots may be 1 slot. Also, Z slots may be a value configured by a higher layer.

[0457] Figure 21(b) shows the number of PUSCH repetitions obtained by ii). Assume that the UE is configured / instructed to transmit the PUSCH four times (K=4) and Z=1. Although the UE does not transmit the PUSCH repetitions in the second slot (3 in Figure 21(b)), the number of PUSCHs is counted because the PUSCH could not be transmitted during one slot. Then, the final (fourth) PUSCH repetition may be transmitted at symbols 10, 11, 12, and 13 in the third slot.

[0458] According to the 3GPP standard document, the PUSCH used by a terminal to transmit uplink data cannot cross a slot boundary. That is, the start symbol and the last symbol of a scheduled PUSCH must always be located in the same slot (in the case of repeated PUSCH transmission, the start symbol and the last symbol may be located in different slots. However, general PUSCH transmission excluding repeated transmission will be described here). Specifically, the base station can inform the terminal of information regarding symbols that can transmit the PUSCH using a starting and length indication value (SLIV). The SLIV can indicate the position (represented as S, which may have any one of values ​​0, 1, 2, ..., 13) and length (represented as L, which may have any one of values ​​1, 2, ..., 14) of the start symbol within a slot. In other words, the SLIV value has any one of values ​​S+L=1, 2, ..., 14. If a combination such that S+L>14 is used, the start symbol and the last symbol can be located in the same slot. For example, if S=5 and L=10, it starts from the sixth symbol of the slot and has a length of 10 symbols, so one symbol becomes the first symbol of the next slot. Therefore, the start symbol and the end symbol are located in different slots and do not match. SLIV can be obtained from the following equation 3.

[0459]

number

[0460] To provide URLLC services, the base station must allocate resources to the terminal so that PUSCH transmission begins as soon as possible. Furthermore, a sufficient number of symbols must be used to meet reliability requirements. However, since PUSCHs must not be scheduled across slot boundaries, if there are not enough symbols available for uplink transmission in the current slot, PUSCH transmission must be scheduled in the next slot. This poses a problem of time delay until the transmission of the next slot, which is not suitable for URLLC services. To address this issue, this specification describes an SLIV design method that enables scheduling across slot boundaries.

[0461] When a UE receives an SLIV value that crosses a slot boundary (i.e., S+L>14), the UE cannot transmit a PUSCH across the slot boundary. Therefore, the UE can transmit a first PUSCH using symbols included in an earlier slot and a second PUSCH using symbols included in a later slot based on the slot boundary. Specifically, the first PUSCH with a length of L1=13-S+1 may be transmitted from symbol S to symbol 13 (the last symbol) of the earlier slot, and the second PUSCH with a length of L2 may be transmitted from symbol 0 to symbol L2-1 of the later slot. Here, L2=L-L1. The first and second PUSCHs may be repeated transmissions of the same transport block (TB). In this case, if a symbol is not transmittable in the uplink, the UE can transmit the first and second PUSCHs using the remaining symbols other than the symbol. Here, the symbols that cannot be transmitted in the uplink may be a DL symbol determined by semi-static DL / UL assignment, P flexible symbols immediately following the DL symbol, a symbol corresponding to an SS / PBCH block, or P flexible symbols immediately following a symbol corresponding to an SS / PBCH block, where P may have a value of 1 or 2.

[0462] FIG. 22 is a diagram illustrating PUSCH transmission taking into account slot boundaries according to an embodiment of the present invention.

[0463] Referring to Figure 22(a), when a PUSCH with a start symbol of symbol 6(S) and a length of 14 is scheduled, a first PUSCH with a length of 8 may be transmitted from symbol 6 to symbol 13 in the first slot, and a second PUSCH with a length of 6 may be transmitted from symbol 0 to symbol 5 in the second slot. Referring to Figure 22(b), if the first two symbols in the second slot are symbols that cannot be transmitted in the uplink, the terminal does not need to transmit a PUSCH using those two symbols. Therefore, the second PUSCH may be transmitted using four symbols starting from the third symbol in the second slot.

[0464] As shown in FIG. 22(b), if there is a symbol that cannot be used for uplink transmission, the length of the PUSCH is reduced. To prevent this, if a symbol for PUSCH transmission overlaps with a symbol that cannot be transmitted in the uplink, the PUSCH can be transmitted by shifting it to a symbol that can be transmitted in the uplink after the symbol that cannot be transmitted in the uplink. For example, referring to FIG. 22(c), if the first two symbols of the second slot are symbols that cannot be transmitted in the uplink, the terminal can transmit the second PUSCH using the six symbols that can be transmitted in the uplink after those two symbols. In this case, although the transmission of the PUSCH may be delayed for a while, the number of symbols allocated to the PUSCH can be maintained, thereby preventing degradation of PUSCH reception performance.

[0465] Hereinafter, in this specification, a SLIV design method will be described.

[0466] SLIV can be designed to meet the following requirements:

[0467] The position of the starting symbol (S) can have any one of values ​​0, 1, ..., 13, and the length of the entire PUSCH (L) can have any one of values ​​1, 2, ..., 14. Here, there is no other restriction on the value of S+L, and it can have any value from 1 to 27. The SLIV that satisfies this condition can be calculated as follows:

[0468] - SLIV=S+14*(L-1) or

[0469] - SLIV=L-1+14*S

[0470] When SLIV=S+14*(L-1) is used as the formula for calculating SLIV, S can be obtained as the remainder when SLIV is divided by 14 (S=SLIV mod 14), and L can be obtained by adding 1 to the quotient obtained by dividing SLIV by 14 (L=floor(SLIV / 14)+1). On the other hand, when SLIV=L-1+14*S is used as the formula for calculating SLIV, L can be obtained as the remainder when SLIV is divided by 14 and adding 1 to the quotient (L=(SLIV mod 14)+1), and S can be obtained as the quotient obtained by dividing SLIV by 14 (S=floor(SLIV / 14)).

