Data transmission method and reception method for wireless communication system, and device using same

Abstract

To disclose a base station for a wireless communication system.SOLUTION: Each base station in a wireless communication system includes a communication module and a processor. When a terminal accesses a cell of the base station in the wireless communication system, the processor receives a radio resource control (RRC) signal via the communication module and determines a time-frequency resource that corresponds to at least one resource set indicated by the RRC signal. The processor receives a physical control channel from the base station via the communication module after the cell access, determines, based on the physical control channel, a time-frequency resource area in which reception of a physical data channel of the terminal is scheduled, and receives the physical data channel based on time-frequency resources where the at least one resource set overlaps with time-frequency resources where the reception of the physical data channel of the terminal is scheduled. The resource set is a set of time-frequency resources.SELECTED DRAWING: Figure 15

Description

[Technical field]

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

[0002] Following the commercialization of 4G (4th generation) communication systems, efforts are being made to develop new 5G (5th generation) communication systems to meet the increasing demand for wireless data traffic. 5G communication systems are referred to as communication systems beyond 4G networks, systems beyond LTE systems, or new radio (NR) systems. In order to achieve high data transmission rates, 5G communication systems include systems operated using ultra-high frequency (mmWave) bands of 6 GHz or higher, and also include communication systems operated using frequency bands below 6 GHz in terms of ensuring coverage, and implementation in base stations and terminals is being considered.

[0003] The 3GPP (registered trademark, hereinafter the same) (3rd generation partnership project) NR system improves the efficiency of network spectrum, allowing carriers to provide more data and voice services with a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting large capacity voice. The advantages of the NR system are that it has high throughput, low latency, FDD (frequency division duplex) and TDD (time division duplex) support on the same platform, improved end user environment, and low operating costs with a simple architecture.

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

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

[0006] Meanwhile, the Internet is a human-centered network where humans generate and consume information, and is evolving into the Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. The Internet of Everything (IoE) technology is also emerging, which combines big data processing technology through connection with cloud servers with IoT technology. To realize IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, technologies such as sensor networks for connecting objects, machine to machine (M2M), and machine type communication (MTC) are being researched. In the IoT environment, intelligent IT (internet technology) services are provided that collect and analyze data generated from connected objects and create new value in human life. IoT is applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through the fusion and integration of conventional IT technology and various industries.

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

[0008] However, the mobile communication system has gradually expanded its service area from voice to data services, and is currently developed to the extent that it provides high-speed data services. However, due to the resource shortage phenomenon in the currently provided mobile communication system and the demand for high-speed services from users, a more advanced mobile communication system is required. Summary of the Invention [Problem to be solved by the invention]

[0009] An object of an embodiment of the present invention is to provide a method for efficiently transmitting a signal in a wireless communication system, and an apparatus therefor. Also, an object of an embodiment of the present invention is to provide a data transmission method, a data reception method, and an apparatus using the same in a wireless communication system. [Means for solving the problem]

[0010] A terminal of a wireless communication system according to an embodiment of the present invention includes a communication module and a processor for controlling the communication module. The processor receives a radio resource control (RRC) signal from a base station of the wireless communication system via the communication module, determines a time-frequency resource corresponding to at least one resource set indicated by the RRC signal, receives a physical control channel from the base station via the communication module, determines a time-frequency resource region in which the terminal is scheduled to receive a physical data channel by the physical control channel, and receives a physical data channel based on a time-frequency resource in which the terminal is scheduled to receive a physical data channel and the at least one resource set overlap. In this case, the resource set is a set of time-frequency resources.

[0011] The overlapping time-frequency resources are divided into a plurality of sub-resource sets, and the processor acquires a rate matching indicator indicating whether the physical data channel is not available for each of the plurality of sub-resource sets from the physical control channel, determines whether the physical data channel is not available for each of the sub-resource sets according to the rate matching indicator, and receives the physical data channel by determining whether the physical data channel is not available for each of the sub-resource sets on the time-frequency resources corresponding to the sub-resource sets.

[0012] The sub-resource sets are divided based on the frequency domain, without any division in the time domain, among the overlapped time-frequency resources.

[0013] Each of the at least one resource set is identified by a different index, the rate matching indicator is comprised of a plurality of bits, and a sub-resource set indicated by each of the plurality of bits is determined based on the index.

[0014] If the time-frequency resource for which the terminal is scheduled to receive the physical data channel does not overlap with the at least one resource set, the processor receives the physical data channel in the time-frequency resource region for which the terminal is scheduled to receive the physical data channel, regardless of the rate matching indicator.

[0015] The physical control channel is received in a first slot. If the time-frequency resource for which the physical data channel is scheduled and the at least one resource set overlap in a second slot in which the physical data channel is received, the processor performs rate matching to receive the physical data channel in a time-frequency resource excluding the time-frequency resource for which the physical data channel is scheduled and the at least one resource set overlap from the time-frequency resource for which the physical data channel is scheduled in the second slot. In this case, the first slot and the second slot are different slots.

[0016] A terminal of a wireless communication system according to an embodiment of the present invention includes a communication module and a processor for controlling the communication module, the processor receiving a physical control channel and, if reception of a physical data channel of the terminal is scheduled for a plurality of slots by the physical control channel, receiving the physical data channel based on the same orthogonal frequency division multiplexing (OFDM) symbol positions in all slots in which the physical data channel is transmitted.

[0017] The physical control channel is transmitted in a first slot. The processor receives an RRC signal from a base station of the wireless communication system via the communication module, determines a time-frequency resource corresponding to at least one resource set indicated by the RRC signal, and performs rate matching to receive the physical data channel in a time-frequency resource excluding the time-frequency resource in which the physical data channel is scheduled in the second slot and the time-frequency resource in which the at least one resource set overlaps from the time-frequency resource in which the physical data channel is scheduled in the second slot, if the time-frequency resource in which the physical data channel is scheduled in the second slot overlaps with the time-frequency resource in which the at least one resource set overlaps. The first slot and the second slot are different slots.

[0018] In each of the plurality of slots, the positions of the time-frequency resources corresponding to the resource set where the physical data channel cannot be received are the same. The processor performs rate matching for receiving the physical data channel on the time-frequency resources obtained by excluding the time-frequency resources corresponding to the positions from the time-frequency resources corresponding to the physical data channel scheduled in each of the plurality of slots.

[0019] The OFDM symbol position is indicated by the physical control channel.

[0020] A method for operating a terminal of a wireless communication system according to an embodiment of the present invention includes the steps of receiving an RRC signal from a base station of the wireless communication system via the communication module, determining time-frequency resources corresponding to at least one resource set indicated by the RRC signal, receiving a physical control channel from the base station via the communication module, determining a time-frequency resource region in which the terminal is scheduled to receive a physical data channel by the physical control channel, and receiving a physical data channel based on a time-frequency resource in which the terminal is scheduled to receive a physical data channel and the at least one resource set overlap, the resource set being a set of time-frequency resources.

[0021] The overlapping time-frequency resources are divided into a plurality of sub-resource sets. The step of determining a time-frequency resource region in which the terminal is scheduled to receive a physical data channel by the physical control channel includes a step of acquiring a rate matching indicator indicating whether the terminal is capable of receiving the physical data channel for each of the plurality of sub-resource sets from the physical control channel. The step of receiving the physical data channel includes a step of determining whether the terminal is capable of receiving the physical data channel in the time-frequency resource corresponding to the sub-resource set for each of the sub-resource sets according to the rate matching indicator, and receiving the physical data channel.

[0022] The sub-resource sets are divided based on the frequency domain, without any division in the time domain, among the overlapped time-frequency resources.

[0023] Each of the at least one resource set is identified by a different index, the rate matching indicator is comprised of a plurality of bits, and a sub-resource set indicated by each of the plurality of bits is determined based on the index.

[0024] The step of receiving the physical data channel includes a step of receiving the physical data channel in a time-frequency resource region in which the terminal is scheduled to receive the physical data channel, regardless of the rate matching indicator, if none of the time-frequency resources in which the terminal is scheduled to receive the physical data channel overlaps with the at least one resource set.

[0025] The physical control channel is transmitted in a first slot. The step of receiving the physical data channel includes performing rate matching for receiving the physical data channel in a time-frequency resource, excluding the time-frequency resource where the physical data channel is scheduled and the time-frequency resource where the at least one resource set overlaps from the time-frequency resource where the physical data channel is scheduled in the second slot, if the time-frequency resource where the physical data channel is scheduled and the at least one resource set overlap in the second slot. The first slot and the second slot are different slots.

[0026] An operating method of a terminal in a wireless communication system according to one embodiment of the present invention includes a step of receiving a physical control channel, and if reception of a physical data channel of the terminal is scheduled to multiple slots by the physical control channel, a step of receiving the physical data channel based on the position of the same OFDM symbol in all slots in which the physical data channel is transmitted.

[0027] The physical control channel is transmitted in a first slot. The method further includes receiving an RRC signal from a base station of the wireless communication system via the communication module, and determining time-frequency resources corresponding to at least one resource-set indicated by the RRC signal.

[0028] The step of receiving the physical data channel includes, if the at least one resource set overlaps with a time-frequency resource in which the physical data channel is scheduled in a second slot included in the plurality of slots, performing rate matching to receive the physical data channel on a time-frequency resource obtained by excluding a time-frequency resource in which the physical data channel is scheduled in the second slot and a time-frequency resource in which the at least one resource set overlaps with the time-frequency resource in which the physical data channel is scheduled in the second slot from the time-frequency resource in which the physical data channel is scheduled in the second slot, The first slot and the second slot are different slots.

[0029] In each of the plurality of slots, the positions of the time-frequency resources corresponding to the resource set in which the physical data channel cannot be received are the same. The step of receiving the physical data channel performs rate matching for receiving the physical data channel on time-frequency resources obtained by excluding the time-frequency resources corresponding to the positions from the time-frequency resources corresponding to the physical data channel scheduled in each of the slots.

[0030] The OFDM symbol position is indicated by the physical control channel. Effect of the Invention

[0031] One embodiment of the present invention provides a method for efficiently transmitting and receiving signals in a wireless communication system, and an apparatus for utilizing the same.

[0032] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0033] [Figure 1] FIG. 2 is a diagram illustrating an example of a radio frame structure used in a wireless communication system. [Diagram 2] FIG. 1 is a diagram illustrating an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Diagram 3] 1 is a diagram illustrating physical channels used in the 3GPP system and a general signal transmission method using the corresponding physical channels. [Figure 4] A diagram showing SS / PBCH blocks for initial cell access in a 3GPP NR system. [Diagram 5] A diagram showing a procedure for control information and control channel transmission in a 3GPP NR system. [Figure 6] FIG. 1 is a diagram showing a control resource set (CORESET) in which a physical downlink control channel (PDCCH) is transmitted in a 3GPP NR system. [Figure 7] A diagram showing a method for setting a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 1 is a conceptual diagram illustrating carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining single carrier communication and multi-carrier communication. [Figure 10] A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 11] 2 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention. [Figure 12] A diagram showing resource sets used in a wireless communication system according to an embodiment of the present invention. [Figure 13] 1 is a diagram showing a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention. [Figure 14] 1 is a diagram showing a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention. [Figure 15]A diagram showing a terminal of a wireless communication system according to an embodiment of the present invention receiving a PDSCH in a RESET set in the terminal. [Figure 16] A diagram showing a terminal of a wireless communication system according to an embodiment of the present invention receiving a PDSCH in a RESET set in the terminal. [Figure 17] 1 is a diagram showing a terminal receiving a PDSCH when cross-slot scheduling is performed in a wireless communication system according to an embodiment of the present invention. [Figure 18] A diagram showing a terminal receiving a PDSCH when slot-binding based scheduling is performed in a wireless communication system according to an embodiment of the present invention. [Figure 19] A diagram showing a terminal receiving a PDSCH when slot-binding based scheduling is performed in a wireless communication system according to an embodiment of the present invention. [Figure 20] FIG. 2 is a diagram illustrating an example of sub-resource sets used in a wireless communication system according to an embodiment of the present invention. [Figure 21] 1 is a diagram illustrating a terminal receiving a PDSCH based on an overlapping resource set in a wireless communication system according to an embodiment of the present invention. [Figure 22] FIG. 13 illustrates a case where time-frequency resources indicated to be occupied by different RESETs overlap. [Figure 23] FIG. 13 illustrates a case where time-frequency resources indicated to be occupied by different RESETs overlap. [Figure 24] FIG. 13 illustrates a case where time-frequency resources indicated to be occupied by different RESETs overlap. [Diagram 25] 2 is a diagram showing a slot configuration used in a wireless communication system according to an embodiment of the present invention. [Figure 26] A diagram showing that a terminal-specific PDCCH indicates scheduled resources to a terminal in a wireless communication system according to an embodiment of the present invention. [Figure 27]1 is a diagram showing a wireless communication system according to an embodiment of the present invention in which a base station transmits two RIVs to a terminal to indicate a scheduled time-frequency resource region to the terminal. [Figure 28] 1 is a diagram showing a wireless communication system according to an embodiment of the present invention in which a base station transmits two RIVs to a terminal to indicate a scheduled time-frequency resource region to the terminal. [Figure 29] FIG. 11 is a diagram showing an OFDM symbol corresponding to a physical data channel scheduled to a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention. [Diagram 30] FIG. 11 is a diagram showing an OFDM symbol corresponding to a physical data channel scheduled to a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention. [Diagram 31] FIG. 11 is a diagram showing an OFDM symbol corresponding to a physical data channel scheduled to a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention. [Diagram 32] FIG. 11 is a diagram showing an OFDM symbol corresponding to a physical data channel scheduled to a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention. [Diagram 33] FIG. 11 is a diagram showing an OFDM symbol corresponding to a physical data channel scheduled to a terminal indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The terms used in this specification are selected as common terms currently widely used as much as possible in consideration of the functions in the present invention, but this may vary depending on the intentions, customs, or the emergence of new technologies of the engineers in this field. In addition, in certain cases, the applicant may arbitrarily select some terms, and in this case, the meaning will be described in the description of the relevant invention. Therefore, it is clear that the terms used in this specification should be analyzed based on the substantial meaning of the terms and the contents of this specification as a whole, rather than simply the names of the terms.

[0035] Throughout the specification, when a certain component is "connected" to another component, this includes not only "direct connection" but also "electrical connection" through other components in between. Furthermore, when a certain component is "included" in a certain component, this does not mean excluding other components, but further includes other components, unless otherwise specified to the contrary. In addition, limitations such as "more than" or "less than" based on a specific threshold may be appropriately replaced with "more than" or "less than", respectively, depending on the embodiment.

[0036] The following technologies are used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA is implemented in radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA is implemented in radio technologies such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rates for GSM Evolution (EDGE). OFDMA is implemented in radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, Evolved UTRA (E-UTRA), etc. UTRA is a part of the Universal Mobile Telecommunication System (UMTS). 3GPP LTE (Long term evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A, and is a system for supporting eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. For clarity of explanation, the following description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0037] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a wireless communication system.

[0038] Referring to FIG. 1, the radio frame used in the 3GPP NR system is 10 ms (Δf max N f / 100)*T c ) and the radio frame consists of 10 equally sized subframes (SF). Here, Δf max =480*10 3 Hz, N f =4096, T c =1 / (Δf ref *N f,ref ), Δf ref =15*10 3 Hz, N f,ref = 2048. The 10 subframes in one frame are numbered 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*2 μ kHz. μ is the subcarrier spacing configuration, and μ has a value of 0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. A subframe of 1 ms length is 2 μ Each slot has a length of 2 -μ ms. μ The slots range from 0 to 2 μ The slots in a radio frame are numbered from 0 to 10*2. μThe time resources are assigned numbers up to -1. The time resources are divided by at least one of a radio frame number (also called a radio frame index), a subframe number (also called a subframe index), and a slot number (or a slot index).

[0039] FIG2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system, and in particular, illustrates a resource grid structure in a 3GPP NR system.

[0040] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes multiple OFDM symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol period. Unless otherwise specified, an OFDM symbol is simply called a symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Referring to FIG. 2, the signal transmitted from each slot is N size、μ grid、x *N RB SC subcarriers and N slot symb It is represented by a resource lattice consisting of OFDM symbols, where x=DL for the downlink resource lattice and x=UL for the uplink resource lattice. size、μ grid、x indicates the number of resource blocks (RBs) according to the subcarrier spacing factor μ (x is DL or UL), and N slot symb N denotes the number of OFDM symbols in a slot. RB SC is the number of subcarriers that make up one RB, and N RB SC= 12. Depending on the multiple access method, the OFDM symbol is called a cyclic prefix OFDM symbol (CP-OFDM) symbol or a discrete Fourier transform spread OFDM symbol (DFT-S-OFDM).

