Uplink transmission cancellation method, device, and system in wireless communication system

Abstract

To provide a method and a device for canceling uplink transmission in part or all of the resources allocated for uplink transmission using control information.SOLUTION: In a wireless communication system, a terminal receives radio resource control information (RRC) configuration information including information related to reception of a physical downlink control channel (PDCCH) including downlink control information (DCI) for uplink cancellation. The DCI includes an Uplink Cancellation Indicator (UL CI), the RRC configuration includes a Resource Indicator (RIV), the RIV is related to the index of the starting resource block (RB) and the number of consecutive RBs, the index is used to determine the index of the starting physical RB of the reference resource area, and the size of the bandwidth portion (BWP) used to determine the RIV is 275RB.SELECTED DRAWING: Figure 41

Description

[Technical Field]

[0001] The present invention relates to a wireless communication system, and more particularly to a method for canceling uplink transmission in a wireless communication system and an apparatus using the same. [Background technology]

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

[0003] The 3GPP (registered trademark) NR system improves network spectral efficiency, enabling carriers to provide more data and voice services within a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demands for high-speed data and media transmission, as well as high-capacity voice support. The advantages of the NR system include high throughput, low latency, support for frequency division duplex (FDD) and time division duplex (TDD) on the same platform, an improved end-user experience, and low operating costs due to a simple architecture.

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

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

[0006] Meanwhile, the Internet is evolving from a human-centered network where humans generate and consume information to the Internet of Things (IoT), a network where information is exchanged and processed among distributed components such as objects. IoE (Internet of Everything) technology, which combines big data processing technology using connections with cloud servers, is also emerging. To realize the IoT, technological elements such as sensing technology, wired and wireless communications and network infrastructure, service interface technology, and security technology are required. Recent research has focused on sensor networks for connecting things, machine-to-machine (M2M) communication, and machine-type communication (MTC). In an IoT environment, intelligent IT (internet technology) services can be provided that create new value in people's lives by collecting and analyzing data generated by connected objects. By integrating and combining existing IT (information technology) with various industries, the IoT can be applied to areas such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0007] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and MTC (machine-type communication) are being implemented using 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud radio access network (cloud RAN), the aforementioned big data processing technology, can also be considered an example of the integration of 5G and IoT technologies. Mobile communication systems were generally developed to provide voice services while ensuring user activity.

[0008] However, mobile communication systems have gradually expanded their scope to include data services in addition to voice, and have now developed to the level where they can provide high-speed data services. However, due to resource shortages in currently available mobile communication systems and users' demands for high-speed services, there is a demand for more advanced mobile communication systems. Summary of the Invention [Problem to be solved by the invention]

[0009] An object of one embodiment of the present invention is to provide a method for canceling uplink transmission in some or all of the resources allocated for uplink transmission using control information, and an apparatus using the same. [Means for solving the problem]

[0010] In a wireless communication system, a terminal transmitting an uplink shared channel (PUSCH) to a base station includes a communication module; and a processor controlling the communication module, wherein the processor receives configuration information for receiving a physical downlink control channel (PDCCH), and receives the PDCCH including downlink control information (DCI) based on the configuration information, the DCI including an indicator indicating some or all of time-frequency resources for cancellation of uplink transmission, and the subcarrier spacing of at least one symbol for which the indicator indicates cancellation of the uplink transmission is determined to be the subcarrier spacing of a downlink bandwidth part (DL BWP) of a cell in which the DCI is received.

[0011] In addition, in the present invention, the time-frequency resource for canceling the uplink transmission is a resource obtained by excluding a specific resource from a reference resource region, and the number of symbols in the reference resource region is determined based on a monitoring period for monitoring the PDCCH or a pre-set value.

[0012] In addition, in the present invention, the specific resource includes one or more symbols of a physical broadcast channel (PBCH) / synchronization signal (SS) symbol and / or a downlink symbol.

[0013] In addition, in the present invention, the downlink symbol is a symbol configured to be common to all cells.

[0014] In addition, in the present invention, the symbols for the physical broadcast channel (PBCH) / synchronization signal (SS) are symbols configured in common across cells.

[0015] In addition, in the present invention, the start symbol of the reference resource region is a symbol located 'X' symbols after the symbol at which the PDDCH is received.

[0016] In addition, in the present invention, the value of 'X' is determined based on at least one of a first subcarrier spacing and / or a second subcarrier spacing, the first subcarrier spacing being the minimum value of the subcarrier spacing for the PDCCH and the subcarrier spacing for the uplink transmission, and the second subcarrier spacing being a value determined based on the subcarrier spacing for the uplink transmission.

[0017] In addition, in the present invention, the time-frequency resource for canceling the uplink transmission is composed of a plurality of regions, each of which is indicated as being cancelled by a plurality of bits of the indicator.

[0018] In addition, in the present invention, the time-frequency resource for canceling the uplink transmission is composed of N groups each including at least one symbol on the time axis and a plurality of regions divided into at least one physical resource block (PRB) on the frequency axis.

[0019] In addition, in the present invention, the number of the at least one symbol included in at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result, and the number of the at least one symbol included in each of the remaining groups other than the at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result.

[0020] In addition, in the present invention, the configuration information includes a resource indication value indicating the index of the starting PRB of the reference resource area and the number of consecutive RBs, and the BWP including at least one PRB indicated by the RIV includes 275 RBs.

[0021] Also, in the present invention, the index value of the start PRB of the at least one PRB is a value obtained by adding an offset value to the index value of the start PRB in the reference resource region.

[0022] In addition, in the present invention, the offset value and the subcarrier spacing of the offset value are transmitted by higher layer signaling.

[0023] In addition, in the present invention, the resource cancelled by the indicator is a resource for transmitting a physical uplink shared channel (PUSCH) and / or a sounding reference signal (SRS).

[0024] In addition, in the present invention, the cyclic prefix (CP) of the at least one symbol indicated by the indicator is determined to be the CP of the downlink bandwidth part (DL BWP) of the cell from which the DCI is transmitted.

[0025] In addition, in the present invention, resources for the uplink transmission are allocated before the PDCCH including the indicator is received, and the uplink transmission in a resource region of the resources that overlaps with the at least one symbol is canceled.

[0026] The present invention also provides a method comprising: receiving configuration information for receiving a physical downlink control channel (PDCCH); and receiving the PDCCH including downlink control information (DCI) based on the configuration information, wherein the DCI includes an indicator indicating some or all of time-frequency resources for cancellation of uplink transmission, and wherein a subcarrier spacing of at least one symbol for which cancellation of the uplink transmission is indicated by the indicator is determined to be a subcarrier spacing of a downlink bandwidth part (DL BWP) of a cell from which the DCI is received. [Effects of the Invention]

[0027] According to an embodiment of the present invention, a terminal can receive an indicator for canceling uplink transmission and can cancel uplink transmission according to the indicator, thereby preventing the terminal from performing unnecessary uplink transmission, thereby saving energy of the terminal and avoiding interference to other terminals and the base station.

[0028] The effects obtained from the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a wireless communication system. [Figure 2] 1 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] 1 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channels. [Figure 4] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5] FIG. 1 illustrates a procedure for control information and control channel transmission in a 3GPP NR system. [Figure 6] A diagram showing a CORESET in which PDCCH is transmitted in a 3GPP NR system. [Figure 7] A diagram showing a method for setting a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 8 is a conceptual diagram illustrating carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining terminal carrier communication and multi-carrier communication. [Figure 10] A diagram showing an example in which a cross-carrier scheduling technique is applied. [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. [Figure 12] 10 illustrates an example of a method for receiving an indicator for revoking resources allocated for uplink transmission according to an embodiment of the present invention. [Figure 13] 1 is a flowchart illustrating an example of a method for revoking allocated resources for uplink transmission according to an embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing a preemption indicator used in a wireless communication system according to an embodiment of the present invention. [Figure 15] 10 is a diagram showing the range of physical uplink data channels that a wireless communication terminal according to an embodiment of the present invention cannot transmit due to preemption. FIG. [Figure 16] FIG. 10 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention to transmit a PUSCH that could not be transmitted due to preemption. [Figure 17] FIG. 10 is a diagram showing the range of physical uplink data channels that a wireless communication terminal according to yet another embodiment of the present invention cannot transmit due to preemption. [Figure 18] 10 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention to transmit a DMRS and UCI that could not be transmitted due to preemption. [Figure 19] FIG. 2 illustrates an example of resources indicated by preemption according to an embodiment of the present invention. [Figure 20] FIG. 10 is a diagram illustrating yet another example of resources indicated by preemption according to an embodiment of the present invention. [Figure 21] FIG. 10 is a diagram illustrating yet another example of resources indicated by preemption according to an embodiment of the present invention. [Figure 22] FIG. 10 is a diagram illustrating yet another example of resources indicated by preemption according to an embodiment of the present invention. [Figure 23] FIG. 10 is a diagram illustrating yet another example of resources indicated by preemption according to an embodiment of the present invention. [Figure 24] FIG. 10 is a diagram illustrating yet another example of resources indicated by preemption according to an embodiment of the present invention. [Figure 25] FIG. 1 illustrates an example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention. [Figure 26] FIG. 10 illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention. [Figure 27] FIG. 10 illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention. [Figure 28] FIG. 10 illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention. [Figure 29] FIG. 1 illustrates an example of a method for determining resources indicated by preemption according to an embodiment of the present invention. [Figure 30]FIG. 10 illustrates yet another example of a method for determining resources indicated by preemption according to an embodiment of the present invention. [Figure 31] FIG. 10 illustrates yet another example of a method for determining resources indicated by preemption according to an embodiment of the present invention. [Figure 32] FIG. 10 is a diagram illustrating an example of receiving multiple preemptions according to an embodiment of the present invention. [Figure 33] FIG. 10 is a diagram illustrating yet another example of a case where a plurality of preemptions are received according to an embodiment of the present invention. [Figure 34] FIG. 10 is a diagram illustrating yet another example of a case where a plurality of preemptions are received according to an embodiment of the present invention. [Figure 35] FIG. 10 is a diagram illustrating an example of a method for dividing the time-frequency domain of resources indicated by preemption according to an embodiment of the present invention. [Figure 36] FIG. 10 is a diagram illustrating yet another example of a method for dividing the time-frequency domain of resources indicated by preemption according to an embodiment of the present invention. [Figure 37] FIG. 10 illustrates an example of a PRB indicated by preemption according to an embodiment of the present invention. [Figure 38] FIG. 2 is a diagram illustrating an example of a method for determining subcarrier spacing for an uplink according to an embodiment of the present invention. [Figure 39] FIG. 10 is a diagram illustrating yet another example of a method for determining subcarrier spacing for an uplink according to an embodiment of the present invention. [Figure 40] 10 is a diagram illustrating an example of a method for determining an offset value according to a subcarrier spacing supported in an uplink according to an embodiment of the present invention. [Figure 41] 10 is a flowchart illustrating an example of a terminal operation according to an embodiment of the present invention. [Figure 42] 10 is a flowchart illustrating an example of a base station operation according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The terms used in this specification are generally used as widely as possible, taking into consideration the functions of the present invention. However, these may vary depending on the intentions of those skilled in the art, practice, or the emergence of new technologies. In addition, in certain cases, the applicant may arbitrarily select terms. In such cases, the meaning of the terms will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be interpreted based on the substantive meaning of the terms and the overall content of this specification, rather than simply the names of the terms.

[0031] Throughout this specification, when a component is said to be "connected" to another component, this includes not only "directly connected" but also "electrically connected" through other components in between. Furthermore, when a component is said to "comprise" a specific component, this does not mean excluding the other component, but also means including the other component, unless otherwise specified to the contrary. In addition, limitations such as "more than" or "less than" based on a specific threshold may be appropriately replaced with "more than" or "less than," respectively, depending on the embodiment.

[0032] The following technologies are used in various wireless access systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA is implemented in radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented in radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA is implemented in radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, and E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP LTE (Long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A and is a system for supporting eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. For clarity of explanation, the following description will focus on 3GPP NR, but the technical concept of the present invention is not limited thereto.

[0033] Unless otherwise specified herein, the base station may include a next generation node B (gNB) defined in 3GPP NR. Also, unless otherwise specified, the terminal may include a user equipment (UE). Hereinafter, to facilitate understanding of the description, each content will be described as a separate embodiment, but each embodiment may be used in combination with each other. In this disclosure, "configuring" a terminal may mean configuration by a base station. Specifically, the base station may transmit a channel or a signal to the terminal to configure the operation of the terminal or parameter values ​​used in the wireless communication system.

[0034] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a radio communication system.

[0035] Referring to FIG. 1, a radio frame used in a 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100)*Tc). Each radio frame consists of 10 equally sized subframes (SF). Here, Δfmax=480*103 Hz, Nf=4096, Tc=1 / (Δfref*Nf,ref), Δfref=15*103 Hz, and Nf,ref=2048. The 10 subframes in a frame are numbered 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots depending on the subcarrier spacing. More specifically, the subcarrier spacing that can be used in a 3GPP NR system is 15*2 μkHz. μ is the subcarrier spacing configuration factor and has values ​​from 0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. A 1 ms long subframe consists of 2μ slots, each of which is 2-μms long. The 2μ slots in one subframe are numbered from 0 to 2μ-1. The slots in one radio frame are numbered from 0 to 10*2μ-1. Time resources are divided by at least one of the radio frame number (also called radio frame index), subframe number (also called subframe index), and slot number (or slot index).

[0036] 2 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system, particularly illustrating a resource grid structure in a 3GPP NR system.

[0037] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes multiple OFDM symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also refers to one symbol interval. Unless otherwise specified, an OFDM symbol is simply referred to as a symbol. Hereinafter, the term "symbol" includes OFDM symbols, SC-FDMA symbols, DFTs-OFDM symbols, etc. Referring to FIG. 2, a signal transmitted from each slot is represented by a resource grid consisting of Nsize, μgrid, x*NRBSC subcarriers, and Nslotsymb OFDM symbols. Here, x=DL for the downlink resource grid and x=UL for the uplink resource grid. Nsize, μgrid, and x denote the number of resource blocks (RBs) according to the subcarrier spacing factor μ (x is DL or UL), and Nslotsymb denotes the number of OFDM symbols in a slot. NRBSC is the number of subcarriers constituting one RB, and NRBSC=12. Depending on the multiple access method, the OFDM symbol is called a cyclic prefix OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-S-OFDM) symbol.

[0038] The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, a normal CP includes 14 OFDM symbols, while an extended CP includes 12 OFDM symbols. In a specific embodiment, the extended CP is used only with a subcarrier spacing of 60 kHz. For convenience of explanation, FIG. 2 illustrates a case where one slot consists of 14 OFDM symbols. However, the present invention is equally applicable to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, and x*NRBSC subcarriers in the frequency domain. Subcarriers are classified into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0039] One RB is defined by NRBSC (e.g., 12) consecutive subcarriers in the frequency domain. Incidentally, a resource consisting of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB consists of Nslotsymb*NRBSC resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) within one slot. k is an index ranging from 0 to Nsize, μgrid, x*NRBSC-1 in the frequency domain, and l is an index ranging from 0 to Nslotsymb-1 in the time domain.

[0040] In order for a terminal to receive a signal from a base station or transmit a base station signal, the time / frequency synchronization of the terminal must be aligned with the time / frequency synchronization of the base station, because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters required to demodulate DL signals and transmit UL signals at the correct time.

[0041] Each symbol in a radio frame operating in time division duplex (TDD) or unpaired spectrum consists of at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. A radio frame operating on a downlink carrier in frequency division duplex (FDD) or paired spectrum consists of downlink symbols or flexible symbols, and a radio frame operating on an uplink carrier consists of uplink symbols or flexible symbols. A downlink symbol allows downlink transmission but not uplink transmission, and an uplink symbol allows uplink transmission but not downlink transmission. Whether a flexible symbol is used for downlink or uplink is determined depending on the signal.

[0042] Information about the type of each symbol, i.e., information indicating any one of downlink symbols, uplink symbols, and flexible symbols, is formed by a cell-specific (or common) RRC signal. The information about each symbol type is additionally formed by a UE-specific (or dedicated) RRC signal. The base station uses the cell-specific RRC signal to notify i) the period of the cell-specific slot configuration, ii) the number of slots having only downlink symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of downlink symbols from the first symbol in the slot immediately following the slot having only downlink symbols, iv) the number of slots having only uplink symbols from the end of the period of the cell-specific slot configuration, and v) the number of uplink symbols from the last symbol in the slot immediately preceding the slot having only uplink symbols. Here, symbols that are not configured as either uplink or downlink symbols are flexible symbols.

[0043] If the information regarding the symbol type consists of the UE-specific RRC signal, the base station signals, via the cell-specific RRC signal, whether the flexible symbol is a downlink symbol or an uplink symbol. At this time, the UE-specific RRC signal cannot change the downlink symbol or uplink symbol consisting of the cell-specific RRC signal to another symbol type. The per-UE RRC signal signals, for each slot, the number of downlink symbols among the Nslotsymb symbols of the slot and the number of uplink symbols among the Nslotsymb symbols of the slot. At this time, the downlink symbols of the slot are continuously configured from the first symbol to the i-th symbol of the slot. Also, the uplink symbols of the slot are continuously configured from the j-th symbol to the last symbol of the slot (where i < j). In a slot, a symbol not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0044] The type of symbol configured by the above RRC signal can be called a semi-static DL / UL configuration. In the previously described semi-static DL / UL configuration configured by the RRC signal, a flexible symbol may be indicated as a downlink symbol, an uplink symbol, or a flexible symbol by the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, a downlink symbol or an uplink symbol configured by the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI that the base station can indicate to the UE.

[0045]

Table 1

[0046] In Table 1, D represents a downlink symbol, U represents an uplink symbol, and X represents a flexible symbol. As shown in Table 1, up to two DL / UL switchings may be allowed in one slot.

[0047] FIG. 3 is a diagram illustrating physical channels used in a 3GPP system (for example, NR) and a general signal transmission method using the physical channels.

[0048] When a terminal is powered on or newly enters a cell, the terminal performs an initial cell search (S101). Specifically, the terminal synchronizes with a base station during the initial cell search. To do this, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Next, the terminal receives a physical broadcast channel from the base station to acquire broadcast information within the cell.

[0049] After completing the initial cell search, the terminal receives a physical downlink shared channel (PDSCH) via a physical downlink control channel (PDCCH) and information carried on the PDCCH to acquire more detailed system information than that acquired through the initial cell search (S102). Here, the system information transmitted to the terminal is cell-common system information for the terminal to operate correctly in a physical layer in Radio Resource Control (RRC), and is called remaining system information or system information block (SIB) 1.