[0471] When the SLIV is determined in the above manner, the UE may be scheduled beyond the boundary of one slot. However, when scheduling PUSCH transmission in this manner, it is not possible to schedule up to the last symbol of the second slot (the first slot is the one before the slot boundary, and the second slot is the one after the slot boundary). This causes a problem in terms of inefficient frequency usage efficiency because only some symbols are used even though there are symbols available in the second slot. Hereinafter, this specification will describe a method for solving this problem.

[0472] The position of the start symbol (S) can have any one of values ​​0, 1, ..., 13, and the length of the entire PUSCH (L) can have any one of values ​​1, 2, ..., 28. Here, the value of S + L must be equal to or less than 28. For reference, here, L can be up to 28, but since the PUSCH transmitted by the SLIV is divided at the slot boundary, the length of one PUSCH is equal to or less than 14 symbols. The equation for finding the SLIV that satisfies this condition is as shown in Equation 4.

[0473]

number

[0474] Generally speaking, the position (S) of the start symbol can have one of the values ​​0, 1, ..., B, and the length (L) of the entire PUSCH can have one of the values ​​1, 2, ..., A. Here, the value of S+L must be equal to or less than A. The formula for calculating the SLIV that satisfies this condition is shown in Equation 5.

[0475]

number

[0476] In this case, if A=14 and B=13, it is the same as Equation 3, and if A=28 and B=13, it is the same as Equation 4. A may be determined as a multiple of the number of symbols included in one slot. For example, if the number of symbols included in one slot is 14, A may be determined as a value such as 14, 28, or 42. Furthermore, B may be determined as a value obtained by subtracting 1 from a multiple of the number of symbols included in one slot. For example, if the number of symbols included in one slot is 14, B may be determined as a value such as 13, 27, or 41.

[0477] The SLIV value in Equation 3 may be obtained by multiplying the length by an integer to obtain an SLIV value that crosses slot boundaries. The position of the start symbol (S) can have a value of 0, 1, ..., 13, and the length of the entire PUSCH (L) can have a value of 2, 4, 6, ..., 28. Here, the value of S + L must be equal to or less than 28. The formula for obtaining the SLIV that satisfies this condition is the same as Equation 6. Here, L = 2 * X can be obtained, and X can have a value of 1, 2, 3, ..., 14. This method can be used to schedule across slot boundaries by doubling the length obtained from Equation 3. In general, L = A * X can be obtained, where A is a natural number greater than or equal to 2.

[0478]

number

[0479] If Equation 6 is used, the SLIV analysis method is similar to Equation 3, and the SLIV is expressed using the same number of bits, which is advantageous in terms of overhead.

[0480] According to Equation 3, the SLIV can have a total of 14*15 / 2=105 values, which may be represented by 7 bits. Since 7 bits can represent 0, 1, ..., 127, the remaining 23 values ​​(127-105) according to Equation 3 are unused. In this case, the base station can perform scheduling across slot boundaries using the 23 unused values ​​of the SLIV. Specifically, when the SLIV is one of the 23 unused values, the values ​​of the position (S) and length (L) of the start symbol may be predetermined. For example, when the SLIV is one of the 23 values, S=7 and L=14 may be determined. The values ​​of S and L may be set / indicated by a higher layer.

[0481] Hereinafter, this specification describes a PUSCH repetition transmission scheme that combines mini-slot-level PUSCH repetition and multi-segment transmission schemes.

[0482] 23 to 26 are diagrams relating to PUSCH repeat transmission considering mini-slot-level PUSCH repeat transmission and multi-segment transmission according to an embodiment of the present invention.

[0483] i) Referring to FIG. 23, the base station transmits time domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repeat transmission of the PUSCH to the UE. The base station also transmits the number of repetitions (K). The UE determines the symbol in which the PUSCH repeat transmission is to be performed using the transmitted information. The next PUSCH repeat transmission is performed consecutively from the symbol immediately following the symbol in which the first PUSCH repeat transmission is performed. If one PUSCH repeat transmission crosses a slot boundary, the PUSCH repeat transmission may be divided based on the slot boundary. Furthermore, if one PUSCH repeat transmission overlaps with a DL symbol or SS / PBCH block configured in semi-static UL / DL configuration, the PUSCH repeat transmission may be performed in a symbol that does not overlap with the DL symbol. In this case, the UE may also exclude a flexible symbol immediately following the DL symbol configured in semi-static UL / DL configuration from the PUSCH repeat transmission. Referring to FIG. 23, when the index of the start symbol where the first PUSCH repeat transmission is performed is set to 4, the length is set to 4, and the number of repeat transmissions is set to 5, the third PUSCH repeat transmission crosses a slot boundary, so the third PUSCH repeat transmission is separated based on the slot boundary. This method may cause a problem in that the number of symbols included in one PUSCH repeat transmission is excessively small when the PUSCH repeat transmission is separated at the slot boundary. To solve this problem, the UE may not perform the PUSCH repeat transmission if the PUSCH repeat transmission is composed of only one symbol. If the PUSCH repeat transmission is composed of only one symbol, data other than the DM-RS cannot be transmitted in the corresponding symbol. Furthermore, if the number of symbols for the PUSCH repeat transmission is less than or equal to the number of DM-RS symbols to be transmitted in the PUSCH repeat transmission, the UE may not perform the PUSCH repeat transmission.

