Data transmission method and reception method for wireless communication system, and apparatus using the 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. More specifically, the present invention relates to a data transmission method, a reception method, and an apparatus using the same in a wireless communication system.

Background Art

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

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

[0004] For more efficient data processing, the dynamic TDD of the NR system uses a method of varying the number of OFDM (orthogonal frequency division multiplexing) symbols that can be used for the uplink and downlink according to the data traffic direction of the users in the cell. For example, if the downlink traffic in the cell is more than the uplink traffic, the base station allocates a large number of downlink OFDM symbols to the slot (or subframe). Information regarding the slot configuration should be transmitted to the terminal.

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

[0006] On the other hand, the Internet is evolving from a human-centered connection network where humans generate and consume information to an IoT (Internet of Things) network that exchanges and processes information among distributed components such as things. IoE (Internet of Everything) technology, which combines big data processing technology and others through connection with cloud servers and the like, is also emerging. To implement IoT, technical elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, technologies such as sensor networks, machine to machine (M2M), and MTC (machine type communication) for connecting things have been studied. In the IoT environment, intelligent IT (internet technology) services that collect and analyze data generated from connected things to create new value for human life are provided. 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 integration and combination of conventional IT technologies and various industries.

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

[0008] However, mobile communication systems have gradually expanded their service areas to include not only voice but also data services, and have now evolved to the extent of providing high-speed data services. However, in the currently operating mobile communication systems, due to resource shortages and the demand for high-speed services from users, a more advanced mobile communication system is required.

Summary of the Invention

Problems to be Solved by the Invention

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

Means for Solving the Problems

[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 an RRC (radio resource control) signal from a base station of the wireless communication system via the communication module, determines time-frequency resources 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 reception of a physical data channel of the terminal is scheduled by the physical control channel, and receives the physical data channel based on time-frequency resources in which reception of the physical data channel of the terminal is scheduled and time-frequency resources in which the at least one resource-set overlaps. At this time, 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. The processor obtains a rate matching indicator indicating whether reception of the physical data channel is impossible for each of the plurality of sub-resource-sets from the physical control channel, determines whether reception of the physical data channel is impossible in time-frequency resources corresponding to the sub-resource-sets for each of the sub-resource-sets based on the rate matching indicator, and receives the physical data channel.

[0012] The sub-resource-set is divided based on a frequency domain without division in a time domain among the overlapping time-frequency resources.

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

[0014] If neither the time-frequency resource in which the physical data channel reception of the terminal is scheduled nor the at least one resource set overlaps, the processor receives the physical data channel in the time-frequency resource region in which the physical data channel reception of the terminal is scheduled, regardless of the rate matching indicator.

[0015] The physical control channel is received in the first slot. If the time-frequency resource in which the physical data channel is scheduled and the at least one resource set overlap in the second slot in which the physical data channel is received, the processor excludes from the time-frequency resource in which the physical data channel is scheduled in the second slot the time-frequency resource in which the time-frequency resource in which the physical data channel is scheduled and the at least one resource set overlap, and performs rate matching for receiving the physical data channel in the remaining time-frequency resource. At this time, the first slot and the second slot are different slots from each other.

[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 receives a physical control channel, and if the reception of the physical data channel of the terminal is scheduled in a plurality of slots by the physical control channel, the processor receives the physical data channel based on the positions of the same OFDM (orthogonal frequency division multiplexing) symbols in all the slots in which the physical data channel is transmitted.

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

[0018] In each of the plurality of slots, the positions of the time-frequency resources corresponding to a resource-set in which reception of the physical data channel is not possible are the same. The processor performs rate matching for receiving the physical data channel with the time-frequency resources obtained by removing, from the time-frequency resources corresponding to the physical data channel scheduled in each of the plurality of slots, the time-frequency resources corresponding to the positions.

[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: 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 reception of a physical data channel of the terminal is scheduled by the physical control channel; and receiving a physical data channel based on time-frequency resources in which reception of the physical data channel of the terminal is scheduled and time-frequency resources in which the at least one resource set overlaps. The resource set is 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 reception of a physical data channel of the terminal is scheduled by the physical control channel includes obtaining a rate matching indicator indicating whether reception of the physical data channel is impossible for each of the plurality of sub-resource sets from the physical control channel. The step of receiving the physical data channel includes determining whether reception of the physical data channel is impossible in time-frequency resources 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 set is divided based on a frequency domain without division in a time domain among the overlapping time-frequency resources.

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

[0024] The step of receiving the physical data channel includes receiving the physical data channel in a time-frequency resource region where the physical data channel of the terminal is scheduled to be received, regardless of the rate matching indicator, if the time-frequency resource in which the physical data channel reception of the terminal is scheduled and the at least one resource-set do not overlap at all.

[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 obtained by excluding, from the time-frequency resource in which the physical data channel is scheduled in a second slot where the physical data channel is transmitted, a time-frequency resource in which the time-frequency resource in which the physical data channel is scheduled and the at least one resource-set overlap, if the time-frequency resource in which the physical data channel is scheduled in the second slot where the physical data channel is transmitted and the at least one resource-set overlap. The first slot and the second slot are different slots from each other.

[0026] A method for operating a terminal in a wireless communication system according to an embodiment of the present invention includes receiving a physical control channel, and receiving the physical data channel based on positions of the same OFDM symbols in all slots in which the physical data channel is transmitted, if reception of the physical data channel of the terminal is scheduled in a plurality of slots by the physical control channel.

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

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

[0029] In each of the plurality of slots, the positions of the time-frequency resources corresponding to the resource sets in which reception of the physical data channel is impossible are the same. The step of receiving the physical data channel includes performing rate matching for receiving the physical data channel with time-frequency resources obtained by removing, from the time-frequency resources corresponding to the physical data channel scheduled in each of the slots, the time-frequency resources corresponding to the positions.

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

Advantages of the Invention

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

[0032] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned should be clearly understood by those with ordinary knowledge in the technical field to which the present invention pertains from the following description.

Brief Description of the Drawings

[0033]

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Embodiments for Carrying Out the Invention

[0034] The terms used in this specification are selected to be as general as currently widely used, taking into account the functions in the present invention, but they may vary depending on the intentions, conventions of those skilled in the art, or the emergence of new technologies. In some specific cases, there are also those arbitrarily selected by the applicant, and in such cases, the meaning is described in the corresponding invention description part. Therefore, it is clarified that the terms used in this specification should be analyzed based not only on the mere names of the terms but also on the substantial meanings they have and the content throughout this specification.

[0035] Throughout the specification, when it is stated that one configuration is "connected" to another configuration, this includes not only the case where they are "directly connected" but also the case where they are "electrically connected" via other intervening components. Also, when it is stated that one configuration "includes" a specific component, this means that, unless otherwise stated to the contrary, it does not exclude other components but further includes other components. In addition, the limiting terms "above" or "below" based on a specific threshold may be appropriately replaced by "more than" or "less than" respectively according to the embodiments.

[0036] The following technologies are used in various wireless connection systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. CDMA is implemented with radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented with radio technologies such as GSM (registered trademark) (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM (registered trademark) Evolution). OFDMA is implemented with radio technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunication System). 3GPP LTE (Long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A and is a system for supporting 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 the sake of clarity, the description will focus on 3GPP NR, but the technical idea of the present invention is not limited to this.

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

[0038] Referring to FIG. 1, the radio frame (or radio frame) used in the 3GPP NR system has a length of 10 ms (Δf max N f / 100)*T c ). Also, the radio frame consists of 10 subframes (subfame, SF) of equal size. 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 each given numbers 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 factor and has values of μ = 0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. The 1 ms long subframe consists of 2 μ slots. At this time, the length of each slot is 2 -μ ms. The 2 μ slots in one subframe are each given numbers from 0 to 2 μ - 1. Also, the slots in one radio frame are each given numbers from 0 to 10*2 μNumbers up to -1 are assigned. The time resource is divided by at least one of a radio frame number (or also referred to as a radio frame index), a subframe number (or also referred to as a subframe index), and a slot number (or slot index).

[0039] FIG. 2 is a diagram showing an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 shows the resource grid structure of a 3GPP NR system.

[0040] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol interval. Unless otherwise specified, an OFDM symbol is simply referred to as a symbol. 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 OFDM symbols and is represented by a resource grid. Here, if it is a downlink resource grid, x = DL, and if it is an uplink resource grid, x = UL. N size、μ grid、x indicates the number of resource blocks (RBs) according to the subcarrier spacing configuration factor μ (x is DL or UL), and N slot symb indicates the number of OFDM symbols in a slot. N RB SC is the number of subcarriers constituting one RB, and N RB SCIt is 12. An OFDM symbol is referred to as a CP-OFDM (cyclic prefix OFDM) symbol or a DFT-S-OFDM (discrete Fourier transform spread OFDM) symbol by a multiple access method.

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

[0042] One RB is defined by N RB SC (for example, 12) consecutive subcarriers in the frequency domain. Incidentally, a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or a tone. Therefore, one RB consists of N slot symb *N RB SC resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) within one slot. k is from 0 to N in the frequency domain size、μgrid、x *N RB SC is an index given up to -1, and l is from 0 to N in the time domain slot symb is an index given 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 that of the base station. This is because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters necessary to perform demodulation of the DL signal and transmission of the UL signal at the correct time.

[0044] Each symbol of a radio frame operating in TDD (time division duplex) or unpaired spectrum consists of at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. A radio frame operating on a downlink carrier in FDD (frequency division duplex) or paired spectrum consists of a downlink symbol or a flexible symbol, and a radio frame operating on an uplink carrier consists of an uplink symbol or a flexible symbol. Downlink transmission is possible in a downlink symbol but uplink transmission is not, and uplink transmission is possible in an uplink symbol but downlink transmission is not. For a flexible symbol, it is determined whether it is used for downlink or uplink according to the signal.

[0045] The information regarding the type of each symbol, i.e., the information indicating any one of a downlink symbol, an uplink symbol, and a flexible symbol, consists of cell-specific or common RRC signals. Also, the information regarding the type of each symbol consists of additional UE-specific or dedicated RRC signals. The base station uses the cell-specific RRC signal to inform 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 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 UE-specific RRC signals, 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 slot and the number of uplink symbols among the N slot symb symbols of the slot. At this time, the downlink symbols of the slot are continuously configured from the first symbol to the i-th symbol of the slot. Also, the uplink symbols of the slot are continuously configured from the j-th symbol to the last symbol of the slot (where i < j). In a slot, a symbol not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0047] The type of symbol consisting of the RRC signal as described above is referred to as a semi-static DL / UL configuration. In the semi-static DL / UL configuration consisting of the RRC signal described above, the flexible symbol is indicated as a downlink symbol, an uplink symbol, or a flexible symbol via the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, the downlink symbol or uplink symbol consisting of the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI indicated 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, a maximum of two DL / UL switchings are allowed in one slot.

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

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

[0052] After the terminal finishes the initial cell search, it receives the physical downlink shared channel (PDSCH) based on the physical downlink control channel (PDCCH) and the information carried on the PDCCH, so as to obtain more detailed system information than the system information acquired through the initial cell search (S102). Here, the system information transmitted to the terminal is cell-common system information for the terminal to operate correctly at the physical layer in the radio resource control (RRC), and is also referred to as remaining system information or system information block (SIB) 1.

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

[0054] The RRC layer is used for generating and managing messages for controlling between the terminal and the radio access network (RAN). More specifically, the base station and the terminal perform storage management including broadcasting of cell system information necessary for all terminals in the cell, transmission management of paging messages, mobility management and handover, measurement reporting of the terminal and control thereof, terminal capability management and opportunity management at the RRC layer. Generally, since the update of the signal transmitted at the RRC layer (hereinafter, RRC signal) is longer than the transmission and reception cycle (i.e., transmission time interval, TTI) at the physical layer, the RRC signal is maintained without change for a long period.

[0055] After the above-described procedure, the terminal performs PDCCH / PDSCH reception S107 and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general uplink / downlink signal transmission procedure S108. In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. Also, the DCI may have different formats depending on the 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, CQI (channel quality indicator), PMI (precoding matrix index), RI (rank indicator), and the like. Here, CQI, PMI, and RI are included in CSI (channel state information). In the case of the 3GPP NR system, the terminal transmits control information such as the above-described HARQ-ACK and CSI via the PUSCH and / or PUCCH.

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

[0057] When the terminal is powered on or attempts to newly access a cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. The terminal detects the physical cell identity N of the cell during the cell search process. For this purpose, the terminal receives synchronization signals, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station. At this time, the terminal acquires information such as the cell identity (ID). cell ID To do this, the terminal receives synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from the base station to synchronize with the base station. At this time, the terminal obtains information such as the cell identifier (identity, ID).

[0058] Referring to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into a PSS and an SSS. The PSS is used to obtain time domain synchronization such as OFDM symbol synchronization and slot synchronization and / or frequency domain synchronization. The SSS is used to obtain frame synchronization and cell group ID. Referring to FIG. 4(a) and Table 2, the SS / PBCH block consists of 20 RBs (= 240 subcarriers) continuous on the frequency axis and 4 OFDM symbols continuous on the time axis. At this time, in the SS / PBCH block, the PSS is transmitted via the first OFDM symbol, and the SSS is transmitted via the 3rd OFDM symbol through subcarriers 56 to 182. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol where the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, that is, subcarriers 0 to 55 and 183 to 239. Also, in the 3rd OFDM symbol where 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 PBCH (physical broadcast channel) via the remaining REs except for the above signals in the SS / PBCH block.