[0041] The number of OFDM symbols included in one slot may vary depending on the length of the cyclic prefix (CP). For example, if a normal CP is used, one slot includes 14 OFDM symbols, whereas if an extended CP is used, one slot includes 12 OFDM symbols. In a specific embodiment, the extended CP is used only with a subcarrier spacing of 60 kHz. For convenience of explanation, FIG. 2 illustrates a case where one slot includes 14 OFDM symbols, but the embodiment of the present invention is also applicable in the same manner to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol is represented by N size、μ grid、x *N RB SC It includes subcarriers. The subcarriers are classified into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0042] One RB is N RB SC A RB is defined by N (e.g., 12) consecutive subcarriers. Incidentally, a resource consisting of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is N slot symb *N RB SC Each resource element in the resource lattice is uniquely defined by an index pair (k, l) within one slot, where k runs from 0 to N in the frequency domain. size、μgrid、x *N RB SC is an index given from -1 to l in the time domain from 0 to N slot symb This is an index up to -1.

[0043] 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, because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters required to demodulate DL signals and transmit UL signals at the correct time.

[0044] Each symbol of a radio frame operating in time division duplex (TDD) or unpaired spectrum consists of at least one of downlink symbol (DL symbol), uplink symbol (UL symbol) or flexible symbol. A radio frame operating in frequency division duplex (FDD) or paired spectrum with a downlink carrier consists of downlink symbols or flexible symbols, and a radio frame operating with an uplink carrier consists of uplink symbols or flexible symbols. A downlink symbol allows downlink transmission but not uplink transmission, and an uplink symbol allows uplink transmission but not downlink transmission. Whether a flexible symbol is used in the downlink or uplink is determined depending on the signal.

[0045] 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 of the slot immediately following the slot having only downlink symbols, iv) the number of slots having only uplink symbols from the end of the period of the cell-specific slot configuration, and v) the number of uplink symbols from the last symbol of the slot immediately preceding the slot having only uplink symbols. Here, a symbol that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0046] If the information regarding the symbol type consists of a UE-specific RRC signal, the base station signals whether the flexible symbol is a downlink symbol or an uplink symbol using the cell-specific RRC signal. At this time, the UE-specific RRC signal cannot change a downlink symbol or an uplink symbol consisting 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 N slot symb symbols of the corresponding slot and the number of uplink symbols among the N slot symb symbols of the corresponding 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. Further, 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.

[0047] The type of symbols consisting of the RRC signal is called a semi-static DL / UL configuration. In the semi-static DL / UL configuration consisting of the RRC signal, the flexible symbol is designated as a downlink symbol, an uplink symbol, or a flexible symbol through dynamic slot format information (SFI) transmitted on a physical downlink control channel (PDCCH). In this case, the downlink symbol or the uplink symbol consisting of the RRC signal is not changed to another symbol type. Table 1 shows an example of dynamic SFI designated by the base station to the terminal.

[0048] [Table 1]

[0049] In Table 1, D indicates a downlink symbol, U indicates an uplink symbol, and X indicates a flexible symbol. As shown in Table 1, up to two DL / UL switchings are allowed in one slot.

[0050] FIG. 3 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a general signal transmission method using the corresponding physical channels.

[0051] When a terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation S101. More specifically, the terminal synchronizes with a base station in the initial cell search. To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Next, the terminal receives a physical broadcast channel from the base station to acquire broadcast information within the cell.

[0052] After completing the initial cell search, the terminal receives a physical downlink shared channel (PDSCH) through a physical downlink control channel (PDCCH) and information carried on the PDCCH to obtain more detailed system information than the system information obtained through the initial cell search S102. Here, the system information transmitted to the terminal is cell-common system information for the terminal to operate correctly in a physical layer in RRC, and is called remaining system information or system information block (SIB) 1.

[0053] When the terminal first accesses the base station or there are no radio resources for signal transmission (if the terminal is in RRC_IDLE mode), the terminal performs a random access procedure to the base station (S103 to S106). First, the terminal transmits a preamble via a physical random access channel (PRACH) (S103) and receives a response message to the preamble from the base station via a PDCCH and a corresponding PDSCH (S104). If the terminal receives a valid random access response message, the terminal transmits data including its own identifier, etc. to the base station via a physical uplink shared channel (PUSCH) indicated from an uplink grant transmitted from the base station via the PDCCH (S105). Next, the terminal waits to receive a PDCCH as an instruction from the base station to resolve collisions. If the terminal successfully receives the PDCCH via its own identifier (S106), the random access procedure is terminated. During the random access procedure, the terminal obtains terminal-specific system information required for the terminal to operate correctly in the physical layer in the RRC layer. If the terminal acquires terminal-specific system information from the RRC layer, the terminal enters the RRC connected mode (RRC_CONNECTED mode).

[0054] The RRC layer is used to generate and manage messages for control between a terminal and a radio access network (RAN). More specifically, the base station and the terminal perform storage management including broadcasting cell system information required for all terminals in the cell, delivery management of paging messages, mobility management and handover, terminal measurement reports and control therefor, terminal capability management and machine management in the RRC layer. In general, the update of a signal transmitted in the RRC layer (hereinafter, RRC signal) is longer than the transmission and reception period (i.e., transmission time interval, TTI) in the physical layer, so the RRC signal is maintained unchanged for a long period.

[0055] After the above-mentioned procedure, the terminal receives PDCCH / PDSCH S107 and transmits physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) S108 as a general uplink / downlink signal transmission procedure. In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. The format of the DCI may differ depending on the purpose of use. The uplink control information (UCI) transmitted by the terminal to the base station via the uplink includes downlink / uplink ACK / NACK signals, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI are included in channel state information (CSI). In the case of a 3GPP NR system, the terminal transmits control information such as the above-mentioned HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0056] FIG. 4 is a diagram illustrating SS / PBCH blocks for initial cell access in a 3GPP NR system.

[0057] When a terminal is powered on or attempts to access a new cell, the terminal acquires time and frequency synchronization with the cell and performs an initial cell search process. In the cell search process, the terminal obtains a physical cell identity N cell ID To this end, the terminal receives synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station to synchronize with the base station. At this time, the terminal obtains information such as a cell identity (ID).

[0058] With reference to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into PSS and SSS. The PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization and slot synchronization. The SSS is used to obtain frame synchronization and cell group ID. With reference to FIG. 4(a) and Table 2, the SS / PBCH block consists of 20 consecutive RBs (=240 subcarriers) on the frequency axis and 4 consecutive OFDM symbols on the time axis. In this case, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol and the SSS is transmitted in the third OFDM symbol via the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, i.e., the 0th to 55th and 183rd to 239th subcarriers. In addition, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals via subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) via the remaining REs in the SS / PBCH block excluding the above-mentioned signals.

[0059] [Table 2]

[0060] The SS is grouped into 336 physical-layer cell-identifier groups, each of which contains three unique identifiers, so that each physical-layer cell-identifier is part of only one physical-layer cell-identifier group, with a total of 1008 unique physical-layer cell-identifiers through the combination of three PSSs and SSSs. cell ID =3N (1) ID +N (2) ID is an index N in the range from 0 to 335 that indicates a physical-layer cell-identifier group. (1) ID and an index N from 0 to 2 indicating a physical-layer identifier within the physical-layer cell-identifier group. (2) ID The UE detects the PSS and identifies one of three unique physical-layer identifiers. The UE also detects the SSS and identifies one of 336 physical layer cell IDs associated with the physical-layer identifier. In this case, the sequence d of the PSS PSS (n) is as follows:

[0061]

number

number

number

[0062] Also, the sequence of SSS SSS (n) is as follows:

[0063]

number

number

number

[0064] A radio frame with a length of 10 ms is divided into two half frames with a length of 5 ms. The slots in each half frame in which the SS / PBCH block is transmitted will be described with reference to FIG. 4(b). The slots in which the SS / PBCH block is transmitted are any 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*nth symbol. In this case, n=0, 1 for carrier frequencies below 3 GHz. Also, n=0, 1, 2, 3 for carrier frequencies above 3 GHz and below 6 GHz. In case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*nth symbol. In this case, n=0 for carrier frequencies below 3 GHz. Also, n=0, 1 for carrier frequencies above 3 GHz and below 6 GHz. In case C, the subcarrier spacing is 30 kHz and the start of the SS / PBCH block is {2, 8}+14*n symbols, where n=0, 1 for carrier frequencies below 3 GHz. Also, n=0, 1, 2, 3 for carrier frequencies above 3 GHz and below 6 GHz. In case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is {4, 8, 16, 20}+28*n symbols, where n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz. In case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is {8, 12, 16, 20, 32, 36, 40, 44}+56*n symbols. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies of 6 GHz or higher.

[0065] FIG. 5 is a diagram showing a procedure for transmitting control information and a control channel in a 3GPP NR system. Referring to FIG. 5(a), a base station adds a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., DCI) S202. The base station scrambles the CRC with an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more terminals includes at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). Also, the terminal-specific RNTI includes at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Next, the base station performs channel encoding (e.g., polar coding) S204, and then performs rate-matching according to the amount of resource(s) used for PDCCH transmission S206. Next, the base station multiplexes DCI(s) based on a PDCCH structure based on CCE (control channel element) S208. The base station also applies additional processes S210, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI(s), and maps it to resources to be transmitted. A CCE is a basic resource unit for a PDCCH, and one CCE consists of a plurality of (e.g., 6) resource element groups (REGs). One REG consists of a plurality of (e.g., 12) REs. The number of CCEs used for one PDCCH is defined as an aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 are used. FIG. 5(b) is a diagram relating to CCE aggregation levels and multiplexing of PDCCHs, showing the types of CCE aggregation levels used for one PDCCH and the CCE(s) transmitted in the control region accordingly.

[0066] FIG. 6 is a diagram showing a CORESET in which a PDCCH is transmitted in a 3GPP NR system.

[0067] A CORESET is a time-frequency resource in which a PDCCH, which is a control signal for a terminal, is transmitted. A search space, which will be described later, is mapped to one CORESET. Thus, a terminal does not monitor all frequency bands to receive a PDCCH, but monitors a time-frequency region designated as a CORESET and decodes a PDCCH mapped to the CORESET. A base station configures one or more CORESETs for a terminal for each cell. A CORESET is made up of up to three consecutive symbols on the time axis. Also, a CORESET is made up of six units of consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET#1 is made up of consecutive PRBs, and CORESET#2 and CORESET#3 are made up of discontinuous PRBs. A CORESET may be located at any symbol in a slot. For example, in the embodiment of FIG. 5, CORESET#1 starts from the first symbol of a slot, CORESET#2 starts from the fifth symbol of a slot, and CORESET#9 starts from the ninth symbol of a slot.

[0068] FIG. 7 is a diagram illustrating a method for setting a PDCCH search space in a 3GPP NR system.

[0069] In order to transmit a PDCCH to a terminal, at least one search space exists in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) in which the PDCCH of the terminal is transmitted. The search space includes a common search space that 3GPP NR terminals should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in a cell belonging to the same base station monitor a PDCCH that is set to be commonly searched. In addition, the terminal-specific search space is set for each terminal so that the PDCCH allocated to each terminal is monitored at a different search space position according to the terminal. In the case of the terminal-specific search space, the search spaces between terminals may be partially overlapped due to the limited control region to which the PDCCH is allocated. Monitoring the PDCCH includes blind decoding the PDCCH candidates in the search space. If blind decoding is successful, it is expressed as the PDCCH being (successfully) detected / received, and if blind decoding is unsuccessful, it is expressed as the PDCCH being undetected / not received or not successfully detected / received.

[0070] For convenience of explanation, a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals to transmit downlink control information to one or more terminals is referred to as a group common (GC) PDCCH or a common PDCCH. Also, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal to transmit uplink scheduling information or downlink scheduling information to one specific terminal is referred to as a terminal-specific PDCCH. The common PDCCH is included in a common search space, and the terminal-specific PDCCH is included in a common search space or a terminal-specific PDCCH.

[0071] The base station notifies each terminal or terminal group of information on resource allocation of transmission channels, paging channel (PCH) and downlink-shared channel (DL-SCH) (i.e., DL Grant) or information on resource allocation of uplink-shared channel (UL-SCH) and hybrid automatic repeat request (HARQ) (i.e., UL Grant) via the PDCCH. The base station transmits PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station transmits data excluding specific control information or specific service data via the PDSCH. In addition, the terminal receives data excluding specific control information or specific service data via the PDSCH.

[0072] The base station transmits information on which terminal (one or more terminals) the PDSCH data is transmitted to and how the corresponding terminal should receive and decode the PDSCH data by including it in the PDCCH. For example, assume that the DCI transmitted through a specific PDCCH is CRC masked with RNTI "A", the DCI indicates that the PDSCH is allocated to radio resource "B" (e.g., frequency position) and indicates transmission format information "C" (e.g., transmission block size, modulation method, coding information, etc.). The terminal monitors the PDCCH using its own RNTI information. In this case, if there is a terminal that blindly decodes the PDCCH using RNTI "A", the corresponding terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" through the received PDCCH information.

[0073] Table 3 shows one embodiment of a PUCCH used in a wireless communication system.

[0074] [Table 3]

[0075] The PUCCH is used to transmit the following uplink control information (UCI):

[0076] -SR (Scheduling Request): Information used to request uplink UL-SCH resources.

[0077] -HARQ-ACK: a response to a PDCCH (indicating DL SPS release) and / or a response to an uplink transport block (TB) on a PDSCH. HARQ-ACK indicates whether information transmitted via a PDCCH or a PDSCH has been received. HARQ-ACK responses include a positive ACK (simply, ACK), a negative ACK (hereinafter, NACK), a discontinuous transmission (DTX), or a NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, an ACK is represented by a bit value of 1, and a NACK is represented by a bit value of 0.

[0078] -CSI: Feedback information for a downlink channel. It is generated by a terminal based on a CSI-RS (Reference Signal) transmitted by a 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.

[0079] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios and various channel environments and frame structures.

[0080] PUCCH format 0 is a format that transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis. If PUCCH format 0 is transmitted through two OFDM symbols, the same sequence is transmitted in two symbols with different RBs. In this case, the sequence is a cyclic shifted (CS) sequence from the base sequence used for PUCCH format 0. Through this, the terminal obtains frequency diversity gain. For more information, the terminal bit Bit UCI(M bit =1 or 2) to set the cyclic shift (CS) value m cs Also, the base sequence of length 12 is determined by the determined CS value m cs The cyclically shifted sequence based on the cyclic shift is mapped to 12 REs of one OFDM symbol and one RB for transmission. The number of cyclic shifts available to the terminal is 12, and M bit If =1, then 1-bit UCI0 and 1 are mapped to two cyclically shifted sequences whose cyclic shift difference is 6. Also, M bit = 2, then the 2 bits UCI 00, 01, 11, 10 are mapped to four cyclic shifted sequences with a cyclic shift value difference of 3.

[0081] PUCCH format 1 carries 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. bit The UCI, where M = 1, is modulated by BPSK. bitThe UCI, where d(0) is a 12-bit integer multiplexed (UCI), is modulated by quadrature phase shift keying (QPSK). A signal is obtained by multiplying the modulated complex valued symbol d(0) with a sequence of length 12. In this case, the sequence is the base sequence used for PUCCH format 0. The terminal transmits the obtained signal by spreading it with a time-domain orthogonal cover code (OCC) on the even-numbered OFDM symbols to which PUCCH format 1 is assigned. In PUCCH format 1, the maximum number of different terminals that can be multiplexed in the same RB is determined according to the length of the OCC used. A demodulation reference signal (DMRS) is mapped to odd-numbered OFDM symbols in PUCCH format 1 by spreading it with OCC.

[0082] PUCCH format 2 carries UCI exceeding 2 bits. PUCCH format 2 is transmitted using one or two OFDM symbols in the time axis and one or multiple RBs in the frequency axis. If PUCCH format 2 is transmitted using two OFDM symbols, the same sequence is transmitted using different RBs through the two OFDM symbols. Here, the sequence is represented by multiple modulated complex symbols d(0), ..., d(M symbol -1), where M symbol is M bit / 2. Through this, the terminal obtains frequency diversity gain. bit Bit UCI(M bit >2) is bit-level scrambled, QPSK modulated, and mapped to the RBs of one or two OFDM symbol(s), where the number of RBs is one from 1 to 16.

[0083] PUCCH format 3 or PUCCH format 4 carries UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted through continuous OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. bit Bit UCI(M bit >2) is modulated with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(M symb -1), where M symb =M bit When QPSK is used, symb =M bit / 2. The terminal does not apply block-wise spreading to PUCCH format 3. However, the terminal may apply block-wise spreading to one RB (i.e., 12 subcarriers) using PreDFT-OCC of length-12 so that PUCCH format 4 has a multiplexing capacity of two or four. The terminal transmits the spread signal by transmit precoding (or DFT-precoding), mapping it to each RE, and transmitting the spread signal.

[0084] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via 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.

[0085] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped is configured via RRC signaling. If PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor(N / 2) OFDM symbols and the second hop has ceil(N / 2) OFDM symbols.

[0086] PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted is configured by an RRC signal. The repeatedly transmitted PUCCH should start from the same OFDM symbol position in each slot and have the same length. If the RRC signal indicates that any one of the OFDM symbols in the slot in which the UE should transmit the PUCCH is a DL symbol, the UE does not transmit the PUCCH from the corresponding slot, but postpones it to the next slot for transmission.

