Method, apparatus, and system for canceling uplink transmission in a 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. Specifically, the present invention relates to a method for canceling uplink transmission in a wireless communication system and an apparatus using the same.

Background Art

[0002] Since the commercialization of 4G (4th generation) communication systems, efforts have been made to develop a new 5G (5th generation) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is also called a communication system beyond the 4G network, a post-LTE system, or an NR (new radio) system. To achieve a high data transmission rate, the 5G communication system includes a system operated using a millimeter wave (mmWave) band of 6 GHz or higher, and is considered to be implemented in a base station and a terminal including a communication system operated using a frequency band of 6 GHz or lower in terms of ensuring coverage.

[0003] The 3GPP (3rd generation partnership project) NR system improves the spectral efficiency of the network and enables a communication carrier to provide more data and voice services in a given bandwidth. Therefore, the 3GPP NR system is designed to meet the requirements for high-speed data and media transmission in addition to supporting large-capacity voice. The advantages of the NR system can be a high throughput, a low latency, FDD (frequency division duplex) and TDD (time division duplex) support, an improved end-user environment, and a low operating cost due to a simple architecture on the same platform.

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

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

[0006] On the other hand, the Internet is evolving from a human-centered connection network where humans generate and consume information to an IoT (Internet of Things) network that exchanges and processes information between distributed components such as things. IoE (Internet of Everything) technology, which combines big data processing technology using connections to cloud servers and the like with IoT technology, is also emerging. To realize IoT, technical elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, technologies such as sensor networks for connecting things, machine to machine (M2M) communication, and MTC (machine type communication) have been studied. In the IoT environment, intelligent IT (internet technology) services that collect and analyze data generated from connected things and create new value for people's lives can be provided. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through the integration and combination of existing IT (information technology) technologies and various industries.

[0007] Therefore, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, machine to machine (M2M) communication, and machine type communication (MTC) are realized by techniques such as beamforming, MIMO, and array antennas, which are 5G communication technologies. The application of cloud radio access network (cloud RAN) as the aforementioned big data processing technology can also be regarded as an example of the integration of 5G technology and IoT technology. Generally, mobile communication systems have been developed to provide voice services while ensuring the mobility of users.

[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, in the current mobile communication systems that provide services, due to the shortage of resources and the high-speed service requirements of users, a more advanced mobile communication system is desired.

Summary of the Invention

Problems to be Solved by the Invention

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

Means for Solving the Problems

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

[0011] Also, in the present invention, the time-frequency resources for canceling the uplink transmission are resources from which specific resources are excluded 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 preset value.

[0012] Also, in the present invention, the specific resources include one or more symbols among symbols for a physical broadcast channel (PBCH) / synchronization signal (SS) and / or downlink symbols.

[0013] Also, in the present invention, the downlink symbols are symbols configured in a cell common manner.

[0014] Also, in the present invention, the symbol for the physical broadcast channel (PBCH) / synchronization signal (SS) is a cell-common configured symbol.

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

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

[0017] Also, in the present invention, the time-frequency resource for canceling the uplink transmission is composed of a plurality of regions in which it is indicated whether each of a plurality of bits of the indicator cancels or not.

[0018] Also, in the present invention, the time-frequency resource for canceling the uplink transmission is composed of N groups 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] Also, in the present invention, the number of the at least one symbol included in at least one of the N groups is a value obtained by rounding up the value obtained by dividing the number of symbols included in the time-frequency resource by N, 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 rounding up the value obtained by dividing the number of symbols included in the time-frequency resource by N.

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

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

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

[0023] Also, in the present invention, the resource canceled by the indicator is a resource for the transmission of a physical uplink shared channel (PUSCH) and / or a sounding reference signal (SRS).

[0024] Also, 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 in which the DCI is transmitted.

[0025] Also, in the present invention, the resource for the uplink transmission is allocated before the PDCCH including the indicator is received, and the uplink transmission in the resource region overlapping with the at least one symbol of the resource is canceled.

[0026] The present invention also provides a method including 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 canceling uplink transmission, and a subcarrier spacing of at least one symbol indicated by the indicator for canceling the uplink transmission is determined by a subcarrier spacing of a downlink bandwidth part (DL BWP) of a cell in which the DCI is received.

Advantages of the Invention

[0027] According to an embodiment of the present invention, a terminal can receive an indicator for canceling uplink transmission and cancel the uplink transmission according to the indicator. Thereby, the terminal does not perform unnecessary uplink transmission, so that the energy of the terminal can be consumed, and interference to other terminals and a base station can be avoided.

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

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

Figure 31

Figure 32

Figure 33

Figure 34

Figure 35

Figure 36

Figure 37

Figure 38

Figure 39

Figure 40

Figure 41

Figure 42

Best Mode for Carrying Out the Invention

[0030] The terms used in this specification are selected as generally as possible currently widely used terms considering the functions in the present invention, but this may vary depending on the intentions, conventions of those skilled in the art, or the emergence of new technologies. Also, in certain cases, there are those arbitrarily selected by the applicant, and in this case, the meaning is described in the corresponding invention description part. Therefore, it is clarified that the terms used in this specification should be interpreted based not only on the names of the terms but also on the substantial meanings they have and the content throughout this specification.

[0031] Throughout the specification, when it is stated that one component is "connected" to another component, this includes not only the case where they are "directly connected" but also the case where they are "electrically connected" via other intervening components. Also, when it is stated that one component "includes" a specific component, this means that it further includes other components rather than excluding other components, unless otherwise stated to the contrary. In addition, the limiting terms "above" or "below" based on a specific threshold may be appropriately replaced by "more than" or "less than" respectively depending on the embodiments.

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

[0033] Unless otherwise specified in this specification, the base station may include a gNB (next generation node B) defined in 3GPP NR. Also, unless otherwise specified, the terminal may include a UE (user equipment). Hereinafter, for the sake of helping the understanding of the description, each content will be described as an individual embodiment, but the respective embodiments may be used in combination with each other. In the present disclosure, configuring the terminal may mean configuring by the base station. Specifically, the base station can transmit a channel or a signal to the terminal to configure the operation of the terminal or the value of a parameter used in the radio communication system.

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

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

[0036] FIG. 2 is a diagram showing an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 shows the resource grid structure of the 3GPP NR system.

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

[0038] The number of OFDM symbols included in one slot can vary depending on the length of the CP (cyclic prefix). For example, if it is a normal CP, one slot contains 14 OFDM symbols, while if it is an extended CP, one slot contains 12 OFDM symbols. In a specific embodiment, the extended CP is only used with a subcarrier spacing of 60 kHz. In FIG. 2, for the sake of convenience of explanation, the case where one slot consists of 14 OFDM symbols is illustrated, but the embodiments of the present invention are applied in the same manner to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, x*NRBSC subcarriers in the frequency domain. The types of subcarriers are divided into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also referred to as the center frequency (fc).

[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 a tone. Therefore, one RB consists of Nslotsymb*NRBSC resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) within one slot. k is an index given from 0 to Nsize, μgrid, x*NRBSC - 1 in the frequency domain, and l is an index given from 0 to Nslotsymb - 1 in the time domain.

[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 should be aligned with the time / frequency synchronization of the base station. This is because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters necessary to perform the demodulation of the DL signal and the transmission of the UL signal at the correct time.

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

[0042] Information regarding the type of each symbol, that is, information indicating any one of a downlink symbol, an uplink symbol, and a flexible symbol, consists of a cell-specific (or common) RRC signal. Further, information regarding the type of each symbol consists of an additional 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, a symbol not configured with either an uplink symbol or a downlink symbol is a flexible symbol.

[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 a downlink symbol or an uplink symbol that consists of the cell-specific RRC signal to another symbol type. The UE-specific 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 that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0044] The type of symbol configured by the RRC signal as described above can be called a semi-static DL / UL configuration. In the semi-static DL / UL configuration configured by the RRC signal previously, the 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 for explaining a physical channel used in a 3GPP system (e.g., NR) and a general signal transmission method using the physical channel.

[0048] If the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation S101. Specifically, the terminal synchronizes with the base station in the initial cell search. For this purpose, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtains information such as the cell ID. Next, the terminal receives a physical broadcast channel from the base station and obtains broadcast information in the cell.

[0049] The terminal that has completed the initial cell search obtains more detailed system information than the system information obtained through the initial cell search by receiving a physical downlink control channel (PDCCH) and information carried on the PDCCH on a physical downlink shared channel (PDSCH) S102. Here, the system information transmitted to the terminal is cell common system information for the terminal to operate accurately at the physical layer in Radio Resource Control (RRC), and is called remaining system information or System Information Block (SIB) 1.

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

[0051] The RRC layer is used for message generation and management for the control between the terminal and the radio access network (RAN). More specifically, the base station and the terminal can perform broadcasting of cell system information necessary for all terminals in the cell, transmission management of paging messages, mobility management and handover, measurement reporting of the terminal and control related thereto, terminal capability management and custody management in the RRC layer. Generally, since the update of the signal transmitted in the RRC layer (hereinafter, the RRC signal) is longer than the transmission and reception cycle in the physical layer (that is, the transmission time interval, TTI), the RRC setting can be maintained without change in a long cycle.

[0052] After the above-described procedure, the terminal performs PDCCH / PDSCH reception S107 and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) as a general uplink / downlink signal transmission procedure S108. In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. Also, the DCI may have different formats depending on the usage purpose. The uplink control information (UCI) transmitted by the terminal to the base station via the uplink includes downlink / uplink ACK / NACK signals, CQI (channel quality indicator), PMI (precoding matrix index), RI (rank indicator), etc. Here, CQI, PMI, and RI are included in CSI (channel state information). In the case of the 3GPP NR system, the terminal transmits control information such as the above-described HARQ-ACK and CSI via the PUSCH and / or PUCCH.

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

[0054] When the terminal is powered on or attempts to newly access a cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. The terminal detects the physical cell identifier (NcellID) of the cell during the cell search process. For this purpose, the terminal receives synchronization signals, such as a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), from the base station to synchronize with the base station. At this time, the terminal acquires information such as the cell identifier (ID).

[0055] Referring to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into the PSS and the SSS. The PSS is used to obtain time-domain synchronization such as OFDM symbol synchronization and slot synchronization and / or frequency-domain synchronization. The SSS is used to obtain frame synchronization and cell group ID. Referring to FIG. 4(a) and Table 2, the SS / PBCH block consists of 20 RBs (= 240 subcarriers) continuous in the frequency axis and 4 OFDM symbols continuous in the time axis. At this time, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol via the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol where the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, that is, the 0th to 55th and 183rd to 239th subcarriers. Also, in the third OFDM symbol where the SSS is transmitted, the base station does not transmit signals via the 48th to 55th and 183rd to 191st subcarriers. The base station transmits the PBCH (physical broadcast channel) via the remaining REs except the said signals in the SS / PBCH block.

[0056]

Table 2

[0057] The SS has a total of 1008 unique physical layer cell identifiers through combinations of three PSSs and SSSs. Specifically, each physical layer cell ID becomes part of only one physical-layer cell-identifier group, and each group is grouped into 336 physical-layer cell-identifier groups, each containing three unique identifiers. Thus, the physical layer cell ID NcellID = 3N(1)ID + N(2)ID is uniquely defined by the index N(1)ID in the range from 0 to 335 indicating the physical-layer cell-identifier group and the index N(2)ID from 0 to 2 indicating the physical-layer identifier within the physical-layer cell-identifier group. The terminal detects the PSS and identifies one of the three unique physical-layer identifiers. Also, the terminal detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical-layer identifier. At this time, the sequence dPSS(n) of the PSS is as shown in the following [Equation 1].

[0058] [Number]

[0059] Here, it is [Equation 2], and

[0060] [Number]

[0061] is given by [Equation 3].

[0062] [Number]

[0063] Also, the sequence d SSS (n) of the SSS is as follows in the next [Equation 4].

[0064] [Number]

[0065] Here, it is [Equation 5], and

[0066]

Number

[0067] is given by [Equation 6].

[0068]

Number

[0069] A 10-ms long radio frame is divided into two half-frames each 5 ms long. Referring to FIG. 4(b), the slot in each half-frame where the SS / PBCH block is transmitted will be described. The slot where the SS / PBCH block is transmitted is one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0, 1. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1. In case C, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0, 1. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case D, the subcarrier spacing is 120 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n-th symbol. At this time, at carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the subcarrier spacing is 240 kHz, and the start point of the SS / PBCH block is the {8, 12, 16, 20, 32, 36, 40, 44}+56*n-th symbol. At this time, at carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0070] FIG. 5 is a diagram showing procedures for control information and control channel transmission in a 3GPP NR system. Referring to FIG. 5(a), the base station adds a CRC (cyclic redundancy check) masked (e.g., XOR operation) with an RNTI (radio network temporary identifier) to the control information (e.g., DCI) at 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 any one of SI-RNTI (system information RNTI), P-RNTI (paging RNTI), RA-RNTI (random access RNTI), and TPC-RNTI (transmit power control RNTI). Also, the terminal-specific RNTI includes at least any one of C-RNTI (cell temporary RNTI), CS-RNTI, or MCS-C-RNTI. Next, after performing channel encoding (e.g., polar coding) at S204, the base station performs rate-matching at S206 according to the amount of resource(s) used for PDCCH transmission. Next, the base station multiplexes the DCI(s) based on the PDCCH structure on a CCE (control channel element) basis at S208. Also, after applying additional processes S210 such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI(s), the base station maps them to the resources to be transmitted. A CCE is the basic resource unit for a PDCCH, and one CCE consists of a plurality (e.g., 6) of REGs (resource element groups). One REG consists of a plurality (e.g., 12) of REs. The number of CCEs used for one PDCCH is defined as the aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 are used.FIG. 5(b) is a diagram related to the CCE aggregation level and multiplexing of PDCCH, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region thereby.