[0059]

Table 2

[0060] SS has a total of 1008 unique physical layer cell identifiers through a combination of three PSSs and SSSs. Specifically, each physical layer cell ID is grouped into 336 physical - layer cell - identifier groups, with each group containing three unique identifiers such that each physical layer cell ID is part of exactly one physical - layer cell - identifier group. Thus, the physical layer cell ID N cell ID = 3N (1) ID + N (2) ID is the index N within the range from 0 to 335 indicating the physical - layer cell - identifier group (1) ID and the index N within the range from 0 to 2 indicating the physical - layer identifier within the said physical - layer cell - identifier group (2) ID and is uniquely defined by them. The terminal detects the PSS and identifies one of the three unique physical - layer identifiers. Also, the terminal detects the SSS and identifies one of the 336 physical layer cell IDs associated with the said physical - layer identifier. At this time, the sequence d PSS (n) is as follows.

[0061]

Equation

Equation

Equation

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

[0063] [Number] Here,[ [Number] and [Number] is given to.

[0064] A 10-ms long radio frame is divided into two half-frames each 5 ms long. Referring to FIG. 4(b), the slot in each half-frame in which the SS / PBCH block is transmitted will be described. The slot in which the SS / PBCH block is transmitted is one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0, 1. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case B, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1. In case C, the subcarrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n-th symbol. At this time, at carrier frequencies below 3 GHz, n = 0, 1. Also, at carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case D, the subcarrier spacing is 120 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n-th symbol. At this time, at carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the subcarrier spacing is 240 kHz, and the start point of the SS / PBCH block is the {8, 12, 16, 20, 32, 36, 40, 44}+56*n-th symbol. At this time, at carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

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

[0066] FIG. 6 is a diagram showing a CORESET in which 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. Also, a search space, which will be described later, is mapped to one CORESET. Therefore, instead of monitoring all frequency bands to receive a PDCCH, a terminal monitors a CORESET and a designated time - frequency region to decode the PDCCH mapped to the CORESET. A base station configures one or more CORESETS for each cell for the terminal. A CORESET consists of up to three consecutive symbols on the time axis. Also, a CORESET consists of a unit of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 5, CORESET #1 consists of consecutive PRBs, and CORESET #2 and CORESET #3 consist of non - consecutive PRBs. A CORESET can be located in any symbol within a slot. For example, in the embodiment of FIG. 5, CORESET #1 starts from the first symbol of the slot, CORESET #2 starts from the fifth symbol of the slot, and CORESET #9 starts from the ninth symbol of the slot.

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

[0069] To transmit PDCCH to a terminal, at least one or more search spaces exist in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) where the terminal's PDCCH is transmitted. The search space includes a common search space that all 3GPP NR terminals should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in cells belonging to the same base station monitor PDCCH that is set to be commonly searched. Also, the terminal-specific search space is set for each terminal to monitor the PDCCH assigned to each terminal at different search space positions according to the terminal. In the case of the terminal-specific search space, due to the restricted control region where the PDCCH is assigned, the search spaces between terminals may be assigned with partial overlap. Monitoring the PDCCH includes blindly decoding PDCCH candidates in the search space. When the blind decoding is successful, it is expressed that the PDCCH is (successfully) detected / received, and when the blind decoding fails, it is expressed that the PDCCH is not detected / not received, or not successfully detected / received.

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

[0071] The base station notifies each terminal or terminal group of information regarding resource allocation of the PCH (paging channel) and DL-SCH (downlink-shared channel), which are transmission channels, via the PDCCH (i.e., DL Grant), or information regarding resource allocation and HARQ (hybrid automatic repeat request) of the UL-SCH (uplink-shared channel) (i.e., UL Grant). The base station transmits the PCH transmission block and the DL-SCH transmission block via the PDSCH. The base station transmits data except for specific control information or specific service data via the PDSCH. Also, the terminal receives data except for specific control information or specific service data via the PDSCH.

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

[0073] Table 3 shows an example of the 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: Response to the PDCCH (indicating DL SPS release) and / or response to the uplink transport block (TB) on the PDSCH. HARQ-ACK indicates the reception status of the information transmitted via the PDCCH or PDSCH. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK, ACK / NACK. Generally, ACK is represented by the bit value 1, and NACK is represented by the bit value 0.

[0078] - CSI: Feedback information for the downlink channel. It is generated by the terminal based on the CSI-RS (Reference Signal) transmitted by the base station. MIMO (multiple input multiple output)-related feedback information includes RI and PMI. CSI is divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

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

[0080] PUCCH format 0 is a format for transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted via one or two OFDM symbols on the time axis and one PRB on the frequency axis. If PUCCH format 0 is transmitted using two OFDM symbols, the same sequence is transmitted on different RBs for the two symbols. At this time, the sequence is a sequence that has been cyclically shifted (CS) from the base sequence used for PUCCH format 0. Through this, the terminal obtains a frequency diversity gain. Specifically, the terminal is M bit bits UCI (M bit = 1 or 2) to determine the cyclic shift (CS) value m cs and determines a cyclic shift sequence based on the determined CS value m cs with a base sequence of length 12 and maps it to 12 REs of one OFDM symbol and one RB for transmission. The number of available cyclic shifts for the terminal is 12. If M bit = 1, 1-bit UCI0 and 1 are each mapped to two cyclically shifted sequences with a cyclic shift value difference of 6. Also, if M bit = 2, 2-bit UCI00, 01, 11, 10 are each mapped to four cyclically shifted sequences with a cyclic shift value difference of 3.

[0081] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, UCI with M bit = 1 is modulated by BPSK. The terminal is M bitThe UCI with a value of 2 is modulated by QPSK (quadrature phase shift keying). A sequence of length 12 is multiplied by the modulated complex valued symbol d(0) to obtain a signal. At this time, the sequence is the base sequence used for PUCCH format 0. The terminal spreads the obtained signal with a time-axis OCC (orthogonal cover code) on the even-numbered OFDM symbols to which PUCCH format 1 is allocated and transmits it. PUCCH format 1 determines the maximum number of different terminals multiplexed in the same RB according to the length of the OCC used. The DMRS (demodulation reference signal) is spread and mapped with the OCC on the odd-numbered OFDM symbols of PUCCH format 1.

[0082] PUCCH format 2 transmits UCI exceeding 2 bits. PUCCH format 2 is transmitted via one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted with two OFDM symbols, the same sequence is transmitted on different RBs via the two OFDM symbols. Here, the sequence is a plurality of modulated complex valued symbols d(0), …, d(M symbol -1). Here, M symbol is M bit / 2. Through this, the terminal obtains a frequency diversity gain. More specifically, the M bit -bit UCI (M bit >2) is bit-level scrambled, QPSK modulated, and mapped to the RB(s) of one or two OFDM symbol(s). Here, the number of RBs is one of 1 to 16.

[0083] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via OFDM symbols continuous in the time domain and one PRB in the frequency domain. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. Specifically, the terminal is M bit bit UCI (M bit >2) is modulated by π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(M symb -1). Here, when using π / 2-BPSK, M symb = M bit and when using QPSK, M symb = M bit / 2. The terminal does not apply block-unit spreading to PUCCH format 3. However, the terminal may apply block-unit spreading to one RB (i.e., 12 subcarriers) using a length-12 PreDFT-OCC so that PUCCH format 4 has two or four multiplexing capacities. The terminal transmit precodes (or DFT-precodes) the spread signal, maps it to each RE, and transmits the spread signal.

[0084] At this time, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of the UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via PUCCH. If the number of RBs that the terminal can transmit is larger 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] The RRC signal is configured such that PUCCH format 1, PUCCH format 3, or PUCCH format 4 indicates frequency hopping within a slot. When frequency hopping is configured, the index of the RBs that perform frequency hopping is from the RRC signal. 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. At this time, the number K of slots in which the PUCCH is repeatedly transmitted is configured by the RRC signal. The repeatedly transmitted PUCCH should start from the OFDM symbol at the same position within each slot and have the same length. If any one of the OFDM symbols of the slot in which the terminal should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the terminal does not transmit the PUCCH from the corresponding slot and defers the transmission to the next slot.

[0087] On one hand, in the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or equal to the bandwidth of the carrier (or cell). For this purpose, the terminal constitutes a BWP (bandwidth part) consisting of a part of the continuous bandwidth within the carrier bandwidth. A terminal operating according to TDD or operating in an unpaired spectrum can constitute a maximum of 4 DL / UL BWP pairs for one carrier (or cell). Also, the terminal activates one DL / UL BWP pair. A terminal operating according to FDD or operating in a paired spectrum can constitute a maximum of 4 DL BWPs for the downlink carrier (or cell) and a maximum of 4 UL BWPs for the uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal may not receive from or transmit to time-frequency resources other than the activated BWP. The activated BWP is called the active BWP.

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

[0089] Figure 8 is a conceptual diagram for explaining carrier aggregation.

[0090] Carrier aggregation means that, in order for a wireless communication system to use a wider frequency band, a terminal uses a frequency block consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers), or a plurality of cells (in the logical sense) in one large logical frequency band. One component carrier is referred to by terms such as PCell (Primary cell), SCell (Secondary Cell), or PSCell (Primary SCell). However, hereinafter, for convenience of explanation, the term "component carrier" will be unified.

[0091] Referring to FIG. 8, as an example of a 3GPP NR system, the overall system bandwidth includes a maximum of 16 component carriers, and each component carrier has a bandwidth of up to 400 MHz. A component carrier includes one or more physically contiguous subcarriers. In FIG. 8, each component carrier is shown as having the same bandwidth, but this is only an example, and each component carrier may have a different bandwidth from each other. Also, each component carrier is shown as being adjacent to each other on the frequency axis, but the drawing shows a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

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

[0093] If the overall system bandwidth is extended by carrier aggregation, the frequency bands used for communication with each terminal are defined in component carrier units. Terminal A uses the entire 100 MHz system bandwidth 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 or may not be logically / physically adjacent. In the example of FIG. 8, a case is shown where Terminal C1 uses two non-adjacent component carriers and Terminal C2 uses two adjacent component carriers.

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

[0095] Referring to FIG. 9(a), in a general wireless communication system, data is transmitted or received through one DL band and its corresponding one UL band in the case of the FDD mode. In other specific embodiments, in the case of the TDD mode, the wireless frame is divided into an uplink time unit and a downlink time unit in the time domain, and data is transmitted or received 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, and a 60 MHz bandwidth is supported. Each CC may or may not be adjacent to each other in the frequency domain. FIG. 9(b) shows the case where, for the sake of convenience, the bandwidths of the UL CC and the DL CC are the same and symmetric, but the bandwidth of each CC may be determined independently. Also, an asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CC allocated / configured to a specific terminal via RRC is referred to as the serving DL / UL CC of the specific terminal.

[0096] The base station communicates with the terminal by activating some or all of the serving CCs of the terminal or deactivating some of the CCs. The base station may change the CCs to be activated / deactivated or change the number of CCs to be activated / deactivated. When the base station assigns the CCs available to the terminal cell-specifically or terminal-specifically, at least one of the once-assigned CCs does not have to be deactivated unless the CC assignment for the terminal is completely reconfigured or the terminal does not perform a handover. One CC that is not deactivated for the terminal is called the primary CC (PCC) or the primary cell (PCell), and the CC that the base station can freely activate / deactivate is called the secondary CC (SCC) or the secondary cell (SCell).

[0097] On the other hand, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of downlink resources and uplink resources, that is, a combination of a DL CC and a UL CC. A cell consists of DL resources alone or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resources (or DL CC) and the carrier frequency of the UL resources (or UL CC) is indicated by the system information. The carrier frequency means the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in the downlink is the DL PCC, and the carrier corresponding to the PCell in the uplink is the UL PCC. Similarly, the carrier corresponding to the SCell in the downlink is the DL SCC, and the carrier corresponding to the SCell in the uplink is the UL SCC. Depending on the terminal capacity, the serving cell(s) consists of one PCell and zero or more SCells. For a UE in the RRC_CONNECTED state but with carrier aggregation not configured or not supporting carrier aggregation, there is only one serving cell consisting of only the PCell.

[0098] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" that refers to a certain geographical area where communication services are provided by one base station or one antenna group. That is, one component carrier is referred to by terms such as a scheduling cell, a scheduled cell, a PCell, an SCell, or a PSCell. However, in order to distinguish between the cell referring to a certain geographical area and the cell of carrier aggregation, in the present invention, the cell of carrier aggregation is referred to as a CC, and the cell of the geographical area is referred to as a cell.

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

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

[0101] On the other hand, although FIGS. 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, the same or similar configuration is applicable to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

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

[0103] As illustrated, a terminal 100 according to an 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 instructions or programs and processes data inside the terminal 100. Also, the processor 110 controls the overall operation including each unit of the terminal 100 and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present disclosure. For example, the processor 110 may receive slot configuration information, determine the configuration of the slot based on it, and perform communication according to the determined slot configuration.

[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, 122, and unlicensed band communication interface cards 123, in a built-in or external form. In the drawings, the communication module 120 is illustrated as an integrated module, but each network interface card may be arranged independently according to the circuit configuration or application, different from the drawings.

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

[0107] The cellular communication interface card 122 transmits and receives wireless signals with at least one of the base station 200, external device, and server via a mobile communication network, and provides a cellular communication service in a second frequency band based on the instructions of the processor 110. According to one embodiment, the cellular communication interface card 122 includes at least one NIC module that uses a frequency band of 6 GHz or more. At least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, external device, and server according to the cellular communication standard or protocol of the frequency band of 6 GHz or more supported by the corresponding NIC module.