[0087] Meanwhile, in a 3GPP NR system, a terminal transmits and receives using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal is configured with a BWP (bandwidth part) consisting of a continuous bandwidth that is a part of the carrier bandwidth. A terminal operating according to TDD or in an unpaired spectrum is configured with up to four DL / UL BWP pairs for one carrier (or cell). The terminal also activates one DL / UL BWP pair. A terminal operating according to FDD or in a paired spectrum is configured with up to four DL BWPs for a downlink carrier (or cell) and up to four UL BWPs for an 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 an active BWP.

[0088] The base station indicates an activated BWP among the BWPs configured for the terminal through a DCI. The BWP indicated through the DCI is activated, and the other configured BWP(s) are deactivated. In a carrier (or cell) operating in TDD, the base station includes a BPI (bandwidth part indicator) indicating the activated BWP in the DCI for scheduling the PDSCH or PUSCH to change the DL / UL BWP pair of the terminal. The terminal receives the DCI for scheduling the PDSCH or PUSCH and identifies the activated DL / UL BWP pair based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI for scheduling the PDSCH 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 for scheduling the PDSCH to change the UL BWP of the terminal.

[0089] FIG. 8 is a conceptual diagram illustrating carrier aggregation.

[0090] Carrier aggregation refers to a method in which a terminal uses multiple frequency blocks or (logical) cells consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers) in one large logical frequency band so that a wireless communication system can use a wider frequency band. One component carrier is called PCell (Primary cell), SCell (Secondary Cell), or PSCell (Primary SCell). However, in the following description, the term component carrier will be used for convenience of explanation.

[0091] Referring to FIG. 8, as an example of a 3GPP NR system, the entire system band includes up to 16 component carriers, and each component carrier has a bandwidth of up to 400 MHz. The component carrier includes one or more physically contiguous subcarriers. Although each component carrier is shown to have the same bandwidth in FIG. 8, this is merely an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown to be adjacent to each other on the frequency axis, the drawing is a logical concept, and each component carrier may be physically adjacent to each other or separated from each other.

[0092] A different center frequency is used in each component carrier. Also, a common center frequency is used in physically adjacent component carriers. In the embodiment of FIG. 8, if it is assumed that all component carriers are physically adjacent, center frequency A is used in all component carriers. Also, if it is assumed that each component carrier is not physically adjacent, center frequency A and center frequency B are used in each component carrier.

[0093] When the entire system band is expanded by carrier aggregation, the frequency band used for communication with each terminal is defined in component carrier units. Terminal A uses the entire system band of 100 MHz and communicates using all five component carriers. Terminals B1 to B5 use only a 20 MHz bandwidth and communicate using one component carrier. Terminals C1 and C2 use only a 40 MHz bandwidth and communicate using two component carriers each. The two component carriers may be logically / physically adjacent or not adjacent. The embodiment of FIG. 8 shows a case where terminal C1 uses two non-adjacent component carriers and terminal C2 uses two adjacent component carriers.

[0094] 9 is a diagram for explaining terminal carrier communication and multi-carrier communication. In particular, FIG. 9(a) shows a subframe structure of a single carrier, and FIG. 9(b) shows a subframe structure of a multi-carrier.

[0095] Referring to FIG. 9(a), a general wireless communication system transmits or receives data through one DL band and one corresponding UL band in the FDD mode. In another specific embodiment, in the TDD mode, the wireless communication system divides a wireless frame into an uplink time unit and a downlink time unit in the time domain, and transmits or receives data through the uplink / downlink time unit. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) are aggregated in the UL and DL, respectively, to support a bandwidth of 60 MHz. The CCs are adjacent or non-adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case in which the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical for convenience, the bandwidth of each CC may be determined independently. Also, asymmetric carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible. The DL / UL CC allocated / configured to a specific terminal through RRC is called a serving DL / UL CC of the specific terminal.

[0096] The base station activates some or all of the serving CCs of the terminal, or deactivates some of the CCs to communicate with the terminal. The base station may change the CCs to be activated / deactivated, or may change the number of CCs to be activated / deactivated. When the base station allocates CCs available to the terminal in a cell-specific or terminal-specific manner, at least one of the CCs once allocated may not be deactivated unless the CC allocation for the terminal is completely reconfigured or the terminal is handed over. A CC that is not deactivated by the terminal is called a primary CC (PCC) or PCell (primary cell), and a CC that the base station can activate / deactivate freely is called a secondary CC (SCC) or SCell (secondary cell).

[0097] Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink and uplink resources, i.e., a combination of DL CC and UL CC. A cell consists of DL resources alone or a combination of DL and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of DL resources (or DL ​​CC) and the carrier frequency of UL resources (or UL CC) is indicated by system information. Carrier frequency means the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to a SCC is called a SCell. A carrier corresponding to a PCell in the downlink is a DL PCC, and a carrier corresponding to a PCell in the uplink is a UL PCC. Similarly, a carrier corresponding to a SCell in the downlink is a DL SCC, and a carrier corresponding to a SCell in the uplink is a UL SCC. Depending on the terminal capacity, a serving cell(s) consists of one PCell and zero or more SCells. For a UE in RRC_CONNECTED state but with no carrier aggregation configured or that does not support carrier aggregation, there is only one serving cell consisting of only a PCell.

[0098] As described above, the term cell used in carrier aggregation is different from the term cell referring to a certain geographical area in which a communication service is provided by one base station or one antenna group. That is, one component carrier is referred to as a scheduling cell, scheduled cell, PCell, SCell, or PSCell. However, in order to distinguish between a cell referring to a certain geographical area and a cell of carrier aggregation, in the present invention, a cell of carrier aggregation is referred to as a CC, and a cell of a geographical area is referred to as a cell.

[0099] FIG. 10 is a diagram showing an example in which a cross-carrier scheduling technique is applied. If cross-carrier scheduling is configured, a control channel transmitted through a first CC schedules a data channel transmitted through a first CC or a second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted from a PDCCH region of the scheduling cell schedules a PDSCH / PUSCH of a scheduled cell. That is, a search region for a plurality of component carriers is the PDCCH region of the scheduling cell. A PCell is basically a scheduling cell, and a specific SCell is designated as a scheduling cell by a higher layer.

[0100] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCC (or SCell). It is also assumed that DL PCC is configured as PDCCH monitoring CC. If cross-carrier scheduling is not configured by terminal-specific (or terminal-group-specific, or cell-specific) higher layer signaling, CIF is disabled, and each DL CC transmits only PDCCH that schedules its own PDSCH without CIF according to NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, if cross-carrier scheduling is configured by UE-specific (or UE-group-specific, or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., DL PCC) transmits not only a PDCCH for scheduling the PDSCH of DL CC A but also a PDCCH for scheduling the PDSCH of other CCs using the CIF (cross-carrier scheduling). On the other hand, no PDCCH is transmitted in other DL CCs. Thus, depending on whether cross-carrier scheduling is configured in the terminal, the terminal monitors a PDCCH that does not include a CIF to receive a self-carrier scheduled PDSCH, or monitors a PDCCH that includes a CIF to receive a cross-carrier scheduled PDSCH.

[0101] 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, the same or similar configuration can be applied to the 3GPP NR system, however, in the 3GPP NR system, the subframes in FIG. 9 and 10 are switched to slots.

[0102] FIG. 11 is a block diagram illustrating the configuration of a terminal and a base station according to an embodiment of the present disclosure. In the embodiment of the present disclosure, the terminal is embodied as various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal is referred to as User Equipment (UE), Station (STA), Mobile Subscriber (MS), etc. In addition, in the embodiment of the present disclosure, the base station controls and manages cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area, and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station is referred to as next generation NodeB (gNB) or Access Point (AP), etc.

[0103] As shown, a terminal 100 according to one embodiment of the present disclosure includes a processor 110 , a communication module 120 , a memory 130 , a user interface 140 , and a display unit 150 .

[0104] First, the processor 110 executes various commands or programs to process data within the terminal 100. The processor 110 also controls the overall operation of the terminal 100 including each unit, and controls 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 disclosure. For example, the processor 110 may receive slot configuration information, determine a slot configuration based thereon, and perform communication according to the determined slot configuration.

[0105] Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. In the drawings, the communication module 120 is illustrated as an integrated module, but each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0106] The cellular communication interface card 121 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides a cellular communication service in a first frequency band based on instructions from the processor 110. According to an embodiment, the cellular communication interface card 121 includes at least one NIC module that utilizes a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 121 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of the frequency band below 6 GHz supported by the corresponding NIC module.

[0107] The cellular communication interface card 122 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides a cellular communication service in the second frequency band based on instructions from 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. The at least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the corresponding NIC module.

[0108] The unlicensed band communication interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, the external device, and the server through the third frequency band, which is an unlicensed band, and provides communication services of the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 performs wireless communication with at least one of the base station 200, the external device, and the server, independently or dependently, according to the unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0109] Next, the memory 130 stores a control program and various data associated therewith used by the terminal 100. Such a control program includes a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0110] Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. Also, the user interface 140 performs output based on a command from the processor 110 using various output means.

[0111] Then, the display unit 150 outputs various images on a display screen. The display unit 150 outputs various display objects, such as a user interface, based on the contents executed by the processor 110 or the control instructions of the processor 110.

[0112] The base station 200 according to the embodiment of the present disclosure also includes a processor 210 , a communication module 220 , and a memory 230 .

[0113] First, the processor 210 executes various commands or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200 including each unit, and controls 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 disclosure. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

[0114] Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, either built-in or external. In the drawings, the communication module 220 is illustrated as an integrated module, but the network interface cards may be independently arranged depending on the circuit configuration or application, unlike the drawings.

[0115] The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, the external device, and the server via 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 an embodiment, the cellular communication interface card 221 includes at least one NIC module that utilizes a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, the external device, and the server according to a cellular communication standard or protocol of the frequency band below 6 GHz supported by the corresponding NIC module.

[0116] The cellular communication interface card 222 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server via a mobile communication network, and provides a cellular communication service in the second frequency band based on instructions from the processor 210. According to an embodiment, the cellular communication interface card 222 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. The at least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the corresponding NIC module.

[0117] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server through the third frequency band, which is an unlicensed band, and provides communication services of the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 performs wireless communication with at least one of the terminal 100, an external device, and a server, independently or dependently, according to an unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0118] The terminal 100 and base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present disclosure, and the separated blocks are illustrated by logically distinguishing the elements of the devices. Thus, the above-mentioned device elements may be mounted on one chip or multiple chips depending on the design of the device. Also, some components of the terminal 100, such as the user interface unit 140 and the display unit 150, may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150 may be additionally provided in the base station 200 as necessary.

[0119] FIG. 12 is a diagram illustrating a resource set used in a wireless communication system according to an embodiment of the present invention.

[0120] The base station uses a resource set (RESET), which is a set of time-frequency resources that the terminal can use to receive a physical data channel. In particular, the base station uses a resource set to signal time-frequency resources that the terminal cannot use to receive a physical data channel. The terminal determines time-frequency resources corresponding to at least one RESET through an RRC signal for at least initial cell access. In a specific embodiment, the base station uses a field of DCI to indicate which RESET the terminal cannot receive a physical data channel. For convenience of explanation, a field of DCI indicating whether RESET is available to receive a physical data channel is referred to as a RESET field. If rate matching is used to receive a physical data channel, the RESET field is referred to as a rate-matching indicator. Also, if puncturing is used to receive a physical data channel, the RESET field is referred to as a puncturing indicator. The base station indicates one or more RESETs using an RRC signal. Specifically, the base station indicates time-frequency resources corresponding to RESET using an RRC signal. Also, the base station indicates whether one or more RESETs are unavailable for receiving the physical data channel using L1 signaling or DCI for scheduling the physical data channel. In this case, the base station signals the length of a DCI field for indicating whether one or more RESETs are available for receiving the physical data channel using an RRC signal. Also, depending on the RESET configuration of the base station, the RESET includes the whole or part of the above-mentioned CORESET. Specifically, the RESET is specified in units of CORESET. For example, the RESET may be specified in units of a single CORESET or multiple CORESETs.

[0121] The terminal receives the physical data channel based on the time-frequency resource where the time-frequency resource where the terminal is scheduled to receive the physical data channel overlaps with the time-frequency resource corresponding to RESET indicated as unavailable for receiving the physical data channel. At this time, the time-frequency resource where the terminal is scheduled to receive the physical data channel indicates the time-frequency resource where the terminal is scheduled to receive the physical data channel by the DCI of the physical control channel. In detail, the DCI for scheduling the physical data channel indicates the time-frequency resource where the terminal is scheduled to receive the physical data channel through the time domain information and frequency domain information of the time-frequency resource where the terminal is scheduled to receive the physical data channel. At this time, the time domain information includes an index of the start OFDM symbol of the slot where the terminal is scheduled to receive the physical data channel. In addition, the DCI for scheduling the physical data channel indicates the time-frequency resource where the terminal is scheduled to receive the physical data channel using information indicating the frequency band where the terminal is scheduled to receive the physical data channel. At this time, the information indicating the frequency band where the terminal is scheduled to receive the physical data channel is indicated in units of PRB or PRB group. In detail, the terminal determines the remaining time-frequency resources, excluding RESET indicated as unavailable for channel reception, among the time-frequency resources scheduled for receiving the physical data channel, as resources for receiving the physical data channel. The terminal determines the time-frequency resources scheduled for receiving the physical data channel of the terminal according to the DCI for scheduling the physical data channel. Through this, the terminal determines the time-frequency resources in which the time-frequency resource corresponding to RESET set with the RRC signal and the time-frequency resource scheduled for receiving the physical data channel indicated by the DCI overlap.For convenience of explanation, a time-frequency resource in which a time-frequency resource corresponding to RESET set in the terminal and a time-frequency resource scheduled for receiving a physical data channel overlap is referred to as an overlapped-resource set (overlapped-RESET). If the time-frequency resource corresponding to RESET available for receiving a physical data channel and the time-frequency resource scheduled for receiving a physical data channel do not overlap, the terminal determines that the physical data channel can be received in all the time-frequency resources scheduled for receiving the physical data channel. In particular, if the time-frequency resource corresponding to RESET available for receiving a physical data channel and the time-frequency resource scheduled for receiving a physical data channel overlap, the terminal performs rate matching based on the RESET field transmitted in the DCI that schedules the physical data channel and receives the physical data channel. In this case, the terminal performs rate matching on the time-frequency resource in which the physical data channel is scheduled, excluding the time-frequency resource corresponding to RESET in which the RESET field indicates that the physical data channel cannot be received, and receives the physical data channel. In another specific embodiment, if a time-frequency resource corresponding to RESET that cannot be used for receiving a physical data channel overlaps with a time-frequency resource scheduled for receiving a physical data channel, the terminal performs puncturing based on the RESET field. In this case, the terminal punctures the time-frequency resource corresponding to RESET, in which the RESET field indicates that the physical data channel cannot be received, among the time-frequency resources scheduled for receiving a physical data channel, and receives the physical data channel. Also, if a time-frequency resource corresponding to RESET that cannot be used for receiving a physical data channel does not overlap with a time-frequency resource scheduled for receiving a physical data channel, the terminal determines that the physical data channel can be received in all the time-frequency resources scheduled for receiving a physical data channel, regardless of the value of the RESET field.

[0122] According to the above description, the terminal is configured with time-frequency resources that cannot be used for receiving the physical data channel according to the RRC signal, and the terminal determines which of the corresponding time-frequencies indicated by the DCI are actually unavailable for receiving the physical data channel. If the base station sets the time-frequency resources that cannot be used for receiving the physical data channel only by the RRC signal, the availability of the resources changes over time, so that the resources may not always be available even if they are actually available for receiving the physical data channel. This may result in a decrease in frequency capacity (special efficiency). If the base station indicates the time-frequency resources that cannot be used for receiving the physical data channel only by the DCI, the base station must signal all information related to the time-frequency resources that cannot be used for receiving the physical data channel each time via the DCI, which may increase the overhead of the physical control channel. Therefore, according to the method of the present invention, the base station increases the frequency capacity or reduces the overhead of the physical control channel through the combination of the DCI with the RRC signal.

[0123] In the embodiment of FIG. 12, a first RESET (RESET#1) and a second RESET (RESET#2) are set in the n-th slot by an RRC signal. In the embodiment of FIG. 12(a), a part of the first RESET (RESET#1) overlaps with the time-frequency resource for which the terminal's PDSCH reception is scheduled by DCI. Therefore, the terminal determines the time-frequency resource where the first RESET (RESET#1) overlaps with the time-frequency resource for which the terminal's PDSCH reception is scheduled by DCI as an overlapping resource set. In the embodiment of FIG. 12(b), a part of the first RESET (RESET#1) overlaps with the time-frequency resource for which the terminal's PDSCH reception is scheduled by DCI. In addition, a part of the second RESET (RESET#2) overlaps with the time-frequency resource for which the terminal's PDSCH reception is scheduled by DCI. Therefore, the terminal determines the time-frequency resource in which the terminal's PDSCH reception is scheduled according to the DCI and the time-frequency resource in which the first RESET (RESET#1) and the second RESET (RESET#2) overlap, as an overlapping resource set.