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

[0072] A CORESET is a time - frequency resource in which a PDCCH, which is a control signal for a terminal, is transmitted. Also, a search space, which will be described later, is mapped to one CORESET. Therefore, instead of monitoring all frequency bands to receive a PDCCH, a terminal monitors a CORESET and a designated time - frequency region to decode the PDCCH mapped to the CORESET. A base station configures one or more CORESETS for each cell for a terminal. A CORESET consists of up to three consecutive symbols on the time axis. Also, a CORESET consists of units of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET #1 consists of consecutive PRBs, and CORESET #2 and CORESET #3 consist of non - consecutive PRBs. A CORESET can be located in 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 showing a method for setting a PDCCH search space in a 3GPP NR system.

[0074] To transmit PDCCH to a terminal, there is at least one or more search spaces in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) where the PDCCH of the terminal is transmitted. The search space includes a common search space that all terminals in a cell belonging to the same base station should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in the cell belonging to the same base station monitor the PDCCH that is set to be commonly searched. Also, the terminal-specific search space is set for each terminal to monitor the PDCCH assigned to each terminal at different search space positions according to the terminal. In the case of the terminal-specific search space, due to the limited control region where the PDCCH is assigned, the search spaces between terminals may be partially overlapped and assigned. Monitoring the PDCCH includes blindly decoding the PDCCH candidates in the search space. When the blind decoding is successful, it is expressed that the PDCCH is (successfully) detected / received, and when the blind decoding fails, it is expressed that the PDCCH is not detected / not received, or not successfully detected / received.

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

[0076] The base station notifies each terminal or terminal group of information regarding resource allocation of the PCH (paging channel) and DL-SCH (downlink-shared channel), which are transmission channels, via the PDCCH (i.e., DL Grant), or information regarding resource allocation and HARQ (hybrid automatic repeat request) of the UL-SCH (i.e., UL Grant). The base station transmits the PCH transmission block and the DL-SCH transmission block via the PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. Also, the terminal receives data excluding specific control information or specific service data via the PDSCH.

[0077] The base station includes in the PDCCH and transmits information regarding to which terminal (one or a plurality of terminals) the data of the PDSCH is to be transmitted and how the terminal should receive and decode the PDSCH data. For example, assume that the DCI transmitted via a specific PDCCH is CRC masked with an RNTI of "A", and that DCI indicates that a PDSCH is allocated to a radio resource (e.g., frequency position) of "B" and indicates transmission format information (e.g., size of the transmission block, modulation method, coding information, etc.) of "C". The terminal monitors the PDCCH using the RNTI information it has. In this case, if there is a terminal that blindly decodes the PDCCH using the "A" RNTI, the terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" via the information of the received PDCCH.

[0078] Table 3 shows an example of the 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: Response to the PDCCH (indicating DL SPS release) and / or response to the uplink transport block (TB) on the PDSCH. HARQ-ACK indicates the reception of information transmitted via the PDCCH or PDSCH. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK, ACK / NACK. Generally, ACK is represented by the bit value 1, and NACK is represented by the bit value 0.

[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 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 for transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted via one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted with two OFDM symbols, the same sequence is transmitted on different RBs for the two symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, the terminal determines the value mcs of the cyclic shift according to the Mbit bits UCI (Mbit = 1 or 2), and maps the sequence obtained by cyclic shifting the base sequence of length 12 with the determined value mcs to the 12 REs of one OFDM symbol and one PRB for transmission. The number of available cyclic shifts for the terminal is 12. If Mbit = 1, 1-bit UCI0 and 1 are indicated by sequences corresponding to two cyclic shifts with a cyclic shift value difference of 6. Also, if Mbit = 2, 2-bit UCI00, 01, 11, 10 are indicated by sequences corresponding to four cyclic shifts with a cyclic shift value difference of 3.

[0086] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via OFDM symbols that are continuous on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, UCI with Mbit = 1 is modulated by BPSK. The terminal modulates UCI with Mbit = 2 by QPSK (quadrature phase shift keying). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. In this case, the sequence can be the base sequence used for PUCCH format 0. The terminal spreads and transmits the obtained signal to the even-numbered OFDM symbols assigned to PUCCH format 1 on the time axis using OCC (orthogonal cover code). The maximum number of different terminals multiplexed on the same RB for PUCCH format 1 can be determined according to the length of the OCC used. On the odd-numbered OFDM symbols of PUCCH format 1, DMRS (demodulation reference signal) is spread and mapped using OCC.

[0087] PUCCH format 2 transmits UCI exceeding 2 bits. PUCCH format 2 is transmitted via one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted using two OFDM symbols, the same sequence is transmitted on different RBs via the two OFDM symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, Mbit-bit UCI (Mbit > 2) is bit-level scrambled, QPSK modulated, and mapped to the RB(s) of one or two OFDM symbol(s). Here, the number of RBs is one of 1 to 16.

[0088] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via OFDM symbols continuous in the time domain and one PRB in the frequency domain. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. Specifically, the terminal modulates Mbit bits of UCI (Mbit>2) with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0)~d(Msymb-1). Here, when using π / 2-BPSK, Msymb = Mbit, and when using QPSK, Msymb = Mbit / 2. The terminal does not apply block-unit spreading to PUCCH format 3. However, the terminal may apply block-unit spreading to one RB (i.e., 12 subcarriers) using a length-12 PreDFT-OCC so that PUCCH format 4 has two or four multiplexing capacities. The terminal transmit precodes (or DFT-precodes) the spread signal, maps it to each RE, and transmits the spread signal.

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

[0090] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via an RRC signal such that it indicates frequency hopping within a slot. When frequency hopping is configured, the indexes of the RBs to perform frequency hopping are obtained from the RRC signal. If the PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor(N / 2) OFDM symbols and the second hop has ceil(N / 2) OFDM symbols.

[0091] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in a plurality of slots. At this time, the number K of slots in which the PUCCH is repeatedly transmitted is configured by the RRC signal. The repeatedly transmitted PUCCH should start from the OFDM symbol at the same position within each slot and have the same length. If any one of the OFDM symbols of the slot in which the terminal should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the terminal does not transmit the PUCCH from that slot and defers the transmission to the next slot.

[0092] On one hand, in the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or equal to the bandwidth of the carrier (or cell). Therefore, the terminal forms a BWP (bandwidth part) consisting of a part of the continuous bandwidth within the carrier bandwidth. A terminal operating according to TDD or operating in an unpaired spectrum can form a maximum of 4 DL / UL BWP pairs for one carrier (or cell). Also, the terminal activates one DL / UL BWP pair. A terminal operating according to FDD or operating in a paired spectrum can form a maximum of 4 DL BWPs for the downlink carrier (or cell) and a maximum of 4 UL BWPs for the uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal may not receive or transmit from time-frequency resources other than the activated BWP. The activated BWP is called the active BWP.

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

[0094] Figure 8 is a conceptual diagram for explaining carrier aggregation.

[0095] Carrier aggregation means that in order for a wireless communication system to use a wider frequency band, a terminal uses a frequency block composed of uplink resources (or component carriers) and / or downlink resources (or component carriers), or a plurality of cells (in the logical sense) to use in one large logical frequency band. For the convenience of explanation below, the term "component carrier" will be used uniformly.

[0096] Referring to FIG. 8, as an example of a 3GPP NR system, the overall system band includes a maximum of 16 component carriers, and each component carrier has a maximum bandwidth of 400 MHz. A component carrier includes one or more physically continuous subcarriers. In FIG. 8, each component carrier is shown to have the same bandwidth, but this is only an example, and each component carrier may have a different bandwidth from each other. Also, each component carrier is shown to be adjacent to each other on the frequency axis, but the drawing shows a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

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

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

[0099] FIG. 9 is a diagram for explaining terminal carrier communication and multi-carrier communication. In particular, FIG. 9(a) shows the subframe structure of a single carrier, and FIG. 9(b) shows the subframe structure of multi-carriers.

[0100] Referring to FIG. 9(a), in a general wireless communication system, data transmission or reception is performed via one DL band and its corresponding one UL band in the case of the FDD mode. In other specific embodiments, in the case of the TDD mode, a radio frame is divided in the time domain into an uplink time unit and a downlink time unit, and data transmission or reception is performed via the uplink / downlink time units. Referring to FIG. 9(b), three 20-MHz component carriers (CCs) are aggregated for UL and DL respectively, supporting a bandwidth of 60 MHz. Each CC may or may not be adjacent to each other in the frequency domain. FIG. 9(b) shows the case where, for the sake of convenience, the bandwidths of the UL CCs and the DL CCs are both the same and symmetric, but the bandwidth of each CC may be determined independently. Also, an asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CCs assigned / configured to a specific terminal via RRC are referred to as the serving DL / UL CCs of the specific terminal.

[0101] The base station communicates with the 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 CCs to be activated / deactivated or change the number of CCs to be activated / deactivated. When the base station assigns the CCs available to the terminal to cell-specific or terminal-specific, unless the CC assignment for the terminal is completely reconfigured or the terminal does not perform a handover, at least one of the CCs once assigned may not be deactivated. One C that is not deactivated for the terminal is referred to as the primary CC (PCC) or the primary cell (PCell), and the CCs that the base station can freely activate / deactivate are referred to as the secondary CCs (SCCs) or the secondary cells (SCells).

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

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

[0104] FIG. 10 is a diagram showing an example to which the cross-carrier scheduling technique is applied. If cross-carrier scheduling is set, the control channel transmitted via the first CC schedules the data channel transmitted via the first CC or the second CC using the carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set, and the DL grant / UL grant transmitted from the PDCCH area of the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, the search area for a plurality of component carriers exists in the PDCCH area of the scheduling cell. The PCell is basically a scheduling cell, and a specific SCell is designated as a scheduling cell by a higher layer.

[0105] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, assume that DL component carrier #0 is the DL PCC (or, PCell), and DL component carriers #1 and #2 are DL SCCs (or, SCell). Also, assume that the DL PCC is set as the PDCCH monitoring CC. Without configuring cross-carrier scheduling by terminal-specific (or terminal-group-specific, or cell-specific) higher-layer signaling, the CIF will be disabled, and each DL CC will only transmit the PDCCH that schedules its own PDSCH without CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the contrary, if cross-carrier scheduling is configured by terminal-specific (or terminal-group-specific, or cell-specific) higher-layer signaling, the CIF will be enabled, and a specific CC (for example, the DL PCC) will transmit not only the PDCCH that schedules the PDSCH of DL CC A using the CIF, but also the PDCCH that schedules the PDSCH of other CCs (cross-carrier scheduling). On the contrary, no PDCCH is transmitted on other DL CCs. Therefore, according to whether cross-carrier scheduling is configured for the terminal or not, the terminal monitors the PDCCH without CIF to receive the self-carrier scheduled PDSCH, or monitors the PDCCH with CIF to receive the cross-carrier scheduled PDSCH.

[0106] On the other hand, FIGS. 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, but the same or similar configuration is also applicable to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

[0107] FIG. 11 is a block diagram showing the configurations of a terminal and a base station according to an embodiment of the present invention. In an embodiment of the present invention, the terminal is implemented as various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal is referred to as a UE, STA (Station), MS (Mobile Subscriber), etc. Also, in an embodiment of the present invention, the base station controls and manages a cell (for example, a macro cell, a femto cell, a pico cell, etc.) corresponding to a service area, and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station is referred to as a gNB (next Generation NodeB) or an AP (Access Point), etc.

[0108] As illustrated, a terminal 100 according to an 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 instructions or programs and processes data inside the terminal 100. Also, the processor 110 controls the overall operation including each unit of the terminal 100 and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 110 may receive slot configuration information, determine the configuration of the slot based on it, 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. For this purpose, the communication module 120 includes a plurality of network interface cards (NICs), such as cellular communication interface cards 121, 122, and unlicensed band communication interface card 123, in a built-in or external form. In the drawings, the communication module 120 is shown as an integrated module, but each network interface card may be arranged independently according to the circuit configuration or application, different from the drawings.

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

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

[0113] The unlicensed band communication interface card 123 transmits and receives radio signals with at least one of the base station 200, external device, and server via a third frequency band which is an unlicensed band, and provides an unlicensed band communication service based on the instructions of the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a band of 2.4 GHz or 52.6 GHz. At least one NIC module of the unlicensed band communication interface card 123 performs cellular communication with at least one of the base station 200, external device, and server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0114] Next, the memory 130 stores the control program used in the terminal 100 and various data thereby. Such a control program includes a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external device, and server.

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

[0116] Next, the display unit 150 outputs various images on the display screen. The display unit 150 outputs various display objects such as the content performed by the processor 110 or the user interface based on the control instructions of the processor 110.

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

[0118] First, the processor 210 executes various instructions or programs and processes data inside the base station 200. Also, the processor 210 controls the overall operation including each unit of the base station 200 and controls the transmission and reception of data between the units. Here, the processor 210 is configured to perform operations according to the embodiments described in the present invention. 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. For this purpose, the communication module 220 includes a plurality of network interface cards such as cellular communication interface cards 221, 222, and unlicensed band communication interface cards 223 in a built-in or external form. In the drawings, the communication module 220 is shown as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application, different from the drawings.