[0108] The unlicensed band communication interface card 123 transmits and receives radio signals with at least one of the base station 200, external devices, and servers via a third frequency band that is an unlicensed band, and provides an unlicensed band communication service based on the instructions of the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band. 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, external devices, and servers 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 the control program used in the terminal 100 and various data thereby. Such a control program includes a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external devices, and servers.

[0110] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface unit 140 receives 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 an output based on the instructions of the processor 110 using various output means.

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

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

[0113] First, the processor 210 executes various instructions or programs and processes data inside the base station 200. Also, the processor 210 controls the overall operation including each unit of the base station 200 and controls the transmission and reception of data between 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, 222, and unlicensed band communication interface cards 223 in a built-in or external form. In the drawings, the communication module 220 is illustrated as an integrated module, but each network interface card may be arranged independently according to the circuit configuration or application, different from the drawings.

[0115] The cellular communication interface card 221 transmits and receives wireless signals with at least one of the terminal 100, external device, and server described above via a mobile communication network, and provides a cellular communication service in a first frequency band based on an instruction of the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 performs cellular communication with at least one of the terminal 100, external device, and server independently according to the cellular communication standard or protocol of the frequency band less than 6 GHz supported by the corresponding NIC module.

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

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

[0118] The terminal 100 and the base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present disclosure. The blocks shown separately logically distinguish the elements of the device. Therefore, the above-described elements of the device are mounted on one chip or a plurality of chips according to the design of the device. In addition, some configurations of the terminal 100, for example, the user interface unit 140 and the display unit 150, etc., may be selectively provided in the terminal 100. Also, the user interface 140 and the display unit 150, etc., may be additionally provided in the base station 200 if necessary.

[0119] FIG. 12 is a diagram showing 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 (Resource Set, RESET), which is a set of time-frequency resources for instructing whether a terminal can use them for receiving a physical data channel. Specifically, the base station uses a resource set for signaling time-frequency resources that a terminal cannot use for receiving a physical data channel. The terminal determines time-frequency resources corresponding to at least one RESET via an RRC signal for at least initial cell access. In a specific embodiment, the base station uses a field of DCI to indicate which RESETs the terminal cannot use for receiving a physical data channel. For convenience of explanation, a field of DCI for indicating whether a RESET is available for receiving a physical data channel is referred to as a RESET field. If rate matching is used for receiving a physical data channel, the RESET field is referred to as a rate-matching indicator. Also, if puncturing is used for receiving a physical data channel, the RESET field is referred to as a puncturing indicator. The base station uses an RRC signal to indicate one or more RESETs. Specifically, the base station uses an RRC signal to indicate time-frequency resources corresponding to the RESET. Also, the base station uses L1 signaling or DCI for scheduling a physical data channel to indicate whether one or more RESETs are not available for receiving a physical data channel. At this time, the base station uses an RRC signal to signal the length of a field of DCI for indicating whether one or more RESETs are available for receiving a physical data channel. Also, depending on the RESET setting of the base station, the RESET includes all or part of the above-described CORESET. Specifically, the RESET is specified in units of CORESET. For example, the RESET may be specified in units of a single CORESET or a plurality of CORESETs.

[0121] The terminal receives the physical data channel based on the time-frequency resources where the reception of the physical data channel of the terminal is scheduled and the time-frequency resources corresponding to the RESET indicated as unavailable for the reception of the physical data channel overlap. At this time, the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled are indicated by the DCI of the physical control channel for the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled. Specifically, the DCI that schedules the physical data channel indicates to the terminal the time-frequency resources in which the reception of the physical data channel is scheduled through the time-domain information and frequency-domain information of the time-frequency resources in which the reception of the physical data channel is scheduled. At this time, the time-domain information includes the index of the start OFDM symbol of the slot in which the reception of the physical data channel is scheduled. Also, the DCI that schedules the physical data channel indicates the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled using the information indicating the frequency band in which the reception of the physical data channel of the terminal is scheduled. At this time, the information indicating the frequency band in which the reception of the physical data channel is scheduled is indicated in units of PRBs or PRB groups. Specifically, the terminal determines as the resources for receiving the physical data channel the remaining time-frequency resources excluding the RESET indicated as unavailable for the reception of the channel among the time-frequency resources in which the reception of the physical data channel is scheduled. The terminal determines the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled by the DCI that schedules the physical data channel. Through this, the terminal determines the time-frequency resources in which the time-frequency resources corresponding to the RRC signal and the set RESET overlap with the time-frequency resources in which the reception of the physical data channel indicated by the DCI is scheduled.For the sake of convenience in explanation, a time-frequency resource corresponding to RESET set in a terminal and a time-frequency resource in which reception of a physical data channel is scheduled are overlapped, and this overlapped time-frequency resource is referred to as an overlapped-resource set (overlapped-RESET). If the time-frequency resource corresponding to RESET available for reception of a physical data channel and the time-frequency resource in which reception of the physical data channel is scheduled do not overlap, the terminal determines that it is possible to receive the physical data channel using all of the time-frequency resources in which reception of the physical data channel is scheduled. Specifically, if the time-frequency resource corresponding to RESET available for reception of a physical data channel and the time-frequency resource in which reception of the physical data channel is scheduled 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. At this time, the terminal performs rate matching using the time-frequency resources excluding the time-frequency resource corresponding to RESET in which the RESET field indicates that reception of the physical data channel is impossible in the time-frequency resources in which the physical data channel is scheduled, and receives the physical data channel. In other specific embodiments, if the time-frequency resource corresponding to RESET unavailable for reception of a physical data channel and the time-frequency resource in which reception of the physical data channel is scheduled overlap, the terminal performs puncturing based on the RESET field. At this time, the terminal punctures the time-frequency resource corresponding to RESET in which the RESET field indicates that reception of the physical data channel is impossible in the time-frequency resources in which the physical data channel is scheduled, and receives the physical data channel. Also, if the time-frequency resource corresponding to RESET unavailable for reception of a physical data channel and the time-frequency resource in which reception of the physical data channel is scheduled do not overlap, the terminal determines that it is possible to receive the physical data channel using all of the time-frequency resources in which reception of the physical data channel is scheduled regardless of the value of the RESET field.

[0122] According to the above description, time-frequency resources that cannot be used for receiving a physical data channel are set in the terminal according to an RRC signal, and the terminal determines time-frequency resources that are actually unusable for receiving the physical data channel among the corresponding time-frequency indicated by DCI. If the base station sets time-frequency resources that cannot be used for receiving the physical data channel only by the RRC signal, since the usability of the resources changes as time passes, there is a possibility that the corresponding resources cannot always be used even when the resources are actually available for receiving the physical data channel. Therefore, there is a risk of reducing the frequency capacity (special efficiency). If the base station indicates time-frequency resources that should not be used for receiving the physical data channel only by DCI, the base station has to signal all information regarding time-frequency resources where reception of the physical data channel is impossible each time via DCI, so there is a risk of increasing 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 via a combination of 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 time-frequency resource in which the PDSCH reception of the terminal is scheduled by DCI overlaps with a part of the first RESET (RESET#1). Therefore, the terminal determines that a time-frequency resource in which the PDSCH reception of the terminal is scheduled by DCI overlaps with the first RESET (RESET#1) as an overlap-resource-set. In the embodiment of FIG. 12(b), a time-frequency resource in which the PDSCH reception of the terminal is scheduled by DCI overlaps with a part of the first RESET (RESET#1). Also, a time-frequency resource in which the PDSCH reception of the terminal is scheduled by DCI overlaps with a part of the second RESET (RESET#2). Therefore, the terminal determines that a time-frequency resource in which the PDSCH reception of the terminal is scheduled by DCI overlaps with the first RESET (RESET#1) and the second RESET (RESET#2) respectively as an overlap-resource-set.

[0124] The terminal may not be able to determine the time-frequency resources occupied by a RESET not configured for the terminal in the current slot, or can only be determined via separate signaling. Also, it may be difficult for the terminal to determine whether a RESET configured for the terminal in a future slot can receive a physical data channel. Further, it may be difficult for the terminal to determine the time-frequency resources occupied by the physical control channel dynamically allocated to the CORESET included in the RESET configured for the terminal in a future slot. Ultimately, it may be difficult for the terminal to determine the time-frequency resources for which the terminal should receive a 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 begins from the base station. Specifically, the terminal receives the start symbol information from the base station via DCI that schedules the physical data channel. If there are K positions of the OFDM symbol at which the transmission of the physical data channel can start and be specified, the base station transmits the start symbol information using ceil(log2K) bits. At this time, ceil(x) indicates the smallest integer among the numbers equal to or larger than x. At this time, the start symbol is specified for each slot. Also, the terminal determines the position of the OFDM symbol at which the transmission of the physical data channel begins based on the start symbol information. For example, if the start symbol and the specifiable OFDM symbols are any one of the first to fourth OFDM symbols of a slot, the base station transmits the start symbol information using 2 bits of the DCI. At this time, if the 2-bit value corresponding to the start symbol information of the DCI is 00 b then the terminal determines the start symbol as the first OFDM symbol of the slot. Also, if the 2-bit value corresponding to the start symbol information of the DCI is 01 b then the terminal determines the start symbol as the second OFDM symbol of the slot. Also, if the 2-bit value corresponding to the start symbol information of the DCI is 10 b then the terminal determines the start symbol as the third OFDM symbol of the slot. Also, if the 2-bit value 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 the physical data channel based on the start symbol information. Specifically, the terminal determines the time-frequency resources at which to start receiving the physical data channel based on the start symbol information. Through FIGS. 13 to 24, the method by which the terminal receives the data channel will be described. Specifically, the method by which the terminal determines the time-frequency resources for receiving the physical data channel will be described.

[0125] FIG. 13 is a diagram showing the time-frequency resource region in which the 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 signaled to the terminal based on the 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. Specifically, the base station determines based on the latest time resource (i.e., the last OFDM symbol of the RESET(s)) among the time-frequency resources corresponding to the 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. At this time, the base station determines the start symbol information of the physical data channel so as not to overlap with the RESET that makes the physical data channel set for the terminal unreceivable based on the time-frequency resource of the RESET set for the terminal via the RRC configuration. If the time-frequency resource corresponding to the frequency band in which the physical data channel is scheduled does not overlap with the RESET, the base station starts physical data channel transmission from the first OFDM symbol of the corresponding frequency band. Specifically, if there is a frequency band in which the RESET is not set in the slot, the base station starts physical data channel transmission from the first OFDM symbol of the corresponding frequency band. FIG. 12 shows seven OFDM symbols of the nth slot. In the embodiment of FIG. 12, the first RESET (RESET#1) and the second RESET (RESET#2) are set in the nth slot. In the frequency domain, the time-frequency resource in which the PDSCH reception of the terminal is scheduled overlaps with the first RESET (RESET#1), but does not overlap with the second RESET (RESET#2). Also, since the first RESET (RESET#1) ends at the second OFDM symbol of the nth slot, the base station starts PDSCH transmission from the third symbol of the nth slot. At this time, the base station sets the value of the field indicating the start symbol information of the DCI to 10 b to

[0127] If at least a part of the time - frequency resources scheduled for the physical data channel reception of the terminal overlaps with the RESET, the base station designates the OFDM symbol next to the last OFDM symbol of the corresponding RESET as the start symbol. The terminal does not expect to receive the physical data channel in the OFDM symbols corresponding to the RESET where the physical data channel set for the terminal cannot be received. Also, the terminal expects to receive the physical data channel from the OFDM symbol next to the last OFDM symbol of the RESET where the physical data channel set for the terminal cannot be received. Specifically, the terminal receives the physical data channel from the OFDM symbol next to the last OFDM symbol of the RESET where the physical data channel set for the terminal cannot be received.

[0128] In such an embodiment, despite being time - frequency resources not used for other purposes, there is a possibility that they cannot be used for the transmission of the physical data channel. To maximize the utilization of time - frequency resources, the terminal distinguishes between the frequency band that overlaps with the RESET where the physical data channel set for the terminal cannot be received and the band that does not overlap with the set RESET where the terminal cannot receive the physical data channel within the frequency band scheduled for the reception of the terminal's physical data channel, and determines the start point of receiving the physical data channel. Also, the base station designates start symbol information based on the last OFDM symbol among the OFDM symbols corresponding to the RESET(s) not set for the terminal. This will be described with reference to FIG. 14.

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

[0130] As described above, the terminal divides the frequency band in which the reception of the physical data channel of the terminal is scheduled into a frequency band that overlaps with the RESET in which the reception of the physical data channel set for the terminal is impossible, and a frequency band that does not overlap with the RESET set for the terminal, and determines the start timing of the reception of the physical data channel. Also, the base station designates start symbol information based on the last OFDM symbol among the OFDM symbols corresponding to the RESET(s) not set for the terminal. Specifically, the base station instructs the OFDM symbol next to the last OFDM symbol among the OFDM symbols corresponding to the RESET(s) not set for the terminal as the start symbol. In a specific embodiment, in the frequency band in which the reception of the physical data channel of the terminal is scheduled and that overlaps with the RESET in which the reception of the physical data channel set for the terminal is impossible, the terminal expects to receive the physical data channel from the OFDM symbol next to the last OFDM symbol of the RESET in which the reception of the physical data channel set for the terminal is impossible. Also, in the frequency band in which the reception of the physical data channel is scheduled and that does not overlap with the RESET in which the reception of the physical data channel set for the terminal is impossible, the terminal expects to receive the physical data channel from the OFDM symbol indicated by the start symbol information. The reason for instructing the start symbol of the physical data channel is that the terminal can determine the RESET in which the reception of the physical data channel set for the terminal is impossible, but cannot determine the RESET set for other terminals.