[0050] When a terminal first connects to a base station or when there are no radio resources for signal transmission (when the terminal is in RRC_IDLE mode), the terminal can perform a random access procedure with the base station (steps S103 to S106). First, the terminal transmits a preamble on a physical random access channel (PRACH) (S103) and can receive a response message for the preamble from the base station on a PDCCH and a corresponding PDSCH (S104). If the terminal receives a valid random access response message, the terminal transmits data including its own identifier, etc. to the base station on a physical uplink shared channel (PUSCH) indicated by an uplink grant transmitted from the base station on the PDCCH (S105). Next, the terminal waits for reception of a PDCCH as instructed by the base station to resolve collisions. If the terminal successfully receives the PDCCH with its own identifier (S106), the random access procedure ends. During the random access procedure, the terminal can acquire terminal-specific system information required for the terminal to operate correctly in the physical layer of the RRC layer. If the terminal acquires the terminal-specific system information in the RRC layer, the terminal enters the RRC connected mode (RRC_CONNECTED mode).

[0051] The RRC layer is used to generate and manage messages for control between a terminal and a radio access network (RAN). Furthermore, the base station and terminal can broadcast cell system information required for all terminals in the cell, manage paging message transmission, manage mobility and handover, report terminal measurements and related control, and manage and store terminal capabilities 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 the RRC configuration can be maintained unchanged for a long period.

[0052] After the above procedures, the UE receives a PDCCH / PDSCH (S107) and transmits a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general uplink / downlink signal transmission procedure. In particular, the UE receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the UE. The format of the DCI may vary depending on the purpose of use. The uplink control information (UCI) transmitted by the UE to the base station via the uplink includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI are included in channel state information (CSI). In the case of a 3GPP NR system, the UE transmits control information such as the above-mentioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0053] FIG. 4 is a diagram illustrating an SS / PBCH block for initial cell access in a 3GPP NR system.

[0054] When a terminal is powered on or attempts to access a new cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. During the cell search process, the terminal detects the cell's physical cell identity (NcellID). To do this, the terminal receives synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station to synchronize with the base station. At this time, the terminal obtains information such as a cell identity (ID).

[0055] The synchronization signal (SS) will be described in more detail with reference to Figure 4(a). The synchronization signal is divided into a PSS and an SSS. The PSS is used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS is used to obtain frame synchronization and a cell group ID. Referring to Figure 4(a) and Table 2, an SS / PBCH block consists of 20 consecutive RBs (=240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol via subcarriers 56 to 182. Here, the lowest subcarrier index in the SS / PBCH block starts from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, i.e., 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 signals.

[0056] [Table 2]

[0057] The SS groups a total of 1008 unique physical layer cell IDs (physical layer cell IDs) into 336 physical layer cell ID groups, each containing three unique identifiers, through a combination of three PSSs and SSSs. Specifically, each physical layer cell ID is part of only one physical layer cell ID group. Thus, the physical layer cell ID NcellID=3N(1)ID+N(2)ID is uniquely defined by an index N(1)ID ranging from 0 to 335 indicating a physical layer cell ID group and an index N(2)ID ranging from 0 to 2 indicating a physical layer identifier within the physical layer cell ID group. The UE detects the PSS and identifies one of the three unique physical layer identifiers. The UE also detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical layer identifier. In this case, the PSS sequence dPSS(n) is expressed as follows:

[0058]

number

[0059] Here, [Formula 2],

[0060]

number

[0061] It is given as [Formula 3].

[0062]

number

[0063] Also, the sequence of SSS SSS (n) is as shown in the following [Equation 4].

[0064]

number

[0065] Here, [Formula 5],

[0066]

number

[0067] It is given as [Formula 6].

[0068]

number

[0069] A 10-ms radio frame is divided into two 5-ms half-frames. Referring to FIG. 4(b), the slots in which SS / PBCH blocks are transmitted within each half-frame are described. The slots in which SS / PBCH blocks are transmitted are either Cases A, B, C, D, or E. In Case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n symbol. Here, n = 0 or 1 for carrier frequencies below 3 GHz. Also, n = 0, 1, 2, or 3 for carrier frequencies above 3 GHz and below 6 GHz. In Case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n symbol. Here, n = 0 for carrier frequencies below 3 GHz. Also, n = 0 or 1 for carrier frequencies above 3 GHz and below 6 GHz. In Case C, the subcarrier spacing is 30 kHz and the start of the SS / PBCH block is {2, 8}+14*n symbols, where n=0, 1 for carrier frequencies below 3 GHz. For carrier frequencies above 3 GHz and below 6 GHz, n=0, 1, 2, 3. In Case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is {4, 8, 16, 20}+28*n symbols, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz. In Case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n symbols. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies above 6 GHz.

[0070] 5 is a diagram showing a procedure for transmitting control information and a control channel in a 3GPP NR system. Referring to FIG. 5(a), a base station adds a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., DCI) S202. The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more terminals includes at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). The UE-specific RNTI includes at least one of a cell temporary RNTI (C-RNTI), a CS-RNTI, or an MCS-C-RNTI. The base station then performs channel encoding (e.g., polar coding) S204 and rate-matching S206 according to the amount of resource(s) used for PDCCH transmission. The base station then multiplexes DCI(s) based on a CCE (control channel element)-based PDCCH structure S208. The base station then applies additional processes S210, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI(s) and maps them to resources to be transmitted. A CCE is the basic resource unit for the PDCCH, and one CCE consists of multiple (e.g., six) resource element groups (REGs). One REG consists of multiple (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as the aggregation level. 3GPP NR systems use aggregation levels of 1, 2, 4, 8, or 16.FIG. 5(b) is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region accordingly.

[0071] FIG. 6 is a diagram illustrating a control resource set (CORESET) in which a physical downlink control channel (PDCCH) is transmitted in a 3GPP NR system.

[0072] A CORESET is a time-frequency resource over which a PDCCH, a control signal for a terminal, is transmitted. A search space, which will be described later, is mapped to one CORESET. Therefore, a terminal does not monitor all frequency bands to receive a PDCCH, but rather monitors a time-frequency region designated as a CORESET and decodes the PDCCH mapped to the CORESET. A base station configures one or more CORESETs for each cell of a terminal. A CORESET consists of up to three consecutive symbols on the time axis. A CORESET also consists of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 consists of consecutive PRBs, and CORESET#2 and CORESET#3 consist of non-consecutive PRBs. A CORESET can be located at any symbol within a slot. For example, in the embodiment of FIG. 5, CORESET#1 starts from the first symbol of the slot, CORESET#2 starts from the fifth symbol of the slot, and CORESET#9 starts from the ninth symbol of the slot.

[0073] FIG. 7 is a diagram illustrating a method for configuring a PDCCH search space in a 3GPP NR system.

[0074] At least one search space exists in each CORESET for transmitting a PDCCH to a terminal. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter referred to as PDCCH candidates) on which the PDCCH of the terminal is transmitted. The search space includes a common search space that all 3GPP NR terminals should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in a cell belonging to the same base station monitor a PDCCH that is configured to be commonly searched. In addition, the terminal-specific search space is configured for each terminal so that the PDCCH allocated to each terminal is monitored at a different search space position depending on the terminal. In the case of a terminal-specific search space, the search spaces allocated to terminals may partially overlap due to the limited control region to which the PDCCH is allocated. Monitoring the PDCCH includes blind decoding of PDCCH candidates in the search space. If blind decoding is successful, the PDCCH is said to be (successfully) detected / received, and if blind decoding fails, the PDCCH is said to be undetected / unreceived or not successfully detected / received.

[0075] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals to transmit downlink control information to one or more terminals is referred to as a group common (GC) PDCCH or a common PDCCH. Also, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal to transmit uplink scheduling information or downlink scheduling information to one specific terminal is referred to as a terminal-specific PDCCH. The common PDCCH is included in a common search space, and the terminal-specific PDCCH is included in the common search space or the terminal-specific PDCCH.

[0076] A base station notifies each terminal or a group of terminals of information regarding resource allocation of transmission channels, a paging channel (PCH) and a downlink-shared channel (DL-SCH) (i.e., DL Grant) or information regarding resource allocation of a UL-SCH and hybrid automatic repeat request (HARQ) (i.e., UL Grant) via a PDCCH. The base station transmits PCH transport blocks and DL-SCH transport blocks via a PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. In addition, terminals receive data excluding specific control information or specific service data via the PDSCH.

[0077] The base station transmits information on which terminal (one or more terminals) the PDSCH data is transmitted to and how the terminal should receive and decode the PDSCH data, by including the information in the PDCCH. For example, assume that DCI transmitted over a specific PDCCH is CRC masked with RNTI "A," and the DCI indicates that the PDSCH is allocated to radio resource "B" (e.g., frequency location), and indicates transmission format information "C" (e.g., transmission block size, modulation scheme, coding information, etc.). The terminal monitors the PDCCH using its own RNTI information. In this case, if there is a terminal that blind decodes the PDCCH using RNTI "A," the terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0078] Table 3 shows an example of a PUCCH used in a wireless communication system.

[0079] [Table 3]

[0080] The PUCCH is used to transmit the following uplink control information (UCI):

[0081] - SR (Scheduling Request): Information used to request uplink UL-SCH resources.

[0082] HARQ-ACK: A response to a PDCCH (indicating DL SPS release) and / or a response to an uplink transport block (TB) on a PDSCH. HARQ-ACK indicates receipt of information transmitted via a PDCCH or PDSCH. HARQ-ACK responses include a positive ACK (simply referred to as ACK), a negative ACK (hereinafter referred to as NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. Generally, an ACK is represented by a bit value of 1, and a NACK is represented by a bit value of 0.

[0083] CSI: Feedback information for the downlink channel. It is generated by the terminal based on the CSI-RS (Reference Signal) transmitted by the base station. MIMO (multiple input multiple output)-related feedback information includes RI and PMI. CSI is divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0084] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios, various channel environments, and frame structures.

[0085] PUCCH format 0 is a format that transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted using one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted using two OFDM symbols, the same sequence is transmitted in two symbols using different RBs. This allows the UE to obtain frequency diversity gain. More specifically, the UE determines a cyclic shift value mcs according to the Mbit-bit UCI (Mbit = 1 or 2), cyclically shifts a 12-length base sequence by the determined mcs value, maps the resulting sequence to one OFDM symbol and 12 REs of one PRB, and transmits it. If the number of cyclic shifts available to the UE is 12 and Mbit = 1, 1-bit UCIs 0 and 1 are represented by sequences corresponding to two cyclic shifts with a cyclic shift value difference of 6. Also, if Mbit=2, then 2-bit UCI 00, 01, 11, 10 is represented by a sequence corresponding to four cyclic shifts with a difference of three between the cyclic shift values.

[0086] 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, UCI with Mbit=1 is modulated using BPSK. The UE modulates UCI with Mbit=2 using quadrature phase shift keying (QPSK). A signal is obtained by multiplying the modulated complex-valued symbol d(0) with a sequence of length 12. In this case, the sequence may be the base sequence used for PUCCH format 0. The UE spreads the obtained signal using an orthogonal cover code (OCC) on the even-numbered OFDM symbols to which PUCCH format 1 is assigned and transmits it. In PUCCH format 1, the maximum number of different UEs multiplexed in the same RB can be determined depending on the length of the OCC used. In odd-numbered OFDM symbols of PUCCH format 1, a demodulation reference signal (DMRS) is spread by OCC and mapped.

[0087] PUCCH format 2 carries UCI exceeding 2 bits. PUCCH format 2 is transmitted using one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted using two OFDM symbols, the same sequence is transmitted using different RBs across the two OFDM symbols. This allows the UE to obtain frequency diversity gain. More specifically, Mbit UCI (Mbit>2) is bit-level scrambled, QPSK modulated, and mapped to the RBs of one or two OFDM symbols. Here, the number of RBs is one of 1 to 16.

[0088] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted using 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 is one of 4 to 14. Specifically, the terminal modulates Mbit-bit UCI (Mbit>2) using π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(Msymb-1). Here, Msymb=Mbit when π / 2-BPSK is used, and Msymb=Mbit / 2 when QPSK is used. The terminal does not apply block-wise spreading to PUCCH format 3. However, the terminal may apply block-wise spreading to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length -12 so that PUCCH format 4 has a multiplexing capacity of 2 or 4. The terminal transmit precoding (or DFT-precoding) the spreaded signal, maps it to each RE, and transmits the spreaded signal.

[0089] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via the PUCCH. If the number of RBs that the terminal can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the terminal does not transmit some UCI information and transmits only the remaining UCI information according to the priority of the UCI information.

[0090] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped is configured via RRC signaling. If PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor(N / 2) OFDM symbols, and the second hop has ceil(N / 2) OFDM symbols.

[0091] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted is configured by an RRC signal. The repeatedly transmitted PUCCH should start from the same OFDM symbol position in each slot and have the same length. If the RRC signal indicates that any one of the OFDM symbols in a slot in which the UE should transmit the PUCCH is a DL symbol, the UE does not transmit the PUCCH from that slot but postpones its transmission to the next slot.

[0092] Meanwhile, in a 3GPP NR system, a terminal transmits and receives using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal is configured with a bandwidth part (BWP) consisting of a continuous portion of the carrier bandwidth. A terminal operating according to TDD or using an unpaired spectrum is configured with up to four DL / UL BWP pairs per carrier (or cell). The terminal also activates one DL / UL BWP pair. A terminal operating according to FDD or using a paired spectrum is 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 activates one DL BWP and one UL BWP for each carrier (or cell). The terminal may not receive or transmit from time-frequency resources other than the activated BWP. An activated BWP is called an active BWP.

[0093] The base station refers to the activated BWP among the BWPs configured for the UE as a DCI. The BWP indicated in the DCI is activated, and the other configured BWP(s) are deactivated. In a carrier (or cell) operating in TDD, the base station includes a bandwidth part indicator (BPI) indicating the activated BWP in the DCI scheduling the PDSCH or PUSCH to change the DL / UL BWP pair of the UE. The UE receives the DCI scheduling the PDSCH or PUSCH and identifies the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI scheduling the PDSCH to change the DL BWP of the UE. In an uplink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI scheduling the PDSCH to change the UE's UL BWP.

[0094] FIG. 8 is a conceptual diagram illustrating carrier aggregation.

[0095] Carrier aggregation refers to a method in which a mobile station uses multiple frequency blocks or (logical) cells consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers) in one large logical frequency band so that the wireless communication system can use a wider frequency band. For convenience of explanation, the term "component carrier" will be used hereinafter.

[0096] Referring to Figure 8, in an example of a 3GPP NR system, the entire system band includes up to 16 component carriers, each of which has a bandwidth of up to 400 MHz. A component carrier includes one or more physically contiguous subcarriers. While Figure 8 shows each component carrier having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Furthermore, although each component carrier is shown adjacent to each other on the frequency axis, this is shown only as a logical concept, and each component carrier may be physically adjacent to each other or separated from each other.

[0097] A different center frequency is used for each component carrier. Also, a common center frequency is used for physically adjacent component carriers. In the embodiment of Fig. 8, if it is assumed that all component carriers are physically adjacent, center frequency A is used for all component carriers. Also, if it is assumed that the component carriers are not physically adjacent, center frequency A and center frequency B are used for each component carrier.

[0098] When the entire system band is expanded by carrier aggregation, the frequency band used for communication with each terminal is defined in component carrier units. Terminal A uses the entire system band of 100 MHz and communicates using all five component carriers. Terminals B1 to B5 only use a 20 MHz bandwidth and communicate using one component carrier. Terminals C1 and C2 only use a 40 MHz bandwidth and each communicate using two component carriers. The two component carriers may or may not be logically / physically adjacent. The example in Figure 8 shows a case where terminal C1 uses two non-adjacent component carriers and terminal C2 uses two adjacent component carriers.

[0099] 9A and 9B are diagrams for explaining single-carrier communication and multi-carrier communication, in particular, FIG. 9A shows a subframe structure of a single carrier, and FIG. 9B shows a subframe structure of a multi-carrier.

[0100] Referring to FIG. 9(a), in an FDD mode, a typical wireless communication system transmits or receives data through one DL band and one corresponding UL band. In another specific embodiment, in a TDD mode, the wireless communication system divides a radio frame into uplink time units and downlink time units in the time domain, and transmits or receives data through the uplink / downlink time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) are aggregated in each of the UL and DL to support a 60 MHz bandwidth. The CCs may be adjacent or non-adjacent to each other in the frequency domain. For convenience, FIG. 9(b) illustrates a case where the bandwidths of the UL CC and the DL CC are the same and symmetrical, but the bandwidths of each CC may be determined independently. Also, asymmetric carrier aggregation, in which the number of UL CCs and the number of DL CCs are different, is possible. The DL / UL CC allocated / configured to a specific terminal via RRC is referred to as the serving DL / UL CC of the specific terminal.

[0101] A base station communicates with a terminal by activating some or all of the serving CCs of the terminal or deactivating some of the CCs. The base station may change the activated / deactivated CCs or the number of activated / deactivated CCs. When a base station allocates CCs available to a terminal in a cell-specific or terminal-specific manner, at least one of the allocated CCs may not be deactivated unless the CC allocation for the terminal is completely reconfigured or the terminal performs a handover. A CC that is not deactivated by the terminal is called a primary CC (PCC) or PCell (primary cell), and a CC that the base station can activate / deactivate freely is called a secondary CC (SCC) or SCell (secondary cell).

[0102] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink and uplink resources, i.e., a combination of DL CC and UL CC. A cell may consist of only DL resources or a combination of DL and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CC) and the carrier frequency of UL resources (or UL CC) is indicated by system information. Carrier frequency 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. The carrier corresponding to a PCell in the downlink is a DL PCC, and the carrier corresponding to a PCell in the uplink is a UL PCC. Similarly, the carrier corresponding to an SCell in the downlink is a DL SCC, and the carrier corresponding to an SCell in the uplink is a UL SCC. Depending on the terminal capacity, a serving cell(s) may consist of one PCell and zero or more SCells. For a UE in RRC_CONNECTED state but not configured with carrier aggregation or not supporting carrier aggregation, there is only one serving cell consisting of only a PCell.

[0103] As described above, the term "cell" used in carrier aggregation is different from the term "cell" referring to a certain geographical area where communication services are provided by one base station or one antenna group. However, in order to distinguish between a cell referring to a certain geographical area and a cell of carrier aggregation, in the present invention, a cell of carrier aggregation is referred to as a CC, and a cell of a geographical area is referred to as a cell.

[0104] 10 is a diagram illustrating 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 schedules a data channel transmitted over a first or second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted from the PDCCH region of the scheduling cell schedules the PDSCH / PUSCH of a scheduled cell. That is, the PDCCH region of the scheduling cell is the search space for multiple component carriers. The PCell is basically the scheduling cell, and a specific SCell is designated as the scheduling cell by a higher layer.

[0105] In the embodiment of Figure 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). It is also assumed that the DL PCCs are configured as PDCCH monitoring CCs. If cross-carrier scheduling is not configured by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC transmits only a PDCCH that schedules its own PDSCH without a CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, if cross-carrier scheduling is configured by UE-specific (or UE-group-specific, or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., DL PCC) uses the CIF to transmit not only a PDCCH that schedules the PDSCH of DL CC A but also a PDCCH that schedules the PDSCH of another CC (cross-carrier scheduling). On the other hand, no PDCCH is transmitted on other DL CCs. Therefore, depending on whether cross-carrier scheduling is configured for the UE, the UE either monitors a PDCCH that does not include a CIF to receive a self-carrier scheduled PDSCH, or monitors a PDCCH that includes a CIF to receive a cross-carrier scheduled PDSCH.