[0484] ii) Referring to FIG. 24, the base station transmits time domain resource allocation information (S: start symbol index, L: length) for PUSCH transmission to the UE. It also transmits the number of repetitions (K). The base station checks whether L*K symbols starting from the start symbol corresponding to S cross a slot boundary. If the slot boundary is not crossed, the first PUSCH repeat transmission may consist of L symbols starting from the start symbol, and the subsequent (K-1) PUSCH repeat transmissions may consist of L symbols starting from the symbol immediately following the symbol where the first PUSCH repeat transmission is performed. On the other hand, if a slot boundary is crossed, the UE may divide the PUSCH repeat transmission into L*K symbols based on the slot boundary. Referring to FIG. 24, if the index of the start symbol of the PUSCH is 4, the length is 4, and the number of repetitions is 5, 20 symbols starting from the symbol corresponding to index 4 cross the slot boundary, so the UE may divide the 20 symbols based on the slot boundary. Therefore, in FIG. 24, two PUSCH repeat transmissions may be performed.

[0485] iii) Referring to FIG. 25, the base station transmits time-domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repeat transmission of the PUSCH to the terminal. The base station then transmits the number of repetitions (K). The terminal determines the symbol for PUSCH repeat transmission using the transmitted information. Here, the next PUSCH repeat transmission is performed consecutively from the symbol immediately following the symbol for the first PUSCH repeat transmission. If one PUSCH repeat transmission crosses a slot boundary, the terminal does not transmit the PUSCH repeat. Furthermore, if one PUSCH repeat transmission overlaps with a symbol set as DL in a semi-static UL-DL configuration or an SS / PBCH block, the terminal does not transmit the PUSCH repeat. For example, in FIG. 25, the third PUSCH repeat transmission should be performed at symbols 12 and 13 of the first slot and symbols 0 and 1 of the second slot, but this crosses a slot boundary and is therefore not transmitted.

[0486] iv) Referring to FIG. 26, the base station transmits time domain resource allocation information (S: start symbol index, L: length) for the first PUSCH repeat transmission of the PUSCH to the UE. The base station also transmits the number of repetitions (K). The UE determines the symbol for PUSCH repeat transmission using the transmitted information. Here, the next PUSCH repeat transmission is performed consecutively from the symbol immediately following the symbol for the first PUSCH repeat transmission. If a symbol allocated to one PUSCH repeat transmission crosses a slot boundary, the UE may divide the symbol allocated to the PUSCH repeat transmission based on the slot boundary and include the divided symbols in adjacent PUSCH repeat transmissions in the same slot. If there are no adjacent PUSCH repeat transmissions in the same slot, the UE may perform PUSCH repeat transmissions using the symbol. For example, the symbols allocated to the third PUSCH repeat transmission in FIG. 26 (symbols 12 and 13 of the first slot and symbols 0 and 1 of the second slot) cross a slot boundary. Therefore, the slot boundaries can be separated by two symbols (symbols 12, 13 and symbols 0, 1), and the first two symbols may be included in the previous PUSCH repeat transmission, and the second two symbols may be included in the subsequent PUSCH repeat transmission.

[0487] FIG. 27 is a diagram illustrating repeated PUSCH transmission according to an embodiment of the present invention.

[0488] Referring to FIG. 27, the base station can further transmit information regarding symbols that cannot be used for PUSCH repeated transmission to the terminal. The terminal performs PUSCH repeated transmission using the transmission methods i) to iv) described above. However, if a symbol that cannot be used for PUSCH repeated transmission overlaps with a symbol to which the PUSCH repeated transmission is assigned, the symbol that cannot be used for PUSCH repeated transmission may be excluded from the PUSCH repeated transmission. Furthermore, if a symbol that cannot be used for PUSCH repeated transmission overlaps with a symbol to which the PUSCH repeated transmission is assigned, the terminal does not need to perform the PUSCH repeated transmission. Information regarding symbols that cannot be used for PUSCH repeated transmission may be configured in the terminal by an RRC signal. Furthermore, symbols that cannot be used for PUSCH repeated transmission are configured in the terminal by an RRC signal, and the RRC signal can indicate which symbols among the configured symbols that cannot be used for PUSCH repeated transmission are actually unusable for PUSCH repeated transmission. In addition, when a base station configures a UE using a time domain resource assignment (TDRA) table, symbols that cannot be used for PUSCH repeated transmission can be configured differently for each table entry. The UE is configured / instructed to configure / instruct one entry of the TDRA table configured by DCI, and can perform PUSCH repeated transmission using symbols that cannot be used for PUSCH repeated transmission configured in the corresponding entry.

[0489] Hereinafter, this specification will describe a method for determining the size of a transport block (TB) when performing PUSCH repetition transmission. According to 3GPP standard documents, the size of a TB may be proportional to the number of REs of resources to which a PUSCH is allocated. That is, a PUSCH to which more REs are allocated may have a larger TB size. However, as described above, the number of REs that can be used for each PUSCH repetition transmission may differ. For example, the first PUSCH repetition transmission may use two symbols, and the second PUSCH repetition transmission may use ten symbols. In this case, it is necessary to determine which number of REs should be used as a basis for determining the TB size.

[0490] First, this is a method of determining the size of the TB so that the first PUSCH is decodable. The reason for using PUSCH repeated transmission is to reduce delay time by quickly succeeding in decoding. Therefore, it is important that the first PUSCH is transmitted in a decodable manner. For this reason, the UE can determine the size of the TB based on the number of REs of the first PUSCH. The UE can determine the size of the TB based on the minimum number of REs corresponding to PUSCH repeated transmission with a redundancy version (RV) value of 0. However, when the TB size is determined based on the number of REs of the first PUSCH, the number of REs occupied by other PUSCHs is not taken into consideration, which may result in an optimal TB size being unable to be determined. For example, when the number of REs used for the first PUSCH transmission is greater than the number of REs used for the second PUSCH transmission, determining the TB size based on the number of REs used for the first PUSCH transmission may result in a higher code rate due to the smaller number of REs used for the second PUSCH transmission, which may lead to performance degradation.