[0124] The terminal cannot determine the time-frequency resource occupied by the RESET not configured in the terminal in the current slot, or can only determine it through separate signaling. In addition, it may be difficult for the terminal to determine whether the RESET configured in the terminal can receive the physical data channel in a future slot. In addition, it may be difficult for the terminal to determine the time-frequency resource occupied by the physical control channel dynamically assigned to the CORESET included in the RESET configured in the terminal in a future slot. As a result, it may be difficult for the terminal to determine the time-frequency resource in which the terminal should receive the physical data channel. Therefore, the terminal receives start symbol information indicating the position of the OFDM symbol at which the transmission of the physical data channel starts from the base station. In detail, the terminal receives the start symbol information from the base station through DCI that schedules the physical data channel. If the start symbol at which the transmission of the physical data channel starts and the position of the OFDM symbol that can be specified are K, the base station transmits the start symbol information using ceil(log2K) bits. In this case, ceil(x) indicates the smallest integer among numbers equal to or greater than x. In this case, the start symbol is specified for each slot. In addition, the terminal determines the position of the OFDM symbol where the transmission of the physical data channel starts based on the start symbol information. For example, if the OFDM symbol that can be designated as the start symbol is any one of the first to fourth OFDM symbols in the slot, the base station transmits the start symbol information using two bits of the DCI. In this case, the value of the two bits corresponding to the start symbol information of the DCI is 00. b If so, the terminal determines that the start symbol is the first OFDM symbol of the slot. Also, the value of the 2 bits corresponding to the start symbol information of the DCI is 01. b If so, the terminal determines that the start symbol is the second OFDM symbol in the slot. Also, if the value of the 2 bits corresponding to the start symbol information of the DCI is 10 b If so, the terminal determines that the start symbol is the third OFDM symbol in the slot. Also, if the value of the 2 bits corresponding to the start symbol information of the DCI is 11, bIf so, the terminal determines that the start symbol is the fourth OFDM symbol of the slot. The terminal receives a physical data channel based on the start symbol information. In particular, the terminal determines a time-frequency resource at which to start receiving a physical data channel based on the start symbol information. A method for a terminal to receive a data channel will be described with reference to Figures 13 to 24. In particular, a method for a terminal to determine a time-frequency resource at which to receive a physical data channel will be described.

[0125] FIG. 13 is a diagram illustrating a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0126] The base station determines the start symbol information to be signaled to the terminal based on RESET(s) that overlaps with the time-frequency resource in which the physical data channel is scheduled in the slot corresponding to the start symbol information. In particular, the base station determines the start symbol information based on the latest time resource (i.e., the last OFDM symbol of RESET(s)) among the time-frequency resources corresponding to RESET(s) that overlap with the time-frequency resource in which the physical data channel is scheduled in the slot corresponding to the start symbol information. In this case, the base station determines the start symbol information of the physical data channel so that the physical data channel set in the terminal does not overlap with the RESET that cannot be received based on the time-frequency resource of RESET set in the terminal through RRC configuration. If RESET does not overlap with the time-frequency resource corresponding to the frequency band in which the physical data channel is scheduled, the base station starts the physical data channel transmission from the first OFDM symbol of the corresponding frequency band. In particular, if there is a frequency band in which RESET is not set in the slot, the base station starts the physical data channel transmission from the first OFDM symbol of the corresponding frequency band. FIG. 12 shows seven OFDM symbols in the n-th slot. In the embodiment of FIG. 12, a first RESET (RESET#1) and a second RESET (RESET#2) are set in the n-th slot. In the frequency domain, the first RESET (RESET#1) overlaps with the time-frequency resource for which the terminal is scheduled to receive the PDSCH, but the second RESET (RESET#2) does not overlap. In addition, since the first RESET (RESET#1) ends in the second OFDM symbol of the n-th slot, the base station starts PDSCH transmission from the third symbol of the n-th slot. At this time, the base station sets the value of the field indicating the start symbol information of the DCI to 10. b Set to.

[0127] If at least a part of the time-frequency resource for which the terminal is scheduled to receive a physical data channel overlaps with RESET, the base station designates the OFDM symbol next to the last OFDM symbol of the RESET as a start symbol. The terminal does not expect to receive a physical data channel in an OFDM symbol corresponding to RESET in which the terminal is unable to receive a physical data channel set in the terminal. Also, the terminal expects to receive a physical data channel from the OFDM symbol next to the last OFDM symbol of RESET in which the terminal is unable to receive a physical data channel set in the terminal. In particular, the terminal receives a physical data channel from the OFDM symbol next to the last OFDM symbol of RESET in which the terminal is unable to receive a physical data channel set in the terminal.

[0128] In this embodiment, even if the time-frequency resource is not used for other purposes, it may not be available for transmitting the physical data channel. In order to maximize the use of the time-frequency resource, the terminal distinguishes between a frequency band that overlaps with RESET, which is scheduled for receiving the physical data channel of the terminal, and a band that does not overlap with RESET, which is scheduled for receiving the physical data channel of the terminal, and a band that does not overlap with RESET, which is scheduled for receiving the physical data channel of the terminal, and determines a start time of receiving the physical data channel. In addition, the base station designates start symbol information based on the last OFDM symbol of the OFDM symbols corresponding to RESET(s) not set to the terminal. This will be described with reference to FIG. 14.

[0129] FIG. 14 is a diagram illustrating a time-frequency resource region in which a PDSCH is transmitted in a wireless communication system according to an embodiment of the present invention.

[0130] As described above, the terminal determines the start time of receiving the physical data channel by distinguishing between a frequency band overlapping with RESET where the physical data channel set for the terminal cannot be received and a frequency band not overlapping with RESET set for the terminal among the frequency bands scheduled for receiving the physical data channel of the terminal. In addition, the base station designates start symbol information based on the last OFDM symbol among the OFDM symbols corresponding to RESET(s) not set for the terminal. In detail, the base station designates the OFDM symbol next to the last OFDM symbol among the OFDM symbols corresponding to RESET(s) not set for the terminal as the start symbol. In a specific embodiment, in a frequency band overlapping with RESET where the physical data channel set for the terminal cannot be received among the frequency bands scheduled for receiving the physical data channel of the terminal, the terminal expects to receive the physical data channel from the next OFDM symbol of the last OFDM symbol of RESET where the physical data channel set for the terminal cannot be received. In addition, in a frequency band in which reception of a physical data channel is scheduled and does not overlap with a RESET in which reception of a physical data channel set in the terminal is not possible, the terminal expects to receive the physical data channel from an OFDM symbol indicated by the start symbol information. The reason for indicating the start symbol of the physical data channel is that the terminal can determine a RESET in which reception of a physical data channel set in the terminal is not possible, but cannot determine a RESET set in another terminal.

[0131] FIG. 14 shows seven OFDM symbols in the n-th slot. In the embodiment of FIG. 14, a first RESET (CORESET#1) and a second RESET (CORESET#2) are set in the n-th slot. In this case, the first RESET (CORESET#1) is a RESET that is set in the terminal and does not allow reception of the PDSCH, and the second RESET (RESET#2) is a RESET that is set in another terminal. The first RESET (RESET#1) in which the terminal is scheduled to receive the PDSCH is overlapped, but the second RESET (RESET#2) is not overlapped. In this case, the last OFDM symbol of the first RESET (RESET#1) is the second OFDM symbol of the n-th slot. Also, the last OFDM symbol of the second RESET (RESET#2) is the first OFDM symbol of the n-th slot. In the embodiment of FIG. 14(a), the base station designates the second OFDM symbol, which is the next OFDM symbol after the last symbol of the second RESET (RESET#2) that is not set in the terminal, as the start symbol. At this time, the value of the DCI field, which corresponds to the start symbol information, is 01. b In a frequency band in which the terminal's PDSCH reception is scheduled and which overlaps with the first RESET (RESET#1), the terminal starts PDSCH reception from the OFDM symbol next to the first OFDM symbol of the first RESET (RESET#1). Also, in a frequency band in which the terminal's PDSCH reception is scheduled and which does not overlap with the first RESET (RESET#1), the terminal starts PDSCH reception from the second OFDM symbol, which is the OFDM symbol indicated by the start symbol information.

[0132] In another specific embodiment, if the time-frequency resource for which the terminal's physical data channel reception is scheduled overlaps with a RESET(s) not set to the terminal, the base station designates the OFDM symbol next to the last OFDM symbol of the RESET(s) not set to the terminal as the start symbol. If the terminal's physical data channel reception overlaps with the scheduled time-frequency resource and there is no RESET not set to the terminal, the base station designates the first OFDM symbol of the slot as the start symbol. In the embodiment of FIG. 14(b), the terminal's PDSCH reception overlaps with a scheduled PRB and there is no RESET not set to the terminal, so the base station designates the first OFDM symbol as the start symbol. In this case, the value of the DCI field corresponding to the start symbol is 00. b In a frequency band in which the terminal's PDSCH reception is scheduled and which overlaps with the first RESET (RESET#1), the terminal starts PDSCH monitoring from the OFDM symbol next to the last OFDM symbol of the first RESET (RESET#1). In addition, in a frequency band in which the terminal's PDSCH reception is scheduled and which does not overlap with the first RESET (RESET#1), the terminal starts PDSCH reception from the first OFDM symbol, which is the OFDM symbol indicated by the start symbol information.

[0133] Only a part of the time-frequency resources corresponding to CORESET included in RESET is used for transmitting the physical data channel. In addition, the terminal determines the time-frequency resources in which the physical control channel of the terminal is transmitted among the time-frequency resources corresponding to RESET in which the physical data channel set in the terminal cannot be received. Thus, among the time-frequency resources corresponding to RESET, the frequency resources not used for transmitting the physical control channel are used for transmitting the physical data channel. In this case, the terminal assumes that the physical data channel is not transmitted in the time-frequency resources in which the physical control channel is received among the time-frequency resources corresponding to RESET in which the physical data channel set in the terminal cannot be received. The terminal performs rate matching on the remaining time-frequency resources excluding the corresponding time-frequency resources, or punctures the corresponding time-frequency resources to receive the physical data channel. This will be described with reference to FIG. 15 to FIG. 16.

[0134] 15 and 16 are diagrams illustrating a terminal of a wireless communication system receiving a PDSCH in a RESET set in the terminal according to an embodiment of the present invention.

[0135] Regardless of whether the physical data channel set in the terminal overlaps with the RESET that cannot be received, the terminal receives the physical data channel from the OFDM symbol indicated by the start symbol information in the frequency band where the reception of the physical data channel of the terminal is scheduled. In this case, if the RESET set in the terminal includes a CORESET and the terminal receives a physical control channel in the CORESET, the terminal punctures the time-frequency resource used for transmitting the physical control channel to receive the physical data channel. Also, if the RESET set in the terminal includes a CORESET and the terminal receives a physical control channel in the corresponding CORESET, the terminal performs rate matching on the remaining time-frequency resource excluding the time-frequency resource used for transmitting the corresponding physical control channel to receive the physical data channel.

[0136] 15 to 16 show seven OFDM symbols in the n-th slot. In the embodiment of FIG. 15 to 16, a first RESET (RESET#1) and a second RESET (RESET#2) are set in the n-th slot. In this case, the first RESET (RESET#1) is a RESET that is set in the terminal and does not allow reception of the PDSCH, and the second RESET (RESET#1) is a RESET set in another terminal. The first RESET (RESET#1) and a PRB for which the terminal is scheduled to receive the PDSCH overlap, but the second RESET (RESET#2) does not overlap. In this case, the last OFDM symbol of the first RESET (RESET#1) is the second OFDM symbol of the n-th slot. Also, the last OFDM symbol of the second RESET (RESET#2) is the first OFDM symbol of the n-th slot. In the embodiment of Figure 15, the terminal receives the PDSCH from the second OFDM symbol indicated by the start symbol information in the frequency band where the terminal is scheduled to receive the PDSCH. In this case, the terminal receives the PDSCH by puncturing the PRB used for transmitting the PDCCH in the RESET set in the terminal.

[0137] In another specific embodiment, the terminal receives the physical data channel from the first OFDM symbol of a frequency band overlapping with RESET, which is not capable of receiving the physical data channel set in the terminal, among the frequency bands scheduled for receiving the physical data channel. In this case, the terminal receives the physical data channel by puncturing a time-frequency resource used for transmitting the physical control channel in RESET, which is set in the terminal. Also, the terminal receives the physical data channel by performing rate matching on the remaining time-frequency resource excluding the time-frequency resource used for transmitting the physical control channel in RESET, which is set in the terminal. In the frequency bands scheduled for receiving the physical data channel, which does not overlap with RESET, which is not capable of receiving the physical data channel set in the terminal, the terminal receives the physical data channel from the OFDM symbol indicated by the start symbol information.

[0138] In the embodiment of FIG. 16, the terminal receives the PDSCH from the first OFDM symbol of a frequency band overlapping with the RESET in which the terminal is unable to receive the PDSCH set in the terminal among the frequency bands in which the terminal is scheduled to receive the PDSCH. In this case, the terminal receives the PDSCH by puncturing the PRBs used for transmitting the PDCCH in the RESET in which the terminal is unable to receive the PDSCH set in the terminal. Also, the terminal receives the PDSCH by performing rate matching on the remaining time-frequency resources excluding the PRBs used for transmitting the PDCCH in the RESET in which the terminal is unable to receive the PDSCH set in the terminal. Also, in the frequency band in which the terminal is scheduled to receive the PDSCH and does not overlap with the RESET in which the terminal is unable to receive the PDSCH set in the terminal, the terminal monitors the PDSCH from the second OFDM symbol indicated by the start symbol information.

[0139] In such an embodiment, the base station sets the start symbol according to the embodiment described with reference to FIGS.

[0140] The base station divides one slot into a plurality of frequency bands and signals a start symbol for each of the plurality of frequency bands. The base station signals a plurality of start symbol information corresponding to a plurality of start symbols through DCI. At this time, the terminal receives a physical data channel based on the plurality of start symbol information. This is because a plurality of RESET(s) are set in one slot, and the plurality of RESET(s) are set to different PRBs and OFDM symbols. At this time, the base station sets the start symbol of the corresponding frequency band based on the latest OFDM symbol among the last OFDM symbols of RESET(s) that cannot receive a physical data channel that overlaps with a time-frequency resource scheduled for receiving the physical data channel of the terminal in the corresponding frequency band. In particular, the base station sets the next OFDM symbol to the latest OFDM symbol among the last OFDM symbols of RESET(s) that cannot receive a physical data channel that overlaps with a time-frequency resource scheduled for receiving the physical data channel of the terminal in the corresponding frequency band as the start symbol of the corresponding frequency band. In this case, if there is no RESET(s) that makes it impossible to receive a physical data channel that overlaps with the time-frequency resource scheduled for reception of the terminal's physical data channel in the corresponding frequency band, the base station sets the first OFDM symbol as the start symbol of the corresponding frequency band.

[0141] Also, the terminal starts receiving the physical data channel based on the RESET in which the terminal is unable to receive the physical data channel set in the corresponding frequency band or the time-frequency resource in which the terminal is scheduled to receive the physical data channel that overlaps with the physical data channel transmitted to the terminal. In a specific embodiment, the terminal receives the physical data channel from the next OFDM symbol of the last OFDM symbol of the RESET in which the terminal is unable to receive the physical data channel set in the corresponding frequency band that overlaps with the time-frequency resource in which the terminal is scheduled to receive the physical data channel, regardless of the starting symbol of the corresponding frequency band. In another specific embodiment, the terminal receives the physical data channel from the next OFDM symbol of the last OFDM symbol of the physical control channel transmitted to the terminal that overlaps with the time-frequency resource in which the terminal is scheduled to receive the physical data channel, regardless of the starting symbol of the corresponding frequency band.

[0142] The base station transmits the physical control channel and the physical data channel scheduled by the corresponding physical control channel through different slots. This scheduling method is called cross-slot scheduling. For example, the base station transmits the physical control channel in a CORESET in the n-th slot. In this case, the physical control channel schedules the physical data channel in the (n+k)-th slot. In this case, n is a natural number, and k is a natural number greater than 1. The position of the time-frequency resource occupied by the physical control channel mapped to the CORESET configured in the terminal may differ for each slot. Whether or not the CORESET is used for the physical data channel is determined according to the physical control channel allocation of the base station, so whether or not the RESET including the corresponding CORESET is unable to receive the physical data channel may differ for each slot. Therefore, when cross-slot scheduling is performed, it may be difficult for the base station or the terminal to determine the time-frequency resource used for transmitting the physical data channel in the slot in which the physical data channel scheduled by the cross-slot scheduling is transmitted. Therefore, when cross-slot scheduling is used, a method of setting and signaling a start symbol corresponding to a physical data channel becomes an issue, which will be described with reference to FIG.