[0106] 9 and 10 illustrate the subframe structure of a 3GPP LTE-A system, the same or similar structure can also be applied to a 3GPP NR system, except that in a 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

[0107] 11 is a block diagram illustrating the configuration of a terminal and a base station according to an embodiment of the present invention. In an embodiment of the present invention, the terminal may be implemented as any of various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal may be referred to as a UE, a station (STA), a mobile subscriber (MS), etc. In addition, in an embodiment of the present invention, the base station controls and manages cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area, and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may be referred to as a next generation NodeB (gNB) or an access point (AP), etc.

[0108] As shown, a terminal 100 according to one embodiment of the present invention includes a processor 110 , a communication module 120 , a memory 130 , a user interface unit 140 , and a display unit 150 .

[0109] First, the processor 110 executes various commands or programs to process data within the terminal 100. The processor 110 also controls the overall operation of the terminal 100, including each unit, and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 110 may receive slot configuration information, determine the slot configuration based on the information, and perform communication according to the determined slot configuration.

[0110] Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 120 includes 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 drawings, the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0111] The cellular communication interface card 121 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides cellular communication services in a first frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 121 includes at least one NIC module that utilizes a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 121 independently performs cellular communication with at least one of the base station 200, 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.

[0112] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server using a mobile communication network, and provides cellular communication services in the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 includes at least one NIC module that uses a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, the external device, and the server in accordance with the cellular communication standard or protocol for the frequency band above 6 GHz that the NIC module supports.

[0113] 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 via the 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 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 52.6 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 independently or dependently performs cellular communication with at least one of the base station 200, the external device, and the server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0114] The memory 130 stores control programs and various data used by the terminal 100. The control programs 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.

[0115] Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. Also, the user interface 140 performs output based on instructions from the processor 110 using various output means.

[0116] The display unit 150 then outputs various images to a display screen, and displays various display objects such as a user interface based on the content or control instructions of the processor 110.

[0117] The base station 200 according to the embodiment of the present invention also includes a processor 210 , a communication module 220 , and a memory 230 .

[0118] First, the processor 210 executes various instructions or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200, including each unit, and controls the transmission and reception of data between the units. Here, the processor 210 is configured to perform operations according to the embodiments described herein. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

[0119] Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 220 includes multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either built-in or externally mounted. Although the communication module 220 is shown as an integrated module in the drawings, the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0120] 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 provides cellular communication services in the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that uses a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0121] The cellular communication interface card 222 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides cellular communication services in the second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 includes at least one NIC module that uses a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol for the 6 GHz or higher frequency band supported by the NIC module.

[0122] 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 the 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 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 52.6 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 independently or dependently performs cellular communication with at least one of the terminal 100, the external device, and the server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0123] The terminal 100 and base station 200 shown in Figure 11 are block diagrams according to one embodiment of the present invention, and the separate blocks indicate logically distinct device elements. Therefore, the above-described device elements may be mounted on one chip or multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 150 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 additionally provided in the base station 200 as needed.

[0124] Uplink preemption indication

[0125] The base station may schedule a time-frequency resource scheduled for a physical uplink data channel transmission of one terminal for transmission of another physical uplink channel or a physical uplink channel of another wireless communication terminal. The base station may also schedule a time-frequency resource scheduled for a physical uplink channel transmission of one terminal for transmission of another type of physical uplink channel to be transmitted to the wireless communication terminal. This scheduling of a time-frequency resource scheduled for a specific purpose for another purpose is referred to as preemption. When a time-frequency resource scheduled for a physical uplink channel transmission of one terminal is preempted for transmission of a physical uplink channel of another wireless communication terminal, the base station may transmit an uplink (UL) preemption indicator to the terminal indicating the preempted time-frequency resource among the time-frequency resources scheduled for the terminal's uplink transmission. Here, the physical uplink channel may include a physical uplink data channel or a physical uplink control channel.

[0126] In this case, the uplink preemption indicator is a name given for convenience of explanation, and may be given another name such as a cancellation indication.

[0127] FIG. 12 illustrates an example of a method for receiving an indicator for revoking allocated resources for uplink transmission according to an embodiment of the present invention.

[0128] Referring to FIG. 12, the terminal can detect a PDDCH at a monitoring occasion in a monitoring periodicity, and can cancel resources scheduled for uplink transmission based on an uplink preemption indicator included in the detected PDCCH.

[0129] Specifically, as shown in Fig. 12, the terminal can detect the PDCCH at monitoring occasions A, B, C, and D for each monitoring period. In this case, the monitoring period may be configured by a higher layer (for example, RRC configuration information).

[0130] If the detected PDCCH DCI is a DCI of a specific format (e.g., DCI format 2_4) that includes an uplink preemption indicator for canceling resources scheduled for uplink transmission, the terminal can cancel some or all of the resources scheduled for uplink transmission based on the uplink preemption indicator included in the DCI.

[0131] In this case, the time-frequency resource region that can be cancelled by the uplink preemption indicator can be called a reference resource region, and the reference resource region may consist of 'Y' symbols on the time axis and at least one physical resource block (PRB) on the frequency axis.

[0132] The number of symbols 'Y' of the reference resource region may be previously configured by higher layer signaling (e.g., RRC configuration information) or may be determined based on the PDCCH monitoring period. In this case, the reference resource region may exclude some resource regions from the previously configured number of symbols or monitoring period.

[0133] Specifically, the resource region that can be canceled by the uplink preemption indicator is denoted by T CIsymbols and B on the frequency axis CI may consist of PRBs, T CI The symbols may be a predetermined number of symbols or symbols obtained by excluding a specific resource region from the monitoring period, where the specific resource region may include one or more symbols of a physical broadcast channel (PBCH) / synchronization signal (SS) and / or downlink symbols.

[0134] Reference resource region or T CI The symbols are 'X' symbols (T proc,2’ ) symbol, and the value of 'X' is the processing time (T proc,2 ) and offset value (d offset That is, the terminal may determine the index of the first symbol of the reference resource region based on the DCI processing time and offset value after the last symbol in which the PDCCH is detected.

[0135] B is the number of PRBs on the frequency axis of the reference resource region CI may be determined by a resource indication value (RIV) included in the RRC configuration information. The RIV may indicate the index of the starting PRB and the number of consecutive RBs in the reference resource region on the frequency axis, and the UE can recognize the number of PRBs in the reference resource region on the frequency axis based on the RIV value.

[0136] The uplink preemption indicator may indicate a resource region to be cancelled in a bitmap manner. That is, the reference resource region may be divided into a plurality of resource groups according to the number of bits of the uplink preemption indicator, and each resource group may be associated with each bit of the uplink preemption indicator. Whether each resource group is cancelled may be indicated by the value of the corresponding bit.

[0137] For example, as shown in FIG. 12, the number of bits of the uplink preemption indicator N CI When is '8', the reference resource area is divided into 8 groups b0 to b7 (4 groups on the time axis (G CI ), and two groups on the frequency axis), and each of the eight bits is assigned to b0 to b7, respectively, and can indicate whether or not uplink transmission is canceled.

[0138] The terminal can interpret and apply the numerology of the symbol indicated by the uplink preemption indicator as the numerology of the downlink cell in which the PDCCH of the uplink preemption indicator is detected.

[0139] That is, even if the symbol indicated by the uplink preemption indicator is a symbol for uplink transmission, the terminal can apply the numerology of the symbol as the numerology of the downlink cell in which the PDCCH is detected.

[0140] FIG. 13 is a flow chart illustrating an example of a method for revoking allocated resources for uplink transmission according to an embodiment of the present invention.

[0141] Referring to FIG. 13, the terminal may cancel resources for scheduled uplink transmission based on the DCI indicator transmitted via the PDCCH.

[0142] Specifically, the user equipment (UE) receives RRC configuration information including information for receiving downlink control information (DCI) from a base station (S13010).

[0143] For example, the RRC configuration information may include information related to a control resource set (CORESET) and a search space (e.g., a monitoring period for detecting a PDCCH) for the UE to detect a PDCCH including downlink control information. In this case, the information related to the control resource set may include at least one of an identifier (ID) of a control resource set in which the UE can detect a PDCCH including DCI, control channel element (CCE) configuration information, a duration of the control resource set, or frequency resource information. In this case, the information related to the search space may include at least one of an identifier (ID) of a search space in which the UE can detect a PDCCH including DCI, a format of DCI that can be detected in each search space, a detection duration, or resource information.

[0144] Furthermore, the RRC configuration information may further include an offset value for determining the start symbol of the reference resource region described in FIG.

[0145] Thereafter, the terminal can detect the PDCCH and receive the DCI at the monitoring opportunity within the monitoring period based on the RRC configuration information (S13020).

[0146] In this case, the DCI may include an uplink preemption indicator or a cancellation indicator, which is an indicator instructing the UE to cancel some or all of the resources scheduled for uplink transmission.

[0147] The DCI including the uplink preemption indicator may be in a specific format (e.g., DCI format 2_4) and may be transmitted via a group common PDCCH scrambled with a specific RNTI configured by a higher layer to indicate the DCI for resource revocation.

[0148] When the terminal receives DCI including an uplink preemption indicator, the terminal may cancel uplink transmission of a resource indicated by the uplink preemption indicator. In this case, the canceled resource may be a resource scheduled by another PDCCH before the PDCCH transmitting DCI of a specific format is detected.

[0149] As for the resources to be cancelled by the uplink preemption indicator, uplink transmission of the corresponding resources may be cancelled depending on the value of each bit, as described in FIG.

[0150] FIG. 14 shows a preemption indicator used in a wireless communication system according to an embodiment of the present invention.

[0151] The base station can configure the terminal to receive an uplink preemption indicator using an RRC signal. The base station can transmit the uplink preemption indicator to the terminal via a PDCCH. When the terminal is configured to receive an uplink preemption indicator using an RRC signal, the terminal can receive the uplink preemption indicator via a PDCCH. The terminal can acquire at least one of a search space for the uplink preemption indicator, an uplink preemption indicator monitoring period, an RNTI value, and an RNTI length using the RRC signal. The terminal can monitor the uplink preemption indicator according to the acquired uplink preemption indicator monitoring period. The terminal can also monitor the uplink preemption indicator in the search space for the acquired uplink preemption indicator. The terminal can also blind decode the scrambled DCI according to the acquired RNTI value and RNTI length. When the terminal finds the DCI scrambled with the acquired RNTI value, the terminal can determine that the DCI is an uplink preemption indicator. The base station can configure the same uplink preemption indicator configuration for multiple terminals using RRC signals. In this case, the PDCCH transmitting the uplink preemption indicator is a group-common PDCCH. The base station can configure the uplink preemption indicator for any one terminal using RRC signals. In this case, the PDCCH transmitting the uplink preemption indicator is a UE-specific PDCCH.

[0152] The time-frequency resource indicating whether the uplink preemption indicator is preempted or not can include all PRBs of the UL BWP. For convenience of explanation, the time-frequency resource indicating whether the uplink preemption indicator is preempted or not is called a reference resource region. The monitoring period of the uplink preemption indicator is defined as T INT Then, the reference resource region may be as shown in the following mathematical formula [Formula 7].

[0153]

number

[0154] At this time, Δ offset represents the offset of the time-frequency resource. Specifically, the offset of the time-frequency resource may be configured by an RRC signal. In yet another specific embodiment, the offset of the time-frequency resource may be a fixed value. Alternatively, the offset of the time-frequency resource may be a multiple of the number of symbols included in a slot. Alternatively, the offset of the time-frequency resource may be determined according to the PUSCH processing time of the terminal. Let Tproc be the minimum time it takes for the terminal to receive the physical downlink control channel that schedules the transmission of the physical uplink data channel and generate the physical uplink data channel. The offset of the time-frequency resource may be determined to be a larger number as Tproc increases. The offset of the time-frequency resource may be a value that increases in proportion to the value of Tproc. For example, the offset of the time-frequency resource may be determined as ceil(Tproc / Symbol_duration), where Symbol_duration is the duration of an OFDM symbol. Also, ceil(X) represents the smallest integer that is equal to or larger than X. In addition, the UE may determine the offset of the time-frequency resource based on a timing advance (TA). Specifically, the UE may determine the offset of the time-frequency resource according to the time difference between the DL frame boundary and the UL frame boundary according to the TA.

[0155] A base station may perform semi-static DL / UL assignment using a cell-specific RRC signal. In the semi-static DL / UL assignment, a symbol may be set to one of an uplink symbol, a downlink symbol, or a flexible symbol. In this case, an uplink symbol is a symbol capable of uplink transmission, and a downlink symbol is a symbol capable of downlink transmission. A flexible symbol is a symbol capable of uplink or downlink transmission according to a signal. The reference resource region may not include a downlink symbol set by the semi-static DL / UL assignment. That is, the reference resource region may include an uplink symbol set by the semi-static DL / UL assignment and a flexible symbol. In addition, the reference resource region may not include a flexible symbol located immediately after a downlink symbol. In this case, the number of flexible symbols located immediately after a downlink symbol not included in the reference resource region may be one. In yet another specific embodiment, the number of flexible symbols located immediately after the downlink symbols not included in the reference resource region may be configured by RRC signaling.

[0156] The base station may configure reception of a downlink signal using a cell-specific RRC signal. The downlink signal may include an SS / PBCH block. The reference resource region may not include a symbol configured for reception of the downlink signal. Furthermore, the reference resource region may not include a symbol located immediately after the symbol configured for reception of the downlink signal. In this case, the number of symbols located immediately after the symbol configured for reception of the downlink signal that are not included in the reference resource region may be one. In yet another specific embodiment, the number of symbols located immediately after the symbol configured for reception of the downlink signal that are not included in the reference resource region may be configured by the RRC signal.

[0157] The uplink preemption indicator may divide the reference resource region into N parts and indicate whether each of the N parts has been preempted, where N is a natural number. Specifically, the uplink preemption indicator may be a bitmap including N bits, where each of the N bits indicates whether each of the N parts of the reference resource region has been preempted, where N is a natural number. Specifically, the uplink preemption indicator may be a bitmap having a length of 14 bits. In this case, the UL preemption indicator may divide the reference resource region into 14 parts and indicate whether each of the 14 parts has been preempted. The 14 parts of the reference resource region may be divided into 14 parts on the time axis. In yet another specific embodiment, the 14 parts of the reference resource region may be divided into 7 parts on the time axis and 2 parts on the frequency axis. A method for determining the number of symbols included in a part of the reference resource region will be described.

[0158] The reference resource region can be divided into N parts such that the difference in the number of symbols included in each part of the reference resource region is at most 1. Specifically, when the reference resource region includes a total of S symbols, the mod(S,N) parts include ceil(S / N) symbols, and the N-mod(S,N) parts can include floor(S / N) symbols. mod(X,Y) represents the remainder when X is divided by Y. ceil(X) represents the smallest integer greater than or equal to X. floor(X) represents the largest integer less than or equal to X. This can be expressed as mod(S,N) = S - floor(S / N) * N. In this case, the mod(S,N) parts located earlier in time can include ceil(S / N) symbols. In the above-described embodiment, S and N are both natural numbers.

[0159] The UE may not transmit the physical uplink channel at a symbol for which the uplink preemption indicator indicates preemption, but may transmit the physical uplink channel at a symbol for which the uplink preemption indicator indicates no preemption. In yet another specific embodiment, the UE may sequentially transmit the physical uplink channel at symbols for which the physical uplink data channel can be transmitted and discard the remaining physical uplink channels. In the embodiment of FIG. 12, the base station schedules the UE to transmit the physical uplink data channel at 14 symbols. In this case, the uplink preemption indicator indicates that the 5th and 9th symbols are to be preempted. The UE may not transmit REs for the physical uplink data channel corresponding to the 5th and 9th symbols, as shown in FIG. 12(a). In this case, the UE may further transmit REs for the physical uplink data channel corresponding to the 5th and 9th symbols in the allocated time-frequency resources. Also, the UE may sequentially transmit REs of the physical uplink data channel corresponding to 12 symbols as shown in (b) of Figure 12. In this case, the UE may further transmit REs of the physical uplink data channel corresponding to the 13th and 14th symbols in the allocated time-frequency resources.

[0160] The UE can transmit the physical uplink channel that could not be transmitted due to preemption using a time-frequency resource other than the preempted time-frequency resource. In this case, the other time-frequency resource may be a resource different from the resource for the already scheduled physical uplink channel transmission. For convenience of explanation, the other time-frequency resource is referred to as an additional time-frequency resource. The additional time-frequency resource may be a time-frequency resource for uplink transmission that is located later in time than the resource for the already scheduled physical uplink channel transmission. The physical uplink channel scheduled in the preempted time-frequency resource and the additional time-frequency resource may have the same frequency resource. The additional time-frequency resource may be the closest symbol designated as an uplink symbol by semi-static DL / UL allocation after the time-frequency resource in which the physical uplink data channel scheduled in the preempted time-frequency resource is scheduled. In yet another specific embodiment, the additional time-frequency resource may be an uplink symbol or a flexible symbol allocated by semi-static allocation after the time-frequency resource in which the physical uplink channel scheduled in the preempted time-frequency resource is scheduled. Alternatively, the additional time-frequency resource may be a symbol located N symbols after the physical uplink channel scheduled in the preempted time-frequency resource, where N is a natural number and may be configured by an RRC signal. In yet another specific embodiment, N may be a fixed number.

[0161] In a specific embodiment, the uplink preemption indicator may include information about the starting symbol of the additional time-frequency resource. The UE may transmit the physical uplink channel that could not be transmitted due to preemption from the starting symbol of the additional resource indicated by the uplink preemption indicator. In the embodiment of FIG. 12, the UL preemption indicator indicates A as the starting symbol of the additional time-frequency resource. The UE may transmit PUSCH REs corresponding to the 5th and 9th symbols that could not be transmitted due to preemption from the symbol A after the symbol at which the PUSCH scheduled on the preempted time-frequency resource is scheduled, as shown in FIG. 14(a). In FIG. 14(a), B is the length of the PUSCH RE corresponding to the 5th symbol. Furthermore, the UE may transmit PUSCH REs corresponding to the 13th and 14th symbols from the symbol A after the symbol at which the PUSCH scheduled on the preempted time-frequency resource is scheduled, as shown in FIG. 14(b). In FIG. 14(b), B is the length of the RE of the PUSCH corresponding to the 13th symbol.

[0162] The uplink preemption indicator may indicate whether or not a physical uplink channel that has not been transmitted due to preemption needs to be transmitted. The terminal may determine whether or not to transmit a physical uplink channel that has not been transmitted due to preemption based on the uplink preemption indicator. Specifically, the uplink preemption indicator may use a 1-bit field to indicate whether or not a physical uplink channel that has not been transmitted due to preemption needs to be transmitted. For example, if the value of the 1-bit field is 1, the terminal may transmit the physical uplink channel that has not been transmitted due to preemption using additional time-frequency resources. If the value of the 1-bit field is 0, the terminal may not transmit the physical uplink channel that has not been transmitted due to preemption.