[0491] Therefore, if the number of REs used for the first PUSCH repeat transmission is smaller than the average number of REs used for all repeat transmissions (i.e., the value obtained by dividing the number of REs used for all PUSCH repeat transmissions by the number of repetitions), the size of the TB is determined by the number of REs used for the first PUSCH repeat transmission; otherwise, the size of the TB is determined by the average number of REs used for all repeat transmissions. That is, if the size of the TB determined by the number of REs used for the first PUSCH repeat transmission is smaller than the average of the TB sizes determined by the numbers of REs used for all repeat transmissions (i.e., the value obtained by dividing the sum of the TB sizes determined by the numbers of REs used for each PUSCH repeat transmission by the number of repetitions), the size of the TB is determined by the number of REs used for the first PUSCH repeat transmission; otherwise, the size of the TB is determined by the average of the TB sizes determined by the numbers of REs used for all repeat transmissions.

[0492] Hereinafter, this specification will describe a method for analyzing scheduling information of a PDSCH or a PUSCH.

[0493] In order to indicate time and frequency domain allocation information of the PUSCH to the UE, the base station configures a set (or table) of possible PUSCH time domain allocation information using an RRC signal, and can indicate one piece of time domain allocation information from the configured set (or table) in a DCI scheduling the PUSCH. To configure a set (or table) of PUSCH time domain allocation information, the base station transmits a relative PUSCH start symbol index (S start ') and the length of PUSCH (L symbols ) can be expressed in SLIV using Equation 7 as follows:

[0494]

number

[0495] At this time, N symbolsis the number of symbols contained in the slot, which is 14.

[0496] The terminal uses the relative PUSCH start symbol index (S start ') to the index of the start symbol to which PUSCH is actually assigned (S start ) to S start =S start '+R, where R is the PUSCH start symbol index (S start is the reference symbol index value of S start The value is the index of the symbol in the slot where PUSCH transmission begins, and there are N symbols OFDM symbols are included, {0,1,…,N symbols It can have a value in the range {-1 -1}.

[0497] Hereinafter, the method for determining the R value will be described in this specification.

[0498] The terminal can always assume R = 0. That is, the index of the reference symbol can always be fixed as the first symbol of the slot. This is a method of making the first symbol in the symbol interval in which the actual PUSCH is transmitted the symbol corresponding to the symbol index indicated by the SLIV.

[0499] The SLIV may be calculated using Equation 8.

[0500]

number

[0501] S represents the start symbol of the PUSCH within a slot and has one of the values ​​0, 1, 2, ..., 13, and L is the number of symbols occupied by the PUSCH. When the PUSCH is configured to be transmitted repeatedly, L is the length of the first repeated transmission of the PUSCH. If L + S is less than or equal to 14 (in this case, the PUSCH is located within one slot), the same value as the SLIV in Rel-15 is used. If L + S is greater than 14 (in this case, the PUSCH is located across two slots), a value other than the SLIV value in Rel-15 is used. Therefore, SLIV values ​​for all combinations of S = 0, 1, ..., 13 and L = 1, 2, ..., 14 can be defined. The UE can determine the S and L values ​​from the SLIV value. The SLIV values ​​for Equation 8 are as shown in Table 5 below. In Table 5 below, the horizontal axis is S = 0, 1, ..., 13, and the vertical axis is L = 1, 2, ..., 14. The values ​​in the table are SLIV values.

[0502] [Table 5]

[0503] The UE can determine the value of R through semi-static DL / UL configuration. Semi-static DL / UL configuration means that the base station informs the UE whether each symbol in a slot is a symbol for downlink transmission (DL symbol) or a symbol for uplink transmission (UL symbol) using cell-specific RRC signaling and UE-specific RRC signaling. In this case, a symbol that is not designated as either a DL symbol or a UL symbol is a flexible symbol. A gap for UE DL / UL switching may be located in the flexible symbol. If the flexible symbol index starting immediately after the DL symbol in a slot to which the PUSCH is assigned is X, the UE can assume that the reference symbol index (R) of the PUSCH is X. That is, the UE can assume that the flexible symbol immediately after the DL symbol in the slot is the reference symbol index. On the other hand, if the flexible symbol index starting immediately after the DL symbol in a slot to which the PUSCH is assigned is X, the UE can assume that the reference symbol index (R) of the PUSCH is X+Y. Y may be a value indicating the number of symbols for a gap between DL transmission and UL transmission. The terminal may determine the number of symbols for the gap Y using a timing advance (TA) value and an OFDM symbol length, or may be set / configured by the base station. In this case, the value of Y may be 1 or 2.