[0143] FIG. 17 is a diagram illustrating a terminal receiving a PDSCH when cross-slot scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0144] If a physical data channel is scheduled by cross-slot scheduling, the position of the start symbol is fixed to a specific OFDM symbol of a slot in which the physical data channel is transmitted. In this case, the specific OFDM symbol is set based on the last OFDM symbol of RESET set in the terminal. In particular, the specific OFDM symbol is the next OFDM symbol after the last OFDM symbol of RESET set in the terminal. For example, if the last symbol of RESET set in the terminal is the third OFDM symbol of the corresponding slot, the specific OFDM symbol is the fourth OFDM symbol. The base station signals the specific OFDM symbol through an RRC signal or periodically transmitted system information. In this case, the terminal determines a start symbol corresponding to a physical data channel scheduled by cross-slot scheduling based on the RRC signal or the system information. In addition, the start symbol corresponding to a physical data channel scheduled by cross-slot scheduling is set for each of a plurality of frequency bands. In particular, the start symbol corresponding to a physical data channel scheduled by cross-slot scheduling is set for each PRB or for each specific number of consecutive PRBs. In another specific embodiment, the start symbol corresponding to the physical data channel scheduled by the cross-slot scheduling is set commonly to all frequency bands of the cell, and in another specific embodiment, the base station signals the start symbol via DCI of the physical control channel that performs the cross-slot scheduling.

[0145] The terminal receives the physical data channel by performing rate matching on time-frequency resources excluding the time-frequency resources on which the physical data channel is scheduled and the time-frequency resources on which RESET overlaps from the time-frequency resources on which the physical data channel is scheduled by cross-slot scheduling. Also, the terminal receives the physical data channel by puncturing the time-frequency resources on which the physical data channel is scheduled and the time-frequency resources on which RESET overlaps from the time-frequency resources on which the physical data channel is scheduled by cross-slot scheduling. In addition, the operation of the terminal receiving the physical data channel is applied to the embodiment described previously in FIG. 17.

[0146] As described above, the DCI for scheduling the physical data channel indicates whether RESET is used for receiving the physical data channel using the RESET field. In this case, the RESET field is used for other purposes than the above purpose. In particular, if the physical data channel is scheduled by cross-slot scheduling, the RESET field indicates in which slot the physical data channel is scheduled. If the physical data channel is scheduled in a future slot by cross-slot scheduling, it is difficult for the base station to determine which RESET cannot be used in the slot in which the physical data channel is scheduled during close scheduling. If the RESET field is used for other purposes, the terminal assumes that the time-frequency resource corresponding to the configured RESET cannot be used for the physical data channel.

[0147] In the embodiment of FIG. 17, the PDCCH transmitted in the nth slot schedules the PDSCH transmitted in the n+1th slot. The position of the start symbol used when receiving the PDSCH scheduled by cross-slot scheduling in all frequency bands in the cell is the third OFDM symbol, which is the symbol next to the last symbol of RESET#1 that overlaps with the PDSCH in frequency band. Therefore, the terminal starts receiving the PDSCH from the n+1th slot to the third slot. In addition, the RESET field indicates that the PDSCH is scheduled in the n+1th slot. Therefore, the terminal starts receiving the PDSCH from the n+1th slot to the third slot.

[0148] A base station schedules PDSCHs transmitted in multiple slots using one physical control channel. Such a scheduling method is called slot-aggregation based scheduling. For example, a base station transmits a physical control channel in RESET of an n-th slot. In this case, the physical control channel schedules physical data channels in the n-th slot, the n+1-th slot, ..., the n+k-th slot. In this case, n is a natural number, and k is a natural number greater than 1. The position of the time-frequency resource occupied by the physical control channel mapped to RESET set in the terminal may differ for each slot. Therefore, when slot-aggregation based scheduling is performed, it may be difficult for a base station or a terminal to determine the time-frequency resource available for transmission of the physical data channel in the slot in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted. Therefore, when slot-aggregation based scheduling is used, a method of setting and signaling a start symbol corresponding to the physical control channel becomes an issue. This will be described with reference to FIG. 18 and FIG. 19.

[0149] 18 and 19 are diagrams illustrating a UE receiving a PDSCH when slot-binding based scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0150] If a physical data channel is scheduled in a plurality of future slots, the terminal starts receiving the physical data channel based on the position of the same OFDM symbol in the plurality of slots. In particular, if a physical data channel is scheduled by slot-binding based scheduling, the terminal starts receiving the physical data channel based on the position of the same OFDM symbol in all slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted. In particular, if a physical data channel is scheduled by slot-binding based scheduling, the position of the start symbol corresponding to all slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted is set to the same specific OFDM symbol in the slot in which the corresponding physical data channel is transmitted. In this case, the specific OFDM symbol is set based on the last OFDM symbol in which RESET may be located in each slot. In particular, the specific OFDM symbol is the next OFDM symbol of the last OFDM symbol of RESET set in the terminal. For example, if the last symbol of the set RESET is the third OFDM symbol in the corresponding slot, the specific OFDM symbol is the fourth OFDM symbol. The base station signals a specific OFDM symbol through an RRC signal or periodically transmitted system information. In this case, the terminal determines a start symbol corresponding to all slots in which physical data channels scheduled by slot-binding based scheduling are transmitted based on the RRC signal or the system information. In addition, the start symbol corresponding to all slots in which physical data channels scheduled by slot-binding based scheduling are transmitted is set for each of a plurality of frequency bands. In particular, the start symbol corresponding to all slots in which physical data channels scheduled by slot-binding based scheduling are transmitted is set for each PRB or for each specific number of consecutive PRBs.In another specific embodiment, a start symbol corresponding to all slots transmitted on a physical data channel scheduled by slot-binding based scheduling is set commonly to all frequency bands of a cell. In another specific embodiment, a base station signals a start symbol via DCI of a physical control channel performing slot-binding based scheduling.

[0151] If a physical data channel is scheduled in a plurality of future slots, the terminal receives the physical data channel with the same reset in each of the plurality of future slots. In particular, the RESET field is equally applied to all slots in which a physical data channel scheduled by slot-binding based scheduling is transmitted. In another embodiment, the DCI of a physical control channel performing slot-binding based scheduling indicates a start symbol corresponding to any one of all slots in which a physical data channel scheduled by slot-binding based scheduling is transmitted. The RESET field indicates whether RESET is available for receiving the physical data channel in any one of a plurality of slots in which a physical data channel scheduled by slot-binding based scheduling is transmitted. In this case, the one slot is a slot in which a physical control channel including DCI for scheduling the physical data channel is transmitted. If slot-binding based scheduling is used, the terminal assumes that the time-frequency resource corresponding to RESET cannot be used for receiving the physical data channel in a slot not indicated by the RESET field among slots in which a physical data channel scheduled by slot-binding based scheduling is transmitted.

[0152] In the embodiment of Figure 18, the PDCCH transmitted in the nth slot schedules the PDSCH transmitted in the nth slot and the PDSCH transmitted in the n+1th slot. The position of the start symbol used when receiving the PDSCH scheduled by slot-binding based scheduling in all frequency bands in the corresponding cell is the 3rd OFDM symbol. Therefore, the UE starts receiving the PDSCH from the 3rd slot after the nth slot and the n+1th slot.

[0153] In the above embodiment, the position of the start symbol corresponding to all slots in which the physical data channel scheduled by the slot-binding based scheduling is transmitted is the same. In another specific embodiment, the DCI of the physical control channel performing the slot-binding based scheduling indicates the start symbol corresponding to any one of all slots in which the physical data channel scheduled by the slot-binding based scheduling is transmitted. In particular, the DCI of the physical control channel performing the slot-binding based scheduling indicates the start symbol corresponding to the first slot of all slots in which the physical data channel scheduled by the slot-binding based scheduling is transmitted. In another specific embodiment, the DCI of the physical control channel performing the slot-binding based scheduling indicates the start symbol of the slot in which the physical control channel performing the slot-binding based scheduling is transmitted. In this embodiment, the start symbols of the slots in which the physical data channel in which the position of the start symbol is not indicated by the DCI of the physical control channel performing the slot-binding based scheduling is transmitted are all fixed to the same specific OFDM symbol. For convenience of explanation, the start symbols corresponding to the physical data channel in which the position of the start symbol is not indicated by the DCI of the physical control channel performing the slot-binding based scheduling are referred to as the remaining start symbols. The method of setting and signaling the position of the remaining start symbol is the same as that described in the embodiment in which the position of the start symbol corresponding to all slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted is the same. In particular, the specific OFDM symbol is set based on the last OFDM symbol of the RESET set. In particular, the specific OFDM symbol is the OFDM symbol next to the last OFDM symbol of the RESET set in the terminal. The base station signals the specific OFDM symbol through an RRC signal or system information transmitted periodically. In this case, the terminal determines the position of the remaining start symbol based on the RRC signal or the system information. In addition, the remaining start symbol is set for each of a plurality of frequency bands.In particular, the remaining start symbols are set for each PRB or for a specific number of consecutive PRBs. In another specific embodiment, the remaining start symbols are set commonly to all frequency bands of the cell.

[0154] In the embodiment of Figure 19, the PDCCH transmitted in the nth slot schedules the PDSCH transmitted in the nth slot and the PDSCH transmitted in the n+1th slot. At this time, the PDCCH indicates the start symbol of the nth slot as the first OFDM symbol. Also, the position of the start symbol used when receiving the remaining PDSCHs for which the start symbol is not indicated in the PDCCH is the second OFDM symbol. Therefore, the terminal starts monitoring the PDSCH from the first OFDM symbol in the nth slot, and starts monitoring the PDSCH from the second OFDM symbol in the n+1th slot.

[0155] In slots following the slot in which the physical control channel performing slot-binding based scheduling is transmitted, the terminal receives the physical data channel by performing rate matching on time-frequency resources obtained by excluding the time-frequency resources on which the physical data channel is scheduled and the time-frequency resources on which RESET overlaps from the time-frequency resources on which the physical data channel is scheduled according to slot-binding based scheduling. As described above, the value of the RESET field is also applied to slots following the slot in which the physical control channel performing slot-binding based scheduling is transmitted. In this case, the terminal performs rate matching on time-frequency resources obtained by excluding the time-frequency resources on which the physical data channel is scheduled and the time-frequency resources on which RESET overlaps, on which the physical data channel cannot be received, from the time-frequency resources on which the physical data channel is scheduled according to slot-binding based scheduling. In addition, in slots following the slot in which the physical control channel performing slot-binding based scheduling is transmitted, the terminal receives the physical data channel by puncturing the time-frequency resources on which RESET overlaps with the time-frequency resources on which the physical data channel is scheduled according to slot-binding based scheduling. As described above, the value of the RESET field is also applied to slots following the slot in which the physical control channel that performs slot-binding based scheduling is transmitted. In this case, the terminal punctures the time-frequency resource in which the physical data channel is scheduled and the time-frequency resource in which the reset that cannot receive the physical data channel overlaps in the time-frequency resource in which the physical data channel is scheduled according to the slot-binding based scheduling. In addition, the operation of the terminal receiving the physical data channel is applied to the embodiment described previously in FIG. 17.

[0156] The base station divides the overlapping resource set into a plurality of sub-resource sets and indicates whether each of the sub-resource sets is unavailable for receiving a physical data channel. The terminal also determines whether each of the sub-resource sets is unavailable for receiving a physical data channel. In particular, the terminal receives DCI including an N-bit field indicating N sub-resource sets from the base station. In this case, each bit of the N-bit field indicates whether each of the N sub-resource sets is unavailable for receiving a physical data channel. This will be described with reference to FIG. 20.

[0157] FIG. 20 is a diagram illustrating an example of sub-resource sets used in a wireless communication system according to an embodiment of the present invention.

[0158] As described above, the base station uses an N-bit field to indicate whether a sub-resource set is used for receiving a physical data channel. For convenience of explanation, this field is referred to as a sub-resource set bitmap. If there is one overlap resource set, the corresponding overlap resource set is divided into N sub-resource sets. In this case, each bit of the sub-resource set bitmap indicates whether each of the N sub-resource sets is available for receiving a physical data channel. If the number of overlap resource sets is less than N, each overlap resource set is set to at least one sub-resource set. If the number of overlap resource sets is greater than N, multiple overlap resource sets are set to one sub-resource set. Also, if the number of overlap resource sets is N, each of the N overlap resource sets is set to one sub-resource set.

[0159] When one overlapping resource set is configured into multiple sub-resource sets, the sub-resource sets are configured based on the time domain without being divided in the frequency domain. In this case, the sub-resource sets are configured based on the OFDM symbols that the overlapping resource sets occupy. Figure 20(a) shows an example of sub-resource sets configured based on the time domain.

[0160] In addition, when one overlap resource set is configured into a plurality of sub-resource sets, the sub-resource sets are configured based on the frequency domain without division in the time domain. In this case, the sub-resource sets are configured based on the PRBs occupied by the overlap resource set. In this case, the sub-resource sets include only consecutive PRBs. In another specific embodiment, the sub-resource sets include non-consecutive PRBs. In a specific embodiment, the overlap resource set is configured into M sub-resource sets. In this case, if the overlap resource set occupies X PRBs, M-1 sub-resource sets are configured to occupy floor(X / M) PRBs, and one sub-resource set is configured to occupy X-(M-1)*floor(X / M) PRBs. In this case, floor(x) indicates the largest natural number that is equal to or smaller than x. Figures 20(b) and 20(d) show an example of sub-resource sets configured based on the frequency domain.

[0161] In addition, when one overlapping resource set is configured into multiple sub-resource sets, the sub-resource sets are configured based on the time-frequency domain. In this case, the sub-resource sets are configured based on the OFDM symbols and PRBs that the overlapping resource sets occupy. In this case, the sub-resource sets include only consecutive PRBs. In another specific embodiment, the sub-resource sets include non-consecutive PRBs. Figures 20(c) and 20(e) show an example of sub-resource sets configured based on the time-frequency domain.

[0162] If multiple RESETs are included in an overlapping resource set, the multiple RESETs are preferentially set in the sub-resource sets, specifically, the multiple RESETs are preferentially assigned bits in the overlapping resource set bitmap.

[0163] In another specific embodiment, the base station divides the time-frequency resources scheduled for receiving the physical data channel of the terminal, regardless of the overlapping resource set, and signals whether the divided resources are available for receiving the physical data channel. In particular, the time-frequency resources scheduled for receiving the physical data channel of the terminal are divided into two evenly based on the frequency domain. N In this case, the base station uses the N-bit field of the L1 signaling or the N-bit field of the DCI to signal whether the terminal can use the N-bit field to receive the physical data channel. The terminal determines the time-frequency resources available for receiving the physical data channel based on the value of the N-bit field of the L1 signaling or the N-bit field of the DCI.

[0164] FIG. 21 is a diagram illustrating a terminal receiving a PDSCH based on an overlapping resource set in a wireless communication system according to an embodiment of the present invention.

[0165] As described above, if the sub-resource set bitmap included in the DCI for scheduling the physical data channel indicates that the PDSCH is transmitted on the sub-resource set, the terminal receives the physical data channel on the sub-resource set. If the PDCCH is received in the time-frequency domain corresponding to the sub-resource set, the terminal punctures the time-frequency domain occupied by the physical control channel to receive the physical data channel. Also, if the physical control channel is received in the time-frequency domain corresponding to the sub-resource set, the terminal performs rate matching on the remaining sub-resource sets excluding the time-frequency domain occupied by the physical control channel to receive the physical data channel. In the embodiment of FIG. 21, a first RESET (RESET#1) and a second RESET (RESET#2) are set in the n-th slot by the RRC signal. In the embodiment of FIG. 21, a part of the first RESET (RESET#1) overlaps with the time-frequency resource scheduled for the terminal's PDSCH reception by the DCI. Also, the DCI does not indicate that the first RESET (RESET#1) is not capable of receiving the PDSCH. Therefore, the terminal determines the time-frequency resource where the first RESET (RESET#1) overlaps with the time-frequency resource for which the PDSCH reception of the terminal is scheduled according to the DCI as an overlap resource set. In this case, the PDCCH is received through the time-frequency resource corresponding to the overlap resource set. The terminal receives the PDSCH by puncturing the time-frequency region occupied by the PDCCH. Also, the terminal receives the PDSCH by performing rate matching on the remaining overlap resource set excluding the time-frequency region occupied by the PDCCH.

[0166] As described above, the base station sets RESET using an RRC signal. When the base station sets RESET using an RRC signal, a method for the base station to indicate at least one time-frequency resource corresponding to RESET becomes an issue. This will be described with reference to Figures 22 to 24.