[0120] The cellular communication interface card 221 transmits and receives wireless signals with at least one of the terminal 100, external device, and server described above using a mobile communication network, and provides a cellular communication service in a first frequency band based on an instruction from the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, external device, and server according to the cellular communication standard or protocol of the frequency band less than 6 GHz supported by the NIC module.

[0121] The cellular communication interface card 222 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides a cellular communication service in a 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 utilizes a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the NIC module.

[0122] The unlicensed band communication interface card 223 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a third frequency band that is an unlicensed band, and provides an unlicensed band communication service based on instructions from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that utilizes an unlicensed band. For example, the unlicensed band may be a band of 2.4 GHz or 52.6 GHz. 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, an external device, and a server according to the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0123] The terminal 100 and the base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-described elements of the device are attached to one chip or a plurality of chips according to the design of the device. Also, some configurations of the terminal 100, for example, the user interface unit 150 and the display unit 150, may be selectively provided in the terminal 100. Further, the user interface 140 and the display unit 150, etc., may be additionally provided in the base station 200 if necessary.

[0124] Uplink preemption indicator

[0125] The base station can schedule the time-frequency resources scheduled for the physical uplink data channel transmission of any one terminal for the transmission of other physical uplink channels or the physical uplink channels of other wireless communication terminals. In addition, the base station can schedule the time-frequency resources scheduled for the physical uplink channel transmission of any one terminal for the transmission of other types of physical uplink channels transmitted to the wireless communication terminal. In this way, the preemption of the time-frequency resources scheduled for a specific use to be scheduled for other uses is called preemption. When the time-frequency resources scheduled for the physical uplink channel transmission of any one terminal are preempted for the transmission of the physical uplink channel of other wireless communication terminals, the base station can send an uplink (UL) preemption indicator to the terminal to indicate the preempted time-frequency resources among the time-frequency resources scheduled for the uplink transmission of the terminal. Here, the physical uplink channel can include a physical uplink data channel or a physical uplink control channel.

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

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

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

[0129] Specifically, as shown in FIG. 12, the terminal can detect the PDCCH during monitoring occasions A, B, C, and D for each monitoring periodicity. At this time, the monitoring periodicity may be set by a higher layer (e.g., RRC configuration information).

[0130] If the DCI of the detected PDCCH is a DCI of a specific format (e.g., DCI format 2_4) that includes an uplink preemption indicator for canceling the 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] At this time, the time-frequency resource region that can be canceled by the uplink preemption indicator can be called a reference resource region, and the reference resource region may be composed 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' in the reference resource region may already be set by higher layer signaling (e.g., RRC configuration information), or may be determined based on the monitoring periodicity of the PDCCH. At this time, some resource regions may be excluded from the already set number of symbols or the monitoring periodicity in the reference resource region.

[0133] Specifically, the resource region that can be canceled by the uplink preemption indicator is T on the time axis CIsymbols and B on the frequency axis CI may be composed of PRBs, and T CI symbols may be symbols from which a specific resource region is excluded based on the already set number of symbols or the monitoring period. At this time, the specific resource region may include one or more symbols among the symbols for the physical broadcast channel (PBCH) / synchronization signal (SS) and / or the downlink symbols.

[0134] The reference resource region or T CI symbols may be located after the ‘X’ (T proc,2’ ) symbols after the symbol in which a PDCCH including DCI in a specific format including the uplink preemption indicator is detected. The value of ‘X’ may be determined based on the processing time (T proc,2 ) of the DCI and the offset value (d offset ). That is, the terminal can determine the index of the first symbol of the reference resource region based on the processing time of the DCI and the offset value after the last symbol in which the PDCCH is detected.

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

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

[0137] For example, as shown in FIG. 12, when the number of bits N CI of the uplink preemption indicator is '8', the reference resource region may be divided into 8 groups of b0 to b7 (4 groups on the time axis (G CI ), 2 groups on the frequency axis), and each of the 8 bits may be respectively associated with b0 to b7, and can indicate whether the uplink transmission is cancelled.

[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 flowchart showing an example of a method for cancelling resources allocated for uplink transmission according to an embodiment of the present invention.

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

[0142] Specifically, the terminal (UE) receives RRC configuration information (RRC Configuration Information) including information for receiving downlink control information (Downlink Control Information: DCI) from the base station (Base Station) (S13010).

[0143] For example, the RRC configuration information can include a control resource set (control resource set, CORESET) for the terminal to detect a PDCCH including downlink control information and information related to a search space (e.g., a monitoring period for detecting the PDCCH, etc.). At this time, the information related to the control resource set can include at least one of an identifier (Identifier: ID) of the control resource set for the terminal to detect a PDCCH including DCI, control channel element (control channel element, CCE) configuration information, the length (duration) of the control resource set, or frequency resource information. At this time, the information related to the search space can include at least one of an identifier (Identifier: ID) of the search space for the terminal to detect a PDCCH including DCI, the format of DCI detectable in each search space, the detection interval (duration), or resource information.

[0144] In addition, the RRC configuration information can further include an offset value for determining the start symbol of the reference resource area described in FIG. 12.

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

[0146] At this time, the DCI can include an uplink preemption indicator or a cancellation indicator of an indicator for instructing cancellation of some or all of the resources scheduled for the terminal for uplink transmission.

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

[0148] When the terminal receives the DCI including the uplink preemption indicator, it can cancel the uplink transmission of the resources indicated by the uplink preemption indicator. At this time, the resources to be cancelled may be the resources scheduled by other PDCCHs before the PDCCH transmitting the DCI of the specific format is detected.

[0149] As described with reference to FIG. 12, for the resources cancelled by the uplink preemption indicator, the corresponding resources may have their uplink transmissions cancelled according to the value of each bit.

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

[0151] The base station can be configured to use the RRC signal so that the terminal receives the uplink preemption indicator. The base station can transmit the uplink preemption indicator to the terminal via the PDCCH. When the terminal is configured to receive the uplink preemption indicator using the RRC signal, the terminal can receive the uplink preemption indicator via the PDCCH. The terminal can use the RRC signal to obtain at least one of the search space for the uplink preemption indicator, the monitoring period of the uplink preemption indicator, the value of the RNTI, and the length of the RNTI. The terminal can monitor the uplink preemption indicator according to the obtained monitoring period of the uplink preemption indicator. Also, the terminal can monitor the uplink preemption indicator in the search space for the obtained uplink preemption indicator. Also, the terminal can blindly decode the DCI scrambled by the obtained value and length of the RNTI. When searching for the DCI scrambled by the value of the RNTI obtained by the terminal, the terminal can determine that the DCI is the uplink preemption indicator. The base station can use the RRC signal to configure the same uplink preemption indicator setting for a plurality of terminals. At this time, the PDCCH for transmitting the uplink preemption indicator is a group common PDCCH. The base station can use the RRC signal to configure the uplink preemption indicator for any one terminal. At this time, the PDCCH for transmitting the uplink preemption indicator is a UE-specific PDCCH.

[0152] The time-frequency resource indicating whether the uplink preemption indicator is preempted can include all PRBs of the UL BWP. For the sake of convenience of explanation, the time-frequency resource indicating whether the uplink preemption indicator is preempted is referred to as a reference resource area. Let the monitoring period of the uplink preemption indicator be T INT Then, the reference resource area may be as shown in the following mathematical formula [Formula 7].

[0153]

Number

[0154] At this time, Δ offset indicates the offset of the time-frequency resource. Specifically, the offset of the time-frequency resource may be configured by the RRC signal. In still other specific embodiments, the offset of the time-frequency resource may be a fixed value. Also, the offset of the time-frequency resource may be a multiple of the number of symbols included in the slot. Also, the offset of the time-frequency resource may be determined by the PUSCH processing time of the terminal. Let Tproc be the minimum time required for the terminal to receive the physical downlink control channel that schedules the transmission of the physical uplink link data channel and generate the physical uplink link 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 proportionally to the value of Tproc. For example, the offset of the time-frequency resource may be determined to be ceil(Tproc / Symbol_duration). At this time, Symbol_duration is the duration of the OFDM symbol. Also, ceil(X) represents the smallest integer that is the same as or larger than X. Also, the terminal can determine the offset of the time-frequency resource based on TA (timing advance). Specifically, the terminal can determine the offset of the time-frequency resource based on the time difference between the DL frame boundary and the UL frame boundary due to TA.

[0155] The base station can perform semi-static DL / UL assignment using the cell-specific RRC signal. The semi-static DL / UL assignment can set a symbol to be either an uplink symbol, a downlink symbol, or a flexible symbol. At this time, the uplink symbol is a symbol capable of uplink transmission, and the downlink symbol is a symbol capable of downlink transmission. The flexible symbol is a symbol capable of uplink transmission or downlink transmission according to a signal. The reference resource region may not include the downlink symbol set by the semi-static DL / UL assignment. That is, the reference resource region can include the uplink symbol and the flexible symbol set by the semi-static DL / UL assignment. Also, the reference resource region may not include the flexible symbol located immediately after the downlink symbol. At this time, the number of flexible symbols located immediately after the 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 symbol not included in the reference resource region may be set by the RRC signal.

[0156] The base station can set the reception of the downlink signal using the cell-specific RRC signal. The downlink signal can include the SS / PBCH block. The reference resource region may not include the symbol in which the reception of the downlink signal is set. Also, the reference resource region may not include the symbol located immediately after the symbol in which the reception of the downlink signal is set. At this time, the number of symbols located immediately after the symbol in which the reception of the downlink signal not included in the reference resource region is set may be one. In yet another specific embodiment, the number of symbols located immediately after the symbol in which the reception of the downlink signal not included in the reference resource region is set may be set by the RRC signal.

[0157] The uplink preemption indicator can divide the reference resource region into N parts, and each of the N parts can indicate whether it has been preempted. At this time, N is a natural number. Specifically, the uplink preemption indicator is a bitmap including N bits, and each of the N bits can indicate whether each of the N parts of the reference resource region has been preempted. At this time, N is a natural number. Specifically, the uplink preemption indicator may be a bitmap with a length of 14 bits. At this time, the UL preemption indicator can 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 can 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 each 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, mod(S,N) parts can include ceil(S / N) symbols, and 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 that is the same as or greater than X. floor(X) represents the largest integer that is the same as or less than X. mod(S,N) can be expressed as S - floor(S / N)*N. At this time, the mod(S,N) parts located earlier in time can include ceil(S / N) symbols. Also, in the above-described embodiment, S and N are each natural numbers.

[0159] The terminal can transmit the physical uplink channel using symbols indicating that the uplink pre - emption indicator is not pre - empted, instead of transmitting the physical uplink channel using symbols indicating that the uplink pre - emption indicator is pre - empted. Further, in other specific embodiments, the terminal may sequentially transmit the physical uplink channel using symbols capable of transmitting the physical uplink data channel and discard the remaining physical uplink channels. In the embodiment of FIG. 12, the transmission of the physical uplink data channel is scheduled for 14 symbols from the base station to the terminal. At this time, the uplink pre - emption indicator indicates that the 5th symbol and the 9th symbol are pre - empted. The terminal does not have to transmit the REs of the physical uplink data channel corresponding to the 5th symbol and the 9th symbol, as shown in FIG. 12(a). At this time, the terminal may further transmit the REs of the physical uplink data channel corresponding to the 5th symbol and the 9th symbol in the allocated time - frequency resource. Also, the terminal can sequentially transmit the REs of the physical uplink data channel corresponding to 12 symbols, as shown in FIG. 12(b). At this time, the terminal can further transmit the REs of the physical uplink data channel corresponding to the 13th symbol and the 14th symbol in the allocated time - frequency resource.

[0160] The terminal can transmit a physical uplink link channel that could not be transmitted due to preemption on a time-frequency resource different from the preempted time-frequency resource. At this time, the other time-frequency resource may be a resource different from the resource for the already scheduled physical uplink link channel transmission. For the convenience of explanation, the other time-frequency resource is called 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 compared to the resource for the already scheduled physical uplink link channel transmission. The physical uplink link channel scheduled on 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 symbol closest to the symbol designated as an uplink symbol by semi-static DL / UL allocation starting from after the time-frequency resource on which the physical uplink link data channel scheduled on 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 by semi-static allocation starting from after the time-frequency resource on which the physical uplink link channel scheduled on the preempted time-frequency resource is scheduled. Also, the additional time-frequency resource may be a symbol located N symbols after the physical uplink link channel scheduled on the preempted time-frequency resource. At this time, N is a natural number. N may be set 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 regarding the start symbol of additional time - frequency resources. The terminal can transmit the physical uplink channel that could not be transmitted by preemption starting from the start symbol of the additional resources indicated by the uplink preemption indicator. In the embodiment of FIG. 12, the UL preemption indicator indicates A as the start symbol of the additional time - frequency resources. As shown in FIG. 14(a), the terminal can transmit the REs of the PUSCH corresponding to the 5th symbol and the 9th symbol that could not be transmitted by preemption, starting from the symbol after A from the symbol scheduled for the PUSCH scheduled in the pre - empted time - frequency resources. In FIG. 14(a), B is the length of the RE of the PUSCH corresponding to the 5th symbol. Also, as shown in FIG. 14(b), the terminal can transmit the REs of the PUSCH corresponding to the 13th symbol and the 14th symbol, starting from the symbol after A from the symbol scheduled for the PUSCH scheduled in the pre - empted time - frequency resources. In FIG. 14(b), B is the length of the RE of the PUSCH corresponding to the 13th symbol.