[0163] FIG. 15 shows a range of physical uplink channels in which a wireless communication terminal according to an embodiment of the present invention cannot transmit due to preemption.

[0164] When the time-frequency region indicated by the uplink preemption indicator to be preempted overlaps even partially with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled, the terminal does not need to transmit the entire physical uplink channel. In (a) of Figure 15, the time-frequency region indicated by the uplink preemption indicator to be preempted partially overlaps with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled. In this case, the terminal does not transmit the entire physical uplink channel.

[0165] When the time-frequency region indicated by the uplink preemption indicator to be preempted overlaps even partially with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled, the terminal does not need to transmit the physical uplink channel only in the symbols overlapping with the time-frequency region indicated by the uplink preemption indicator to be preempted. In (b) of Figure 15, the time-frequency region indicated by the uplink preemption indicator to be preempted partially overlaps with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled. In this case, the terminal does not transmit the physical uplink channel in the symbols overlapping with the time-frequency region indicated by the uplink preemption indicator to be preempted.

[0166] When the time-frequency region indicated by the uplink preemption indicator to be preempted overlaps even partially with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled, the terminal does not need to transmit the physical uplink channel in the time-frequency resource in which the transmission of the physical uplink channel is scheduled, starting from a symbol corresponding to the time-frequency region indicated by the uplink preemption indicator to be preempted. In (c) of FIG. 15, the time-frequency region indicated by the uplink preemption indicator to be preempted partially overlaps with the time-frequency resource in which the transmission of the physical uplink channel of the terminal is scheduled. In this case, the terminal does not transmit the physical uplink channel from the symbol in the time-frequency region indicated by the uplink preemption indicator to be preempted.

[0167] The physical uplink channel may include a DMRS for channel estimation. If the DMRS cannot be transmitted due to preemption, the base station may not be able to receive the physical uplink channel transmitted by the terminal. The terminal needs to transmit the physical uplink channel that could not be transmitted due to preemption, taking into account whether or not the DMRS is transmitted. This will be described with reference to FIG. 16.

[0168] FIG. 16 illustrates an operation of a terminal according to an embodiment of the present invention transmitting a physical uplink channel that could not be transmitted due to preemption.

[0169] As described above, the uplink preemption indicator may include information about additional time-frequency resources. The terminal may transmit physical uplink channels on the additional time-frequency resources based on the information about the additional time-frequency resources. At this time, the terminal may transmit physical uplink channels that could not be transmitted due to preemption. In yet another specific embodiment, the terminal may transmit the entire physical uplink channels that could not be transmitted due to preemption.

[0170] In this case, the information about the additional time-frequency resource may be expressed in terms of the number of symbols or the number of slots. Specifically, the information about the additional time-frequency resource may indicate whether the additional time-frequency resource is located several symbols after the last symbol of the preempted time-frequency resource or the last symbol of the reference resource region. Alternatively, the information about the additional time-frequency resource may indicate whether the additional time-frequency resource is located several slots after the last symbol of the preempted time-frequency resource or the last symbol of the reference resource region. The symbol where the additional time-frequency resource is located may be the first symbol after the preempted time-frequency resource among symbols designated as uplink symbols by semi-static DL / UL allocation. Alternatively, the symbol where the additional time-frequency resource is located may be a symbol indicated by DCI scheduling transmission of the physical uplink channel.

[0171] The UE can determine the type of physical uplink channel to be transmitted in the additional time-frequency resources depending on whether the DMRS of the physical uplink channel cannot be transmitted due to preemption. Specifically, if the UE cannot transmit the DMRS due to preemption, the UE can retransmit the entire physical uplink channel, any part of which could not be transmitted due to preemption, in the additional time-frequency resources. Also, if the UE transmits the DMRS despite the occurrence of preemption, the UE can transmit the part of the physical uplink channel, which could not be transmitted due to preemption, in the additional time-frequency resources. If the physical uplink channel, which could not be transmitted due to preemption, does not include the DMRS, the UE can transmit the DMRS together with the part of the physical uplink channel, which could not be transmitted due to preemption, in the additional time-frequency resources.

[0172] In the embodiment of FIG. 16, the UE determines the time-frequency resource where preemption occurred based on the uplink preemption indicator. The UE cannot transmit the physical uplink channel due to preemption. In FIG. 16(a), the UE cannot transmit the DMRS of the physical uplink channel due to preemption. Therefore, the UE transmits the entire physical uplink channel in the additional time-frequency resource indicated by the uplink preemption indicator. In FIG. 16(b), the UE cannot transmit part of the physical uplink channel due to preemption, but transmits the DMRS of the physical uplink channel. Therefore, the UE can transmit part of the physical uplink channel that was not transmitted due to preemption in the additional time-frequency resource. In this case, the UE transmits both the part of the physical uplink channel and the DMRS.

[0173] FIG. 17 shows a range of physical uplink channels in which a wireless communication terminal according to yet another embodiment of the present invention cannot transmit due to preemption.

[0174] The physical uplink data channel may include a DMRS for channel estimation. The physical uplink data channel may also include uplink control information (UCI). In this case, the UCI may be transmitted in REs surrounding the DMRS symbol. If preemption does not affect the transmission of the DMRS and UCI, the UE may transmit the physical uplink data channel in the symbols in which the DMRS and UCI are transmitted. In this case, the UE may not transmit the physical uplink data channel in the time-frequency in which the uplink preemption indicator indicates that the physical uplink data channel is preempted, as shown in (a) of FIG. 17. In yet another specific embodiment, the UE may not transmit the physical uplink data channel in symbols other than the symbols in which the DMRS and UCI are transmitted, as shown in (b) of FIG. 17. If preemption affects the transmission of the DMRS and UCI, the UE may not transmit the entire physical uplink data channel, as shown in (c) of FIG. 17. A case in which preemption affects DMRS and UCI transmission may be when the time-frequency region in which the uplink preemption indicator indicates that preemption has occurred overlaps with the physical uplink channel on which the DMRS transmission or UCI transmission is scheduled.

[0175] FIG. 18 illustrates an operation of a terminal according to an embodiment of the present invention for transmitting DMRS and UCI that could not be transmitted due to preemption.

[0176] The UE may determine the type of the physical uplink data channel to be transmitted on the additional time-frequency resource according to information included in the physical uplink data channel. Specifically, the UE may determine the type of the physical uplink data channel to be transmitted on the additional time-frequency resource according to whether preemption affects the transmission of uplink control information (UCI) included in the physical uplink data channel. Preemption may affect the transmission of UCI included in the physical uplink data channel when at least some of the REs scheduled for UCI transmission cannot be transmitted due to preemption. If preemption does not affect the UCI transmission included in the physical uplink data channel, the UE may not transmit only the physical uplink data channel scheduled on the time-frequency resource indicated by the uplink preemption indicator. In this case, the UE may not transmit the physical uplink data channel that could not be transmitted due to preemption on the additional time-frequency resource. If preemption affects the transmission of UCI included in the physical uplink data channel, the terminal may not transmit the entire physical uplink data channel or the physical uplink data channel indicated by the uplink preemption indicator. In this case, the terminal may transmit the entire physical uplink data channel or the physical uplink data channel indicated by the uplink preemption indicator in additional time-frequency resources. In this case, the terminal may transmit the physical uplink data channel including only UCI in the additional time-frequency resources. Specifically, the terminal may transmit the physical uplink data channel except for symbols to which only the uplink shared channel (UL-SCH) is mapped in the physical uplink data channel. In yet another specific embodiment, the terminal may transmit the physical uplink data channel except for REs to which the uplink shared channel (UL-SCH) is mapped in the physical uplink data channel.In yet another specific embodiment, the UE may transmit a physical uplink data channel including both the UL-SCH and UCI on the additional time-frequency resource. In such an embodiment, the UCI may be limited to HARQ-ACK information. Alternatively, the UCI may include HARQ-ACK information and CSI. In the embodiment of FIG. 18, the uplink preemption indicator indicates that the REs scheduled for DMRS and UCI transmission are preempted. Therefore, the UE does not transmit the entire physical uplink data channel or the physical uplink data channel indicated by the uplink preemption indicator. The UE transmits a physical uplink data channel including only the DMRS and UCI on the additional time-frequency resource indicated by the uplink preemption indicator.

[0177] Specifically, the UE may determine the type of physical uplink data channel to transmit on the additional time-frequency resource depending on whether the preemption affects the transmission of at least one of UCI and DMRS included in the physical uplink data channel. If the preemption affects the transmission of UCI or DMRS included in the physical uplink data channel, it may be the case that at least some of the REs scheduled for UCI transmission and the REs scheduled for DMRS transmission cannot be transmitted due to preemption. If the preemption does not affect the transmission of UCI or DMRS included in the physical uplink data channel, the UE may not transmit the physical uplink data channel scheduled on the time-frequency resource indicated by the uplink preemption indicator. In this case, the UE may not transmit the physical uplink data channel that could not be transmitted due to preemption on the additional time-frequency resource. If the preemption affects the transmission of UCI or DMRS included in the physical uplink data channel, the UE may not transmit the entire physical uplink data channel. In this case, the terminal can transmit the entire physical uplink data channel on the additional time-frequency resource. In this case, the terminal can transmit a physical uplink data channel including only UCI on the additional time-frequency resource. In yet another specific embodiment, the terminal can transmit a physical uplink data channel including both UL-SCH and UCI on the additional time-frequency resource. In this embodiment, the UCI may be limited to HARQ-ACK information, or may include HARQ-ACK information and CSI.

[0178] When a terminal whose physical uplink channel has been preempted based on the UL preemption indication transmits the preempted physical uplink channel on an additional time-frequency resource, the terminal may receive another uplink preemption indicator. In this way, if preemption occurs on an additional time-frequency resource, the terminal does not need to transmit the physical uplink channel on the additional time-frequency resource. In this case, the terminal can transmit the physical uplink channel that could not be transmitted due to preemption on the new additional time-frequency resource based on the uplink preemption indicator that indicates preemption on the additional time-frequency resource. Specifically, if the uplink preemption indicator that indicates preemption on the additional time-frequency resource indicates a new additional time-frequency resource, the terminal can transmit the physical uplink channel that could not be transmitted due to preemption on the new additional time-frequency resource. In yet another specific embodiment, even if an uplink preemption indicator that indicates preemption on an additional time-frequency resource indicates a new additional time-frequency resource, the terminal may not transmit the physical uplink channel that could not be transmitted due to the preemption on the new additional time-frequency resource.

[0179] When the physical uplink control channel is preempted, the terminal can determine whether to transmit the physical uplink control channel on the additional time-frequency resource according to information included in the physical uplink control channel. Specifically, when the physical uplink control channel includes HARQ-ACK and preemption affects the physical uplink control channel transmission, the terminal does not need to transmit the physical uplink control channel on the time-frequency resource scheduled for the transmission. In this case, the terminal can transmit the physical uplink control channel that could not be transmitted due to the preemption on the additional time-frequency resource.

[0180] The following describes resource regions in which resources scheduled for uplink transmission may be cancelled by an uplink preemption indicator.

[0181] Reference resource region for UL preemption indication

[0182] In the present invention, a resource region in which uplink transmission is canceled by an uplink preemption indicator is called a reference resource region, but this is for convenience of explanation and is not intended to be limiting.

[0183] The UE may detect a PDCCH of a DCI including an uplink preemption indicator, which indicates the cancellation of resources already scheduled for uplink transmission, using blind detection in a search space of CORESET. In this case, the PDCCH of the DCI including the uplink preemption indicator may be a group common PDCCH scrambled with a specific RNTI (e.g., UL-INT-RNTI).

[0184] For example, the terminal may be scheduled with resources for uplink transmission by the base station using DCI in a PDCCH, and the base station may then transmit a PDCCH of DCI including an uplink preemption indicator to cancel the scheduled resources for uplink transmission to the terminal, and the PDCCH of DCI including the uplink preemption indicator may be scrambled with the UL-INT-RNTI set by a higher layer to indicate the DCI for cancellation of the scheduled resources.

[0185] When the UE successfully receives an uplink preemption indicator (i.e., when a group-common DCI scrambled with a specific RNTI is detected), the UE can identify a reference resource region indicated by the uplink preemption indicator. Then, the UE can identify time-frequency resources in the reference resource region where uplink transmission is to be canceled based on the information indicated by the uplink preemption indicator, and can cancel uplink transmission in the identified time-frequency resources. In the present invention, the frequency region of the reference resource region can include all physical resource blocks (PRBs) of an active bandwidth part (BWP).

[0186] 19 to 24 show examples of reference resource regions that can be indicated by an uplink preemption indicator according to an embodiment of the present invention.

[0187] FIG. 19, which is a first embodiment of the present invention, illustrates an example of resources indicated by preemption according to an embodiment of the present invention.

[0188] Referring to FIG. 19, the reference resource region that can be indicated by the uplink preemption indicator may be indicated by the interval between symbols at which the uplink preemption indicator is received, or may be indicated from a symbol a specific symbol after the last symbol at which the uplink preemption indicator is received.

[0189] Specifically, as shown in FIG. 19, when a downlink cell has a monitoring opportunity for detecting a PDCCH of a DCI including nine uplink preemption indicators, the reference resource regions that can be indicated by each of the nine preemption indicators included in the DCI that can be detected at each monitoring opportunity may be determined so that there are no overlapping resource regions.

[0190] That is, the reference resource region to which the uplink preemption indicator can be applied may be a resource region indicated by a higher layer or a region in which a specific symbol is excluded from a period for monitoring the PDCCH.

[0191] In this case, since the reference resource regions indicated by each uplink preemption indicator are determined so as not to overlap, the reference resource regions can be indicated most precisely using the same bit. However, in the embodiment described in FIG. 19, if the UE is unable to receive any one of the multiple uplink preemption indicators because the UE is not detected (reception failure), the uplink transmission in the resource region indicated by the unsuccessfully received uplink preemption indicator cannot be canceled. Also, when a pause without resume scheme is applied in which the remaining symbols are canceled when even one symbol of the uplink channel is canceled, if the UE is unable to receive any one of the multiple uplink preemption indicators, the uplink transmission in the reference resource indicated by the unsuccessfully received uplink preemption indicator and subsequent uplink transmissions cannot be canceled.

[0192] In other words, in this embodiment, the number of symbols in the reference resource region that can be canceled by the uplink preemption indicator is T CI may be symbols excluding symbols for receiving SS / PBCH blocks and / or symbols designated as downlink symbols by RRC configuration information from a plurality of symbols.

[0193] In this case, the number of symbols may be indicated by a higher layer (e.g., MIB or SIB) if the monitoring period of the PDCCH for a search space set for a DCI of a specific format is one slot and one or more monitoring occasions for monitoring the PDCCH exist in one slot. Otherwise, the number of symbols may be the same as the monitoring period for monitoring the PDCCH.

[0194] If the number of symbols is set by a higher layer, the number of symbols may be set to any one of 2, 4, 7, or 14.

[0195] FIG. 20, which is a second embodiment of the present invention, illustrates yet another example of resources indicated by preemption according to an embodiment of the present invention.

[0196] Referring to FIG. 20, a reference resource region that may be indicated by an uplink preemption indicator may be determined as a number of symbols from a specific symbol after the last symbol in which the uplink preemption indicator is received.

[0197] Specifically, as shown in Figure 20, a reference resource region that can be indicated by an uplink preemption indicator may be determined as 'Y' symbols after 'X' symbols from the symbol following the last symbol at which the PDCCH of the DCI including the uplink preemption indicator is received, where the value of 'X' will be described later.

[0198] In this case, 'Y' may be a preset value. For example, the value of 'Y' may preferably be the number of symbols included in one slot (i.e., 14 for a normal CP and 12 for an extended CP). Alternatively, the value of 'Y' may be determined to be the larger of a preset value or a monitoring period for monitoring the PDCCH.

[0199] For example, if the preset value is 14 and the period for monitoring the PDCCH is 2 symbols, the number of symbols constituting the reference resource region that can be indicated by the uplink preemption indicator may be determined to be 14. Alternatively, if the preset value is 14 and the period for monitoring the PDCCH is 28 symbols (2 slots), the number of symbols constituting the reference resource region that can be indicated by the uplink preemption indicator may be determined to be 28.

[0200] 20 illustrates a case where a downlink cell has nine monitoring occasions for monitoring a PDCCH of a DCI including an uplink preemption indicator. In FIG. 20, reference resource regions that may be indicated by the uplink preemption indicator in each of the plurality of monitoring occasions may be determined such that each reference resource region partially or entirely overlaps with the previous and / or subsequent reference resource regions. Therefore, even when a terminal receives one uplink preemption indicator, the terminal can obtain information for canceling uplink transmission over a wide time domain.

[0201] In addition, even if the terminal fails to receive some of the multiple uplink preemption indicators, the terminal can obtain information for canceling uplink transmission based on the uplink preemption indicators received in other monitoring occasions.

[0202] For example, as shown in Figure 40, there are nine monitoring opportunities for receiving PDCCHs of DCIs including uplink preemption indicators for canceling resources scheduled for uplink transmission, and the reference resource regions indicated by the uplink preemption indicators may overlap with each other, i.e., the reference resource region indicated by the second uplink preemption indicator overlaps with the resource regions indicated by the first, third, and fourth uplink preemption indicators, and the reference resource region indicated by the third uplink preemption indicator overlaps with the resource regions indicated by the second and fourth uplink preemption indicators.

[0203] In this case, even if the terminal fails to detect the PDCCH of the DCI including the second uplink preemption indicator, if the terminal successfully detects the PDCCH of the DCI including the first, third, and fourth uplink preemption indicators, the terminal can cancel the uplink transmission for the reference resource region indicated by the second uplink preemption indicator even if it does not receive the second uplink preemption.

[0204] FIG. 21, which is a third embodiment of the present invention, illustrates yet another example of resources indicated by preemption according to an embodiment of the present invention.

[0205] 21, a reference resource region indicated by an uplink preemption indicator may be determined as a number of symbols from a specific symbol after the last symbol at which the uplink preemption indicator is received, where the number of symbols may be limited to symbols included in a slot including the first symbol of the reference resource region indicated by the uplink preemption indicator.

[0206] That is, unlike Figures 19 and 20, in the third embodiment of Figure 21, symbols in the reference resource region that can be indicated by the uplink preemption indicator are not determined across slot boundaries. In other words, the uplink channel of a terminal that monitors the PDCCH of a DCI that includes an uplink preemption indicator is scheduled within one slot. Therefore, information for canceling uplink transmission in the next slot is not required, and therefore the number of symbols that can be indicated by the uplink preemption indicator may be limited to within one slot. In this case, the number of symbols included in the reference resource region may be reduced, and therefore the region in which uplink transmission is canceled can be indicated more precisely.