[0504] The UE may determine the value of R according to the CORESET in which the PDCCH is received. Specifically, the UE may determine the value of R from the index of the OFDM symbol in which the CORESET in which the DCI for scheduling the PUSCH transmitted from the base station is received is located. Since the CORESET is a downlink signal, the PUSCH cannot be scheduled for the symbols corresponding to the CORESET. In addition, PUSCH transmission scheduling cannot be performed before the CORESET. Therefore, the symbol in which the UE can schedule PUSCH transmission earliest is the symbol immediately after the CORESET. Therefore, the index of the symbol immediately after the CORESET may be used as a reference symbol index for determining the start symbol of the PUSCH. For example, if the OFDM symbol index in which the CORESET in which the DCI for scheduling the PUSCH transmission begins is K and the length of the CORESET is D, the UE may determine the reference symbol index (R) as K+D. As another example, a gap for Rx-to-Tx switching is required for the UE to transmit the PUSCH immediately after receiving the CORESET. Therefore, the reference symbol index may be determined taking the gap into consideration. For example, if the OFDM symbol index at which the CORESET in which the DCI scheduling PUSCH transmission is received starts is K and the length of the CORESET is D, the UE may obtain the reference symbol index (R) as K+D+Y. Here, Y is the number of gap symbols and may be 1 or 2. When the UE is configured / instructed by the base station to transmit the PUSCH in the slot in which the PDCCH scheduling the PUSCH is received, the UE may determine the reference symbol index using the above-mentioned method. However, when the UE is configured / instructed by the base station to transmit the PUSCH in a slot other than the slot in which the PDCCH scheduling the PUSCH is received, the UE may assume R=0. That is, the UE may determine whether the slot to which the PUSCH is assigned is the same as the slot to which the PDCCH is assigned, and then determine the value of R.Furthermore, in order for the terminal to transmit the PUSCH immediately after receiving the CORESET, time is required to calculate the PUSCH. The minimum time required to calculate the PUSCH after receiving the PDCCH is the PUSCH preparation time (T). proc,2 ) In other words, the terminal does not expect PUSCH transmission to be configured / instructed by the base station before the PUSCH preparation time. Using this information, the terminal can determine the reference symbol index. For example, if the OFDM symbol index at which the CORESET in which the terminal receives DCI scheduling PUSCH transmission starts is K and the length of the CORESET is D, the terminal can determine the reference symbol index (R) as (K+D+T) mod N symbols where T is the PUSCH preparation time expressed in number of symbols mod N symbols The reason for performing the above is that the reference symbol index must be located within a slot and must have one of the values ​​0, 1, ..., 13. When PUSCH is scheduled in a slot that includes symbols from the symbol immediately after CORESET to the symbol after T symbols, the terminal calculates the reference symbol index (R) as (K+D+T) mod N. symbols and when a subsequent slot is indicated, the reference symbol index (R) can be assumed to be 0.

[0505] When the subcarrier spacing (SCS) of a cell in which a PDCCH is scheduled and a cell in which a PUSCH is scheduled are different, the values ​​of the symbol index K at which the CORESET begins and the length L of the CORESET may be ambiguous. For example, if the SCS (hereinafter referred to as SCS1) of a first cell in which a PDCCH is scheduled is greater than the SCS (hereinafter referred to as SCS2) of a second cell in which a PUCCH is scheduled, one symbol of the first cell overlaps with multiple symbols of the second cell. In this case, the symbol corresponding to the index (K) of the symbol in which the CORESET begins may be the first symbol of the second cell that overlaps with the symbol in which the CORESET of the first cell begins. The length of the second cell's symbols that overlap with the CORESET of the first cell can be calculated by multiplying the length of the CORESET of the first cell by SCS2 / SCS1. Specifically, if the length of one symbol in the first cell is T, the length of one symbol in the second cell is T*SCS2 / SCS1. Therefore, if the symbol interval including CORESET in the first cell is two symbols, the symbol interval in which PUCCH is scheduled in the second cell is 2*SCS2 / SCS1. For example, if SCS2 is 15 KHz and SCS1 is 30 KHz, the CORESET with a length of two symbols in the first cell overlaps with one symbol in the second cell (2*15 KHz / 30 KHz).

[0506] Hereinafter, this specification will describe the location of the DM-RS when the PUSCH is repeatedly transmitted. The time domain resource assignment (TDRA) field of the DCI that schedules the PUSCH can indicate the location of the DM-RS of the PUSCH in addition to the length of the PUSCH. When PUSCH mapping type A is indicated to the UE, the DM-RS of the PUSCH may be transmitted at a fixed position within a slot. When PUSCH mapping type B is indicated to the UE, the DM-RS of the PUSCH may be transmitted at the first symbol among the symbols to which the PUSCH is assigned. That is, when PUSCH mapping type B is indicated to the UE, the DM-RS may be transmitted at other symbols within a slot according to PUSCH scheduling.

[0507] Meanwhile, when a UE is configured / instructed by a base station to repeatedly transmit a PUSCH and PUSCH mapping type A is instructed, PUSCH mapping type A must transmit the DM-RS at a fixed position (symbol) of a slot. However, in mini-slot-level PUSCH repeated transmission, the symbol interval used for the first PUSCH repeated transmission includes a symbol where the DM-RS is located (mapped) and can transmit the DM-RS, but the symbol interval used for the second PUSCH repeated transmission may not include a symbol where the DM-RS is mapped. Therefore, when performing PUSCH repeated transmission, the UE needs to determine where the DM-RS should be mapped and transmitted. Hereinafter, a DM-RS transmission method will be described.

[0508] First, the first PUSCH repeat transmission is transmitted on a symbol to which the DM-RS is mapped according to PUSCH mapping type A, and the second and subsequent PUSCH repeat transmissions are transmitted by mapping the DM-RS to a symbol according to PUSCH mapping type B. In other words, the second and subsequent PUSCH repeat transmissions may transmit the DM-RS on the first symbol in which each PUSCH repeat transmission is performed.

[0509] The next method is a method in which, even though PUSCH mapping type A is instructed to the UE by DCI, the UE transmits DM-RS by regarding it as PUSCH mapping type B. The difference from the above method is that even in the first PUSCH repetition transmission, PUSCH mapping type B is followed, not PUSCH mapping type A.

[0510] FIG. 28 is a diagram illustrating a method for positioning DM-RS in PUSCH repeated transmission according to an embodiment of the present invention.