[0131] FIG. 14 shows seven OFDM symbols of the n-th slot. In the embodiment of FIG. 14, the first RESET (CORESET#1) and the second RESET (CORESET#2) are set in the n-th slot. At this time, the first RESET (CORESET#1) is a RESET that makes it impossible to receive the PDSCH set for the terminal, and the second RESET (RESET#2) is a RESET set for other terminals. The first RESET (RESET#1) for which the PDSCH reception of the terminal is scheduled overlaps, but the second RESET (RESET#2) does not overlap. At this time, 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 OFDM symbol next to the last symbol of the second RESET (RESET#2) not set for the terminal, as the start symbol. At this time, the value of the DCI field corresponding to the start symbol information is 01 b is. In the frequency band overlapping with the first RESET (RESET#1) among the frequency bands for which the PDSCH reception of the terminal is scheduled, the terminal starts receiving the PDSCH from the OFDM symbol next to the first OFDM symbol of the first RESET (RESET#1). Also, in the frequency band not overlapping with the first RESET (RESET#1) among the frequency bands for which the PDSCH reception of the terminal is scheduled, the terminal starts receiving the PDSCH from the second OFDM symbol, which is the OFDM symbol indicated by the start symbol information.

[0132] In another specific embodiment, if the reception of the physical data channel of the terminal overlaps with the time-frequency resources scheduled for reception of the physical data channel of the terminal and the RESET(s) not set for the terminal, the base station instructs the OFDM symbol next to the last OFDM symbol of the RESET(s) not set for the terminal as the start symbol. If there is no RESET not set for the terminal that overlaps with the time-frequency resources scheduled for reception of the physical data channel of the terminal, the base station designates the first OFDM symbol of the slot as the start symbol. In the embodiment of FIG. 14(b), since the PRB scheduled for reception of the PDSCH of the terminal overlaps with the PRB scheduled for reception of the PDSCH of the terminal and there is no RESET not set for the terminal, the base station designates the first OFDM symbol as the start symbol. At this time, the value of the DCI field corresponding to the start symbol is 00 b is. In the frequency band that overlaps with the first RESET (RESET#1) among the frequency bands in which the PDSCH reception of the terminal is scheduled, the terminal starts PDSCH monitoring from the OFDM symbol next to the last OFDM symbol of the first RESET (RESET#1). Also, in the frequency band that does not overlap with the first RESET (RESET#1) among the frequency bands in which the PDSCH reception of the terminal is scheduled, 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 the CORESET including RESET is used for the transmission of the physical data channel. Also, 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 where reception of the physical data channel set for the terminal is impossible. Therefore, the frequency resources not used for the transmission of the physical control channel among the time-frequency resources corresponding to RESET are used for the transmission of the physical data channel. At this time, 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 where reception of the physical data channel set for the terminal is impossible. The terminal performs rate matching using 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 FIGS. 15 to 16.

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

[0135] Regardless of whether or not it overlaps with a RESET where reception of the physical data channel set for the terminal is impossible, the terminal receives the physical data channel from the OFDM symbol indicated by the start symbol information in the frequency band where reception of the physical data channel of the terminal is scheduled. At this time, if the RESET set for the terminal includes a CORESET and the terminal receives the physical control channel with the corresponding CORESET, the terminal punctures the time-frequency resources used for the transmission of the physical control channel to receive the physical data channel. Also, if the RESET set for the terminal includes a CORESET and the terminal receives the physical control channel with the corresponding CORESET, the terminal performs rate matching using the remaining time-frequency resources excluding the time-frequency resources used for the transmission of the corresponding physical control channel to receive the physical data channel.

[0136] Figures 15 to 16 show seven OFDM symbols of the n-th slot. In the embodiments of FIGS. 15 to 16, a first RESET (RESET#1) and a second RESET (RESET#2) are set in the n-th slot. At this time, the first RESET (RESET#1) is a RESET that makes it impossible to receive the PDSCH set for the terminal, and the second RESET (RESET#1) is a RESET set for other terminals. The PRB for which the PDSCH reception of the terminal is scheduled overlaps with the first RESET (RESET#1), but does not overlap with the second RESET (RESET#2). At this time, 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. 15, the terminal receives the PDSCH from the second OFDM symbol indicated by the start symbol information in the frequency band where the PDSCH reception of the terminal is scheduled. At this time, the terminal punctures the PRB used for the transmission of the PDCCH with the RESET set for the terminal and receives the PDSCH.

[0137] In other specific embodiments, the terminal receives the physical data channel from the first OFDM symbol in the frequency band that overlaps with the RESET that makes it impossible to receive the physical data channel set for the terminal among the frequency bands where the reception of the physical data channel is scheduled. At this time, the terminal punctures the time-frequency resources used for the transmission of the physical control channel with the RESET set for the terminal and receives the physical data channel. Also, the terminal performs rate matching with the remaining time-frequency resources excluding the time-frequency resources used for the transmission of the physical control channel with the RESET set for the terminal and receives the physical data channel. In the frequency band where the reception of the physical data channel is scheduled and does not overlap with the RESET that makes it impossible to receive the physical data channel set for 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 the frequency band that overlaps with the RESET where reception of the PDSCH set for the terminal is not possible, among the frequency bands in which the reception of the PDSCH of the terminal is scheduled. At this time, the terminal receives the PDSCH by puncturing the PRB used for PDCCH transmission with the RESET where reception of the PDSCH set for the terminal is not possible. Also, the terminal performs rate matching with the remaining time-frequency resources excluding the PRB used for PDCCH transmission with the RESET where reception of the PDSCH set for the terminal is not possible, and receives the PDSCH. Further, in the frequency band that does not overlap with the RESET where reception of the PDSCH set for the terminal is not possible, among the frequency bands in which the PDSCH reception of the terminal is scheduled, 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. 13 to 14.

[0140] The base station divides one slot into multiple frequency bands and signals start symbols for each of the multiple frequency bands. The base station signals multiple start symbol information corresponding to the multiple start symbols via DCI. At this time, the terminal receives a physical data channel based on the multiple start symbol information. This is because multiple RESET(s) are set in one slot and the multiple RESET(s) are set in different PRBs and OFDM symbols from each other. 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 the RESET(s) where reception of the physical data channel overlapping with the time-frequency resources scheduled for reception of the terminal's physical data channel in the corresponding frequency band is impossible. Specifically, the base station sets the next OFDM symbol after the latest OFDM symbol among the last OFDM symbols of the RESET(s) where reception of the physical data channel overlapping with the time-frequency resources scheduled for reception of the terminal's physical data channel in the corresponding frequency band is impossible as the start symbol of the corresponding frequency band. At this time, if there are no RESET(s) where reception of the physical data channel overlapping with the time-frequency resources scheduled for reception of the terminal's physical data channel in the corresponding frequency band is impossible, 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 time-frequency resources in which the reception of the physical data channel set for the terminal is impossible due to RESET or the reception of the physical data channel of the terminal overlapping with the physical data channel transmitted to the terminal in the corresponding frequency band. In a specific embodiment, regardless of the start symbol of the corresponding frequency band, the terminal starts receiving the physical data channel from the OFDM symbol next to the last OFDM symbol of the RESET in which the reception of the physical data channel set for the terminal overlapping with the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled in the corresponding frequency band is impossible. In another specific embodiment, regardless of the start symbol of the corresponding frequency band, the terminal starts receiving the physical data channel from the OFDM symbol next to the last OFDM symbol of the physical control channel transmitted to the terminal overlapping with the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled in 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 via different slots. Such a scheduling method is referred to as cross-slot scheduling. For example, the base station transmits the physical control channel in the CORESET of the nth slot. At this time, the physical control channel schedules the physical data channel of the (n + k)th slot. Here, 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 set for the terminal may be different for each slot. Since it is determined whether the CORESET is used for the physical data channel by the physical control channel allocation of the base station, whether the reception of the physical data channel is impossible for the RESET including the corresponding CORESET may be different 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 the transmission of the physical data channel in the slot where the physical data channel scheduled by cross-slot scheduling is transmitted. Therefore, when cross-slot scheduling is used, the method of setting the start symbol corresponding to the physical data channel and the signaling method become problems. This will be described with reference to FIG. 17.

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

[0144] If the physical data channel is scheduled by cross-slot scheduling, the position of the start symbol is fixed to a specific OFDM symbol of the slot in which the physical data channel is transmitted. At this time, the specific OFDM symbol is set based on the last OFDM symbol of the RESET set in the terminal. Specifically, the specific OFDM symbol is the OFDM symbol next to the last OFDM symbol of the RESET set in the terminal. For example, if the last symbol of the 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 via an RRC signal or system information transmitted periodically. At this time, the terminal determines the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling based on the RRC signal or system information. Also, the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling is set for each of a plurality of frequency bands. Specifically, the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling is set for each PRB or for every specific number of consecutive PRBs. In other specific embodiments, the start symbol corresponding to the physical data channel scheduled by cross-slot scheduling is set commonly for all frequency bands of the cell. In yet other specific embodiments, the base station signals the start symbol via the DCI of the physical control channel that performs cross-slot scheduling.

[0145] The terminal performs rate matching on the time-frequency resources from which the time-frequency resources for scheduling the physical data channel by cross-slot scheduling are excluded, excluding the time-frequency resources where the time-frequency resources for scheduling the physical data channel overlap with the RESET, and receives the physical data channel. Also, the terminal performs puncturing on the time-frequency resources for scheduling the physical data channel by cross-slot scheduling, excluding the time-frequency resources where the time-frequency resources for scheduling the physical data channel overlap with the RESET, and receives the physical data channel. Additionally, for the operation of the terminal receiving the physical data channel, the previously described embodiments in FIG. 17 are applicable.

[0146] As described above, the DCI for scheduling the physical data channel uses the RESET field to indicate whether the RESET is used for receiving the physical data channel. At this time, the RESET field is used for other purposes than the above use. Specifically, if the physical data channel is scheduled by cross-slot scheduling, the RESET field indicates in which slot the physical data channel is scheduled. This is because 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 where 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 resources corresponding to the set RESET cannot be used for the physical data channel.

[0147] In the embodiment of FIG. 17, the PDCCH transmitted in the n-th slot schedules the PDSCH transmitted in the (n + 1)-th slot. When receiving the PDSCH scheduled by cross-slot scheduling in all frequency bands within the corresponding cell, the position of the starting symbol used is the third OFDM symbol, which is the symbol next to the last symbol of RESET#1 overlapping with the PDSCH in the frequency band. Therefore, the terminal starts receiving the PDSCH from the third slot of the (n + 1)-th slot. Also, the RESET field indicates that the PDSCH is scheduled in the (n + 1)-th slot. Therefore, the terminal starts receiving the PDSCH from the third slot of the (n + 1)-th slot.

[0148] The base station schedules the PDSCH transmitted in multiple slots using one physical control channel. Such a scheduling method is called slot-aggregation based scheduling. For example, the base station transmits the physical control channel in the RESET of the n-th slot. At this time, the physical control channel schedules the physical data channels of the n-th slot, the (n + 1)-th slot, …, the (n + k)-th slot. At this time, n is a natural number, and k is a natural number greater than 1. The position of the time-frequency resources occupied by the physical control channel mapped to the RESET set for the terminal may be different for each slot. Therefore, when slot-aggregation based scheduling is performed, it may be difficult for the base station or the terminal to determine the time-frequency resources available for transmission of the physical data channel in the slot where the physical data channel scheduled by slot-aggregation based scheduling is transmitted. Therefore, when slot-aggregation based scheduling is used, the method of setting the starting symbol and the signaling method corresponding to the physical control channel become a problem. This will be described with reference to FIGS. 18 to 19.

[0149] FIGS. 18 to 19 are diagrams showing reception of PDSCH by a terminal when slot - combined base scheduling is performed in a wireless communication system according to an embodiment of the present invention.

[0150] If the 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 corresponding plurality of slots. Specifically, if the physical data channel is scheduled by slot-aggregation based scheduling, the terminal starts receiving the physical data channel based on the position of the same OFDM symbol in all the slots in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted. Specifically, if the physical data channel is scheduled by slot-aggregation based scheduling, the position of the start symbol corresponding to all the slots in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted is set to the same specific OFDM symbol of the slot in which the corresponding physical data channel is transmitted. At this time, the specific OFDM symbol is set based on the last OFDM symbol at which RESET can be located in each slot. Specifically, the specific OFDM symbol is the OFDM symbol next to the last OFDM symbol of RESET set for the terminal. For example, if the last symbol of the set RESET 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 via an RRC signal or system information transmitted periodically. At this time, the terminal determines the start symbol corresponding to all the slots in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted based on the RRC signal or system information. Also, the start symbol corresponding to all the slots in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted is set for each of a plurality of frequency bands. Specifically, the start symbol corresponding to all the slots in which the physical data channel scheduled by slot-aggregation based scheduling is transmitted is set for each PRB or for every specific number of consecutive PRBs.In other specific embodiments, the start symbol corresponding to all slots transmitted on the physical data channel scheduled by slot-bound baseband scheduling is commonly set for all frequency bands of the cell. In other specific embodiments, the base station signals the start symbol via the DCI of the physical control channel that performs slot-bound baseband scheduling.