[0162] The uplink preemption indicator can indicate whether it is necessary to transmit the physical uplink channel that does not need to be transmitted by preemption. The terminal can determine whether to transmit the physical uplink channel that does not need to be transmitted by preemption based on the uplink preemption indicator. Specifically, the uplink preemption indicator can use a 1 - bit field to indicate whether it is necessary to transmit the physical uplink channel that does not need to be transmitted by preemption. For example, when the value of the 1 - bit field is 1, the terminal may transmit the physical uplink channel that does not need to be transmitted by preemption in the additional time - frequency resources. Also, when the value of the 1 - bit field is 0, the terminal does not need to transmit the physical uplink channel that does not need to be transmitted by preemption.

[0163] FIG. 15 shows the range of a physical uplink channel that cannot be transmitted by the wireless communication terminal according to the embodiment of the present invention due to preemption.

[0164] When the time - frequency region indicating that the uplink preemption indicator is to be preempted and the time - frequency resource in which the transmission of the terminal's physical uplink channel is scheduled overlap even partially, the terminal does not have to transmit the entire physical uplink channel. In FIG. 15(a), the time - frequency region indicating that the uplink preemption indicator is to be preempted and the time - frequency resource in which the transmission of the terminal's physical uplink channel is scheduled partially overlap. At this time, the terminal does not transmit the entire physical uplink channel.

[0165] When the time - frequency region indicating that the uplink preemption indicator is to be preempted and the time - frequency resource in which the transmission of the terminal's physical uplink channel is scheduled overlap even partially, the terminal does not have to transmit the physical uplink channel only in the symbols that overlap with the time - frequency region indicating that the uplink preemption indicator is to be preempted. In FIG. 15(b), the time - frequency region indicating that the uplink preemption indicator is to be preempted and the time - frequency resource in which the transmission of the terminal's physical uplink channel is scheduled partially overlap. At this time, the terminal does not transmit the physical uplink channel in the symbols that overlap with the time - frequency region indicating that the uplink preemption indicator is to be preempted.

[0166] When the time-frequency region indicating that the uplink preemption indicator is to be preempted overlaps even partially with the time-frequency resource in which the transmission of the terminal's physical uplink channel 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 from the symbol corresponding to the time-frequency region indicating that the uplink preemption indicator is to be preempted. In Fig. 15(c), the time-frequency region indicating that the uplink preemption indicator is to be preempted and the time-frequency resource in which the transmission of the terminal's physical uplink channel is scheduled partially overlap. At this time, the terminal does not transmit the physical uplink channel from the symbols in the time-frequency region indicating that the uplink preemption indicator is to be preempted.

[0167] The physical uplink channel can include DMRS for channel estimation. When 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 in consideration of the presence or absence of DMRS transmission. This will be described with reference to Fig. 16.

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

[0169] As described above, the uplink preemption indicator can include information about additional time-frequency resources. The terminal can transmit the physical uplink channel in the additional time-frequency resources based on the information about the additional time-frequency resources. At this time, the terminal can transmit the physical uplink channel that could not be transmitted due to preemption. In still other specific embodiments, the terminal can transmit the entire physical uplink channel that could not be transmitted even partially due to preemption.

[0170] At this time, the information regarding the additional time-frequency resource may be expressed in terms of the number of symbols or the number of slots. Specifically, the information regarding the additional time-frequency resource can indicate how many symbols later the additional time-frequency resource is located from the last symbol of the time-frequency resource where preemption is performed or the last symbol of the reference resource area. Alternatively, the information regarding the additional time-frequency resource can indicate how many slots later the additional time-frequency resource is located from the last symbol of the time-frequency resource where preemption is performed or the last symbol of the reference resource area. The symbol where the additional time-frequency resource is located may be the first symbol after the time-frequency resource where preemption is performed among the symbols designated as uplink symbols by the semi-static DL / UL allocation. Also, the symbol where the additional time-frequency resource is located may be the symbol indicated by the DCI that schedules the transmission of the physical uplink channel.

[0171] The terminal can determine the form of the physical uplink channel transmitted in the additional time-frequency resource according to whether the DMRS of the physical uplink channel can be transmitted by preemption or not. Specifically, when the terminal cannot transmit the DMRS by preemption, the terminal can re-transmit the entire physical uplink channel that could not be transmitted even partially by preemption in the additional time-frequency resource. Also, when the terminal transmits the DMRS despite the occurrence of preemption, the terminal can transmit a part of the physical uplink channel that could not be transmitted by preemption in the additional time-frequency resource. When the physical uplink channel that could not be transmitted by preemption does not include the DMRS, the terminal can transmit both a part of the physical uplink channel that could not be transmitted by preemption and the DMRS in the additional time-frequency resource.

[0172] In the embodiment of FIG. 16, the terminal determines the time-frequency resources where preemption has occurred based on the uplink preemption indicator. The terminal cannot transmit the physical uplink channel due to preemption. In FIG. 16(a), the terminal also cannot transmit the DMRS of the physical uplink channel due to preemption. Therefore, the terminal transmits the entire physical uplink channel using the additional time-frequency resources indicated by the uplink preemption indicator. In FIG. 16(b), the terminal cannot transmit a part of the physical uplink channel due to preemption, but transmits the DMRS of the physical uplink channel. Therefore, the terminal can transmit the part of the physical uplink channel that does not need to be transmitted due to preemption using the additional time-frequency resources. At this time, the terminal transmits both a part of the physical uplink channel and the DMRS.

[0173] FIG. 17 shows the range of the physical uplink channel that cannot be transmitted by the wireless communication terminal according to still another embodiment of the present invention due to preemption.

[0174] The physical uplink data channel can include DMRS for channel estimation. Also, the physical uplink data channel can include uplink control information (UCI). At this time, the UCI may be transmitted in the REs around the DMRS symbol. When preemption does not affect the transmission of DMRS and UCI, the terminal can transmit the physical uplink data channel in the symbol where DMRS and UCI are transmitted. At this time, as shown in Fig. 17(a), the terminal does not have to transmit the physical uplink data channel at the time-frequency where the uplink preemption indicator is indicated to be preempted. In yet another specific embodiment, as shown in Fig. 17(b), the terminal does not have to transmit the physical uplink data channel in symbols other than the symbol where DMRS and UCI are transmitted. When preemption affects the transmission of DMRS and UCI, the terminal does not have to transmit the entire physical uplink data channel as shown in Fig. 17(c). When preemption affects the transmission of DMRS and UCI, the uplink preemption indicator may be the case where the time-frequency region indicating that preemption has occurred overlaps with the physical uplink channel where the transmission of DMRS or the transmission of UCI is scheduled.

[0175] Fig. 18 shows the operation of a terminal according to an embodiment of the present invention to transmit DMRS and UCI that could not be transmitted due to preemption.

[0176] The terminal can determine the form of the physical uplink shared channel (PUSCH) transmitted on additional time-frequency resources based on the information included in the physical uplink shared channel. Specifically, the terminal can determine the form of the PUSCH transmitted on additional time-frequency resources according to whether preemption affects the transmission of uplink control information (UCI) included in the PUSCH. When preemption affects the transmission of UCI included in the PUSCH, it may be the case that at least a part of the resource elements (REs) scheduled for UCI transmission cannot be transmitted due to preemption. When preemption does not affect the transmission of UCI included in the PUSCH, the terminal does not necessarily need to transmit only the PUSCH scheduled on the time-frequency resources indicated by the uplink preemption indicator. At this time, the terminal does not necessarily need to transmit the PUSCH that could not be transmitted due to preemption on additional time-frequency resources. When preemption affects the transmission of UCI included in the PUSCH, the terminal does not necessarily need to transmit the entire PUSCH or the PUSCH indicated by the uplink preemption indicator. At this time, the terminal can transmit the entire PUSCH or the PUSCH indicated by the uplink preemption indicator on additional time-frequency resources. At this time, the terminal can transmit a PUSCH that includes only UCI on additional time-frequency resources. Specifically, the terminal can transmit the PUSCH excluding the symbols on which only the uplink shared channel (UL-SCH) is mapped in the PUSCH. In yet another specific embodiment, the terminal can transmit the PUSCH excluding the REs on which the UL-SCH is mapped in the PUSCH.In yet another specific embodiment, the terminal can transmit a physical uplink shared channel (PUSCH) that includes all of the UL-SCH and UCI in additional time-frequency resources. 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 resource elements (REs) scheduled for DMRS and UCI transmission are preempted. Therefore, the terminal does not transmit the entire PUSCH or the PUSCH indicated by the uplink preemption indicator. The terminal transmits a PUSCH that includes only DMRS and UCI in the additional time-frequency resources indicated by the uplink preemption indicator.

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

[0178] When a terminal whose physical uplink link channel is pre-empted from a UL pre-emption indication transmits the pre-empted physical uplink link channel in additional time-frequency resources, the terminal may receive other uplink pre-emption indicators. Thus, when pre-emption occurs in additional time-frequency resources, the terminal does not have to transmit the physical uplink link channel in the additional time-frequency resources. At this time, the terminal can transmit the physical uplink link channel that could not be transmitted due to pre-emption in a new additional time-frequency resource based on the uplink pre-emption indicator that indicated pre-emption in the additional time-frequency resources. Specifically, when the uplink pre-emption indicator that indicated pre-emption in the additional time-frequency resources indicates a new additional time-frequency resource, the terminal can transmit the physical uplink link channel that could not be transmitted due to pre-emption in the new additional time-frequency resource. Further, in other specific embodiments, even if the uplink pre-emption indicator that indicated pre-emption in the additional time-frequency resources indicates a new additional time-frequency resource, the terminal does not have to transmit the physical uplink link channel that could not be transmitted due to pre-emption in the new additional time-frequency resource.

[0179] When the physical uplink control channel is pre-empted, the terminal can determine whether to transmit the physical uplink control channel according to the information included in the physical uplink control channel in additional time-frequency resources. Specifically, when the physical uplink control channel includes HARQ-ACK and the pre-emption affects the transmission of the physical uplink control channel, the terminal does not have to transmit in the time-frequency resources where the transmission of the physical uplink control channel is scheduled. At this time, the terminal can transmit the physical uplink control channel that could not be transmitted due to pre-emption in the additional time-frequency resources.

[0180] The resource region for which the resource scheduled for uplink transmission may be cancelled by the uplink preemption indicator will be described below.

[0181] Reference resource region for UL preemption indication

[0182] In the present invention, the resource region in which the uplink transmission is cancelled by the uplink preemption indicator is referred to as the reference resource region. However, this is for convenience of explanation and is not limited thereto.

[0183] The terminal can detect, using blind detection, in the search space of the CORESET, a PDCCH of DCI including an uplink preemption indicator that instructs cancellation of the resource already scheduled for uplink transmission. At this time, the PDCCH of DCI including the uplink preemption indicator may be a group common PDCCH scrambled with a specific RNTI (for example, UL-INT-RNTI, etc.).

[0184] For example, the terminal may have a resource for uplink transmission scheduled by the base station in the DCI of the PDCCH. Thereafter, the base station can transmit a PDCCH of DCI including an uplink preemption indicator for cancelling the resource scheduled for uplink transmission by the terminal, and the PDCCH of DCI including the uplink preemption indicator may be scrambled with the UL-INT-RNTI set by the upper layer to indicate the DCI for cancelling the scheduled resource.

[0185] When the terminal successfully receives the uplink preemption indicator (i.e., when the group common DCI scrambled with a specific RNTI is detected), it can identify the reference resource region indicated by the uplink preemption indicator. Then, based on the information indicated by the uplink preemption indicator, the terminal can identify the time-frequency resources in which uplink transmission is cancelled in the reference resource region, and cancel the 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 the active bandwidth part (BWP).

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

[0187] In the first embodiment of the present invention, Fig. 19 shows 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 only by the interval between the symbols in which the uplink preemption indicator is received, and may be indicated from the symbol after a specific symbol from the last symbol in which the uplink preemption indicator is received.

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

[0190] That is, the reference resource region to which the uplink preemption indicator can be applied may be the resource region indicated by the upper layer or the region obtained by excluding specific symbols from the period for monitoring the PDCCH.

[0191] In this case, since it is determined so that the reference resource regions indicated by the respective uplink preemption indicators do not overlap, the reference resource region can be indicated with the highest precision using the same bits. However, in the embodiment described with reference to FIG. 19, when any one of a plurality of uplink preemption indicators cannot be received because it is not detected by the terminal (when reception fails), the uplink transmission in the resource region indicated by the uplink preemption indicator that has failed in reception cannot be cancelled. Also, when the pause without resume method is applied in which if even one symbol of the uplink channel is cancelled, the remaining subsequent symbols are cancelled, if the terminal cannot receive even one of the plurality of uplink preemption indicators, the uplink transmission in the reference resource indicated by the uplink preemption indicator that has failed in reception and the subsequent uplink transmissions cannot be cancelled.

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

[0193] At this time, when the plurality of symbols is for the search space set of the PDCCH for a specific format of DCI and the monitoring period of the PDCCH is one slot, and there is a monitoring occasion for monitoring one or more PDCCHs in one slot, it may be indicated by a higher layer (for example, MIB or SIB). Otherwise, the plurality of symbols may be the same as the monitoring period for monitoring the PDCCH.