[0511] Next, if a PUSCH repeat transmission includes a DM-RS symbol according to PUSCH mapping type A, the DM-RS is transmitted according to mapping time A; otherwise, the DM-RS symbol is transmitted according to PUSCH mapping type B. Referring to FIG. 28(a), if a slot is composed of six symbols and the third symbol of each slot is the position where the DM-RS is mapped according to PUSCH mapping type A, the symbol intervals where the first PUSCH repeat transmission (symbol 0 to symbol 2 of the first slot) and the third PUSCH repeat transmission (symbol 0 to symbol 2 of the second slot) are performed include the DM-RS position according to mapping type A (the third symbol of the slot, i.e., symbol 2 of each slot), so the UE transmits the DM-RS in these symbols. The remaining symbol intervals where the second and fourth PUSCH repeat transmissions are performed do not include the DM-RS symbol, so the UE can transmit the DM-RS in the first symbol of the symbol intervals where PUSCH repeat transmissions are performed.

[0512] Next, for the first PUSCH repeat transmission, the DM-RS is transmitted using a DM-RS symbol according to PUSCH mapping type A, and for the second PUSCH repeat transmission and subsequent PUSCH repeat transmissions, the DM-RS is transmitted at the same position in the PUSCH as the first PUSCH repeat transmission. Referring to Figure 28(b), in the symbol interval in which the first PUSCH repeat transmission is performed, the DM-RS according to PUSCH mapping type A is located at the third symbol. Therefore, in subsequent PUSCH repeat transmissions, the DM-RS is similarly located at the third symbol in the symbol interval in which the PUSCH repeat transmission is performed. This is to position the DM-RS at equal intervals in the time domain in order to minimize channel estimation errors in a time conversion channel.

[0513] Hereinafter, this specification will describe the location of the DM-RS in the PUSCH according to the reference symbol index. The TDRA field of the DCI that schedules the PUSCH can indicate the location of the DM-RS in the PUSCH in addition to the length of the PUSCH. However, if the reference symbol index (R) is not fixed to 0, the symbol where the PUSCH is scheduled may not include the symbol where the DM-RS according to PUSCH mapping type A is located. Currently, in the 3GPP standard, R is always fixed to 0, so the PUSCH symbol indicated by the TDRA field that indicates PUSCH mapping type A and SLIV always includes the symbol where the DM-RS according to PUSCH mapping type A is located. Hereinafter, this specification will describe a method for determining the location where the DM-RS is mapped in the PUSCH.

[0514] i) If the PUSCH indicated by the reference symbol index includes a symbol to which the DM-RS according to PUSCH mapping type A is mapped, the DM-RS can be transmitted on that symbol, and if not, the DM-RS can be transmitted on the PUSCH mapping type B. That is, if the PUSCH determined by the reference symbol index does not include a symbol to which the DM-RS according to PUSCH mapping type A is located, the DM-RS can be transmitted on the first symbol of the PUSCH.

[0515] ii) When the base station instructs the terminal to use PUSCH mapping type A, the terminal always assumes R=0 (i.e., the symbol corresponding to the reference symbol index is the first symbol of the slot), and when the base station instructs the terminal to use PUSCH mapping type B, the terminal can determine R using the above-described method. By analyzing the reference symbol index differently depending on the PUSCH mapping type in this way, even if the base station instructs the terminal to use PUSCH mapping type A, there is no case where the symbol to which the DM-RS is mapped is not included.

[0516] Hereinafter, a method for determining a reference symbol index for a PDSCH will be described. As described above, a method for determining a reference symbol index (R) is also required for a downlink PDSCH, similar to the method for determining a reference symbol index for a PUSCH.

[0517] The UE may determine a reference symbol index of the PDSCH based on the CORESET. Specifically, the first symbol of the CORESET that receives the PDCCH that schedules the PDSCH may be the reference symbol index of the PDSCH. For example, if the first symbol of the CORESET that receives the PDCCH is the Rth symbol of a slot and the SLIV of the TDRA field of the PDCCH indicates S and L, the PDSCH may start from the R+Sth symbol of the slot and have a length of L.

[0518] Hereinafter, this specification will describe a method for determining a reference symbol index of a PDSCH when cross-carrier scheduling is indicated. If the SCS of a cell receiving a PDCCH is the same as the SCS of a cell receiving a PDSCH, the first symbol of the CORESET receiving the PDCCH may be determined as the reference symbol of the PDSCH. However, if the SCS of a cell receiving a PDCCH is different from the SCS of a cell receiving a PDSCH, the method described below may be considered.

[0519] FIG. 29 is a diagram illustrating a method for determining a reference symbol index of a PDSCH according to an embodiment of the present invention.

[0520] i) When the SCS of the cell that receives the PDCCH is different from the SCS of the cell that receives the PDSCH, the index of the previous symbol of the symbols of the cell that transmits the PDSCH and that overlaps with the first symbol of the CORESET of the PDCCH may be determined as the reference symbol index of the PDSCH. Figure 29(a) shows a case where the SCS of the cell that receives the PDCCH (DL cell #0) is smaller than that of the cell that receives the PDSCH (DL cell #1). The first symbol of the CORESET of the PDCCH and two symbols (A and B) of the cell that receives the PDSCH may overlap. In this case, the index of the previous symbol (A) of the two symbols may be determined as the reference symbol index of the PDSCH. If the first symbol of CORESET is symbol n of the slot of the cell that receives the PDCCH, the reference symbol index in the cell that receives the PDSCH is floor(n*2 u1-u0 )mod N symbol Here, the SCS of the cell where the PDCCH is received is 2 u1 kHz, and the SCS of the cell where the PDSCH is received is 2 u2 kHz and N symbol is the number of symbols contained in one slot.