[0151] If the physical data channel is scheduled for a plurality of future slots, the terminal receives the physical data channel with the same reset in each of the plurality of future slots. Specifically, the RESET field is similarly applied to all slots in which the physical data channel scheduled by slot-bound baseband scheduling is transmitted. In other specific embodiments, the DCI of the physical control channel that performs slot-bound baseband scheduling indicates the start symbol corresponding to any one of all slots in which the physical data channel scheduled by slot-bound baseband scheduling is transmitted. The RESET field indicates whether RESET can be used for receiving the physical data channel in any one of the plurality of slots in which the physical data channel scheduled by slot-bound baseband scheduling is transmitted. At this time, any one of the slots is a slot in which the physical control channel including the DCI that schedules the physical data channel is transmitted. If slot-bound baseband scheduling is used, the terminal assumes that it cannot be used for receiving the physical data channel with the time-frequency resources corresponding to RESET in the slots other than those indicated by the RESET field among the slots in which the physical data channel scheduled by slot-bound baseband scheduling is transmitted.

[0152] In the embodiment of FIG. 18, the PDCCH transmitted in the n-th slot schedules the PDSCH transmitted in the n-th slot and the PDSCH transmitted in the (n + 1)-th slot. When receiving the PDSCH scheduled by slot-combined base scheduling in all frequency bands within the corresponding cell, the position of the starting symbol used is the third OFDM symbol. Therefore, the terminal starts receiving the PDSCH from the third slot from the n-th slot and the (n + 1)-th slot.

[0153] In the above-described embodiments, the position of the start symbol corresponding to all the slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted is the same. In other specific embodiments, the DCI of the physical control channel that performs slot-binding based scheduling indicates the start symbol corresponding to any one of all the slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted. Specifically, the DCI of the physical control channel that performs slot-binding based scheduling indicates the start symbol corresponding to the first slot among all the slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted. In other specific embodiments, the DCI of the physical control channel that performs slot-binding based scheduling indicates the start symbol of the slot in which the physical control channel that performs slot-binding based scheduling is transmitted. In such embodiments, the start symbols of the slots in which the physical data channels whose start symbol positions are not indicated by the DCI of the physical control channel that performs slot-binding based scheduling are transmitted are all fixed to the same specific OFDM symbol. For the sake of convenience of explanation, the start symbol corresponding to the physical data channel whose start symbol position is not indicated by the DCI of the physical control channel that performs slot-binding based scheduling is referred to as the remaining start symbol. The methods for setting and signaling the position of the remaining start symbol are the same as those described in the embodiment in which the positions of the start symbols corresponding to all the slots in which the physical data channel scheduled by slot-binding based scheduling is transmitted are the same. Specifically, the specific OFDM symbol is set based on the last OFDM symbol of the set RESET. Specifically, the specific OFDM symbol is the OFDM symbol next to the last OFDM symbol of the RESET set for the terminal. The base station signals the specific OFDM symbol via the RRC signal or the system information transmitted periodically. At this time, the terminal determines the position of the remaining start symbol based on the RRC signal or the system information. Also, the remaining start symbols are set for each of a plurality of frequency bands.Specifically, the remaining start symbols are set for each PRB or for every specific number of consecutive PRBs. In other specific embodiments, the remaining start symbols are set commonly for all frequency bands of the cell.

[0154] In the embodiment of FIG. 19, the PDCCH transmitted in the nth slot schedules the PDSCH transmitted in the nth slot and the PDSCH transmitted in the (n + 1)th slot. At this time, the PDCCH indicates that the start symbol of the nth slot is the first OFDM symbol. Also, the position of the start symbol used when receiving the remaining PDSCH 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 + 1)th slot.

[0155] In a slot after the slot in which a physical control channel performing slot - combined base scheduling is transmitted, the terminal performs rate matching on the time - frequency resources obtained by removing, from the time - frequency resources in which a physical data channel is scheduled by the slot - combined base scheduling, the time - frequency resources in which the time - frequency resources for scheduling the physical data channel overlap with the RESET, and receives the physical data channel. As described above, the value of the RESET field is also applied to slots after the slot in which the physical control channel performing slot - combined base scheduling is transmitted. At this time, the terminal performs rate matching on the time - frequency resources obtained by removing, from the time - frequency resources in which a physical data channel is scheduled by the slot - combined base scheduling, the time - frequency resources in which the time - frequency resources for scheduling the physical data channel overlap with the RESET that makes reception of the physical data channel impossible. Also, in a slot after the slot in which a physical control channel performing slot - combined base scheduling is transmitted, the terminal performs puncturing on the time - frequency resources in which the time - frequency resources for scheduling the physical data channel overlap with the RESET, among the time - frequency resources in which a physical data channel is scheduled by the slot - combined base scheduling, and receives the physical data channel. As described above, the value of the RESET field is also applied to slots after the slot in which the physical control channel performing slot - combined base scheduling is transmitted. At this time, the terminal performs puncturing on the time - frequency resources in which the time - frequency resources for scheduling the physical data channel overlap with the reset that makes reception of the physical data channel impossible, among the time - frequency resources in which a physical data channel is scheduled by the slot - combined base scheduling. Otherwise, the operation of the terminal for receiving the physical data channel is applied to the embodiments described before FIG. 17.

[0156] The base station divides an overlap - resource - set into a plurality of sub - resource - sets and indicates whether each sub - resource - set is unavailable for receiving a physical data channel. Also, the terminal determines whether each sub - resource - set is unavailable for receiving a physical data channel. Specifically, the terminal receives from the base station a DCI including an N - bit field that indicates N sub - resource - sets. At this time, 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 showing an example of a sub - resource - set 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. At this time, 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, a plurality of 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 setting one overlapping resource set into a plurality of sub - resource sets, the sub - resource sets are set based on the time domain without division in the frequency domain. At this time, the sub - resource sets are set based on the OFDM symbols occupied by the overlapping resource set. FIG. 20(a) shows an example of the sub - resource sets set based on the time domain.

[0160] Also, when setting one overlapping resource set into a plurality of sub - resource sets, the sub - resource sets are set based on the frequency domain without division in the time domain. At this time, the sub - resource sets are set based on the PRBs occupied by the overlapping resource set. At this time, the sub - resource sets include only continuous PRBs. In other specific embodiments, the sub - resource sets include discontinuous PRBs. In a specific embodiment, the overlapping resource set is set into M sub - resource sets. At this time, if the overlapping resource set occupies X PRBs, M - 1 sub - resource sets are set to occupy floor(X / M) PRBs, and one sub - resource set is set to occupy X-(M - 1)*floor(X / M) PRBs. At this time, floor(x) indicates the largest natural number that is the same as or smaller than x. FIGS. 20(b) and 20(d) show an example of the sub - resource sets set based on the frequency domain.

[0161] Also, when setting one overlapping resource set into a plurality of sub - resource sets, the sub - resource sets are set based on the time - frequency domain. At this time, the sub - resource sets are set based on the OFDM symbols and PRBs occupied by the overlapping resource set. At this time, the sub - resource sets include only continuous PRBs. In other specific embodiments, the sub - resource sets include discontinuous PRBs. FIGS. 20(c) and 20(e) show an example of the sub - resource sets set based on the time - frequency domain.

[0162] Including multiple RESETs of the overlap - resource - set, the multiple RESETs are preferentially set to the sub - resource - set. Specifically, bits of the overlap - resource - set bitmap are preferentially assigned to the multiple RESETs.

[0163] In other specific embodiments, regardless of the overlap - resource - set, the base station divides the time - frequency resources for which the reception of the terminal's physical data channel is scheduled, and signals whether the divided resources are available for the reception of the physical data channel. Specifically, the time - frequency resources for which the reception of the terminal's physical data channel is scheduled are evenly divided into 2 N parts based on the frequency domain. At this time, the base station uses the N - bit field of the L1 signaling or the N - bit field of the DCI to signal whether it is available for the reception of the terminal's physical data channel. The terminal determines the time - frequency resources available for the reception of 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 showing that a terminal receives a PDSCH based on an overlap - resource - set in a wireless communication system according to an embodiment of the present invention.

[0165] As described above, if the terminal is instructed that the PDSCH is transmitted in the sub - resource - set by the sub - resource - set bitmap included in the DCI that schedules the physical data channel, the terminal receives the physical data channel in the sub - resource - set. If the PDCCH is received in the time - frequency region corresponding to the sub - resource - set, the terminal punctures the time - frequency region occupied by the physical control channel to receive the physical data channel. Also, if the physical control channel is received in the time - frequency region corresponding to the sub - resource - set, the terminal performs rate matching in the remaining sub - resource - set excluding the time - frequency region occupied by the physical control channel to receive the physical data channel. In the embodiment of FIG. 21, the first RESET (RESET#1) and the second RESET (RESET#2) are set in the nth slot by the RRC signal. In the embodiment of FIG. 21, the time - frequency resources scheduled for the terminal's PDSCH reception by the DCI overlap with a part of the first RESET (RESET#1). Also, the DCI does not indicate that the first RESET (RESET#1) makes the reception of the PDSCH impossible. Therefore, the terminal determines the time - frequency resources where the time - frequency resources scheduled for the terminal's PDSCH reception by the DCI overlap with the first RESET (RESET#1) as the overlap - resource - set. At this time, the PDCCH is received via the time - frequency resources corresponding to the overlap - resource - set. The terminal punctures the time - frequency region occupied by the PDCCH to receive the PDSCH. Also, the terminal performs rate matching in the remaining overlap - resource - set excluding the time - frequency region occupied by the PDCCH to receive the PDSCH.

[0166] As described above, the base station uses the RRC signal to set the RESET. When the base station sets the RESET using the RRC signal, the method for the base station to indicate the time - frequency resources corresponding to at least one RESET becomes a problem. This will be described with reference to FIGS. 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 resources corresponding to RESET. If RESET occupies continuous time-frequency resources, the base station uses one indication value to indicate the continuous time-frequency resources. At this time, the indication value is called RIV (resource indication value), and such an indication method is called the RIV method. Specifically, the base station generates one RIV by combining the start position of the continuous resources and the number of continuous resources. Specifically, if RESET occupies continuous OFDM symbols, the base station generates the RIV using the start index of the OFDM symbol and the index of the last OFDM symbol. Also, if RESET occupies continuous RPBs and continuous OFDM symbols, the base station generates one RIV based on the index of the PRB and generates one RIV based on the index of the OFDM symbol. At this time, the base station transmits two RIV values. In other specific embodiments, two RIVs are encoded to generate one value. At this time, the base station transmits only the generated one value to signal the time-frequency resources occupied by RESET. The method for generating RIV will be described in detail with reference to FIGS. 27 to 30.

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

[0169] The base station needs to signal the connection relationship between RESET and the bit field of L1 - signaling that indicates RESET. At this time, the bit field is the RESET field described above. The base station indicates the bit field index of the L1 - signaling corresponding to RESET and signals the connection relationship between RESET and the bit field of the L1 - signaling that indicates RESET. L1 - signaling is the DCI that schedules the physical data channel. Also, L1 - signaling is the group - common DCI transmitted in the slot where the physical data channel is transmitted. In a specific embodiment, the base station signals the connection relationship between RESET and the bit field of the L1 - signaling that indicates RESET regardless of the physical data channel allocation information. For example, the RESET field is n bits. To signal that the base station indicates whether the i - th bit of the RESET field makes RESET unavailable for receiving physical data, the base station signals i via the 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 is unavailable for receiving the physical data channel. Also, if the value of the i - th bit of the RESET field is 0, the terminal determines that it will receive the physical data channel in the time - frequency resource corresponding to the corresponding RESET. The bits of the RESET field corresponding to the RESET that do not overlap with the time - frequency resource where the physical data channel is scheduled are used for other purposes. At this time, the time - frequency resource where the physical data channel is scheduled is indicated by the RA (Resource Allocation) field. Specifically, it indicates whether the time - frequency resources corresponding to other RESETs are unavailable for receiving the physical data channel. For example, the first bit of the RESET field indicates the receivability of the physical data channel for the first RESET (RESET#1) and the second RESET (RESET#2), and the second bit indicates the receivability of the physical data channel for the third RESET (RESET#3) and the fourth RESET (RESET#4).At this time, the first RESET (RESET#1) and the second RESET (RESET#2) overlap with the time-frequency resources in 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 resources in which the physical data channel is scheduled. At this time, the first bit of the RESET field does not indicate the receivability of the physical data channel for the first RESET (RESET#1) and the second RESET (RESET#2), and the first RESET (RESET#1) indicates the receivability of the physical data channel. Also, the second bit of the RESET field does not indicate the receivability of the physical data channel for the third RESET (RESET#3) and the fourth RESET (RESET#4), and the second RESET (RESET#2) indicates the receivability of the physical data channel. If all the RESETs indicated by any one bit of the RESET field do not overlap with the time-frequency resources in which the physical data channel is scheduled, the corresponding bit indicates whether the specific CORESET or the RESET including the CORESET is used for receiving the physical data channel.

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

[0171] The time-frequency resources corresponding to different RESETs overlap. At this time, the method by which the terminal receives the physical data channel using the time-frequency resources corresponding to the RESET becomes a problem. This will be described with reference to FIGS. 22 to 24.

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

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

[0174] In the embodiment of FIG. 22, the time-frequency resources indicated to be occupied by the first RESET (RESET#1) and the time-frequency resources indicated 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). Therefore, the time-frequency resources where the time-frequency resources indicated to be occupied by the first RESET (RESET#1) and the time-frequency resources indicated to be occupied by the second RESET (RESET#2) overlap are included in the second RESET (RESET#2) and not 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 indicated to be occupied by the first RESET (RESET#1) and the time-frequency resources indicated to be occupied by the second RESET (RESET#2) overlap are included in the first RESET (RESET#1) and not in the second RESET (RESET#2).