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

[0195] The second embodiment of the present invention, FIG. 20 shows still another example of the resource indicated by the preemption according to the embodiment of the present invention.

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

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

[0198] At this time, 'Y' may be a preset value. For example, the value of 'Y' may preferably be the number of symbols included in one slot (that is, 14 in normal CP and 12 in extended CP). Or, the value of 'Y' may be determined as the larger value among the preset value or the monitoring period for monitoring the PDCCH.

[0199] For example, when the already set 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. Or, when the already set 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] FIG. 20 shows a case where there are 9 monitoring opportunities for monitoring the PDCCH of DCI including the uplink preemption indicator in the downlink cell. In FIG. 20, the reference resource regions that can be indicated by the uplink preemption indicator in each of the plurality of monitoring opportunities may be determined such that part or all of each of them overlaps with part or all of the previous and / or subsequent reference resource regions. Therefore, even when the terminal receives one uplink preemption indicator, it can obtain information for canceling uplink transmission for a wide time region.

[0201] Also, even when reception of some of the plurality of uplink preemption indicators fails, the terminal can obtain information for canceling uplink transmission based on the uplink preemption indicators received in other monitoring opportunities.

[0202] For example, as shown in FIG. 40, there are nine monitoring opportunities for receiving a PDCCH of a DCI including an uplink preemption indicator for canceling resources scheduled for uplink transmission, and the reference resource regions indicated by the uplink preemption indicators may overlap with each other. That is, 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 DCIs 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 without receiving the second uplink preemption.

[0204] A third embodiment of the present invention, FIG. 21 shows still another example of resources indicated by preemption according to an embodiment of the present invention.

[0205] Referring to FIG. 21, the reference resource region that may be indicated by the uplink preemption indicator may be determined as a plurality of symbols from a symbol after a specific symbol from the last symbol in which the uplink preemption indicator is received. At this time, the plurality of determined symbols may be limited to the symbols included in the slot including the first symbol of the reference resource region indicated by the uplink preemption indicator.

[0206] That is, different from FIGS. 19 and 20, in the third embodiment of FIG. 21, symbols of a reference resource region that can be indicated by an uplink preemption indicator are not determined across slot boundaries. In other words, an uplink channel of a terminal that monitors a PDCCH of a DCI including an uplink preemption indicator is scheduled within one slot. Therefore, information for canceling uplink transmission in the next slot is unnecessary, and thus, the number of symbols that can be indicated by the uplink preemption indicator may be limited within one slot. In this case, since the number of symbols included in the reference resource region can be reduced, more precisely, a region where uplink transmission is canceled can be indicated.

[0207] A fourth embodiment of the present invention, FIG. 22 shows yet another example of a resource indicated by preemption according to an embodiment of the present invention.

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

[0209] An uplink channel of a terminal that monitors an uplink preemption indicator is scheduled within one slot, and when uplink transmission of a previous symbol in the slot is canceled, subsequent symbols may all be canceled (pause without resume). Therefore, it is important to indicate whether a symbol located earlier in the slot is canceled.

[0210] As shown in Fig. 22, in the fourth embodiment, even if the terminal receives one uplink preamble indicator out of four uplink preamble indicators that indicate cancellation of uplink transmission of symbols within the same slot, it can know information regarding preamble within the slot.

[0211] The fifth embodiment of the present invention, Fig. 23 shows yet another example of resources indicated by preamble according to an embodiment of the present invention.

[0212] Referring to Fig. 23, the reference resource area that can be indicated by the uplink preamble indicator may include the previous 'Y' symbols from the symbol 'X' symbols after the last symbol of the monitoring opportunity after the uplink preamble indicator is received.

[0213] For example, as shown in Fig. 23, the reference resource area indicated by the uplink preamble indicator received in the first monitoring opportunity may be determined as the previous 'Y' symbols from the symbol 'X' symbols after the last symbol of the second monitoring opportunity.

[0214] At this time, the value of 'Y' may be the same as the already 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 normal CP and 12 for extended CP). Or, the value of 'Y' may be determined as the maximum value among the already set value or the monitoring period. That is, when the predefined value is 14 and the monitoring period is 2 symbols, the value of 'Y' may be determined as 14. Or, when the predefined value is 14 and the monitoring period is 28 symbols (2 slots), the value of 'Y' may be determined as 28.

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

[0216] The sixth embodiment of the present invention, FIG. 24 shows still another example of the resource indicated by the preemption according to the embodiment of the present invention.

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

[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 the uplink transmission. That is, since the terminal requires processing time for decoding the PDCCH detected in the monitoring opportunity of the monitoring period, the uplink transmission for the symbols located after a certain number of symbols after the uplink preemption indicator is received can be canceled. Therefore, the terminal can cancel the uplink transmission at the scheduled symbol only when the uplink preemption indicator is received at a symbol a certain number of symbols before the symbol for which the cancellation of the uplink transmission is scheduled. Therefore, the value of 'X' may correspond to the minimum number of symbols considering the processing time.

[0219] When the uplink transmission is scheduled by the PDCCH transmitted from the base station, the terminal can determine the monitoring opportunity to be monitored based on the reference resource area set by the upper layer. That is, if the resource scheduled for uplink transmission and the reference resource area overlap even by one symbol, the terminal must detect the PDCCH in the monitoring opportunity related to the reference resource area and blindly decode the uplink preemption indicator included in the DCI. That is, when the reference resource area indicated by the upper layer and the resource area scheduled for uplink transmission overlap, the terminal must determine the resource area where the uplink transmission is cancelled, and thus, must detect the PDCCH in the monitoring opportunity that can indicate the resource area cancelled in the reference resource area.

[0220] Conversely, if the resource scheduled for uplink transmission and the reference resource area set by the upper layer do not overlap, there is no need to blindly decode the uplink preemption indicator for cancelling the uplink transmission in the reference resource area.

[0221] At this time, the uplink preemption indicator by the DCI of a specific format is applied, and the uplink transmission that may be cancelled may be PUSCH transmission, SCS transmission, PRACH transmission, or the like.

[0222] For the terminal, an 'X' value and a 'Y' value for determining the position on the time axis of the reference resource region may be set by the base station. At this time, the value of 'X' 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 set as 'Y' consecutive symbols starting from the symbol after the X-th symbol from the last symbol of the PDCCH based on the 'X' and 'Y' values set by the upper layer. In this case, in order to apply the 'X' and 'Y' values set by the RRC configuration information for the downlink to the symbols for the uplink transmission, it is necessary to determine the subcarrier spacing and the CP type of the symbols to which the 'X' and 'Y' values are applied.

[0223] That is, since the subcarrier spacing and the CP type for the symbols on the time axis may be different between the downlink and the uplink and / or between each cell and BWP for the uplink, when applying a specific number of symbols set for the downlink to the uplink, it is necessary to determine the subcarrier spacing and the CP type for the specific number of symbols.

[0224] Hereinafter, a method for determining a numerology (for example, subcarrier spacing and cyclic prefix (CP) type) for defining 'X' and 'Y' symbols for determining the reference resource region will be described.

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

[0226] The terminal can determine the 'X' symbols and the 'Y' symbols based on the subcarrier spacing and the CP type set by the RRC configuration information. At this time, the subcarrier spacing and the CP type may be set for each cell. In this case, when the uplink bandwidth parts (UL BWPs) have different subcarrier spacings and CP types respectively, the terminal must interpret the subcarrier spacing and the CP type for the 'X' symbols and the 'Y' symbols accordingly. As another method, the subcarrier spacing and the CP type may be set for each UL BWP.

[0227] As a second embodiment, when the 'X' symbols and the 'Y' symbols are set by the RRC configuration information of the upper layer, the terminal can interpret that the subcarrier spacing and the CP type for the 'X' symbols and the 'Y' symbols are the subcarrier spacing and the 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, for the 'X' and 'Y' symbols for indicating the reference resource area where the uplink transmission is cancelled by the uplink preemption indicator, the subcarrier spacing and the CP type of the DL BWP where the uplink preemption indicator is received may be applied and interpreted.

[0229] For example, when 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, the subcarrier spacing of the symbols for the uplink transmission canceled by the uplink preemption indicator is 30 kHz. Even when 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 spacing) for the canceled uplink transmission to be the symbol interval of the activated downlink BWP for monitoring the PDCCH for a specific format including the uplink preemption indicator.

[0231] As a third embodiment, the subcarrier spacing and CP type for the symbols of 'X' and 'Y' may be determined based on the subcarrier spacing and CP type of the UL BWP that is a pair with the DL BWP of the cell in which the uplink preemption indicator is transmitted. At this time, 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 the symbols of 'X' and 'Y' 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 the symbols of 'X' and 'Y' may be determined based on the minimum subcarrier spacing or the maximum subcarrier spacing among the subcarrier spacings of the uplink cells and the CP type corresponding thereto.

[0234] In this way, the subcarrier spacing and CP type for the 'X' and 'Y' values set by the higher layer signal may be determined.

[0235] The reference resource region is a set of uplink resources that can be canceled by the uplink preemption indicator. 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 that transmits the uplink preemption indicator is different from the subcarrier spacing of the PUSCH or SRS transmission that is an uplink transmission, the symbols included in the reference resource region may be determined in the following manner.

[0236] First, the receiving period and offset of the PDCCH that transmits the uplink preemption indicator from the base station to the terminal may be set. The receiving period and offset may be set in units of slots. That is, it may be set to receive the uplink preemption indicator every several slots. Further, the base station may also indicate to the terminal the symbol in which the PDCCH that transmits the uplink preemption indicator within the slot is received. For example, using a bitmap composed of 14 bits, the base station can indicate to the terminal the symbol for receiving the PDCCH in which the UL CI is transmitted. Each bit of the bitmap corresponds to 14 symbols respectively. If the 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] The symbols starting from 'X' (or T proc,2 ) symbols after the symbol where the PDCCH that transmits the uplink preemption indicator ends may be determined as the reference resource region corresponding to the uplink preemption indicator. T proc,2is a value corresponding to the minimum time for PUSCH transmission. When the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is different from the subcarrier spacing of PUSCH or SRS transmission, the number 'Y' of symbols included in the reference resource region may be determined by the following method.

[0239] A first embodiment of the present invention, FIG. 25 shows 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 , and the subcarrier spacing for uplink transmission is μ UL .).

[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 for the terminal and may have at least one value among 2, 4, 7, and 14. Also, S CI may be determined as the number of uplink symbols included in the period for monitoring the PDCCH that transmits the uplink preemption indicator. That is, S CI = P CI * N symb and can be expressed as. Here, P CI is the reception period per slot of the PDCCH that transmits the uplink preemption indicator. N symbis the number of symbols included in the slot in which PUSCH or SRS for uplink transmission is transmitted. For example, the number of symbols included in the slot in which PUSCH or SRS is transmitted is 14 when normal CP (normal CP) is set, and 12 when Extended CP (Extended CP) is set.

[0243] In FIG. 25, 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 30 kHz (μ UL =1). That is, approximately two uplink symbols may be included in one uplink symbol, and S CI is 14. In FIG. 25, Y is 7. That is, seven symbols may be included in the reference resource region.

[0244] This is the second embodiment of the present invention. FIG. 26 shows still another example of a method for determining the number of symbols included in the resource indicated by preemption according to the 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 may be 60 kHz (μ UL =2). That is, approximately four uplink symbols may be included in one uplink symbol. And S 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, 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.

[0247] Y = ceil(2 ^ (μ DL - μ UL ) * SCI )

[0248] That is, it includes the entire symbol partially included in the uplink reference resource. Therefore, four symbols may be included instead of 3.5 symbols.

[0249] In FIG. 26, the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 15 kHz (μ DL = 0), and the subcarrier spacing of the 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 have overlapping symbols. However, the uplink reference resources corresponding to the second and third uplink preemption indicators have one overlapping symbol. Thus, further interpretation regarding the overlapping symbols is required.

[0250] A third embodiment of the present invention, FIG. 27 shows still 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, 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.

[0252] Y = floor(2^(μ DL - μ UL ) * S CI )

[0253] According to the above mathematical formula, the symbols partially included in the uplink reference resource may be excluded. Therefore, three symbols may be included in the reference resource area instead of 3.5 symbols.

[0254] In FIG. 27, the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 15 kHz (μ DL=0), and the subcarrier spacing of 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 with each other. 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 cancelled (or interrupted) in the said symbol.

[0255] A fourth embodiment of the present invention, FIG. 28 shows still 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, 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 in the same manner as in the second embodiment of FIG. 26.

[0257] However, different from the second embodiment, the symbols included in the reference resource area of the previous uplink preemption indicator are not included in the subsequent reference resource area. That is, the symbols partially included in the reference resource area 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 area including 3 symbols and a reference resource area including 4 symbols instead of 3.5 symbols.

[0258] In FIG. 28, the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 15 kHz (μ DL =0), and the subcarrier spacing of PUSCH or SRS transmission which is uplink transmission is 60 kHz (μ UL= 2). The uplink reference resources corresponding to the second and third uplink preemption indicators can 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 with each other.

[0259] As still another example of the present invention, the terminal does not need to expect a higher layer setting where 2^(μ DL -μ UL )*S CI is not a natural number. Here, the setting by the higher layer can include at least one of the subcarrier spacing (μ DL ) of the PDCCH on which the uplink preemption indicator is transmitted, the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is an uplink transmission, the number of symbols per slot (N symb ) determined by the normal CP or extended CP, information regarding the period and offset of the PDCCH that transmits the uplink preemption indicator, or the S CI value.