[0521] ii) If the SCS of the cell that receives the PDCCH is different from the SCS of the cell that transmits the PDSCH, the latest symbol of the symbols of the cell that transmits the PDSCH and that overlaps with the first symbol of the CORESET of the PDCCH may be determined as the reference symbol index of the PDSCH. Figure 29(a) shows a case where the SCS of the cell that receives the PDCCH (DL cell #0) is smaller than that of the cell that receives the PDSCH (DL cell #1). The first symbol of the CORESET of the PDCCH and two symbols (A and B) of the cell that receives the PDSCH may overlap. In this case, the index of the latter of the two symbols (B) may be determined as the reference symbol index of the PDSCH. If the first symbol of CORESET is symbol n of the slot of the cell that receives the PDCCH, the reference symbol index in the cell that receives the PDSCH is ceil((n+1)*2 u1-u0 )-1 mod N symbol Here, the SCS of the cell where the PDCCH is received is 2 u1 kHz, and the SCS of the cell where the PDSCH is received is 2 u2 kHz and N symbol is the number of symbols contained in one slot.

[0522] iii) The above methods i) and ii) have a problem in that the index of a symbol that starts before the CORESET of the PDCCH may become the reference symbol index of the PDSCH. If the index of a symbol that starts before the CORESET of the PDCCH is the reference symbol index of the PDSCH, the UE must buffer the previous symbol. For example, Figure 29(b) shows a case where the SCS of the cell (DL cell #0) that receives the PDCCH is greater than that of the cell (DL cell #1) that receives the PDSCH. In this case, the first symbol of the CORESET overlaps with one symbol (A) of the cell that receives the PDSCH. If the above methods i) and ii) are applied, the index of symbol (A) is determined as the reference symbol index. However, because symbol A starts before the first symbol of the CORESET, the UE must perform buffering, which increases complexity.

[0523] Therefore, to solve this problem, the index of the first symbol among the symbols of a cell receiving a PDSCH that is not the first symbol of the CORESET of the PDCCH may be determined as the reference symbol index. In Figure 29(b), symbol A starts before the first symbol of CORESET, so the index of symbol A cannot be the reference symbol index. Therefore, the index of the next symbol B may be determined as the reference symbol index. Referring to Figure 29(a), the SCS of the cell (DL cell #0) receiving the PDCCH is smaller than that of the cell (DL cell #1) receiving the PDSCH, and in this case, symbol A starts at the same time as the first symbol of CORESET. Therefore, the index of this symbol A may be determined as the reference symbol index.

[0524] On the other hand, the method by which the UE determines the reference symbol index based on CORESET does not need to be applied in cross-carrier scheduling. That is, the UE does not expect an RRC configuration in which cross-carrier scheduling and the method by which the UE determines the reference symbol index based on CORESET are simultaneously applied. In other words, the UE can handle this as an error case.

[0525] Meanwhile, when cross-carrier scheduling is indicated, the UE may determine the first symbol index of a slot as a reference symbol index, and in the case of self-carrier scheduling (i.e., when the PDCCH and the PDSCH are transmitted in the same cell), the UE may determine the reference symbol index according to the above-mentioned methods i) to iii). Also, when cross-carrier scheduling is indicated and the SCS of the cell receiving the PDCCH is different from the SCS of the cell receiving the PDSCH, the UE may determine the first symbol index of a slot as a reference symbol index, and in the case of self-carrier scheduling or when the SCS of the cell receiving the PDCCH is the same as the SCS of the cell receiving the PDSCH, the UE may determine the reference symbol index according to the above-mentioned methods i) to iii).

[0526] The method for determining a reference symbol index of a PDSCH may be applied when the PDCCH and the PDSCH are received in the same slot. In other words, it may be applied when the number (K0) between the slot in which the PDCCH is received and the slot in which the PDSCH is scheduled to be received is 0. That is, if K0 is 0, the PDCCH and the PDSCH may be located in the same slot. In addition, the method for determining a reference symbol index of a PDSCH may be applied when PDSCH mapping type B is indicated (when the value of K0 is 0). In addition, the method for determining a reference symbol index of a PDSCH may be applied when the PDCCH and the PDSCH are received in the same slot (when the value of K0 is 0) and PDSCH mapping type B is indicated (when the value of K0 is 0). On the other hand, if the above method is not applied, the UE may determine the index of the first symbol of the slot as the reference symbol index of the PDSCH.

[0527] In the following, a method for determining the position of a DM-RS in a PDSCH using a reference symbol index will be described. The TDRA field of a DCI scheduling a PDSCH can indicate the position of the DM-RS in the PDSCH as well as the length of the PDSCH. However, if the reference symbol index (R) of the PDSCH is not fixed to 0, the symbols to which the DM-RS is mapped according to PDSCH mapping type A may not be included in the symbols to which the PDSCH is scheduled. Currently, in the 3GPP standard, R is always fixed to 0, so that the PDSCH symbols indicated by the TDRA field indicating PDSCH mapping type A and SLIV always include the symbols to which the DM-RS is mapped according to PDSCH mapping type A. In the present invention, it is necessary to determine where the DM-RS should be transmitted in the PDSCH.

[0528] If the PDSCH configured / indicated based on the reference symbol index includes a symbol on which the DM-RS according to PDSCH mapping type A should be transmitted, the DM-RS is transmitted on that symbol; otherwise, the DM-RS can be transmitted according to PDSCH mapping type B. That is, if the PDSCH configured / indicated based on the reference symbol index does not include a symbol on which the DM-RS according to PDSCH mapping type A should be transmitted, the DM-RS can be transmitted on the first symbol of the PDSCH.

[0529] In yet another embodiment of the present invention, when a terminal is instructed to use PDSCH mapping type A, the terminal always sets R=0 (i.e., assumes that the reference index is the first symbol of the slot), and can determine R according to the previous embodiment in the case of PDSCH mapping type B. In this way, by interpreting the reference index differently depending on the PDSCH mapping type, cases where a DM-RS symbol is not included in PDSCH mapping type A do not occur.