[0207] FIG. 22, which is a fourth embodiment of the present invention, illustrates yet another example of resources indicated by preemption according to an embodiment of the present invention.

[0208] 22, a reference resource region that can be indicated by an uplink preemption indicator may be determined as a number of symbols starting from a specific symbol after the last symbol at which the uplink preemption indicator is received. While the start symbols of the reference resource regions indicated by the uplink preemption indicators are all different in FIGS. 19 to 21, the start symbols of the reference resource regions indicated by the uplink preemption indicators in FIG. 22 are the same as the first symbol of each slot.

[0209] The uplink channel of a terminal that monitors the uplink preemption indicator is scheduled within one slot, and if the uplink transmission of a previous symbol in a slot is canceled, the symbols located later may also be canceled (pause without resume). Therefore, it is important to indicate whether the symbols located earlier in the slot are canceled or not.

[0210] As shown in FIG. 22, in the fourth embodiment, even if a terminal receives one uplink preemption indicator out of four uplink preemption indicators that instruct the cancellation of uplink transmission of a symbol in the same slot, the terminal can still obtain information about preemption within the slot.

[0211] FIG. 23, which is a fifth embodiment of the present invention, illustrates yet another example of resources indicated by preemption according to an embodiment of the present invention.

[0212] Referring to FIG. 23, the reference resource region that may be indicated by the uplink preemption indicator may include symbols from 'X' symbols after the last symbol of the monitoring opportunity after the uplink preemption indicator is received to 'Y' symbols before the last symbol.

[0213] For example, as shown in FIG. 23, the reference resource region indicated by the uplink preemption indicator received in the first monitoring occasion may be determined to be 'Y' symbols before the symbol 'X' or later from the last symbol of the second monitoring occasion.

[0214] In this case, the value of 'Y' may be the same as a pre-set value or the monitoring period of the PDCCH. For example, the value of 'Y' may preferably be the number of symbols included in one slot (i.e., 14 for a normal CP and 12 for an extended CP). Alternatively, the value of 'Y' may be determined to be the maximum value of the pre-set value or the monitoring period. That is, if the pre-set value is 14 and the monitoring period is 2 symbols, the value of 'Y' may be determined to be 14. Alternatively, if the pre-set value is 14 and the monitoring period is 28 symbols (2 slots), the value of 'Y' may be determined to be 28.

[0215] Alternatively, the value of 'Y' may be determined as the sum of Y1 and Y2, where Y1 is a preset value and Y2 is a PDCCH monitoring period. This is an embodiment in which Y1 or Y2 previous symbols are added to the reference resource region described in FIG. 19. In this case, similar to the fourth embodiment of FIG. 22, the terminal can receive information related to the cancellation of previous uplink transmissions.

[0216] FIG. 24, which is a sixth embodiment of the present invention, illustrates yet another example of resources indicated by preemption according to an embodiment of the present invention.

[0217] 24, the reference resource region that can be indicated by the uplink preemption indicator, similar to the fifth embodiment, is from a specific symbol 'X' symbols after the last symbol of the monitoring occasion following the monitoring occasion in which the uplink preamble indicator is received to the first symbol of the slot including the specific symbol. In this case, similar to the fourth and fifth embodiments described with reference to FIGS. 22 and 23, information for canceling a previously transmitted uplink transmission can be obtained by receiving the uplink preemption indicator. In addition, this embodiment can reduce the number of symbols included in the reference resource region compared to the fifth embodiment described with reference to FIG.

[0218] The value of 'X' described in the first embodiment of FIG. 19 to the sixth embodiment of FIG. 24 may be determined as the minimum number of symbols required to cancel uplink transmission. That is, because a UE requires processing time to decode a PDCCH detected at a monitoring occasion of a monitoring period, the UE can cancel uplink transmission for a symbol located a certain number of symbols after receiving an uplink preemption indicator. Therefore, the UE can cancel uplink transmission at the scheduled symbol only if it receives an uplink preemption indicator at a symbol a certain number of symbols before the symbol at which cancellation of uplink transmission is scheduled. Therefore, the value of 'X' may correspond to the minimum number of symbols taking processing time into consideration.

[0219] When uplink transmission is scheduled by the PDCCH transmitted from the base station, the terminal can determine monitoring occasions to monitor based on the reference resource region set by a higher layer. That is, if the resource scheduled for uplink transmission and the reference resource region overlap by even one symbol, the terminal must detect the PDCCH in the monitoring occasion associated with the reference resource region and blindly decode the uplink preemption indicator included in the DCI. That is, when the reference resource region indicated by the higher layer overlaps with the resource region scheduled for uplink transmission, the terminal must determine the resource region in which uplink transmission is to be canceled, and therefore, must detect the PDCCH in the monitoring occasion that can indicate the resource region to be canceled in the reference resource region.

[0220] Conversely, if the resources scheduled for uplink transmission do not overlap with the reference resource region configured by higher layers, there is no need to blindly decode the uplink preemption indicator to cancel the uplink transmission in that reference resource region.

[0221] In this case, an uplink preemption indicator according to a specific format of DCI is applied, and the uplink transmission that may be canceled may be a PUSCH transmission, an SCS transmission, a PRACH transmission, or the like.

[0222] 'X' and 'Y' values ​​for determining the position of the reference resource region on the time axis may be configured by the base station for the terminal. Here, the 'X' value is a value for determining the start symbol of the reference resource region, and the 'Y' value is a value for determining the number of symbols constituting the reference resource region. That is, when the terminal detects and receives a PDCCH of DCI including an uplink preemption indicator, the reference resource region may be configured as 'Y' consecutive symbols, starting from the last symbol of the PDCCH and X symbols later, based on the 'X' and 'Y' values ​​configured by a higher layer. In this case, to apply the 'X' and 'Y' values ​​configured by the downlink RRC configuration information to symbols for uplink transmission, the subcarrier spacing and CP type of the symbols to which the 'X' and 'Y' values ​​are applied need to be determined.

[0223] That is, since the subcarrier spacing and CP type for symbols on the time axis may differ between the downlink and uplink and / or between each cell and BWP for the uplink, when a specific number of symbols set in the downlink are applied to the uplink, the subcarrier spacing and CP type for the specific number of symbols must be determined.

[0224] Below, we will explain a method for determining numerology (e.g., subcarrier spacing and cyclic prefix (CP) type) for defining 'X' and 'Y' symbols for determining a reference resource region.

[0225] As a first embodiment, the subcarrier spacing and CP type, which are numerologies for 'X' and 'Y' symbols, may be configured in a terminal by a base station along with the values ​​of 'X' and 'Y'. That is, in addition to the 'X' and 'Y' values, the subcarrier spacing and CP type applied to the 'X' and 'Y' symbols may also be configured in the terminal by RRC configuration information (RRC signaling) from a higher layer. That is, the base station can transmit the subcarrier spacing and CP type applied to the 'X' and 'Y' symbols in addition to 'X' and 'Y' in the RRC configuration information to the terminal.

[0226] The UE can determine 'X' symbols and 'Y' symbols based on the subcarrier spacing and CP type set by the RRC configuration information. In this case, the subcarrier spacing and CP type may be set for each cell. In this case, if each uplink bandwidth part (UL BWP) has a different subcarrier spacing and CP type, the UE must interpret the subcarrier spacing and CP type for the 'X' symbols and 'Y' symbols accordingly. Alternatively, the subcarrier spacing and CP type may be set for each UL BWP.

[0227] In a second embodiment, when 'X' symbols and 'Y' symbols are configured by the RRC configuration information of the higher layer, the terminal can interpret the subcarrier spacing and CP type for the 'X' symbols and 'Y' symbols as the subcarrier spacing and CP type of the downlink BWP (DL BWP) of the cell in which the PDCCH of the DCI including the uplink preemption indicator is detected.

[0228] That is, the UE may interpret the 'X' and 'Y' symbols for indicating the reference resource region where uplink transmission is canceled by the uplink preemption indicator by applying the subcarrier spacing and CP type of the DL BWP in which the uplink preemption indicator is received.

[0229] For example, if the subcarrier spacing of the DL BWP in which the uplink preemption indicator is received is 15 kHz and the CP type is normal CP, and the subcarrier spacing of the symbols for uplink transmission canceled by the uplink preemption indicator is 30 kHz and the CP type is extended CP, the subcarrier spacing for 'X' and 'Y' can be interpreted as 15 kHz and the CP type as normal CP and applied to the reference resource region.

[0230] In other words, the terminal can determine the symbol interval (subcarrier interval) for the uplink transmission to be canceled as the symbol interval of an activated downlink BWP for monitoring the PDCCH for a particular format including an uplink preemption indicator.

[0231] In a third embodiment, the subcarrier spacing and CP type for 'X' and 'Y' symbols may be determined based on the subcarrier spacing and CP type of a UL BWP paired with a DL BWP of a cell to which an uplink preemption indicator is transmitted, where the DL BWP and the UL BWP may have the same BWP ID.

[0232] As a fourth embodiment, the subcarrier spacing and CP type for 'X' and 'Y' symbols may be determined based on the subcarrier spacing and CP type of the uplink cell having the lowest cell ID.

[0233] As a fifth embodiment, the subcarrier spacing and CP type for 'X' and 'Y' symbols may be determined based on the minimum or maximum subcarrier spacing among the subcarrier spacings of the uplink cell and the corresponding CP type.

[0234] Using this method, the subcarrier spacing and CP type for the 'X' and 'Y' values ​​set by the higher layer signal can be determined.

[0235] The reference resource region is a set of uplink resources from which the uplink preemption indicator can be cancelled. Here, the uplink resource may include at least one PRB on the frequency axis and at least one symbol on the time axis. When the subcarrier spacing of the PDCCH transmitting the uplink preemption indicator is different from the subcarrier spacing of the PUSCH or SRS transmission, which is an uplink transmission, the symbols included in the reference resource region may be determined in the following manner.

[0236] First, the terminal may be configured with a reception period and offset of a PDCCH that transmits an uplink preemption indicator from the base station. The reception period and offset may be configured in slot units. That is, the terminal may be configured to receive an uplink preemption indicator every several slots. Furthermore, the base station may instruct the terminal which symbols to receive the PDCCH that transmits the uplink preemption indicator within a slot. For example, the base station may use a bitmap consisting of 14 bits to instruct the terminal which symbols to receive the PDCCH that transmits the UL CI. Each bit of the bitmap corresponds to 14 symbols. If a bit value of the bitmap is 1, the PDCCH that transmits the uplink preemption indicator may be received at the corresponding symbol.

[0237] The symbols included in the uplink reference resource corresponding to one uplink preemption indicator may be determined as follows.

[0238] 'X' symbols (or T symbols) from the end of the PDCCH that transmits the uplink preemption indicator proc,2 ) may be determined as a reference resource region corresponding to the uplink preemption indicator. proc,2is a value corresponding to the minimum time for PUSCH transmission. If the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is different from the subcarrier spacing of the PUSCH or SRS transmission, the number of symbols 'Y' included in the reference resource region may be determined by the following method.

[0239] FIG. 25, which is a first embodiment of the present invention, illustrates an example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention.

[0240] Specifically, when the subcarrier spacing of the downlink BWP in which the PDCCH is received is smaller than the subcarrier spacing for uplink transmission, 'Y' may be determined by the following mathematical formula (hereinafter, the subcarrier spacing of the downlink BWP in which the PDCCH is received is μ DL , the subcarrier spacing for uplink transmission is μ UL Let's assume that.)

[0241] Y=2^(μ DL -μ UL )*S CI

[0242] In the above mathematical formula, S CI is a value set by the base station to the terminal, and may have at least one of the values ​​2, 4, 7, and 14. CI may be determined as the number of uplink symbols included in the period for monitoring the PDCCH in which the uplink preemption indicator is transmitted. CI =P CI *N symb where P CI is the slot-unit reception period of the PDCCH that transmits the uplink preemption indicator. symbis the number of symbols included in a slot in which a PUSCH or SRS, which is an uplink transmission, is transmitted. For example, the number of symbols included in a slot in which a PUSCH or SRS is transmitted is 14 when a normal CP is set, and is 12 when an extended CP is set.

[0243] In FIG. 25, the subcarrier spacing of the PDCCH transmitting the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing for PUSCH or SRS transmission is 30 kHz (μ UL = 1). That is, one uplink symbol may contain approximately two uplink symbols, and S CI is 14. In FIG. 25, Y is 7. That is, 7 symbols may be included in the reference resource region.

[0244] FIG. 26, which is a second embodiment of the present invention, illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention.

[0245] The subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing for PUSCH or SRS transmission is 60 kHz (μ UL = 2). That is, one uplink symbol may include approximately four uplink symbols. CI may be 14. In this case, according to the first embodiment of Fig. 25, the value of Y is 3.5, which is not a natural number. Therefore, a method for determining Y is required.

[0246] Specifically, if the subcarrier spacing of the downlink BWP in which the PDCCH is received is smaller than the subcarrier spacing for uplink transmission, 'Y' may be determined by the following mathematical formula:

[0247] Y=ceil(2^(μ DL -μ UL )*SCI )

[0248] That is, it includes all symbols that are partially included in the uplink reference resource, so 4 symbols may be included instead of 3.5 symbols.

[0249] In FIG. 26, the subcarrier spacing of the PDCCH transmitting the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing for PUSCH or SRS transmission is 60 kHz (μ UL = 2). The uplink reference resources corresponding to the first and second uplink preemption indicators do not overlap with each other by any symbols. However, the uplink reference resources corresponding to the second and third uplink preemption indicators overlap by one symbol. Thus, further interpretation of the overlapping symbols is required.

[0250] FIG. 27, which is a third embodiment of the present invention, illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention.

[0251] Specifically, if the subcarrier spacing of the downlink BWP in which the PDCCH is received is smaller than the subcarrier spacing for uplink transmission, 'Y' may be determined by the following mathematical formula:

[0252] Y=floor(2^(μ DL -μ UL )*S CI )

[0253] According to the above mathematical formula, symbols that are partially included in the uplink reference resource may be excluded, so that 3 symbols may be included in the reference resource region instead of 3.5 symbols.

[0254] In FIG. 27, the subcarrier spacing of the PDCCH transmitting the uplink preemption indicator is 15 kHz (μ DL=0), and the subcarrier spacing for PUSCH or SRS transmission is 60 kHz (μ UL = 2). The uplink reference resources corresponding to all uplink preemption indicators do not have overlapping symbols. However, there is one symbol that is not included between the uplink reference resources corresponding to the first and second UL CIs. Therefore, PUSCH or SRS transmission is not canceled (or interrupted) in this symbol.

[0255] FIG. 28, which is a fourth embodiment of the present invention, illustrates yet another example of a method for determining the number of symbols included in a resource indicated by preemption according to an embodiment of the present invention.

[0256] Specifically, if the subcarrier spacing of the downlink BWP in which the PDCCH is received is smaller than the subcarrier spacing for uplink transmission, 'Y' may be determined in the same manner as in the second embodiment of FIG.

[0257] However, unlike the second embodiment, symbols included in the reference resource region of a previous uplink preemption indicator are not included in subsequent reference resource regions. That is, symbols partially included in the reference resource region in the second embodiment may be included in any one of the uplink reference resources. Therefore, in the fourth embodiment, there may be a reference resource region including 3 symbols and a reference resource region including 4 symbols instead of 3.5 symbols.

[0258] In FIG. 28, the subcarrier spacing of the PDCCH transmitting the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing for uplink PUSCH or SRS transmission is 60 kHz (μ UL= 2). The uplink reference resources corresponding to the second and third uplink preemption indicators may include different numbers of symbols. One symbol included in the uplink reference resource corresponding to the second uplink preemption indicator is not included in the uplink reference resource corresponding to the next, third uplink preemption indicator. Therefore, in this case, the uplink reference resources corresponding to all uplink preemption indicators do not have overlapping symbols.

[0259] In yet another embodiment of the present invention, the terminal DL -μ UL )*S CI Here, the configuration by the higher layer is based on the subcarrier spacing (μ DL ), the subcarrier spacing (μ UL ), the number of symbols per slot (N symb ), information about the period and offset of the PDCCH for transmitting the uplink preemption indicator, or S CI It can contain at least one of the values.

[0260] Downlink symbols may be excluded from the reference resource region for canceling uplink transmission. In this case, the downlink symbols may be symbols designated as downlink symbols by the semi-static DL / UL configuration. In addition, symbols for receiving SS / PBCH blocks may also be excluded from the reference resource region.

[0261] Symbols according to the semi-static DL / UL configuration and symbols for receiving SS / PBCH blocks may be limited to cell-common configured symbols, i.e., dedicated configured symbols are not excluded, and only cell-common configured downlink symbols and symbols for receiving SS / PBCH blocks can be excluded from the reference resource region.

[0262] The terminal can exclude symbols corresponding to the SS / PBCH configuration assumed at the time of initial access from the reference resource region. Only if the SS / PBCH is not separately configured, the terminal can exclude symbols corresponding to the SS / PBCH configuration assumed at the time of initial access from the reference resource region.

[0263] An uplink preemption indicator transmitted on one PDCCH can include uplink transmission cancellation information for multiple cells. In this case, a method for determining the reference resource region of multiple cells is required. To determine the time region of the reference resource region, the following four pieces of information are required:

[0264] The uplink preemption indicator transmitted by one PDCCH may include information for canceling uplink transmission for at least one cell. In this case, it is necessary to determine a reference resource region for at least one cell. That is, the uplink preemption indicator may provide the UE with additional information for one or more cells.

[0265] In this case, the following information may be required to determine the region on the time axis for the reference resource region.

[0266] - Index of the last symbol of the PDCCH: Because different UL cells may have different subcarrier spacings and CP types, the index of the last symbol on which the PDCCH is received may differ for each UL cell. Therefore, the uplink preemption indicator may include information related to the index of the last symbol of the PDCCH, which may be obtained together. For example, if there is one uplink symbol that overlaps with the last symbol on which the PDCCH is received in the UL cell, the symbol may be determined to be the last symbol on which the PDCCH is received.

[0267] If there are two or more uplink symbols that overlap with the last symbol at which PDCCH is received in an UL cell, the first symbol may be determined to be the last symbol at which PDCCH is received, or the last symbol may be determined to be the last symbol at which PDCCH is received.

[0268] - 'X' value, 'Y' value, and numerology for 'X' and 'Y' symbols (subcarrier spacing and CP type) for identifying the reference resource region: When an uplink preemption indicator transmitted via one PDCCH includes information for canceling uplink transmissions for multiple cells, the uplink preemption indicator may further provide information on 'X' value, 'Y' value, and numerology for 'X' and 'Y' symbols to the UE. That is, parameters related to the reference resource region may be further provided by the uplink preemption indicator.

[0269] -When the serving cell is configured with a supplementary uplink (SUL) carrier, the number of fields included in the DCI of a specific format for each serving cell for the SUL carrier, i.e., information related to the configuration of the uplink preemption indicator for the cross-cell.

[0270] - Payload size for DCI of a specific format

[0271] - Indication of time-frequency resources by higher layer signaling.