[0167] The base station signals the index of the PRB occupied by RESET and the OFDM symbol index occupied by RESET to indicate the time-frequency resource corresponding to RESET. If RESET occupies consecutive time-frequency resources, the base station indicates the consecutive time-frequency resources using one indication value. At this time, the indication value is called a resource indication value (RIV), and such an indication method is called an RIV method. More specifically, the base station generates one RIV by combining the start position of the consecutive resources and the number of consecutive resources. More specifically, if RESET occupies consecutive OFDM symbols, the base station generates an RIV using the start index of the OFDM symbol and the index of the last OFDM symbol. Also, if RESET occupies consecutive RPBs and consecutive OFDM symbols, the base station generates one RIV based on the PRB index and generates one RIV based on the OFDM symbol index. At this time, the base station transmits two RIV values. In another specific embodiment, one value is generated by encoding two RIVs. At this time, the base station transmits only one generated value to signal the time-frequency resource occupied by RESET. A method of generating an RIV will be described in detail with reference to Figures 27 to 30.

[0168] If the time-frequency resources occupied by RESET are non-contiguous, the base station signals the time-frequency resources occupied by RESET using a bitmap. In addition, when the base station signals the time-frequency resources occupied by RESET, the base station also signals the monitoring period corresponding to RESET. For example, if the monitoring period of RESET is 2 slots, the terminal determines that the corresponding RESET exists every 2 slots. In addition, when the base station signals the time-frequency resources occupied by RESET, the base station signals information about a CORESET included in RESET. The information about CORESET includes at least one of information about resource element group (REG) bundling and information about control channel element (CCE)-to-REG mapping.

[0169] The base station needs to signal a connection relationship between RESET and a bit field of L1-signaling indicating RESET. In this case, the bit field is the above-mentioned RESET field. The base station indicates a bit field index of L1-signaling corresponding to RESET, and signals a connection relationship between RESET and a bit field of L1-signaling indicating RESET. L1-signaling is a DCI for scheduling a physical data channel. Also, L1-signaling is a group-common DCI transmitted in a slot in which a physical data channel is transmitted. In a specific embodiment, the base station signals a connection relationship between RESET and a bit field of L1-signaling indicating RESET, regardless of physical data channel allocation information. For example, the RESET field is n bits. In order for the base station to signal that the i-th bit of the RESET field indicates whether RESET is unavailable for receiving physical data, the base station signals i through an RRC signal that sets the corresponding RESET. If the value of the i-th bit of the RESET field is 1, the terminal determines that the time-frequency resource corresponding to the corresponding RESET cannot be used to receive a physical data channel. If the value of the i-th bit of the RESET field is 0, the terminal determines that the time-frequency resource corresponding to the corresponding RESET is used to receive a physical data channel. The bit of the RESET field corresponding to the RESET that does not overlap with the time-frequency resource for which the physical data channel is scheduled is used for other purposes. In this case, the time-frequency resource for which the physical data channel is scheduled is indicated by the RA (Resource Allocation) field. In more detail, it indicates whether the time-frequency resource corresponding to another RESET cannot be used to receive a physical data channel. For example, the first bit of the RESET field indicates whether the physical data channel can be received in the first RESET (RESET#1) and second RESET (RESET#2), and the second bit indicates whether the physical data channel can be received in the third RESET (RESET#3) and fourth RESET (RESET#4).In this case, the first RESET (RESET#1) and the second RESET (RESET#2) overlap with the time-frequency resource for which the physical data channel is scheduled. The third RESET (RESET#3) and the fourth RESET (RESET#4) do not overlap with the time-frequency resource for which the physical data channel is scheduled. In this case, the first bit of the RESET field does not indicate whether the physical data channel is receivable in the first RESET (RESET#1) and the second RESET (RESET#2), but indicates whether the physical data channel is receivable in the first RESET (RESET#1). In addition, the second bit of the RESET field does not indicate whether the physical data channel is receivable in the third RESET (RESET#3) and the fourth RESET (RESET#4), but indicates whether the physical data channel is receivable in the second RESET (RESET#2). If all RESETs indicated by any one bit of the RESET field do not overlap with the time-frequency resource on which the physical data channel is scheduled, the corresponding bit indicates whether a specific CORESET or a RESET including a CORESET is used to receive the physical data channel.

[0170] In another specific embodiment, the base station signals a connection relationship between RESET and a bit field of L1-signaling indicating RESET based on a time-frequency resource for which a physical data channel is scheduled. For example, the base station signals time-frequency resource information corresponding to RESET to the terminal. In this case, the terminal signals the connection relationship between the overlapping resource set and the L1-signaling using an RRC signal. Alternatively, the base station implicitly signals the connection relationship between the overlapping resource set and the L1-signaling. In particular, if the overlapping resource set is divided into a plurality of sub-resource sets, each RESET(s) is identified by a different index. In this case, among the plurality of bits constituting the rate matching indicator, a bit indicating a sub-resource set is determined based on an index identifying RESET. In a specific embodiment, the terminal maps the sub-resource sets to the bits of the RESET field in order. For example, the jth sub-resource set is mapped to the (j mod B)+1th bit of the RESET field, where B is the number of bits in the RESET field, and X mod Y is the remainder when X is divided by Y.

[0171] The time-frequency resources corresponding to different RESETs overlap each other. In this case, a method for a UE to receive a physical data channel on the time-frequency resources corresponding to RESETs is an issue, which will be described with reference to FIGS. 22 to 24.

[0172] 22 to 24 are diagrams illustrating a case where time-frequency resources indicated to be occupied by different RESETs overlap.

[0173] When the base station sets RESETs to the terminal, the terminal assumes that the RESETs do not overlap with each other. In particular, if time-frequency resources corresponding to different RESETs overlap, the terminal determines that the corresponding time-frequency resources are included in one RESET and not included in the remaining RESETs. In particular, the terminal determines that the time-frequency resources overlapping in RESET(s) are included in one RESET according to the priority of the RESET. In this case, the priority of the RESET is explicitly indicated by the RRC signal. In another specific embodiment, the priority of the RESET is determined according to the order in which the RESET is set in the RRC signal. In another specific embodiment, the priority of the RESET is determined by the bit index of the RESET field to which the RESET is mapped. In addition, the priority of the RESET including the CORESET that the terminal monitors to receive the physical control channel is always the highest. In addition, the priority of the RESET including the CORESET in which the terminal has received the PDCCH is always the highest.

[0174] In the embodiment of FIG. 22, the time-frequency resources designated to be occupied by the first RESET (RESET#1) and the time-frequency resources designated to be occupied by the second RESET (RESET#2) overlap. In the embodiment of FIG. 22(a), the priority of the second RESET (RESET#2) is higher than the priority of the first RESET (RESET#1). Thus, the time-frequency resources that are overlapped by the time-frequency resources designated to be occupied by the first RESET (RESET#1) and the time-frequency resources designated to be occupied by the second RESET (RESET#2) are included in the second RESET (RESET#2) and are not included in the first RESET (RESET#1). In the embodiment of FIG. 22(b), the priority of the first RESET (RESET#1) is higher than the priority of the second RESET (RESET#2). Therefore, the time-frequency resources where the time-frequency resources designated to be occupied by the first RESET (RESET#1) and the time-frequency resources designated to be occupied by the second RESET (RESET#2) overlap are included in the first RESET (RESET#1) but not included in the second RESET (RESET#2).

[0175] In another specific embodiment, when the base station sets RESET to the terminal, the terminal assumes that the RESETs overlap each other. In this case, if the bits of the RESET fields corresponding to different RESETs indicate different information, a problem occurs. For example, a bit of the L1-signaling bit field corresponding to the first RESET indicates whether the first RESET cannot be used to receive a physical data channel, and a bit of the L1-signaling bit field corresponding to the second RESET indicates that the second RESET can be used to receive a physical data channel. In this case, the terminal prioritizes one of the pieces of information. More specifically, it prioritizes the information indicating that the physical data channel can be used to receive. In the embodiment of FIG. 23 to FIG. 24, as shown in FIG. 23(a), the time-frequency resource designated to be occupied by the first RESET (RESET#1) and the time-frequency resource designated to be occupied by the second RESET (RESET#2) overlap each other. In the embodiment of FIG. 23(b), the RESET field indicates that the first RESET (RESET#1) is not usable for receiving the PDSCH, and indicates that the second RESET (RESET#2) is not usable for receiving the PDSCH. Thus, the terminal receives the PDSCH in the second RESET (RESET#2) including the time-frequency resource where the first RESET (RESET#1) and the second RESET (RESET#2) overlap. In the embodiment of FIG. 23(c), the RESET field indicates that the first RESET (RESET#1) is not usable for receiving the PDSCH, and indicates that the second RESET (RESET#2) is not usable for receiving the PDSCH. Thus, the terminal receives the PDSCH in the first RESET (RESET#1) including the time-frequency resource where the first RESET (RESET#1) and the second RESET (RESET#2) overlap.

[0176] In particular, information indicating that the PDSCH cannot be used for receiving the physical data channel is prioritized. In the embodiment of FIG. 24(a), the RESET field indicates that the first RESET (RESET#1) cannot be used for receiving the PDSCH, and indicates that the second RESET (RESET#2) is not unusable for receiving the PDSCH. Thus, the terminal receives the PDSCH in the second RESET (RESET#2) except for the time-frequency resource where the first RESET (RESET#1) and the second RESET (RESET#2) overlap. In the embodiment of FIG. 24(b), the RESET field indicates that the first RESET (RESET#1) is not unusable for receiving the PDSCH, and indicates that the second RESET (RESET#2) is not unusable for receiving the PDSCH. Thus, the terminal receives the PDSCH in the first RESET (RESET#1) except for the time-frequency resource where the first RESET (RESET#1) and the second RESET (RESET#2) overlap.

[0177] In addition, if different RESETs overlap and the L1-signaling bit fields corresponding to different RESETs indicate different information, the terminal determines whether to prioritize information indicating that the physical data channel cannot be received or information indicating that the physical data channel can be received based on the RRC signal. In addition, the terminal independently determines which information to prioritize for each RESET. The terminal prioritizes information indicating that the physical data channel cannot be received in the time-frequency resource corresponding to the first RESET, and prioritizes information indicating that the physical data channel can be received in the time-frequency resource corresponding to the second RESET.

[0178] FIG. 25 is a diagram showing a slot configuration used in a wireless communication system according to an embodiment of the present invention.

[0179] One slot includes 7 OFDM symbols. In another specific embodiment, one slot includes 14 OFDM symbols. The slot includes a DL symbol used for DL ​​transmission. The slot also includes a UL symbol used for UL transmission. The slot also includes a gap (GAP) symbol that is not used for DL ​​transmission or UL transmission when changing from DL transmission to UL transmission or from UL transmission to DL transmission. This is because the base station and the terminal need time to change from a transmission mode to a reception mode or from a reception mode to a transmission mode. The gap symbol is one OFDM symbol. The gap symbol also includes one OFDM symbol that transmits DL control information.

[0180] FIG. 25 shows eight slot configurations. In Format 0, a slot includes only DL symbols (DL). In Format 1, a slot includes six DL symbols (DL) and one gap symbol (GP). In Format 2, a slot includes five DL symbols (DL), one gap symbol (GP), and one UL symbol (UL). In Format 3, a slot includes four DL symbols (DL), one gap symbol (GP), and two UL symbols (UL). In Format 4, a slot includes three DL symbols (DL), one gap symbol (GP), and three UL symbols (UL). In Format 5, a slot includes two DL symbols (DL), one gap symbol (GP), and four UL symbols (UL). In Format 6, a slot includes one DL symbol (DL), one gap symbol (GP), and five UL symbols (UL). In Format 7, a slot includes six UL symbols (UL) and one gap symbol (GP). In Format 8, a slot includes only UL symbols (UL). For convenience of explanation, a slot including only DL symbols such as Format 0 is called a DL-only slot, a slot including only UL symbols such as Format 7 is called a UL-only slot, and a slot including both DL and UL symbols such as Format 1 to Format 6 is called a hybrid slot. In a slot that is not a UL-only slot, a CORESET for PDCCH transmission is set. In this case, a group-common PDCCH and a UE-specific PDCCH are transmitted in the CORESET. One or more UEs receive the group-common PDCCH. In addition, the group-common PDCCH includes slot configuration information indicating a slot configuration. In this case, the group-common PDCCH includes slot configuration information of a slot in which the PDCCH is transmitted. In addition, the group-common PDCCH includes not only the slot in which the PDCCH is transmitted but also the slot configuration information next to the slot in which the PDCCH is transmitted.Also, the group-common PDCCH includes slot configuration information of not only the slot in which the PDCCH is transmitted but also N future slots. In this case, the future slots are slots that correspond to a time later than the slot in which the PDCCH is transmitted. Also, N is a natural number equal to or greater than 1. N is dynamically changed. Also, N is set by an RRC signal. Also, the base station dynamically indicates to the terminal within the set set in the RRC signal.

[0181] A method for signaling slot configuration information will be described with reference to Figures 26 to 33.

[0182] FIG. 26 is a diagram illustrating a terminal-specific PDCCH indicating scheduled resources to a terminal in a wireless communication system according to an embodiment of the present invention.

[0183] In the embodiment of FIG. 26, the terminal specific PDCCH for the first terminal UE1 indicates the time-frequency resource scheduled for receiving the PDSCH of the first terminal UE1. Also, the terminal specific PDCCH for the second terminal UE2 indicates the time-frequency resource scheduled for receiving the PUSCH of the second terminal UE2. At this time, the base station indicates the continuous time-frequency resource using one indication value. More specifically, in the LTE system, the base station indicates the continuous time-frequency resource using one indication value. At this time, the indication value is called RIV, and such an indication method is called RIV method. More specifically, the RIV indicates the start position of the continuous resource and the number of the continuous resources. The terminal determines the start position of the continuous resource allocated to the terminal and the number of the corresponding resources based on the RIV.

[0184] In type-2 resource allocation in the LTE system, the RIV is used as follows: If the DCI format of the PDCCCH is one of 1A, 1B, and 1D, if the DCI format of the EPDCCH is one of 1A, 1B, and 1D, or if the DCI format of the MPDCCH is 6-1A, the DCI includes an RIV. The base station uses the RIV to indicate contiguous resources in the frequency domain for which the terminal is scheduled to receive a physical data channel. In this case, the terminal selects an RB that is the start RB of the contiguous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI. start and L, the number of consecutive RBs in the resource. CRBs Therefore, the base station determines the value of RIV according to the following formula:

[0185]

number

[0186] In this case, N DL RB is the total number of RBs used for resource allocation for DL ​​transmission. If the type-2 resource allocation scheme is used for UL transmission, N DL RB is the total number of RBs used for resource allocation for UL transmission, N UL RB is replaced by.

[0187] If the PDCCH format is 1C, the base station indicates scheduled resources to the terminal in units of multiple RBs according to a type-2 resource allocation scheme.

number

[0188]

number

[0189] In addition, the number of consecutive RBs of the consecutive resources indicated by the RIV that the base station can set is as follows:

[0190]

number

[0191] In this case, the base station determines the value of the RIV according to the following formula:

[0192]

number

[0193] In this case, N DL RB is the total number of RBs used for resource allocation for DL ​​transmission. If the type-2 resource allocation scheme is used for UL transmission, N DL RB is the total number of RBs used for resource allocation for UL transmission, N UL RB is replaced by.

[0194] The base station uses the RIV to indicate continuous resources in the time domain for which the terminal is scheduled to receive a physical data channel. In this case, the terminal determines S, which is the start OFDM symbol of the continuous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI. start and L, the number of consecutive OFDM symbols. symbols Get S. start is interpreted as a position within a slot. For example, S start If =0, then S start denotes the first OFDM symbol in a slot. N symbolIf RIV is the total number of symbols assigned to the reception of the physical data channel of the terminal scheduled by the DCI, then the value of RIV is determined by the following formula:

[0195]

number

[0196] The base station indicates scheduled resources to the terminal in units of multiple OFDM symbols.

number

[0197]

number

[0198] In addition, the number of consecutive OFDM symbols of consecutive resources indicated by the RIV that the base station can set is as follows:

[0199]

number

[0200] The base station sets the value of RIV according to the following formula:

[0201]

number

[0202] FIG. 27 is a diagram illustrating a wireless communication system according to an embodiment of the present invention in which a base station transmits two RIVs to a terminal to indicate a scheduled time-frequency resource region to the terminal.

[0203] As described above, the base station indicates the time-frequency resource for which the terminal is scheduled to receive the PDSCH or the time-frequency resource for which the terminal is scheduled to transmit the PUSCH using the RIV. In this case, the terminal receives the PDSCH or transmits the PUSCH on the time-frequency resource indicated by the RIV. The base station indicates the scheduled resource to the terminal using the RIV value in the frequency domain and the RIV value in the time domain. In more detail, the base station indicates the RIV value in the frequency domain and the RIV value in the time domain independently to indicate the scheduled time-frequency resource to the terminal. For convenience of explanation, the RIV in the frequency domain will be referred to as the RIV. freq and the RIV in the time domain is RIV time In a specific embodiment, the base station uses the RIV for scheduling the PDSCH reception. freq and RIV time , and transmits DCI including the two RIVs, indicating the time-frequency resources allocated to the PDSCH.