[0260] Downlink symbols may be excluded from the reference resource area for canceling uplink transmission. At this time, the downlink symbols may be the symbols designated as downlink symbols by the semi-static DL / UL configuration. Also, symbols for receiving the SS / PBCH block may be further excluded from the reference resource area.

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

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

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

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

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

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

[0267] If there are two or more uplink symbols overlapping with the last symbol in which PDDCH is received in the UL cell, either the first (initial) symbol may be determined as the last symbol in which PDCCH is received, or the last symbol may be determined as the last symbol in which PDCCH is received.

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

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

[0270] - The payload size for the DCI of a specific format

[0271] - The indicator for the time - frequency resource by upper layer signaling.

[0272] Among the above additional information, the information regarding the 'X' value, 'Y' value, and numerology for 'X' and 'Y' symbols can be obtained in the following manner.

[0273] First, for each cell, a 'X' value, a 'Y' value, and numerologies for 'X' and 'Y' symbols may be set. The terminal can apply the set 'X' value, 'Y' value, and numerologies for 'X' and 'Y' symbols to each respective cell. If multiple UL BWPs are set for each cell, the numerologies for the 'X' value, 'Y' value, 'X' and 'Y' symbols may be interpreted individually by the UL BWP.

[0274] Second, for one 'X' value, 'Y' value, and numerologies for 'X' and 'Y' symbols, they may be set by the base station. Then, the terminal can interpret each UL BWP according to the set numerologies for one 'X' value, 'Y' value, 'X' and 'Y' symbols. For example, the terminal can determine the symbols included in the reference resource region according to the numerologies for the 'X' value, 'Y' value, and 'X' and 'Y' symbols in the first UL cell, and can determine the symbols of other UL cells overlapping with the reference resource region as the reference resource regions of the other UL cells. If the overlapping region is only a part rather than the whole of the symbols, the said symbols may or may not be included in the reference resource region. To prevent the situation where 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 to occur when only some symbols of 30 kHz and 60 kHz UL cells are included.

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

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

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

[0279] In this case, since the subcarrier spacings of the first UL cell and the second UL cell may be different, although the 'X' and 'Y' values of the first UL cell and the second UL cell are the same, the absolute time may be different.

[0280] Hereinafter, a specific description will be given with reference to FIGS. 29 to 31.

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

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

[0283] FIG. 30 shows still another example of a method for determining a resource indicated by a preemption according to an embodiment of the present invention. Referring to FIG. 26, the terminal may have the 'X' value and 'Y' value of the cell set by the base station. In this case, the terminal determines that the start symbol of the reference resource region is located after 'X' symbols from the last symbol in which the uplink preemption indicator is received by detecting the PDCCH in the DL cell, and 'Y' symbols from the start symbol are included in the reference resource region.

[0284] Here, the subcarrier spacing and CP type set for the DL cell may be applied to 'X' and 'Y' symbols. And the reference resource region of the UL cell may include symbols overlapping the reference resource region determined in the DL cell. In this case, as described above, among the symbols of the reference resource region, only some of the overlapping symbols may or may not be included in the reference resource region.

[0285] FIG. 31 shows yet another example of a method for determining a resource indicated by preemption according to an embodiment of the present invention. Referring to FIG. 27, the terminal may have the 'X' value, 'Y' value, subcarrier spacing, and CP type for 'X' and 'Y' symbols set by the base station for the cell. Referring to FIG. 27, UL cell #0 represents the cell to which the set subcarrier spacing and CP type are applied. The terminal can determine the last symbol among the uplink symbols that overlap with the last symbol in which the uplink preemption indicator was received. Then, after 'X' symbols from the determined last symbol, the first symbol constituting the reference resource region is located, and it can be determined that 'Y' symbols from the first symbol are included in the reference resource region. At this time, the subcarrier spacing and CP type for 'X' and 'Y' symbols are the subcarrier spacing and CP type set to be the same as those of UL cell #0.

[0286] The terminal that determines the reference resource region in UL cell #0 based on the 'X' and 'Y' values can determine the reference resource region of UL cell #1 where the uplink transmission is actually cancelled by the uplink preemption indicator based on UL cell #0. Specifically, the terminal can determine the region that overlaps with the reference resource region of UL cell #0 in UL cell #1 as the reference resource region where the uplink transmission is actually cancelled.

[0287] In the previous embodiments, it was explained that both the 'X' and 'Y' values may be set by RRC or DCI. However, 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. At this time, the subcarrier spacing may be the subcarrier spacing of the UL cell or the subcarrier spacing set by RRC.

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

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

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

[0292] Therefore, the reference resource region may be divided into a plurality of regions (or groups) on the time axis and the frequency axis. Specifically, the reference resource region may be divided into T including G CI symbols on the time axis, and may be divided into K including at least one PRB on the frequency axis.

[0293] At this time, T*K, which is the total number of the plurality of divided regions, may be the same as the number of bits of the uplink preemption indicator. For example, when the reference resource region is divided into T on the time axis, on the frequency axis, it may be divided in consideration of the number of bits of the uplink preemption indicator. That is, when the number of bits of the uplink preemption indicator is 8 and the reference resource region is divided into 4 regions on the time axis, it may be divided into 2 regions on the frequency axis. At this time, each of the divided regions 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 terminal by RRC configuration information or the like. Each resource region divided from the reference resource region may be indicated whether the uplink transmission is canceled by each bit (1 bit) of the uplink preemption indicator.

[0294] When the reference resource region is divided into a plurality of regions, the reference resource regions indicated by the uplink preemption indicators transmitted by different PDCCHs may partially or entirely overlap each other as shown in FIG. 28. In this case, when 2 or more G CI symbols are grouped to set a symbol set, the symbol sets of different reference resource regions may not be grouped identically.

[0295] In this case, the terminal may receive a plurality of 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 when a plurality of preemption according to an embodiment of the present invention is received.

[0297] Referring to FIG. 32, as shown in the figure, when the reference resource region contains 14 symbols and 2 symbols are grouped and divided on the time axis, the uplink preemption indicator can indicate, by 1 bit, whether the uplink transmission for the corresponding resource region is cancelled. In this case, when the value of the 1 bit is 1, the uplink transmission of the corresponding resource region may be cancelled.

[0298] For the first uplink preemption indicator UL CI#0 in FIG. 32, since another UL signal overlaps with the first symbol of the sixth symbol set, the bit value for that symbol set may be 1. For the second preemption indicator UL CI#1, another UL signal that overlaps in 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 for the third symbol set, the corresponding bit value may be set to 0.

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

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

[0301] As a second embodiment, the terminal can cancel uplink transmission that overlaps with a symbol for which cancellation is instructed in one UL CI. For example, in FIG. 28, when the bit value corresponding to the 6th symbol set of UL CI #0 is set to 1 and, in IL CI #1, the bit value corresponding to the 2nd symbol set is instructed to be 1, the terminal must cancel uplink transmission in a resource region that overlaps with the corresponding resource region and at least one symbol.

[0302] The reference resource region, as described above, may be grouped into G CI symbols on the time axis and divided into T pieces, and each divided resource region may be instructed whether uplink transmission is to be canceled by 1 bit of the uplink preemption indicator. In this case, when the reference resource regions indicated by different uplink preemption indicators overlap, a method for dividing the reference resource region is required. For example, the first uplink preemption indicator groups 1, 2, 3, 4, which are 4 symbols, into {1,2} and {3,4}, but the second uplink preemption indicator may group 2, 3, 4, 5, which are 4 symbols, into {2,3} and {4,5}.

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

[0304] Alternatively, when the reference resource regions indicated by different uplink preemption indicators overlap, when 2 or more G CI symbols are grouped to form a symbol set, it may be set so that the symbol sets of different reference resource regions are not grouped identically. In this case, the terminal may group G CI symbols regardless of the reference resource region to form a symbol set in order to group the symbol sets of different reference resource regions identically. Also, the terminal may determine the reference resource region using the 'X' and 'Y' values. The determined reference resource region may include only a part of the symbol set, and even when only a part is included, the entire symbol set may be determined to be included in the reference resource region.

[0305] FIG. 33 shows still another example when a plurality of pre-emptions according to an embodiment of the present invention are received. Referring to FIG. 33, as described above, G CIWhen the value of is 2, two symbols can be grouped to form a symbol set. In UL CI#1, the first and last symbols among the ‘Y’ symbols only include a part of the formed symbol set. In this case, the formed symbol set may be included in the reference resource region.

[0306] FIG. 34 shows still another example when a plurality of preambles according to an embodiment of the present invention are received.

[0307] Referring to FIG. 34, as described above, the reference resource region may be grouped into G CI symbols and divided into T, and each divided resource region may be indicated by 1 bit of the uplink preamble indicator whether the uplink transmission is canceled or not. In this case, the reference resource regions indicated by different uplink preamble indicators may overlap. When different reference resource regions overlap, when two or more G CI symbols are grouped to form a symbol set, the symbol sets of different reference resource regions may not be bundled identically. When the terminal bundles G CI symbols into a symbol set, the symbol sets of different reference resource regions can be bundled identically. 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 of 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 period for the PDCCH of the DCI including the uplink preamble indicator. When the reference resource region is delayed by 1 symbol, it can be confirmed that the boundaries where the symbol sets of the reference resource regions of UL CI#0 and UL CI#1 are separated are aligned. For example, as shown in Alt2 of FIG. 34, the position of the start symbol of the reference resource region in UL CI#1 is GCI - It is advanced by S symbols. Similarly, S = mod(P, G CI ) = 1 symbol. P is the number of symbols in the monitoring period for the PDCCH of the DCI including the uplink preemption indicator.

[0308] Still another problem to be solved by the present invention relates to a method of excluding a downlink symbol when the downlink symbol is located in the reference resource region. For each symbol, it may be set by the base station whether it is a downlink symbol, an uplink symbol, or a flexible symbol. In the case of a downlink symbol, the terminal expects to receive a downlink signal and does not expect to transmit an uplink signal. In the case of an uplink symbol, the terminal expects to transmit an uplink signal and does not expect to receive a downlink signal. For the terminal, it may be indicated by DCI format2_0 including scheduling of other signals or dynamic SFI whether the flexible symbol is a downlink symbol or an uplink symbol.

[0309] The uplink preemption indicator may be used to indicate, among the uplink signal and channels, the symbol for which the uplink transmission should be cancelled. Therefore, the downlink symbol does not need to be cancelled for transmission and reception by the uplink preemption indicator.

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

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

[0312] As a second embodiment, the terminal may select 'Y' symbols located 'X' symbols after the last symbol of the PDCCH including the uplink preemption indicator. At this time, the selected 'Y' symbols may be UL or flexible symbols excluding the downlink symbols. Further, the 'Y' symbols may be symbols excluding the symbols for receiving the SS / PBCH block. That is, in the second embodiment, the terminal can 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 set by the base station or symbols excluding the symbols for receiving the SS / PBCH block and / or the downlink symbols from among a plurality of symbols constituting the monitoring period of the PDCCH.

[0313] In the first embodiment and the second embodiment, the symbols for receiving the SS / PBCH block and / or the downlink symbols to be excluded may be limited to the symbols configured in a cell-common manner.

[0314] In the first embodiment, since the value of the number L of symbols included in the reference resource region is smaller than 'Y', it can be more finely divided and specifically indicated, and the cancellation of uplink transmission can be indicated with a smaller number of bits. In the second embodiment, since the reference resource region always includes 'Y' symbols, the cancellation of uplink transmission can always be indicated with the same fineness and number of bits. However, in the first and second embodiments, due to the configuration of the downlink symbols, the number of included symbols changes, so after the symbol set is grouped, the boundaries of the symbol sets between different reference resource regions may not match.

[0315] Therefore, in the third embodiment, the terminal can select 'Y' symbols located 'X' symbols after the last symbol of the PDCCH including the uplink preemption indicator, regardless of the downlink / uplink symbol configuration. Thereafter, the 'Y' symbols may be grouped into symbol sets according to the set granularity G CI Thereafter, when all the 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 bits of the uplink preemption indicator corresponding to the symbol sets where all symbols are set as downlink symbols may always be set to the value '0' that does not cancel uplink transmission.

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

[0317] Since the uplink preemption indicator is included in the DCI and transmitted, the maximum number of bits may be limited. For this reason, the number of bits of the uplink preemption indicator may be insufficient to associate each symbol and each PRB in the reference resource region with each bit of the uplink preemption indicator to indicate the cancellation of uplink transmission.

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

[0319] Hereinafter, a method for dividing the reference resource area into a plurality of areas will be described.

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

[0321] When the above terminal selects 'Y' symbols constituting the reference resource area, the number of symbols and / or the number of symbol sets included in the reference resource area may vary according to 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 area may be S. In this case, if B / S is divisible by F, as shown in FIG. 35, the PRBs in the frequency domain may be grouped and configured into F PRB sets. 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 set K PRBs included in the reference resource area from the base station. At this time, the setting method is as follows.

[0323] First Embodiment: It may be set in a RIV (resource indication value) method in which the index of the starting RB and the number of consecutive RBs from the starting RB are both encoded from the common reference PRB of the UL cell. 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 area and the number of consecutive RBs from the starting RB based on the common reference PRB using the RIV value. At this time, the index of the starting RB may be obtained based on the starting RB of the common reference PRB and the offset value.

[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 275 RBs, the maximum size, and the subcarrier spacing may be set by the base station.