[0272] Among the above additional information, the 'X' value, 'Y' value, and information about the numerology for the 'X' and 'Y' symbols can be obtained in the following way:

[0273] First, the UE may be configured with an 'X' value, a 'Y' value, and numerology for the 'X' and 'Y' symbols for each cell. The UE can apply the configured 'X' value, 'Y' value, and numerology for the 'X' and 'Y' symbols to each cell. If multiple UL BWPs are configured for each cell, the 'X' value, 'Y' value, and numerology for the 'X' and 'Y' symbols may be interpreted individually by the UL BWP.

[0274] Second, the UE may be configured by the base station with an 'X' value, a 'Y' value, and numerology for the 'X' and 'Y' symbols. The UE can then interpret the UL BWP according to the configured 'X' value, 'Y' value, and numerology for the 'X' and 'Y' symbols. For example, the UE may determine symbols included in a reference resource region according to the 'X' value, 'Y' value, and numerology for the 'X' and 'Y' symbols in a first UL cell, and determine symbols of other UL cells that overlap with the reference resource region as the reference resource region of the other UL cells. If the overlapping region is a portion of a symbol but not the entire symbol, the symbol may or may not be included in the reference resource region. To prevent a situation in which some symbols overlap, the subcarrier spacing may be set to the lowest value.

[0275] For example, when the subcarrier spacing is set to 15 kHz, it is not necessary for only some symbols of the 30 kHz and 60 kHz UL cells to be included.

[0276] In other words, the values ​​of 'X' and 'Y' may be determined based on the smallest value of the subcarrier spacing between the UL cell and the DL cell. For example, as described above, the value of 'X' may be determined based on the processing time, and in this case, the processing time may be determined based on the smallest value of the offset value set by the upper layer, the smallest value of the subcarrier spacing between the UL cell and the DL cell, and the smallest value of the smallest value of the subcarrier spacing of the UL cell.

[0277] In this case, the offset value set by the higher layer may be used to determine the first symbol of the reference resource region from the last symbol for the PDCCH of the DCI when a specific format of DCI is applied to cancel uplink transmission.

[0278] Alternatively, when one 'X' value, 'Y' value, and numerology for the 'X' and 'Y' symbols are set, the same 'X' and 'Y' values ​​may be applied to each of multiple UL cells, but the subcarrier spacing and CP type may be interpreted according to the UL BWP of the applied UL cell. For example, in a first UL cell, the subcarrier spacing and CP type for the 'X' symbols and 'Y' symbols may be determined by the numerology of the first UL cell, and in a second UL cell, the subcarrier spacing and CP type for the 'X' symbols and 'Y' symbols may be determined by the numerology of the second UL cell.

[0279] In this case, since the subcarrier spacing between the first UL cell and the second UL cell may be different, the 'X' and 'Y' values ​​of the first UL cell and the second UL cell may be the same, but the absolute times may be different.

[0280] A specific description will be given below with reference to FIGS.

[0281] 29 to 31 illustrate an example of a method for determining resources indicated by preemption according to an embodiment of the present invention.

[0282] Figure 29 shows an example of a method for determining resources indicated by preemption according to an embodiment of the present invention. Referring to Figure 25, an 'X' value, a 'Y' value, and numerology for the 'X' and 'Y' symbols of each cell may be configured by a base station to a terminal. In this case, as shown in Figure 25, the terminal may recognize that the start symbol of the reference resource region is located after the set 'X' symbols from the last symbol that overlaps with the symbol receiving the PDCCH among the symbols of the cell to which the uplink preemption indicator is applied, and that the 'Y' symbols from the start symbol constitute the reference resource region. In this case, the subcarrier spacing and CP type for the 'X' and 'Y' symbols may be applied according to the configured values.

[0283] 30 illustrates yet another example of a method for determining resources indicated by preemption according to an embodiment of the present invention. Referring to FIG. 26, a UE may receive 'X' and 'Y' values ​​of a cell from a base station. In this case, the UE may determine that the start symbol of the reference resource region is located after 'X' symbols from the last symbol at which an uplink preemption indicator is received through PDCCH detection in a DL cell, and that 'Y' symbols from the start symbol are included in the reference resource region.

[0284] Here, the 'X' and 'Y' symbols may be subject to the subcarrier spacing and CP type set in the DL cell. The reference resource region of the UL cell may include symbols that overlap with the reference resource region determined in the DL cell. In this case, as described above, symbols in the reference resource region that only partially overlap may or may not be included in the reference resource region.

[0285] 31 illustrates yet another example of a method for determining resources indicated by preemption according to an embodiment of the present invention. Referring to FIG. 27, a UE may receive from a base station 'X' and 'Y' values ​​of a cell, and subcarrier spacing and CP type for the 'X' and 'Y' symbols. Referring to FIG. 27, UL cell #0 represents a cell to which the set subcarrier spacing and CP type are applied. The UE may determine the last symbol of uplink symbols that overlaps with the last symbol for which an uplink preemption indicator is received. Then, the UE may determine that the first symbol constituting the reference resource region is located 'X' symbols after the determined last symbol, and that 'Y' symbols from the first symbol are included in the reference resource region. In this case, the subcarrier spacing and CP type for the 'X' and 'Y' symbols are the same as those set for UL cell #0.

[0286] The UE, which has determined the reference resource region in UL cell #0 based on the values ​​of 'X' and 'Y', can determine the reference resource region of UL cell #1, where uplink transmission cancellation is actually performed in response to the uplink preemption indicator, based on UL cell #0. Specifically, the UE can determine the region in UL cell #1 that overlaps with the reference resource region of UL cell #0 as the reference resource region where uplink transmission is actually canceled.

[0287] In the previous embodiment, it was explained that the values ​​of 'X' and 'Y' may both be set by RRC or DCI, but one of the two values ​​may not be set by RRC or DCI and may be determined based on the subcarrier spacing of the terminal.

[0288] For example, the value of 'X' may be determined based on the processing time according to the subcarrier spacing, where the subcarrier spacing may be the subcarrier spacing of the UL cell or the subcarrier spacing set by the RRC.

[0289] Alternatively, the value of 'X' may be determined based on the processing time as described above, and in this case, the processing time may be determined based on the smallest value among the offset value set by the upper layer, the minimum value of the subcarrier spacing between the UL cell and the DL cell, and the minimum value of the subcarrier spacing between the UL cell.

[0290] In this case, the offset value set by the higher layer may be used to determine the first symbol of the reference resource region from the last symbol for the PDCCH of the DCI when a specific format of DCI is applied to cancel uplink transmission.

[0291] Since the number of bits of the uplink preemption indicator of the DCI is limited by the size of the DCI, the area in the reference resource area where uplink transmission is canceled must be indicated within the limited number of bits.

[0292] Therefore, the reference resource region may be divided into a plurality of regions (or groups) on the time axis and the frequency axis. CI The PRB may be divided into T parts each containing one PRB, and on the frequency axis, it may be divided into K parts each containing at least one PRB.

[0293] In this case, the total number of divided regions, T*K, may be equal to the number of bits of the uplink preemption indicator. For example, if the reference resource region is divided into T regions on the time axis, the reference resource region may be divided into T regions on the frequency axis taking into account the number of bits of the uplink preemption indicator. That is, if the number of bits of the uplink preemption indicator is 8 and the reference resource region is divided into four regions on the time axis, the reference resource region may be divided into two regions on the frequency axis. In this case, each divided region may include at least one symbol on the time axis and at least one PRB on the frequency axis, and the number of regions divided on the time axis may be provided to the UE by RRC configuration information, etc. In each resource region divided from the reference resource region, each bit (1 bit) of the uplink preemption indicator may indicate whether uplink transmission is to be canceled.

[0294] When the reference resource region is divided into multiple regions, the reference resource regions indicated by uplink preemption indicators transmitted by different PDCCHs may partially or completely overlap each other as shown in FIG. 28. In this case, two or more G CI When a symbol set is set by grouping symbols, symbol sets in different reference resource regions may not be grouped in the same way.

[0295] In this case, the UE may receive multiple uplink preemption indicators for the overlapping regions and must determine which symbol the uplink transmission corresponding to should be canceled.

[0296] FIG. 32 shows an example of receiving multiple preemptions according to an embodiment of the present invention.

[0297] 32, when a reference resource region includes 14 symbols and is divided into groups of two symbols on the time axis, the uplink preemption indicator may indicate whether uplink transmission for the corresponding resource region is to be canceled by one bit. In this case, when the value of one bit is 1, uplink transmission for the corresponding resource region may be canceled.

[0298] In the first uplink preemption indicator UL CI#0 in Figure 32, another UL signal overlaps with the first symbol of the sixth symbol set, so the bit value for that symbol set may be set to 1. In the second preemption indicator UL CI#1, another UL signal overlapping with UL CI#0 is located at the second symbol of the second symbol set. Therefore, the bit value corresponding to the second symbol set may be set to 1. However, since there is no corresponding uplink transmission in the third symbol set, the bit value corresponding to that symbol set may be set to 0.

[0299] In this case, the terminal needs to interpret symbols for resource areas with bit values ​​set to 1 and resource areas with bit values ​​set to 0.

[0300] As a first embodiment, the terminal can always operate based on the uplink preemption indicator of the PDCCH that was received last. That is, in FIG. 32, when the terminal receives both UL CI#0 and UL CI#1, the terminal can operate based on the last-received UL CI#1. Therefore, since the bit value corresponding to the third symbol set in UL CI#1 is set to 0, the terminal does not need to cancel uplink transmission in the corresponding resource region. If the terminal fails to receive UL CI#1 and receives only UL CI#0, the bit value corresponding to the sixth symbol set is set to 1, so the terminal does not need to cancel uplink transmission in the corresponding resource region and does not need to transmit an uplink signal.

[0301] As a second embodiment, the terminal can cancel uplink transmissions that overlap with the symbols instructed to be canceled in one UL CI. For example, in Figure 28, if the bit value corresponding to the sixth symbol set of UL CI#0 is set to 1 and the bit value corresponding to the second symbol set of IL CI#1 is instructed to be 1, the terminal must cancel uplink transmissions in resource regions that overlap with the corresponding resource region by at least one symbol.

[0302] As mentioned above, the reference resource area is G CI The resource region may be divided into T groups of T symbols, and each divided resource region may be indicated as being either canceled or not for uplink transmission by one bit of the uplink preemption indicator. In this case, if reference resource regions indicated by different uplink preemption indicators overlap, a method for dividing the reference resource region is required. For example, a first uplink preemption indicator may group four symbols 1, 2, 3, and 4 into {1,2} and {3,4}, while a second uplink preemption indicator may group four symbols 2, 3, 4, and 5 into {2,3} and {4,5}.

[0303] In this case, to cancel the uplink transmission scheduled for the second symbol, the uplink transmission of {1,2} needs to be canceled by the first uplink preemption indicator, and the uplink transmission of {2,3} needs to be canceled by the second uplink preemption indicator. However, in this case, all of the uplink transmissions of symbols 1, 2, and 3 may be canceled. Therefore, when different reference resource regions are divided on the time axis, the reference resource region needs to be divided on the time axis based on one reference symbol (e.g., the first symbol of a slot). That is, the four symbols of the first uplink preemption indicator need to be grouped into {1,2} and {3,4} based on one symbol, and the four symbols of the second uplink preemption indicator need to be grouped into {2}, {3,4}, and {5} based on one symbol.

[0304] Or, when the reference resource regions indicated by different uplink preemption indicators overlap, two or more G CI When the symbols are grouped to form a symbol set, the symbol sets of different reference resource regions may be configured not to be grouped together. In this case, the terminal may group the symbol sets of different reference resource regions together, regardless of the reference resource region. CI Symbols may be grouped to form a symbol set. The UE may also determine a reference resource region using the 'X' and 'Y' values. The determined reference resource region may include only a portion of the symbol set, and even if only a portion is included, it may be determined that the entire symbol set is included in the reference resource region.

[0305] 33 shows another example of receiving multiple preemptions according to an embodiment of the present invention. CIIf the value of is 2, two symbols can be grouped to form a symbol set. In UL CI#1, the first and last symbols of the 'Y' symbols contain only a part of the configured symbol set. In this case, the configured symbol set may be included in the reference resource area.

[0306] FIG. 34 shows yet another example of a case where multiple preemptions are received according to an embodiment of the present invention.

[0307] Referring to FIG. 34, the reference resource area is, as described above, G CI The resource regions may be grouped by symbols and divided into T regions, and each divided resource region may be indicated as being either canceled or not for uplink transmission by one bit of the uplink preemption indicator. In this case, reference resource regions indicated by different uplink preemption indicators may overlap. When different reference resource regions overlap, two or more G CI When symbols are grouped to form a symbol set, the symbol sets of different reference resource regions may not be aggregated identically. CI When symbols are aggregated into a symbol set, symbol sets of different reference resource regions can be aggregated into the same symbol set. For this purpose, the start symbol of the reference resource region may be delayed (Alt1 in FIG. 34) or advanced (Alt2 in FIG. 34). For example, as shown in Alt1 in FIG. 34, when determining the start position of the reference resource region in UL CI#1, the position of the start symbol of the reference resource region is delayed by S symbols. Here, S=mod(P,G CI ) = 1 symbol. P is the number of symbols in the monitoring cycle for the PDCCH of the DCI including the uplink preemption indicator. When the reference resource region is delayed by one symbol, it can be seen that the boundary separating the symbol sets of the reference resource regions of UL CI#0 and UL CI#1 is aligned. For example, as shown in Alt2 of Figure 34, the position of the start symbol of the reference resource region in UL CI#1 is GCI -S symbols earlier. Similarly, S=mod(P,G CI )=1 symbol, and P is the number of symbols in the monitoring period for the PDCCH of the DCI including the uplink preemption indicator.

[0308] Yet another problem to be solved by the present invention relates to a method for excluding downlink symbols when the downlink symbols are located in the reference resource region. A terminal may be configured by a base station as to whether each symbol is a downlink symbol, an uplink symbol, or a flexible symbol. The terminal expects to receive downlink signals in the downlink symbols but not transmit uplink signals. The terminal expects to transmit uplink signals in the uplink symbols but not receive downlink signals. The terminal may be instructed whether the flexible symbols are downlink symbols or uplink symbols by scheduling of other signals or DCI format2_0 including dynamic SFI (dynamic SFI).

[0309] The uplink preemption indicator may be used to indicate symbols in uplink signals and channels for which uplink transmission should be canceled, so that downlink symbols do not need to be canceled for transmission or reception by the uplink preemption indicator.

[0310] First, as described above, the number of symbols 'Y' included in the reference resource region may be configured by the base station by RRC configuration information or DCI, and the terminal can configure the reference resource region based on the configured 'Y' value.

[0311] In a first embodiment, the terminal may select 'Y' symbols located after 'X' symbols from the last symbol of the PDCCH including the uplink preemption indicator, regardless of the downlink / uplink symbol configuration. Then, symbols set as downlink symbols may be excluded from the selected 'Y' symbols. The remaining L symbols (less than or equal to Y) excluding the downlink symbols from the 'Y' symbols may be included in the reference resource region. Furthermore, symbols for receiving SS / PBCH blocks may be excluded from the L symbols.

[0312] In a second embodiment, the terminal may select 'Y' symbols located 'X' symbols after the last symbol of the PDCCH including the uplink preemption indicator. In this case, the selected 'Y' symbols may be UL or flexible symbols excluding downlink symbols. Furthermore, the 'Y' symbols may be symbols excluding symbols for receiving SS / PBCH blocks. That is, in the second embodiment, the terminal may select 'Y' symbols located 'X' symbols after the last symbol of the PDCCH including the uplink preemption indicator, and the selected 'Y' symbols may be configured by the base station or may be symbols excluding symbols for receiving SS / PBCH blocks and / or downlink symbols from a plurality of symbols constituting a PDCCH monitoring period.

[0313] In the first and second embodiments, the symbols and / or downlink symbols for receiving the excluded SS / PBCH blocks may be limited to symbols configured commonly for the cells.

[0314] In the first embodiment, the number L of symbols included in the reference resource region is smaller than 'Y', so that the cancellation of uplink transmission can be instructed more precisely and with fewer bits. In the second embodiment, the reference resource region always includes 'Y' symbols, so that the cancellation of uplink transmission can always be instructed with the same granularity and number of bits. However, in the first and second embodiments, the number of included symbols varies depending on the downlink symbol configuration, so that the boundaries of symbol sets between different reference resource regions may not coincide after grouping of the symbol sets.

[0315] Therefore, in the third embodiment, the UE can select 'Y' symbols located after 'X' symbols from the last symbol of the PDCCH including the uplink preemption indicator, regardless of the downlink / uplink symbol configuration. Then, the 'Y' symbols are divided into 'Y' symbols in the set granularity G. CI The symbols may be grouped into symbol sets by

[0000] . Then, if all symbols included in one symbol set are set as downlink symbols, the symbol set may be excluded from the reference resource region. As a result, the bit of the uplink preemption indicator corresponding to the symbol set in which all symbols are set as downlink symbols may always be set to a value of '0', which does not cancel uplink transmission.

[0316] 35 and 36 show an example of a method for dividing a reference resource region into multiple regions that may be indicated by an uplink preemption indicator for canceling uplink transmission.

[0317] Since the uplink preemption indicator is transmitted in the DCI, the maximum number of bits may be limited, and therefore the number of bits of the uplink preemption indicator may be insufficient to correspond each symbol and each PRB in the reference resource region to each bit of the uplink preemption indicator and to instruct the cancellation of uplink transmission.

[0318] Therefore, in order to indicate all regions of the reference resource region using each bit of the uplink preemption indicator, the reference resource region can be divided into a plurality of regions each including at least one symbol and at least one PRB.

[0319] A method for dividing a reference resource region into multiple regions will now be described.

[0320] FIG. 35 illustrates an example of a method for dividing the time-frequency domain of resources indicated by preemption according to an embodiment of the present invention.

[0321] When the terminal selects 'Y' symbols constituting the reference resource region, the number of symbols and / or the number of symbol sets included in the reference resource region may vary depending on the first to third embodiments. For example, the number of bits included in the uplink preemption indicator may be B bits, and the number of symbol sets in the reference resource region may be S. In this case, if B / S=F, the PRBs in the frequency domain may be grouped and configured into F PRB sets as shown in FIG. 35. In FIG. 35, the value of S is 7, and the value of B is 28. Therefore, the value of F can be 4.

[0322] The terminal may be configured with K PRBs included in the reference resource region from the base station in the following manner.

[0323] First embodiment: The resource may be configured in the form of a resource indication value (RIV) in which the index of the starting RB from a common reference PRB of a UL cell and the number of consecutive RBs from the starting RB are both encoded. That is, the terminal can receive RRC configuration information including the RIV value from the base station, and can recognize the index of the starting RB of the reference resource region based on the common reference PRB and the number of consecutive RBs from the starting RB using the RIV value. In this case, the index of the starting RB may be obtained based on the starting RB and an offset value of the common reference PRB.