[0204] In the embodiment of FIG. 27, the base station transmits the RIV via the DCI. freq and RIV time At this time, the terminal transmits the RIV according to the above embodiment. freq and RIV time In detail, the terminal determines the time-frequency domain indicated by the RIV according to the above embodiment. freq From L CRB and R.B. start The terminal also acquires RIV time From L symbols and S. start to obtain.

[0205] If the maximum value of RIV is Q, then the bit length required to represent RIV is

number

[0206] FIG. 28 is a diagram illustrating a wireless communication system according to an embodiment of the present invention in which a base station transmits two RIVs to a terminal to indicate a scheduled time-frequency resource region to the terminal.

[0207] The base station transmits one RIV to indicate the scheduled time-frequency resources to the terminal. In this case, one RIV is a value generated by encoding two RIVs (RIV1, RIV2). The two RIVs are the above-mentioned RIVs. freq and RIV time The maximum value of RIV1 is RIV1 max The RIV that was purified by encoding two RIVs was called the final RIV (RIV total The base station calculates the final RIV (RIV total ) value.

[0208]

number

[0209] Also, the terminal is the final RIV (RIV total) to obtain RIV1 and RIV2 using the following formula:

[0210]

number

[0211] In this case, RIV1 is RIV freq Also, RIV2 is RIV time If the base station schedules time-frequency resources to the terminal in units of one RB, RIV freq RIV, the maximum value of freq max is determined by the following formula:

[0212]

number

[0213] The base station schedules time-frequency resources to the terminal in units of multiple RBs, and the number of multiple RBs is

number

[0214]

number

[0215] At this time,

number

[0216] In this case, RIV2 is RIV time In addition, RIV1 is RIV freq If the base station schedules time-frequency resources to the terminal in one OFDM unit, RIV time RIV, the maximum value of time max is determined by the following formula:

[0217]

number

[0218] The base station schedules time-frequency resources to the terminal in units of multiple OFDM symbols, and the number of RBs is

number

[0219]

number

number

[0220] In the embodiment of FIG. 28, the base station transmits one final RIV (RIV total The terminal transmits the final RIV (RIV total ) to RIVtime and RIV freq The terminal acquires IV freq From L CRB and R.B. start The terminal also acquires RIV time From L symbols and S. start to obtain.

[0221] In another embodiment, the base station encodes three or more RIVs into one final RIV (RIV total ) and use DCI to generate the final RIV (RIV total In this case, the base station encodes the RIVs two by two in sequence to generate the final RIV (RIV total For example, the base station encodes three RIVs (RIV1, RIV2, RIV3) to generate the final RIV (RIV total In this case, the base station first encodes two RIVs (RIV1, RIV2) to generate an intermediate RIV. Then, the base station encodes the intermediate RIV and the remaining RIV (RIV3) to generate a final RIV (RIV total )

[0222] Through this embodiment, the base station reduces the number of bits used for RIV transmission. For example, assume that the UE can schedule six RBs and nine OFDM symbols. In this case, the RIV freq RIV has a value between 0 and 20. time RIV has a value between 0 and 44. freq and RIV time Encode the final RIV (RIV total ) is generated, the final RIV (RIV total ) has a value between 0 and 944. Therefore, the final RIV (RIV total In particular, according to such an embodiment, the base station transmits the RIV freq and RIV timeThe number of bits of the DCI used for RIV transmission can be reduced by one bit compared to the case where each of the RIVs is transmitted. freq and RIV time When transmitting each of the RIVs, the number of DCI bits required for the RIV is shown according to the number of RBs and OFDM symbols that the terminal can schedule. freq and RIV time Encode the final RIV (RIV total ), the number of DCI bits required for RIV transmission is shown according to the number of RBs and the number of OFDM symbols that the UE can schedule. total ), it can be seen that the number of DCI bits required for RIV transmission can be reduced.

[0223] [Table 4]

[0224] [Table 5]

[0225] In the above embodiment, the final RIV (RIV total ) and the final RIV(RIV totalIn the above description, only the case where the transmission of the RIV indicates the time-frequency resources to be scheduled in the DCI has been described. However, the above-described embodiment is not limited to this case, and can also be applied to the case where the time-frequency resources are indicated using the RIV. For example, the above-described embodiment may be applied when the base station schedules the time-frequency resources via the RRC signal. Also, the above-described embodiment is applied when the base station indicates the preempted time-frequency resources to the terminal. In this case, the preempted time-frequency resources indicate that some resources among the time-frequency resources already scheduled to the terminal are not scheduled to the terminal.

[0226] The base station indicates the time resource to be scheduled to the terminal according to the following embodiment. In particular, the base station sets a time resource mapping table indicating mapping between the physical data channel scheduled to the terminal and the time resource using an RRC signal. At this time, the RRC signal is a terminal-specific RRC signal. In addition, the base station signals the state of the mapping table using any one of the fields included in the DCI for scheduling the reception of the physical data channel of the terminal or the transmission of the physical data channel. The terminal determines the mapping table of the time resource set by the base station based on the RRC signal, and determines the time resource region in which the corresponding data channel is scheduled based on any one of the fields included in the DCI for scheduling the reception of the physical data channel of the terminal or the transmission of the physical data channel. The number of states of the time resource mapping table is 16. At this time, any one of the fields included in the DCI is 4 bits. The time resource mapping table includes a K1 value indicating a HARQ-ACK transmission slot, a slot in which a physical data channel is transmitted, a first OFDM symbol in which the physical data channel is scheduled in the slot in which the physical data channel is transmitted, the number of OFDM symbols in which the physical data channel is scheduled, and a mapping type of the physical data channel. In this case, the mapping type of the physical data channel indicates whether the position of a demodulation reference signal (DMRS) is determined regardless of the position of the physical data channel. In a specific embodiment, the base station uses 6 bits of the RRC signal to set a slot in which a physical data channel is transmitted, a first OFDM symbol in which the physical data channel is scheduled in the slot in which the physical data channel is transmitted, and the number of OFDM symbols in which the physical data channel is scheduled. For example, 2 bits of the 6 bits indicate a slot in which a physical data channel is transmitted. The 2 bits indicating a slot in which a physical data channel is transmitted are referred to as K0. K0 indicates the difference in index between the slot in which the terminal receives DCI and the slot in which the physical data channel scheduled to the terminal is transmitted. The value of K0 is 00. b , 01b , 10 b , and 11 b If the value of K0 is 0, the slot in which the UE receives DCI is the same as the slot in which the physical data channel scheduled for the UE is transmitted. In addition, 4 bits out of 6 bits indicate the first OFDM symbol in which the physical data channel is scheduled and the number of OFDM symbols in which the physical data channel is scheduled in the slot in which the physical data channel is transmitted. In this case, the number of OFDM symbols in which the physical data channel is scheduled is one of 2, 4, 7, and 14. In particular, the 4 bits are mapped to the first OFDM symbol in which the physical data channel is scheduled and the number of OFDM symbols in which the physical data channel is scheduled as shown in Table 6 below.

[0227] [Table 6]

[0228] When the OFDM symbol index of one slot is set to 0 to 15, each state indicates the following OFDM symbol. The OFDM symbols indicated by the state values ​​are as follows. 0:{0, 1}, 1:{2, 3}, 2:{4, 5}, 3:{6, 7}, 4:{8, 9}, 5:{10, 11}, 6:{12, 13}, 7:{0, 1, 2, 3}, 8:{2, 3, 4, 5}, 9:{4, 5, 6, 7}, 10:{6, 7, 8, 9}, 11:{8, 9, 10, 11}, 12:{10, 11, 12, 13}, 13:{0, 1, 2, 3, 4, 5, 6}, 14:{7, 8, 9, 10, 11, 12, 13}, 15:{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}. In this case, in X:{Y}, X indicates the value of the state, and Y indicates the OFDM symbol indicated by the X state.

[0229] In another specific embodiment, one bit of the six bits indicates a slot in which a physical data channel is transmitted. The one bit indicating the slot in which a physical data channel is transmitted is called K0. K0 indicates an index difference between a slot in which a terminal receives DCI and a slot in which a physical data channel scheduled for the terminal is transmitted. K0 has a value of either 0 or 1. If the value of K0 is 0, the slot in which a terminal receives DCI and the slot in which a physical data channel scheduled for the terminal is transmitted are the same. If the value of K0 is 1, the difference between an index of a slot in which a terminal receives DCI and an index of a slot in which a physical data channel scheduled for the terminal is transmitted is E. In this case, E is fixed to a natural number different from 1. In addition, five bits of the six bits indicate a first OFDM symbol in which a physical data channel is scheduled in a slot in which a physical data channel is transmitted and the number of OFDM symbols in which a physical data channel is scheduled. In this case, the number of OFDM symbols in which a physical data channel is scheduled is one of 1, 2, 4, 7, and 14. In detail, the 5 bits are mapped to the first OFDM symbol for which the physical data channel is scheduled and the number of OFDM symbols for which the physical data channel is scheduled, as shown in Table 7 below.

[0230] [Table 7]

[0231] 0:{0, 1}, 1:{2, 3}, 2:{4, 5}, 3:{6, 7}, 4:{8, 9}, 5:{10, 11}, 6:{12, 13}, 7:{0, 1, 2, 3}, 8:{2, 3, 4, 5}, 9:{4, 5, 6, 7}, 10:{6, 7, 8, 9}, 11:{8, 9, 10, 11}, 12:{10, 11, 12, 13}, 13:{0, 1, 2, 3, 4, 5, 6}, 14 :{7, 8, 9, 10, 11, 12, 13}, 15:{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}, 16:{0}, 17:{1}, 18:{2}, 19:{3}, 20:{4}, 21:{5}, 22:{6}, 23:{7}, 24:{8}, 25:{9}, 26:{10}, 27:{11}, 28:{12}, 29:{13}. In this case, X:{Y} indicates the state value, and Y indicates the OFDM symbol indicated by the X state. State values ​​30 and 31 are reserved. State values ​​30 and 31 respectively indicate all DL symbols set semi-statically and all unknown symbols set semi-statically. In this case, the unknown symbols indicate symbols that are not set as UL symbols or DL ​​symbols. State values ​​30 and 31 respectively indicate all OFDM symbols excluding a specified number of OFDM symbols from the end of the slot among all DL symbols set semi-statically and all unknown symbols set semi-statically. In this case, the specified number is a fixed number. For example, the specified number may be 1. In addition, the specified number is separately specified for each terminal. In detail, the specified number is set for each terminal by an RRC signal.

[0232] In another specific embodiment, one bit of the six bits indicates a reference position of a slot in which a physical data channel is transmitted. In this case, one bit indicates whether the reference position of a slot in which a physical data channel is transmitted is the first OFDM symbol of the slot or the OFDM symbol immediately following CORESET. Five bits of the six bits indicate the number of OFDM symbols in which a physical data channel is scheduled. One bit of the six bits indicates the start time of a slot, and if the index of the OFDM start symbol indicated by the five bits of the six bits is A, the physical data channel is transmitted from A using OFDM symbols corresponding to the number of OFDM symbols in which the physical data channel is transmitted. One bit of the six bits indicates the OFDM symbol immediately following CORESET, and if the index of the OFDM start symbol indicated by the five bits of the six bits is A, the physical data channel is transmitted from A using OFDM symbols corresponding to the number of OFDM symbols in which the physical data channel is transmitted. In this case, B is the index of the OFDM symbol immediately following the CORESET.

[0233] 29 to 33 are diagrams illustrating OFDM symbols corresponding to physical data channels scheduled to terminals indicated by 6 bits of an RRC signal in a wireless communication system according to another embodiment of the present invention.

[0234] In a specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the scheduled physical data channel to the terminal indicate 14 states in which the number of OFDM symbols for which the physical data channel is scheduled is 1, 2 states in which the number of OFDM symbols for which the physical data channel is scheduled is 7, and 28 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. In this case, the state in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2 follows the RIV method of indicating 14 OFDM symbols in groups of two. According to a specific embodiment, the OFDM symbols indicated by the 6 bits are as shown in FIG. 29.

[0235] In another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the scheduled physical data channel to the terminal indicate 14 states in which the number of OFDM symbols for which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols for which the physical data channel is scheduled is 7, and 28 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. In this case, the state in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2 indicates that it starts from an even OFDM symbol index. According to a specific embodiment, the OFDM symbols indicated by the 6 bits are as shown in FIG. 30.

[0236] In another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the scheduled physical data channel to the terminal indicate 14 states in which the number of OFDM symbols for which the physical data channel is scheduled is 1, and 49 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. In this case, it is indicated that, of the 49 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2, 28 states start from an even OFDM symbol index and 21 states start from an odd OFDM symbol index. According to a specific embodiment, the OFDM symbols indicated by the 6 bits are as shown in FIG. 31.

[0237] In yet another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the scheduled physical data channel to the terminal indicate 14 states in which the number of OFDM symbols for which the physical data channel is scheduled is 1, and 48 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. In this case, of the 48 states in which the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2, 28 states start from the even OFDM symbol index and 20 states start from the odd OFDM symbol index. According to a specific embodiment, the OFDM symbols indicated by the 6 bits are as shown in FIG. 32.

[0238] In another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the scheduled physical data channel to the terminal may include 14 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols on which the physical data channel is scheduled is 7, 13 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 11 states in which the number of OFDM symbols on which the physical data channel is scheduled is 4, 1 state in which the number of OFDM symbols on which the physical data channel is scheduled is 14, 4 states in which the number of OFDM symbols on which the physical data channel is scheduled is 3, 1 state in which the physical data channel is scheduled is 14, 1 state in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 2 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 3 states in which the number of OFDM symbols on which the physical data channel is scheduled is 3, 4 states in which the physical data channel is scheduled is 1, 5 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 6 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 7 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 13 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 11 states in which the number of OFDM symbols on which the physical data channel is scheduled is 4, 1 state in which the number of OFDM symbols on which the physical data channel is scheduled is 14, 1 state in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 2 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 3 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 4 states in which The physical data channel may be scheduled for 2 OFDM symbols, 2 states in which the number of OFDM symbols scheduled for the physical data channel is 5, 2 states in which the number of OFDM symbols scheduled for the physical data channel is 6, one state in which the number of OFDM symbols scheduled for the physical data channel is 8, one state in which the number of OFDM symbols scheduled for the physical data channel is 9, one state in which the number of OFDM symbols scheduled for the physical data channel is 10, one state in which the number of OFDM symbols scheduled for the physical data channel is 11, one state in which the number of OFDM symbols scheduled for the physical data channel is 12, and one state in which the number of OFDM symbols scheduled for the physical data channel is 13. In this case, the state in which the number of OFDM symbols scheduled for the physical data channel is 2 starts from an OFDM symbol index that is a multiple of 3. According to a specific embodiment, the OFDM symbols indicated by 6 bits are as shown in FIG.

[0239] In another specific embodiment, 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled to the terminal indicate 14 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols on which the physical data channel is scheduled is 7, 13 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 11 states in which the number of OFDM symbols on which the physical data channel is scheduled is 4, one state in which the number of OFDM symbols on which the physical data channel is scheduled is 14, 10 states in which the number of OFDM symbols on which the physical data channel is scheduled is 5, and 7 states in which the number of OFDM symbols on which the physical data channel is scheduled is 8. In this case, the state in which the number of OFDM symbols on which the physical data channel is scheduled is 1 indicates starting from all possible OFDM symbol indexes.

[0240] In another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled to the terminal indicate 14 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols on which the physical data channel is scheduled is 7, 13 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 11 states in which the number of OFDM symbols on which the physical data channel is scheduled is 4, one state in which the number of OFDM symbols on which the physical data channel is scheduled is 14, 12 states in which the number of OFDM symbols on which the physical data channel is scheduled is 3, and 5 states in which the number of OFDM symbols on which the physical data channel is scheduled is 10. In this case, the state in which the number of OFDM symbols on which the physical data channel is scheduled is 1 indicates starting from all possible OFDM symbol indexes.

[0241] In yet another specific embodiment, the 6 bits of the RRC signal used by the base station to indicate the physical data channel scheduled to the terminal indicate 14 states in which the number of OFDM symbols on which the physical data channel is scheduled is 1, 8 states in which the number of OFDM symbols on which the physical data channel is scheduled is 7, 13 states in which the number of OFDM symbols on which the physical data channel is scheduled is 2, 11 states in which the number of OFDM symbols on which the physical data channel is scheduled is 4, one state in which the number of OFDM symbols on which the physical data channel is scheduled is 14, 9 states in which the number of OFDM symbols on which the physical data channel is scheduled is 6, 6 states in which the number of OFDM symbols on which the physical data channel is scheduled is 9, and 2 states in which the number of OFDM symbols on which the physical data channel is scheduled is 11. In this case, the state in which the number of OFDM symbols on which the physical data channel is scheduled is 1 indicates starting from all possible OFDM symbol indexes.