[0175] In another specific embodiment, when the base station sets RESET for the terminal, the terminal assumes that the RESETs overlap with each other. At this time, if the bits of the RESET fields corresponding to different RESETs indicate different information, there will be a problem. For example, the bit of the bit field of the L1 - signaling corresponding to the first RESET indicates whether it is impossible to be used for receiving the physical data channel in the first RESET, and the bit of the bit field of the L1 - signaling corresponding to the second RESET indicates that it is possible to be used for receiving the physical data channel in the second RESET. At this time, the terminal prioritizes one of the pieces of information. Specifically, it prioritizes the information indicating that it is possible to be used for receiving the physical data channel. In the embodiments of FIGS. 23 to 24, as shown in FIG. 23(a), the time - frequency resources indicated to be occupied by the first RESET (RESET#1) and the time - frequency resources indicated to be occupied by the second RESET (RESET#2) overlap. In the embodiment of FIG. 23(b), the RESET field indicates that the first RESET (RESET#1) is not available for receiving the PDSCH, and the second RESET (RESET#2) is available for receiving the PDSCH. Therefore, the terminal receives the PDSCH with the second RESET (RESET#2) including the time - frequency resources 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 available for receiving the PDSCH, and the second RESET (RESET#2) is not available for receiving the PDSCH. Therefore, the terminal receives the PDSCH with the first RESET (RESET#1) including the time - frequency resources where the first RESET (RESET#1) and the second RESET (RESET#2) overlap.

[0176] Specifically, information indicating that the physical data channel cannot be used for reception is prioritized. In the embodiment of FIG. 24(a), the RESET field indicates that the first RESET (RESET#1) cannot be used for PDSCH reception and the second RESET (RESET#2) can be used for PDSCH reception. Therefore, the terminal receives PDSCH with the second RESET (RESET#2) except for the time-frequency resources 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) can be used for PDSCH reception and the second RESET (RESET#2) cannot be used for PDSCH reception. Therefore, the terminal receives PDSCH with the first RESET (RESET#1) except for the time-frequency resources where the first RESET (RESET#1) and the second RESET (RESET#2) overlap.

[0177] Also, if different RESETs overlap and the L1-signaling bit fields corresponding to the different RESETs indicate different information, the terminal determines whether to prioritize information indicating that reception of the physical data channel is impossible based on the RRC signal or information indicating that reception of the physical data channel is possible. Also, the terminal independently determines which information to prioritize for each RESET. The terminal prioritizes information indicating that reception of the physical data channel is impossible for the time-frequency resources corresponding to the first RESET and prioritizes information indicating that reception of the physical data channel is possible for the time-frequency resources 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 contains 7 OFDM symbols. In other specific embodiments, one slot contains 14 OFDM symbols. A slot contains DL symbols used for DL transmission. Also, a slot contains UL symbols used for UL transmission. Also, a slot contains gap (GAP) symbols that are not used for DL transmission or UL transmission when the slot is changed from DL transmission to UL transmission or from UL transmission to DL transmission. This is because time is required for the base station and the terminal to change from the transmission mode to the reception mode or from the reception mode to the transmission mode. The gap symbol is one OFDM symbol. Also, the gap symbol contains one OFDM symbol that transmits DL control information.

[0180] FIG. 25 shows an 8-slot configuration. In Format 0, a slot contains only DL symbols (DL). In Format 1, a slot contains six DL symbols (DL) and one gap symbol (GP). In Format 2, a slot contains five DL symbols (DL), one gap symbol (GP), and one UL symbol (UL). In Format 3, a slot contains four DL symbols (DL), one gap symbol (GP), and two UL symbols (UL). In Format 4, a slot contains three DL symbols (DL), one gap symbol (GP), and three UL symbols (UL). In Format 5, a slot contains two DL symbols (DL), one gap symbol (GP), and four UL symbols (UL). In Format 6, a slot contains one DL symbol (DL), one gap symbol (GP), and five UL symbols (UL). In Format 7, a slot contains six UL symbols (UL) and one gap symbol (GP). In Format 8, a slot contains only UL symbols (UL). For the sake of convenience in explanation, a slot containing only DL symbols like Format 0 is referred to as a DL-only slot, a slot containing only UL symbols like Format 7 is referred to as a UL-only slot, and a slot containing both DL symbols and UL symbols like Formats 1 to 6 is referred to as a hybrid slot. In a slot that is not a UL-only slot, a CORESET for PDCCH transmission is configured. At this time, group-common PDCCH and UE-specific PDCCH are transmitted in the CORESET. One or more terminals receive the group-common PDCCH. Also, the group-common PDCCH contains slot configuration information indicating the slot configuration. At this time, the group-common PDCCH contains the slot configuration information of the slot in which the PDCCH is transmitted. Also, the group-common PDCCH contains not only the slot configuration information of the slot in which the PDCCH is transmitted but also the slot configuration information of the next slot after the 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 of N future slots. At this time, 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 of 1 or more. N is dynamically changed. Also, N is set by an RRC signal. Also, within the set set by the RRC signal, the base station dynamically instructs (indicates) the terminal to the terminal.

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

[0182] FIG. 26 is a diagram showing that terminal-specific PDCCH indicates resources scheduled for 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 resources in which the reception of the PDSCH of the first terminal UE1 is scheduled. Also, the terminal-specific PDCCH for the second terminal UE2 indicates the time-frequency resources in which the reception of the PUSCH of the second terminal UE2 is scheduled. At this time, the base station indicates continuous time-frequency resources using one indication value. Specifically, in the LTE system, the base station indicates continuous time-frequency resources using one indication value. At this time, the indication value is called an RIV, and such an indication method is called an RIV method. Specifically, the RIV indicates the start position of the continuous resources and the number of the continuous resources. The terminal determines the start position of the continuous resources allocated to the terminal and the number of the corresponding resources based on the RIV.

[0184] In the type-2 resource allocation of the LTE system, the RIV is used as follows. If the DCI format of the PDCCH is any one of 1A, 1B, and 1D, or the DCI format of the EPDCCH is any one of 1A, 1B, and 1D, or the DCI format of the MPDCCH is 6-1A, the DCI includes the RIV. The base station uses the RIV to indicate the continuous resources in the frequency domain where the reception of the physical data channel of the terminal is scheduled. At this time, the terminal obtains the RB start which is the starting RB of the continuous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI and the number L of RBs of the continuous resources. Therefore, the base station determines the value of the RIV by the following formula. start and the number L of RBs of the continuous resources. CRBs To obtain. Therefore, the base station determines the value of the RIV by the following formula.

[0185]

Equation

[0186] At this time, N DL RB is the total number of RBs used for resource allocation for DL transmission. If the type-2 resource allocation method is used for UL transmission, N DL RB is the total number of RBs used for resource allocation for UL transmission and is replaced by N UL RB .

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

Equation

[0188] [Number]

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

[0190] [Number]

[0191] At this time, the base station determines the value of the RIV according to the following mathematical formula.

[0192] [Number]

[0193] At this time, N DL RB is the total number of RBs used for resource allocation for DL transmission. If the type-2 resource allocation method is used for UL transmission, N DL RB is the total number of RBs used for resource allocation for UL transmission and is replaced by N UL RB .

[0194] The base station uses the RIV to indicate continuous resources in the time domain for which the reception of the physical data channel of the terminal is scheduled. At this time, the terminal obtains S start which is the starting OFDM symbol of the continuous resources in the frequency domain scheduled by the DCI based on the RIV included in the DCI, and L symbols which is the number of OFDM symbols of the continuous resources. S start is interpreted as the position within the slot. For example, if S start = 0, then S start indicates the first OFDM symbol of the slot. N symbolIf it is the total number of symbols for which reception of the physical data channel of the terminal scheduled by the DCI is allocated, the value of the RIV is determined by the following formula.

[0195]

Number

[0196] The base station indicates the resources scheduled for the terminal in units of a plurality of OFDM symbols.

Number

[0197]

Number

[0198] Also, the number of continuous OFDM symbols of the continuous resources indicated by the RIV that can be set by the base station is as follows.

[0199]

Number

[0200] The base station sets the value of the RIV by the following formula.

[0201]

Number

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

[0203] As described above, the base station uses the RIV to indicate the time-frequency resource for which the reception of the terminal's PDSCH is scheduled, or the time-frequency resource for which the terminal's PUSCH transmission is scheduled. At this time, the terminal receives the PDSCH or transmits the PUSCH in the time-frequency resource indicated by the RIV. The base station uses the value of the RIV in the frequency domain and the value of the RIV in the time domain to indicate the resource scheduled for the terminal. Specifically, the base station independently indicates the value of the RIV in the frequency domain and the value of the RIV in the time domain to indicate the time-frequency resource scheduled for the terminal. For convenience of explanation, the RIV in the frequency domain is denoted as RIV freq and the RIV in the time domain is denoted as RIV time . In a specific embodiment, the base station transmits DCI including two RIVs, RIV freq and RIV time , for scheduling the reception of the PDSCH, and indicates the time-frequency resource to which the PDSCH is allocated.

[0204] In the embodiment of FIG. 27, the base station transmits RIV freq and RIV time respectively via DCI. At this time, the terminal determines the time-frequency region indicated by RIV freq and RIV time according to the above-described embodiment. Specifically, the terminal obtains L freq and RB CRB from RIV start . In addition, the terminal obtains L time and S symbols from RIV start .

[0205] If the maximum value indicated by the RIV is Q, the bit length for expressing the RIV is

Number

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

[0207] The base station transmits one RIV to indicate the time - frequency resource scheduled for the terminal. At this time, one RIV is a value generated by encoding two RIVs (RIV1, RIV2). The two RIVs are the RIV freq and RIV time described above. Let the maximum value of RIV1 be RIV1 max . Also, the RIV obtained by encoding and refining the two RIVs is called the final RIV (RIV total ). The base station determines the value of the final RIV (RIV total ) according to the following formula.

[0208]

Equation

[0209] Also, the terminal is the final RIV (RIV totalRIV1 and RIV2 are obtained from the following equations.

[0210]

Equation

[0211] At this time, RIV1 is RIV freq and RIV2 is RIV time If the base station schedules time-frequency resources for the terminal in one RB unit, the maximum value of RIV freq which is RIV freq max is determined by the following equation.

[0212]

Equation

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

Equation

[0214]

Equation

[0215] At this time,

Equation

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

[0217]

Equation

[0218] If the base station schedules time - frequency resources for the terminal in multiple OFDM symbol units and the number of multiple RBs is

Equation

[0219]

Equation

Equation

[0220] In the embodiment of FIG. 28, the base station transmits one final RIV (RIV total ) to the terminal via the DCI of the terminal - specific PDCCH. The terminal determines RIV from the final RIV (RIV total ) according to the above - described embodimenttime and RIV freq to obtain. The terminal is IV freq from L CRB and RB start to obtain. Also, the terminal is RIV time from L symbols and S start to obtain.

[0221] In other specific embodiments, the base station encodes three or more RIVs to generate one final RIV (RIV total ) and uses DCI to transmit the final RIV (RIV total ). At this time, the base station encodes two RIVs sequentially to generate the final RIV (RIV total ). For example, the base station may encode three RIVs (RIV1, RIV2, RIV3) to generate the final RIV (RIV total ). At this time, the base station first encodes two RIVs (RIV1, RIV2) to generate an intermediate RIV. Next, the base station encodes the intermediate RIV and the remaining one RIV (RIV3) to generate the final RIV (RIV total ).

[0222] Through such an embodiment, the base station reduces the number of bits used for RIV transmission. For example, assume that the number of RBs that the terminal can schedule is 6 and the number of OFDM symbols that the terminal can schedule is 9. At this time, RIV freq has any value from 0 to 20. Also, RIV time has any value from 0 to 44. As in the above-described embodiment, if RIV freq and RIV time are encoded to generate the final RIV (RIV total ), the final RIV (RIV total ) has any value from 0 to 944. Therefore, 10 bits are required to transmit the final RIV (RIV total ). Specifically, according to such an embodiment, the base station is RIV freq and RIV timeWhen transmitting each of them, the number of bits of the DCI used for RIV transmission can be reduced by only 1 bit. Table 4 shows the RIV freq and the RIV time When transmitting each of them, the number of bits of the DCI required for the RIV according to the number of RBs that the terminal can schedule and the number of OFDM symbols is shown. Also, Table 5 shows the RIV freq and the RIV time When encoding them to transmit the final RIV (RIV total ), the number of bits of the DCI required for RIV transmission according to the number of RBs that the terminal can schedule and the number of OFDM symbols is shown. Through Tables 4 and 5, it can be seen that when encoding a plurality of RIVs to transmit the final RIV (RIV total ), the number of bits of the DCI required for RIV transmission can be reduced.

[0223]

Table 4

[0224]

Table 5

[0225] In the above-described embodiments, the generation of the final RIV (RIV total ) and the final RIV (RIV totalThe description has been made only for the case where the transmission of [[ID=]] is scheduled in the time-frequency resources indicated by DCI. However, the above-described embodiments are not limited thereto, and are also applicable to the case where the time-frequency resources are indicated using RIV. For example, the above-described embodiments may be applied when the base station schedules the time-frequency resources via the RRC signal. Further, the above-described embodiments are applied when the base station indicates the preempted time-frequency resources to the terminal. At this time, the preempted time-frequency resources indicate that some of the time-frequency resources already scheduled for the terminal are not scheduled for the terminal.