[0530] FIG. 30 is a flowchart illustrating an operation process in a terminal performing a method for transmitting a shared channel according to an embodiment of the present invention.

[0531] That is, the process in which the method (embodiment) explained in FIGS. 12 to 29 operates in the terminal is shown.

[0532] First, the terminal receives first resource information for transmitting and receiving a shared channel from the base station (S3001).

[0533] In this case, the first resource information may include a relative starting symbol index and a symbol length in a time domain resource for transmitting and receiving the shared channel.

[0534] Then, the terminal receives the shared channel from the base station on a first resource determined based on the first resource information, or transmits the shared channel to the base station on the first resource (S3002).

[0535] In this case, the starting symbol index of the first resource may be determined based on the relative starting symbol index and a previously defined reference symbol index.

[0536] The reference symbol index may be 0 or may be determined based on the starting symbol and length of the resource including the first resource information.

[0537] The first resource may be determined based on a first subcarrier spacing (SCS) of a first cell that includes the first resource information and a second SCS of a second cell that includes the shared channel.

[0538] In this case, if the first SCS and the second SCS are the same, the reference symbol index may be the index of the leading symbol among symbols including the first resource information of the first cell.

[0539] When the first SCS is smaller than the second SCS, the reference symbol index may be the index of the first symbol among the symbols including the shared channel of the second cell that overlap in the time domain with the symbol including the first resource information of the first cell.

[0540] If the first SCS is smaller than the second SCS, the reference symbol index may be the index of the last symbol among the symbols including the shared channel of the second cell that overlap in the time domain with the symbol including the first resource information of the first cell.

[0541] When the first SCS is greater than the second ...

Claims

1. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: A transmitter / receiver, a processor configured to control the transceiver; The processor: receiving resource information on a control channel; the resource information includes information regarding a symbol allocation length and a relative starting symbol index in the time domain for reception of a shared channel; receiving the shared channel on resources determined based on the resource information; The shared channel is received from a start symbol of the resource, and an index of the start symbol is determined based on a sum of the relative start symbol index and a reference symbol index; the reference symbol index is either 0 or an index of the earliest symbol among the symbols for monitoring the control channel based on whether a condition is met; The condition includes a case where a first subcarrier spacing (SCS) for receiving the control channel and a second SCS for receiving the shared channel are the same. A user equipment (UE) configured to:

2. The control channel is included in a first cell, The shared channel is included in a second cell. The UE of claim 1. When the condition is satisfied, the reference symbol index is the index of the earliest symbol among the symbols for monitoring the control channel, and when the condition is not satisfied, the reference symbol index is 0.

3. The UE according to claim 1 or 2.

4. The control channel is a physical downlink control channel; the shared channel is a physical downlink shared channel.

4. The UE according to claim 1 .

5. The resource information further includes information on a mapping type of the shared channel regarding a first position of a Demodulation-Reference Signal (DM-RS).

5. The UE according to any one of claims 1 to 4.

6. The method of claim 1, wherein the first position of the DM-RS is the earliest symbol in the resource. The UE of claim 5.

7. A method for use by a UE of a wireless communication system, said method comprising: receiving resource information on a control channel; the resource information includes information regarding a symbol allocation length and a relative starting symbol index in the time domain for reception of a shared channel; receiving the shared channel on resources determined based on the resource information; The shared channel is received from a start symbol of the resource, and an index of the start symbol is determined based on a sum of the relative start symbol index and a reference symbol index; the reference symbol index is either 0 or an index of the earliest symbol among the symbols for monitoring the control channel based on whether a condition is met; The condition includes a case where a first subcarrier spacing (SCS) for receiving the control channel and a second SCS for receiving the shared channel are the same. method.

8. The control channel is included in a first cell, The shared channel is included in a second cell. The method of claim 7.

9. When the condition is satisfied, the reference symbol index is the index of the earliest symbol among the symbols for monitoring the control channel, and when the condition is not satisfied, the reference symbol index is 0.

9. The method according to claim 7 or 8.

10. The control channel is a physical downlink control channel; the shared channel is a physical downlink shared channel.

10. The method according to any one of claims 7 to 9.

11. The resource information further includes information on a mapping type of the shared channel regarding a first position of a Demodulation-Reference Signal (DM-RS).

11. The method according to any one of claims 7 to 10.

12. The method of claim 11, wherein the first position of the DM-RS is the earliest symbol in the resource. The method of claim 11.

13. A base station configured to operate in a wireless communication system, the base station comprising: A transmitter / receiver, a processor configured to control the transceiver; The processor: transmitting resource information on a control channel; the resource information includes information regarding a symbol allocation length and a relative starting symbol index in the time domain for transmission of a shared channel; transmitting the shared channel on resources determined based on the resource information; The shared channel is transmitted from a start symbol of the resource, and an index of the start symbol is determined based on a sum of the relative start symbol index and a reference symbol index; the reference symbol index is either 0 or an index of the earliest symbol among the symbols for monitoring the control channel based on whether a condition is met; The condition includes a case where a first subcarrier spacing (SCS) for transmitting the control channel and a second SCS for transmitting the shared channel are the same. A base station configured to:

14. A method for use by a base station of a wireless communication system, said method comprising: transmitting resource information on a control channel; the resource information includes information regarding a symbol allocation length and a relative starting symbol index in the time domain for transmission of a shared channel; transmitting the shared channel on resources determined based on the resource information; The shared channel is transmitted from a start symbol of the resource, and an index of the start symbol is determined based on a sum of the relative start symbol index and a reference symbol index; the reference symbol index is either 0 or an index of the earliest symbol among the symbols for monitoring the control channel based on whether a condition is met; The condition includes a case where a first subcarrier spacing (SCS) for transmitting the control channel and a second SCS for transmitting the shared channel are the same. method.

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