[0324] When the terminal uses the received RIV value to obtain the index of the starting PRB on the frequency axis of the reference resource region and the number of consecutive RBs, the size of the BWP may be assumed to be the maximum size of 275 RBs, and the subcarrier spacing may be set by the base station.

[0325] Second embodiment: PRBs included in the reference resource region may be configured to the UE using an RIV scheme in which the starting RB index and the number of consecutive RBs from the lowest PRB of the UL BWP are both encoded. That is, in order to configure PRBs on the frequency axis of the reference resource region for the UE, the base station may transmit to the UE, using RRC configuration information, an RIV value in which the starting RB index and the number of consecutive RBs are both encoded based on the lowest PRB of the UL BWP.

[0326] The UE can recognize the PRB configuration of the reference resource region based on the received RIV. In this case, the BWP size of the RIV may be assumed to be the number of RBs included in the UL BWP, and the subcarrier spacing may be set by the base station as the subcarrier spacing of the UL BWP. The UL BWP may be the UL BWP with the lowest BWP ID of the cell.

[0327] Third embodiment: PRBs included in the reference resource region may be indicated based on a bitmap, i.e., RBs of the UL BWP are grouped into RB groups (RBGs), and PRBs included in the reference resource region can be indicated to the UE by respective bits corresponding to each RBG.

[0328] In other words, the base station may group RBs on the frequency axis of the reference resource region into a plurality of RB groups each consisting of one or more RBs, and may notify the terminal of each RB group in a bitmap manner. The terminal may receive from the base station a bit indicating an RB group constituting the reference resource region with a 1-bit value, and may recognize the RBs constituting the reference resource region based on the value of the received bit.

[0329] When there are K PRBs in the frequency domain, F PRB sets may be configured as follows. First, KF*floor(K / F) PRB sets may include ceil(K / F) PRBs. The remaining F-(KF*floor(K / F)) PRB sets may include floor(K / F) PRBs. In other words, F PRB sets may be configured from F-(KF*floor(K / F)) PRB sets each including floor(K / F) PRBs and the remaining F-(KF*floor(K / F)) PRB sets each including ceil(K / F) PRBs.

[0330] Alternatively, in yet another method of configuring F PRB sets when there are K PRBs in the frequency domain, the K PRBs may be grouped into Q RB groups. In this case, the RBGs may be grouped in a manner similar to that used in resource allocation type 0. That is, up to J RBs are aggregated in consideration of the PRB grid. Here, J is the number of PRBs included in the RBG configured in the UL BWP. The Q RBGs are grouped into F PRB sets. Specifically, first, QF*floor(Q / F) PRB sets include ceil(Q / F) RBGs, and the remaining F-(QF*floor(Q / F)) PRB sets include floor(Q / F) RBGs.

[0331] FIG. 36 illustrates yet another example of a method for dividing the time-frequency domain of resources indicated by preemption according to an embodiment of the present invention.

[0332] Referring to FIG. 36, when the number of bits B of the uplink preemption indicator is not an integer multiple of the number of symbols S in the reference resource region, the PRBs on the frequency axis in the reference resource region may be grouped differently depending on the symbol set.

[0333] Specifically, if the number of bits B of the uplink preemption indicator is not an integer multiple of the number of symbols S of the reference resource region, i.e., if B is not divisible by S, the PRBs of the reference resource region may be configured as a PRB set in the following manner.

[0334] First embodiment: Every symbol set may be divided into F PRB sets. In this case, F may be floor(B / S). For example, if B is '28' and S is '8', the value of F may be 3. That is, each symbol set may be divided into three PRB sets on the frequency axis. In this case, only S*F=3*8=24 bits are valid, and the remaining 4 bits may not be used for canceling uplink transmission because there is no corresponding symbol-PRB set. That is, the remaining 4 bits may be unused.

[0335] Second embodiment: Of the S symbol sets, BS*floor(B / S) symbol sets may be divided into F1=ceil(B / S) PRB sets on the frequency axis, and the remaining S-(BS*floor(B / S)) symbol sets may be divided into F2=fllo(B / S) PRB sets. For example, as shown in Figure 53, BS*floor(B / S)=28-8*floor(28 / 8)=4 symbol sets may be divided into ceil(B / S)=ceil(28 / 8)=4 PRB sets, and the remaining S-(BS*floor(B / S))=4 symbol sets may be divided into floor(B / S)=floor(28 / 8)=3 PRB sets.

[0336] That is, in Figure 36, the first four symbol sets are divided into F1 PRB sets on the frequency axis, and the last four symbol sets are divided into F2 PRB sets on the frequency axis. Conversely, the first four symbol sets may be divided into F2 PRB sets on the frequency axis, and the last four symbol sets may be divided into F1 PRB sets on the frequency axis.

[0337] Also, each symbol set may be alternately divided into F1 PRB sets and F2 PRB sets on the frequency axis. Also, in 32, the boundary dividing the F1 PRB sets and the boundary dividing the F2 PRB sets on the frequency axis are shown as different, but these may also be aligned. That is, if F1-F2=1, when dividing into F2 PRB sets, the F1 PRB sets may be divided first, and two of the F1 PRB sets may be grouped to form one set. Conversely, when dividing F1 PRB sets on the frequency axis, the F2 PRB sets may be divided first, and one of the F2 PRB sets may be divided into two sets.

[0338] In the case of different numerologies

[0339] The problem to be solved by the present invention relates to a situation in which the numerology of a PDCCH that transmits an uplink preemption indicator (UL CI) differs from the numerology of a PUSCH or SRS transmission for which this UL CI indicates the cancellation (or suspension) of transmission.

[0340] That is, an indicator for instructing the cancellation of uplink transmission may be transmitted in downlink transmission. In this case, the subcarrier spacing of the uplink cell may be different from the subcarrier spacing of the downlink cell.

[0341] Specifically, the numerology may include a subcarrier spacing or a cyclic prefix, where the carrier spacing is 15*2 kHz, μ is a subcarrier spacing configuration value having values ​​of 0, 1, 2, 3, etc., and the CP type may be distinguished into a normal CP and an extended CP.

[0342] For normal CP, 1*2 -μ One slot of ms can contain 14 OFDM symbols, and in the case of extended CP, it is 1*2 -μ One slot of 1 ms may contain 12 OFDM symbols. The extended CP may be configured for 60 kHz subcarrier spacing (μ=2). Such numerology may be configured in the BWP of the uplink carrier and the BWP of the downlink carrier.

[0343] Hereinafter, the subcarrier spacing of PUSCH or SRS transmitted in the uplink BWP is μ UL , the subcarrier spacing of the PDCCH of the uplink preemption indicator received in the downlink BWP is μ DL Let's say.

[0344] If the numerology of the PDCCH that transmits the uplink preemption indicator is different from the numerology of the uplink transmission (e.g., PUSCH or SRS) that is canceled (or interrupted) by the uplink preemption indicator, the numerology for the reference resource region may be determined in the following manner.

[0345] The reference resource region is a set of uplink resources for which uplink transmission may be canceled by an uplink preemption indicator. Here, the uplink resources may include PRBs and symbols. The PRBs may be some or all of the PRBs included in the BWP of the uplink cell. Specifically, the UE may be configured by the base station as to which PRBs of the BWP of the uplink cell are included in the reference resource region.

[0346] Specifically, the UE may set an absolute radio-frequency channel number (ARFCN) as the subcarrier having the lowest index of the common reference PRB. The subcarrier having the lowest index may be referred to as a reference point or point A. The common reference PRB is a PRB including the subcarrier having the lowest index.

[0347] When the RBs included in the reference resource region are configured by the base station, the terminal can assume that there are 275 consecutive PRBs including the common reference PRB. The 275 PRBs do not all have to be PRBs that can be transmitted in the uplink. The terminal can be configured which PRBs among the 275 PRBs are included in the reference uplink resource. That is, the terminal can determine the index of the starting RB (RB index) among the 275 PRBs. start ) and the number of RBs (L RBs The PRBs included in the reference resource area among the 275 PRBs may be set by a resource indication value (RIV) method in which the PRBs are encoded together with the PRBs. Here, when interpreting the RIV, the size of the BWP may be assumed to be 275 RBs.

[0348] Specifically, the RIV can be expressed as the following mathematical formula [Formula 9]: This mathematical formula is [Formula 8].

[0349]

number

[0350]

number

[0351] In order to determine the PRBs included in the reference resource region, the subcarrier spacing needs to be determined. The subcarrier spacing for determining the reference resource region is the subcarrier spacing (μ DL ) may be used. DL ) is the subcarrier spacing (μ UL ) may be the same as or different from

[0352] Suppose the subcarrier spacing (μ DL ) and the subcarrier spacing (μ UL ) are different, the PRBs included in the reference resource region determined by the RIV method may be determined in the following manner.

[0353] 37 to 39 show methods for determining PRBs to be included in a reference resource region when the subcarrier spacing of the PDCCH differs from the subcarrier spacing of uplink transmission.

[0354] FIG. 37 illustrates an example of a PRB indicated by preemption according to an embodiment of the present invention.

[0355] In Figure 37, the RB of the reference resource region on the frequency axis start = 5, and L RBs = 8. In this case, the common reference PRB is O carrier The PRB includes the PRB, and the index of this PRB is 0. As described above, the reference resource region (RIV-indicated reference UL resource) configured with PRBs indicated by the RIV transmitted by the higher layer signaling of the base station is determined based on the subcarrier spacing (μ DL ) that is, the subcarrier spacing (μDL ) Therefore, it is necessary to determine the uplink PRBs actually included in the reference resource area from the reference resource area configured with PRBs indicated by the RIV.

[0356] FIG. 38 illustrates an example of a method for determining subcarrier spacing for an uplink according to an embodiment of the present invention.

[0357] FIG. 38(a) shows the subcarrier spacing (μ DL ) is the subcarrier spacing (μ UL For example, when the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is greater than 30 kHz (μ DL =1), and the subcarrier spacing of the uplink PUSCH or SRS transmission is 15 kHz (μ UL = 0). DL The bandwidth of one PRB determined by the above formula is the subcarrier spacing (μ UL ) of the PDCCH that transmits the uplink preemption indicator. DL ) The bandwidth of one PRB is determined to be 2^(μ DL -μ UL ) uplink transmissions, that is, PUSCH or SRS transmission subcarrier spacing (μ UL ) can include a PRB determined as follows.

[0358] In one embodiment of the present invention, the subcarrier spacing (μ DL ) is the subcarrier spacing (μ UL ) the method for determining the uplink reference resource is as follows.

[0359] First embodiment: Subcarrier spacing (μ DL ) may be used to determine the reference resource region. The uplink PRBs actually included in the reference resource region may be determined as all PRBs included in the band occupied by the reference resource region indicated by the RIV. For example, 2^(μ DL -μ UL ) uplink PRBs may be included in the actual reference resource region.

[0360] Second embodiment: The RIV is a subcarrier spacing (μ DL ), and the reference resource region indicated by the interpreted RIV may be determined. Then, the starting RB index (RB start UL ) and the number of consecutive PRBs (L RBs UL ) is the RB obtained from RIV start and L RBs Based on this, it may be obtained by the following mathematical formula:

[0361] -RB start UL =2^(μ DL -μ UL )*RB start

[0362] -L RBs UL =2^(μ DL -μ UL )*L RBs

[0363] The terminal determines the subcarrier spacing (μ UL ) to the common reference RB, starting from the RB index (RB start UL ) PRB to L RBs ULIt can be determined that PRBs are included in the uplink reference resource.

[0364] FIG. 38(b) shows the subcarrier spacing (μ DL ) is the subcarrier spacing (μ UL For example, when the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing of the uplink PUSCH or SRS transmission is 30 kHz (μ UL =1).

[0365] The subcarrier spacing (μ UL The bandwidth of one PRB determined as ) is the subcarrier spacing (μ DL ) can include multiple PRBs determined as follows. More precisely, the subcarrier spacing (μ UL The bandwidth of one PRB determined as ) is the subcarrier spacing (μ DL ) was determined to be 2^(μ UL -μ DL ) PRBs.

[0366] In one embodiment of the present invention, the subcarrier spacing (μ DL ) is the subcarrier spacing (μ UL ) is smaller than the method for determining the uplink reference resource as follows.

[0367] First, the subcarrier spacing (μ DL) may be used to interpret the RIV, and a reference resource region on the frequency axis indicated by the RIV may be determined. The uplink PRBs actually included in the reference resource region may be determined as all PRBs that are wholly or partially included in the band occupied by the reference resource region determined based on the RIV.

[0368] Second, the subcarrier spacing (μ DL ) may be used to interpret the RIV, and a reference resource region on the frequency axis indicated by the RIV may be determined. The uplink PRBs actually included in the reference resource region may be determined as all PRBs entirely included in the band occupied by the reference resource region indicated by the RIV.

[0369] Third, the subcarrier spacing (μ DL ) may be used to interpret the RIV, and a reference resource region on the frequency axis indicated by the RIV may be determined. Then, the starting RB index (RB start UL ) and the number of consecutive PRBs (L RBs UL ) is the RB obtained from RIV start and L RBs may be obtained from the following formula:

[0370] -RB start UL =floor(RB start / P)

[0371] -L RBs UL =ceil((L RBs +(RB start mod P)) / P)

[0372] Here, P is 2^(μ UL -μ DL ) The terminal determines the subcarrier spacing (μ UL) to the common reference RB, starting from the RB index (RB start UL ) PRB to L RBs UL It can be determined that PRBs are included in the uplink reference resource.

[0373] FIG. 39 illustrates yet another example of a method for determining uplink subcarrier spacing according to an embodiment of the present invention.

[0374] 39 is a diagram illustrating a method for determining an uplink reference resource according to the third embodiment. start =5, L RBs = 8, P = 2. start UL =floor(RB start / P)=floor(5 / 2)=2. L RBs UL =ceil((L RBs +(RB start mod P)) / P)=ceil((8+5mod2)) / 2)=5.

[0375] Therefore, using the subcarrier spacing of PUSCH or SRS transmission, which is uplink transmission, the index of the starting RB from the common reference RB is 2, and 5 PRBs may be included in the reference resource region.

[0376] In the first and second embodiments, the terminal uses the RB indicated by the RIV. start and L RBs The value of is at least 2^(μ UL -μ DL ) that is, the terminal can expect the RB indicated by the RIV to have a value that is divisible by start and L RBs The value of is 2^(μ UL -μ DL) is not expected to have a value that is not divisible by . Such a restriction can prevent a situation in which an uplink PRB partially overlaps with a PRB included in the reference resource region on the frequency axis indicated by the RIV.

[0377] As a first embodiment, the subcarrier spacing (μ DL ) may be used to interpret the RIV and determine the reference resource region indicated by the RIV. The uplink PRBs actually included in the reference resource region may be determined as all PRBs that are wholly or partially included in the band occupied by the reference resource region indicated by the RIV.

[0378] 37 to 39, the offset value O carrier A method for determining the value is described.

[0379] O carrier is an offset value representing the number of RBs from the common reference PRB to the start RB for each subcarrier interval. carrier Identify unused RBs. carrier The value of is set for each cell. carrier The value of is set for each subcarrier spacing value of the cell.

[0380] Specifically, O carrier may be configured by a higher layer as follows: The system information block (SIB) may include FrequencyInforDL-SIB, which includes information about the downlink carrier and reception. FrequencyInforDL-SIB (or FrequencyInforDL) may include the following information:

[0381] - frequencyBandList: a list of one or more frequency bands to which the downlink carrier belongs

[0382] - offsetToPointA: Position of PointA

[0383] - scs-SpecificCarrierList: O for each subcarrier interval carrier The network must configure scs-SpecificCarrierList for all subcarrier spacings used for downlink BWP in the cell.

[0384] The SIB may also include a FrequencyInforUL-SIB containing information about the basic uplink carrier and transmission. The FrequencyInforUL-SIB (or FrequencyInforUL) may include the following information:

[0385] - frequencyBandList: a list of one or more frequency bands to which the downlink carrier belongs

[0386] - offsetToPointA: Position of PointA

[0387] - scs-SpecificCarrierList: O for each subcarrier interval carrier The network must configure scs-SpecificCarrierList for all subcarrier spacings used in the uplink BWP of the cell.

[0388] With this higher layer configuration, the device knows:

[0389] 1) Point A position of each carrier (this point A is the same regardless of the subcarrier spacing)

[0390] 2) Subcarrier spacing that can be used by each carrier (other subcarrier spacing cannot be used by the carrier).

[0391] 3) O due to subcarrier spacing of each carrier carrier Value(offsetToCarrier)

[0392] The UE is configured with a DL BWP for monitoring the uplink preemption indicator. Specifically, there is a DL BWP including a search space for monitoring the uplink preemption indicator, and the UE can use the subcarrier spacing of the DL BWP to determine the reference resource region of the uplink preemption indicator. This subcarrier spacing can be referred to as a reference subcarrier spacing.

[0393] For example, the reference subcarrier spacing may be included in the FrequencyInforUL-SIB (or FrequencyInforUL) of the uplink cell. As described above, the FrequencyInforUL-SIB (or FrequencyInforUL) is the O of the subcarrier spacing supported by the uplink cell. carrier Includes the value (offsetToCarrier).

[0394] If the reference subcarrier spacing is not a subcarrier spacing supported by the uplink cell, carrier The value may be determined as follows:

[0395] The subcarrier spacing of the terminal's Active BWP is SCS activeUL and SCS activeUL O carrier The value is O carrier,activeUL O carrier,activeUL is specified in the scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL). activeUL The subcarrier spacing of the DL BWP that monitors the uplink preemption indicator is the value (offsetToCarrier) set by SCS ref and the reference resource area indicated by the uplink preemption indicator is O carrier The value is O carrier,DL It may be.

[0396] FIG. 40 illustrates an example of a method for determining an offset value according to a subcarrier spacing supported in an uplink according to an embodiment of the present invention.

[0397] Referring to Figure 40, O carrier,DL may be obtained in the following way:

[0398] First embodiment: The terminal scales the value (offsetToCarrier) set according to the subcarrier spacing of the active UL BWP in the scs-SpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL) according to the reference subcarrier, and calculates the offset value of the reference resource region indicated by the uplink preemption indicator. carrier Value(O carrier,DL ) can be obtained.

[0399] Specifically, O carrier,DL is floor(O carrier,activeUL *S), where S=SCS activeUL / SCS ref Floor may be replaced by ceiling or round.

[0400] Second embodiment: The terminal sets the maximum subcarrier spacing value (hereinafter referred to as SCS) among the subcarrier spacings in the scs-SpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL). max ) The value (offsetToCarrier) set by the uplink preemption indicator is scaled according to the reference subcarrier spacing to obtain the O of the reference resource area indicated by the uplink preemption indicator. carrier Value(O carrier,DL ) can be obtained.

[0401] Specifically, O carrier,DL floor(O max *S), where S is the SCS max / SCS refwhere SCS max is the maximum subcarrier spacing value among the subcarrier spacings supported by the uplink cell, and is the maximum subcarrier spacing value among the subcarrier spacings indicated in scsSpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL). Floor may be replaced by ceil or round. max is a value (offsetToCarrier) set according to the maximum subcarrier spacing value among the subcarrier spacings in scsSpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL).