[0242] A method of indicating time-frequency resources scheduled to a terminal using an RIV has been described above. The base station indicates continuous resources in the time domain scheduled to the terminal using the RIV. In this case, the base station indicates the position of the start symbol of the continuous resources scheduled to the terminal using an index of a reference OFDM symbol. The index of the start OFDM symbol indicated by the RIV is a value obtained by subtracting the index of the reference OFDM symbol from the start OFDM symbol of the time-frequency resources scheduled to the terminal. In particular, the base station signals the index of the reference OFDM symbol using an RRC signal. In addition, the base station determines the value of the RIV according to the following equation.

[0243]

number

[0244] L symbols denotes the number of OFDM symbols of the time resource scheduled to the terminal. start is the index of the start OFDM symbol of the time resource scheduled to the terminal obtained based on the index of the reference OFDM symbol. Therefore, the OFDM symbol index of the time resource scheduled to the terminal is obtained by the following formula.

[0245] S start =S start '+R

[0246] In this case, R is the index of the reference OFDM symbol. By using the reference OFDM symbol in this way, the size of the memory that the terminal needs to prepare for receiving the data channel can be reduced. In addition, this embodiment can reduce the number of bits of the field used to transmit the RIV.

[0247] In the above, it is assumed that the base station sets the index of the reference OFDM symbol using the RRC signal. In another specific embodiment, the terminal assumes that the index of the reference OFDM symbol is the first OFDM symbol of the slot. In another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. For example, the terminal determines the index of the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted as the index of the reference OFDM symbol. In yet another specific embodiment, the terminal determines the index of the OFDM symbol immediately following the last OFDM symbol of the CORESET in which the DCI for scheduling the time resource of the terminal is transmitted as the index of the reference OFDM symbol. If the index of the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted to the terminal is K and the number of OFDM symbols corresponding to the time resource occupied by the CORESET is A, the index of the reference OFDM symbol is K+A. The number of bits required for transmitting the RRC signal can be reduced compared to when the index of the reference OFDM symbol is signaled via the RRC signal.

[0248] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol according to the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted and the above-mentioned K0 value. K0 indicates a slot in which the PDSCH is scheduled. If K0=0, it indicates that the DCI for scheduling the reception of the physical data channel of the terminal and the corresponding physical data channel are transmitted in the same slot. Also, if K0=1, it indicates that the corresponding physical data channel is transmitted in the slot immediately following the slot in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted to the terminal. In a specific embodiment, if K0 is greater than 0, the terminal determines the index of the reference OFDM symbol to be 0. Also, if K0 is equal to 0, the terminal determines the index of the reference OFDM symbol to be the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In another specific embodiment, if K0 is equal to 0, the terminal determines the index of the reference OFDM symbol to be the index of the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted plus the number of OFDM symbols corresponding to the time resource occupied by the CORESET. In this embodiment, the terminal performs different operations when cross-scheduling is performed and when it is not performed, thereby reducing the number of bits required for RIV transmission. In addition, the number of bits required for RRC signal transmission can be reduced compared to when the index of the reference OFDM symbol is signaled through the RRC signal.

[0249] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on a mapping type of a physical data channel received by the terminal. In this case, the mapping type of the physical data channel indicates whether the position of the DMRS is determined regardless of the position of the physical data channel. In addition, the physical channel received by the terminal is a PDSCH. In detail, the mapping type of the physical data channel is classified into Type A and Type B. Type A indicates that the position of the DMRS is fixed to OFDM symbol index 2 or 3 in a slot. In this case, the position of the DMRS is indicated by the PBCH. In addition, Type B indicates that the first DMRS is located in the first OFDM symbol of the physical data channel. If the mapping type of the physical data channel is Type A, the terminal determines the index of the reference OFDM symbol to be 0. In addition, if the mapping type of the physical data channel is Type B, the terminal determines the index of the reference OFDM symbol to be the index of the first OFDM symbol of the CORESET in which DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In a further specific embodiment, if the mapping type of the physical data channel is Type B, the terminal determines that the index of the reference OFDM symbol is the index of the first OFDM symbol of the CORESET in which DCI for scheduling reception of the physical data channel of the terminal is transmitted plus the number of OFDM symbols corresponding to the time resource occupied by the corresponding CORESET.

[0250] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the position of the DCI for scheduling the reception of the physical data channel of the terminal. In particular, if the DCI for scheduling the reception of the physical data channel of the terminal is located before the pre-designated OFDM symbol, the terminal determines the index of the reference OFDM symbol as 0. Also, if the DCI for scheduling the reception of the physical data channel of the terminal is located before the pre-designated OFDM symbol, the terminal determines the index of the reference OFDM symbol as the index of the first OFDM symbol of the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In yet another specific embodiment, if the DCI for scheduling the reception of the physical data channel of the terminal is located before the pre-designated OFDM symbol, the terminal determines the index of the reference OFDM symbol as the index of the first OFDM symbol of the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted plus the number of OFDM symbols corresponding to the time resource occupied by the corresponding CORESET. The pre-specified OFDM symbol position is the same as the DMRS position when the mapping type of the physical data channel received by the terminal set by the PBCH is Type A. In particular, if the mapping type of the physical data channel is Type A and the PBCH indicates the second OFDM symbol as the DMRS position, the pre-specified OFDM symbol position is the second OFDM symbol. Also, if the mapping type of the physical data channel is Type A and the PBCH indicates the third OFDM symbol as the DMRS position, the pre-specified OFDM symbol position is the third OFDM symbol.

[0251] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted, the above-mentioned K0 value, and whether the DCI for scheduling the reception of the physical data channel of the terminal is located before the pre-designated OFDM symbol. K0 indicates a slot in which the PDSCH is scheduled. In a specific embodiment, if K0 is greater than 0 or the DCI for scheduling the reception of the physical data channel of the terminal is located before the pre-designated OFDM symbol, the terminal determines the index of the reference OFDM symbol to be 0. Also, if K0 is equal to 0 and the DCI for scheduling the reception of the physical data channel of the terminal is not located before the pre-designated OFDM symbol, the terminal determines the index of the reference OFDM symbol to be the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In yet another specific embodiment, if K0 is equal to 0 and the DCI for scheduling the reception of the physical data channel of the terminal is not located before the pre-specified OFDM symbol, the terminal determines the index of the reference OFDM symbol to be the index of the first OFDM symbol of the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted plus the number of OFDM symbols corresponding to the time resource occupied by the CORESET. In such an embodiment, the terminal performs different operations when cross-scheduling is performed and when it is not performed, thereby reducing the number of bits required for RIV transmission. In addition, the number of bits required for RRC signal transmission can be reduced compared to when the index of the reference OFDM symbol is signaled through the RRC signal.

[0252] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the CORESET monitored by the terminal. In particular, if multiple CORESETs monitored by the terminal are set in one slot, the terminal determines the index of the reference OFDM symbol as the earliest OFDM symbol among the OFDM symbols occupied by the multiple CORESETs. This is because it is difficult for the terminal to determine through which CORESET among the multiple CORESETs the base station transmits the physical control channel. Through this embodiment, the terminal can receive the physical data channel regardless of which CORESET among the multiple CORESETs the physical control channel is transmitted through.

[0253] In yet another specific embodiment, if the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted is located in a slot different from the slot on which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol to be 0. Also, if the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted is located in the same slot as the slot on which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol to be the first OFDM symbol of the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In yet another specific embodiment, if the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted is located in the same slot as the slot on which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol to be the sum of the index of the first OFDM symbol of the CORESET on which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted and the number of OFDM symbols corresponding to the time resource occupied by the CORESET.

[0254] In addition, when the DCI schedules the terminal to receive a physical data channel, the terminal does not expect that the first OFDM symbol and the last OFDM symbol of the time-frequency resource scheduled to receive the physical data channel of the terminal are located in different slots. In particular, the terminal determines the last OFDM symbol of the time-frequency resource scheduled to receive the physical data channel of the terminal to be the last OFDM symbol of the slot in which the start OFDM symbol of the time-frequency resource scheduled to receive the physical data channel of the terminal is located, or the symbol before the last OFDM symbol. For example, the number of OFDM symbols included in the slot is 14, and the DCI indicates that the last OFDM symbol of the time-frequency resource scheduled to receive the physical data channel of the terminal is the 7th OFDM symbol. In this case, if the number of OFDM symbols occupied by the time-frequency resource scheduled to receive the physical data channel of the terminal indicated by the DCI is 7, the terminal determines that the OFDM symbols scheduled to receive the physical data channel of the terminal are from the 7th OFDM symbol to the 14th OFDM symbol. In the above embodiment, the physical data channel received by the terminal is the PDSCH.

[0255] The above-mentioned embodiment in which the base station indicates the position of the start symbol of the scheduled consecutive resources to the terminal using the index of the reference OFDM symbol is also applied when the base station schedules the physical channel transmission of the terminal. In particular, the terminal determines the index of the reference OFDM symbol to be the first OFDM symbol of the slot. The OFDM symbol referred to in relation to the physical channel transmission of the terminal is the DFT-S-OFDM symbol.

[0256] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the mapping type of the physical data channel transmitted by the terminal. In this case, the mapping type of the physical data channel transmitted by the terminal indicates whether the position of the DMRS is determined regardless of the position of the physical data channel. In addition, the physical channel transmitted by the terminal is a PUSCH. In addition, the mapping type of the physical data channel transmitted by the terminal is set via the UL-DMRS-config-type transmitted in the RRC signal. In detail, the mapping type of the physical data channel is classified into Type A and Type B. Type A indicates that the position of the first DMRS is fixed within a slot. In addition, Type B indicates that the first DMRS is located at the first OFDM symbol of the physical data channel. If the mapping type of the physical data channel is Type A, the terminal determines the index of the reference OFDM symbol to be the index of the first OFDM symbol corresponding to the physical data channel. If the mapping type of the physical data channel is Type B, the terminal determines the index of the reference OFDM symbol to be 0.

[0257] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the mapping type of the physical data channel transmitted by the terminal and the waveform of the UL transmission. The terminal performs UL transmission using one of CP-OFDM and DFT-S-OFDM. The base station uses an RRC signal to determine whether the terminal uses one of CP-OFDM and DFT-S-OFDM. If the mapping type of the physical data channel is Type B, the terminal determines the index of the reference OFDM symbol to be 0. If the mapping type of the physical data channel is Type A and the terminal is configured to use the DFT-S-OFDM waveform, the terminal determines the index of the reference OFDM symbol to be the index of the OFDM symbol next to the OFDM symbol where the first DMRS is located. This is because the DFT-S-OFDM symbol used in the UL DMRS may not be available for physical data channel UL transmission. Also, if the mapping type of the physical data channel is Type A and the terminal is configured to use the CP-OFDM waveform, the terminal determines the index of the reference OFDM symbol as the index of the OFDM symbol in which the first DMRS is located.

[0258] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on a semi-statically set symbol configuration. In particular, the terminal determines the index of the reference OFDM symbol as the index of the unknown symbol immediately following the DL symbol in the slot in which the physical data channel of the terminal is scheduled. In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol as the index of the unknown symbol immediately following the DL symbol in the slot in which the physical data channel of the terminal is scheduled plus the number of gap symbols. The number of gap symbols is determined based on a TA (timing advance) value and the length of the OFDM symbol. In yet another specific embodiment, the number of gap symbols is set by the base station. Also, if the DL data channel is scheduled to the unknown symbol, the terminal regards the unknown symbol as a DL symbol. Also, if the UL data channel is scheduled to the unknown symbol, the terminal regards the unknown symbol as a UL symbol.

[0259] In addition, when the DCI schedules the transmission of the physical data channel of the terminal, the terminal does not expect that the first OFDM symbol and the last OFDM symbol of the time-frequency resource for which the transmission of the physical data channel of the terminal is scheduled are located in different slots. In particular, the terminal determines the last OFDM symbol of the time-frequency resource for which the transmission of the physical data channel of the terminal is scheduled to be the last OFDM symbol of the slot in which the start OFDM symbol of the time-frequency resource for which the transmission of the physical data channel of the terminal is scheduled is located, or the symbol before the last OFDM symbol. For example, the number of OFDM symbols included in the slot is 14, and the DCI indicates that the last OFDM symbol of the time-frequency resource for which the transmission of the physical data channel of the terminal is scheduled is the 7th OFDM symbol. In this case, if the number of OFDM symbols occupied by the time-frequency resource for which the transmission of the physical data channel of the terminal indicated by the DCI is scheduled is 7, the terminal determines that the OFDM symbols for which the transmission of the physical data channel of the terminal is scheduled are from the 7th OFDM symbol to the 14th OFDM symbol. In the above embodiment, the physical data channel transmitted by the terminal is the PUSCH.

[0260] In the above embodiments, the physical data channel includes a PDSCH or a PUSCH, and the physical control channel includes a PDCCH or a PUCCH. In addition, in the embodiments described above using PUSCH, PDCCH, PUCCH, and PDCCH as examples, other types of data channels and control channels may also be applied.

[0261] Although the method and system of the present invention have been described with respect to particular embodiments, some or all of its components or operations may be implemented using a computing system having a general-purpose hardware architecture.

[0262] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, the above-described embodiments are illustrative and restrictive in all respects. For example, each component described as a single type may be implemented in a distributed form, and each component described as a distributed form may be implemented in a combined form.

[0263] The scope of the present invention is indicated by the claims set forth below rather than by the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0264] 110 Processor 121 Cellular communication interface card (first frequency band) 122 Cellular communication interface card (second frequency band) 123 Wireless LAN interface card (second frequency band) 130 Memory 140 User Interface 150 display units 210 Processor 221 Cellular communication interface card (first frequency band) 222 Cellular communication interface card (second frequency band) 223 Wireless LAN Interface Card (2nd Frequency Band) 230 Memory

Claims

1. A terminal of a wireless communication system, the terminal comprising: A communication module; a processor configured to control the communication module; The processor, receiving a radio resource control (RRC) signal from a base station of the wireless communication system via the communication module; determining a first time-frequency resource corresponding to at least one resource-set indicated by the RRC signal, the at least one resource-set being identified by different indexes; receiving a physical control channel from the base station via the communication module; determining a second time-frequency resource on which the terminal is scheduled to receive a physical data channel by the physical control channel, the first time-frequency resource overlapping the second time-frequency resource, the overlapping time-frequency resource including a plurality of sub-resource-sets; A rate matching indicator is obtained from a downlink control information (DCI) field of the physical control channel, the rate matching indicator includes a plurality of bits, each of the plurality of bits indicates whether the physical data channel is not receivable for each of the plurality of sub-resource sets, and a bit indicating a sub-resource set included in a specific resource set among the plurality of bits of the rate matching indicator is determined based on an index of the specific resource set; receiving the physical data channel according to the rate matching indicator; The resource-set is a set of time-frequency resources. A terminal configured to:

2. The terminal described in claim 1, wherein the sub-resource sets are divided among the overlapping time-frequency resources based on the frequency domain without any division in the time domain.

3. The terminal of claim 1, wherein if the second time-frequency resource and the at least one resource set do not overlap, the processor is configured to receive the physical data channel on the second time-frequency resource regardless of the rate matching indicator.

4. The physical control channel is received in a first slot, If a second time-frequency resource overlaps with the at least one resource set in a second slot in which the physical data channel is received, the processor is configured to perform rate matching for receiving the physical data channel on time-frequency resources other than the time-frequency resource on which the physical data channel is scheduled in the second slot and the time-frequency resource on which the at least one resource set overlaps; The first slot and the second slot are different slots. The terminal according to claim 1.

5. A method for operating a terminal of a wireless communication system, the method comprising: receiving a radio resource control (RRC) signal from a base station of the wireless communication system; determining a first time-frequency resource corresponding to at least one resource-set indicated by the RRC signal, the at least one resource-set being identified by different indexes; receiving a physical control channel from the base station; determining a second time-frequency resource on which the terminal is scheduled to receive a physical data channel by the physical control channel, the first time-frequency resource overlapping the second time-frequency resource, the overlapping time-frequency resource including a plurality of sub-resource-sets; obtaining a rate matching indicator from a downlink control information (DCI) field of the physical control channel, the rate matching indicator including a plurality of bits, each of which indicates whether reception of the physical data channel is possible for each of the plurality of sub-resource sets, and a bit indicating a sub-resource set included in a specific resource set among the plurality of bits of the rate matching indicator is determined based on an index of the specific resource set; receiving the physical data channel according to the rate matching indicator; Including, A method of operation, wherein the resource set is a set of time-frequency resources.

6. The operating method described in claim 5, wherein the sub-resource sets are divided among the overlapping time-frequency resources based on the frequency domain without any division in the time domain.

7. An operating method as described in claim 5, wherein the step of receiving the physical data channel includes a step of receiving the physical data channel on the second time-frequency resource regardless of the rate matching indicator if neither the second time-frequency resource nor the at least one resource set overlaps.

8. The physical control channel is received in a first slot; The step of receiving the physical data channel includes, if the at least one resource set overlaps with a second time-frequency resource in a second slot in which the physical data channel is received, performing rate matching to receive the physical data channel on time-frequency resources other than the time-frequency resources on which the physical data channel is scheduled in the second slot and the time-frequency resources on which the at least one resource set overlaps; The first slot and the second slot are different slots.

6. The method of claim 5.

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