[0226] The base station instructs the terminal on the time resources to be scheduled according to the following embodiments. Specifically, the base station uses the RRC signal to set up a time resource mapping table that shows the mapping between the physically scheduled data channel and the time resources for the terminal. At this time, the RRC signal is a terminal-specific RRC signal. Also, the base station signals the state of the mapping table using any one field that contains the DCI for scheduling the reception or transmission of the terminal's physical data channel. The terminal determines the mapping table of the time resources set by the base station based on the RRC signal, and determines the time resource area in which the corresponding data channel is scheduled based on any one field that contains the DCI for scheduling the reception or transmission of the terminal's physical data channel. The number of states of the time resource mapping table is 16. At this time, any one field that contains the DCI is 4 bits. The time resource mapping table includes the K1 value indicating the HARQ-ACK transmission slot, the slot in which the physical data channel is transmitted, 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, and the mapping type of the physical data channel. At this time, the mapping type of the physical data channel indicates whether the position of the DMRS (demodulation reference signal) 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 the slot in which the physical data channel is transmitted and 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. For example, 2 out of 6 bits indicate the slot in which the physical data channel is transmitted. The 2 bits indicating the slot in which the physical data channel is transmitted are referred to as K0. K0 indicates the difference in index between the slot in which the terminal receives the DCI and the slot in which the physically scheduled data channel for the terminal is transmitted. The values that K0 can have are 00 b , 01b , 10 b , and 11 b It is any one of them. If the value of K0 is 0, the slot in which the terminal receives DCI and the slot in which the physical data channel scheduled for the terminal is transmitted are the same. Also, 4 out of 6 bits indicate the first OFDM symbol 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. At this time, the number of OFDM symbols in which the physical data channel is scheduled is any one of 2, 4, 7, and 14. Specifically, 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 setting the OFDM symbol index of one slot from 0 to 15, each state indicates the following OFDM symbols. The OFDM symbols indicated by the value of the state 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}. At this time, in X: {Y}, X indicates the value of the state, and Y indicates the OFDM symbol indicated by the X state.

[0229] In other specific embodiments, one out of the 6 bits indicates the slot in which the physical data channel is transmitted. The 1 bit indicating the slot in which the physical data channel is transmitted is referred to as K0. K0 indicates the index difference between the slot in which the terminal receives DCI and the slot in which the physically scheduled data channel is transmitted. The value that K0 has is either one of 0 and 1. If the value of K0 is 0, the slot in which the terminal receives DCI and the slot in which the physically scheduled data channel is transmitted are the same. If the value of K0 is 1, the index difference between the index of the slot in which the terminal receives DCI and the index of the slot in which the physically scheduled data channel is transmitted is E. At this time, E is fixed to a natural number different from 1. Also, 5 out of the 6 bits indicate the first OFDM symbol 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. At this time, the number of OFDM symbols in which the physical data channel is scheduled is any one of 1, 2, 4, 7, and 14. Specifically, the 5 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 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}. At this time, in X: {Y}, X indicates the value of the state, and Y indicates the OFDM symbol indicated by the X state. Also, the state values 30 and 31 are reserved. The state values 30 and 31 respectively indicate all DL symbols set semi-statically and all unknown symbols set semi-statically. At this time, the unknown symbol indicates a symbol that is not set as a UL symbol or a DL symbol. Also, the state values 30 and 31 respectively indicate all OFDM symbols except for the specified number of OFDM symbols specified from the end of the slot among all DL symbols set semi-statically and all unknown symbols set semi-statically. At this time, the specified number is a fixed number. For example, the specified number may be 1. Also, the specified number is specified separately for each terminal. Specifically, the specified number is set for each terminal by the RRC signal.

[0232] In another specific embodiment, 1 bit out of 6 bits indicates the reference position of the slot in which the physical data channel is transmitted. At this time, 1 bit indicates whether the reference position of the slot in which the physical data channel is transmitted is the first OFDM symbol of the slot or the OFDM symbol immediately following the CORESET. 5 bits out of 6 bits are the number of OFDM symbols in which the physical data channel is scheduled. If 1 bit out of 6 bits indicates the start point of the slot and the index of the OFDM start symbol indicated by 5 bits out of 6 bits is A, the physical data channel is transmitted in the OFDM symbol corresponding to the number of OFDM symbols from A to the number of OFDM symbols in which the physical data channel is transmitted. If 1 bit out of 6 bits indicates the OFDM symbol immediately following the CORESET and the index of the OFDM start symbol indicated by 5 bits out of 6 bits is A, the physical data channel is transmitted in the OFDM symbol corresponding to the number of OFDM symbols from A + B to the number of OFDM symbols in which the physical data channel is transmitted. At this time, B is the index of the OFDM symbol corresponding to the OFDM symbol immediately following the CORESET.

[0233] FIGS. 29 to 33 are diagrams showing OFDM symbols corresponding to the physical data channel scheduled for the terminal indicated by 6 bits of the 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 physical data channel scheduled for the terminal indicate 14 states where the number of OFDM symbols for which the physical data channel is scheduled is 1, 2 states where the number of OFDM symbols for which the physical data channel is scheduled is 7, and 28 states where the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. At this time, the states where the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2 follow the RIV method of indicating by bundling 14 OFDM symbols in pairs. 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 physical data channel scheduled for the terminal indicate 14 states where the number of OFDM symbols for which the physical data channel is scheduled is 1, 8 states where the number of OFDM symbols for which the physical data channel is scheduled is 7, and 28 states where the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2. At this time, the states where the number of OFDM symbols for which the physical data channel is scheduled is a multiple of 2 indicate that they start 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 physically scheduled data channel at the terminal indicate 14 states where the number of OFDM symbols in which the physical data channel is scheduled is 1, and 49 states where the number of OFDM symbols in which the physical data channel is scheduled is a multiple of 2. At this time, out of the 49 states where the number of OFDM symbols in which the physical data channel is scheduled is a multiple of 2, 28 states indicate starting from an even OFDM symbol index and 21 states indicate starting 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 physically scheduled data channel at the terminal indicate 14 states where the number of OFDM symbols in which the physical data channel is scheduled is 1, and 48 states where the number of OFDM symbols in which the physical data channel is scheduled is a multiple of 2. At this time, out of the 48 states where the number of OFDM symbols in which the physical data channel is scheduled is a multiple of 2, 28 states indicate starting from an even OFDM symbol index and 20 states indicate starting from an 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 physically scheduled data channel are as follows: for 14 states where the number of OFDM symbols for which the physical data channel is scheduled is 1; for 8 states where the number of OFDM symbols for which the physical data channel is scheduled is 7; for 13 states where the number of OFDM symbols for which the physical data channel is scheduled is 2; for 11 states where the number of OFDM symbols for which the physical data channel is scheduled is 4; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 14; for 4 states where the number of OFDM symbols for which the physical data channel is scheduled is 3; for 2 states where the number of OFDM symbols for which the physical data channel is scheduled is 5; for 2 states where the number of OFDM symbols for which the physical data channel is scheduled is 6; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 8; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 9; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 10; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 11; for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 12; and for 1 state where the number of OFDM symbols for which the physical data channel is scheduled is 13. At this time, the states where the number of OFDM symbols for which the physical data channel is scheduled is 2 all start from OFDM symbol indexes that are multiples of 3. According to a specific embodiment, the OFDM symbols indicated by the 6 bits are as shown in FIG. 33.

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

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

[0241] In still other specific embodiments, the 6 bits of the RRC signal used by the base station to indicate the physically scheduled data channel at the terminal indicate 14 states where the number of OFDM symbols for which the physical data channel is scheduled is 1, 8 states where the number of OFDM symbols for which the physical data channel is scheduled is 7, 13 states where the number of OFDM symbols for which the physical data channel is scheduled is 2, 11 states where the number of OFDM symbols for which the physical data channel is scheduled is 4, one state where the number of OFDM symbols for which the physical data channel is scheduled is 14, 9 states where the number of OFDM symbols for which the physical data channel is scheduled is 6, 6 states where the number of OFDM symbols for which the physical data channel is scheduled is 9, and 2 states where the number of OFDM symbols for which the physical data channel is scheduled is 11. At this time, the state where the number of OFDM symbols for which the physical data channel is scheduled is 1 indicates starting from all possible OFDM symbol indexes.

[0242] The method of indicating the time - frequency resources scheduled for the terminal using the RIV was described above. The base station uses the RIV to indicate the resources that are continuous in the time domain and scheduled for the terminal. At this time, the base station indicates the position of the start symbol of the continuous resources scheduled for the terminal using the index of the reference OFDM symbol. The index of the start OFDM symbol indicated by the RIV is the value obtained by subtracting the index of the reference OFDM symbol from the index of the start OFDM symbol of the time - frequency resources scheduled for the terminal. Specifically, the base station signals the index of the reference OFDM symbol using the RRC signal. Also, the base station determines the value of the RIV according to the following formula.

[0243]

Equation

[0244] L symbols indicates the number of OFDM symbols of the time resources scheduled for the terminal. Also, S start is the index of the start OFDM symbol of the time resources scheduled for the terminal obtained based on the index of the reference OFDM symbol. Therefore, the OFDM symbol index of the time resources scheduled for the terminal is obtained by the following formula.

[0245] S start = S start ’ + R

[0246] At this time, 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 should prepare to receive the data channel can be reduced. Also, such an embodiment can reduce the number of bits of the field used to transmit the RIV.

[0247] It was assumed above that the base station uses the RRC signal to set the index of the reference OFDM symbol. In other specific embodiments, the terminal assumes that the index of the reference OFDM symbol is the first OFDM symbol of the slot. In yet other specific embodiments, the terminal determines the index of the reference OFDM symbol based on the CORESET in which the DCI for scheduling the reception of the terminal's physical data channel is transmitted. For example, the terminal determines that the index of the first OFDM symbol of the CORESET in which the DCI for scheduling the reception of the terminal's physical data channel is transmitted is the index of the reference OFDM symbol. In still other specific embodiments, the terminal determines that the index of the OFDM symbol immediately following the last OFDM symbol of the CORESET in which the DCI for scheduling time resources for the terminal is transmitted is 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 terminal's physical data channel is transmitted to the terminal is K and the number of OFDM symbols corresponding to the time resources occupied by the CORESET is A, the index of the reference OFDM symbol is K + A. The number of bits required for the transmission of the RRC signal can be reduced compared to when the index of the reference OFDM symbol is signaled via the RRC signal.

[0248] In still other specific embodiments, 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 and the above-described K0 value. K0 indicates the 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. 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 the same as 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 other specific embodiments, if K0 is the same as 0, the terminal determines the index of the reference OFDM symbol to be the value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET to 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. In such an embodiment, the terminal can perform different operations when cross-scheduling is performed and when it is not performed, thereby reducing the number of bits required for RIV transmission. Also, the number of bits required for RRC signal transmission can be reduced compared to when the index of the reference OFDM symbol is signaled via the RRC signal.

[0249] 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 received by the terminal. At this time, 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. Also, the physical channel received by the terminal is the PDSCH. Specifically, 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 the index 2 or 3 of the OFDM symbol within the slot. At this time, the position of the DMRS is indicated by the PBCH. Also, 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 as 0. Also, if the mapping type of the physical data channel is type B, the terminal determines the index of the reference OFDM symbol as the index of the first OFDM symbol of the CORESET in which the DCI that schedules the reception of the terminal's physical data channel is transmitted. In a more specific embodiment, if the mapping type of the physical data channel is type B, the terminal determines the index of the reference OFDM symbol as a value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the corresponding CORESET to the index of the first OFDM symbol of the CORESET in which the DCI that schedules the reception of the terminal's physical data channel is transmitted.

[0250] In yet another specific embodiment, the terminal determines the index of the reference OFDM symbol based on the position of the DCI that schedules the reception of the physical data channel of the terminal. Specifically, if the DCI that schedules the reception of the physical data channel of the terminal is located before the pre-specified OFDM symbol, the terminal determines that the index of the reference OFDM symbol is 0. Also, if the DCI that schedules the reception of the physical data channel of the terminal is located before the pre-specified OFDM symbol, the terminal determines that the index of the reference OFDM symbol is the index of the first OFDM symbol of the CORESET on which the DCI that schedules the reception of the physical data channel of the terminal is transmitted. In yet another specific embodiment, if the DCI that schedules the reception of the physical data channel of the terminal is located before the pre-specified OFDM symbol, the terminal determines that the index of the reference OFDM symbol is the value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET to the index of the first OFDM symbol of the CORESET on which the DCI that schedules the reception of the physical data channel of the terminal is transmitted. The position of the pre-specified OFDM symbol is the same as the position of the DMRS when the mapping type of the physical data channel received by the terminal set by the PBCH is type A. Specifically, if the mapping type of the physical data channel is type A and the PBCH indicates the second OFDM symbol as the position of the DMRS, the position of the pre-specified OFDM symbol 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 position of the DMRS, the position of the pre-specified OFDM symbol 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-described K0 value, and whether it is located before the OFDM symbol in which the DCI for scheduling the reception of the physical data channel of the terminal is pre-specified. K0 indicates the 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-specified OFDM symbol, the terminal determines the index of the reference OFDM symbol as 0. Also, if K0 is the same as 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 as 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 the same as 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 as the value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET to 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. In such an embodiment, the terminal can perform different operations when cross-scheduling is performed and when it is not performed, thereby reducing the number of bits required for RIV transmission. Also, the number of bits required for RRC signal transmission can be reduced compared to when the index of the reference OFDM symbol is signaled via the RRC signal.