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

[0326] The terminal can recognize the PRB configuration of the reference resource region based on the received RIV. At this time, the size of the BWP 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 having the lowest BWP ID of the cell.

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

[0328] In other words, the base station may group the RBs on the frequency axis of the reference resource region into a plurality of RB groups each composed of one or more RBs, and each RB group can be notified to the terminal in a bitmap manner. The terminal can receive from the base station a bit indicating an RB group constituting the reference resource region with a 1-bit value, and can 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, the method of constituting F PRB sets may be as follows. First, K - F * floor(K / F) PRB sets can include ceil(K / F) PRBs. The remaining F - (K - F * floor(K / F)) PRB sets can include floor(K / F) PRBs. In other words, the F PRB sets may be composed of F - (K - F * floor(K / F)) PRB sets including floor(K / F) PRBs and the remaining F - (K - F * floor(K / F)) PRB sets including ceil(K / F) PRBs.

[0330] Alternatively, in still another method of constituting F PRB sets when there are K PRBs in the frequency domain, the K PRBs may be grouped into Q RB groups. At this time, the method of grouping the RBGs may be grouped similarly to that grouped in resource allocation type 0. That is, considering the PRB grid, up to J RBs are bundled. 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, Q - F * floor(Q / F) PRB sets can include ceil(Q / F) RBGs, and the remaining F - (Q - F * floor(Q / F)) PRB sets can include floor(Q / F) RBGs.

[0331] FIG. 36 shows still another example of a method of dividing the time - frequency domain of the resource indicated by the 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 of the reference resource region may be grouped differently according to the symbol sets.

[0333] Specifically, 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, that is, when B is not divisible by S, the PRBs in the reference resource region may be configured as a PRB set in the following manner.

[0334] First Embodiment: All symbol sets may be divided into F PRB sets. At this time, F may be floor(B / S). For example, when B is '28' and S is '8', the value of F can be 3. That is, each symbol set may be divided into 3 PRB sets on the frequency axis. In this case, only S*F = 3*8 = 24 bits are valid, and the remaining 4 bits do not have corresponding symbol - PRB sets and thus may not be used for canceling uplink transmission. That is, the remaining 4 bits may not be used.

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

[0336] That is, in FIG. 36, the four symbol sets in the front are divided into F1 PRB sets on the frequency axis, and the four symbol sets in the back are divided into F2 PRB sets on the frequency axis. Conversely, the four symbol sets in the front may be divided into F2 PRB sets on the frequency axis, and the four symbol sets in the back 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 FIG. 32, the boundary for dividing into F1 PRB sets and the boundary for dividing into F2 PRB sets are shown as different on the frequency axis, but this 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 and configured as one set. Conversely, when dividing into 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 and configured.

[0338] For different numerologies

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

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

[0341] Specifically, the numerology can include subcarrier spacing or cyclic prefix. The carrier spacing is 15 * 2 kHz, μ is a subcarrier spacing configuration value and has values such as 0, 1, 2, 3, etc., and the CP type may be distinguished into normal CP and extended CP.

[0342] In the case of normal CP, 14 OFDM symbols may be included in 1 slot of 1 * 2 -μ ms, and in the case of extended CP, 12 OFDM symbols may be included in 1 slot of 1 * 2 -μ ms. The extended CP may be set in the case of a 60 kHz subcarrier spacing (μ = 2). Such numerology may be set in the BWP of the uplink carrier and the BWP of the downlink carrier.

[0343] Hereinafter, the subcarrier spacing of the PUSCH or SRS transmitted in the uplink BWP is μ UL and the subcarrier spacing of the PDCCH of the uplink preemption indicator received in the downlink BWP is μ DL shall be.

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

[0345] The reference resource region is a set of uplink resources whose uplink transmission may be cancelled by the uplink preemption indicator. Here, the uplink resources can include PRBs and symbols. The PRB may be part or all of the PRBs included in the BWP of the uplink cell. Specifically, the terminal may be set by the base station which of the PRBs in the BWP of the uplink cell are included in the reference resource region.

[0346] Specifically, for the subcarrier having the lowest index of the common reference PRB, an ARFCN (absolute radio-frequency channel number) may be set as the subcarrier. The subcarrier having the lowest index can 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 set by the base station, it can be assumed that there are 275 consecutive PRBs including the common reference PRB. All of the 275 PRBs do not have to be PRBs capable of uplink transmission. It may be set which of the 275 PRBs are included in the reference uplink resource. That is, the terminal may set the PRBs included in the reference resource region among the 275 PRBs by the RIV (resource indication value) method in which both the index of the starting RB (starting RB index, RB start ) and the number of RBs (L RBs ) are encoded together. 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 in the following mathematical formula [Formula 9]. In this mathematical formula, it is [Formula 8].

[0349]

Number

[0350]

Number

[0351] In order to determine the PRBs included in the reference resource region, it is necessary to determine the subcarrier spacing. The subcarrier spacing for determining the reference resource region may be the subcarrier spacing (μ DL ) of the downlink BWP of the PDCCH on which the uplink preemption indicator is transmitted. The subcarrier spacing (μ DL ) of the downlink BWP may be the same as or different from the subcarrier spacing (μ UL ) of the PUSCH or SRS transmitted in the uplink BWP.

[0352] If the subcarrier spacing (μ DL ) of the downlink BWP of the PDCCH on which the uplink preemption indicator is transmitted is different from the subcarrier spacing (μ UL ) of the uplink transmission (e.g., PUSCH or SRS), the PRBs included in the reference resource region determined by the RIV method may be determined in the following manner.

[0353] Figs. 37 to 39 show a method for determining the PRBs included in the reference resource region when the subcarrier spacing of the PDCCH is different from the subcarrier spacing of the uplink transmission.

[0354] Fig. 37 shows an example of the PRBs indicated by preemption according to an embodiment of the present invention.

[0355] In Fig. 37, the RB start of the reference resource region on the frequency axis is 5, and L RBs is 8. At this time, the common reference PRB is the PRB including O carrier , and the index of this PRB is 0. As described above, the reference resource region (RIV-indicated reference UL resource) composed of the PRBs indicated by the RIV transmitted by the higher layer signaling of the base station may be determined based on the subcarrier spacing (μ DL ) of the activated downlink BWP of the PDCCH on which the uplink preemption indicator is transmitted. That is, the subcarrier spacing (μ where the PUSCH or SRS is actually transmittedDL ) is not related. Therefore, it is necessary to determine the uplink PRBs actually included in the reference resource region from the reference resource region composed of the PRBs indicated by RIV.

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

[0357] FIG. 38(a) shows the subcarrier spacing (μ DL ) of the PDCCH in which the uplink preemption indicator is transmitted, which is larger than the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission. For example, the subcarrier spacing of the PDCCH that transmits the uplink preemption indicator is 30 kHz (μ DL = 1), and the subcarrier spacing of the PUSCH or SRS transmission that is the uplink transmission is 15 kHz (μ UL = 0). The bandwidth of one PRB determined by the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator can include a plurality of PRBs determined by the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission. More precisely, the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator and the bandwidth of one PRB determined thereby can include 2 ^ (μ DL - μ UL ) PRBs determined by the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission.

[0358] As an embodiment of the present invention, a method for determining the uplink reference resource in a situation where the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator is larger than the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission is as follows.

[0359] First Embodiment: The subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preamble indicator may be used to determine the reference resource region. The uplink PRBs actually included in the reference resource region may be determined as all the PRBs included in the bandwidth occupied by the reference resource region indicated by the RIV. For example, 2^(μ DL -μ UL ) uplink PRBs overlapping with the bandwidth of one PRB included in the reference resource region indicated by the RIV transmitted from the base station may be included in the actual reference resource region.

[0360] Second Embodiment: The RIV may be interpreted using the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preamble indicator, and the reference resource region indicated by the interpreted RIV may be determined. Then, the start RB index (RB start UL ) of the uplink PRBs included in the reference resource region and the number of consecutive PRBs (L RBs UL ) may be obtained by the following mathematical formula based on RB start and L RBs obtained from the RIV.

[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 uses the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission to start from the common reference RB to the PRB corresponding to the start RB index (RB start UL ) and L RBs ULIt can be determined that a single PRB is included in the uplink reference resource.

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

[0365] The subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission and the bandwidth of one determined PRB can include a plurality of PRBs determined by the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator. More precisely, the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission and the bandwidth of one determined PRB can include 2 ^ (μ DL - μ UL - μ DL ) determined PRBs.

[0366] As an embodiment of the present invention, a method for determining an uplink reference resource in a situation where the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator is smaller than the subcarrier spacing (μ UL ) of the PUSCH or SRS transmission that is the uplink transmission is as follows.

[0367] First, the subcarrier spacing (μ DL) may be used to interpret the RIV, and the 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 the PRBs that are wholly or partially included in the bandwidth occupied by the reference resource region determined based on the RIV.

[0368] Second, the RIV may be interpreted using the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator, and the 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 the PRBs that are wholly included in the bandwidth occupied by the reference resource region indicated by the RIV.

[0369] Third, the RIV may be interpreted using the subcarrier spacing (μ DL ) of the PDCCH that transmits the uplink preemption indicator, and the reference resource region on the frequency axis indicated by the RIV may be determined. Then, the starting RB index (RB start UL ) of the uplink PRBs included in the reference resource region and the number of consecutive PRBs (L RBs UL ) may be obtained from the RB start and L RBs obtained from the RIV according to 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 uses the subcarrier spacing (μ ULUsing it, starting from the common reference RB, the RB index (RB start UL ) corresponding to the PRB from which L RBs UL PRBs can be determined to be included in the uplink reference resource.

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

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

[0376] In the first and second embodiments, the terminal can expect that the values of RB start and L RBs indicated by the RIV have values divisible by at least 2^(μ UL - μ DL ). That is, the terminal expects that the values of RB start and L RBs indicated by the RIV have values of 2^(μ UL - μ DLIt can be expected that there is no value that cannot be divided by . Such a restriction can prevent an uplink PRB from partially overlapping with a PRB included in a reference resource region on the frequency axis indicated by the RIV.

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

[0378] Hereinafter, a method for determining the offset value O carrier in FIGS. 37 to 39 will be 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 spacing. The terminal recognizes the RBs that do not use O carrier RBs from the common reference PRB. The value of O carrier is a value set for each cell in a cell-common manner. Also, the value of O carrier is a value set for each value of the subcarrier spacing of the cell.

[0380] Specifically, O carrier may be set by the upper layer as follows. The SIB (system information block) may include a FrequencyInforDL-SIB that includes information related to the downlink carrier and reception. The 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 Point A

[0383] - scs-SpecificCarrierList: Includes values such as O carrier (offsetToCarrier) for each subcarrier spacing. The network must configure scs-SpecificCarrierList for all subcarrier spacings used for the downlink BWP of the cell.

[0384] Also, the SIB can include FrequencyInforUL-SIB that contains information related to the basic uplink carrier and transmission. FrequencyInforUL-SIB (or FrequencyInforUL) can contain the following information.

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

[0386] - offsetToPointA: Position of Point A

[0387] - scs-SpecificCarrierList: Includes values such as O carrier (offsetToCarrier) for each subcarrier spacing. The network must configure scs-SpecificCarrierList for all subcarrier spacings used for the uplink BWP of the cell

[0388] With such upper layer configurations, the terminal can know the following.

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

[0390] 2) The subcarrier spacings available for each carrier (other subcarrier spacings are not available for the carrier.)

[0391] 3) O by the subcarrier spacing of each carrier carrier value (offsetToCarrier)

[0392] The terminal sets a DL BWP that monitors the uplink preamble indicator. Specifically, there is a DL BWP that includes a search space for monitoring the uplink preamble indicator, and the terminal can use the subcarrier spacing of the DL BWP to determine the reference resource area of the uplink preamble indicator. Such a subcarrier spacing can be referred to as the reference subcarrier spacing.

[0393] If the reference subcarrier spacing may not be included in the FrequencyInforUL-SIB (or, FrequencyInforUL) of the uplink cell. As described above, FrequencyInforUL-SIB (or, FrequencyInforUL) is the O of the subcarrier spacing supported by the uplink cell carrier value (offsetToCarrier) is included.

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

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

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

[0397] Referring to FIG. 40, O carrier,DL may be obtained in the following manner.

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

[0399] Specifically, O carrier,DL can be obtained by floor(O carrier,activeUL *S). Here, S = SCS activeUL / SCS ref may be given. Floor may be replaced by ceil or round.

[0400] Second Embodiment: The terminal scales the value (offsetToCarrier) set by the maximum subcarrier spacing value (hereinafter, SCS max ) among the subcarrier spacings in the scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL) by a reference subcarrier spacing, and the O carrier value (O carrier,DL ) of the reference resource area indicated by the uplink preemption indicator can be obtained.

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

[0402] For example, when the uplink cell can use 15 kHz and 30 kHz as subcarrier spacings, the offsetToCarrier corresponding to the larger value of 15 kHz and 30 kHz, which is 30 kHz, is O max . In the second embodiment, even if the terminals of the uplink cell use UL BWPs with different subcarrier spacings from each other, the same O carrier,DL value can be obtained. Thereby, it is possible to have the frequency band of the same reference resource region.