[0402] For example, if an uplink cell can use 15 kHz and 30 kHz as the subcarrier spacing, the offsetToCarrier corresponding to 30 kHz, which is the larger value of 15 kHz and 30 kHz, is O max In the second embodiment, even if the terminals of the uplink cells use UL BWPs with different subcarrier spacings, the same O carrier,DL This allows the frequency band of the same reference resource region to be obtained.

[0403] Third embodiment: The terminal determines the minimum subcarrier spacing value (hereinafter referred to as SCS) among the subcarrier spacings indicated by scs-SpecificCarrierList in FrequencyInforULSIB (or FrequencyInforUL). min ) is scaled to the reference subcarrier spacing, and the value (offsetToCarrier) set by the uplink preemption indicator is scaled to the reference resource area O carrier Value(O carrier,DL ) can be obtained. Specifically, O carrier,DL The value of floor(O min *S), where S is the SCS min / SCS ref where SCS minis the minimum value of the subcarrier spacing supported in the uplink cell, and is the minimum subcarrier value of the subcarrier spacing included in the scsSpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL). Floor may be replaced with ceil or round. min is a value (offsetToCarrier) set according to the minimum subcarrier value among the subcarrier values ​​included in the scsSpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL).

[0404] For example, if an uplink cell can use 15 kHz and 30 kHz as the subcarrier spacing, the offsetToCarrier corresponding to 15 kHz, which is the smaller of 15 kHz and 30 kHz, is O. min In the second embodiment, even if the terminals of the uplink cell use UL BWPs having different subcarriers, the same O carrier,DL As a result, the frequency band of the same reference resource region may be set for each terminal.

[0405] Fourth embodiment: The terminal determines the offset of the reference resource area indicated by the uplink preemption indicator based on the minimum value of the values ​​(offsetToCarrier) set according to the subcarrier spacing indicated by the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). carrier Value(O carrier,DL ) can be obtained. Specifically, O carrier,DL The value of floor(min_O carrier *S). The value of S can be obtained by min_SCS / SCS refHere, min_SCS is the subcarrier spacing corresponding to min_Ocarrier. That is, it is the subcarrier spacing value corresponding to the minimum value of the values ​​(offsetToCarrier) set by the subcarrier spacing values ​​included in the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). Floor may be replaced by ceil or round. Alternatively, O carrier,DL min_O carrier It may be obtained by: carrier is the minimum value among the values ​​(offsetToCarrier) set according to the subcarrier spacing included in the scs-SpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL).

[0406] Fifth embodiment: The terminal determines the offset of the reference resource area indicated by the uplink preemption indicator based on the maximum value of the values ​​(offsetToCarrier) set according to the subcarrier spacing indicated by the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). carrier Value(O carrier,DL ) can be obtained. Specifically, O carrier,DL The value of floor(max_O carrier *S). The value of S can be obtained by max_SCS / SCS ref where max_SCS is the number of carrier That is, it is the subcarrier spacing value corresponding to the maximum value among the values ​​(offsetToCarrier) set by the subcarrier spacing values ​​included in the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). Floor may be replaced by ceil or round. Alternatively, O carrier,DL max_O carrier may be obtained by max_Ocarrier is the maximum value of the value (offsetToCarrier) set by the subcarrier spacing included in the scs-SpecificCarrierList of the FrequencyInforUL-SIB (or FrequencyInforUL).

[0407] Sixth embodiment: The terminal uses offsetToCarrier, which indicates the lowest position among the actual frequency positions indicated by the value (offsetToCarrier) set by the subcarrier value indicated by scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL), to determine the O of the reference resource area indicated by the uplink preemption indicator. carrier Value(O carrier,DL ) can be obtained. Specifically, O carrier,DL The value of floor(min2_O carrier *S), where S is min2_SCS / SCS ref Floor may be replaced by ceiling or round. Alternatively, O carrier,DL The value of min2_O carrier may be obtained by: carrier may be determined based on offsetToCarrier.

[0408] For example, values ​​01, 02, and 03 of offsetToCarrier may be set according to the subcarrier spacing included in scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL). Here, O1 is the value (offsetToCarrier) set according to subcarrier spacing 1, O2 is the value (offsetToCarrier) set according to subcarrier spacing 2, and O3 is the value (offsetToCarrier) set according to subcarrier spacing 3. Among 01, 02, and 03, the value indicating the lowest actual frequency position is min2_O. carrierIn this case, the value indicating the lowest position may be the smallest value among O1*SCS1, O2*SCS2, and O3*SCS3. carrier The subcarrier spacing corresponding to offsetToCarrier can be the value of min2_SCS.

[0409] In the sixth embodiment, the terminal includes offsetToCarrier indicating the lowest position among the actual frequency positions, so that all PRBs may be included in the reference resource region regardless of which UL BWP is configured.

[0410] Seventh embodiment: The terminal uses offsetToCarrier, which indicates the highest position among the actual frequency positions indicated by the value (offsetToCarrier) set by the subcarrier value indicated by scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL), to determine the O of the reference resource area indicated by the uplink preemption indicator. carrier Value(O carrier,DL ) can be obtained. Specifically, O carrier,DL The value of floor(max2_O carrier *S), where S is max2_SCS / SCS ref Floor may be replaced by ceiling or round. Alternatively, O carrier,DL The value of max2_O carrier may be obtained by max2_O carrier may be determined based on offsetToCarrier.

[0411] For example, values ​​01, 02, and 03 of offsetToCarrier may be set according to the subcarrier spacing included in scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL). Here, O1 is the value (offsetToCarrier) set according to subcarrier spacing 1, O2 is the value (offsetToCarrier) set according to subcarrier spacing 2, and O3 is the value (offsetToCarrier) set according to subcarrier spacing 3. Among 01, 02, and 03, the value indicating the highest actual frequency position is max2_O. carrier In this case, the value indicating the highest position may be the largest value among O1*SCS1, O2*SCS2, and O3*SCS3. carrier The subcarrier spacing corresponding to offsetToCarrier can be the value of max2_SCS.

[0412] In a TDD situation, FrequencyInforDL-SIB (or FrequencyInforDL) indicates that the offsetToCarrier value corresponding to the subcarrier of the DL BWP where the uplink preemption indicator is received is O. carrier,DL In other situations, that is, only in FDD situations, the first to seventh embodiments may be used.

[0413] Alternatively, if the offsetToCarrier value for the subcarrier of the DL BWP where the uplink preemption indicator is received is included in the FrequencyInforUL-SIB (or FrequencyInforUL), the offsetToCarrier value for the subcarrier spacing included in the FrequencyInforULSIB (or FrequencyInforUL) is O carrier,DL can have the value

[0414] That is, the offset value of the resource area referenced by the upper layer is O carrier,DLIf the frequency information is transmitted, the terminal can determine the PRB on the frequency axis of the reference resource region based on the value transmitted by the higher layer. Otherwise, if the offsetToCarrier value for the subcarrier spacing of the DL BWP in which the uplink preemption indicator is received is not included in the FrequencyInforUL-SIB (or FrequencyInforUL), the terminal can determine the PRB on the frequency axis of the reference resource region based on the value transmitted by the higher layer. carrier,DL The value of may be calculated.

[0415] FIG. 41 is a flowchart illustrating an example of a terminal operation according to an embodiment of the present invention.

[0416] Referring to FIG. 41, when a DCI including an indicator indicating cancellation of resources scheduled for uplink transmission is received, the terminal can cancel uplink transmission for the resource region indicated by the indicator.

[0417] Specifically, the UE receives configuration information for receiving a physical downlink control channel (PDCCH) (S41010). At this time, the configuration information may include at least one of the above-mentioned 'X' value, 'Y' value, and offset values ​​for determining the symbol position on the time axis and the position of the PRB on the frequency axis in order to identify a reference resource region that is a revocable resource region.

[0418] Furthermore, the configuration information may indicate to the UE in a bitmap manner the position of a symbol on which a PDCCH of DCI is transmitted, including an indicator indicating some or all of the time-frequency resources for uplink transmission cancellation. For example, the value of each bit may be used to indicate to the UE the position of a symbol on which a PDCCH is transmitted.

[0419] Then, the terminal can receive a PDCCH including downlink control information (DCI) based on the configuration information (S41020).

[0420] The DCI may include an indicator indicating some or all of the time-frequency resources for cancellation of uplink transmissions.

[0421] The subcarrier spacing of at least one symbol for which cancellation of uplink transmission is indicated by the indicator included in the DCI may be determined to be the subcarrier spacing of the downlink bandwidth part (DL BWP) of the cell in which the DCI is received.

[0422] In addition, the time-frequency resources for uplink transmission are resources obtained by excluding specific resources from a reference resource region, and the number of symbols in the reference resource region may be determined based on a monitoring period for monitoring the PDCCH or a pre-set value.

[0423] For example, the reference resource region may consist of 'Y' consecutive symbols starting from a starting symbol located 'X' symbols after the last symbol where the PDCCH is detected. The time-frequency resources for uplink transmission are resources obtained by excluding specific resources from the reference resource region, and the number of symbols in the reference resource region may be determined based on a monitoring period for monitoring the PDCCH or a preset value.

[0424] In this case, the resources for the uplink transmission to be canceled are resources that were scheduled for uplink transmission before the PDCCH of the DCI containing an indicator indicating some or all of the time-frequency resources for cancellation of the uplink transmission is detected.

[0425] FIG. 42 is a flowchart illustrating an example of the operation of a base station according to an embodiment of the present invention.

[0426] Referring to FIG. 42, the base station may cancel the configuration of resources scheduled for uplink transmission by transmitting DCI including an indicator instructing cancellation of the uplink transmission.

[0427] Specifically, the base station transmits configuration information for receiving a physical downlink control channel (PDCCH) to the terminal (S42010). At this time, the configuration information may include at least one of the above-mentioned 'X' value, 'Y' value, and offset values ​​for determining the symbol position on the time axis and the position of the PRB on the frequency axis in order to identify a reference resource region that is a revocable resource region.

[0428] Furthermore, the configuration information may indicate to the UE in a bitmap manner the position of a symbol on which a PDCCH of DCI is transmitted, including an indicator indicating some or all of the time-frequency resources for uplink transmission cancellation. For example, the value of each bit may be used to indicate to the UE the position of a symbol on which a PDCCH is transmitted.

[0429] Then, the base station can transmit a PDCCH including downlink control information (DCI) based on the configuration information (S42020).

[0430] The DCI may include an indicator indicating some or all of the time-frequency resources for cancellation of uplink transmissions.

[0431] The subcarrier spacing of at least one symbol for which cancellation of uplink transmission is indicated by the indicator included in the DCI may be determined to be the subcarrier spacing of the downlink bandwidth part (DL BWP) of the cell from which the DCI is transmitted.

[0432] In addition, the time-frequency resources for uplink transmission are resources obtained by excluding specific resources from a reference resource region, and the number of symbols in the reference resource region may be determined based on a monitoring period for monitoring the PDCCH or a pre-set value.

[0433] For example, the reference resource region may consist of 'Y' consecutive symbols starting from a starting symbol located 'X' symbols after the last symbol where the PDCCH is detected. The time-frequency resources for uplink transmission are resources obtained by excluding specific resources from the reference resource region, and the number of symbols in the reference resource region may be determined based on a monitoring period for monitoring the PDCCH or a preset value.

[0434] In this case, the resources for uplink transmission to be canceled are resources scheduled for uplink transmission before the PDCCH of DCI containing an indicator indicating the cancellation of some or all of the time-frequency resources for uplink transmission is detected.

[0435] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed form, and similarly, each component described as distributed may be implemented in a combined form.

[0436] The scope of the present invention is defined by the claims that follow rather than the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention. [Explanation of symbols]

[0437] 100 devices 110 processors 120 Communication Module 121 Cellular communication interface card 122 Cellular communication interface card 123 Unlicensed Spectrum Communication Interface Card 130 memory 140 User Interface 150 display units 200 base stations 210 processor 220 Communication Module 221 Cellular communication interface card 222 Cellular communication interface card 223 Unlicensed Spectrum Communication Interface Card 230 memory

Claims

1. A terminal of a wireless communication system, a communication module; a processor for controlling the communication module; The processor: receiving configuration information for receiving a physical downlink control channel (PDCCH); receiving the PDCCH including downlink control information (DCI) based on the configuration information; the DCI includes an indicator indicating some or all of the time-frequency resources for cancellation of uplink transmission; The subcarrier spacing of at least one symbol for which the uplink transmission cancellation is instructed by the indicator is determined by the UE to be the subcarrier spacing of the downlink bandwidth part (DL BWP) of the cell in which the DCI is received.

2. The time-frequency resource for canceling the uplink transmission is a resource obtained by excluding a specific resource from a reference resource region; The terminal of claim 1 , wherein the number of symbols in the reference resource region is determined based on a monitoring period for monitoring the PDCCH or a preset value.

3. The terminal of claim 2, wherein the specific resource includes one or more symbols of a physical broadcast channel (PBCH) / synchronization signal (SS) symbol and / or a downlink symbol.

4. The terminal according to claim 3 , wherein the downlink symbol is a cell common symbol.

5. The terminal of claim 3, wherein the symbols for the physical broadcast channel (PBCH) / synchronization signal (SS) are symbols commonly configured for a cell.

6. The terminal of claim 2, wherein the start symbol of the reference resource region is a symbol located 'X' symbols after the symbol at which the PDCCH is received.

7. the value of 'X' is determined based on at least one of a first subcarrier spacing and / or a second subcarrier spacing; the first subcarrier spacing is a minimum value among a subcarrier spacing for the PDCCH and a subcarrier spacing for the uplink transmission; The terminal of claim 1 , wherein the second subcarrier spacing is a value determined based on a subcarrier spacing for the uplink transmission.

8. The terminal of claim 1, wherein the time-frequency resource for canceling the uplink transmission is configured with a plurality of regions, each of which is indicated as being canceled by a plurality of bits of the indicator.

9. The time-frequency resource for the cancellation of the uplink transmission is configured of N groups including at least one symbol on a time axis and a plurality of regions divided into at least one physical resource block (PRB) on a frequency axis.

10. the number of the at least one symbol included in at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result; The terminal of claim 9, wherein the number of the at least one symbol included in each of the remaining groups other than the at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result.

11. The configuration information includes a resource indication value indicating an index of a starting PRB of the reference resource region and a number of consecutive RBs; The terminal of claim 9 , wherein the BWP including the at least one PRB indicated by the RIV includes 275 RBs.

12. The terminal of claim 11, wherein a value of an index of the start PRB of the at least one PRB is a value obtained by adding an offset value to a value of the index of the start PRB of the reference resource region.

13. The terminal of claim 12 , wherein the offset value and the subcarrier spacing of the offset value are transmitted by higher layer signaling.

14. The terminal of claim 1, wherein the resources canceled by the indicator are resources for transmitting a physical uplink shared channel (PUSCH) and / or a sounding reference signal (SRS).

15. 2. The terminal of claim 1, wherein a cyclic prefix (CP) of the at least one symbol indicated by the indicator is determined to be a CP of a downlink bandwidth part (DL BWP) of a cell from which the DCI is transmitted.

16. resources are scheduled for uplink transmission; the resources for the uplink transmission are scheduled before the PDCCH is received; The terminal of claim 1 , wherein if the resource and the time-frequency resource indicated by the indicator overlap in some or all symbols, uplink transmission is canceled from the overlapping some or all symbols.

17. 1. A method for receiving downlink control information in a wireless communication system, comprising: Receiving configuration information for receiving a physical downlink control channel (PDCCH); and receiving the PDCCH including downlink control information (DCI) based on the configuration information; the DCI includes an indicator indicating some or all of the time-frequency resources for cancellation of uplink transmission; The subcarrier spacing of at least one symbol for which the uplink transmission cancellation is indicated by the indicator is determined to be the subcarrier spacing of a downlink bandwidth part (DL BWP) of a cell in which the DCI is received.

18. The time-frequency resource for canceling the uplink transmission is a resource obtained by excluding a specific resource from a reference resource region; The method of claim 17 , wherein the number of symbols in the reference resource region is determined based on a monitoring period for monitoring the PDCCH or a pre-set value.

19. The method of claim 18, wherein the specific resource includes one or more symbols of a physical broadcast channel (PBCH) / synchronization signal (SS) and / or downlink symbols.

20. The method of claim 19, wherein the downlink symbols are cell common configured symbols.

21. 20. The method of claim 19, wherein the symbols for the physical broadcast channel (PBCH) / synchronization signal (SS) are cell-wide configured symbols.

22. The method of claim 18, wherein the starting symbol of the reference resource region is a symbol located 'X' symbols after a symbol following the symbol at which the PDCCH is received.

23. the value of 'X' is determined based on at least one of a first subcarrier spacing and / or a second subcarrier spacing; the first subcarrier spacing is a minimum value among a subcarrier spacing for the PDCCH and a subcarrier spacing for the uplink transmission; The method of claim 17 , wherein the second subcarrier spacing is a value determined based on a subcarrier spacing for the uplink transmission.

24. The method of claim 17, wherein the time-frequency resource for canceling the uplink transmission is comprised of a plurality of regions, each of which is indicated as being canceled or not by a plurality of bits of the indicator.

25. 18. The method of claim 17, wherein the time-frequency resource for the cancellation of the uplink transmission is composed of a plurality of regions divided into N groups each including at least one symbol on a time axis and at least one physical resource block (PRB) on a frequency axis.

26. the number of the at least one symbol included in at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result; The method of claim 25, wherein the number of the at least one symbol included in each of the remaining groups other than the at least one group among the N groups is a value obtained by dividing the number of symbols included in the time-frequency resource by N and rounding up the result.

27. The configuration information includes a resource indication value indicating an index of a starting PRB of the reference resource region and a number of consecutive RBs; 26. The method of claim 25, wherein the BWP in which the at least one PRB indicated by the RIV is included includes 275 RBs.

28. The method of claim 27, wherein a value of the index of the starting PRB of the at least one PRB is a value obtained by adding an offset value to a value of the index of the starting PRB of the reference resource region.

29. 29. The method of claim 28, wherein the offset value and the subcarrier spacing of the offset value are transmitted by higher layer signaling.

30. The method of claim 17, wherein the resources revoked by the indicator are resources for transmitting a physical uplink shared channel (PUSCH) and / or a sounding reference signal (SRS).

31. 18. The method of claim 17, wherein a cyclic prefix (CP) of the at least one symbol indicated by the indicator is determined to be a CP of a downlink bandwidth part (DL BWP) of a cell from which the DCI is transmitted.

32. resources are scheduled for uplink transmission; the resources for the uplink transmission are scheduled before the PDCCH is received; The method of claim 17, wherein if the resource and the time-frequency resource indicated by the indicator overlap for some or all symbols, uplink transmission is canceled from the overlapping some or all symbols.

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