[0252] In still other specific embodiments, the terminal determines the index of the reference OFDM symbol based on the CORESET monitored by the terminal. Specifically, if multiple CORESETs monitored by the terminal are configured 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 such an embodiment, the terminal can receive the physical data channel regardless of through which CORESET among the multiple CORESETs the physical control channel is transmitted.

[0253] In still other specific embodiments, if the CORESET through which the scheduling DCI for receiving the physical data channel of the terminal is transmitted is located in a slot different from the slot in which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol as 0. Also, if the CORESET through 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 in which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol as the first OFDM symbol of the CORESET through which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted. In still other specific embodiments, if the CORESET through 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 in which the corresponding physical data channel is transmitted, the terminal determines the index of the reference OFDM symbol as the value obtained by adding the number of OFDM symbols corresponding to the time resources occupied by the CORESET to the index of the first OFDM symbol of the CORESET through which the DCI for scheduling the reception of the physical data channel of the terminal is transmitted.

[0254] Also, when the DCI schedules the reception 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 in which the reception of the physical data channel of the terminal is scheduled are located in different slots. Specifically, the terminal determines the last OFDM symbol of the time-frequency resource in which the reception of the physical data channel of the terminal is scheduled as the last OFDM symbol or the symbol before the last OFDM symbol of the slot in which the start OFDM symbol of the time-frequency resource in which the reception of the physical data channel of the terminal is scheduled is located. For example, if the number of OFDM symbols included in a slot is 14 and the DCI indicates that the last OFDM symbol of the time-frequency resource in which the reception of the physical data channel of the terminal is scheduled is the 7th OFDM symbol. At this time, if the number of OFDM symbols occupied by the time-frequency resource in which the reception of the physical data channel of the terminal is scheduled as indicated by the DCI is 7, the terminal determines that the OFDM symbols in which the reception of the physical data channel of the terminal is scheduled are from the 7th OFDM symbol to the 14th OFDM symbol. In the above-described embodiment, the physical data channel received by the terminal is the PDSCH.

[0255] The above-described embodiment in which the base station uses the index of the reference OFDM symbol of the start symbol position of the continuous resources scheduled for the terminal to indicate is also applicable when the base station schedules the physical channel transmission of the terminal. Specifically, the terminal determines the index of the reference OFDM symbol as the first OFDM symbol of the slot. The OFDM symbol referred to regarding 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. At this time, 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. Further, the physical channel transmitted by the terminal is PUSCH. Also, the mapping type of the physical data channel transmitted by the terminal is set via UL-DMRS-config-type transmitted in the RRC signal. Specifically, the mapping type of the physical data channel is divided into type A and type B. Type A indicates that the position of the first DMRS is fixed within the slot. Also, 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 as 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 as 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 UL transmission. The terminal performs UL transmission using either CP-OFDM or DFT-S-OFDM. The base station uses the RRC signal to determine whether the terminal uses either CP-OFDM or DFT-S-OFDM. If the mapping type of the physical data channel is type B, the terminal determines that the index of the reference OFDM symbol is 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 that the index of the reference OFDM symbol is the index of the OFDM symbol next to the OFDM symbol where the first DMRS is located. This is because the DFT-S-OFDM symbols used for UL DMRS may not be available for UL transmission of the physical data channel. 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 that the index of the reference OFDM symbol is the index of the OFDM symbol where the first DMRS is located.

[0258] In still other specific embodiments, the terminal determines the index of the reference OFDM symbol based on a semi-statically configured symbol configuration. Specifically, the terminal determines the index of the reference OFDM symbol as the index of the next unknown symbol immediately following the DL symbol in the slot scheduled for the physical data channel of the terminal. In still other specific embodiments, the terminal determines the index of the reference OFDM symbol as the value obtained by adding the number of gap symbols to the index of the next unknown symbol immediately following the DL symbol in the slot scheduled for the physical data channel of the terminal. The number of gap symbols is determined based on the TA (timing advance) value and the length of the OFDM symbol. In still other specific embodiments, the number of gap symbols is set by the base station. Also, if a DL data channel is scheduled for the unknown symbol, the terminal regards the unknown symbol as a DL symbol. Also, if a UL data channel is scheduled for the unknown symbol, the terminal regards the unknown symbol as a UL symbol.

[0259] Also, when the DCI schedules the transmission of the terminal's physical data channel, 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 terminal's physical data channel is scheduled are located in different slots. Specifically, the terminal determines the last OFDM symbol of the time-frequency resource for which the transmission of the terminal's physical data channel is scheduled as the last OFDM symbol or the symbol before the last OFDM symbol of the slot in which the start OFDM symbol of the time-frequency resource for which the transmission of the terminal's physical data channel is scheduled is located. For example, if the number of OFDM symbols included in a slot is 14 and the DCI indicates that the last OFDM symbol of the time-frequency resource for which the transmission of the terminal's physical data channel is scheduled is the 7th OFDM symbol. At this time, if the number of OFDM symbols occupied by the time-frequency resource for which the transmission of the terminal's physical data channel is scheduled as indicated by the DCI is 7, the terminal determines that the OFDM symbols for which the transmission of the terminal's physical data channel is scheduled are from the 7th OFDM symbol to the 14th OFDM symbol. In the above-described embodiment, the physical data channel transmitted by the terminal is the PUSCH.

[0260] In the above-described embodiment, the physical data channel includes the PDSCH or the PUSCH. Also, the physical control channel includes the PDCCH or the PUCCH. Also, in the embodiment described by taking the PUSCH, PDCCH, PUCCH, and PDCCH as examples, other types of data channels and control channels may be applied.

[0261] The method and system of the present invention have been described with respect to specific embodiments, but some or all of their components or operations are implemented using a computing system having a general-purpose hardware architecture.

[0262] The above description of the present invention is for illustrative purposes, and those with ordinary knowledge in the technical field to which the present invention pertains should be able to understand that it can be easily changed to other specific forms without changing the technical idea and essential features of the present invention. Therefore, the above-described embodiments are illustrative in all respects and should be understood as being restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

[0263] The scope of the present invention is indicated by the claims described below rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Description of Reference Numerals

[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 Unit 210 Processor 221 Cellular Communication Interface Card (First Frequency Band) 222 Cellular Communication Interface Card (Second Frequency Band) 223 Wireless LAN Interface Card (Second Frequency Band) 230 Memory

Claims

1. In a terminal of a wireless communication system, a communication module, and a processor for controlling the communication module, comprising: The processor: receives an RRC (radio resource control) signal from a base station of the wireless communication system via the communication module, and determines time-frequency resources 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, and determines a time-frequency resource region in which reception of a physical data channel of the terminal is scheduled by the physical control channel; receives a physical data channel based on time-frequency resources in which reception of the physical data channel of the terminal is scheduled and time-frequency resources in which the at least one resource-set overlaps; The resource-set is a set of time-frequency resources A terminal.

2. The overlapping time-frequency resources are divided into a plurality of sub-resource-sets, The processor: obtains a rate matching indicator indicating whether reception of the physical data channel is impossible for each of the plurality of sub-resource-sets from the physical control channel; determines whether reception of the physical data channel is impossible in time-frequency resources corresponding to the sub-resource-set for each sub-resource-set according to the rate matching indicator, and receives the physical data channel The terminal according to claim 1.

3. The sub-resource-set is divided based on a frequency domain without division in a time domain among the overlapping time-frequency resources The terminal according to claim 2.

4. Each of the at least one resource-sets is identified by a different index, The rate matching indicator consists of a plurality of bits, The sub-resource-set indicated by each of the plurality of bits is determined based on the index The terminal according to claim 2.

5. The processor: If the time-frequency resources in which the reception of the physical data channel of the terminal is scheduled and the at least one resource set do not overlap with each other, then regardless of the rate matching indicator, receive the physical data channel in the time-frequency resource region in which the reception of the physical data channel of the terminal is scheduled. The terminal according to claim 2.

6. The physical control channel is received in the first slot. The processor If the time-frequency resources in which the physical data channel is scheduled and the at least one resource set overlap in the second slot in which the physical data channel is received, then from the time-frequency resources in which the physical data channel is scheduled in the second slot, perform rate matching for receiving the physical data channel with the time-frequency resources obtained by removing the time-frequency resources in which the time-frequency resources in which the physical data channel is scheduled and the at least one resource set overlap. The first slot and the second slot are different slots from each other. The terminal according to claim 1.

7. In a terminal of a wireless communication system, a communication module, a processor for controlling the communication module, and includes The processor receives a physical control channel, If the reception of the physical data channel of the terminal is scheduled in a plurality of slots by the physical control channel, then receive the physical data channel based on the positions of the same OFDM (orthogonal frequency division multiplexing) symbols in all the slots in which the physical data channel is transmitted. Terminal.

8. The physical control channel is transmitted in the first slot. The processor receives an RRC signal from a base station of the wireless communication system via the communication module, and determines the time-frequency resources corresponding to at least one resource set indicated by the RRC signal. If the time - frequency resources for scheduling the physical data channel in the second slot included in the plurality of slots overlap with the at least one resource - set, rate matching is performed for receiving the physical data channel with the time - frequency resources obtained by removing the time - frequency resources where the time - frequency resources for scheduling the physical data channel in the second slot overlap with the at least one resource - set from the time - frequency resources for scheduling the physical data channel in the second slot. The first slot and the second slot are different slots from each other. The terminal according to claim 7.

9. In each of the plurality of slots, the positions of the time - frequency resources corresponding to the resource - sets where reception of the physical data channel is impossible are the same. Rate matching is performed for receiving the physical data channel with the time - frequency resources obtained by removing the time - frequency resources corresponding to the positions from the time - frequency resources corresponding to the physical data channel scheduled in each slot. The terminal according to claim 7.

10. The OFDM symbol position is indicated by the physical control channel. The terminal according to claim 7.

11. In a method of operating a terminal in a wireless communication system, receiving an RRC signal from a base station of the wireless communication system via a communication module; determining the 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 the time - frequency resource region for scheduling the reception of the physical data channel of the terminal by the physical control channel; receiving the physical data channel based on the time - frequency resources for scheduling the reception of the physical data channel of the terminal and the time - frequency resources where the at least one resource - set overlaps, wherein the resource - set is a set of time - frequency resources. Operating method.

12. The overlapping time - frequency resources are divided into a plurality of sub - resource - sets. The step of determining the time - frequency resource region for scheduling the reception of the physical data channel of the terminal by the physical control channel is including the step of obtaining, from the physical control channel, a rate matching indicator indicating whether reception of the physical data channel is impossible for each of the plurality of sub-resource-sets; the step of receiving the physical data channel comprises: judging, according to the rate matching indicator, whether reception of the physical data channel is impossible for time-frequency resources corresponding to the sub-resource-set for each sub-resource-set, and the step of receiving the physical data channel; The operation method according to claim 11.

13. Among the overlapping time-frequency resources, the sub-resource-set is divided based on the frequency domain without division in the time domain. The operation method according to claim 12.

14. Each of the at least one resource-set is identified by a different index; the rate matching indicator consists of a plurality of bits; the sub-resource-set indicated by each of the plurality of bits is determined based on the index. The operation method according to claim 12.

15. the step of receiving the physical data channel comprises: if the time-frequency resources for scheduling reception of the physical data channel of the terminal do not overlap with any of the at least one resource-set, receiving the physical data channel in the time-frequency resource region for scheduling reception of the physical data channel of the terminal, regardless of the rate matching indicator; The operation method according to claim 12.

16. the physical control channel is transmitted in a first slot; the step of receiving the physical data channel comprises: if the time-frequency resources for scheduling the physical data channel in a second slot where the physical data channel is transmitted overlap with the at least one resource-set, performing rate matching for receiving the physical data channel in the time-frequency resources obtained by removing, from the time-frequency resources for scheduling the physical data channel in the second slot, the time-frequency resources where the time-frequency resources for scheduling the physical data channel overlap with the at least one resource-set; the first slot and the second slot are different slots. The operation method according to claim 11.

17. In a method for operating a terminal of a wireless communication system, receiving a physical control channel; if reception of a physical data channel of the terminal is scheduled in a plurality of slots by the physical control channel, receiving the physical data channel based on positions of the same OFDM symbol in all slots in which the physical data channel is transmitted. The method of operation.

18. The physical control channel is transmitted in a first slot, The method of operation further includes: receiving an RRC signal from a base station of the wireless communication system via a communication module, and determining time-frequency resources corresponding to at least one resource set indicated by the RRC signal; The step of receiving the physical data channel includes: if time-frequency resources in which the physical data channel is scheduled in a second slot included in the plurality of slots overlap with the time-frequency resources of the at least one resource set, from the time-frequency resources in which the physical data channel is scheduled in the second slot, performing rate matching for receiving the physical data channel with the time-frequency resources obtained by removing the time-frequency resources in which the time-frequency resources in which the physical data channel is scheduled in the second slot and the at least one resource set overlap; The first slot and the second slot are different slots from each other. The method of operation according to claim 17.

19. In each of the plurality of slots, positions of time-frequency resources corresponding to a resource set in which reception of the physical data channel is impossible are the same, The step of receiving the physical data channel includes: performing rate matching for receiving the physical data channel with the time-frequency resources obtained by removing 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. The method of operation according to claim 17.

20. The OFDM symbol position is indicated by the physical control channel. The method of operation according to claim 17.

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