[0403] Third Embodiment: The terminal scales the value (offsetToCarrier) set by the minimum subcarrier spacing value (hereinafter, SCS min ) among the subcarrier spacings indicated in the scs-SpecificCarrierList of FrequencyInforULSIB (or, FrequencyInforUL) according to the reference subcarrier spacing, and obtains the O carrier value (O carrier,DL ) of the reference resource region indicated by the uplink preemption indicator. Specifically, the value of O carrier,DL may be obtained by floor(O min *S). S may be given by SCS min / SCS ref . Here, SCS minis the minimum value among the subcarrier spacings supported in the uplink cell and is the minimum subcarrier value among the subcarrier spacings included in the scsSpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL). Floor may be replaced by ceil or round. O min is the value (offsetToCarrier) set by the minimum subcarrier value among the subcarrier values included in the scsSpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL).

[0404] For example, when the uplink cell can use 15 kHz and 30 kHz as subcarrier spacings, the offsetToCarrier corresponding to the smaller value of 15 kHz and 30 kHz, which is 15 kHz, is O min is. The second embodiment allows the same O carrier,DL value to be set even when the terminals in the uplink cell use UL BWPs with different subcarriers. Thereby, the same frequency band of the reference resource region may be set for each terminal.

[0405] Fourth Embodiment: The terminal determines the value of the reference resource region indicated by the uplink preemption indicator based on the minimum value among the values (offsetToCarrier) set according to the subcarrier spacing indicated in the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). O carrier value (O carrier,DL ). Specifically, the value of O carrier,DL may be obtained by floor(min_O carrier *S). The value of S is min_SCS / SCS refmay be given. Here, min_SCS is the subcarrier spacing corresponding to min_Ocarrier. That is, it is the subcarrier spacing value corresponding to the minimum 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. As another method, O carrier,DL is min_O carrier may be obtained by. min_O carrier is the minimum value among the values (offsetToCarrier) set by the subcarrier spacing included in the scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL).

[0406] Example 5: The terminal uses the maximum value among the values (offsetToCarrier) set by the subcarrier spacing indicated in the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL) to determine the O carrier value (O carrier,DL ) of the reference resource area indicated by the uplink preemption indicator. Specifically, the value of O carrier,DL may be obtained by floor(max_O carrier *S). The value of S is max_SCS / SCS ref may be given. Here, max_SCS is the subcarrier spacing corresponding to max_O carrier That is, it is the subcarrier spacing value corresponding to the maximum value among the subcarrier spacing values included in the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL). Floor may be replaced by ceil or round. As another method, O carrier,DL may be obtained by max_O carrier ​carrier is the maximum value of the value (offsetToCarrier) set by the subcarrier spacing included in the scs-SpecificCarrierList of FrequencyInforUL-SIB (or FrequencyInforUL).

[0407] Sixth Embodiment: The terminal uses the offsetToCarrier that indicates the lowest position among the actual frequency positions indicated by the value (offsetToCarrier) set by the subcarrier value indicated by the scs-SpecificCarrierList of FrequencyInforULSIB (or FrequencyInforUL) to obtain the O of the reference resource area indicated by the uplink preamble indicator carrier value (O carrier,DL ). Specifically, the value of O carrier,DL may be obtained by floor(min2_O carrier *S). S may be given as min2_SCS / SCS ref . Floor may be replaced by ceil or round. As another method, the value of O carrier,DL may be obtained by min2_O carrier . min2_O carrier may be determined based on offsetToCarrier.

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

[0409] In the sixth embodiment, the terminal may include all PRBs in the reference resource region regardless of which UL BWP is set, by including an offsetToCarrier that indicates the lowest position among the actual frequency positions.

[0410] Seventh embodiment: The terminal uses an offsetToCarrier that indicates the highest position among the actual frequency positions indicated by the value (offsetToCarrier) set by the subcarrier value indicated by the scs-SpecificCarrierList of FrequencyInforULSIB (or, FrequencyInforUL), so that the O carrier value (O carrier,DL ) of the reference resource region indicated by the uplink preemption indicator can be obtained. Specifically, the value of O carrier,DL may be obtained by floor(max2_O carrier *S). S may be given as max2_SCS / SCS ref . Floor may be replaced by ceil or round. As another method, the value of O carrier,DL may be obtained by max2_O carrier . max2_O carrier may be determined based on the offsetToCarrier.

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

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

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

[0414] That is, O which is the offset value of the reference resource area by the upper layer carrier,DLWhen [the relevant information] is transmitted, the terminal can determine the PRBs on the frequency axis of the reference resource area based on the value transmitted by the upper layer. In other cases, when the offsetToCarrier value for the subcarrier spacing of the DL BWP for which the uplink preemption indicator is received is not included in the FrequencyInforUL-SIB (or FrequencyInforUL), the value of O may be calculated according to the first to seventh embodiments. carrier,DL The value of [O] may be calculated.

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

[0416] Referring to FIG. 41, when the terminal receives DCI including an indicator for instructing cancellation of the scheduled resource for uplink transmission, the terminal can cancel the uplink transmission for the resource area indicated by the indicator.

[0417] Specifically, the terminal receives configuration information for receiving a physical downlink control channel (PDCCH) (S41010). At this time, the configuration information can 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 PRB position on the frequency axis to identify the reference resource area, which is the cancellable resource area.

[0418] In addition, the configuration information can inform the terminal in a bitmap manner of the position of the symbol in which the PDCCH of the DCI including an indicator for instructing part or all of the time-frequency resources for canceling the uplink transmission is transmitted. For example, the position of the symbol in which the PDCCH is transmitted can be indicated to the terminal using the value of each bit.

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

[0420] The DCI can include an indicator that indicates part or all of the time - frequency resources for canceling the uplink transmission.

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

[0422] Also, the time - frequency resources for uplink transmission are resources from which specific resources are excluded from a reference resource region, and the number of symbols in the reference resource region may be determined based on the monitoring period for monitoring the PDCCH or a previously set value.

[0423] For example, the reference resource region may be composed of 'Y' consecutive symbols starting from a start symbol located 'X' symbols after the last symbol in which the PDCCH was detected. The time - frequency resources for uplink transmission are resources from which specific resources are excluded from a reference resource region, and the number of symbols in the reference resource region may be determined based on the monitoring period for monitoring the PDCCH or a previously set value.

[0424] At this time, the resources for the uplink transmission to be canceled are the resources scheduled for uplink transmission before the PDCCH of the DCI including the indicator that indicates part or all of the time - frequency resources for canceling the uplink transmission is detected.

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

[0426] Referring to FIG. 42, the base station can cancel by transmitting a DCI including an indicator for canceling the setting of the resources scheduled for uplink transmission, which indicates the cancellation of uplink transmission.

[0427] Specifically, the base station transmits (S42010) configuration information for receiving a physical downlink control channel (PDCCH) to the terminal. At this time, the configuration information can include at least one of the above-described '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 area that is a cancellable resource area.

[0428] In addition, the configuration information can notify the terminal in a bitmap manner of the position of the symbol in which the PDCCH including the DCI (downlink control information) indicating a part or all of the time-frequency resources for canceling the uplink transmission is transmitted. For example, the position of the symbol in which the PDCCH is transmitted can be indicated to the terminal using the value of each bit.

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

[0430] The DCI can include an indicator indicating a part or all of the time-frequency resources for canceling the uplink transmission.

[0431] The subcarrier spacing of at least one symbol whose uplink transmission cancellation is indicated by an 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 transmitted.

[0432] Also, the time-frequency resource for uplink transmission is a resource from which a specific resource is excluded 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 preset value.

[0433] For example, the reference resource region may be composed of 'Y' consecutive symbols starting from a start symbol located 'X' symbols after the last symbol in which the PDCCH is detected. The time-frequency resource for uplink transmission is a resource from which a specific resource is excluded 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 preset value.

[0434] At this time, the resource for the uplink transmission to be cancelled is a resource scheduled for uplink transmission before the PDCCH of the DCI including an indicator instructing cancellation of part or all of the time-frequency resource for uplink transmission is detected.

[0435] The foregoing description of the present invention is for illustrative purposes, and those having ordinary knowledge in the technical field to which the present invention pertains will be able to understand that it can be easily modified into another specific form without changing the technical idea and essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented dispersedly, and similarly, components described as being dispersed may also be implemented in a combined form.

[0436] The scope of the present invention is defined by the claims described below rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Explanation of Reference Numerals

[0437] 100 Terminal 110 Processor 120 Communication Module 121 Cellular Communication Interface Card 122 Cellular Communication Interface Card 123 Unlicensed Band Communication Interface Card 130 Memory 140 User Interface 150 Display Unit 200 Base Station 210 Processor 220 Communication Module 221 Cellular Communication Interface Card 222 Cellular Communication Interface Card 223 Unlicensed Band Communication Interface Card 230 Memory

Claims

1. A terminal of a wireless communication system, comprising: a communication module; and a processor configured to control the communication module, wherein the processor is configured to: receive radio resource control (RRC) configuration information; receive a physical downlink control channel (PDCCH) including downlink control information (DCI) in a specific format; the DCI includes an uplink cancellation indicator (UL CI) indicating whether uplink transmission in an uplink bandwidth part (UL BWP) is cancelled; the RRC configuration information includes a resource indication value (RIV) related to a reference resource region; the RIV is related to an index of a starting resource block (RB) and the number of consecutive RBs; the index of the starting RB is used to determine an index of a starting physical resource block (PRB) of the reference resource region; the RIV related to the reference resource region is interpreted under the assumption that the size of the UL BWP is 275 RBs; in the reference resource region, symbol parameters related to at least one symbol included in a resource region where it is indicated whether uplink transmission is cancelled by the UL CI are determined based on a subcarrier spacing of a downlink bandwidth part (DL BWP) in which the DCI in the specific format is monitored. A terminal.

2. In the reference resource region, the resource region includes a symbol for a synchronization signal / physical broadcast channel (SS / PBCH) and at least one symbol excluding DL symbols from the reference resource region, The number of symbols in the reference resource region is determined based on a monitoring period for monitoring the PDCCH or based on a previously set value. The terminal according to claim 1.

3. The starting symbol of the reference resource region is a symbol located 'X' symbols after the symbol in which the PDCCH is received. The terminal according to claim 2.

4. The value of 'X' depends on a first subcarrier spacing, The first subcarrier spacing is the minimum value between the subcarrier spacing of the DL BWP in which the DCI is monitored and the minimum subcarrier spacing among the subcarrier spacings of uplink cells. The terminal according to claim 3.

5. The terminal according to claim 1, wherein the resource region includes a group of resources in which whether or not each group is cancelled is indicated by each bit of the UL CI.

6. The terminal according to claim 1, wherein the resource region includes a first plurality of groups of resources in the time domain each including at least one symbol in the time domain and at least one second group each including at least one physical resource block (PRB) in the frequency domain.

7. If scheduling information for physical uplink shared channel (PUSCH) transmission is received before the PDCCH including the DCI is received, and a region in which cancellation of the UL transmission is indicated by the UL CI overlaps with part or all of the uplink resources allocated to the PUSCH transmission by the scheduling information, the PUSCH transmission is cancelled. The terminal according to claim 1.

8.

9. The terminal according to claim 1, wherein the index of the start PRB of the reference resource region is obtained by adding an offset value to the index of the start RB.

10.

11. A method for receiving downlink control information in a wireless communication system, comprising: receiving radio resource control (RRC) configuration information, and receiving a physical downlink control channel (PDCCH) including downlink control information (DCI) of a specific format, wherein the DCI includes an uplink cancellation indicator (UL CI) indicating whether or not to cancel UL transmission in an uplink bandwidth part (UL BWP), the RRC configuration information includes a resource indication value (RIV) related to a reference resource region, the RIV is related to an index of a start resource block (RB) and the number of consecutive RBs, the index of the start RB is used to determine an index of a start physical resource block (PRB) of the reference resource region, and the RIV related to the reference resource region is interpreted under the assumption that the size of the UL BWP is 275 RBs. In the reference resource region, a symbol parameter related to at least one symbol included in a resource region in which it is indicated whether UL transmission is cancelled by the UL CI is determined based on a subcarrier spacing of a downlink bandwidth part (DL BWP) in which the DCI of the specific format is monitored.

10. The resource region in the reference resource region includes at least one symbol excluding symbols for a synchronization signal / physical broadcast channel (SS / PBCH) and DL symbols from the reference resource region. The method according to claim 9, wherein the number of symbols in the reference resource region is determined based on a monitoring period for monitoring the PDCCH or based on a preset value.

11. The method according to claim 10, wherein the start symbol of the reference resource region is a symbol located 'X' symbols after the symbol in which the PDCCH was received.

12. The value of 'X' depends on a first subcarrier. The method according to claim 11, wherein the first subcarrier spacing is the minimum value between the subcarrier spacing of the DL BWP in which the DCI is monitored and the minimum subcarrier spacing among the subcarrier spacings of uplink cells.

13. The method according to claim 9, wherein the resource region includes a group of resources in which it is indicated whether each group is cancelled by each bit of the UL CI.

14. The method according to claim 9, wherein the resource region includes a first plurality of groups of resources each including at least one symbol in a time domain and at least one second group each including at least one physical resource block (PRB) in a frequency domain.

15. If scheduling information for physical uplink shared channel (PUSCH) transmission is received before the PDCCH including the DCI is received, and a region in which UL transmission is cancelled is indicated by the UL CI overlaps with part or all of the uplink resources allocated to the PUSCH transmission by the scheduling information, the PUSCH transmission is cancelled. The method according to claim 9.

16. The method according to claim 9, wherein the index of the start PRB of the reference resource region is obtained by adding an offset value to the index of the start RB.

Images